Adding upstream version 5.20230130+deb12u1.upstream/5.20230130+deb12u1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

225 files changed, 15090 insertions, 0 deletions

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000..842c1ce
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,14 @@
+default:
+  image: debian:unstable
+
+tests:
+  before_script:
+  - apt-get update
+  - apt-get -y install --no-install-recommends build-essential debhelper fakeroot flit libjs-jquery python3-all python3-all-dbg python3-all-dev python3-build python3-installer python3-nose2 python3-poetry-core python3-pytest python3-setuptools python3-tomli tox
+
+  script:
+  - make tests
+  - echo -e '#!/bin/sh\nset -eu\nmake "$@"' > debian/tests/run-installed
+  - export DH_PYTHON_DIST=$PWD/pydist
+  - ./debian/tests/dh-python
+  - ./debian/tests/pybuild
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..f660604
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,62 @@
+#!/usr/bin/make -f
+INSTALL ?= install
+PREFIX ?= /usr/local
+MANPAGES ?= pybuild.1 pybuild-autopkgtest.1 dh_python3.1
+DVERSION=$(shell dpkg-parsechangelog | sed -rne 's,^Version: (.+),\1,p' || echo 'DEVEL')
+VERSION=$(shell dpkg-parsechangelog | sed -rne 's,^Version: ([^-]+).*,\1,p' || echo 'DEVEL')
+
+clean:
+	make -C tests clean
+	make -C pydist clean
+	find . -name '*.py[co]' -delete
+	find . -name __pycache__ -type d | xargs rm -rf
+	rm -f .coverage $(MANPAGES)
+	rm -rf .pybuild
+
+dist:
+	git archive --format=tar --prefix=dh-python-$(VERSION)/ HEAD \
+	| xz -9 -c >../dh-python_$(VERSION).orig.tar.xz
+
+install:
+	$(INSTALL) -m 755 -d $(DESTDIR)$(PREFIX)/bin \
+		$(DESTDIR)$(PREFIX)/share/debhelper/autoscripts/ \
+		$(DESTDIR)$(PREFIX)/share/perl5/Debian/Debhelper/Sequence/ \
+		$(DESTDIR)$(PREFIX)/share/perl5/Debian/Debhelper/Buildsystem/ \
+		$(DESTDIR)$(PREFIX)/share/dh-python/dhpython/build \
+		$(DESTDIR)$(PREFIX)/share/dh-python/dist
+	$(INSTALL) -m 644 pydist/*_fallback $(DESTDIR)$(PREFIX)/share/dh-python/dist/
+	$(INSTALL) -m 644 dhpython/*.py $(DESTDIR)$(PREFIX)/share/dh-python/dhpython/
+	$(INSTALL) -m 644 dhpython/build/*.py $(DESTDIR)$(PREFIX)/share/dh-python/dhpython/build/
+	$(INSTALL) -m 755 pybuild $(DESTDIR)$(PREFIX)/share/dh-python/
+	$(INSTALL) -m 755 pybuild-autopkgtest $(DESTDIR)$(PREFIX)/share/dh-python/
+	$(INSTALL) -m 755 dh_python3 $(DESTDIR)$(PREFIX)/share/dh-python/
+	sed -i -e 's/DEVELV/$(DVERSION)/' $(DESTDIR)$(PREFIX)/share/dh-python/pybuild
+	sed -i -e 's/DEVELV/$(DVERSION)/' $(DESTDIR)$(PREFIX)/share/dh-python/dh_python3
+	
+	$(INSTALL) -m 644 dh/pybuild.pm $(DESTDIR)$(PREFIX)/share/perl5/Debian/Debhelper/Buildsystem/
+	$(INSTALL) -m 644 dh/python3.pm $(DESTDIR)$(PREFIX)/share/perl5/Debian/Debhelper/Sequence/
+	$(INSTALL) -m 644 autoscripts/* $(DESTDIR)$(PREFIX)/share/debhelper/autoscripts/
+
+%.1: %.rst
+	rst2man $< > $@
+
+%.htm: %.rst
+	rst2html $< > $@
+
+manpages: $(MANPAGES)
+
+dist_fallback:
+	make -C pydist $@
+
+# TESTS
+nose:
+	#nosetests3 --verbose --with-doctest --with-coverage
+	nose2-3 --verbose --plugin nose2.plugins.doctests --with-doctest
+
+tests: nose
+	make -C tests
+
+test%:
+	make -C tests $@
+
+.PHONY: clean tests test% check_versions
diff --git a/README.rst b/README.rst
new file mode 100644
index 0000000..0195c1b
--- /dev/null
+++ b/README.rst
@@ -0,0 +1,175 @@
+===========
+ dh-python
+===========
+
+``dh-python`` provides various tools that help packaging Python related files
+in Debian.
+
+* ``pybuild`` is a tool that implements ``dh`` sequencer's ``dh_auto_foo``
+  commands (but it can be used outside ``dh`` as well). It builds and installs
+  files.
+
+* ``dh_python3`` is a tool that takes what ``pybuild`` produces and
+  generates runtime dependencies and maintainer scripts.
+  It fixes some common mistakes, like installing files into
+  ``site-packages`` instead of ``dist-packages``, ``/usr/local/bin/`` 
+  shebangs, removes ``.py`` files from ``-dbg`` packages, etc.)
+
+  To translate ``requires.txt`` (a file installed in
+  ``dist-packages/foo.egg-info/``) into Debian dependencies, a list of
+  packages that provide given egg distribution is used. If the dependency
+  is not found there, ``dpkg -S`` is used (i.e. a given dependency has to be
+  installed; you need it in ``Build-Depends`` in order to run tests anyway).
+  See *dependencies* section in ``dh_python3``'s manpage for more details.
+
+  * ``dh_python3`` works on ``./debian/python3-foo/`` files and other binary
+    packages that have ``${python3:Depends}`` in the ``Depends`` field.
+    It ignores Python 2.X and PyPy2 specific directories.
+    See ``dh_python3`` manpage for more details.
+
+How it works
+============
+
+A simplified work flow looks like this:
+
+.. code:: python
+
+    # dh_auto_clean stage
+    for interpreter in REQUESTED_INTERPRETERS:
+        for version in interpreter.REQUESTED_VERSIONS:
+            PYBUILD_BEFORE_CLEAN
+            pybuild --clean
+            PYBUILD_AFTER_CLEAN
+
+    plenty_of_other_dh_foo_tools_invoked_here
+
+    # dh_auto_configure stage
+    for interpreter in REQUESTED_INTERPRETERS:
+        for version in interpreter.REQUESTED_VERSIONS:
+            PYBUILD_BEFORE_CONFIGURE
+            pybuild --configure
+            PYBUILD_AFTER_CONFIGURE
+
+    plenty_of_other_dh_foo_tools_invoked_here
+
+    # dh_auto_build stage
+    for interpreter in REQUESTED_INTERPRETERS:
+        for version in interpreter.REQUESTED_VERSIONS:
+            PYBUILD_BEFORE_BUILD
+            pybuild --build
+            PYBUILD_AFTER_BUILD
+
+    plenty_of_other_dh_foo_tools_invoked_here
+
+    # dh_auto_test stage
+    for interpreter in REQUESTED_INTERPRETERS:
+        for version in interpreter.REQUESTED_VERSIONS:
+            PYBUILD_BEFORE_TEST
+            pybuild --test
+            PYBUILD_AFTER_TEST
+
+    plenty_of_other_dh_foo_tools_invoked_here
+
+    # dh_auto_install stage
+    for interpreter in REQUESTED_INTERPRETERS:
+        for version in interpreter.REQUESTED_VERSIONS:
+            PYBUILD_BEFORE_INSTALL
+            pybuild --install
+            PYBUILD_AFTER_INSTALL
+
+    plenty_of_other_dh_foo_tools_invoked_here
+
+    dh_python3
+
+    plenty_of_other_dh_foo_tools_invoked_here
+
+
+pybuild --$step
+---------------
+
+This command is auto-detected, it currently supports distutils, autotools,
+cmake and a custom build system where you can define your own set of
+commands. Why do we need it? ``dh_auto_foo`` doesn't know each command has to
+be invoked for each interpreter and version.
+
+
+REQUESTED_INTERPRETERS
+----------------------
+
+is parsed from ``Build-Depends`` if ``--buildsystem=pybuild`` is set.  If it's
+not, you have to pass ``--interpreter`` to ``pybuild`` (more in its manpage)
+
+* ``python3-all{,-dev}`` - all CPython interpreters (for packages that
+  provide public modules / extensions)
+* ``python3-all-dbg`` - all CPython debug interpreters (if ``-dbg`` package
+  is provided)
+* ``python3`` - default CPython or closest to default interpreter only (use
+  this if you build a Python application)
+* ``python3-dbg`` - default CPython debug (or closest to the default one)
+  only
+
+REQUESTED_VERSIONS
+------------------
+
+is parsed from ``X-Python3-Version`` and ``Build-Depends``.
+
+
+BEFORE and AFTER commands
+-------------------------
+
+can be different for each interpreter and/or version, examples:
+
+* ``PYBUILD_AFTER_BUILD_python3.5=rm {destdir}/{build_dir}/foo/bar2X.py``
+* ``PYBUILD_BEFORE_INSTALL_python3=touch {destdir}/{install_dir}/foo/bar/__init__.py``
+
+These commands should be used only if overriding ``dh_auto_foo`` is not enough
+(example below)
+
+.. code::
+
+  override_dh_auto_install:
+        before_auto_install_commands
+        dh_auto_install
+        after_auto_install_commands
+
+See the ``pybuild`` manpage for more details (search for ``BUILD SYSTEM ARGUMENTS``)
+
+
+overrides
+---------
+
+How to override ``pybuild`` autodetected options:
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+
+* Each ``pybuild`` call can be disabled (for given interpreter, version or
+  stage). See the ``pybuild`` manpage for more details (search for
+  ``--disable`` description).
+* You can pass options in ``override_dh_auto_foo`` via command line options:
+
+  .. code::
+
+   dh_auto_test -- --system=custom --test-args='{interpreter} setup.py test'
+
+  or env. variables:
+
+  .. code::
+
+   PYBUILD_SYSTEM=custom PYBUILD_TEST_ARGS='{interpreter} setup.py test' dh_auto_test
+
+* You can export env. variables globally at the beginning of debian/rules
+
+  .. code::
+
+   export PYBUILD_TEST_ARGS={dir}/tests/
+
+How to override dh_python3 options:
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+ * via command line, f.e.
+   
+.. code::
+
+   override_dh_python3:
+        dh_python3 --shebang=/usr/bin/python3
+
diff --git a/autoscripts/postinst-py3compile b/autoscripts/postinst-py3compile
new file mode 100644
index 0000000..2af81b0
--- /dev/null
+++ b/autoscripts/postinst-py3compile
@@ -0,0 +1,6 @@
+if command -v py3compile >/dev/null 2>&1; then
+	py3compile -p #PACKAGE# #ARGS#
+fi
+if command -v pypy3compile >/dev/null 2>&1; then
+	pypy3compile -p #PACKAGE# #ARGS# || true
+fi
diff --git a/autoscripts/postinst-pycompile b/autoscripts/postinst-pycompile
new file mode 100644
index 0000000..f479f84
--- /dev/null
+++ b/autoscripts/postinst-pycompile
@@ -0,0 +1,3 @@
+if command -v pycompile >/dev/null 2>&1; then
+	pycompile -p #PACKAGE# #ARGS#
+fi
diff --git a/autoscripts/postinst-pypycompile b/autoscripts/postinst-pypycompile
new file mode 100644
index 0000000..b26c45f
--- /dev/null
+++ b/autoscripts/postinst-pypycompile
@@ -0,0 +1,5 @@
+if command -v pypycompile >/dev/null 2>&1; then
+	pypycompile -p #PACKAGE# #ARGS#
+elif pypy -m py_compile >/dev/null 2>&1; then
+	dpkg -L #PACKAGE# | grep '\.py$' | pypy -m py_compile - >/dev/null
+fi
diff --git a/autoscripts/prerm-py3clean b/autoscripts/prerm-py3clean
new file mode 100644
index 0000000..3ec270f
--- /dev/null
+++ b/autoscripts/prerm-py3clean
@@ -0,0 +1,6 @@
+if command -v py3clean >/dev/null 2>&1; then
+	py3clean -p #PACKAGE# #ARGS#
+else
+	dpkg -L #PACKAGE# | sed -En -e '/^(.*)\/(.+)\.py$/s,,rm "\1/__pycache__/\2".*,e'
+	find /usr/lib/python3/dist-packages/ -type d -name __pycache__ -empty -print0 | xargs --null --no-run-if-empty rmdir
+fi
diff --git a/autoscripts/prerm-pyclean b/autoscripts/prerm-pyclean
new file mode 100644
index 0000000..a208c9b
--- /dev/null
+++ b/autoscripts/prerm-pyclean
@@ -0,0 +1,8 @@
+if command -v pyclean >/dev/null 2>&1; then
+	pyclean -p #PACKAGE# #ARGS#
+else
+	dpkg -L #PACKAGE# | grep \.py$ | while read file
+	do
+		rm -f "${file}"[co] >/dev/null
+  	done
+fi
diff --git a/autoscripts/prerm-pypyclean b/autoscripts/prerm-pypyclean
new file mode 100644
index 0000000..8e7b2bc
--- /dev/null
+++ b/autoscripts/prerm-pypyclean
@@ -0,0 +1,6 @@
+if command -v pypyclean >/dev/null 2>&1; then
+	pypyclean -p #PACKAGE# #ARGS#
+else
+	dpkg -L #PACKAGE# | sed -En -e '/^(.*)\/(.+)\.py$/s,,rm "\1/__pycache__/\2".*,e'
+	find /usr/lib/pypy/dist-packages/ -type d -name __pycache__ -empty -print0 | xargs --null --no-run-if-empty rmdir
+fi
diff --git a/dh/pybuild.pm b/dh/pybuild.pm
new file mode 100644
index 0000000..31b52a1
--- /dev/null
+++ b/dh/pybuild.pm
@@ -0,0 +1,226 @@
+# A debhelper build system class for building Python libraries
+#
+# Copyright: © 2012-2013 Piotr Ożarowski
+
+# TODO:
+# * support for dh --parallel
+
+package Debian::Debhelper::Buildsystem::pybuild;
+
+use strict;
+use Dpkg::Control;
+use Dpkg::Changelog::Debian;
+use Debian::Debhelper::Dh_Lib qw(%dh error doit);
+use base 'Debian::Debhelper::Buildsystem';
+
+sub DESCRIPTION {
+	"Python pybuild"
+}
+
+sub check_auto_buildable {
+	my $this=shift;
+	return doit('pybuild', '--detect', '--really-quiet', '--dir', $this->get_sourcedir());
+}
+
+sub new {
+	my $class=shift;
+	my $this=$class->SUPER::new(@_);
+	$this->enforce_in_source_building();
+
+	if (!$ENV{'PYBUILD_INTERPRETERS'}) {
+		if ($ENV{'DEBPYTHON_DEFAULT'}) {
+			$this->{pydef} = $ENV{'DEBPYTHON_DEFAULT'};}
+		else {
+			$this->{pydef} = `pyversions -vd 2>/dev/null`;}
+		$this->{pydef} =~ s/\s+$//;
+		if ($ENV{'DEBPYTHON_SUPPORTED'}) {
+			$this->{pyvers} = $ENV{'DEBPYTHON_SUPPORTED'} =~ s/,/ /r;}
+		else {
+			$this->{pyvers} = `pyversions -vr 2>/dev/null`;}
+		$this->{pyvers} =~ s/\s+$//;
+		if ($ENV{'DEBPYTHON3_DEFAULT'}) {
+			$this->{py3def} = $ENV{'DEBPYTHON3_DEFAULT'};}
+		else {
+			$this->{py3def} = `py3versions -vd 2>/dev/null`;}
+		$this->{py3def} =~ s/\s+$//;
+		if ($ENV{'DEBPYTHON3_SUPPORTED'}) {
+			$this->{py3vers} = $ENV{'DEBPYTHON3_SUPPORTED'} =~ s/,/ /r;}
+		else {
+			$this->{py3vers} = `py3versions -vr 2>/dev/null`;
+			if ($this->{py3vers} eq "") {
+				# We swallowed stderr, above
+				system("py3versions -vr");
+				die('E: py3versions failed');
+			}
+		}
+		$this->{py3vers} =~ s/\s+$//;
+	}
+
+	return $this;
+}
+
+sub configure {
+	my $this=shift;
+	foreach my $command ($this->pybuild_commands('configure', @_)) {
+		doit(@$command);
+	}
+}
+
+sub build {
+	my $this=shift;
+	foreach my $command ($this->pybuild_commands('build', @_)) {
+		doit(@$command);
+	}
+}
+
+sub install {
+	my $this=shift;
+	my $destdir=shift;
+	foreach my $command ($this->pybuild_commands('install', @_)) {
+		doit(@$command, '--dest-dir', $destdir);
+	}
+}
+
+sub test {
+	my $this=shift;
+	foreach my $command ($this->pybuild_commands('test', @_)) {
+		doit(@$command);
+	}
+}
+
+sub clean {
+	my $this=shift;
+	foreach my $command ($this->pybuild_commands('clean', @_)) {
+		doit(@$command);
+	}
+	doit('rm', '-rf', '.pybuild/');
+	doit('find', '.', '-name', '*.pyc', '-exec', 'rm', '{}', ';');
+}
+
+sub pybuild_commands {
+	my $this=shift;
+	my $step=shift;
+	my @options = @_;
+	my @result;
+
+	my $dir = $this->get_sourcedir();
+	if (not grep {$_ eq '--dir'} @options and $dir ne '.') {
+		# if --dir is not passed, PYBUILD_DIR can be used
+		push @options, '--dir', $dir;
+	}
+
+	if (not grep {$_ eq '--verbose'} @options and $dh{QUIET}) {
+		push @options, '--quiet';
+	}
+
+	my @deps;
+	if ($ENV{'PYBUILD_INTERPRETERS'}) {
+		push @result, ['pybuild', "--$step", @options];
+	}
+	else {
+		# get interpreter packages from Build-Depends{,-Indep}:
+		# NOTE: possible problems with alternative/versioned dependencies
+		@deps = $this->python_build_dependencies();
+
+		# When depends on python{3,}-setuptools-scm, set
+		# SETUPTOOLS_SCM_PRETEND_VERSION to upstream version
+		# Without this, setuptools-scm tries to detect current
+		# version from git tag, which fails for debian tags
+		# (debian/<version>) sometimes.
+		if ((grep /python3-(setuptools-scm|hatch-vcs)/, @deps) && !$ENV{'SETUPTOOLS_SCM_PRETEND_VERSION'}) {
+			my $changelog = Dpkg::Changelog::Debian->new(range => {"count" => 1});
+			$changelog->load("debian/changelog");
+			my $version = @{$changelog}[0]->get_version();
+			$version =~ s/-[^-]+$//;  # revision
+			$version =~ s/^\d+://;    # epoch
+			$version =~ s/~/-/;       # ignore tilde versions
+			$ENV{'SETUPTOOLS_SCM_PRETEND_VERSION'} = $version;
+		}
+
+		# When depends on python{3,}-pbr, set PBR_VERSION to upstream version
+		# Without this, python-pbr tries to detect current
+		# version from pkg metadata or git tag, which fails for debian tags
+		# (debian/<version>) sometimes.
+		if ((grep /python3-pbr/, @deps) && !$ENV{'PBR_VERSION'}) {
+			my $changelog = Dpkg::Changelog::Debian->new(range => {"count" => 1});
+			$changelog->load("debian/changelog");
+			my $version = @{$changelog}[0]->get_version();
+			$version =~ s/-[^-]+$//;  # revision
+			$version =~ s/^\d+://;    # epoch
+			$ENV{'PBR_VERSION'} = $version;
+		}
+
+		my @py3opts = ('pybuild', "--$step");
+
+		if (($step eq 'test' or $step eq 'autopkgtest') and
+				$ENV{'PYBUILD_TEST_PYTEST'} ne '1' and
+				$ENV{'PYBUILD_TEST_NOSE2'} ne '1' and
+				$ENV{'PYBUILD_TEST_NOSE'} ne '1' and
+				$ENV{'PYBUILD_TEST_CUSTOM'} ne '1' and
+				$ENV{'PYBUILD_TEST_TOX'} ne '1') {
+			if (grep {$_ eq 'tox'} @deps and $ENV{'PYBUILD_TEST_TOX'} ne '0') {
+				push @py3opts, '--test-tox'}
+			elsif (grep {$_ eq 'python3-pytest'} @deps and $ENV{'PYBUILD_TEST_PYTEST'} ne '0') {
+				push @py3opts, '--test-pytest'}
+			elsif (grep {$_ eq 'python3-nose2'} @deps and $ENV{'PYBUILD_TEST_NOSE2'} ne '0') {
+				push @py3opts, '--test-nose2'}
+			elsif (grep {$_ eq 'python3-nose'} @deps and $ENV{'PYBUILD_TEST_NOSE'} ne '0') {
+				push @py3opts, '--test-nose'}
+		}
+
+		my $py3all = 0;
+		my $py3alldbg = 0;
+
+		my $i = 'python{version}';
+
+		# Python 3
+		if ($this->{py3vers}) {
+			if (grep {$_ eq 'python3-all' or $_ eq 'python3-all-dev'} @deps) {
+				$py3all = 1;
+				push @result, [@py3opts, '-i', $i, '-p', $this->{py3vers}, @options];
+			}
+			if (grep {$_ eq 'python3-all-dbg'} @deps) {
+				$py3alldbg = 1;
+				push @result, [@py3opts, '-i', "$i-dbg", '-p', $this->{py3vers}, @options];
+			}
+		}
+		if ($this->{py3def}) {
+			if (not $py3all and grep {$_ eq 'python3' or $_ eq 'python3-dev'} @deps) {
+				push @result, [@py3opts, '-i', $i, '-p', $this->{py3def}, @options];
+			}
+			if (not $py3alldbg and grep {$_ eq 'python3-dbg'} @deps) {
+				push @result, [@py3opts, '-i', "$i-dbg", '-p', $this->{py3def}, @options];
+			}
+		}
+		# TODO: pythonX.Y → `pybuild -i python{version} -p X.Y`
+
+	}
+	if (!@result) {
+		use Data::Dumper;
+		die('E: Please add appropriate interpreter package to Build-Depends, see pybuild(1) for details.' .
+		    'this: ' . Dumper($this) .
+		    'deps: ' . Dumper(\@deps));
+	}
+	return @result;
+}
+
+sub python_build_dependencies {
+	my $this=shift;
+
+	my @result;
+	my $c = Dpkg::Control->new(type => CTRL_INFO_SRC);
+	if ($c->load('debian/control')) {
+		for my $field (grep /^Build-Depends/, keys %{$c}) {
+			my $builddeps = $c->{$field};
+			while ($builddeps =~ /(?:^|[\s,])((pypy|python|tox)[0-9\.]*(-[^\s,\(]+)?)(?:[\s,\(]|$)/g) {
+				my $dep = $1;
+				$dep =~ s/:(any|native)$//;
+				if ($dep) {push @result, $dep};
+			}
+		}
+	}
+
+	return @result;
+}
+
+1
diff --git a/dh/python3.pm b/dh/python3.pm
new file mode 100644
index 0000000..103ee2d
--- /dev/null
+++ b/dh/python3.pm
@@ -0,0 +1,10 @@
+#! /usr/bin/perl
+# debhelper sequence file for dh_python3
+
+use warnings;
+use strict;
+use Debian::Debhelper::Dh_Lib;
+
+insert_before("dh_installinit", "dh_python3");
+
+1
diff --git a/dh_python3 b/dh_python3
new file mode 100755
index 0000000..561ade7
--- /dev/null
+++ b/dh_python3
@@ -0,0 +1,292 @@
+#! /usr/bin/python3
+# vim: et ts=4 sw=4
+
+# Copyright © 2010-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import logging
+import os
+import sys
+from argparse import ArgumentParser, SUPPRESS
+from os.path import exists, join
+from shutil import copy as fcopy
+from dhpython.debhelper import DebHelper
+from dhpython.depends import Dependencies
+from dhpython.interpreter import Interpreter, EXTFILE_RE
+from dhpython.version import supported, default, Version, VersionRange
+from dhpython.pydist import validate as validate_pydist
+from dhpython.fs import fix_locations, Scan
+from dhpython.option import compiled_regex
+from dhpython.tools import pyinstall, pyremove
+
+# initialize script
+logging.basicConfig(format='%(levelname).1s: dh_python3 '
+                           '%(module)s:%(lineno)d: %(message)s')
+log = logging.getLogger('dhpython')
+os.umask(0o22)
+DEFAULT = default('cpython3')
+SUPPORTED = supported('cpython3')
+
+
+class Scanner(Scan):
+    def handle_ext(self, fpath):
+        path, fname = fpath.rsplit('/', 1)
+        tagver = EXTFILE_RE.search(fname)
+        if tagver is None:
+            # yeah, python3.1 is not covered, but we don't want to
+            # mess with non-Python libraries, don't we?
+            return
+        tagver = tagver.groupdict()['ver']
+        if tagver is None:
+            return
+        tagver = Version("%s.%s" % (tagver[0], tagver[1:]))
+        return tagver
+
+
+def main():
+    parser = ArgumentParser()
+    parser.add_argument(
+        '--version', action='version', version='%(prog)s DEVELV')
+    parser.add_argument(
+        '--no-guessing-deps', action='store_false', dest='guess_deps',
+        help='disable guessing dependencies')
+    parser.add_argument(
+        '--skip-private', action='store_true',
+        help="don't check private directories")
+    parser.add_argument(
+        '-v', '--verbose', action='store_true',
+        default=os.environ.get('DH_VERBOSE') == '1',
+        help='turn verbose mode on')
+    # arch=False->arch:all only, arch=True->arch:any only, None->all of them
+    parser.add_argument(
+        '-i', '--indep', action='store_false', dest='arch', default=None,
+        help='act on architecture independent packages')
+    parser.add_argument(
+        '-a', '-s', '--arch', action='store_true', dest='arch',
+        help='act on architecture dependent packages')
+    parser.add_argument(
+        '-q', '--quiet', action='store_false', dest='verbose', help='be quiet')
+    parser.add_argument(
+        '-p', '--package', action='append', metavar='PACKAGE',
+        help='act on the package named PACKAGE')
+    parser.add_argument(
+        '-N', '--no-package', action='append', metavar='PACKAGE',
+        help='do not act on the specified package')
+    parser.add_argument(
+        '--remaining-packages', action='store_true',
+        help='Do not act on the packages which have already been acted on by '
+             'this debhelper command earlier')
+    parser.add_argument(
+        '--compile-all', action='store_true',
+        help='compile all files from given private directory in postinst, not '
+             'just the ones provided by the package')
+    parser.add_argument(
+        '-V', type=VersionRange, dest='vrange', metavar='[X.Y][-][A.B]',
+        help='specify list of supported Python versions. See py3compile(1) for '
+             'examples')
+    parser.add_argument(
+        '-X', '--exclude', action='append', dest='regexpr', type=compiled_regex,
+        metavar='REGEXPR',
+        help='exclude items that match given REGEXPR. You may use this option '
+             'multiple times to build up a list of things to exclude.')
+    parser.add_argument(
+        '--accept-upstream-versions', action='store_true',
+        help='accept upstream versions while translating Python dependencies '
+             'into Debian ones')
+    parser.add_argument(
+        '--depends', action='append', metavar='REQ',
+        help='translate given requirements into Debian dependencies and add '
+             'them to ${python3:Depends}. Use it for missing items in '
+             'requires.txt.')
+    parser.add_argument(
+        '--depends-section', action='append', metavar='SECTION',
+        help='translate requirements from given section into Debian '
+             'dependencies and add them to ${python3:Depends}')
+    parser.add_argument(
+        '--recommends', action='append', metavar='REQ',
+        help='translate given requirements into Debian dependencies and add '
+             'them to ${python3:Recommends}')
+    parser.add_argument(
+        '--recommends-section', action='append', metavar='SECTION',
+        help='translate requirements from given section into Debian '
+             'dependencies and add them to ${python3:Recommends}')
+    parser.add_argument(
+        '--suggests', action='append', metavar='REQ',
+        help='translate given requirements into Debian dependencies and add '
+             'them to ${python3:Suggests}')
+    parser.add_argument(
+        '--suggests-section', action='append', metavar='SECTION',
+        help='translate requirements from given section into Debian '
+             'dependencies and add them to ${python3:Suggests}')
+    parser.add_argument(
+        '--requires', action='append', metavar='FILE',
+        help='translate requirements from given file into Debian dependencies '
+             'and add them to ${python3:Depends}')
+    parser.add_argument(
+        '--shebang', metavar='COMMAND',
+        help='use given command as shebang in scripts')
+    parser.add_argument(
+        '--ignore-shebangs', action='store_true',
+        help='do not translate shebangs into Debian dependencies')
+    parser.add_argument(
+        '--no-dbg-cleaning', action='store_false', dest='clean_dbg_pkg',
+        help='do not remove files from debug packages')
+    parser.add_argument(
+        '--no-ext-rename', action='store_true',
+        help='do not add magic tags nor multiarch tuples to extension file '
+             'names)')
+    parser.add_argument(
+        '--no-shebang-rewrite', action='store_true',
+        help='do not rewrite shebangs')
+    parser.add_argument('private_dir', nargs='?',
+        help='Private directory containing Python modules (optional)')
+    # debhelper options:
+    parser.add_argument('-O', action='append', help=SUPPRESS)
+
+    options = parser.parse_args(os.environ.get('DH_OPTIONS', '').split()
+                                + sys.argv[1:])
+    if options.O:
+        parser.parse_known_args(options.O, options)
+
+    private_dir = options.private_dir
+    if private_dir:
+        if not private_dir.startswith('/'):
+            # handle usr/share/foo dirs (without leading slash)
+            private_dir = '/' + private_dir
+    # TODO: support more than one private dir at the same time (see :meth:scan)
+    if options.skip_private:
+        private_dir = False
+
+    if options.verbose:
+        log.setLevel(logging.DEBUG)
+        log.debug('version: DEVELV')
+        log.debug('argv: %s', sys.argv)
+        log.debug('options: %s', options)
+        log.debug('supported Python versions: %s (default=%s)',
+                  ','.join(str(v) for v in SUPPORTED), DEFAULT)
+    else:
+        log.setLevel(logging.INFO)
+
+    options.write_log = False
+    if os.environ.get('DH_INTERNAL_OVERRIDE', ''):
+        options.write_log = True
+
+    try:
+        dh = DebHelper(options, impl='cpython3')
+    except Exception as e:
+        log.error('cannot initialize DebHelper: %s', e)
+        exit(2)
+    if not dh.packages:
+        log.error('no package to act on (python3-foo or one with ${python3:Depends} in Depends)')
+        # exit(7)
+    if not options.vrange and dh.python_version:
+        options.vrange = VersionRange(dh.python_version)
+
+    interpreter = Interpreter('python3')
+    for package, pdetails in dh.packages.items():
+        log.debug('processing package %s...', package)
+        interpreter.debug = package.endswith('-dbg')
+
+        if not private_dir:
+            try:
+                pyinstall(interpreter, package, options.vrange)
+            except Exception as err:
+                log.error("%s.pyinstall: %s", package, err)
+                exit(4)
+            try:
+                pyremove(interpreter, package, options.vrange)
+            except Exception as err:
+                log.error("%s.pyremove: %s", package, err)
+                exit(5)
+            fix_locations(package, interpreter, SUPPORTED, options)
+        stats = Scanner(interpreter, package, private_dir, options).result
+
+        dependencies = Dependencies(package, 'cpython3', dh.build_depends)
+        dependencies.parse(stats, options)
+
+        pyclean_added = False  # invoke pyclean only once in maintainer script
+        if stats['compile']:
+            args = ''
+            if options.vrange:
+                args += "-V %s" % options.vrange
+            dh.autoscript(package, 'postinst', 'postinst-py3compile', args)
+            dh.autoscript(package, 'prerm', 'prerm-py3clean', '')
+            pyclean_added = True
+        for pdir, details in sorted(stats['private_dirs'].items()):
+            if not details.get('compile'):
+                continue
+            if not pyclean_added:
+                dh.autoscript(package, 'prerm', 'prerm-py3clean', '')
+                pyclean_added = True
+
+            args = pdir
+
+            ext_for = details.get('ext_vers')
+            ext_no_version = details.get('ext_no_version')
+            if ext_for is None and not ext_no_version:  # no extension
+                shebang_versions = list(i.version for i in details.get('shebangs', [])
+                                        if i.version and i.version.minor)
+                if not options.ignore_shebangs and len(shebang_versions) == 1:
+                    # only one version from shebang
+                    args += " -V %s" % shebang_versions[0]
+                elif options.vrange and options.vrange != (None, None):
+                    args += " -V %s" % options.vrange
+            elif ext_no_version:
+                # at least one extension's version not detected
+                if options.vrange and '-' not in str(options.vrange):
+                    ver = str(options.vrange)
+                else:  # try shebang or default Python version
+                    ver = (list(i.version for i in details.get('shebangs', [])
+                                if i.version and i.version.minor) or [None])[0] or DEFAULT
+                dependencies.depend("python%s" % ver)
+                args += " -V %s" % ver
+            else:
+                extensions = sorted(ext_for)
+                vr = VersionRange(minver=extensions[0], maxver=extensions[-1])
+                args += " -V %s" % vr
+
+            for regex in options.regexpr or []:
+                args += " -X '%s'" % regex.pattern.replace("'", r"'\''")
+
+            dh.autoscript(package, 'postinst', 'postinst-py3compile', args)
+
+        dependencies.export_to(dh)
+
+        pydist_file = join('debian', "%s.pydist" % package)
+        if exists(pydist_file):
+            if not validate_pydist(pydist_file):
+                log.warning("%s.pydist file is invalid", package)
+            else:
+                dstdir = join('debian', package, 'usr/share/python3/dist/')
+                if not exists(dstdir):
+                    os.makedirs(dstdir)
+                fcopy(pydist_file, join(dstdir, package))
+        bcep_file = join('debian', "%s.bcep" % package)
+        if exists(bcep_file):
+            dstdir = join('debian', package, 'usr/share/python3/bcep/')
+            if not exists(dstdir):
+                os.makedirs(dstdir)
+            fcopy(bcep_file, join(dstdir, package))
+
+    dh.save()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/dh_python3.rst b/dh_python3.rst
new file mode 100644
index 0000000..1c69634
--- /dev/null
+++ b/dh_python3.rst
@@ -0,0 +1,238 @@
+============
+ dh_python3
+============
+
+-----------------------------------------------------------------------------------
+calculates Python dependencies, adds maintainer scripts to byte compile files, etc.
+-----------------------------------------------------------------------------------
+
+:Manual section: 1
+:Author: Piotr Ożarowski, 2012-2013
+
+SYNOPSIS
+========
+  dh_python3 -p PACKAGE [-V [X.Y][-][A.B]] DIR [-X REGEXPR]
+
+DESCRIPTION
+===========
+
+QUICK GUIDE FOR MAINTAINERS
+---------------------------
+
+ * build depend on dh-python
+ * build-depend on python3 (Python application) or python3-all (Python module)
+   or python3-all-dev (Python extension),
+ * if necessary, describe supported Python 3 versions via X-Python3-Version field
+   in debian/control,
+ * build module/application using its standard build system (pybuild wrapper
+   recommended, see pybuild.1 for more details), remember to build extensions
+   for all supported Python 3 versions (loop over ``py3versions -vr``),
+ * install files to the *standard* locations, add `--install-layout=deb` to
+   setup.py's install command if your package is using distutils,
+ * add `python3` to dh's --with option, or:
+ * `include /usr/share/cdbs/1/class/python-distutils.mk` in debian/rules and
+   depend on `cdbs (>= 0.4.90)`, or:
+ * call ``dh_python3`` in the `binary-*` target,
+ * add `${python3:Depends}` to Depends
+
+NOTES
+-----
+
+dependencies
+~~~~~~~~~~~~
+dh_python3 tries to translate Python dependencies from `Requires-Dist`
+entries in `dist-info` or `requires.txt` contents in `egg-info` to
+Debian dependencies.
+In many cases, this works without any additional configuration because
+dh_python3 comes with a build-in mapping of Python module names to
+Debian packages that is periodically regenerated from the Debian
+archive. By default, the version information in the Python dependencies is
+discarded. If you want dh_python3 to generate more strict dependencies (e.g. to
+avoid ABI problems), or if the automatic mapping does not work correctly for
+your package, you have to provide dh_python3 with additional rules for the
+translation of Python module to Debian package dependencies.
+
+For a package *python3-foo* that depends on a package *python3-bar*, there are
+two files that may provide such rules:
+
+#. If the *python3-foo* source package ships with a
+   `debian/py3dist-overrides` file, this file is used by dh_python3
+   during the build of *python3-foo*.
+
+#. If the *python3-bar* source package ships with a
+   `debian/python3-bar.pydist` file (and uses dh_python3), this file
+   will be included in the binary package as
+   `/usr/share/dh-python/dist/cpython3/python3-bar`. During the build
+   of *python3-foo*, dh_python3 will then find and use the file.
+
+Both files have the same format described in
+`/usr/share/doc/dh-python/README.PyDist`. If all you want is to generate
+versioned dependencies (and assuming that the *python3-bar* package provides
+the *pybar* Python module), in most cases it will be sufficient to put the line
+``pybar python3-bar; PEP386`` into either of the above files.
+
+private dirs
+~~~~~~~~~~~~
+`/usr/share/foo`, `/usr/share/games/foo`, `/usr/lib/foo` and
+`/usr/lib/games/foo` private directories are scanned for Python files
+by default (where `foo` is binary package name). If your package ships
+Python files in some other directory, add another dh_python3 call in
+debian/rules with directory name as an argument - you can use different set of
+options in this call. If you need to change options (f.e. a list of supported
+Python 3 versions) for a private directory that is checked by default, invoke
+dh_python3 with --skip-private option and add another call with a path to this
+directory and new options.
+
+debug packages
+~~~~~~~~~~~~~~
+In binary packages which name ends with `-dbg`, all files in
+`/usr/lib/python3/dist-packages/` directory 
+that have extensions different than `so` or `h` are removed by default.
+Use --no-dbg-cleaning option to disable this feature.
+
+pyinstall files
+~~~~~~~~~~~~~~~
+Files listed in debian/pkg.pyinstall file will be installed as public modules
+(i.e. into .../dist-packages/ directory) for all requested Python versions.
+
+Syntax: ``path/to/file [NAMESPACE] [VERSION_RANGE]``
+
+debian directory is automatically removed from the path, so you can place your
+files in debian/ directory and install them from this location (if you want to
+install them in "debian" namespace, set NAMESPACE to debian). If NAMESPACE is
+set, all listed files will be installed in .../dist-packages/NAMESPACE/
+directory.
+
+Examples:
+ * ``foo.py`` installs .../dist-packages/foo.py for all supported Python versions
+ * ``foo/bar.py 3.3-`` installs .../dist-packages/foo/bar.py for versions >= 3.3
+ * ``foo/bar.py spam`` installs .../dist-packages/spam/bar.py
+ * ``debian/*.py spam.egg 3.2`` installs .../python3.2/dist-packages/spam/egg/\*.py
+   files
+
+pyremove files
+~~~~~~~~~~~~~~
+If you want to remove some public modules (i.e. files in .../dist-packages/
+directory) installed by build system (from all supported Python versions or
+only from a subset of these versions), add them to debian/pkg.pyremove file.
+
+Examples:
+ * ``*.pth`` removes .pth files from .../dist-packages/
+ * ``bar/baz.py 3.2`` removes .../python3.2/dist-packages/bar/baz.py
+
+bcep files
+~~~~~~~~~~
+Byte-compilation exception patterns can be described in these files. Use it if
+you want py3compile to skip specific files. This is the only way to skip .py
+files in …/dist-packages/ directory (as `--exclude` passed to py3compile in
+postinst is not used in rtupdate scripts and thus this option cannot be used
+for non-private modules).
+
+``re|-3.6|/usr/lib/python3/dist-packages/jinja2|.*/async(foo|bar).py``
+will skip byte-compilation of `asyncfoo.py` and `asyncbar.py` in
+`/usr/lib/python3/dist-packages/jinja2/` directory for each interpreter that
+doesn't support `async` keyword (introduced in Python 3.6).
+
+If you want to skip byte-compilation in a subdirectory for all interpreters, use:
+``dir|-4.0|/usr/lib/python3/dist-packages/foo/tests/``.
+VERSION_RANGE (`-4.0` in the example) is described in `README.PyDist` file.
+
+`debian/python3-foo.bcep` file from source package will be included in the
+binary package as `/usr/share/python3/bcep/python3-foo.bcep`
+
+overriding supported / default Python versions
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+If you want to override system's list of supported Python versions or the
+default one (f.e. to build a package that includes symlinks for older version
+of Python or compile .py files only for given interpreter version), you can do
+that via `DEBPYTHON3_SUPPORTED` and/or `DEBPYTHON3_DEFAULT` env. variables.
+
+Example: ``3.2,3.3`` limits the list of supported Python versions to Python 3.2
+and Python 3.3.
+
+
+OPTIONS
+=======
+--version	show program's version number and exit
+
+-h, --help	show help message and exit
+
+--no-guessing-deps	disable guessing dependencies
+
+--no-dbg-cleaning	do not remove any files from debug packages
+
+--no-ext-rename		do not add magic tags nor multiarch tuples to extension file names
+
+--no-shebang-rewrite	do not rewrite shebangs
+
+--skip-private	don't check private directories
+
+-v, --verbose	turn verbose mode on
+
+-i, --indep	act on architecture independent packages
+
+-a, --arch	act on architecture dependent packages
+
+-q, --quiet	be quiet
+
+-p PACKAGE, --package=PACKAGE	act on the package named PACKAGE
+
+-N NO_PACKAGE, --no-package=NO_PACKAGE	do not act on the specified package
+
+--remaining-packages	Do not act on the packages which have already
+  been acted on by this command earlier in the same override.
+
+-V VERSION_RANGE	specify list of supported Python 3 versions. See
+  py3compile(1) for examples
+
+-X REGEXPR, --exclude=REGEXPR	exclude items that match given REGEXPR. You may
+  use this option multiple times to build up a list of things to exclude from
+  byte-compilation in private dirs. See also `bcep files`.
+
+--compile-all	compile all files from given private directory in postinst/rtupdate
+  not just the ones provided by the package (i.e. do not pass the --package
+  parameter to py3compile/py3clean)
+
+--accept-upstream-versions	accept upstream versions while translating
+  Python dependencies into Debian ones
+
+--depends=DEPENDS	translate given requirements into Debian dependencies
+  and add them to ${python3:Depends}. Use it for missing items in
+  `requires.txt` / `Requires-Dist`.
+
+--depends-section=SECTION	translate requirements from given extra
+  sections of `requres.txt` / `Requires-Dist` into Debian dependencies
+  and add them to ${python3:Depends}. May be repeated for multiple
+  sections.
+
+--recommends=RECOMMENDS		translate given requirements into Debian dependencies
+  and add them to ${python3:Recommends}
+
+--recommends-section=SECTION	translate requirements from given extra
+  sections of `requires.txt` / `Requires-Dist` into Debian dependencies
+  and add them to ${python3:Recommends}. May be repeated for multiple
+  sections.
+
+--suggests=SUGGESTS	translate given requirements into Debian dependencies
+  and add them to ${python3:Suggests}
+
+--suggests-section=SECTION	translate requirements from given extra
+  sections of `requires.txt` / `Requires-Dist` into Debian dependencies
+  and add them to ${python3:Suggests}. May be repeated for multiple
+  sections.
+
+--requires=FILENAME	translate requirements from given file(s) into Debian
+  dependencies and add them to ${python3:Depends}
+
+--shebang=COMMAND	use given command as shebang in scripts
+
+--ignore-shebangs	do not translate shebangs into Debian dependencies
+
+SEE ALSO
+========
+* /usr/share/doc/python3/python-policy.txt.gz
+* /usr/share/doc/dh-python/README.PyDist
+* pybuild(1)
+* py3compile(1), py3clean(1)
+* pycompile(1), pyclean(1)
+* http://deb.li/dhp3 - most recent version of this document
diff --git a/dhpython/__init__.py b/dhpython/__init__.py
new file mode 100644
index 0000000..338eb17
--- /dev/null
+++ b/dhpython/__init__.py
@@ -0,0 +1,113 @@
+# Copyright © 2010-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import re
+
+PKG_PREFIX_MAP = {'cpython2': 'python',
+                  'cpython3': 'python3',
+                  'pypy': 'pypy'}
+
+# minimum version required for compile/clean scripts:
+MINPYCDEP = {'cpython2': 'python2:any',
+             'cpython3': 'python3:any',
+             'pypy': 'pypy'}
+
+PUBLIC_DIR_RE = {
+    'cpython2': re.compile(r'.*?/usr/lib/python(2\.\d)(?:/|$)'),
+    'cpython3': re.compile(r'.*?/usr/lib/python(3(?:\.\d+)?)(?:/|$)'),
+    'pypy': re.compile(r'.*?/usr/lib/pypy(?:/|$)')}
+
+INTERPRETER_DIR_TPLS = {
+    'cpython2': r'.*/python2\.\d/',
+    'cpython3': r'.*/python3(?:\.\d+)?/',
+    'pypy': r'.*/pypy/'}
+
+MULTIARCH_DIR_TPL = re.compile(
+    '.*/([a-z][^/-]+-(?:linux|kfreebsd|gnu)(?:-[^/-]+)?)(?:/.*|$)')
+
+# Interpreter site-directories
+OLD_SITE_DIRS = {
+    'cpython2': [
+        '/usr/local/lib/python{}/site-packages',
+        '/usr/local/lib/python{}/dist-packages',
+        '/var/lib/python-support/python{}',
+        '/usr/lib/pymodules/python{}',
+        lambda version: '/usr/lib/python{}/site-packages'.format(version)
+                        if version >= '2.6' else None],
+    'cpython3': [
+        '/usr/local/lib/python{}/site-packages',
+        '/usr/local/lib/python{}/dist-packages',
+        '/usr/lib/python{}/site-packages',
+        '/usr/lib/python{}/dist-packages',
+        '/var/lib/python-support/python{}',
+        '/usr/lib/pymodules/python{}'],
+    'pypy': [
+        '/usr/local/lib/pypy/site-packages',
+        '/usr/local/lib/pypy/dist-packages',
+        '/usr/lib/pypy/site-packages']}
+
+# PyDist related
+PYDIST_DIRS = {
+    'cpython2': '/usr/share/python/dist/',
+    'cpython3': '/usr/share/python3/dist/',
+    'pypy': '/usr/share/pypy/dist/'}
+
+PYDIST_OVERRIDES_FNAMES = {
+    'cpython2': 'debian/pydist-overrides',
+    'cpython3': 'debian/py3dist-overrides',
+    'pypy': 'debian/pypydist-overrides'}
+
+PYDIST_DPKG_SEARCH_TPLS = {
+    # implementation: (dpkg -S query, regex filter)
+    'cpython2': ('*/{}-?*.*-info',
+                 r'/(python2\..|pyshared)/.*.(egg|dist)-info$'),
+    'cpython3': ('*python3/*/{}-?*.*-info', r'.(egg|dist)-info$'),
+    'pypy': ('*/pypy/dist-packages/{}-?*.*-info', r'.(egg|dist)-info$'),
+}
+
+# DebHelper related
+DEPENDS_SUBSTVARS = {
+    'cpython2': '${python:Depends}',
+    'cpython3': '${python3:Depends}',
+    'pypy': '${pypy:Depends}',
+}
+PKG_NAME_TPLS = {
+    'cpython2': ('python-', 'python2.'),
+    'cpython3': ('python3-', 'python3.'),
+    'pypy': ('pypy-',)
+}
+RT_LOCATIONS = {
+    'cpython2': '/usr/share/python/runtime.d/',
+    'cpython3': '/usr/share/python3/runtime.d/',
+    'pypy': '/usr/share/pypy/runtime.d/',
+}
+RT_TPLS = {
+    'cpython2': '''
+if [ "$1" = rtupdate ]; then
+\tpyclean {pkg_arg} {dname}
+\tpycompile {pkg_arg} {args} {dname}
+fi''',
+    'cpython3': '''
+if [ "$1" = rtupdate ]; then
+\tpy3clean {pkg_arg} {dname}
+\tpy3compile {pkg_arg} {args} {dname}
+fi''',
+    'pypy': ''
+}
diff --git a/dhpython/_defaults.py b/dhpython/_defaults.py
new file mode 100755
index 0000000..cf7537b
--- /dev/null
+++ b/dhpython/_defaults.py
@@ -0,0 +1,99 @@
+#! /usr/bin/python3
+# Copyright © 2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import logging
+from configparser import ConfigParser
+from os import environ
+from os.path import exists
+from subprocess import Popen, PIPE
+
+SUPPORTED = {
+    'cpython2': [(2, 7)],
+    'cpython3': [(3, 8)],
+    'pypy': [(4, 0)]}
+DEFAULT = {
+    'cpython2': (2, 7),
+    'cpython3': (3, 8),
+    'pypy': (4, 0)}
+
+log = logging.getLogger('dhpython')
+
+
+def cpython_versions(major):
+    result = [None, None]
+    ver = '' if major == 2 else '3'
+    supported = environ.get("DEBPYTHON{}_SUPPORTED".format(ver))
+    default = environ.get("DEBPYTHON{}_DEFAULT".format(ver))
+    if not supported or not default:
+        config = ConfigParser()
+        config.read("/usr/share/python{}/debian_defaults".format(ver))
+        if not default:
+            default = config.get('DEFAULT', 'default-version', fallback='')[6:]
+        if not supported:
+            supported = config.get('DEFAULT', 'supported-versions', fallback='')\
+                .replace('python', '')
+    if default:
+        try:
+            result[0] = tuple(int(i) for i in default.split('.'))
+        except Exception as err:
+            log.warn('invalid debian_defaults file: %s', err)
+    if supported:
+        try:
+            result[1] = tuple(tuple(int(j) for j in i.strip().split('.'))
+                              for i in supported.split(','))
+        except Exception as err:
+            log.warn('invalid debian_defaults file: %s', err)
+    return result
+
+
+def from_file(fpath):
+    if not exists(fpath):
+        raise ValueError("missing interpreter: %s" % fpath)
+    command = "{} --version".format(fpath)
+    with Popen(command, shell=True, stdout=PIPE) as process:
+        stdout, stderr = process.communicate()
+        stdout = str(stdout, 'utf-8')
+
+    print(stdout)
+
+
+cpython2 = cpython_versions(2)
+cpython3 = cpython_versions(3)
+if cpython2[0]:
+    DEFAULT['cpython2'] = cpython2[0]
+if cpython3[0]:
+    DEFAULT['cpython3'] = cpython3[0]
+if cpython2[1]:
+    SUPPORTED['cpython2'] = cpython2[1]
+if cpython3[1]:
+    SUPPORTED['cpython3'] = cpython3[1]
+#from_file('/usr/bin/pypy')
+
+
+if __name__ == '__main__':
+    from sys import argv, stderr
+    if len(argv) != 3:
+        print('invalid number of arguments', file=stderr)
+        exit(1)
+    if argv[1] == 'default':
+        print('.'.join(str(i) for i in DEFAULT[argv[2]]))
+    elif argv[1] == 'supported':
+        print(','.join(('.'.join(str(i) for i in v) for v in SUPPORTED[argv[2]])))
diff --git a/dhpython/build/__init__.py b/dhpython/build/__init__.py
new file mode 100644
index 0000000..d350ccb
--- /dev/null
+++ b/dhpython/build/__init__.py
@@ -0,0 +1,42 @@
+# Copyright © 2012-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import logging
+from glob import glob1
+from os.path import dirname
+
+from dhpython.exceptions import RequiredCommandMissingException
+
+log = logging.getLogger('dhpython')
+
+plugins = {}
+for i in sorted(i[7:-3] for i in glob1(dirname(__file__), 'plugin_*.py')):
+    try:
+        module = __import__("dhpython.build.plugin_%s" % i, fromlist=[i])
+        module.BuildSystem.NAME = i
+        module.BuildSystem.is_usable()
+        plugins[i] = module.BuildSystem
+    except RequiredCommandMissingException as err:
+        log.debug("cannot initialize '%s' plugin: Missing command '%s'", i, err)
+    except Exception as err:
+        if log.level < logging.INFO:
+            log.debug("cannot initialize '%s' plugin", i, exc_info=True)
+        else:
+            log.debug("cannot initialize '%s' plugin: %s", i, err)
diff --git a/dhpython/build/base.py b/dhpython/build/base.py
new file mode 100644
index 0000000..427ef2e
--- /dev/null
+++ b/dhpython/build/base.py
@@ -0,0 +1,293 @@
+# Copyright © 2012-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import logging
+from functools import wraps
+from glob import glob1
+from os import remove, walk
+from os.path import exists, isdir, join
+from subprocess import Popen, PIPE
+from shutil import rmtree, copyfile, copytree
+from dhpython.exceptions import RequiredCommandMissingException
+from dhpython.tools import execute
+try:
+    from shlex import quote
+except ImportError:
+    # shlex.quote is new in Python 3.3
+    def quote(s):
+        if not s:
+            return "''"
+        return "'" + s.replace("'", "'\"'\"'") + "'"
+
+log = logging.getLogger('dhpython')
+
+
+def copy_test_files(dest='{build_dir}',
+                    filelist='{home_dir}/testfiles_to_rm_before_install',
+                    add_to_args=('test', 'tests')):
+
+    def _copy_test_files(func):
+
+        @wraps(func)
+        def __copy_test_files(self, context, args, *oargs, **kwargs):
+            files_to_copy = {'test', 'tests'}
+            # check debian/pybuild_pythonX.Y.testfiles
+            for tpl in ('_{i}{v}', '_{i}{m}', ''):
+                tpl = tpl.format(i=args['interpreter'].name,
+                                 v=args['version'],
+                                 m=args['version'].major)
+                fpath = join(args['dir'], 'debian/pybuild{}.testfiles'.format(tpl))
+                if exists(fpath):
+                    with open(fpath, encoding='utf-8') as fp:
+                        # overwrite files_to_copy if .testfiles file found
+                        files_to_copy = [line.strip() for line in fp.readlines()
+                                         if not line.startswith('#')]
+                        break
+
+            files_to_remove = set()
+            for name in files_to_copy:
+                src_dpath = join(args['dir'], name)
+                dst_dpath = join(dest.format(**args), name.rsplit('/', 1)[-1])
+                if exists(src_dpath):
+                    if not exists(dst_dpath):
+                        if isdir(src_dpath):
+                            copytree(src_dpath, dst_dpath)
+                        else:
+                            copyfile(src_dpath, dst_dpath)
+                        files_to_remove.add(dst_dpath + '\n')
+                    if not args['args'] and 'PYBUILD_TEST_ARGS' not in context['ENV']\
+                       and (self.cfg.test_pytest or self.cfg.test_nose) \
+                       and name in add_to_args:
+                        args['args'] = name
+            if files_to_remove and filelist:
+                with open(filelist.format(**args), 'a') as fp:
+                    fp.writelines(files_to_remove)
+
+            return func(self, context, args, *oargs, **kwargs)
+        return __copy_test_files
+    return _copy_test_files
+
+
+class Base:
+    """Base class for build system plugins
+
+    :attr REQUIRED_COMMANDS: list of command checked by default in :meth:is_usable,
+        if one of them is missing, plugin cannot be used.
+    :type REQUIRED_COMMANDS: list of strings
+    :attr REQUIRED_FILES: list of files (or glob templates) required by given
+        build system
+    :attr OPTIONAL_FILES: dictionary of glob templates (key) and score (value)
+        used to detect if given plugin is the best one for the job
+    :type OPTIONAL_FILES: dict (key is a string, value is an int)
+    :attr SUPPORTED_INTERPRETERS: set of interpreter templates (with or without
+        {version}) supported by given plugin
+    """
+    DESCRIPTION = ''
+    REQUIRED_COMMANDS = []
+    REQUIRED_FILES = []
+    OPTIONAL_FILES = {}
+    SUPPORTED_INTERPRETERS = {'python', 'python3', 'python-dbg', 'python3-dbg',
+                              'python{version}', 'python{version}-dbg'}
+    # files and directories to remove during clean step (other than .pyc):
+    CLEAN_FILES = {'.pytest_cache', '.coverage'}
+
+    def __init__(self, cfg):
+        self.cfg = cfg
+
+    def __repr__(self):
+        return "BuildSystem(%s)" % self.NAME
+
+    @classmethod
+    def is_usable(cls):
+        for command in cls.REQUIRED_COMMANDS:
+            process = Popen(['which', command], stdout=PIPE, stderr=PIPE)
+            out, err = process.communicate()
+            if process.returncode != 0:
+                raise RequiredCommandMissingException(command)
+
+    def detect(self, context):
+        """Return certainty level that this plugin describes the right build system
+
+        This method is using cls.{REQUIRED,OPTIONAL}_FILES only by default,
+        please extend it in the plugin if more sofisticated methods can be used
+        for given build system.
+
+        :return: 0 <= certainty <= 100
+        :rtype: int
+        """
+        result = 0
+
+        required_files_num = 0
+        self.DETECTED_REQUIRED_FILES = {}  # can be used in the plugin later
+        for tpl in self.REQUIRED_FILES:
+            found = False
+            for ftpl in tpl.split('|'):
+                res = glob1(context['dir'], ftpl)
+                if res:
+                    found = True
+                    self.DETECTED_REQUIRED_FILES.setdefault(tpl, []).extend(res)
+            if found:
+                required_files_num += 1
+        # add max 50 points depending on how many required files are available
+        if self.REQUIRED_FILES:
+            result += int(required_files_num / len(self.REQUIRED_FILES) * 50)
+
+        self.DETECTED_OPTIONAL_FILES = {}
+        for ftpl, score in self.OPTIONAL_FILES.items():
+            res = glob1(context['dir'], ftpl)
+            if res:
+                result += score
+                self.DETECTED_OPTIONAL_FILES.setdefault(ftpl, []).extend(res)
+        if result > 100:
+            return 100
+        return result
+
+    def clean(self, context, args):
+        if self.cfg.test_tox:
+            tox_dir = join(args['dir'], '.tox')
+            if isdir(tox_dir):
+                try:
+                    rmtree(tox_dir)
+                except Exception:
+                    log.debug('cannot remove %s', tox_dir)
+
+        for fn in self.CLEAN_FILES:
+            path = join(context['dir'], fn)
+            if isdir(path):
+                try:
+                    rmtree(path)
+                except Exception:
+                    log.debug('cannot remove %s', path)
+            elif exists(path):
+                try:
+                    remove(path)
+                except Exception:
+                    log.debug('cannot remove %s', path)
+
+        for root, dirs, file_names in walk(context['dir']):
+            for name in dirs:
+                if name == '__pycache__':
+                    dpath = join(root, name)
+                    log.debug('removing dir: %s', dpath)
+                    try:
+                        rmtree(dpath)
+                    except Exception:
+                        log.debug('cannot remove %s', dpath)
+                    else:
+                        dirs.remove(name)
+            for fn in file_names:
+                if fn.endswith(('.pyc', '.pyo')):
+                    fpath = join(root, fn)
+                    log.debug('removing: %s', fpath)
+                    try:
+                        remove(fpath)
+                    except Exception:
+                        log.debug('cannot remove %s', fpath)
+
+    def configure(self, context, args):
+        raise NotImplementedError("configure method not implemented in %s" % self.NAME)
+
+    def install(self, context, args):
+        raise NotImplementedError("install method not implemented in %s" % self.NAME)
+
+    def build(self, context, args):
+        raise NotImplementedError("build method not implemented in %s" % self.NAME)
+
+    @copy_test_files()
+    def test(self, context, args):
+        if self.cfg.test_nose2:
+            return 'cd {build_dir}; {interpreter} -m nose2 -v {args}'
+        elif self.cfg.test_nose:
+            return 'cd {build_dir}; {interpreter} -m nose -v {args}'
+        elif self.cfg.test_pytest:
+            return 'cd {build_dir}; {interpreter} -m pytest {args}'
+        elif self.cfg.test_tox:
+            # tox will call pip to install the module. Let it install the
+            # module inside the virtualenv
+            pydistutils_cfg = join(args['home_dir'], '.pydistutils.cfg')
+            if exists(pydistutils_cfg):
+                remove(pydistutils_cfg)
+            return 'cd {build_dir}; tox -c {dir}/tox.ini --sitepackages -e py{version.major}{version.minor} {args}'
+        elif self.cfg.test_custom:
+            return 'cd {build_dir}; {args}'
+        elif args['version'] == '2.7' or args['version'] >> '3.1' or args['interpreter'] == 'pypy':
+            return 'cd {build_dir}; {interpreter} -m unittest discover -v {args}'
+
+    def execute(self, context, args, command, log_file=None):
+        if log_file is False and self.cfg.really_quiet:
+            log_file = None
+        command = command.format(**args)
+        env = dict(context['ENV'])
+        if 'ENV' in args:
+            env.update(args['ENV'])
+        log.info(command)
+        return execute(command, context['dir'], env, log_file)
+
+    def print_args(self, context, args):
+        cfg = self.cfg
+        if len(cfg.print_args) == 1 and len(cfg.interpreter) == 1 and '{version}' not in cfg.interpreter[0]:
+            i = cfg.print_args[0]
+            if '{' in i:
+                print(i.format(**args))
+            else:
+                print(args.get(i, ''))
+        else:
+            for i in cfg.print_args:
+                if '{' in i:
+                    print(i.format(**args))
+                else:
+                    print('{} {}: {}'.format(args['interpreter'], i, args.get(i, '')))
+
+
+def shell_command(func):
+
+    @wraps(func)
+    def wrapped_func(self, context, args, *oargs, **kwargs):
+        command = kwargs.pop('command', None)
+        if not command:
+            command = func(self, context, args, *oargs, **kwargs)
+            if isinstance(command, int):  # final result
+                return command
+        if not command:
+            log.warn('missing command '
+                     '(plugin=%s, method=%s, interpreter=%s, version=%s)',
+                     self.NAME, func.__name__,
+                     args.get('interpreter'), args.get('version'))
+            return command
+
+        if self.cfg.quiet:
+            log_file = join(args['home_dir'], '{}_cmd.log'.format(func.__name__))
+        else:
+            log_file = False
+
+        quoted_args = dict((k, quote(v)) if k in ('dir', 'destdir')
+                           or k.endswith('_dir') else (k, v)
+                           for k, v in args.items())
+        command = command.format(**quoted_args)
+
+        output = self.execute(context, args, command, log_file)
+        if output['returncode'] != 0:
+            msg = 'exit code={}: {}'.format(output['returncode'], command)
+            if log_file:
+                msg += '\nfull command log is available in {}'.format(log_file)
+            raise Exception(msg)
+        return True
+
+    return wrapped_func
diff --git a/dhpython/build/plugin_autopkgtest.py b/dhpython/build/plugin_autopkgtest.py
new file mode 100644
index 0000000..b9a76e7
--- /dev/null
+++ b/dhpython/build/plugin_autopkgtest.py
@@ -0,0 +1,38 @@
+# vim: et ts=4 sw=4
+# Copyright © 2021 Antonio Terceiro <terceiro@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+from dhpython.build.base import Base, shell_command
+
+
+class BuildSystem(Base):
+    """
+    autopkgtest test runner. All the methods that are not related to
+    testing (configure, build, clean etc) are not implemented by this class, on
+    purpose.
+    """
+
+    NAME = "autopkgtest"
+    DESCRIPTION = 'autopkgtest test runner'
+    SUPPORTED_INTERPRETERS = {'python3', 'python{version}'}
+
+    @shell_command
+    def test(self, context, args):
+        return super().test(context, args)
diff --git a/dhpython/build/plugin_cmake.py b/dhpython/build/plugin_cmake.py
new file mode 100644
index 0000000..7cf52e9
--- /dev/null
+++ b/dhpython/build/plugin_cmake.py
@@ -0,0 +1,71 @@
+# Copyright © 2012-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+from dhpython.build.base import Base, shell_command, copy_test_files
+
+
+class BuildSystem(Base):
+    DESCRIPTION = 'CMake build system (using dh_auto_* commands)'
+    REQUIRED_COMMANDS = ['cmake']
+    REQUIRED_FILES = ['CMakeLists.txt']
+    OPTIONAL_FILES = {'cmake_uninstall.cmake': 10, 'CMakeCache.txt': 10}
+
+    @shell_command
+    def clean(self, context, args):
+        super(BuildSystem, self).clean(context, args)
+        return 'dh_auto_clean --buildsystem=cmake'
+
+    @shell_command
+    def configure(self, context, args):
+        return ('dh_auto_configure --buildsystem=cmake'
+                ' --builddirectory={build_dir} --'
+                # FindPythonInterp:
+                ' -DPYTHON_EXECUTABLE:FILEPATH=/usr/bin/{interpreter}'
+                ' -DPYTHON_LIBRARY:FILEPATH={interpreter.library_file}'
+                ' -DPYTHON_INCLUDE_DIR:PATH={interpreter.include_dir}'
+                # FindPython:
+                ' -DPython_EXECUTABLE=/usr/bin/{interpreter}'
+                ' -DPython_LIBRARY={interpreter.library_file}'
+                ' -DPython_INCLUDE_DIR={interpreter.include_dir}'
+                # FindPython3:
+                ' -DPython3_EXECUTABLE=/usr/bin/{interpreter}'
+                ' -DPython3_LIBRARY={interpreter.library_file}'
+                ' -DPython3_INCLUDE_DIR={interpreter.include_dir}'
+                ' {args}')
+
+    @shell_command
+    def build(self, context, args):
+        return ('dh_auto_build --buildsystem=cmake'
+                ' --builddirectory={build_dir}'
+                ' -- {args}')
+
+    @shell_command
+    def install(self, context, args):
+        return ('dh_auto_install --buildsystem=cmake'
+                ' --builddirectory={build_dir}'
+                ' --destdir={destdir}'
+                ' -- {args}')
+
+    @shell_command
+    @copy_test_files()
+    def test(self, context, args):
+        return ('dh_auto_test --buildsystem=cmake'
+                ' --builddirectory={build_dir}'
+                ' -- {args}')
diff --git a/dhpython/build/plugin_custom.py b/dhpython/build/plugin_custom.py
new file mode 100644
index 0000000..8b317f2
--- /dev/null
+++ b/dhpython/build/plugin_custom.py
@@ -0,0 +1,48 @@
+# Copyright © 2012-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+from dhpython.build.base import Base, shell_command, copy_test_files
+
+
+class BuildSystem(Base):
+    DESCRIPTION = 'use --*-args options to configure this system'
+    SUPPORTED_INTERPRETERS = True  # all interpreters
+
+    @shell_command
+    def clean(self, context, args):
+        super(BuildSystem, self).clean(context, args)
+        return args['args']
+
+    @shell_command
+    def configure(self, context, args):
+        return args['args']
+
+    @shell_command
+    def build(self, context, args):
+        return args['args']
+
+    @shell_command
+    def install(self, context, args):
+        return args['args']
+
+    @shell_command
+    @copy_test_files()
+    def test(self, context, args):
+        return args['args'] or super(BuildSystem, self).test(context, args)
diff --git a/dhpython/build/plugin_distutils.py b/dhpython/build/plugin_distutils.py
new file mode 100644
index 0000000..342ec6f
--- /dev/null
+++ b/dhpython/build/plugin_distutils.py
@@ -0,0 +1,121 @@
+# Copyright © 2012-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import logging
+from glob import glob1
+from os import remove
+from os.path import exists, isdir, join
+from shutil import rmtree
+from dhpython.build.base import Base, shell_command, copy_test_files
+
+log = logging.getLogger('dhpython')
+_setup_tpl = 'setup.py|setup-3.py'
+
+
+def create_pydistutils_cfg(func):
+    """distutils doesn't have sane command-line API - this decorator creates
+    .pydistutils.cfg file to workaround it
+
+    hint: if you think this is plain stupid, please don't read
+    distutils/setuptools/distribute sources
+    """
+
+    def wrapped_func(self, context, args, *oargs, **kwargs):
+        fpath = join(args['home_dir'], '.pydistutils.cfg')
+        if not exists(fpath):
+            with open(fpath, 'w', encoding='utf-8') as fp:
+                lines = ['[clean]\n',
+                         'all=1\n',
+                         '[build]\n',
+                         'build_lib={}\n'.format(args['build_dir']),
+                         '[install]\n',
+                         'force=1\n',
+                         'install_layout=deb\n',
+                         'install_scripts=$base/bin\n',
+                         'install_lib={}\n'.format(args['install_dir']),
+                         'prefix=/usr\n']
+                log.debug('pydistutils config file:\n%s', ''.join(lines))
+                fp.writelines(lines)
+        context['ENV']['HOME'] = args['home_dir']
+        return func(self, context, args, *oargs, **kwargs)
+
+    wrapped_func.__name__ = func.__name__
+    return wrapped_func
+
+
+class BuildSystem(Base):
+    DESCRIPTION = 'Distutils build system'
+    SUPPORTED_INTERPRETERS = {'python', 'python3', 'python{version}',
+                              'python-dbg', 'python3-dbg', 'python{version}-dbg',
+                              'pypy'}
+    REQUIRED_FILES = [_setup_tpl]
+    OPTIONAL_FILES = {'setup.cfg': 1,
+                      'requirements.txt': 1,
+                      'PKG-INFO': 10,
+                      '*.egg-info': 10}
+    CLEAN_FILES = Base.CLEAN_FILES | {'build'}
+
+    def detect(self, context):
+        result = super(BuildSystem, self).detect(context)
+        if _setup_tpl in self.DETECTED_REQUIRED_FILES:
+            context['args']['setup_py'] = self.DETECTED_REQUIRED_FILES[_setup_tpl][0]
+        else:
+            context['args']['setup_py'] = 'setup.py'
+        return result
+
+    @shell_command
+    @create_pydistutils_cfg
+    def clean(self, context, args):
+        super(BuildSystem, self).clean(context, args)
+        if exists(args['interpreter'].binary()):
+            return '{interpreter} {setup_py} clean {args}'
+        return 0  # no need to invoke anything
+
+    @shell_command
+    @create_pydistutils_cfg
+    def configure(self, context, args):
+        return '{interpreter} {setup_py} config {args}'
+
+    @shell_command
+    @create_pydistutils_cfg
+    def build(self, context, args):
+        return '{interpreter.binary_dv} {setup_py} build {args}'
+
+    @shell_command
+    @create_pydistutils_cfg
+    def install(self, context, args):
+        # remove egg-info dirs from build_dir
+        for fname in glob1(args['build_dir'], '*.egg-info'):
+            fpath = join(args['build_dir'], fname)
+            rmtree(fpath) if isdir(fpath) else remove(fpath)
+
+        return '{interpreter.binary_dv} {setup_py} install --root {destdir} {args}'
+
+    @shell_command
+    @create_pydistutils_cfg
+    @copy_test_files()
+    def test(self, context, args):
+        if not self.cfg.custom_tests:
+            fpath = join(args['dir'], args['setup_py'])
+            with open(fpath, 'rb') as fp:
+                if fp.read().find(b'test_suite') > 0:
+                    # TODO: is that enough to detect if test target is available?
+                    return '{interpreter} {setup_py} test {args}'
+        return super(BuildSystem, self).test(context, args)
diff --git a/dhpython/build/plugin_flit.py b/dhpython/build/plugin_flit.py
new file mode 100644
index 0000000..004d657
--- /dev/null
+++ b/dhpython/build/plugin_flit.py
@@ -0,0 +1,170 @@
+# Copyright © 2012-2020 Piotr Ożarowski <piotr@debian.org>
+#           © 2020 Scott Kitterman <scott@kitterman.com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+from fnmatch import fnmatch
+from pathlib import Path
+import copy
+import csv
+import logging
+import os
+import os.path as osp
+import shutil
+import sysconfig
+try:
+    import tomli
+except ModuleNotFoundError:
+    # Plugin still works, only needed for autodetection
+    pass
+try:
+    from flit.install import Installer
+except ImportError:
+    Installer = object
+
+from dhpython.build.base import Base, shell_command
+
+log = logging.getLogger('dhpython')
+
+
+class DebianInstaller(Installer):
+    def install_directly(self, destdir, installdir):
+        """Install a module/package into package directory, and create its
+           scripts.
+        """
+        if installdir[:1] == os.sep:
+            installdir = installdir[1:]
+
+        vars_ = copy.copy(sysconfig.get_config_vars())
+        vars_['base'] = destdir + vars_['base']
+        try:
+            dirs = sysconfig.get_paths(scheme='deb_system', vars=vars_)
+        except KeyError:
+            # Debian hasn't patched sysconfig schemes until 3.10
+            # TODO: Introduce a version check once sysconfig is patched.
+            dirs = sysconfig.get_paths(scheme='posix_prefix', vars=vars_)
+
+        dirs['purelib'] = dirs['platlib'] = osp.join(destdir, installdir)
+        os.makedirs(dirs['purelib'], exist_ok=True)
+        os.makedirs(dirs['scripts'], exist_ok=True)
+
+        dst = osp.join(dirs['purelib'], osp.basename(self.module.path))
+        if osp.lexists(dst):
+            if osp.isdir(dst) and not osp.islink(dst):
+                shutil.rmtree(dst)
+            else:
+                os.unlink(dst)
+
+        src = str(self.module.path)
+        if self.module.is_package:
+            log.info("Installing package %s -> %s", src, dst)
+            shutil.copytree(src, dst)
+            self._record_installed_directory(dst)
+        else:
+            log.info("Installing file %s -> %s", src, dst)
+            shutil.copy2(src, dst)
+            self.installed_files.append(dst)
+
+        scripts = self.ini_info.entrypoints.get('console_scripts', {})
+        if scripts:
+            log.info("Installing scripts to %s", dirs['scripts'])
+            self.install_scripts(scripts, dirs['scripts'])
+
+        log.info("Writing dist-info %s", dirs['purelib'])
+        self.write_dist_info(dirs['purelib'])
+        # Remove direct_url.json - contents are not useful or reproduceable
+        for path in Path(dirs['purelib']).glob("*.dist-info/direct_url.json"):
+            path.unlink()
+        # Remove build path from RECORD files
+        for path in Path(dirs['purelib']).glob("*.dist-info/RECORD"):
+            with open(path) as f:
+                reader = csv.reader(f)
+                records = list(reader)
+            with open(path, 'w') as f:
+                writer = csv.writer(f)
+                for path, hash_, size in records:
+                    path = path.replace(destdir, '')
+                    if fnmatch(path, "*.dist-info/direct_url.json"):
+                        continue
+                    writer.writerow([path, hash_, size])
+
+
+class BuildSystem(Base):
+    DESCRIPTION = 'Flit build system'
+    SUPPORTED_INTERPRETERS = {'python3', 'python{version}'}
+    REQUIRED_FILES = ['pyproject.toml']
+    OPTIONAL_FILES = {}
+    CLEAN_FILES = Base.CLEAN_FILES | {'build'}
+
+    def detect(self, context):
+        """Return certainty level that this plugin describes the right build
+        system
+
+        This method uses cls.{REQUIRED}_FILES (pyroject.toml) as well as
+        checking to see if build-backend is set to flit_core.buildapi.
+
+        Score is 85 if both are present (to allow manually setting distutils to
+        score higher if set).
+
+        :return: 0 <= certainty <= 100
+        :rtype: int
+        """
+        if Installer is object:
+            return 0
+
+        result = super().detect(context)
+        if result > 100:
+            return 100
+        return result
+
+    def clean(self, context, args):
+        super().clean(context, args)
+        if osp.exists(args['interpreter'].binary()):
+            log.debug("removing '%s' (and everything under it)",
+                      args['build_dir'])
+            osp.isdir(args['build_dir']) and shutil.rmtree(args['build_dir'])
+        return 0  # no need to invoke anything
+
+    def configure(self, context, args):
+        # Flit does not support binary extensions
+        return 0  # Not needed for flit
+
+    def build(self, context, args):
+        log.warning("The pybuild flit plugin is deprecated, "
+                    "please use the pyproject plugin instead.")
+        my_dir = Path(args['dir'])
+        install_kwargs = {'user': False, 'symlink': False, 'deps': 'none'}
+        DebianInstaller.from_ini_path(my_dir / 'pyproject.toml',
+                                      **install_kwargs).install_directly(
+                                          args['build_dir'], '')
+        # These get byte compiled too, although it's not logged.
+        return 0  # Not needed for flit
+
+    def install(self, context, args):
+        my_dir = Path(args['dir'])
+        install_kwargs = {'user': False, 'symlink': False, 'deps': 'none'}
+        DebianInstaller.from_ini_path(my_dir / 'pyproject.toml',
+                                      **install_kwargs).install_directly(
+                                          args['destdir'],
+                                          args['install_dir'])
+        return 0  # Not needed for flit'
+
+    @shell_command
+    def test(self, context, args):
+        return super().test(context, args)
diff --git a/dhpython/build/plugin_pyproject.py b/dhpython/build/plugin_pyproject.py
new file mode 100644
index 0000000..b24aa9a
--- /dev/null
+++ b/dhpython/build/plugin_pyproject.py
@@ -0,0 +1,201 @@
+# Copyright © 2012-2020 Piotr Ożarowski <piotr@debian.org>
+#           © 2020 Scott Kitterman <scott@kitterman.com>
+#           © 2021 Stuart Prescott <stuart@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+from pathlib import Path
+import logging
+import os.path as osp
+import shutil
+import sysconfig
+try:
+    import tomli
+except ModuleNotFoundError:
+    # Plugin still works, only needed for autodetection
+    pass
+try:
+    from installer import install
+    from installer.destinations import SchemeDictionaryDestination
+    from installer.sources import WheelFile
+except ModuleNotFoundError:
+    SchemeDictionaryDestination = WheelFile = install = None
+
+from dhpython.build.base import Base, shell_command
+
+log = logging.getLogger('dhpython')
+
+
+class BuildSystem(Base):
+    DESCRIPTION = 'Generic PEP517 build system'
+    SUPPORTED_INTERPRETERS = {'python3', 'python{version}'}
+    REQUIRED_FILES = ['pyproject.toml']
+    OPTIONAL_FILES = {}
+    CLEAN_FILES = Base.CLEAN_FILES | {'build'}
+
+    def detect(self, context):
+        """Return certainty level that this plugin describes the right build
+        system
+
+        This method uses cls.{REQUIRED}_FILES (pyroject.toml) only; any
+        other PEP517 compliant builder (such as the flit) builder should
+        indicate higher specificity than this plugin.
+
+        :return: 0 <= certainty <= 100
+        :rtype: int
+        """
+        result = super().detect(context)
+        # Temporarily reduce the threshold while we're in beta
+        result -= 20
+
+        try:
+            with open('pyproject.toml', 'rb') as f:
+                pyproject = tomli.load(f)
+            if pyproject.get('build-system', {}).get('build-backend'):
+                result += 10
+            else:
+                # Not a PEP517 built package
+                result = 0
+        except NameError:
+            # No toml, no autdetection
+            result = 0
+        except FileNotFoundError:
+            # Not a PEP517 package
+            result = 0
+        if result > 100:
+            return 100
+        return result
+
+    def clean(self, context, args):
+        super().clean(context, args)
+        if osp.exists(args['interpreter'].binary()):
+            log.debug("removing '%s' (and everything under it)",
+                      args['build_dir'])
+            osp.isdir(args['build_dir']) and shutil.rmtree(args['build_dir'])
+        return 0  # no need to invoke anything
+
+    def configure(self, context, args):
+        if install is None:
+            raise Exception("PEP517 plugin dependencies are not available. "
+                            "Please Build-Depend on pybuild-plugin-pyproject.")
+        # No separate configure step
+        return 0
+
+    def build(self, context, args):
+        self.build_step1(context, args)
+        self.build_step2(context, args)
+
+    @shell_command
+    def build_step1(self, context, args):
+        """ build a wheel using the PEP517 builder defined by upstream """
+        log.info('Building wheel for %s with "build" module',
+                 args['interpreter'])
+        context['ENV']['FLIT_NO_NETWORK'] = '1'
+        context['ENV']['HOME'] = args['home_dir']
+        return ('{interpreter} -m build '
+                '--skip-dependency-check --no-isolation --wheel '
+                '--outdir ' + args['home_dir'] +
+                ' {args}'
+               )
+
+    def build_step2(self, context, args):
+        """ unpack the wheel into pybuild's normal  """
+        log.info('Unpacking wheel built for %s with "installer" module',
+                 args['interpreter'])
+        extras = {}
+        for extra in ('scripts', 'data'):
+            path = Path(args["home_dir"]) / extra
+            if osp.exists(path):
+                log.warning(f'{extra.title()} directory already exists, '
+                            'skipping unpack. '
+                            'Is the Python package being built twice?')
+                return
+            extras[extra] = path
+        destination = SchemeDictionaryDestination(
+            {
+                'platlib': args['build_dir'],
+                'purelib': args['build_dir'],
+                'scripts': extras['scripts'],
+                'data': extras['data'],
+            },
+            interpreter=args['interpreter'].binary_dv,
+            script_kind='posix',
+        )
+
+        # FIXME this next step will unpack every single wheel file it finds
+        # which is probably ok since each wheel is built in a separate
+        # directory; but perhaps it should only accept the correctly named
+        # wheels that match the current interpreter?
+        # python-packaging has relevant utilities in
+        #   - packaging/utils.py::parse_wheel_filename
+        #   - packaging/tags.py (although it is current-interpreter-centric)
+        wheels = Path(args['home_dir']).glob('*.whl')
+        for wheel in wheels:
+            if wheel.name.startswith('UNKNOWN'):
+                raise Exception(f'UNKNOWN wheel found: {wheel.name}. Does '
+                                'pyproject.toml specify a build-backend?')
+            with WheelFile.open(wheel) as source:
+                install(
+                    source=source,
+                    destination=destination,
+                    additional_metadata={},
+                )
+
+    def install(self, context, args):
+        log.info('Copying package built for %s to destdir',
+                 args['interpreter'])
+        try:
+            paths = sysconfig.get_paths(scheme='deb_system')
+        except KeyError:
+            # Debian hasn't patched sysconfig schemes until 3.10
+            # TODO: Introduce a version check once sysconfig is patched.
+            paths = sysconfig.get_paths(scheme='posix_prefix')
+
+        # start by copying the data and scripts
+        for extra in ('data', 'scripts'):
+            src_dir = Path(args['home_dir']) / extra
+            if not src_dir.exists():
+                continue
+            target_dir = args['destdir'] + paths[extra]
+            log.debug('Copying %s directory contents from %s -> %s',
+                      extra, src_dir, target_dir)
+            shutil.copytree(
+                src_dir,
+                target_dir,
+                dirs_exist_ok=True,
+            )
+
+        # then copy the modules
+        module_dir = args['build_dir']
+        target_dir = args['destdir'] + args['install_dir']
+        log.debug('Copying module contents from %s -> %s',
+                  module_dir, target_dir)
+        shutil.copytree(
+            module_dir,
+            target_dir,
+            dirs_exist_ok=True,
+        )
+
+    @shell_command
+    def test(self, context, args):
+        scripts = Path(args["home_dir"]) / 'scripts'
+        if scripts.exists():
+            context['ENV']['PATH'] = f"{scripts}:{context['ENV']['PATH']}"
+        context['ENV']['HOME'] = args['home_dir']
+        return super().test(context, args)
diff --git a/dhpython/debhelper.py b/dhpython/debhelper.py
new file mode 100644
index 0000000..f497a60
--- /dev/null
+++ b/dhpython/debhelper.py
@@ -0,0 +1,327 @@
+# Copyright © 2010-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import errno
+import logging
+import re
+from os import makedirs, chmod, environ
+from os.path import basename, exists, join, dirname
+from sys import argv
+from dhpython import DEPENDS_SUBSTVARS, PKG_NAME_TPLS, RT_LOCATIONS, RT_TPLS
+
+log = logging.getLogger('dhpython')
+parse_dep = re.compile('''[,\s]*
+    (?P<name>[^ :]+)(?::any)?
+    \s*
+    \(?(?P<version>([>=<]{2,}|=)\s*[^\)]+)?\)?
+    \s*
+    (?:\[(?P<arch>[^\]]+)\])?
+    ''', re.VERBOSE).match
+
+
+def build_options(**options):
+    """Build an Options object from kw options"""
+    default_options = {
+        'arch': None,
+        'package': [],
+        'no_package': [],
+        'write_log': False,
+        'remaining_packages': False,
+    }
+    built_options = default_options
+    built_options.update(options)
+    return type('Options', (object,), built_options)
+
+
+class DebHelper:
+    """Reinvents the wheel / some dh functionality (Perl is ugly ;-P)"""
+
+    def __init__(self, options, impl='cpython3'):
+        self.options = options
+        self.packages = {}
+        self.build_depends = {}
+        self.python_version = None
+        # Note that each DebHelper instance supports ONE interpreter type only
+        # it's not possible to mix cpython2, cpython3 and pypy here
+        self.impl = impl
+        self.command = {
+            'cpython2': 'dh_python2',
+            'cpython3': 'dh_python3',
+            'pypy': 'dh_pypy',
+        }[impl]
+        skip_tpl = set()
+        for name, tpls in PKG_NAME_TPLS.items():
+            if name != impl:
+                skip_tpl.update(tpls)
+        skip_tpl = tuple(skip_tpl)
+        substvar = DEPENDS_SUBSTVARS[impl]
+
+        pkgs = options.package
+        skip_pkgs = options.no_package
+
+        try:
+            with open('debian/control', 'r', encoding='utf-8') as fp:
+                paragraphs = [{}]
+                field = None
+                for lineno, line in enumerate(fp, 1):
+                    if line.startswith('#'):
+                        continue
+                    if not line.strip():
+                        if paragraphs[-1]:
+                            paragraphs.append({})
+                            field = None
+                        continue
+                    if line[0].isspace():  # Continuation
+                        paragraphs[-1][field] += line.rstrip()
+                        continue
+                    if not ':' in line:
+                        raise Exception(
+                            'Unable to parse line %i in debian/control: %s'
+                            % (lineno, line))
+                    field, value = line.split(':', 1)
+                    field = field.lower()
+                    paragraphs[-1][field] = value.strip()
+        except IOError:
+            raise Exception('cannot find debian/control file')
+
+        # Trailing new lines?
+        if not paragraphs[-1]:
+            paragraphs.pop()
+
+        if len(paragraphs) < 2:
+            raise Exception('Unable to parse debian/control, found less than '
+                            '2 paragraphs')
+
+        self.source_name = paragraphs[0]['source']
+        if self.impl == 'cpython3' and 'x-python3-version' in paragraphs[0]:
+            self.python_version = paragraphs[0]['x-python3-version']
+            if len(self.python_version.split(',')) > 2:
+                raise ValueError('too many arguments provided for '
+                                 'X-Python3-Version: min and max only.')
+        elif self.impl == 'cpython2':
+            if 'x-python-version' in paragraphs[0]:
+                self.python_version = paragraphs[0]['x-python-version']
+            elif 'xs-python-version' in paragraphs[0]:
+                self.python_version = paragraphs[0]['xs-python-version']
+
+        build_depends = []
+        for field in ('build-depends', 'build-depends-indep',
+                      'build-depends-arch'):
+            if field in paragraphs[0]:
+                build_depends.append(paragraphs[0][field])
+        build_depends = ', '.join(build_depends)
+        for dep1 in build_depends.split(','):
+            for dep2 in dep1.split('|'):
+                details = parse_dep(dep2)
+                if details:
+                    details = details.groupdict()
+                    if details['arch']:
+                        architectures = details['arch'].split()
+                    else:
+                        architectures = [None]
+                    for arch in architectures:
+                        self.build_depends.setdefault(
+                            details['name'], {})[arch] = details['version']
+
+        for paragraph_no, paragraph in enumerate(paragraphs[1:], 2):
+            if 'package' not in paragraph:
+                raise Exception('Unable to parse debian/control, paragraph %i '
+                                'missing Package field' % paragraph_no)
+            binary_package = paragraph['package']
+            if skip_tpl and binary_package.startswith(skip_tpl):
+                log.debug('skipping package: %s', binary_package)
+                continue
+            if pkgs and binary_package not in pkgs:
+                continue
+            if skip_pkgs and binary_package in skip_pkgs:
+                continue
+            if (options.remaining_packages and
+                    self.has_acted_on_package(binary_package)):
+                continue
+            pkg = {
+                'substvars': {},
+                'autoscripts': {},
+                'rtupdates': [],
+                'arch': paragraph['architecture'],
+            }
+            if (options.arch is False and pkg['arch'] != 'all' or
+                    options.arch is True and pkg['arch'] == 'all'):
+                # TODO: check also if arch matches current architecture:
+                continue
+
+            if not binary_package.startswith(PKG_NAME_TPLS[impl]):
+                # package doesn't have common prefix (python-, python3-, pypy-)
+                # so lets check if Depends/Recommends contains the
+                # appropriate substvar
+                if (substvar not in paragraph.get('depends', '')
+                        and substvar not in paragraph.get('recommends', '')):
+                    log.debug('skipping package %s (missing %s in '
+                              'Depends/Recommends)',
+                              binary_package, substvar)
+                    continue
+            # Operate on binary_package
+            self.packages[binary_package] = pkg
+
+        fp.close()
+        log.debug('source=%s, binary packages=%s', self.source_name,
+                  list(self.packages.keys()))
+
+    def has_acted_on_package(self, package):
+        try:
+            with open('debian/{}.debhelper.log'.format(package),
+                      encoding='utf-8') as f:
+                for line in f:
+                    if line.strip() == self.command:
+                        return True
+        except IOError as e:
+            if e.errno != errno.ENOENT:
+                raise
+        return False
+
+    def addsubstvar(self, package, name, value):
+        """debhelper's addsubstvar"""
+        self.packages[package]['substvars'].setdefault(name, []).append(value)
+
+    def autoscript(self, package, when, template, args):
+        """debhelper's autoscript"""
+        self.packages[package]['autoscripts'].setdefault(when, {})\
+            .setdefault(template, []).append(args)
+
+    def add_rtupdate(self, package, value):
+        self.packages[package]['rtupdates'].append(value)
+
+    def save_autoscripts(self):
+        for package, settings in self.packages.items():
+            autoscripts = settings.get('autoscripts')
+            if not autoscripts:
+                continue
+
+            for when, templates in autoscripts.items():
+                fn = "debian/%s.%s.debhelper" % (package, when)
+                if exists(fn):
+                    with open(fn, 'r', encoding='utf-8') as datafile:
+                        data = datafile.read()
+                else:
+                    data = ''
+
+                new_data = ''
+                for tpl_name, args in templates.items():
+                    for i in args:
+                        # try local one first (useful while testing dh_python3)
+                        fpath = join(dirname(__file__), '..',
+                                     "autoscripts/%s" % tpl_name)
+                        if not exists(fpath):
+                            fpath = "/usr/share/debhelper/autoscripts/%s" % tpl_name
+                        with open(fpath, 'r', encoding='utf-8') as tplfile:
+                            tpl = tplfile.read()
+                        if self.options.compile_all and args:
+                            # TODO: should args be checked to contain dir name?
+                            tpl = tpl.replace('-p #PACKAGE#', '')
+                        elif settings['arch'] == 'all':
+                            tpl = tpl.replace('#PACKAGE#', package)
+                        else:
+                            arch = environ['DEB_HOST_ARCH']
+                            tpl = tpl.replace('#PACKAGE#', '%s:%s' % (package, arch))
+                        tpl = tpl.replace('#ARGS#', i)
+                        if tpl not in data and tpl not in new_data:
+                            new_data += "\n%s" % tpl
+                if new_data:
+                    data += '\n# Automatically added by {}'.format(basename(argv[0])) +\
+                            '{}\n# End automatically added section\n'.format(new_data)
+                    fp = open(fn, 'w', encoding='utf-8')
+                    fp.write(data)
+                    fp.close()
+
+    def save_substvars(self):
+        for package, settings in self.packages.items():
+            substvars = settings.get('substvars')
+            if not substvars:
+                continue
+            fn = "debian/%s.substvars" % package
+            if exists(fn):
+                with open(fn, 'r', encoding='utf-8') as datafile:
+                    data = datafile.read()
+            else:
+                data = ''
+            for name, values in substvars.items():
+                p = data.find("%s=" % name)
+                if p > -1:  # parse the line and remove it from data
+                    e = data[p:].find('\n')
+                    line = data[p + len("%s=" % name):
+                                p + e if e > -1 else None]
+                    items = [i.strip() for i in line.split(',') if i]
+                    if e > -1 and data[p + e:].strip():
+                        data = "%s\n%s" % (data[:p], data[p + e:])
+                    else:
+                        data = data[:p]
+                else:
+                    items = []
+                for j in values:
+                    if j not in items:
+                        items.append(j)
+                if items:
+                    if data:
+                        data += '\n'
+                    data += "%s=%s\n" % (name, ', '.join(items))
+            data = data.replace('\n\n', '\n')
+            if data:
+                fp = open(fn, 'w', encoding='utf-8')
+                fp.write(data)
+                fp.close()
+
+    def save_rtupdate(self):
+        for package, settings in self.packages.items():
+            pkg_arg = '' if self.options.compile_all else "-p %s" % package
+            values = settings.get('rtupdates')
+            if not values:
+                continue
+            d = 'debian/{}/{}'.format(package, RT_LOCATIONS[self.impl])
+            if not exists(d):
+                makedirs(d)
+            fn = "%s/%s.rtupdate" % (d, package)
+            if exists(fn):
+                data = open(fn, 'r', encoding='utf-8').read()
+            else:
+                data = "#! /bin/sh\nset -e"
+            for dname, args in values:
+                cmd = RT_TPLS[self.impl].format(pkg_arg=pkg_arg,
+                                                dname=dname,
+                                                args=args)
+                if cmd not in data:
+                    data += "\n%s" % cmd
+            if data:
+                fp = open(fn, 'w', encoding='utf-8')
+                fp.write(data)
+                fp.close()
+                chmod(fn, 0o755)
+
+    def save_log(self):
+        if not self.options.write_log:
+            return
+        for package, settings in self.packages.items():
+            with open('debian/{}.debhelper.log'.format(package),
+                      'a', encoding='utf-8') as f:
+                f.write(self.command + '\n')
+
+    def save(self):
+        self.save_substvars()
+        self.save_autoscripts()
+        self.save_rtupdate()
+        self.save_log()
diff --git a/dhpython/depends.py b/dhpython/depends.py
new file mode 100644
index 0000000..e17951c
--- /dev/null
+++ b/dhpython/depends.py
@@ -0,0 +1,281 @@
+# Copyright © 2010-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import logging
+from functools import partial
+from os.path import exists, join
+from dhpython import PKG_PREFIX_MAP, MINPYCDEP
+from dhpython.pydist import parse_pydep, parse_requires_dist, guess_dependency
+from dhpython.version import default, supported, VersionRange
+
+log = logging.getLogger('dhpython')
+
+
+class Dependencies:
+    """Store relations (dependencies, etc.) between packages."""
+
+    def __init__(self, package, impl='cpython3', bdep=None):
+        self.impl = impl
+        self.package = package
+        bdep = self.bdep = bdep or {}
+        self.is_debug_package = dbgpkg = package.endswith('-dbg')
+
+        # TODO: move it to PyPy and CPython{2,3} classes
+        self.ipkg_vtpl = 'python%s-dbg' if dbgpkg else 'python%s'
+        if impl == 'cpython3':
+            self.ipkg_tpl = 'python3-dbg' if dbgpkg else 'python3'
+        elif impl == 'cpython2':
+            self.ipkg_tpl = 'python2-dbg' if dbgpkg else 'python2'
+        elif impl == 'pypy':
+            self.ipkg_tpl = 'pypy-dbg' if dbgpkg else 'pypy'
+            self.ipkg_vtpl = 'pypy%s-dbg' if dbgpkg else 'pypy%s'
+        if impl == 'pypy':
+            self.ipkg_tpl_ma = self.ipkg_tpl
+            self.ipkg_vtpl_ma = self.ipkg_vtpl
+        else:
+            self.ipkg_tpl_ma = self.ipkg_tpl + ':any'
+            self.ipkg_vtpl_ma = self.ipkg_vtpl + ':any'
+
+        self.python_dev_in_bd = 'python-dev' in bdep or\
+                                'python-all-dev' in bdep or\
+                                'python2-dev' in bdep or\
+                                'python2-all-dev' in bdep or\
+                                'python2.7-dev' in bdep or\
+                                'python3-dev' in bdep or\
+                                'python3-all-dev' in bdep
+
+        self.depends = set()
+        self.recommends = []
+        self.suggests = []
+        self.enhances = []
+        self.breaks = []
+        self.rtscripts = []
+
+    def export_to(self, dh):
+        """Fill in debhelper's substvars."""
+        prefix = PKG_PREFIX_MAP.get(self.impl, 'misc')
+        for i in sorted(self.depends):
+            dh.addsubstvar(self.package, '{}:Depends'.format(prefix), i)
+        for i in sorted(self.recommends):
+            dh.addsubstvar(self.package, '{}:Recommends'.format(prefix), i)
+        for i in sorted(self.suggests):
+            dh.addsubstvar(self.package, '{}:Suggests'.format(prefix), i)
+        for i in sorted(self.enhances):
+            dh.addsubstvar(self.package, '{}:Enhances'.format(prefix), i)
+        for i in sorted(self.breaks):
+            dh.addsubstvar(self.package, '{}:Breaks'.format(prefix), i)
+        for i in sorted(self.rtscripts):
+            dh.add_rtupdate(self.package, i)
+
+    def __str__(self):
+        return "D=%s; R=%s; S=%s; E=%s, B=%s; RT=%s" %\
+            (self.depends, self.recommends, self.suggests,
+             self.enhances, self.breaks, self.rtscripts)
+
+    def depend(self, value):
+        if value and value not in self.depends:
+            self.depends.add(value)
+
+    def recommend(self, value):
+        if value and value not in self.recommends:
+            self.recommends.append(value)
+
+    def suggest(self, value):
+        if value and value not in self.suggests:
+            self.suggests.append(value)
+
+    def enhance(self, value):
+        if value and value not in self.enhances:
+            self.enhances.append(value)
+
+    def break_(self, value):
+        if value and value not in self.breaks:
+            self.breaks.append(value)
+
+    def rtscript(self, value):
+        if value not in self.rtscripts:
+            self.rtscripts.append(value)
+
+    def parse(self, stats, options):
+        log.debug('generating dependencies for package %s', self.package)
+        tpl = self.ipkg_tpl
+        vtpl = self.ipkg_vtpl
+        tpl_ma = self.ipkg_tpl_ma
+        vtpl_ma = self.ipkg_vtpl_ma
+        vrange = options.vrange
+
+        if vrange and any((stats['compile'], stats['public_vers'],
+                           stats['ext_vers'], stats['ext_no_version'],
+                           stats['shebangs'])):
+            if any((stats['compile'], stats['public_vers'], stats['shebangs'])):
+                tpl_tmp = tpl_ma
+            else:
+                tpl_tmp = tpl
+            minv = vrange.minver
+            # note it's an open interval (i.e. do not add 1 here!):
+            maxv = vrange.maxver
+            if minv == maxv:
+                self.depend(vtpl % minv)
+                minv = maxv = None
+            if minv:
+                self.depend("%s (>= %s~)" % (tpl_tmp, minv))
+            if maxv:
+                self.depend("%s (<< %s)" % (tpl_tmp, maxv))
+
+        if self.impl == 'cpython2' and stats['public_vers']:
+            # additional Depends to block python package transitions
+            sorted_vers = sorted(stats['public_vers'])
+            minv = sorted_vers[0]
+            maxv = sorted_vers[-1]
+            if minv <= default(self.impl):
+                self.depend("%s (>= %s~)" % (tpl_ma, minv))
+            if maxv >= default(self.impl):
+                self.depend("%s (<< %s)" % (tpl_ma, maxv + 1))
+
+        if self.impl == 'pypy' and stats.get('ext_soabi'):
+            # TODO: make sure alternative is used only for the same extension names
+            # ie. for foo.ABI1.so, foo.ABI2.so, bar.ABI3,so, bar.ABI4.so generate:
+            # pypy-abi-ABI1 | pypy-abi-ABI2, pypy-abi-ABI3 | pypy-abi-ABI4
+            self.depend('|'.join(soabi.replace('-', '-abi-')
+                                 for soabi in sorted(stats['ext_soabi'])))
+
+        if stats['ext_vers']:
+            # TODO: what about extensions with stable ABI?
+            sorted_vers = sorted(stats['ext_vers'])
+            minv = sorted_vers[0]
+            maxv = sorted_vers[-1]
+            #self.depend('|'.join(vtpl % i for i in stats['ext_vers']))
+            if minv <= default(self.impl):
+                self.depend("%s (>= %s~)" % (tpl, minv))
+            if maxv >= default(self.impl):
+                self.depend("%s (<< %s)" % (tpl, maxv + 1))
+
+        # make sure py{,3}compile binary is available
+        if stats['compile'] and self.impl in MINPYCDEP:
+            self.depend(MINPYCDEP[self.impl])
+
+        for ipreter in stats['shebangs']:
+            self.depend("%s%s" % (ipreter, '' if self.impl == 'pypy' else ':any'))
+
+        supported_versions = supported(self.impl)
+        default_version = default(self.impl)
+        for private_dir, details in stats['private_dirs'].items():
+            versions = list(i.version for i in details.get('shebangs', []) if i.version and i.version.minor)
+
+            for v in versions:
+                if v in supported_versions:
+                    self.depend(vtpl_ma % v)
+                else:
+                    log.info('dependency on %s (from shebang) ignored'
+                             ' - it\'s not supported anymore', vtpl % v)
+            # /usr/bin/python{,3} shebang → add python{,3} to Depends
+            if any(True for i in details.get('shebangs', []) if i.version is None or i.version.minor is None):
+                self.depend(tpl_ma)
+
+            extensions = False
+            if self.python_dev_in_bd:
+                extensions = sorted(details.get('ext_vers', set()))
+                #self.depend('|'.join(vtpl % i for i in extensions))
+                if extensions:
+                    self.depend("%s (>= %s~)" % (tpl, extensions[0]))
+                    self.depend("%s (<< %s)" % (tpl, extensions[-1] + 1))
+                elif details.get('ext_no_version'):
+                    # assume unrecognized extension was built for default interpreter version
+                    self.depend("%s (>= %s~)" % (tpl, default_version))
+                    self.depend("%s (<< %s)" % (tpl, default_version + 1))
+
+            if details.get('compile'):
+                if self.impl in MINPYCDEP:
+                    self.depend(MINPYCDEP[self.impl])
+                args = ''
+                if extensions:
+                    args += "-V %s" % VersionRange(minver=extensions[0], maxver=extensions[-1])
+                elif len(versions) == 1:  # only one version from shebang
+                    #if versions[0] in supported_versions:
+                    args += "-V %s" % versions[0]
+                    # ... otherwise compile with default version
+                elif details.get('ext_no_version'):
+                    # assume unrecognized extension was built for default interpreter version
+                    args += "-V %s" % default_version
+                elif vrange:
+                    args += "-V %s" % vrange
+                    if vrange.minver == vrange.maxver:
+                        self.depend(vtpl % vrange.minver)
+                    else:
+                        if vrange.minver:  # minimum version specified
+                            self.depend("%s (>= %s~)" % (tpl_ma, vrange.minver))
+                        if vrange.maxver:  # maximum version specified
+                            self.depend("%s (<< %s)" % (tpl_ma, vrange.maxver + 1))
+
+                for regex in options.regexpr or []:
+                    args += " -X '%s'" % regex.pattern.replace("'", r"'\''")
+                self.rtscript((private_dir, args))
+
+        section_options = {
+            'depends_sec': options.depends_section,
+            'recommends_sec': options.recommends_section,
+            'suggests_sec': options.suggests_section,
+        }
+        guess_deps = partial(guess_dependency, impl=self.impl, bdep=self.bdep,
+                             accept_upstream_versions=options.accept_upstream_versions)
+        if options.guess_deps:
+            for fn in stats['requires.txt']:
+                # TODO: should options.recommends and options.suggests be
+                # removed from requires.txt?
+                deps = parse_pydep(self.impl, fn, bdep=self.bdep, **section_options)
+                [self.depend(i) for i in deps['depends']]
+                [self.recommend(i) for i in deps['recommends']]
+                [self.suggest(i) for i in deps['suggests']]
+            for fpath in stats['egg-info']:
+                with open(fpath, 'r', encoding='utf-8') as fp:
+                    for line in fp:
+                        if line.startswith('Requires: '):
+                            req = line[10:].strip()
+                            self.depend(guess_deps(req=req))
+            for fpath in stats['dist-info']:
+                deps = parse_requires_dist(self.impl, fpath, bdep=self.bdep,
+                                           **section_options)
+                [self.depend(i) for i in deps['depends']]
+                [self.recommend(i) for i in deps['recommends']]
+                [self.suggest(i) for i in deps['suggests']]
+
+        # add dependencies from --depends
+        for item in options.depends or []:
+            self.depend(guess_deps(req=item))
+        # add dependencies from --recommends
+        for item in options.recommends or []:
+            self.recommend(guess_deps(req=item))
+        # add dependencies from --suggests
+        for item in options.suggests or []:
+            self.suggest(guess_deps(req=item))
+        # add dependencies from --requires
+        for fn in options.requires or []:
+            fpath = join('debian', self.package, fn)
+            if not exists(fpath):
+                fpath = fn
+                if not exists(fpath):
+                    log.warn('cannot find requirements file: %s', fn)
+                    continue
+            deps = parse_pydep(self.impl, fpath, bdep=self.bdep, **section_options)
+            [self.depend(i) for i in deps['depends']]
+            [self.recommend(i) for i in deps['recommends']]
+            [self.suggest(i) for i in deps['suggests']]
+
+        log.debug(self)
diff --git a/dhpython/exceptions.py b/dhpython/exceptions.py
new file mode 100644
index 0000000..085bb89
--- /dev/null
+++ b/dhpython/exceptions.py
@@ -0,0 +1,23 @@
+# Copyright © 2022 Stefano Rivera <stefanor@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+
+class RequiredCommandMissingException(Exception):
+    pass
diff --git a/dhpython/fs.py b/dhpython/fs.py
new file mode 100644
index 0000000..445422e
--- /dev/null
+++ b/dhpython/fs.py
@@ -0,0 +1,587 @@
+# Copyright © 2013-2019 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import difflib
+import hashlib
+import logging
+import os
+import re
+import sys
+from filecmp import cmp as cmpfile
+from glob import glob
+from os.path import (lexists, exists, getsize, isdir, islink, join, realpath,
+                     relpath, split, splitext)
+from shutil import rmtree
+from stat import ST_MODE, S_IXUSR, S_IXGRP, S_IXOTH
+from dhpython import MULTIARCH_DIR_TPL
+from dhpython.tools import fix_shebang, clean_egg_name
+from dhpython.interpreter import Interpreter
+
+log = logging.getLogger('dhpython')
+
+
+def fix_locations(package, interpreter, versions, options):
+    """Move files to the right location."""
+    # make a copy since we change version later
+    interpreter = Interpreter(interpreter)
+
+    for version in versions:
+        interpreter.version = version
+
+        dstdir = interpreter.sitedir(package)
+        for srcdir in interpreter.old_sitedirs(package):
+            if isdir(srcdir):
+                # TODO: what about relative symlinks?
+                log.debug('moving files from %s to %s', srcdir, dstdir)
+                share_files(srcdir, dstdir, interpreter, options)
+                try:
+                    os.removedirs(srcdir)
+                except OSError:
+                    pass
+
+        # do the same with debug locations
+        dstdir = interpreter.sitedir(package, gdb=True)
+        for srcdir in interpreter.old_sitedirs(package, gdb=True):
+            if isdir(srcdir):
+                log.debug('moving files from %s to %s', srcdir, dstdir)
+                share_files(srcdir, dstdir, interpreter, options)
+                try:
+                    os.removedirs(srcdir)
+                except OSError:
+                    pass
+
+        # move files from /usr/include/pythonX.Y/ to …/pythonX.Ym/
+        if interpreter.symlinked_include_dir:
+            srcdir = "debian/%s%s" % (package, interpreter.symlinked_include_dir)
+            if srcdir and isdir(srcdir):
+                dstdir = "debian/%s%s" % (package, interpreter.include_dir)
+                log.debug('moving files from %s to %s', srcdir, dstdir)
+                share_files(srcdir, dstdir, interpreter, options)
+                try:
+                    os.removedirs(srcdir)
+                except OSError:
+                    pass
+
+
+def share_files(srcdir, dstdir, interpreter, options):
+    """Try to move as many files from srcdir to dstdir as possible."""
+    cleanup_actions = []
+    for i in os.listdir(srcdir):
+        fpath1 = join(srcdir, i)
+        if not lexists(fpath1):  # removed in rename_ext
+            continue
+        if i.endswith('.pyc'):  # f.e. when tests were invoked on installed files
+            os.remove(fpath1)
+            continue
+        if not options.no_ext_rename and splitext(i)[-1] == '.so':
+            # try to rename extension here as well (in :meth:`scan` info about
+            # Python version is gone)
+            version = interpreter.parse_public_dir(srcdir)
+            if version and version is not True:
+                fpath1 = Scan.rename_ext(fpath1, interpreter, version)
+                i = split(fpath1)[-1]
+        if srcdir.endswith(".dist-info"):
+            if i in ('COPYING', 'LICENSE') or i.startswith(
+                    ('COPYING.', 'LICENSE.')):
+                os.remove(fpath1)
+                cleanup_actions.append((remove_from_RECORD, ([i],)))
+                continue
+            elif isdir(fpath1) and i in ('licenses', 'license_files'):
+                cleanup_actions.append((
+                    remove_from_RECORD,
+                    ([
+                        relpath(license, srcdir)
+                        for license in glob(join(srcdir, i, '**'))
+                    ],)
+                ))
+                rmtree(fpath1)
+                continue
+        fpath2 = join(dstdir, i)
+        if not isdir(fpath1) and not exists(fpath2):
+            # do not rename directories here - all .so files have to be renamed first
+            os.renames(fpath1, fpath2)
+            continue
+        if islink(fpath1):
+            # move symlinks without changing them if they point to the same place
+            if not exists(fpath2):
+                os.renames(fpath1, fpath2)
+            elif realpath(fpath1) == realpath(fpath2):
+                os.remove(fpath1)
+        elif isdir(fpath1):
+            share_files(fpath1, fpath2, interpreter, options)
+        elif cmpfile(fpath1, fpath2, shallow=False):
+            os.remove(fpath1)
+        elif i.endswith(('.abi3.so', '.abi4.so')) and interpreter.parse_public_dir(srcdir):
+            log.warning('%s differs from previous one, removing anyway (%s)', i, srcdir)
+            os.remove(fpath1)
+        elif srcdir.endswith(".dist-info"):
+            # dist-info file that differs... try merging
+            if i == "WHEEL":
+                if merge_WHEEL(fpath1, fpath2):
+                    cleanup_actions.append((fix_merged_RECORD, ()))
+                os.remove(fpath1)
+            elif i == "RECORD":
+                merge_RECORD(fpath1, fpath2)
+                os.remove(fpath1)
+            else:
+                log.warn("No merge driver for dist-info file %s", i)
+        else:
+            # The files differed so we cannot collapse them.
+            log.warn('Paths differ: %s and %s', fpath1, fpath2)
+            if options.verbose and not i.endswith(('.so', '.a')):
+                with open(fpath1) as fp1:
+                    fromlines = fp1.readlines()
+                with open(fpath2) as fp2:
+                    tolines = fp2.readlines()
+                diff = difflib.unified_diff(fromlines, tolines, fpath1, fpath2)
+                sys.stderr.writelines(diff)
+
+    for action, args in cleanup_actions:
+        action(dstdir, *args)
+    try:
+        os.removedirs(srcdir)
+    except OSError:
+        pass
+
+
+## Functions to merge parts of the .dist-info metadata directory together
+
+def missing_lines(src, dst):
+    """Find all the lines in the text file src that are not in dst"""
+    with open(dst) as fh:
+        current = {k: None for k in fh.readlines()}
+
+    missing = []
+    with open(src) as fh:
+        for line in fh.readlines():
+            if line not in current:
+                missing.append(line)
+
+    return missing
+
+
+def merge_WHEEL(src, dst):
+    """Merge the source .dist-info/WHEEL file into the destination
+
+    Note that after editing the WHEEL file, the sha256 included in
+    the .dist-info/RECORD file will be incorrect and will need fixing
+    using the fix_merged_RECORD() function.
+    """
+    log.debug("Merging WHEEL file %s into %s", src, dst)
+    missing = missing_lines(src, dst)
+    with open(dst, "at") as fh:
+        for line in missing:
+            if line.startswith("Tag: "):
+                fh.write(line)
+            else:
+                log.warn("WHEEL merge discarded line %s", line)
+
+    return len(missing)
+
+
+def merge_RECORD(src, dst):
+    """Merge the source .dist-info/RECORD file into the destination"""
+    log.debug("Merging RECORD file %s into %s", src, dst)
+    missing = missing_lines(src, dst)
+
+    with open(dst, "at") as fh:
+        for line in missing:
+            fh.write(line)
+
+    return len(missing)
+
+
+def fix_merged_RECORD(distdir):
+    """Update the checksum for .dist-info/WHEEL in .dist-info/RECORD
+
+    After merging the .dist-info/WHEEL file, the sha256 recorded for it will be
+    wrong in .dist-info/RECORD, so edit that file to ensure that it is fixed.
+    The output is sorted for reproducibility.
+    """
+    log.debug("Fixing RECORD file in %s", distdir)
+    record_path = join(distdir, "RECORD")
+    wheel_path = join(distdir, "WHEEL")
+    wheel_dir = split(split(record_path)[0])[1]
+    wheel_relpath = join(wheel_dir, "WHEEL")
+
+    with open(wheel_path, "rb") as fh:
+        wheel_sha256 = hashlib.sha256(fh.read()).hexdigest();
+    wheel_size = getsize(wheel_path)
+
+    contents = [
+        "{name},sha256={sha256sum},{size}\n".format(
+            name=wheel_relpath,
+            sha256sum=wheel_sha256,
+            size=wheel_size,
+        )]
+    with open(record_path) as fh:
+        for line in fh.readlines():
+            if not line.startswith(wheel_relpath):
+                contents.append(line)
+    # now write out the updated record
+    with open(record_path, "wt") as fh:
+        fh.writelines(sorted(contents))
+
+
+def remove_from_RECORD(distdir, files):
+    """Remove all specified dist-info files from RECORD"""
+    log.debug("Removing %r from RECORD in %s", files, distdir)
+    record = join(distdir, "RECORD")
+    parent_dir = split(distdir)[1]
+    names = [join(parent_dir, name) for name in files]
+    lines = []
+    with open(record) as fh:
+        lines = fh.readlines()
+
+    filtered = [line for line in lines if not line.split(',', 1)[0] in names]
+
+    if lines == filtered:
+        log.warn("Unable to remove %r from RECORD in %s, not found",
+                 files, distdir)
+
+    with open(record, 'wt') as fh:
+        fh.writelines(sorted(filtered))
+
+
+class Scan:
+    UNWANTED_DIRS = re.compile(r'.*/__pycache__(/.*)?$')
+    UNWANTED_FILES = re.compile(r'.*\.py[co]$')
+
+    def __init__(self, interpreter, package, dpath=None, options=None):
+        self.interpreter = interpreter
+        self.impl = interpreter.impl
+
+        self.package = package
+
+        if not dpath:
+            self.proot = "debian/%s" % self.package
+        else:
+            dpath = dpath.strip('/')
+            self.proot = join('debian', self.package, dpath)
+        self.dpath = dpath
+        del dpath
+
+        self.options = options
+        self.result = {'requires.txt': set(),
+                       'egg-info': set(),
+                       'dist-info': set(),
+                       'nsp.txt': set(),
+                       'shebangs': set(),
+                       'public_vers': set(),
+                       'private_dirs': {},
+                       'compile': False,
+                       'ext_vers': set(),
+                       'ext_no_version': set()}
+
+        for root, dirs, file_names in os.walk(self.proot):
+            if interpreter.should_ignore(root):
+                del dirs[:]
+                continue
+
+            self.current_private_dir = self.current_pub_version = None
+            version = interpreter.parse_public_dir(root)
+            if version:
+                self.current_dir_is_public = True
+                if version is True:
+                    version = None
+                else:
+                    self.current_pub_version = version
+            else:
+                self.current_dir_is_public = False
+
+            if self.current_dir_is_public:
+                if root.endswith('-packages'):
+                    if version is not None:
+                        self.result['public_vers'].add(version)
+                    for name in dirs:
+                        if name in ('test', 'tests') or name.startswith('.'):
+                            log.debug('removing dist-packages/%s', name)
+                            rmtree(join(root, name))
+                            dirs.remove(name)
+            else:
+                self.current_private_dir = self.check_private_dir(root)
+                if not self.current_private_dir:
+                    # i.e. not a public dir and not a private dir
+                    if self.is_bin_dir(root):
+                        self.handle_bin_dir(root, file_names)
+                    else:  # not a public, private or bin directory
+                        # continue with a subdirectory
+                        continue
+
+            for name in dirs:
+                dpath = join(root, name)
+                if self.is_unwanted_dir(dpath):
+                    rmtree(dpath)
+                    dirs.remove(name)
+                    continue
+
+            if self.is_dist_dir(root):
+                self.handle_dist_dir(root, file_names)
+                continue
+
+            if self.is_egg_dir(root):
+                self.handle_egg_dir(root, file_names)
+                continue
+
+            # check files
+            for fn in sorted(file_names):
+                # sorted() to make sure .so files are handled before .so.foo
+                fpath = join(root, fn)
+
+                if self.is_unwanted_file(fpath):
+                    log.debug('removing unwanted: %s', fpath)
+                    os.remove(fpath)
+                    continue
+
+                if self.is_egg_file(fpath):
+                    self.handle_egg_file(fpath)
+                    continue
+
+                if not exists(fpath):
+                    # possibly removed while handling .so symlinks
+                    if islink(fpath) and '.so.' in split(fpath)[-1]:
+                        # dangling symlink to (now removed/renamed) .so file
+                        # which wasn't removed yet (see test203's quux.so.0)
+                        log.info('removing dangling symlink: %s', fpath)
+                        os.remove(fpath)
+                    continue
+
+                fext = splitext(fn)[-1][1:]
+                if fext == 'so':
+                    if not self.options.no_ext_rename:
+                        fpath = self.rename_ext(fpath, interpreter, version)
+                    ver = self.handle_ext(fpath)
+                    ver = ver or version
+                    if ver:
+                        self.current_result.setdefault('ext_vers', set()).add(ver)
+                    else:
+                        self.current_result.setdefault('ext_no_version', set()).add(fpath)
+
+                if self.current_private_dir:
+                    if exists(fpath) and fext != 'so':
+                        mode = os.stat(fpath)[ST_MODE]
+                        if mode & S_IXUSR or mode & S_IXGRP or mode & S_IXOTH:
+                            if (options.no_shebang_rewrite or
+                                fix_shebang(fpath, self.options.shebang)) and \
+                                    not self.options.ignore_shebangs:
+                                try:
+                                    res = Interpreter.from_file(fpath)
+                                except Exception as e:
+                                    log.debug('cannot parse shebang %s: %s', fpath, e)
+                                else:
+                                    self.current_result.setdefault('shebangs', set()).add(res)
+
+                if fext == 'py' and self.handle_public_module(fpath) is not False:
+                    self.current_result['compile'] = True
+
+            if not dirs and not self.current_private_dir:
+                try:
+                    os.removedirs(root)
+                except OSError:
+                    pass
+
+        log.debug("package %s details = %s", package, self.result)
+
+    @property
+    def current_result(self):
+        if self.current_private_dir:
+            return self.result['private_dirs'].setdefault(self.current_private_dir, {})
+        return self.result
+
+    def is_unwanted_dir(self, dpath):
+        return self.__class__.UNWANTED_DIRS.match(dpath)
+
+    def is_unwanted_file(self, fpath):
+        if self.__class__.UNWANTED_FILES.match(fpath):
+            return True
+        if self.current_dir_is_public and self.is_dbg_package\
+                and self.options.clean_dbg_pkg\
+                and splitext(fpath)[-1][1:] not in ('so', 'h'):
+            return True
+
+    @property
+    def private_dirs_to_check(self):
+        if self.dpath:
+            # scan private directory *only*
+            return [self.dpath]
+
+        if self.dpath is False:
+            result = []
+        else:
+            result = [i % self.package for i in (
+                      'usr/lib/%s',
+                      'usr/lib/games/%s',
+                      'usr/share/%s',
+                      'usr/share/games/%s')]
+        return result
+
+    @property
+    def is_dbg_package(self):
+        #return self.interpreter.debug
+        return self.package.endswith('-dbg')
+
+    def check_private_dir(self, dpath):
+        """Return private dir's root if it's a private dir."""
+        for i in self.private_dirs_to_check:
+            if dpath.startswith(join('debian', self.package, i)):
+                return '/' + i
+
+    @staticmethod
+    def rename_ext(fpath, interpreter, current_pub_version=None):
+        """Add multiarch triplet, etc. Return new name.
+
+        This method is invoked for all .so files in public or private directories.
+        """
+        # current_pub_version - version parsed from dist-packages (True if unversioned)
+        # i.e. if it's not None - it's a public dist-packages directory
+
+        path, fname = fpath.rsplit('/', 1)
+        if current_pub_version is not None and islink(fpath):
+            # replace symlinks with extensions in dist-packages directory
+            dstfpath = fpath
+            links = set()
+            while islink(dstfpath):
+                links.add(dstfpath)
+                dstfpath = join(path, os.readlink(dstfpath))
+            if exists(dstfpath) and '.so.' in split(dstfpath)[-1]:
+                # rename .so.$FOO symlinks, remove other ones
+                for lpath in links:
+                    log.info('removing symlink: %s', lpath)
+                    os.remove(lpath)
+                log.info('renaming %s to %s', dstfpath, fname)
+                os.rename(dstfpath, fpath)
+
+        if MULTIARCH_DIR_TPL.match(fpath):
+            # ignore /lib/i386-linux-gnu/, /usr/lib/x86_64-kfreebsd-gnu/, etc.
+            return fpath
+
+        new_fn = interpreter.check_extname(fname, current_pub_version)
+        if new_fn:
+            # TODO: what about symlinks pointing to this file
+            new_fpath = join(path, new_fn)
+            if exists(new_fpath):
+                log.warn('destination file exist, '
+                         'cannot rename %s to %s', fname, new_fn)
+            else:
+                log.info('renaming %s to %s', fname, new_fn)
+                os.rename(fpath, new_fpath)
+            return new_fpath
+        return fpath
+
+    def handle_ext(self, fpath):
+        """Handle .so file, return its version if detected."""
+
+    def handle_public_module(self, fpath):
+        pass
+
+    def is_bin_dir(self, dpath):
+        """Check if dir is one from PATH ones."""
+        # dname = debian/packagename/usr/games
+        spath = dpath.strip('/').split('/', 4)
+        if len(spath) > 4:
+            return False  # assume bin directories don't have subdirectories
+        if dpath.endswith(('/sbin', '/bin', '/usr/games')):
+            # /(s)bin or /usr/(s)bin or /usr/games
+            return True
+
+    def handle_bin_dir(self, dpath, file_names):
+        if self.options.no_shebang_rewrite or self.options.ignore_shebangs:
+            return
+        for fn in file_names:
+            fpath = join(dpath, fn)
+            if fix_shebang(fpath, self.options.shebang):
+                try:
+                    res = Interpreter.from_file(fpath)
+                except Exception as e:
+                    log.debug('cannot parse shebang %s: %s', fpath, e)
+                else:
+                    self.result['shebangs'].add(res)
+
+    def is_egg_dir(self, dname):
+        """Check if given directory contains egg-info."""
+        return dname.endswith('.egg-info')
+
+    def handle_egg_dir(self, dpath, file_names):
+        path, dname = dpath.rsplit('/', 1)
+        if self.is_dbg_package and self.options.clean_dbg_pkg:
+            rmtree(dpath)
+            return
+
+        clean_name = clean_egg_name(dname)
+        if clean_name != dname:
+            if exists(join(path, clean_name)):
+                log.info('removing %s (%s is already available)', dname, clean_name)
+                rmtree(dpath)
+                return
+            else:
+                log.info('renaming %s to %s', dname, clean_name)
+                os.rename(dpath, join(path, clean_name))
+                dname = clean_name
+                dpath = join(path, dname)
+        if file_names:
+            if 'requires.txt' in file_names:
+                self.result['requires.txt'].add(join(dpath, 'requires.txt'))
+            if 'namespace_packages.txt' in file_names:
+                self.result['nsp.txt'].add(join(dpath, 'namespace_packages.txt'))
+            if 'SOURCES.txt' in file_names:
+                os.remove(join(dpath, 'SOURCES.txt'))
+                file_names.remove('SOURCES.txt')
+
+    def is_egg_file(self, fpath):
+        """Check if given file contains egg-info."""
+        return fpath.endswith('.egg-info')
+
+    def handle_egg_file(self, fpath):
+        root, name = fpath.rsplit('/', 1)
+        clean_name = clean_egg_name(name)
+        if clean_name != name:
+            if exists(join(root, clean_name)):
+                log.info('removing %s (%s is already available)',
+                         name, clean_name)
+                os.remove(fpath)
+            else:
+                log.info('renaming %s to %s', name, clean_name)
+                os.rename(fpath, join(root, clean_name))
+        self.result['egg-info'].add(join(root, clean_name))
+
+    def is_dist_dir(self, dname):
+        """Check if given directory contains dist-info."""
+        return dname.endswith('.dist-info')
+
+    def handle_dist_dir(self, dpath, file_names):
+        path, dname = dpath.rsplit('/', 1)
+        if self.is_dbg_package and self.options.clean_dbg_pkg:
+            rmtree(dpath)
+            return
+
+        if file_names:
+            if 'METADATA' in file_names:
+                self.result['dist-info'].add(join(dpath, 'METADATA'))
+
+    def cleanup(self):
+        if self.is_dbg_package and self.options.clean_dbg_pkg:
+            # remove empty directories in -dbg packages
+            proot = self.proot + '/usr/lib'
+            for root, dirs, file_names in os.walk(proot, topdown=False):
+                if '-packages/' in root and not file_names:
+                    try:
+                        os.removedirs(root)
+                    except Exception:
+                        pass
diff --git a/dhpython/interpreter.py b/dhpython/interpreter.py
new file mode 100644
index 0000000..021e847
--- /dev/null
+++ b/dhpython/interpreter.py
@@ -0,0 +1,576 @@
+# Copyright © 2012-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import logging
+import os
+import re
+from os.path import exists, join, split
+from dhpython import INTERPRETER_DIR_TPLS, PUBLIC_DIR_RE, OLD_SITE_DIRS
+
+SHEBANG_RE = re.compile(r'''
+    (?:\#!\s*){0,1}  # shebang prefix
+    (?P<path>
+        .*?/bin/.*?)?
+    (?P<name>
+        python|pypy)
+    (?P<version>
+        \d[\.\d]*)?
+    (?P<debug>
+        -dbg)?
+    (?P<options>.*)
+    ''', re.VERBOSE)
+EXTFILE_RE = re.compile(r'''
+    (?P<name>.*?)
+    (?:\.
+        (?P<stableabi>abi\d+)
+     |(?:\.
+        (?P<soabi>
+            (?P<impl>cpython|pypy)
+            -
+            (?P<ver>\d{2,})
+            (?P<flags>[a-z]*)
+        )?
+        (?:
+            (?:(?<!\.)-)?  # minus sign only if soabi is defined
+            (?P<multiarch>[^/]*?)
+        )?
+    ))?
+    (?P<debug>_d)?
+    \.so$''', re.VERBOSE)
+log = logging.getLogger('dhpython')
+
+
+class Interpreter:
+    """
+    :attr path: /usr/bin/ in most cases
+    :attr name: pypy or python (even for python3 and python-dbg) or empty string
+    :attr version: interpreter's version
+    :attr debug: -dbg version of the interpreter
+    :attr impl: implementation (cpytho2, cpython3 or pypy)
+    :attr options: options parsed from shebang
+    :type path: str
+    :type name: str
+    :type version: Version or None
+    :type debug: bool
+    :type impl: str
+    :type options: tuple
+    """
+    path = '/usr/bin/'
+    name = 'python'
+    version = None
+    debug = False
+    impl = ''
+    options = ()
+    _cache = {}
+
+    def __init__(self, value=None, path=None, name=None, version=None,
+                 debug=None, impl=None, options=None):
+        params = locals()
+        del params['self']
+        del params['value']
+
+        if isinstance(value, Interpreter):
+            for key in params.keys():
+                if params[key] is None:
+                    params[key] = getattr(value, key)
+        elif value:
+            if value.replace('.', '').isdigit() and not version:
+                # version string
+                params['version'] = Version(value)
+            else:
+                # shebang or other string
+                for key, val in self.parse(value).items():
+                    # prefer values passed to constructor over shebang ones:
+                    if params[key] is None:
+                        params[key] = val
+
+        for key, val in params.items():
+            if val is not None:
+                setattr(self, key, val)
+            elif key == 'version':
+                setattr(self, key, val)
+
+    def __setattr__(self, name, value):
+        if name == 'name':
+            if value not in ('python', 'pypy', ''):
+                raise ValueError("interpreter not supported: %s" % value)
+            if value == 'python':
+                if self.version:
+                    if self.version.major == 3:
+                        self.__dict__['impl'] = 'cpython3'
+                    else:
+                        self.__dict__['impl'] = 'cpython2'
+            elif value == 'pypy':
+                self.__dict__['impl'] = 'pypy'
+        elif name == 'version' and value is not None:
+            value = Version(value)
+            if not self.impl and self.name == 'python':
+                if value.major == 3:
+                    self.impl = 'cpython3'
+                else:
+                    self.impl = 'cpython2'
+        if name in ('path', 'name', 'impl', 'options') and value is None:
+            pass
+        elif name == 'debug':
+            self.__dict__[name] = bool(value)
+        else:
+            self.__dict__[name] = value
+
+    def __repr__(self):
+        result = self.path
+        if not result.endswith('/'):
+            result += '/'
+        result += self._vstr(self.version)
+        if self.options:
+            result += ' ' + ' '.join(self.options)
+        return result
+
+    def __str__(self):
+        return self._vstr(self.version)
+
+    def _vstr(self, version=None, consider_default_ver=False):
+        if self.impl == 'pypy':
+            # TODO: will Debian support more than one PyPy version?
+            return self.name
+        version = version or self.version or ''
+        if consider_default_ver and (not version or version == self.default_version):
+            version = '3' if self.impl == 'cpython3' else '2'
+        if self.debug:
+            return 'python{}-dbg'.format(version)
+        return self.name + str(version)
+
+    def binary(self, version=None):
+        return '{}{}'.format(self.path, self._vstr(version))
+
+    @property
+    def binary_dv(self):
+        """Like binary(), but returns path to default intepreter symlink
+        if version matches default one for given implementation.
+        """
+        return '{}{}'.format(self.path, self._vstr(consider_default_ver=True))
+
+    @property
+    def default_version(self):
+        if self.impl:
+            return default(self.impl)
+
+    @staticmethod
+    def parse(shebang):
+        """Return dict with parsed shebang
+
+        >>> sorted(Interpreter.parse('/usr/bin/python3.2-dbg').items())
+        [('debug', '-dbg'), ('name', 'python'), ('options', ()), ('path', '/usr/bin/'), ('version', '3.2')]
+        >>> sorted(Interpreter.parse('#! /usr/bin/python3.2').items())
+        [('debug', None), ('name', 'python'), ('options', ()), ('path', '/usr/bin/'), ('version', '3.2')]
+        >>> sorted(Interpreter.parse('/usr/bin/python3.2-dbg --foo --bar').items())
+        [('debug', '-dbg'), ('name', 'python'), ('options', ('--foo', '--bar')),\
+ ('path', '/usr/bin/'), ('version', '3.2')]
+        """
+        result = SHEBANG_RE.search(shebang)
+        if not result:
+            return {}
+        result = result.groupdict()
+        if 'options' in result:
+            # TODO: do we need "--key value" here?
+            result['options'] = tuple(result['options'].split())
+        if result['name'] == 'python' and result['version'] is None:
+            result['version'] = '2'
+        return result
+
+    @classmethod
+    def from_file(cls, fpath):
+        """Read file's shebang and parse it."""
+        interpreter = Interpreter()
+        with open(fpath, 'rb') as fp:
+            data = fp.read(96)
+            if b"\0" in data:
+                raise ValueError('cannot parse binary file')
+        # make sure only first line is checkeed
+        data = str(data, 'utf-8').split('\n')[0]
+        if not data.startswith('#!'):
+            raise ValueError("doesn't look like a shebang: %s" % data)
+
+        parsed = cls.parse(data)
+        if not parsed:
+            raise ValueError("doesn't look like a shebang: %s" % data)
+        for key, val in parsed.items():
+            setattr(interpreter, key, val)
+        return interpreter
+
+    def sitedir(self, package=None, version=None, gdb=False):
+        """Return path to site-packages directory.
+
+        Note that returned path is not the final location of .py files
+
+        >>> i = Interpreter('python')
+        >>> i.sitedir(version='3.1')
+        '/usr/lib/python3/dist-packages/'
+        >>> i.sitedir(version='2.5')
+        '/usr/lib/python2.5/site-packages/'
+        >>> i.sitedir(version=Version('2.7'))
+        '/usr/lib/python2.7/dist-packages/'
+        >>> i.sitedir(version='3.1', gdb=True, package='python3-foo')
+        'debian/python3-foo/usr/lib/debug/usr/lib/python3/dist-packages/'
+        >>> i.sitedir(version=Version('3.2'))
+        '/usr/lib/python3/dist-packages/'
+        """
+        try:
+            version = Version(version or self.version)
+        except Exception as err:
+            raise ValueError("cannot find valid version: %s" % err)
+        if self.impl == 'pypy':
+            path = '/usr/lib/pypy/dist-packages/'
+        elif version << Version('2.6'):
+            path = "/usr/lib/python%s/site-packages/" % version
+        elif version << Version('3.0'):
+            path = "/usr/lib/python%s/dist-packages/" % version
+        else:
+            path = '/usr/lib/python3/dist-packages/'
+
+        if gdb:
+            path = "/usr/lib/debug%s" % path
+        if package:
+            path = "debian/%s%s" % (package, path)
+
+        return path
+
+    def old_sitedirs(self, package=None, version=None, gdb=False):
+        """Return deprecated paths to site-packages directories."""
+        try:
+            version = Version(version or self.version)
+        except Exception as err:
+            raise ValueError("cannot find valid version: %s" % err)
+        result = []
+        for item in OLD_SITE_DIRS.get(self.impl, []):
+            if isinstance(item, str):
+                result.append(item.format(version))
+            else:
+                res = item(version)
+                if res is not None:
+                    result.append(res)
+
+        if gdb:
+            result = ['/usr/lib/debug{}'.format(i) for i in result]
+            if self.impl.startswith('cpython'):
+                result.append('/usr/lib/debug/usr/lib/pyshared/python{}'.format(version))
+        if package:
+            result = ['debian/{}{}'.format(package, i) for i in result]
+
+        return result
+
+    def parse_public_dir(self, path):
+        """Return version assigned to site-packages path
+        or True is it's unversioned public dir."""
+        match = PUBLIC_DIR_RE[self.impl].match(path)
+        if match:
+            vers = match.groups(0)
+            if vers and vers[0]:
+                return Version(vers)
+            return True
+
+    def should_ignore(self, path):
+        """Return True if path is used by another interpreter implementation."""
+        cache_key = 'should_ignore_{}'.format(self.impl)
+        if cache_key not in self.__class__._cache:
+            expr = [v for k, v in INTERPRETER_DIR_TPLS.items() if k != self.impl]
+            regexp = re.compile('|'.join('({})'.format(i) for i in expr))
+            self.__class__._cache[cache_key] = regexp
+        else:
+            regexp = self.__class__._cache[cache_key]
+        return regexp.search(path)
+
+    def cache_file(self, fpath, version=None):
+        """Given path to a .py file, return path to its .pyc/.pyo file.
+
+        This function is inspired by Python 3.2's imp.cache_from_source.
+
+        :param fpath: path to file name
+        :param version: Python version
+
+        >>> i = Interpreter('python')
+        >>> i.cache_file('foo.py', Version('3.1'))
+        'foo.pyc'
+        >>> i.cache_file('bar/foo.py', '3.8')          # doctest: +SKIP
+        'bar/__pycache__/foo.cpython-38.pyc'
+        """
+        version = Version(version or self.version)
+        last_char = 'o' if '-O' in self.options else 'c'
+        if version <= Version('3.1'):
+            return fpath + last_char
+
+        fdir, fname = split(fpath)
+        if not fname.endswith('.py'):
+            fname += '.py'
+        return join(fdir, '__pycache__', "%s.%s.py%s" %
+                    (fname[:-3], self.magic_tag(version), last_char))
+
+    def magic_number(self, version=None):
+        """Return magic number."""
+        version = Version(version or self.version)
+        if self.impl == 'cpython2':
+            return ''
+        result = self._execute('import imp; print(imp.get_magic())', version)
+        return eval(result)
+
+    def magic_tag(self, version=None):
+        """Return Python magic tag (used in __pycache__ dir to tag files).
+
+        >>> i = Interpreter('python')
+        >>> i.magic_tag(version='3.8')                 # doctest: +SKIP
+        'cpython-38'
+        """
+        version = Version(version or self.version)
+        if self.impl.startswith('cpython') and version << Version('3.2'):
+            return ''
+        return self._execute('import imp; print(imp.get_tag())', version)
+
+    def multiarch(self, version=None):
+        """Return multiarch tag."""
+        version = Version(version or self.version)
+        try:
+            soabi, multiarch = self._get_config(version)[:2]
+        except Exception:
+            log.debug('cannot get multiarch', exc_info=True)
+            # interpreter without multiarch support
+            return ''
+        return multiarch
+
+    def stableabi(self, version=None):
+        version = Version(version or self.version)
+        # stable ABI was introduced in Python 3.3
+        if self.impl == 'cpython3' and version >> Version('3.2'):
+            return 'abi{}'.format(version.major)
+
+    def soabi(self, version=None):
+        """Return SOABI flag (used to in .so files)."""
+        version = Version(version or self.version)
+        # NOTE: it's not the same as magic_tag
+        try:
+            soabi, multiarch = self._get_config(version)[:2]
+        except Exception:
+            log.debug('cannot get soabi', exc_info=True)
+            # interpreter without soabi support
+            return ''
+        return soabi
+
+    @property
+    def include_dir(self):
+        """Return INCLUDE_DIR path.
+
+        >>> Interpreter('python2.7').include_dir       # doctest: +SKIP
+        '/usr/include/python2.7'
+        >>> Interpreter('python3.8-dbg').include_dir   # doctest: +SKIP
+        '/usr/include/python3.8d'
+        """
+        if self.impl == 'pypy':
+            return '/usr/lib/pypy/include'
+        try:
+            result = self._get_config()[2]
+            if result:
+                return result
+        except Exception:
+            result = ''
+            log.debug('cannot get include path', exc_info=True)
+        result = '/usr/include/{}'.format(self.name)
+        version = self.version
+        if self.debug:
+            if version >= '3.8':
+                result += 'd'
+            elif version << '3.3':
+                result += '_d'
+            else:
+                result += 'dm'
+        else:
+            if version >= '3.8':
+                pass
+            elif version >> '3.2':
+                result += 'm'
+            elif version == '3.2':
+                result += 'mu'
+        return result
+
+    @property
+    def symlinked_include_dir(self):
+        """Return path to symlinked include directory."""
+        if self.impl in ('cpython2', 'pypy') or self.debug \
+           or self.version >> '3.7' or self.version << '3.3':
+            # these interpreters do not provide symlink,
+            # others provide it in libpython3.X-dev
+            return
+        try:
+            result = self._get_config()[2]
+            if result:
+                if result.endswith('m'):
+                    return result[:-1]
+                else:
+                    # there's include_dir, but no "m"
+                    return
+        except Exception:
+            result = '/usr/include/{}'.format(self.name)
+            log.debug('cannot get include path', exc_info=True)
+        return result
+
+    @property
+    def library_file(self):
+        """Return libfoo.so file path."""
+        if self.impl == 'pypy':
+            return ''
+        libpl, ldlibrary = self._get_config()[3:5]
+        if ldlibrary.endswith('.a'):
+            # python3.1-dbg, python3.2, python3.2-dbg returned static lib
+            ldlibrary = ldlibrary.replace('.a', '.so')
+        if libpl and ldlibrary:
+            return join(libpl, ldlibrary)
+        raise Exception('cannot find library file for {}'.format(self))
+
+    def check_extname(self, fname, version=None):
+        """Return extension file name if file can be renamed."""
+        if not version and not self.version:
+            return
+
+        version = Version(version or self.version)
+
+        if '/' in fname:
+            fdir, fname = fname.rsplit('/', 1)  # in case full path was passed
+        else:
+            fdir = ''
+
+        info = EXTFILE_RE.search(fname)
+        if not info:
+            return
+        info = info.groupdict()
+        if info['ver'] and (not version or version.minor is None):
+            # get version from soabi if version is not set of only major
+            # version number is set
+            version = Version("%s.%s" % (info['ver'][0], info['ver'][1]))
+
+        if info['stableabi']:
+            # files with stable ABI in name don't need changes
+            return
+        if info['debug'] and self.debug is False:
+            # do not change Python 2.X extensions already marked as debug
+            # (the other way around is acceptable)
+            return
+        if info['soabi'] and info['multiarch']:
+            # already tagged, nothing we can do here
+            return
+
+        try:
+            soabi, multiarch = self._get_config(version)[:2]
+        except Exception:
+            log.debug('cannot get soabi/multiarch', exc_info=True)
+            return
+
+        if info['soabi'] and soabi and info['soabi'] != soabi:
+            return
+
+        tmp_soabi = info['soabi'] or soabi
+        tmp_multiarch = info['multiarch'] or multiarch
+
+        result = info['name']
+        if result.endswith('module') and result != 'module' and (
+           self.impl == 'cpython3' and version >> '3.2' or
+           self.impl == 'cpython2' and version == '2.7'):
+            result = result[:-6]
+
+        if tmp_soabi:
+            result = "{}.{}".format(result, tmp_soabi)
+            if tmp_multiarch and not (self.impl == 'cpython3' and version << '3.3') and tmp_multiarch not in soabi:
+                result = "{}-{}".format(result, tmp_multiarch)
+        elif self.impl == 'cpython2' and version == '2.7' and tmp_multiarch:
+            result = "{}.{}".format(result, tmp_multiarch)
+
+        if self.debug and self.impl == 'cpython2':
+            result += '_d'
+        result += '.so'
+        if fname == result:
+            return
+        return join(fdir, result)
+
+    def suggest_pkg_name(self, name):
+        """Suggest binary package name with for given library name
+
+        >>> Interpreter('python3.1').suggest_pkg_name('foo')
+        'python3-foo'
+        >>> Interpreter('python3.8').suggest_pkg_name('foo_bar')
+        'python3-foo-bar'
+        >>> Interpreter('python2.7-dbg').suggest_pkg_name('bar')
+        'python-bar-dbg'
+        """
+        name = name.replace('_', '-')
+        if self.impl == 'pypy':
+            return 'pypy-{}'.format(name)
+        version = '3' if self.impl == 'cpython3' else ''
+        result = 'python{}-{}'.format(version, name)
+        if self.debug:
+            result += '-dbg'
+        return result
+
+    def _get_config(self, version=None):
+        version = Version(version or self.version)
+        # sysconfig module is available since Python 3.2
+        # (also backported to Python 2.7)
+        if self.impl == 'pypy' or self.impl.startswith('cpython') and (
+                version >> '2.6' and version << '3'
+                or version >> '3.1' or version == '3'):
+            cmd = 'import sysconfig as s;'
+        else:
+            cmd = 'from distutils import sysconfig as s;'
+        cmd += 'print("__SEP__".join(i or "" ' \
+               'for i in s.get_config_vars('\
+               '"SOABI", "MULTIARCH", "INCLUDEPY", "LIBPL", "LDLIBRARY")))'
+        conf_vars = self._execute(cmd, version).split('__SEP__')
+        if conf_vars[1] in conf_vars[0]:
+            # Python >= 3.5 includes MILTIARCH in SOABI
+            conf_vars[0] = conf_vars[0].replace("-%s" % conf_vars[1], '')
+        try:
+            conf_vars[1] = os.environ['DEB_HOST_MULTIARCH']
+        except KeyError:
+            pass
+        return conf_vars
+
+    def _execute(self, command, version=None, cache=True):
+        version = Version(version or self.version)
+        exe = "{}{}".format(self.path, self._vstr(version))
+        command = "{} -c '{}'".format(exe, command.replace("'", "\'"))
+        if cache and command in self.__class__._cache:
+            return self.__class__._cache[command]
+        if not exists(exe):
+            raise Exception("cannot execute command due to missing "
+                            "interpreter: %s" % exe)
+
+        output = execute(command)
+        if output['returncode'] != 0:
+            log.debug(output['stderr'])
+            raise Exception('{} failed with status code {}'.format(command, output['returncode']))
+
+        result = output['stdout'].splitlines()
+
+        if len(result) == 1:
+            result = result[0]
+
+        if cache:
+            self.__class__._cache[command] = result
+
+        return result
+
+# due to circular imports issue
+from dhpython.tools import execute
+from dhpython.version import Version, default
diff --git a/dhpython/markers.py b/dhpython/markers.py
new file mode 100644
index 0000000..a0a3e55
--- /dev/null
+++ b/dhpython/markers.py
@@ -0,0 +1,70 @@
+# Copyright © 2022 Stefano Rivera <stefanor@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+"""
+Handle Environment Markers
+https://www.python.org/dev/peps/pep-0508/#environment-markers
+
+TODO: Ideally replace with the packaging library, but the API is currently
+private: https://github.com/pypa/packaging/issues/496
+"""
+
+import re
+
+
+SIMPLE_ENV_MARKER_RE = re.compile(r'''
+    (?P<marker>[a-z_]+)
+    \s*
+    (?P<op><=?|>=?|[=!~]=|===)
+    \s*
+    (?P<quote>['"])
+    (?P<value>.*)  # Could contain additional markers
+    (?P=quote)
+    ''', re.VERBOSE)
+COMPLEX_ENV_MARKER_RE = re.compile(r'''
+    (?:\s|\))
+    (?:and|or)
+    (?:\s|\()
+    ''', re.VERBOSE)
+
+
+class ComplexEnvironmentMarker(Exception):
+    pass
+
+
+def parse_environment_marker(marker):
+    """Parse a simple marker of <= 1 environment restriction"""
+    marker = marker.strip()
+    if marker.startswith('(') and marker.endswith(')'):
+        marker = marker[1:-1].strip()
+
+    m = COMPLEX_ENV_MARKER_RE.search(marker)
+    if m:
+        raise ComplexEnvironmentMarker()
+
+    m = SIMPLE_ENV_MARKER_RE.match(marker)
+    if not m:
+        raise ComplexEnvironmentMarker()
+
+    return (
+        m.group('marker'),
+        m.group('op'),
+        m.group('value'),
+    )
diff --git a/dhpython/option.py b/dhpython/option.py
new file mode 100644
index 0000000..7d70dbe
--- /dev/null
+++ b/dhpython/option.py
@@ -0,0 +1,30 @@
+# -*- coding: UTF-8 -*-
+# Copyright © 2010-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import re
+
+
+def compiled_regex(string):
+    """argparse regex type"""
+    try:
+        return re.compile(string)
+    except re.error:
+        raise ValueError("regular expression is not valid")
diff --git a/dhpython/pydist.py b/dhpython/pydist.py
new file mode 100644
index 0000000..015b5f2
--- /dev/null
+++ b/dhpython/pydist.py
@@ -0,0 +1,692 @@
+# Copyright © 2010-2020 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+
+import email
+import logging
+import platform
+import os
+import re
+from functools import partial
+from os.path import exists, isdir, join
+from subprocess import PIPE, Popen
+
+if __name__ == '__main__':
+    import sys
+    sys.path.append(os.path.abspath(join(os.path.dirname(__file__), '..')))
+
+from dhpython import PKG_PREFIX_MAP, PUBLIC_DIR_RE,\
+    PYDIST_DIRS, PYDIST_OVERRIDES_FNAMES, PYDIST_DPKG_SEARCH_TPLS
+from dhpython.markers import ComplexEnvironmentMarker, parse_environment_marker
+from dhpython.tools import memoize
+from dhpython.version import get_requested_versions, Version
+
+log = logging.getLogger('dhpython')
+
+PYDIST_RE = re.compile(r"""
+    (?P<name>[A-Za-z][A-Za-z0-9_.-]*)            # Python distribution name
+    \s*
+    (?P<vrange>(?:-?\d\.\d+(?:-(?:\d\.\d+)?)?)?) # version range
+    \s*
+    (?P<dependency>(?:[a-z][^;]*)?)              # Debian dependency
+    (?:  # optional upstream version -> Debian version translator
+        ;\s*
+        (?P<standard>PEP386)?                    # PEP-386 mode
+        \s*
+        (?P<rules>(?:s|tr|y).*)?                 # translator rules
+    )?
+    """, re.VERBOSE)
+REQUIRES_RE = re.compile(r'''
+    (?P<name>[A-Za-z][A-Za-z0-9_.-]*)    # Python distribution name
+    \s*
+    (?P<enabled_extras>(?:\[[^\]]*\])?)  # ignored for now
+    \s*
+    \(?  # optional parenthesis
+    (?:  # optional minimum/maximum version
+        (?P<operator><=?|>=?|==|!=|~=)
+        \s*
+        (?P<version>(\w|[-.*])+)
+        (?:  # optional interval minimum/maximum version
+            \s*
+            ,
+            \s*
+            (?P<operator2><=?|>=?|==|!=)
+            \s*
+            (?P<version2>(\w|[-.])+)
+        )?
+    )?
+    \)?  # optional closing parenthesis
+    \s*
+    (?:;  # optional environment markers
+        (?P<environment_marker>.+)
+    )?
+    ''', re.VERBOSE)
+EXTRA_RE = re.compile(r'''
+    ;
+    \s*
+    extra
+    \s*
+    ==
+    \s*
+    (?P<quote>['"])
+    (?P<section>[a-zA-Z0-9-_.]+)
+    (?P=quote)
+    ''', re.VERBOSE)
+REQ_SECTIONS_RE = re.compile(r'''
+    ^
+    \[
+    (?P<section>[a-zA-Z0-9-_.]+)?
+    \s*
+    (?::
+        (?P<environment_marker>.+)
+    )?
+    \]
+    \s*
+    $
+    ''', re.VERBOSE)
+DEB_VERS_OPS = {
+    '==': '=',
+    '<':  '<<',
+    '>':  '>>',
+    '~=': '>=',
+}
+
+
+def validate(fpath):
+    """Check if pydist file looks good."""
+    with open(fpath, encoding='utf-8') as fp:
+        for line in fp:
+            line = line.strip()
+            if line.startswith('#') or not line:
+                continue
+            if not PYDIST_RE.match(line):
+                log.error('invalid pydist data in file %s: %s',
+                          fpath.rsplit('/', 1)[-1], line)
+                return False
+    return True
+
+
+@memoize
+def load(impl):
+    """Load information about installed Python distributions.
+
+    :param impl: interpreter implementation, f.e. cpython2, cpython3, pypy
+    :type impl: str
+    """
+    fname = PYDIST_OVERRIDES_FNAMES.get(impl)
+    if exists(fname):
+        to_check = [fname]  # first one!
+    else:
+        to_check = []
+
+    dname = PYDIST_DIRS.get(impl)
+    if isdir(dname):
+        to_check.extend(join(dname, i) for i in os.listdir(dname))
+
+    fbdir = os.environ.get('DH_PYTHON_DIST', '/usr/share/dh-python/dist/')
+    fbname = join(fbdir, '{}_fallback'.format(impl))
+    if exists(fbname):  # fall back generated at dh-python build time
+        to_check.append(fbname)  # last one!
+
+    result = {}
+    for fpath in to_check:
+        with open(fpath, encoding='utf-8') as fp:
+            for line in fp:
+                line = line.strip()
+                if line.startswith('#') or not line:
+                    continue
+                dist = PYDIST_RE.search(line)
+                if not dist:
+                    raise Exception('invalid pydist line: %s (in %s)' % (line, fpath))
+                dist = dist.groupdict()
+                name = safe_name(dist['name'])
+                dist['versions'] = get_requested_versions(impl, dist['vrange'])
+                dist['dependency'] = dist['dependency'].strip()
+                if dist['rules']:
+                    dist['rules'] = dist['rules'].split(';')
+                else:
+                    dist['rules'] = []
+                result.setdefault(name, []).append(dist)
+    return result
+
+
+def guess_dependency(impl, req, version=None, bdep=None,
+                     accept_upstream_versions=False):
+    bdep = bdep or {}
+    log.debug('trying to find dependency for %s (python=%s)',
+              req, version)
+    if isinstance(version, str):
+        version = Version(version)
+
+    # some upstreams have weird ideas for distribution name...
+    name, rest = re.compile('([^!><=~ \(\)\[;]+)(.*)').match(req).groups()
+    # TODO: check stdlib and dist-packaged for name.py and name.so files
+    req = safe_name(name) + rest
+
+    data = load(impl)
+    req_d = REQUIRES_RE.match(req)
+    if not req_d:
+        log.info('please ask dh_python3 author to fix REQUIRES_RE '
+                 'or your upstream author to fix requires.txt')
+        raise Exception('requirement is not valid: %s' % req)
+    req_d = req_d.groupdict()
+
+    env_marker_alts = ''
+    if req_d['environment_marker']:
+        action = check_environment_marker_restrictions(
+            req,
+            req_d['environment_marker'],
+            impl)
+        if action is False:
+            return
+        elif action is True:
+            pass
+        else:
+            env_marker_alts = ' ' + action
+
+    name = req_d['name']
+    details = data.get(name.lower())
+    if details:
+        log.debug("dependency: module seems to be installed")
+        for item in details:
+            if version and version not in item.get('versions', version):
+                # rule doesn't match version, try next one
+                continue
+            if not item['dependency']:
+                log.debug("dependency: requirement ignored")
+                return  # this requirement should be ignored
+            if item['dependency'].endswith(')'):
+                # no need to translate versions if version is hardcoded in
+                # Debian dependency
+                log.debug("dependency: requirement already has hardcoded version")
+                return item['dependency'] + env_marker_alts
+            if req_d['operator'] == '==' and req_d['version'].endswith('*'):
+                # Translate "== 1.*" to "~= 1.0"
+                req_d['operator'] = '~='
+                req_d['version'] = req_d['version'].replace('*', '0')
+                log.debug("dependency: translated wildcard version to semver limit")
+            if req_d['version'] and (item['standard'] or item['rules']) and\
+                    req_d['operator'] not in (None, '!='):
+                o = _translate_op(req_d['operator'])
+                v = _translate(req_d['version'], item['rules'], item['standard'])
+                d = "%s (%s %s)%s" % (
+                    item['dependency'], o, v, env_marker_alts)
+                if req_d['version2'] and req_d['operator2'] not in (None,'!='):
+                    o2 = _translate_op(req_d['operator2'])
+                    v2 = _translate(req_d['version2'], item['rules'], item['standard'])
+                    d += ", %s (%s %s)%s" % (
+                        item['dependency'], o2, v2, env_marker_alts)
+                elif req_d['operator'] == '~=':
+                    o2 = '<<'
+                    v2 = _translate(_max_compatible(req_d['version']), item['rules'], item['standard'])
+                    d += ", %s (%s %s)%s" % (
+                        item['dependency'], o2, v2, env_marker_alts)
+                log.debug("dependency: constructed version")
+                return d
+            elif accept_upstream_versions and req_d['version'] and \
+                    req_d['operator'] not in (None,'!='):
+                o = _translate_op(req_d['operator'])
+                d = "%s (%s %s)%s" % (
+                    item['dependency'], o, req_d['version'], env_marker_alts)
+                if req_d['version2'] and req_d['operator2'] not in (None,'!='):
+                    o2 = _translate_op(req_d['operator2'])
+                    d += ", %s (%s %s)%s" % (
+                        item['dependency'], o2, req_d['version2'],
+                        env_marker_alts)
+                elif req_d['operator'] == '~=':
+                    o2 = '<<'
+                    d += ", %s (%s %s)%s" % (
+                        item['dependency'], o2,
+                        _max_compatible(req_d['version']), env_marker_alts)
+                log.debug("dependency: constructed upstream version")
+                return d
+            else:
+                if item['dependency'] in bdep:
+                    if None in bdep[item['dependency']] and bdep[item['dependency']][None]:
+                        log.debug("dependency: included in build-deps with limits ")
+                        return "{} ({}){}".format(
+                            item['dependency'], bdep[item['dependency']][None],
+                            env_marker_alts)
+                    # if arch in bdep[item['dependency']]:
+                    # TODO: handle architecture specific dependencies from build depends
+                    #       (current architecture is needed here)
+                log.debug("dependency: included in build-deps")
+                return item['dependency'] + env_marker_alts
+
+    # search for Egg metadata file or directory (using dpkg -S)
+    dpkg_query_tpl, regex_filter = PYDIST_DPKG_SEARCH_TPLS[impl]
+    dpkg_query = dpkg_query_tpl.format(ci_regexp(safe_name(name)))
+
+    log.debug("invoking dpkg -S %s", dpkg_query)
+    process = Popen(('/usr/bin/dpkg', '-S', dpkg_query),
+                    stdout=PIPE, stderr=PIPE)
+    stdout, stderr = process.communicate()
+    if process.returncode == 0:
+        result = set()
+        stdout = str(stdout, 'utf-8')
+        for line in stdout.split('\n'):
+            if not line.strip():
+                continue
+            pkg, path = line.split(':', 1)
+            if regex_filter and not re.search(regex_filter, path):
+                continue
+            result.add(pkg)
+        if len(result) > 1:
+            log.error('more than one package name found for %s dist', name)
+        elif not result:
+            log.debug('dpkg -S did not find package for %s', name)
+        else:
+            log.debug('dependency: found a result with dpkg -S')
+            return result.pop() + env_marker_alts
+    else:
+        log.debug('dpkg -S did not find package for %s: %s', name, stderr)
+
+    pname = sensible_pname(impl, name)
+    log.info('Cannot find package that provides %s. '
+             'Please add package that provides it to Build-Depends or '
+             'add "%s %s" line to %s or add proper '
+             'dependency to Depends by hand and ignore this info.',
+             name, safe_name(name), pname, PYDIST_OVERRIDES_FNAMES[impl])
+    # return pname
+
+
+def check_environment_marker_restrictions(req, marker_str, impl):
+    """Check wither we should include or skip a dependency based on its
+    environment markers.
+
+    Returns: True  - to keep a dependency
+             False - to skip it
+             str   - to append "| foo" to generated dependencies
+    """
+    if impl != 'cpython3':
+        log.info('Ignoring environment markers for non-Python 3.x: %s', req)
+        return False
+
+    try:
+        marker, op, value = parse_environment_marker(marker_str)
+    except ComplexEnvironmentMarker:
+        log.info('Ignoring complex environment marker: %s', req)
+        return False
+
+    # TODO: Use dynamic values when building arch-dependent
+    # binaries, otherwise static values
+    # TODO: Hurd values?
+    supported_values = {
+        'implementation_name': ('cpython', 'pypy'),
+        'os_name': ('posix',),
+        'platform_system': ('GNU/kFreeBSD', 'Linux'),
+        'platform_machine': (platform.machine(),),
+        'platform_python_implementation': ('CPython', 'PyPy'),
+        'sys_platform': (
+            'gnukfreebsd8', 'gnukfreebsd9', 'gnukfreebsd10',
+            'gnukfreebsd11', 'gnukfreebsd12', 'gnukfreebsd13',
+            'linux'),
+    }
+    if marker in supported_values:
+        sv = supported_values[marker]
+        if op in ('==', '!='):
+            if ((op == '==' and value not in sv)
+                    or (op == '!=' and value in sv)):
+                log.debug('Skipping requirement (%s != %s): %s',
+                          value, sv, req)
+                return False
+        else:
+            log.info(
+                'Skipping requirement with unhandled environment marker '
+                'comparison: %s', req)
+            return False
+
+    elif marker in ('python_version', 'python_full_version',
+                        'implementation_version'):
+        # TODO: Replace with full PEP-440 parser
+        env_ver = value
+        split_ver = value.split('.')
+        if marker == 'python_version':
+            version_parts = 2
+        elif marker == 'python_full_version':
+            version_parts = 3
+        else:
+            version_parts = len(split_ver)
+
+        if '*' in env_ver:
+            if split_ver.index('*') != len(split_ver) -1:
+                log.info('Skipping requirement with intermediate wildcard: %s',
+                         req)
+                return False
+            split_ver.pop()
+            env_ver = '.'.join(split_ver)
+            if op == '==':
+                if marker == 'python_full_version':
+                    marker = 'python_version'
+                    version_parts = 2
+                else:
+                    op == '=~'
+            elif op == '!=':
+                if marker == 'python_full_version':
+                    marker = 'python_version'
+                    version_parts = 2
+                else:
+                    log.info('Ignoring wildcard != requirement, not '
+                             'representable in Debian: %s', req)
+                    return True
+            else:
+                log.info('Skipping requirement with %s on a wildcard: %s',
+                         op, req)
+                return False
+
+        int_ver = []
+        for ver_part in split_ver:
+            if ver_part.isdigit():
+                int_ver.append(int(ver_part))
+            else:
+                env_ver = '.'.join(str(x) for x in int_ver)
+                log.info('Truncating unparseable version %s to %s in %s',
+                         value, env_ver, req)
+                break
+
+        if len(int_ver) < version_parts:
+            int_ver.append(0)
+            env_ver += '.0'
+        next_ver = int_ver.copy()
+        next_ver[version_parts - 1] += 1
+        next_ver = '.'.join(str(x) for x in next_ver)
+        prev_ver = int_ver.copy()
+        prev_ver[version_parts - 1] -= 1
+        prev_ver = '.'.join(str(x) for x in prev_ver)
+
+        if op == '<':
+            if int_ver <= [3, 0, 0]:
+                return False
+            return '| python3 (>> {})'.format(env_ver)
+        elif op == '<=':
+            return '| python3 (>> {})'.format(next_ver)
+        elif op == '>=':
+            if int_ver < [3, 0, 0]:
+                return True
+            return '| python3 (<< {})'.format(env_ver)
+        elif op == '>':
+            if int_ver < [3, 0, 0]:
+                return True
+            return '| python3 (<< {})'.format(next_ver)
+        elif op in ('==', '==='):
+            # === is arbitrary equality (PEP 440)
+            if marker == 'python_version' or op == '==':
+                return '| python3 (<< {}) | python3 (>> {})'.format(
+                        env_ver, next_ver)
+            else:
+                log.info(
+                    'Skipping requirement with %s environment marker, cannot '
+                    'model in Debian deps: %s', op, req)
+                return False
+        elif op == '~=':  # Compatible equality (PEP 440)
+            ceq_next_ver = int_ver[:2]
+            ceq_next_ver[1] += 1
+            ceq_next_ver = '.'.join(str(x) for x in ceq_next_ver)
+            return '| python3 (<< {}) | python3 (>> {})'.format(
+                    env_ver, ceq_next_ver)
+        elif op == '!=':
+            log.info('Ignoring != comparison in environment marker, cannot '
+                     'model in Debian deps: %s', req)
+            return True
+
+    elif marker == 'extra':
+        # Handled in section logic of parse_requires_dist()
+        return True
+    else:
+        log.info('Skipping requirement with unknown environment marker: %s',
+                 marker)
+        return False
+    return True
+
+
+def parse_pydep(impl, fname, bdep=None, options=None,
+                depends_sec=None, recommends_sec=None, suggests_sec=None):
+    depends_sec = depends_sec or []
+    recommends_sec = recommends_sec or []
+    suggests_sec = suggests_sec or []
+
+    public_dir = PUBLIC_DIR_RE[impl].match(fname)
+    ver = None
+    if public_dir and public_dir.groups() and len(public_dir.group(1)) != 1:
+        ver = public_dir.group(1)
+
+    guess_deps = partial(guess_dependency, impl=impl, version=ver, bdep=bdep,
+                         accept_upstream_versions=getattr(
+                             options, 'accept_upstream_versions', False))
+
+    result = {'depends': [], 'recommends': [], 'suggests': []}
+    modified = section = False
+    env_action = True
+    processed = []
+    with open(fname, 'r', encoding='utf-8') as fp:
+        for line in fp:
+            line = line.strip()
+            if not line or line.startswith('#'):
+                processed.append(line)
+                continue
+            if line.startswith('['):
+                m = REQ_SECTIONS_RE.match(line)
+                if not m:
+                    log.info('Skipping section %s, unable to parse header',
+                             line)
+                    processed.append(line)
+                    section = object()
+                    continue
+                section = m.group('section')
+                env_action = True
+                if m.group('environment_marker'):
+                    env_action = check_environment_marker_restrictions(
+                        line,
+                        m.group('environment_marker'),
+                        impl)
+                processed.append(line)
+                continue
+            if section:
+                if section in depends_sec:
+                    result_key = 'depends'
+                elif section in recommends_sec:
+                    result_key = 'recommends'
+                elif section in suggests_sec:
+                    result_key = 'suggests'
+                else:
+                    processed.append(line)
+                    continue
+            else:
+                result_key = 'depends'
+
+            dependency = None
+            if env_action:
+                dependency = guess_deps(req=line)
+            if dependency and isinstance(env_action, str):
+                dependency = ', '.join(
+                    part.strip() + ' ' + env_action
+                    for part in dependency.split(','))
+
+            if dependency:
+                result[result_key].append(dependency)
+                modified = True
+            else:
+                processed.append(line)
+    if modified and public_dir:
+        with open(fname, 'w', encoding='utf-8') as fp:
+            fp.writelines(i + '\n' for i in processed)
+    return result
+
+
+def parse_requires_dist(impl, fname, bdep=None, options=None, depends_sec=None,
+                        recommends_sec=None, suggests_sec=None):
+    """Extract dependencies from a dist-info/METADATA file"""
+    depends_sec = depends_sec or []
+    recommends_sec = recommends_sec or []
+    suggests_sec = suggests_sec or []
+
+    public_dir = PUBLIC_DIR_RE[impl].match(fname)
+    ver = None
+    if public_dir and public_dir.groups() and len(public_dir.group(1)) != 1:
+        ver = public_dir.group(1)
+
+    guess_deps = partial(guess_dependency, impl=impl, version=ver, bdep=bdep,
+                         accept_upstream_versions=getattr(
+                             options, 'accept_upstream_versions', False))
+    result = {'depends': [], 'recommends': [], 'suggests': []}
+    section = None
+    with open(fname, 'r', encoding='utf-8') as fp:
+        metadata = email.message_from_string(fp.read())
+    requires = metadata.get_all('Requires-Dist', [])
+    for req in requires:
+        m = EXTRA_RE.search(req)
+        result_key = 'depends'
+        if m:
+            section = m.group('section')
+            if section:
+                if section in depends_sec:
+                    result_key = 'depends'
+                elif section in recommends_sec:
+                    result_key = 'recommends'
+                elif section in suggests_sec:
+                    result_key = 'suggests'
+                else:
+                    continue
+        dependency = guess_deps(req=req)
+        if dependency:
+            result[result_key].append(dependency)
+    return result
+
+
+def safe_name(name):
+    """Emulate distribute's safe_name."""
+    return re.compile('[^A-Za-z0-9.]+').sub('_', name).lower()
+
+
+def sensible_pname(impl, egg_name):
+    """Guess Debian package name from Egg name."""
+    egg_name = safe_name(egg_name).replace('_', '-')
+    if egg_name.startswith('python-'):
+        egg_name = egg_name[7:]
+    return '{}-{}'.format(PKG_PREFIX_MAP[impl], egg_name.lower())
+
+
+def ci_regexp(name):
+    """Return case insensitive dpkg -S regexp."""
+    return ''.join("[%s%s]" % (i.upper(), i) if i.isalpha() else i for i in name.lower())
+
+
+PRE_VER_RE = re.compile(r'[-.]?(alpha|beta|rc|dev|a|b|c)')
+GROUP_RE = re.compile(r'\$(\d+)')
+
+
+def _pl2py(pattern):
+    """Convert Perl RE patterns used in uscan to Python's
+
+    >>> print(_pl2py('foo$3'))
+    foo\g<3>
+    """
+    return GROUP_RE.sub(r'\\g<\1>', pattern)
+
+
+def _max_compatible(version):
+    """Return the maximum version compatible with `version` in PEP440 terms,
+    used by ~= requires version specifiers.
+
+    https://www.python.org/dev/peps/pep-0440/#compatible-release
+
+    >>> _max_compatible('2.2')
+    '3'
+    >>> _max_compatible('1.4.5')
+    '1.5'
+    >>> _max_compatible('1.3.alpha4')
+    '2'
+    >>> _max_compatible('2.1.3.post5')
+    '2.2'
+
+    """
+    v = Version(version)
+    v.serial = None
+    v.releaselevel = None
+    if v.micro is not None:
+        v.micro = None
+        return str(v + 1)
+    v.minor = None
+    return str(v + 1)
+
+
+def _translate(version, rules, standard):
+    """Translate Python version into Debian one.
+
+    >>> _translate('1.C2betac', ['s/c//gi'], None)
+    '1.2beta'
+    >>> _translate('5-fooa1.2beta3-fooD',
+    ...     ['s/^/1:/', 's/-foo//g', 's:([A-Z]):+$1:'], 'PEP386')
+    '1:5~a1.2~beta3+D'
+    >>> _translate('x.y.x.z', ['tr/xy/ab/', 'y,z,Z,'], None)
+    'a.b.a.Z'
+    """
+    for rule in rules:
+        # uscan supports s, tr and y operations
+        if rule.startswith(('tr', 'y')):
+            # Note: no support for escaped separator in the pattern
+            pos = 1 if rule.startswith('y') else 2
+            tmp = rule[pos + 1:].split(rule[pos])
+            version = version.translate(str.maketrans(tmp[0], tmp[1]))
+        elif rule.startswith('s'):
+            # uscan supports: g, u and x flags
+            tmp = rule[2:].split(rule[1])
+            pattern = re.compile(tmp[0])
+            count = 1
+            if tmp[2:]:
+                flags = tmp[2]
+                if 'g' in flags:
+                    count = 0
+                if 'i' in flags:
+                    pattern = re.compile(tmp[0], re.I)
+            version = pattern.sub(_pl2py(tmp[1]), version, count)
+        else:
+            log.warn('unknown rule ignored: %s', rule)
+    if standard == 'PEP386':
+        version = PRE_VER_RE.sub(r'~\g<1>', version)
+    return version
+
+
+def _translate_op(operator):
+    """Translate Python version operator into Debian one.
+
+    >>> _translate_op('==')
+    '='
+    >>> _translate_op('<')
+    '<<'
+    >>> _translate_op('<=')
+    '<='
+    """
+    return DEB_VERS_OPS.get(operator, operator)
+
+
+if __name__ == '__main__':
+    impl = os.environ.get('IMPL', 'cpython3')
+    for i in sys.argv[1:]:
+        if os.path.isfile(i):
+            try:
+                print(', '.join(parse_pydep(impl, i)['depends']))
+            except Exception as err:
+                log.error('%s: cannot guess (%s)', i, err)
+        else:
+            try:
+                print(guess_dependency(impl, i) or '')
+            except Exception as err:
+                log.error('%s: cannot guess (%s)', i, err)
diff --git a/dhpython/tools.py b/dhpython/tools.py
new file mode 100644
index 0000000..512f944
--- /dev/null
+++ b/dhpython/tools.py
@@ -0,0 +1,340 @@
+# -*- coding: UTF-8 -*-
+# Copyright © 2010-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import logging
+import os
+import re
+import locale
+from datetime import datetime
+from glob import glob
+from pickle import dumps
+from shutil import rmtree
+from os.path import exists, getsize, isdir, islink, join, split
+from subprocess import Popen, PIPE
+
+log = logging.getLogger('dhpython')
+EGGnPTH_RE = re.compile(r'(.*?)(-py\d\.\d(?:-[^.]*)?)?(\.egg-info|\.pth)$')
+SHAREDLIB_RE = re.compile(r'NEEDED.*libpython(\d\.\d)')
+
+
+def relpath(target, link):
+    """Return relative path.
+
+    >>> relpath('/usr/share/python-foo/foo.py', '/usr/bin/foo', )
+    '../share/python-foo/foo.py'
+    """
+    t = target.split('/')
+    l = link.split('/')
+    while l and l[0] == t[0]:
+        del l[0], t[0]
+    return '/'.join(['..'] * (len(l) - 1) + t)
+
+
+def relative_symlink(target, link):
+    """Create relative symlink."""
+    return os.symlink(relpath(target, link), link)
+
+
+def move_file(fpath, dstdir):
+    """Move file to dstdir. Works with symlinks (including relative ones)."""
+    if isdir(fpath):
+        dname = split(fpath)[-1]
+        for fn in os.listdir(fpath):
+            move_file(join(fpath, fn), join(dstdir, dname))
+
+    if islink(fpath):
+        dstpath = join(dstdir, split(fpath)[-1])
+        relative_symlink(os.readlink(fpath), dstpath)
+        os.remove(fpath)
+    else:
+        os.rename(fpath, dstdir)
+
+
+def move_matching_files(src, dst, pattern, sub=None, repl=''):
+    """Move files (preserving path) that match given pattern.
+
+    move_matching_files('foo/bar/', 'foo/baz/', 'spam/.*\.so$')
+    will move foo/bar/a/b/c/spam/file.so to foo/baz/a/b/c/spam/file.so
+
+    :param sub: regular expression for path part that will be replaced with `repl`
+    :param repl: replacement for `sub`
+    """
+    match = re.compile(pattern).search
+    if sub:
+        sub = re.compile(sub).sub
+        repl = repl or ''
+    for root, dirs, filenames in os.walk(src):
+        for fn in filenames:
+            spath = join(root, fn)
+            if match(spath):
+                if sub is not None:
+                    spath = sub(repl, spath)
+                dpath = join(dst, relpath(spath, src))
+                os.renames(spath, dpath)
+
+
+def fix_shebang(fpath, replacement=None):
+    """Normalize file's shebang.
+
+    :param replacement: new shebang command (path to interpreter and options)
+    """
+    try:
+        interpreter = Interpreter.from_file(fpath)
+    except Exception as err:
+        log.debug('fix_shebang (%s): %s', fpath, err)
+        return None
+
+    if not replacement and interpreter.version == '2':
+        # we'll drop /usr/bin/python symlink from python package at some point
+        replacement = '/usr/bin/python2'
+        if interpreter.debug:
+            replacement += '-dbg'
+    elif not replacement and interpreter.path != '/usr/bin/':  # f.e. /usr/local/* or */bin/env
+        interpreter.path = '/usr/bin'
+        replacement = repr(interpreter)
+    if replacement:
+        log.info('replacing shebang in %s', fpath)
+        try:
+            with open(fpath, 'rb') as fp:
+                fcontent = fp.readlines()
+        except IOError:
+            log.error('cannot open %s', fpath)
+            return False
+        # do not catch IOError here, the file is zeroed at this stage so it's
+        # better to fail
+        with open(fpath, 'wb') as fp:
+            fp.write(("#! %s\n" % replacement).encode('utf-8'))
+            fp.writelines(fcontent[1:])
+    return True
+
+
+def so2pyver(fpath):
+    """Return libpython version file is linked to or None.
+
+    :rtype: tuple
+    :returns: Python version
+    """
+
+    cmd = "readelf -Wd '%s'" % fpath
+    process = Popen(cmd, stdout=PIPE, shell=True)
+    encoding = locale.getdefaultlocale()[1] or 'utf-8'
+    match = SHAREDLIB_RE.search(str(process.stdout.read(), encoding=encoding))
+    if match:
+        return Version(match.groups()[0])
+
+
+def clean_egg_name(name):
+    """Remove Python version and platform name from Egg files/dirs.
+
+    >>> clean_egg_name('python_pipeline-0.1.3_py3k-py3.1.egg-info')
+    'python_pipeline-0.1.3_py3k.egg-info'
+    >>> clean_egg_name('Foo-1.2-py2.7-linux-x86_64.egg-info')
+    'Foo-1.2.egg-info'
+    """
+    match = EGGnPTH_RE.match(name)
+    if match and match.group(2) is not None:
+        return ''.join(match.group(1, 3))
+    return name
+
+
+def parse_ns(fpaths, other=None):
+    """Parse namespace_packages.txt files."""
+    result = set(other or [])
+    for fpath in fpaths:
+        with open(fpath, 'r', encoding='utf-8') as fp:
+            for line in fp:
+                if line:
+                    result.add(line.strip())
+    return result
+
+
+def remove_ns(interpreter, package, namespaces, versions):
+    """Remove empty __init__.py files for requested namespaces."""
+    if not isinstance(namespaces, set):
+        namespaces = set(namespaces)
+    keep = set()
+    for ns in namespaces:
+        for version in versions:
+            fpath = join(interpreter.sitedir(package, version), *ns.split('.'))
+            fpath = join(fpath, '__init__.py')
+            if not exists(fpath):
+                continue
+            if getsize(fpath) != 0:
+                log.warning('file not empty, cannot share %s namespace', ns)
+                keep.add(ns)
+                break
+
+    # return a set of namespaces that should be handled by pycompile/pyclean
+    result = namespaces - keep
+
+    # remove empty __init__.py files, if available
+    for ns in result:
+        for version in versions:
+            dpath = join(interpreter.sitedir(package, version), *ns.split('.'))
+            fpath = join(dpath, '__init__.py')
+            if exists(fpath):
+                os.remove(fpath)
+                if not os.listdir(dpath):
+                    os.rmdir(dpath)
+        # clean pyshared dir as well
+        dpath = join('debian', package, 'usr/share/pyshared', *ns.split('.'))
+        fpath = join(dpath, '__init__.py')
+        if exists(fpath):
+            os.remove(fpath)
+            if not os.listdir(dpath):
+                os.rmdir(dpath)
+    return result
+
+
+def execute(command, cwd=None, env=None, log_output=None, shell=True):
+    """Execute external shell command.
+
+    :param cdw: current working directory
+    :param env: environment
+    :param log_output:
+        * opened log file or path to this file, or
+        * None if output should be included in the returned dict, or
+        * False if output should be redirected to stdout/stderr
+    """
+    args = {'shell': shell, 'cwd': cwd, 'env': env}
+    close = False
+    if log_output is False:
+        pass
+    elif log_output is None:
+        args.update(stdout=PIPE, stderr=PIPE)
+    elif log_output:
+        if isinstance(log_output, str):
+            close = True
+            log_output = open(log_output, 'a', encoding='utf-8')
+        log_output.write('\n# command executed on {}'.format(datetime.now().isoformat()))
+        log_output.write('\n$ {}\n'.format(command))
+        log_output.flush()
+        args.update(stdout=log_output, stderr=log_output)
+
+    log.debug('invoking: %s', command)
+    with Popen(command, **args) as process:
+        stdout, stderr = process.communicate()
+        close and log_output.close()
+        return dict(returncode=process.returncode,
+                    stdout=stdout and str(stdout, 'utf-8'),
+                    stderr=stderr and str(stderr, 'utf-8'))
+
+
+class memoize:
+    def __init__(self, func):
+        self.func = func
+        self.cache = {}
+
+    def __call__(self, *args, **kwargs):
+        key = dumps((args, kwargs))
+        if key not in self.cache:
+            self.cache[key] = self.func(*args, **kwargs)
+        return self.cache[key]
+
+
+def pyinstall(interpreter, package, vrange):
+    """Install local files listed in pkg.pyinstall files as public modules."""
+    srcfpath = "./debian/%s.pyinstall" % package
+    if not exists(srcfpath):
+        return
+    impl = interpreter.impl
+    versions = get_requested_versions(impl, vrange)
+
+    for line in open(srcfpath, encoding='utf-8'):
+        if not line or line.startswith('#'):
+            continue
+        details = INSTALL_RE.match(line)
+        if not details:
+            raise ValueError("unrecognized line: %s" % line)
+        details = details.groupdict()
+        if details['module']:
+            details['module'] = details['module'].replace('.', '/')
+        myvers = versions & get_requested_versions(impl, details['vrange'])
+        if not myvers:
+            log.debug('%s.pyinstall: no matching versions for line %s',
+                      package, line)
+            continue
+        files = glob(details['pattern'])
+        if not files:
+            raise ValueError("missing file(s): %s" % details['pattern'])
+        for fpath in files:
+            fpath = fpath.lstrip('/.')
+            if details['module']:
+                dstname = join(details['module'], split(fpath)[1])
+            elif fpath.startswith('debian/'):
+                dstname = fpath[7:]
+            else:
+                dstname = fpath
+            for version in myvers:
+                dstfpath = join(interpreter.sitedir(package, version), dstname)
+                dstdir = split(dstfpath)[0]
+                if not exists(dstdir):
+                    os.makedirs(dstdir)
+                if exists(dstfpath):
+                    os.remove(dstfpath)
+                os.link(fpath, dstfpath)
+
+
+def pyremove(interpreter, package, vrange):
+    """Remove public modules listed in pkg.pyremove file."""
+    srcfpath = "./debian/%s.pyremove" % package
+    if not exists(srcfpath):
+        return
+    impl = interpreter.impl
+    versions = get_requested_versions(impl, vrange)
+
+    for line in open(srcfpath, encoding='utf-8'):
+        if not line or line.startswith('#'):
+            continue
+        details = REMOVE_RE.match(line)
+        if not details:
+            raise ValueError("unrecognized line: %s: %s" % (package, line))
+        details = details.groupdict()
+        myvers = versions & get_requested_versions(impl, details['vrange'])
+        if not myvers:
+            log.debug('%s.pyremove: no matching versions for line %s',
+                      package, line)
+        for version in myvers:
+            site_dirs = interpreter.old_sitedirs(package, version)
+            site_dirs.append(interpreter.sitedir(package, version))
+            for sdir in site_dirs:
+                files = glob(sdir + '/' + details['pattern'])
+                for fpath in files:
+                    if isdir(fpath):
+                        rmtree(fpath)
+                    else:
+                        os.remove(fpath)
+
+from dhpython.interpreter import Interpreter
+from dhpython.version import Version, get_requested_versions, RANGE_PATTERN
+INSTALL_RE = re.compile(r"""
+    (?P<pattern>.+?)  # file pattern
+    (?:\s+  # optional Python module name:
+    (?P<module>[A-Za-z][A-Za-z0-9_.]*)?
+    )?
+    \s*  # optional version range:
+    (?P<vrange>%s)?$
+""" % RANGE_PATTERN, re.VERBOSE)
+REMOVE_RE = re.compile(r"""
+    (?P<pattern>.+?)  # file pattern
+    \s*  # optional version range:
+    (?P<vrange>%s)?$
+""" % RANGE_PATTERN, re.VERBOSE)
diff --git a/dhpython/version.py b/dhpython/version.py
new file mode 100644
index 0000000..98c16b7
--- /dev/null
+++ b/dhpython/version.py
@@ -0,0 +1,457 @@
+# Copyright © 2010-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import logging
+import re
+from os.path import exists
+
+from dhpython import _defaults
+
+RANGE_PATTERN = r'(-)?(\d\.\d+)(?:(-)(\d\.\d+)?)?'
+RANGE_RE = re.compile(RANGE_PATTERN)
+VERSION_RE = re.compile(r'''
+    (?P<major>\d+)\.?
+    (?P<minor>\d+)?\.?
+    (?P<micro>\d+)?[.\s]?
+    (?P<releaselevel>alpha|beta|candidate|final)?[.\s]?
+    (?P<serial>\d+)?''', re.VERBOSE)
+
+log = logging.getLogger('dhpython')
+Interpreter = None
+
+
+class Version:
+    # TODO: Upgrade to PEP-440
+    def __init__(self, value=None, major=None, minor=None, micro=None,
+                 releaselevel=None, serial=None):
+        """Construct a new instance.
+
+        >>> Version(major=0, minor=0, micro=0, releaselevel=0, serial=0)
+        Version('0.0')
+        >>> Version('0.0')
+        Version('0.0')
+        """
+        if isinstance(value, (tuple, list)):
+            value = '.'.join(str(i) for i in value)
+        if isinstance(value, Version):
+            for name in ('major', 'minor', 'micro', 'releaselevel', 'serial'):
+                setattr(self, name, getattr(value, name))
+            return
+        comp = locals()
+        del comp['self']
+        del comp['value']
+        if value:
+            match = VERSION_RE.match(value)
+            for name, value in match.groupdict().items() if match else []:
+                if value is not None and comp[name] is None:
+                    comp[name] = value
+        for name, value in comp.items():
+            if name != 'releaselevel' and value is not None:
+                value = int(value)
+            setattr(self, name, value)
+        if self.major is None:
+            raise ValueError('major component is required')
+
+    def __str__(self):
+        """Return major.minor or major string.
+
+        >>> str(Version(major=3, minor=2, micro=1, releaselevel='final', serial=4))
+        '3.2'
+        >>> str(Version(major=2))
+        '2'
+        """
+        result = str(self.major)
+        if self.minor is not None:
+            result += '.{}'.format(self.minor)
+        return result
+
+    def __hash__(self):
+        return hash(repr(self))
+
+    def __repr__(self):
+        """Return full version string.
+
+        >>> repr(Version(major=3, minor=2, micro=1, releaselevel='final', serial=4))
+        "Version('3.2.1.final.4')"
+        >>> repr(Version(major=2))
+        "Version('2')"
+        """
+        result = "Version('{}".format(self)
+        for name in ('micro', 'releaselevel', 'serial'):
+            value = getattr(self, name)
+            if not value:
+                break
+            result += '.{}'.format(value)
+        return result + "')"
+
+    def __add__(self, other):
+        """Return next version.
+
+        >>> Version('3.1') + 1
+        Version('3.2')
+        >>> Version('2') + '1'
+        Version('3')
+        """
+        result = Version(self)
+        if self.minor is None:
+            result.major += int(other)
+        else:
+            result.minor += int(other)
+        return result
+
+    def __sub__(self, other):
+        """Return previous version.
+
+        >>> Version('3.1') - 1
+        Version('3.0')
+        >>> Version('3') - '1'
+        Version('2')
+        """
+        result = Version(self)
+        if self.minor is None:
+            result.major -= int(other)
+            new = result.major
+        else:
+            result.minor -= int(other)
+            new = result.minor
+        if new < 0:
+            raise ValueError('cannot decrease version further')
+        return result
+
+    def __eq__(self, other):
+        try:
+            other = Version(other)
+        except Exception:
+            return False
+        return self.__cmp(other) == 0
+
+    def __lt__(self, other):
+        return self.__cmp(other) < 0
+
+    def __le__(self, other):
+        return self.__cmp(other) <= 0
+
+    def __gt__(self, other):
+        return self.__cmp(other) > 0
+
+    def __ge__(self, other):
+        return self.__cmp(other) >= 0
+
+    def __lshift__(self, other):
+        """Compare major.minor or major only (if minor is not set).
+
+        >>> Version('2.6') << Version('2.7')
+        True
+        >>> Version('2.6') << Version('2.6.6')
+        False
+        >>> Version('3') << Version('2')
+        False
+        >>> Version('3.1') << Version('2')
+        False
+        >>> Version('2') << Version('3.2.1.alpha.3')
+        True
+        """
+        if not isinstance(other, Version):
+            other = Version(other)
+        if self.minor is None or other.minor is None:
+            return self.__cmp(other, ignore='minor') < 0
+        else:
+            return self.__cmp(other, ignore='micro') < 0
+
+    def __rshift__(self, other):
+        """Compare major.minor or major only (if minor is not set).
+
+        >>> Version('2.6') >> Version('2.7')
+        False
+        >>> Version('2.6.7') >> Version('2.6.6')
+        False
+        >>> Version('3') >> Version('2')
+        True
+        >>> Version('3.1') >> Version('2')
+        True
+        >>> Version('2.1') >> Version('3.2.1.alpha.3')
+        False
+        """
+        if not isinstance(other, Version):
+            other = Version(other)
+        if self.minor is None or other.minor is None:
+            return self.__cmp(other, ignore='minor') > 0
+        else:
+            return self.__cmp(other, ignore='micro') > 0
+
+    def __cmp(self, other, ignore=None):
+        if not isinstance(other, Version):
+            other = Version(other)
+        for name in ('major', 'minor', 'micro', 'releaselevel', 'serial'):
+            if name == ignore:
+                break
+            value1 = getattr(self, name) or 0
+            value2 = getattr(other, name) or 0
+            if name == 'releaselevel':
+                rmap = {'alpha': -3, 'beta': -2, 'candidate': -1, 'final': 0}
+                value1 = rmap.get(value1, 0)
+                value2 = rmap.get(value2, 0)
+            if value1 == value2:
+                continue
+            return (value1 > value2) - (value1 < value2)
+        return 0
+
+
+class VersionRange:
+    def __init__(self, value=None, minver=None, maxver=None):
+        if minver:
+            self.minver = Version(minver)
+        else:
+            self.minver = None
+        if maxver:
+            self.maxver = Version(maxver)
+        else:
+            self.maxver = None
+
+        if value:
+            minver, maxver = self.parse(value)
+            if minver and self.minver is None:
+                self.minver = minver
+            if maxver and self.maxver is None:
+                self.maxver = maxver
+
+    def __bool__(self):
+        if self.minver is not None or self.maxver is not None:
+            return True
+        return False
+
+    def __str__(self):
+        """Return version range string from given range.
+
+        >>> str(VersionRange(minver='3.4'))
+        '3.4-'
+        >>> str(VersionRange(minver='3.4', maxver='3.6'))
+        '3.4-3.6'
+        >>> str(VersionRange(minver='3.4', maxver='4.0'))
+        '3.4-4.0'
+        >>> str(VersionRange(maxver='3.7'))
+        '-3.7'
+        >>> str(VersionRange(minver='3.5', maxver='3.5'))
+        '3.5'
+        >>> str(VersionRange())
+        '-'
+        """
+        if self.minver is None is self.maxver:
+            return '-'
+        if self.minver == self.maxver:
+            return str(self.minver)
+        elif self.minver is None:
+            return '-{}'.format(self.maxver)
+        elif self.maxver is None:
+            return '{}-'.format(self.minver)
+        else:
+            return '{}-{}'.format(self.minver, self.maxver)
+
+    def __repr__(self):
+        """Return version range string.
+
+        >>> repr(VersionRange('5.0-'))
+        "VersionRange(minver='5.0')"
+        >>> repr(VersionRange('3.0-3.5'))
+        "VersionRange(minver='3.0', maxver='3.5')"
+        """
+        result = 'VersionRange('
+        if self.minver is not None:
+            result += "minver='{}'".format(self.minver)
+        if self.maxver is not None:
+            result += ", maxver='{}'".format(self.maxver)
+        result = result.replace('(, ', '(')
+        return result + ")"
+
+    @staticmethod
+    def parse(value):
+        """Return minimum and maximum Python version from given range.
+
+        >>> VersionRange.parse('3.0-')
+        (Version('3.0'), None)
+        >>> VersionRange.parse('3.1-3.13')
+        (Version('3.1'), Version('3.13'))
+        >>> VersionRange.parse('3.2-4.0')
+        (Version('3.2'), Version('4.0'))
+        >>> VersionRange.parse('-3.7')
+        (None, Version('3.7'))
+        >>> VersionRange.parse('3.2')
+        (Version('3.2'), Version('3.2'))
+        >>> VersionRange.parse('') == VersionRange.parse('-')
+        True
+        >>> VersionRange.parse('>= 4.0')
+        (Version('4.0'), None)
+        """
+        if value in ('', '-'):
+            return None, None
+
+        match = RANGE_RE.match(value)
+        if not match:
+            try:
+                minv, maxv = VersionRange._parse_pycentral(value)
+            except Exception:
+                raise ValueError("version range is invalid: %s" % value)
+        else:
+            groups = match.groups()
+
+            if list(groups).count(None) == 3:  # only one version is allowed
+                minv = Version(groups[1])
+                return minv, minv
+
+            minv = maxv = None
+            if groups[0]:  # maximum version only
+                maxv = groups[1]
+            else:
+                minv = groups[1]
+                maxv = groups[3]
+
+            minv = Version(minv) if minv else None
+            maxv = Version(maxv) if maxv else None
+
+        if maxv and minv and minv > maxv:
+            raise ValueError("version range is invalid: %s" % value)
+
+        return minv, maxv
+
+    @staticmethod
+    def _parse_pycentral(value):
+        """Parse X-Python3-Version.
+
+        >>> VersionRange._parse_pycentral('>= 3.10')
+        (Version('3.10'), None)
+        >>> VersionRange._parse_pycentral('<< 4.0')
+        (None, Version('4.0'))
+        >>> VersionRange._parse_pycentral('3.1')
+        (Version('3.1'), Version('3.1'))
+        >>> VersionRange._parse_pycentral('3.1, 3.2')
+        (Version('3.1'), None)
+        """
+
+        minv = maxv = None
+        hardcoded = set()
+
+        for item in value.split(','):
+            item = item.strip()
+
+            match = re.match('>=\s*([\d\.]+)', item)
+            if match:
+                minv = match.group(1)
+                continue
+            match = re.match('<<\s*([\d\.]+)', item)
+            if match:
+                maxv = match.group(1)
+                continue
+            match = re.match('^[\d\.]+$', item)
+            if match:
+                hardcoded.add(match.group(0))
+
+        if len(hardcoded) == 1:
+            ver = hardcoded.pop()
+            return Version(ver), Version(ver)
+
+        if not minv and hardcoded:
+            # yeah, no maxv!
+            minv = sorted(hardcoded)[0]
+
+        return Version(minv) if minv else None, Version(maxv) if maxv else None
+
+
+def default(impl):
+    """Return default interpreter version for given implementation."""
+    if impl not in _defaults.DEFAULT:
+        raise ValueError("interpreter implementation not supported: %r" % impl)
+    ver = _defaults.DEFAULT[impl]
+    return Version(major=ver[0], minor=ver[1])
+
+
+def supported(impl):
+    """Return list of supported interpreter versions for given implementation."""
+    if impl not in _defaults.SUPPORTED:
+        raise ValueError("interpreter implementation not supported: %r" % impl)
+    versions = _defaults.SUPPORTED[impl]
+    return [Version(major=v[0], minor=v[1]) for v in versions]
+
+
+def get_requested_versions(impl, vrange=None, available=None):
+    """Return a set of requested and supported Python versions.
+
+    :param impl: interpreter implementation
+    :param available: if set to `True`, return installed versions only,
+        if set to `False`, return requested versions that are not installed.
+        By default returns all requested versions.
+    :type available: bool
+
+    >>> sorted(get_requested_versions('cpython3', '')) == sorted(supported('cpython3'))
+    True
+    >>> sorted(get_requested_versions('cpython3', '-')) == sorted(supported('cpython3'))
+    True
+    >>> get_requested_versions('cpython3', '>= 5.0')
+    set()
+    """
+    if isinstance(vrange, str):
+        vrange = VersionRange(vrange)
+
+    if not vrange:
+        versions = set(supported(impl))
+    else:
+        minv = Version(major=0, minor=0) if vrange.minver is None else vrange.minver
+        maxv = Version(major=99, minor=99) if vrange.maxver is None else vrange.maxver
+        if minv == maxv:
+            versions = set([minv] if minv in supported(impl) else tuple())
+        else:
+            versions = set(v for v in supported(impl) if minv <= v < maxv)
+
+    if available is not None:
+        # to avoid circular imports
+        global Interpreter
+        if Interpreter is None:
+            from dhpython.interpreter import Interpreter
+    if available:
+        interpreter = Interpreter(impl=impl)
+        versions = set(v for v in versions
+                       if exists(interpreter.binary(v)))
+    elif available is False:
+        interpreter = Interpreter(impl=impl)
+        versions = set(v for v in versions
+                       if not exists(interpreter.binary(v)))
+
+    return versions
+
+
+def build_sorted(versions, impl='cpython3'):
+    """Return sorted list of versions in a build friendly order.
+
+    i.e. default version, if among versions, is sorted last.
+
+    >>> build_sorted([(2, 6), (3, 4), default('cpython3'), (3, 6), (2, 7)])[-1] == default('cpython3')
+    True
+    >>> build_sorted(('3.2', (3, 0), '3.1'))
+    [Version('3.0'), Version('3.1'), Version('3.2')]
+    """
+    default_ver = default(impl)
+
+    result = sorted(Version(v) for v in versions)
+    try:
+        result.remove(default_ver)
+    except ValueError:
+        pass
+    else:
+        result.append(default_ver)
+    return result
diff --git a/pybuild b/pybuild
new file mode 100755
index 0000000..849e097
--- /dev/null
+++ b/pybuild
@@ -0,0 +1,602 @@
+#! /usr/bin/python3
+# vim: et ts=4 sw=4
+# Copyright © 2012-2013 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import logging
+import argparse
+import re
+import sys
+from os import environ, getcwd, makedirs, remove
+from os.path import abspath, exists, isdir, join
+from shutil import rmtree
+from tempfile import mkdtemp
+
+INTERP_VERSION_RE = re.compile(r'^python(?P<version>3\.\d+)(?P<dbg>-dbg)?$')
+logging.basicConfig(format='%(levelname).1s: pybuild '
+                           '%(module)s:%(lineno)d: %(message)s')
+log = logging.getLogger('dhpython')
+
+
+def main(cfg):
+    log.debug('cfg: %s', cfg)
+    from dhpython import build, PKG_PREFIX_MAP
+    from dhpython.debhelper import DebHelper, build_options
+    from dhpython.version import Version, build_sorted, get_requested_versions
+    from dhpython.interpreter import Interpreter
+    from dhpython.tools import execute, move_matching_files
+
+    if cfg.list_systems:
+        for name, Plugin in sorted(build.plugins.items()):
+            print(name, '\t', Plugin.DESCRIPTION)
+        exit(0)
+
+    nocheck = False
+    if 'DEB_BUILD_OPTIONS' in environ:
+        nocheck = 'nocheck' in environ['DEB_BUILD_OPTIONS']
+    if not nocheck and 'DEB_BUILD_PROFILES' in environ:
+        nocheck = 'nocheck' in environ['DEB_BUILD_PROFILES']
+
+    env = environ.copy()
+    # set some defaults in environ to make the build reproducible
+    env.setdefault('LC_ALL', 'C.UTF-8')
+    env.setdefault('CCACHE_DIR', abspath('.pybuild/ccache'))
+    env.setdefault('no_proxy', 'localhost')
+    if 'http_proxy' not in env:
+        env['http_proxy'] = 'http://127.0.0.1:9/'
+    elif not env['http_proxy']:
+        del env['http_proxy']  # some tools don't like empty var.
+    if 'https_proxy' not in env:
+        env['https_proxy'] = 'https://127.0.0.1:9/'
+    elif not env['https_proxy']:
+        del env['https_proxy']  # some tools don't like empty var.
+    if 'DEB_PYTHON_INSTALL_LAYOUT' not in env:
+        env['DEB_PYTHON_INSTALL_LAYOUT'] = 'deb'
+
+    arch_data = {}
+    if exists('/usr/bin/dpkg-architecture'):
+        res = execute('/usr/bin/dpkg-architecture')
+        for line in res['stdout'].splitlines():
+            key, value = line.strip().split('=', 1)
+            arch_data[key] = value
+
+        # Set _PYTHON_HOST_PLATFORM to ensure debugging symbols on, f.e. i386
+        # emded a constant name regardless of the 32/64-bit kernel.
+        host_platform = '{DEB_HOST_ARCH_OS}-{DEB_HOST_ARCH}'.format(**arch_data)
+        # it's not called amd64 in Python
+        host_platform = host_platform.replace('amd64', 'x86_64')
+        env.setdefault('_PYTHON_HOST_PLATFORM', host_platform)
+
+        if arch_data['DEB_BUILD_ARCH'] != arch_data['DEB_HOST_ARCH']:
+            # support cross compiling Python 3.X extensions, see #892931
+            env.setdefault('_PYTHON_SYSCONFIGDATA_NAME',
+                           '_sysconfigdata__' + arch_data["DEB_HOST_MULTIARCH"])
+
+    # Selected on command line?
+    selected_plugin = cfg.system
+
+    # Selected by build_dep?
+    if not selected_plugin:
+        dh = DebHelper(build_options())
+        for build_dep in dh.build_depends:
+            if build_dep.startswith('pybuild-plugin-'):
+                selected_plugin = build_dep.split('-', 2)[2]
+                break
+
+    if selected_plugin:
+        certainty = 99
+        Plugin = build.plugins.get(selected_plugin)
+        if not Plugin:
+            log.error('unrecognized build system: %s', selected_plugin)
+            exit(10)
+        plugin = Plugin(cfg)
+        context = {'ENV': env, 'args': {}, 'dir': cfg.dir}
+        plugin.detect(context)
+    else:
+        plugin, certainty, context = None, 0, None
+        for Plugin in build.plugins.values():
+            try:
+                tmp_plugin = Plugin(cfg)
+            except Exception as err:
+                log.warn('cannot initialize %s plugin: %s', Plugin.NAME,
+                         err, exc_info=cfg.verbose)
+                continue
+            tmp_context = {'ENV': env, 'args': {}, 'dir': cfg.dir}
+            tmp_certainty = tmp_plugin.detect(tmp_context)
+            log.debug('Plugin %s: certainty %i', Plugin.NAME, tmp_certainty)
+            if tmp_certainty and tmp_certainty > certainty:
+                plugin, certainty, context = tmp_plugin, tmp_certainty, tmp_context
+        del Plugin
+        if not plugin:
+            log.error('cannot detect build system, please use --system option'
+                      ' or set PYBUILD_SYSTEM env. variable')
+            exit(11)
+
+    if plugin.SUPPORTED_INTERPRETERS is not True:
+        # if versioned interpreter was requested and selected plugin lists
+        # versioned ones as supported: extend list of supported interpreters
+        # with this interpreter
+        tpls = {i for i in plugin.SUPPORTED_INTERPRETERS if '{version}' in i}
+        if tpls:
+            for ipreter in cfg.interpreter:
+                m = INTERP_VERSION_RE.match(ipreter)
+                if m:
+                    ver = m.group('version')
+                    updated = set(tpl.format(version=ver) for tpl in tpls)
+                    updated and plugin.SUPPORTED_INTERPRETERS.update(updated)
+
+    for interpreter in cfg.interpreter:
+        if plugin.SUPPORTED_INTERPRETERS is not True and interpreter not in plugin.SUPPORTED_INTERPRETERS:
+            log.error('interpreter %s not supported by %s', interpreter, plugin)
+            exit(12)
+    log.debug('detected build system: %s (certainty: %s%%)', plugin.NAME, certainty)
+
+    if cfg.detect_only:
+        if not cfg.really_quiet:
+            print(plugin.NAME)
+        exit(0)
+
+    versions = cfg.versions
+    if not versions:
+        if len(cfg.interpreter) == 1:
+            i = cfg.interpreter[0]
+            m = INTERP_VERSION_RE.match(i)
+            if m:
+                log.debug('defaulting to version hardcoded in interpreter name')
+                versions = [m.group('version')]
+            else:
+                IMAP = {v: k for k, v in PKG_PREFIX_MAP.items()}
+                if i in IMAP:
+                    versions = build_sorted(get_requested_versions(
+                        IMAP[i], available=True), impl=IMAP[i])
+                if versions and '{version}' not in i:
+                    versions = versions[-1:]  # last one, the default one
+        if not versions:  # still no luck
+            log.debug('defaulting to all supported Python 3.X versions')
+            versions = build_sorted(get_requested_versions(
+                'cpython3', available=True), impl='cpython3')
+    versions = [Version(v) for v in versions]
+
+    def get_option(name, interpreter=None, version=None, default=None):
+        if interpreter:
+            # try PYBUILD_NAME_python3.3-dbg (or hardcoded interpreter)
+            i = interpreter.format(version=version or '')
+            opt = "PYBUILD_{}_{}".format(name.upper(), i)
+            if opt in environ:
+                return environ[opt]
+            # try PYBUILD_NAME_python3-dbg (if not checked above)
+            if '{version}' in interpreter and version:
+                i = interpreter.format(version=version.major)
+                opt = "PYBUILD_{}_{}".format(name.upper(), i)
+                if opt in environ:
+                    return environ[opt]
+        # try PYBUILD_NAME
+        opt = "PYBUILD_{}".format(name.upper())
+        if opt in environ:
+            return environ[opt]
+        # try command line args
+        return getattr(cfg, name, default) or default
+
+    def get_args(context, step, version, interpreter):
+        i = interpreter.format(version=version)
+        ipreter = Interpreter(i)
+
+        home_dir = [ipreter.impl, str(version)]
+        if ipreter.debug:
+            home_dir.append('dbg')
+        if cfg.name:
+            home_dir.append(cfg.name)
+        if cfg.autopkgtest_only:
+            base_dir = environ.get('AUTOPKGTEST_TMP')
+            if not base_dir:
+                base_dir = mkdtemp(prefix='pybuild-autopkgtest-')
+        else:
+            base_dir = '.pybuild/{}'
+        home_dir = base_dir.format('_'.join(home_dir))
+
+        build_dir = get_option('build_dir', interpreter, version,
+                               default=join(home_dir, 'build'))
+
+        destdir = context['destdir'].format(version=version, interpreter=i)
+        if cfg.name:
+            package = ipreter.suggest_pkg_name(cfg.name)
+        else:
+            package = 'PYBUILD_NAME_not_set'
+        if cfg.name and destdir.rstrip('/').endswith('debian/tmp'):
+            destdir = "debian/{}".format(package)
+        destdir = abspath(destdir)
+
+        args = dict(context['args'])
+        args.update({
+            'package': package,
+            'interpreter': ipreter,
+            'version': version,
+            'args': get_option("%s_args" % step, interpreter, version, ''),
+            'dir': abspath(context['dir'].format(version=version, interpreter=i)),
+            'destdir': destdir,
+            'build_dir': abspath(build_dir.format(version=version, interpreter=i)),
+            # versioned dist-packages even for Python 3.X - dh_python3 will fix it later
+            # (and will have a chance to compare files)
+            'install_dir': get_option('install_dir', interpreter, version,
+                                      '/usr/lib/python{version}/dist-packages'
+                                      ).format(version=version, interpreter=i),
+            'home_dir': abspath(home_dir)})
+        if interpreter == 'pypy':
+            args['install_dir'] = '/usr/lib/pypy/dist-packages/'
+        env = dict(args.get('ENV', {}))
+        pp = env.get('PYTHONPATH', context['ENV'].get('PYTHONPATH'))
+        pp = pp.split(':') if pp else []
+        if step in {'build', 'test', 'autopkgtest'}:
+            if step in {'test', 'autopkgtest'}:
+                args['test_dir'] = join(args['destdir'], args['install_dir'].lstrip('/'))
+                if args['test_dir'] not in pp:
+                    pp.append(args['test_dir'])
+            if args['build_dir'] not in pp:
+                pp.append(args['build_dir'])
+        # cross compilation support for Python 2.x
+        if (version.major == 2 and
+            arch_data.get('DEB_BUILD_ARCH') != arch_data.get('DEB_HOST_ARCH')):
+            pp.insert(0, ('/usr/lib/python{0}/plat-{1[DEB_HOST_MULTIARCH]}'
+                         ).format(version, arch_data))
+        env['PYTHONPATH'] = ':'.join(pp)
+        # cross compilation support for Python <= 3.8 (see above)
+        if version.major == 3:
+            name = '_PYTHON_SYSCONFIGDATA_NAME'
+            value = env.get(name, context['ENV'].get(name, ''))
+            if version << '3.8' and value.startswith('_sysconfigdata_')\
+               and not value.startswith('_sysconfigdata_m'):
+                value = env[name] = "_sysconfigdata_m%s" % value[15:]
+            # update default from main() for -dbg interpreter
+            if value and ipreter.debug and not value.startswith('_sysconfigdata_d'):
+                env[name] = "_sysconfigdata_d%s" % value[15:]
+        args['ENV'] = env
+
+        if not exists(args['build_dir']):
+            makedirs(args['build_dir'])
+
+        return args
+
+    def is_disabled(step, interpreter, version):
+        i = interpreter
+        prefix = "{}/".format(step)
+        disabled = (get_option('disable', i, version) or '').split()
+        for item in disabled:
+            if item in (step, '1'):
+                log.debug('disabling {} step for {} {}'.format(step, i, version))
+                return True
+            if item.startswith(prefix):
+                disabled.append(item[len(prefix):])
+        if i in disabled or str(version) in disabled or \
+                i.format(version=version) in disabled or \
+                i.format(version=version.major) in disabled:
+            log.debug('disabling {} step for {} {}'.format(step, i, version))
+            return True
+        return False
+
+    def run(func, interpreter, version, context):
+        step = func.__func__.__name__
+        args = get_args(context, step, version, interpreter)
+        env = dict(context['ENV'])
+        if 'ENV' in args:
+            env.update(args['ENV'])
+
+        before_cmd = get_option('before_{}'.format(step), interpreter, version)
+        if before_cmd:
+            if cfg.quiet:
+                log_file = join(args['home_dir'], 'before_{}_cmd.log'.format(step))
+            else:
+                log_file = False
+            command = before_cmd.format(**args)
+            log.info(command)
+            output = execute(command, context['dir'], env, log_file)
+            if output['returncode'] != 0:
+                msg = 'exit code={}: {}'.format(output['returncode'], command)
+                raise Exception(msg)
+
+        fpath = join(args['home_dir'], 'testfiles_to_rm_before_install')
+        if step == 'install' and exists(fpath):
+            with open(fpath) as fp:
+                for line in fp:
+                    path = line.strip('\n')
+                    if exists(path):
+                        if isdir(path):
+                            rmtree(path)
+                        else:
+                            remove(path)
+            remove(fpath)
+        result = func(context, args)
+
+        after_cmd = get_option('after_{}'.format(step), interpreter, version)
+        if after_cmd:
+            if cfg.quiet:
+                log_file = join(args['home_dir'], 'after_{}_cmd.log'.format(step))
+            else:
+                log_file = False
+            command = after_cmd.format(**args)
+            log.info(command)
+            output = execute(command, context['dir'], env, log_file)
+            if output['returncode'] != 0:
+                msg = 'exit code={}: {}'.format(output['returncode'], command)
+                raise Exception(msg)
+        return result
+
+    def move_to_ext_destdir(i, version, context):
+        """Move built C extensions from the general destdir to ext_destdir"""
+        args = get_args(context, 'install', version, interpreter)
+        ext_destdir = get_option('ext_destdir', i, version)
+        if ext_destdir:
+            move_matching_files(args['destdir'], ext_destdir,
+                                get_option('ext_pattern', i, version),
+                                get_option('ext_sub_pattern', i, version),
+                                get_option('ext_sub_repl', i, version))
+
+    func = None
+    if cfg.clean_only:
+        func = plugin.clean
+    elif cfg.configure_only:
+        func = plugin.configure
+    elif cfg.build_only:
+        func = plugin.build
+    elif cfg.install_only:
+        func = plugin.install
+    elif cfg.test_only:
+        func = plugin.test
+    elif cfg.autopkgtest_only:
+        func = plugin.test
+    elif cfg.print_args:
+        func = plugin.print_args
+
+    ### one function for each interpreter at a time mode ###
+    if func:
+        step = func.__func__.__name__
+        if step == 'test' and nocheck:
+            exit(0)
+        failure = False
+        for i in cfg.interpreter:
+            ipreter = Interpreter(interpreter.format(version=versions[0]))
+            iversions = build_sorted(versions, impl=ipreter.impl)
+            if '{version}' not in i and len(versions) > 1:
+                log.info('limiting Python versions to %s due to missing {version}'
+                         ' in interpreter string', str(versions[-1]))
+                iversions = versions[-1:]  # just the default or closest to default
+            for version in iversions:
+                if is_disabled(step, i, version):
+                    continue
+                c = dict(context)
+                c['dir'] = get_option('dir', i, version, cfg.dir)
+                c['destdir'] = get_option('destdir', i, version, cfg.destdir)
+                try:
+                    run(func, i, version, c)
+                except Exception as err:
+                    log.error('%s: plugin %s failed with: %s',
+                              step, plugin.NAME, err, exc_info=cfg.verbose)
+                    # try to build/test other interpreters/versions even if
+                    # one of them fails to make build logs more verbose:
+                    failure = True
+                    if step not in ('build', 'test', 'autopkgtest'):
+                        exit(13)
+                if step == 'install':
+                    move_to_ext_destdir(i, version, c)
+        if failure:
+            # exit with a non-zero return code if at least one build/test failed
+            exit(13)
+        exit(0)
+
+    ### all functions for interpreters in batches mode ###
+    try:
+        context_map = {}
+        for i in cfg.interpreter:
+            ipreter = Interpreter(interpreter.format(version=versions[0]))
+            iversions = build_sorted(versions, impl=ipreter.impl)
+            if '{version}' not in i and len(versions) > 1:
+                log.info('limiting Python versions to %s due to missing {version}'
+                         ' in interpreter string', str(versions[-1]))
+                iversions = versions[-1:]  # just the default or closest to default
+            for version in iversions:
+                key = (i, version)
+                if key in context_map:
+                    c = context_map[key]
+                else:
+                    c = dict(context)
+                    c['dir'] = get_option('dir', i, version, cfg.dir)
+                    c['destdir'] = get_option('destdir', i, version, cfg.destdir)
+                    context_map[key] = c
+
+                if not is_disabled('clean', i, version):
+                    run(plugin.clean, i, version, c)
+                if not is_disabled('configure', i, version):
+                    run(plugin.configure, i, version, c)
+                if not is_disabled('build', i, version):
+                    run(plugin.build, i, version, c)
+                if not is_disabled('install', i, version):
+                    run(plugin.install, i, version, c)
+                    move_to_ext_destdir(i, version, c)
+                if not nocheck and not is_disabled('test', i, version):
+                    run(plugin.test, i, version, c)
+    except Exception as err:
+        log.error('plugin %s failed: %s', plugin.NAME, err,
+                  exc_info=cfg.verbose)
+        exit(14)
+
+
+def parse_args(argv):
+    usage = '%(prog)s [ACTION] [BUILD SYSTEM ARGS] [DIRECTORIES] [OPTIONS]'
+    parser = argparse.ArgumentParser(usage=usage)
+    parser.add_argument('-v', '--verbose', action='store_true',
+                        default=environ.get('PYBUILD_VERBOSE') == '1',
+                        help='turn verbose mode on')
+    parser.add_argument('-q', '--quiet', action='store_true',
+                        default=environ.get('PYBUILD_QUIET') == '1',
+                        help='doesn\'t show external command\'s output')
+    parser.add_argument('-qq', '--really-quiet', action='store_true',
+                        default=environ.get('PYBUILD_RQUIET') == '1',
+                        help='be quiet')
+    parser.add_argument('--version', action='version', version='%(prog)s DEVELV')
+
+    action = parser.add_argument_group('ACTION', '''The default is to build,
+        install and test the library using detected build system version by
+        version. Selecting one of following actions, will invoke given action
+        for all versions - one by one - which (contrary to the default action)
+        in some build systems can overwrite previous results.''')
+    action.add_argument('--detect', action='store_true', dest='detect_only',
+                        help='return the name of detected build system')
+    action.add_argument('--clean', action='store_true', dest='clean_only',
+                        help='clean files using auto-detected build system specific methods')
+    action.add_argument('--configure', action='store_true', dest='configure_only',
+                        help='invoke configure step for all requested Python versions')
+    action.add_argument('--build', action='store_true', dest='build_only',
+                        help='invoke build step for all requested Python versions')
+    action.add_argument('--install', action='store_true', dest='install_only',
+                        help='invoke install step for all requested Python versions')
+    action.add_argument('--test', action='store_true', dest='test_only',
+                        help='invoke tests for auto-detected build system')
+    action.add_argument('--autopkgtest', action='store_true', dest='autopkgtest_only',
+                        help='invoke autopkgtests for auto-detected build system')
+    action.add_argument('--list-systems', action='store_true',
+                        help='list available build systems and exit')
+    action.add_argument('--print', action='append', dest='print_args',
+                        help="print pybuild's internal parameters")
+
+    arguments = parser.add_argument_group('BUILD SYSTEM ARGS', '''
+        Additional arguments passed to the build system.
+        --system=custom requires complete command.''')
+    arguments.add_argument('--before-clean', metavar='CMD',
+                           help='invoked before the clean command')
+    arguments.add_argument('--clean-args', metavar='ARGS')
+    arguments.add_argument('--after-clean', metavar='CMD',
+                           help='invoked after the clean command')
+
+    arguments.add_argument('--before-configure', metavar='CMD',
+                           help='invoked before the configure command')
+    arguments.add_argument('--configure-args', metavar='ARGS')
+    arguments.add_argument('--after-configure', metavar='CMD',
+                           help='invoked after the configure command')
+
+    arguments.add_argument('--before-build', metavar='CMD',
+                           help='invoked before the build command')
+    arguments.add_argument('--build-args', metavar='ARGS')
+    arguments.add_argument('--after-build', metavar='CMD',
+                           help='invoked after the build command')
+
+    arguments.add_argument('--before-install', metavar='CMD',
+                           help='invoked before the install command')
+    arguments.add_argument('--install-args', metavar='ARGS')
+    arguments.add_argument('--after-install', metavar='CMD',
+                           help='invoked after the install command')
+
+    arguments.add_argument('--before-test', metavar='CMD',
+                           help='invoked before the test command')
+    arguments.add_argument('--test-args', metavar='ARGS')
+    arguments.add_argument('--after-test', metavar='CMD',
+                           help='invoked after the test command')
+
+    tests = parser.add_argument_group('TESTS', '''\
+        unittest\'s discover is used by default (if available)''')
+    tests.add_argument('--test-nose', action='store_true',
+                       default=environ.get('PYBUILD_TEST_NOSE') == '1',
+                       help='use nose module in --test step')
+    tests.add_argument('--test-nose2', action='store_true',
+                       default=environ.get('PYBUILD_TEST_NOSE2') == '1',
+                       help='use nose2 module in --test step')
+    tests.add_argument('--test-pytest', action='store_true',
+                       default=environ.get('PYBUILD_TEST_PYTEST') == '1',
+                       help='use pytest module in --test step')
+    tests.add_argument('--test-tox', action='store_true',
+                       default=environ.get('PYBUILD_TEST_TOX') == '1',
+                       help='use tox in --test step')
+    tests.add_argument('--test-custom', action='store_true',
+                       default=environ.get('PYBUILD_TEST_CUSTOM') == '1',
+                       help='use custom command in --test step')
+
+    dirs = parser.add_argument_group('DIRECTORIES')
+    dirs.add_argument('-d', '--dir', action='store', metavar='DIR',
+                      default=environ.get('PYBUILD_DIR', getcwd()),
+                      help='source files directory - base for other relative dirs [default: CWD]')
+    dirs.add_argument('--dest-dir', action='store', metavar='DIR', dest='destdir',
+                      default=environ.get('DESTDIR', 'debian/tmp'),
+                      help='destination directory [default: debian/tmp]')
+    dirs.add_argument('--ext-dest-dir', action='store', metavar='DIR', dest='ext_destdir',
+                      default=environ.get('PYBUILD_EXT_DESTDIR'),
+                      help='destination directory for .so files')
+    dirs.add_argument('--ext-pattern', action='store', metavar='PATTERN',
+                      default=environ.get('PYBUILD_EXT_PATTERN', r'\.so(\.[^/]*)?$'),
+                      help='regular expression for files that should be moved'
+                      ' if --ext-dest-dir is set [default: .so files]')
+    dirs.add_argument('--ext-sub-pattern', action='store', metavar='PATTERN',
+                      default=environ.get('PYBUILD_EXT_SUB_PATTERN'),
+                      help='pattern to change --ext-pattern\'s filename or path')
+    dirs.add_argument('--ext-sub-repl', action='store', metavar='PATTERN',
+                      default=environ.get('PYBUILD_EXT_SUB_REPL'),
+                      help='replacement for match from --ext-sub-pattern,'
+                      ' empty string by default')
+    dirs.add_argument('--install-dir', action='store', metavar='DIR',
+                      help='installation directory [default: .../dist-packages]')
+    dirs.add_argument('--name', action='store',
+                      default=environ.get('PYBUILD_NAME'),
+                      help='use this name to guess destination directories')
+
+    limit = parser.add_argument_group('LIMITATIONS')
+    limit.add_argument('-s', '--system',
+                       default=environ.get('PYBUILD_SYSTEM'),
+                       help='select a build system [default: auto-detection]')
+    limit.add_argument('-p', '--pyver', action='append', dest='versions',
+                       help='''build for Python VERSION.
+                               This option can be used multiple times
+                               [default: all supported Python 3.X versions]''')
+    limit.add_argument('-i', '--interpreter', action='append',
+                       help='change interpreter [default: python{version}]')
+    limit.add_argument('--disable', metavar='ITEMS',
+                       help='disable action, interpreter or version')
+
+    args = parser.parse_args()
+    if not args.interpreter:
+        args.interpreter = environ.get('PYBUILD_INTERPRETERS', 'python{version}').split()
+    if not args.versions:
+        args.versions = environ.get('PYBUILD_VERSIONS', '').split()
+    else:
+        # add support for -p `pyversions -rv`
+        versions = []
+        for version in args.versions:
+            versions.extend(version.split())
+        args.versions = versions
+
+    if args.test_nose or args.test_nose2 or args.test_pytest or args.test_tox\
+       or args.test_custom or args.system == 'custom':
+        args.custom_tests = True
+    else:
+        args.custom_tests = False
+
+    return args
+
+
+if __name__ == '__main__':
+    cfg = parse_args(sys.argv)
+    if cfg.really_quiet:
+        cfg.quiet = True
+        log.setLevel(logging.CRITICAL)
+    elif cfg.verbose:
+        log.setLevel(logging.DEBUG)
+    else:
+        log.setLevel(logging.INFO)
+    log.debug('version: DEVELV')
+    log.debug(sys.argv)
+    main(cfg)
+    # let dh/cdbs clean the .pybuild dir
+    # rmtree(join(cfg.dir, '.pybuild'))
diff --git a/pybuild-autopkgtest b/pybuild-autopkgtest
new file mode 100755
index 0000000..5b3af8d
--- /dev/null
+++ b/pybuild-autopkgtest
@@ -0,0 +1,68 @@
+#! /usr/bin/env perl
+# vim: et ts=4 sw=4
+# Copyright © 2021 Antonio Terceiro <terceiro@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+use strict;
+use warnings;
+use File::Basename;
+use File::Temp qw( tempdir );
+use Debian::Debhelper::Buildsystem::pybuild;
+use Debian::Debhelper::Dh_Lib qw(doit);
+
+sub main {
+    my $tmpdir = tempdir( CLEANUP => 1);
+    my $run = "${tmpdir}/run";
+    open(RUN, ">", $run) or die($!);
+    print(RUN "#!/usr/bin/make -f\n");
+    print(RUN "include debian/rules\n");
+    print(RUN "pybuild-autopkgtest:\n");
+    printf(RUN "\tpybuild-autopkgtest\n");
+    close(RUN);
+    chmod(0755, $run);
+    $ENV{PYBUILD_AUTOPKGTEST} = "1";
+    if (system("grep -q ^before-pybuild-autopkgtest: debian/rules") == 0) {
+        doit($run, "before-pybuild-autopkgtest");
+    }
+    doit($run, "pybuild-autopkgtest");
+    if (system("grep -q ^after-pybuild-autopkgtest: debian/rules") == 0) {
+        doit($run, "after-pybuild-autopkgtest");
+    }
+}
+
+sub child {
+    # The child inherits the environment defined in debian/rules
+    my $dh = Debian::Debhelper::Buildsystem::pybuild->new();
+    foreach my $command ($dh->pybuild_commands('autopkgtest')) {
+        doit(@$command);
+    }
+}
+
+if (scalar(@ARGV) > 0) {
+    my $prog = basename($0);
+    print STDERR "usage: ${prog}\n";
+    exit(1);
+}
+
+if (defined $ENV{PYBUILD_AUTOPKGTEST}) {
+    child;
+} else {
+    main;
+}
diff --git a/pybuild-autopkgtest.rst b/pybuild-autopkgtest.rst
new file mode 100644
index 0000000..76da53d
--- /dev/null
+++ b/pybuild-autopkgtest.rst
@@ -0,0 +1,109 @@
+=====================
+ pybuild-autopkgtest
+=====================
+
+----------------------------------------------------------------------------------------------------
+invokes the test suite against requested Python versions and installed packages
+----------------------------------------------------------------------------------------------------
+
+:Manual section: 1
+:Author: Antonio Terceiro, 2021
+
+SYNOPSIS
+========
+  pybuild-autopkgtest
+
+OPTIONS
+=======
+
+`pybuild-autopkgtest` takes no options or arguments. All configuration is done
+via the same mechanisms you use to control `pybuild` itself, namely by having
+build dependencies on the right packages, or by setting `PYBUILD_*` environment
+variables in `debian/rules`.
+
+DESCRIPTION
+===========
+
+`pybuild-autopkgtest` is an autopkgtest test runner that reuses all the
+`pybuild` infrastructure to run tests against installed packages, as expected
+by autopkgtest. To enable `pybuild-autopkgtest` for your package, you need to
+add **Testsuite: autopkgtest-pkg-pybuild** to the source stanza in
+`debian/control`. This will cause autodep8(1) to produce the correct contents
+for `debian/tests/control`.
+
+`pybuild-autopkgtest` will run the tests in exactly the same way as `pybuild`
+will during the build, with the exception that the tests are not run in the
+build directory. The test files are copied to a temporary directory, so that
+the tests will run against the installed Python modules, and not against
+anything in the source tree.
+
+All the pybuild infrastructure is used, so for most packages you don't need to
+add any extra code configure for `pybuild-autopkgtest`. For example, just
+having a `python3-pytest` as a build dependency is enough to make the test
+runner use `pytest` to run the tests.
+
+The tests are executed via a temporary makefile that includes `debian/rules`
+from the package, so that any environment variables defined there will also be
+available during autopkgtest, including but not limited to `PYBUILD_*`
+variables for configuring the behavior of `pybuild` itself.
+
+ADOPTING PYBUILD-AUTOPKGTEST
+============================
+
+Since `pybuild-autopkgtest` reuses environment variables set in `debian/rules`,
+migrating packages to use `pybuild-autopkgtest` should not require much effort.
+
+You might have a `debian/tests/control` that duplicates what
+`pybuild-autopkgtest` already does, e.g. copying the test files to a temporary
+directory, changing to it, and running the tests from there. Such test entries
+can usually be removed in favor of adding **Testsuite:
+autopkgtest-pkg-pybuild** to `debian/control`.
+
+In general, you want to move any test-related command line arguments to pybuild
+into environment variables in `debian/rules`.
+
+You can also have specialized, manually-written test cases, alongside the ones
+autogenerated by `autodep8`. For this, both set **Testsuite:
+autopkgtest-pkg-pybuild** in `debian/control` and keep your custom tests in
+`debian/tests/control`.
+
+VARYING BEHAVIOR UNDER AUTOPKGTEST
+==================================
+
+Ideally, the behavior of the tests should be the same during the build and
+under autopkgtest, except for the fact that during autopkgtest the tests should
+load the code from the installed package. `pybuild-autopkgtest` should do this
+correctly most of the time.
+
+There are situations, however, in which you need a slightly different behavior
+during the autopkgtest run. There are a few mechanisms to support that:
+
+- `pybuild-autopkgtest` sets the `PYBUILD_AUTOPKGTEST` environment variable to
+  `1` during the test run. This way, you can add conditional behavior in
+  `debian/rules`.
+- Before and after running the tests, `pybuild-autopkgtest` will call the
+  `debian/rules` targets `before-pybuild-autopkgtest` and
+  `after-pybuild-autopkgtest`, respectively, if they exist.
+
+SAMPLE TEST CONTROL FILE
+========================
+
+The control file produced by autodep8(1) looks like this::
+
+    Test-Command: pybuild-autopkgtest
+    Depends: @, @builddeps@,
+    Restrictions: allow-stderr, skippable,
+    Features: test-name=pybuild-autopkgtest
+
+You should never need to hardcode this in `debian/tests/control`. You can add
+extra items to `Restrictions` and `Depends` by providing a configuration file
+for `autodep8` (`debian/tests/autopkgtest-pkg-pybuild.conf`) like this::
+
+    extra_depends=foo, bar
+    extra_restrictions=isolation-container, breaks-testbed
+
+SEE ALSO
+========
+* pybuild(1)
+* autopkgtest(1)
+* autodep8(1)
diff --git a/pybuild.rst b/pybuild.rst
new file mode 100644
index 0000000..f60db1f
--- /dev/null
+++ b/pybuild.rst
@@ -0,0 +1,306 @@
+=========
+ pybuild
+=========
+
+----------------------------------------------------------------------------------------------------
+invokes various build systems for requested Python versions in order to build modules and extensions
+----------------------------------------------------------------------------------------------------
+
+:Manual section: 1
+:Author: Piotr Ożarowski, 2012-2019
+
+SYNOPSIS
+========
+  pybuild [ACTION] [BUILD SYSTEM ARGUMENTS] [DIRECTORIES] [OPTIONS]
+
+DEBHELPER COMMAND SEQUENCER INTEGRATION
+=======================================
+* build depend on `dh-python`,
+* build depend on all supported Python interpreters, pybuild will use it to create
+  a list of interpreters to build for.  
+  Recognized dependencies:
+
+   - `python3-all-dev` - for Python extensions that work with Python 3.X interpreters,
+   - `python3-all-dbg` - as above, add this one if you're building -dbg packages,
+   - `python3-all` - for Python modules that work with Python 3.X interpreters,
+   - `python3-dev` - builds an extension for default Python 3.X interpreter
+     (useful for private extensions, use python3-all-dev for public ones),
+   - `python3` - as above, used if headers files are not needed to build private module,
+
+* add `--buildsystem=pybuild` to dh's arguments in debian/rules,
+* if more than one binary package is build:
+  add debian/python3-foo.install files, or
+  `export PYBUILD_NAME=modulename` (modulename will be used to guess binary
+  package prefixes), or
+  `export PYBUILD_DESTDIR` env. variables in debian/rules
+* add `--with=python3` to dh's arguments in debian/rules
+  (see proper helper's manpage for more details) or add `dh-sequence-python3`
+  to Build-Depends
+
+debian/rules file example::
+
+ #! /usr/bin/make -f
+ export PYBUILD_NAME=foo
+ %:
+  	dh $@ --with python3 --buildsystem=pybuild
+
+OPTIONS
+=======
+  Most options can be set (in addition to command line) via environment
+  variables. PyBuild will check:
+
+  * PYBUILD_OPTION_VERSIONED_INTERPRETER (f.e. PYBUILD_CLEAN_ARGS_python3.2)
+  * PYBUILD_OPTION_INTERPRETER (f.e. PYBUILD_CONFIGURE_ARGS_python3-dbg)
+  * PYBUILD_OPTION (f.e. PYBUILD_INSTALL_ARGS)
+
+optional arguments
+------------------
+  -h, --help            show this help message and exit
+  -v, --verbose         turn verbose mode on
+  -q, --quiet           doesn't show external command's output
+  -qq, --really-quiet   be quiet
+  --version             show program's version number and exit
+
+ACTION
+------
+  The default is to build, install and test the library using detected build
+  system version by version. Selecting one of following actions, will invoke
+  given action for all versions - one by one - which (contrary to the default
+  action) in some build systems can overwrite previous results.
+
+    --detect
+        return the name of detected build system
+    --clean
+        clean files using auto-detected build system specific methods
+    --configure
+        invoke configure step for all requested Python versions
+    --build
+        invoke build step for all requested Python versions
+    --install
+        invoke install step for all requested Python versions
+    --test
+        invoke tests for auto-detected build system
+    --list-systems
+        list available build systems and exit
+    --print
+        print pybuild's internal parameters
+
+TESTS
+-----
+    unittest's discover from standard library is used in test step by default.
+
+    --test-nose
+        use nose module in test step, remember to add python-nose and/or
+        python3-nose to Build-Depends
+    --test-nose2
+        use nose2 module in test step, remember to add python-nose2 and/or
+        python3-nose2 to Build-Depends
+    --test-pytest
+        use pytest module in test step, remember to add python-pytest and/or
+        python3-pytest to Build-Depends
+    --test-tox
+        use tox command in test step, remember to add tox
+        to Build-Depends. Requires tox.ini file
+    --test-custom
+	use a custom command in the test step. The full test command is then
+	specified with `--test-args` or by setting the `PYBUILD_TEST_ARGS`
+	environment variable. Remember to add any needed packages to run the
+	tests to Build-Depends.
+
+
+testfiles
+~~~~~~~~~
+    Tests are invoked from within build directory to make sure newly built
+    files are tested instead of source files. If test suite requires other files
+    in this directory, you can list them in `debian/pybuild.testfiles` file
+    (you can also use `debian/pybuild_pythonX.testfiles` or
+    `debian/pybuild_pythonX.Y.testfiles`) and files listed there will be copied
+    before test step and removed before install step.
+    By default only `test` and `tests` directories are copied to build directory.
+
+BUILD SYSTEM ARGUMENTS
+----------------------
+  Additional arguments passed to the build system.
+  --system=custom requires complete command in --foo-args parameters.
+
+    --before-clean COMMAND
+        invoked before the clean command
+    --clean-args ARGUMENTS
+        arguments added to clean command generated by build system plugin
+    --after-clean COMMAND
+        invoked after the clean command
+    --before-configure COMMAND
+        invoked before the configure command
+    --configure-args ARGUMENTS
+        arguments added to configure command generated by build system plugin
+    --after-configure COMMAND
+        invoked after the configure command
+    --before-build COMMAND
+        invoked before the build command
+    --build-args ARGUMENTS
+        arguments added to build command generated by build system plugin
+    --after-build COMMAND
+        invoked after the build command
+    --before-install COMMAND
+        invoked before the install command
+    --install-args ARGUMENTS
+        arguments added to install command generated by build system plugin
+    --after-install COMMAND
+        invoked after the install command
+    --before-test COMMAND
+        invoked before the test command
+    --test-args ARGUMENTS
+        arguments added to test command generated by build system plugin
+    --after-test COMMAND
+        invoked after the test command
+
+variables that can be used in `ARGUMENTS` and `COMMAND`
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+* `{version}` will be replaced with current Python version,
+  you can also use `{version.major}`, `{version.minor}`, etc.
+* `{interpreter}` will be replaced with current interpreter,
+  you can also use `{interpreter.include_dir}`
+* `{dir}` will be replaced with sources directory,
+* `{destdir}` will be replaced with destination directory,
+* `{home_dir}` will be replaced with temporary HOME directory,
+  where plugins can keep their data
+  (.pybuild/interpreter_version/ by default),
+* `{build_dir}` will be replaced with build directory
+* `{install_dir}` will be replaced with install directory.
+* `{package}` will be replaced with suggested package name,
+  if --name (or PYBUILD_NAME) is set to `foo`, this variable
+  will be replaced with `python3-foo`.
+
+DIRECTORIES
+-----------
+  -d DIR, --dir DIR
+      set source files directory - base for other relative dirs
+      [by default: current working directory]
+  --dest-dir DIR
+      set destination directory [default: debian/tmp]
+  --ext-dest-dir DIR
+      set destination directory for .so files
+  --ext-pattern PATTERN
+      regular expression for files that should be moved if --ext-dest-dir is set
+      [default: `\.so(\.[^/]*)?$`]
+  --ext-sub-pattern PATTERN
+      regular expression for part of path/filename matched in --ext-pattern
+      that should be removed or replaced with --ext-sub-repl
+  --ext-sub-repl PATTERN
+      replacement for matches in --ext-sub-pattern
+  --install-dir DIR
+      set installation directory [default: .../dist-packages]
+  --name NAME
+      use this name to guess destination directories
+      ("foo" sets debian/python3-foo)
+      This overrides --dest-dir.
+
+variables that can be used in `DIR`
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+* `{version}` will be replaced with current Python version,
+* `{interpreter}` will be replaced with selected interpreter.
+
+LIMITATIONS
+-----------
+  -s SYSTEM, --system SYSTEM
+	select a build system [default: auto-detection]
+  -p VERSIONS, --pyver VERSIONS
+        build for Python VERSIONS. This option can be used multiple times.
+        Versions can be separated by space character.
+        The default is all Python 3.X supported versions.
+  -i INTERPRETER, --interpreter INTERPRETER
+	change interpreter [default: python{version}]
+  --disable ITEMS
+        disable action, interpreter, version or any mix of them.
+        Note that f.e. python3 and python3-dbg are two different interpreters,
+        --disable test/python3 doesn't disable python3-dbg's tests.
+
+disable examples
+~~~~~~~~~~~~~~~~
+* `--disable test/python3.9-dbg` - disables tests for python3.9-dbg
+* `--disable '3.8 3.9'` - disables all actions for version 3.8 and 3.9
+* `PYBUILD_DISABLE=python3.9` - disables all actions for Python 3.9
+* `PYBUILD_DISABLE_python3.3=test` - disables tests for Python 3.3
+* `PYBUILD_DISABLE=test/python3.3` - same as above
+* `PYBUILD_DISABLE=configure/python3 3.2` - disables configure
+  action for all python3 interpreters, and all actions for version 3.2
+
+
+PLUGINS
+-------
+pybuild supports multiple build system plugins.  By default it is
+automatically selected.  These systems are currently supported::
+
+* distutils (most commonly used)
+* cmake
+* flit (deprecated)
+* pyproject
+* custom
+
+flit plugin
+~~~~~~~~~~~
+The flit plugin is deprecated, please use the pyproject plugin instead.
+
+The flit plugin can be used to build Debian packages based on PEP 517
+metadata in `pyproject.toml` when flit is the upstream build system.  These
+can be identified by the presence of a `build-backend = "flit_core.buildapi"`
+element in `pyproject.toml`.  The flit plugin only supports python3.  To use
+this plugin::
+
+* build depend on `flit` and either
+* build depend on `python3-tomli` so flit can be automatically selected or
+* add `export PYBUILD_SYSTEM=flit` to debian/rules to manually select
+
+debian/rules file example::
+
+    #! /usr/bin/make -f
+    export PYBUILD_NAME=foo
+    export PYBUILD_SYSTEM=flit (needed if python3-tomli is not installed)
+    %:
+    	dh $@ --with python3 --buildsystem=pybuild
+
+pyproject
+~~~~~~~~~
+The pyproject plugin drives the new PEP-517 standard interface for
+building Python packages, upstream. This is configured via
+`pyproject.toml`.
+This plugin is expected to replace the distutils and flit plugins in the
+future.
+The entry points generated by the package are created during the build step
+(other plugins make the entry points during the install step); the entry
+points are available in PATH during the test step, permitting them to be
+called from tests.
+
+To use this plugin:
+
+* build depend on `pybuild-plugin-pyproject` as well as any build tools
+  specified by upstream in `pyproject.toml`.
+
+ENVIRONMENT
+===========
+
+As described above in OPTIONS, pybuild can be configured by `PYBUILD_`
+prefixed environment variables.
+
+Tests are skipped if `nocheck` is in the `DEB_BUILD_OPTIONS` or
+`DEB_BUILD_PROFILES` environment variables.
+
+`DESTDIR` provides a default a default value to the `--dest-dir` option.
+
+Pybuild will export `http_proxy=http://127.0.0.1:9/`,
+`https_proxy=https://127.0.0.1:9/`, and `no_proxy=localhost` to
+hopefully block attempts by the package's build-system to access the
+Internet.
+If network access to a loopback interface is needed and blocked by this,
+export empty `http_proxy` and `https_proxy` variables before calling
+pybuild.
+
+If not set, `LC_ALL`, `CCACHE_DIR`, `DEB_PYTHON_INSTALL_LAYOUT`,
+`_PYTHON_HOST_PLATFORM`, `_PYTHON_SYSCONFIGDATA_NAME`, will all be set
+to appropriate values, before calling the package's build script.
+
+SEE ALSO
+========
+* dh_python3(1)
+* https://wiki.debian.org/Python/Pybuild
+* http://deb.li/pybuild - most recent version of this document
diff --git a/pydist/Makefile b/pydist/Makefile
new file mode 100644
index 0000000..2932a45
--- /dev/null
+++ b/pydist/Makefile
@@ -0,0 +1,18 @@
+#!/usr/bin/make -f
+
+FALLBACK_FLAGS = $(shell dpkg-vendor --is ubuntu && echo '--ubuntu')
+
+all: cpython3_fallback README.PyDist.html
+
+clean:
+	rm -rf cache
+	#rm -f dist_fallback
+	rm -f README.PyDist.html
+
+cpython3_fallback:
+	python3 ./generate_fallback_list.py $(FALLBACK_FLAGS)
+
+README.PyDist.html: README.PyDist
+	rst2html $< $@
+
+.PHONY: clean
diff --git a/pydist/README.PyDist b/pydist/README.PyDist
new file mode 100644
index 0000000..dad3853
--- /dev/null
+++ b/pydist/README.PyDist
@@ -0,0 +1,112 @@
+============
+PyDist files
+============
+
+DISTNAME [VRANGE] [DEPENDENCY][; [PEP386] [RULES]]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+PyDist files help tools like dh_python3 to translate Python dependencies
+(from setup.py's install_requires or egg's requires.txt file) to Debian
+dependencies if given Python distribution file / directory is not installed
+(hint: add proper package to Build-Depends and PyDist file might not be needed)
+or if detection is not correct.
+
+Before checking for package that provides installed egg-info file or directory
+dh_python3 is checking these locations for overrides:
+
+ * debian/py3dist-overrides
+ * /usr/share/python3/dist/*
+ * /usr/share/dh-python/dist/cpython3_fallback
+
+debian/python3-foo.pydist is copied into /usr/share/python3/dist/ automatically.
+
+*NOTE:* There's no need to add an override if build-depending on a package that
+provides searched egg-info results in correctly recognized dependency.
+
+Required fields:
+~~~~~~~~~~~~~~~~
+
+DISTNAME
+````````
+Python distribution name (you can find it at the beginning of .egg-info
+file/directory name that your package provides).
+
+Examples:
+ * SQLAlchemy
+ * Jinja2
+ * numpy
+
+
+Optional fields:
+~~~~~~~~~~~~~~~~
+
+VRANGE
+``````
+Python version or version range the line applies to.
+
+Examples:
+ * 2.6		(Python 2.6 only)
+ * 2.5-		(Python 2.5 and newer)
+ * 2.5-2.7	(Python 2.5 or 2.6)
+ * -2.7		(Python 2.6 or older)
+
+ * 3.1		(Python 3.1 only)
+ * 3.1-		(Python 3.1 and newer)
+ * 3.1-3.3	(Python 3.1 or 3.2)
+ * -3.4		(Python 3.3 or older)
+
+DEPENDENCY
+``````````
+Debian dependency, multiple packages or versions are allowed.
+If not set, given Python distribution name will be ignored.
+
+Examples:
+ * python-mako
+ * python-jinja2 | python (>= 2.6)
+ * python-sqlalchemy (>= 0.5), python-sqlalchemy (<< 0.6)
+
+ * python3-mako
+ * python3-jinja2 | python3 (>= 3.0)
+ * python3-sqlalchemy (>= 0.5), python3-sqlalchemy (<< 0.6)
+
+PEP386
+``````
+Standards flag: upstream uses versioning schema described in PEP 386.
+
+RULES
+`````
+Rules needed to translate upstream version to Debian one. If PEP386 is
+set, its rules will be applied later. Multiple rules are allowed, separate them
+with a space.
+
+Examples:
+ * s/^/2:/
+ * s/alpha/~alpha/ s/^/1:/
+
+
+Notes:
+~~~~~~
+
+You can use multiple lines if binary package provides more than one Python
+distribution or if you want to specify different dependencies for each Python
+version or version range.
+
+If you use dh_python3, it will install debian/binary_package_name.pydist file
+to /usr/share/dh-python/dist/cpython3/binary_package_name automatically.
+
+
+Complete examples:
+~~~~~~~~~~~~~~~~~~
+ * SQLAlchemy python-sqlalchemy (>= 0.5), python-sqlalchemy (<< 0.6)
+ * Mako python-mako; PEP386
+ * foo -2.5 python-oldfoo; s/^/3:/
+ * foo 2.5- python-foo; PEP386
+ * Bar 2.6-
+
+ * SQLAlchemy python3-sqlalchemy (>= 0.5), python3-sqlalchemy (<< 0.6)
+ * Mako python3-mako; PEP386
+ * foo -3.2 python3-oldfoo; s/^/3:/
+ * foo 3.2- python3-foo; PEP386
+ * Bar 2.6-
+
+.. vim: ft=rst
diff --git a/pydist/cpython3_fallback b/pydist/cpython3_fallback
new file mode 100644
index 0000000..263cae2
--- /dev/null
+++ b/pydist/cpython3_fallback
@@ -0,0 +1,5173 @@
+2ping 2ping
+APScheduler python3-apscheduler
+AnyQt python3-anyqt
+Arpeggio python3-arpeggio
+Arriero arriero
+Authlib python3-authlib
+Automat python3-automat
+BTrees python3-btrees
+BUSCO busco
+Babel python3-babel
+BabelGladeExtractor python3-babelgladeextractor
+Beaker python3-beaker
+Biosig python3-biosig
+Bootstrap_Flask python3-flask-bootstrap
+Bottleneck python3-bottleneck
+Brian2 python3-brian
+Brlapi python3-brlapi
+Brotli python3-brotli
+BuildStream python3-buildstream
+BuildStream_external python3-bst-external
+CAI python3-cai
+CCColUtils python3-cccolutils
+CDApplet cairo-dock-dbus-plug-in-interface-python
+CDBashApplet cairo-dock-dbus-plug-in-interface-python
+CMOR python3-cmor
+CNVkit cnvkit
+CSXCAD python3-openems
+CT3 python3-cheetah
+CTDopts python3-ctdopts
+CXX python3-cxx-dev
+CacheControl python3-cachecontrol
+CairoSVG python3-cairosvg
+Cartopy python3-cartopy
+Cerberus python3-cerberus
+Cerealizer python3-cerealizer
+Chameleon python3-chameleon
+CheMPS2 python3-chemps2
+CherryPy python3-cherrypy3
+ClusterShell python3-clustershell
+CommonMark_bkrs python3-commonmark-bkrs
+ConfigArgParse python3-configargparse
+ConsensusCore python3-pbconsensuscore
+Cython cython3
+DBussy python3-dbussy
+DNApi python3-dnapilib
+DSV python3-dsv
+DateTimeRange python3-datetimerange
+Decopy decopy
+DendroPy python3-dendropy
+Deprecated python3-deprecated
+DisplayCAL displaycal
+Distance python3-distance
+Django python3-django
+DoubleRatchet python3-doubleratchet
+EXtra_data python3-extra-data
+EasyProcess python3-easyprocess
+EbookLib python3-ebooklib
+Editobj3 python3-editobj3
+EditorConfig python3-editorconfig
+Electrum python3-electrum
+Endgame_Singularity singularity
+ExifRead python3-exifread
+Extractor python3-extractor
+Faker python3-fake-factory
+FinalCif finalcif
+Fiona python3-fiona
+Flask python3-flask
+Flask_API python3-flask-api
+Flask_AppBuilder python3-flask-appbuilder
+Flask_AutoIndex python3-flask-autoindex
+Flask_Babel python3-flask-babel
+Flask_BabelEx python3-flask-babelex
+Flask_BasicAuth python3-flask-basicauth
+Flask_Bcrypt python3-flask-bcrypt
+Flask_Caching python3-flask-caching
+Flask_Compress python3-flask-compress
+Flask_Cors python3-flask-cors
+Flask_FlatPages python3-flask-flatpages
+Flask_Gravatar python3-flask-gravatar
+Flask_HTMLmin python3-flask-htmlmin
+Flask_HTTPAuth python3-flask-httpauth
+Flask_JWT_Extended python3-python-flask-jwt-extended
+Flask_JWT_Simple python3-flask-jwt-simple
+Flask_LDAPConn python3-flask-ldapconn
+Flask_Limiter python3-flask-limiter
+Flask_Login python3-flask-login
+Flask_Mail python3-flask-mail
+Flask_Migrate python3-flask-migrate
+Flask_OpenID python3-flask-openid
+Flask_Paranoid python3-flask-paranoid
+Flask_Principal python3-flask-principal
+Flask_RESTful python3-flask-restful
+Flask_SQLAlchemy python3-flask-sqlalchemy
+Flask_Security_Too python3-flask-security
+Flask_Seeder python3-flask-seeder
+Flask_Session python3-flask-session
+Flask_Silk python3-flask-silk
+Flask_SocketIO python3-flask-socketio
+Flask_Sockets python3-flask-sockets
+Flask_Testing python3-flask-testing
+Flask_WTF python3-flaskext.wtf
+Flor python3-flor
+FormEncode python3-formencode
+Frozen_Flask python3-frozen-flask
+FsQuota python3-fsquota
+GDAL python3-gdal
+GaussSum gausssum
+GenX python3-genx
+GenomeTools python3-genometools
+Genshi python3-genshi
+GeoAlchemy2 python3-geoalchemy2
+GeoIP python3-geoip
+Geophar geophar
+GitPython python3-git
+GladTeX python3-gleetex
+Glances glances
+Glymur python3-glymur
+GooCalendar python3-goocalendar
+Grammalecte_fr python3-grammalecte
+GridDataFormats python3-griddataformats
+Gyoto python3-gyoto
+HTSeq python3-htseq
+HeapDict python3-heapdict
+HyperKitty python3-django-hyperkitty
+IMDbPY python3-imdbpy
+IPy python3-ipy
+InSilicoSeq insilicoseq
+Isenkram isenkram-cli
+IsoSpecPy python3-isospec
+JACK_Client python3-jack-client
+JCC python3-jcc
+JPype1 python3-jpype
+JUBE jube
+Jinja2 python3-jinja2
+Kaptive kaptive
+Keras python3-keras
+Keras_Applications python3-keras-applications
+Keras_Preprocessing python3-keras-preprocessing
+Kivy python3-kivy
+Kleborate kleborate
+Kyoto_Cabinet python3-kyotocabinet
+LEPL python3-lepl
+Lektor lektor
+LibAppArmor python3-libapparmor
+LinkChecker linkchecker
+Logbook python3-logbook
+Loom brz-loom
+M2Crypto python3-m2crypto
+MACS2 macs
+MDAnalysis python3-mdanalysis
+MDP python3-mdp
+MIDIUtil python3-midiutil
+MMLlib python3-mmllib
+MPD_sima mpd-sima
+MacSyFinder macsyfinder
+Magics python3-magics++
+Magnus magnus
+Mako python3-mako
+ManimPango python3-manimpango
+MapProxy python3-mapproxy
+Markdown python3-markdown
+MarkupPy python3-markuppy
+MarkupSafe python3-markupsafe
+Markups python3-markups
+Mastodon.py python3-mastodon
+MechanicalSoup python3-mechanicalsoup
+MetaPhlAn metaphlan
+MicrobeGPS microbegps
+MiniMock python3-minimock
+Mirage mirage
+Mnemosyne mnemosyne
+MontagePy python3-montagepy
+Mopidy mopidy
+Mopidy_ALSAMixer mopidy-alsamixer
+Mopidy_Beets mopidy-beets
+Mopidy_InternetArchive mopidy-internetarchive
+Mopidy_Local mopidy-local
+Mopidy_MPD mopidy-mpd
+Mopidy_MPRIS mopidy-mpris
+Mopidy_Podcast mopidy-podcast
+Mopidy_Podcast_iTunes mopidy-podcast-itunes
+Mopidy_Scrobbler mopidy-scrobbler
+Mopidy_SomaFM mopidy-somafm
+Mopidy_SoundCloud mopidy-soundcloud
+Mopidy_TuneIn mopidy-tunein
+Mopidy_dLeyna mopidy-dleyna
+Morfessor python3-morfessor
+MutatorMath python3-mutatormath
+NanoFilt nanofilt
+NanoLyse nanolyse
+NanoSV nanosv
+NanoStat python3-nanostat
+NeXus python3-nxs
+Nik4 nik4
+Nuitka nuitka
+OBITools obitools
+OMEMO python3-omemo
+OWSLib python3-owslib
+OdooRPC python3-odoorpc
+Oldmemo python3-oldmemo
+Onionbalance onionbalance
+OpenLP openlp
+OpenMM python3-simtk
+OptimiR optimir
+PAM python3-pam
+PGPy python3-pgpy
+PHCpy python3-phcpy
+POT python3-pot
+PTable python3-ptable
+Pallets_Sphinx_Themes python3-pallets-sphinx-themes
+ParmEd python3-parmed
+Parsley python3-parsley
+Paste python3-paste
+PasteDeploy python3-pastedeploy
+PasteScript python3-pastescript
+Pattern python3-pattern
+PeachPy python3-peachpy
+PeakUtils python3-peakutils
+Pebble python3-pebble
+PeptideBuilder python3-peptidebuilder
+Pillow python3-pil
+Pint python3-pint
+Pivy python3-pivy
+Plinth freedombox
+Pmw python3-pmw
+Printrun printrun-common
+ProDy python3-prody
+Protego python3-protego
+PsychoPy psychopy
+PuLP python3-pulp
+Pweave python3-pweave
+Py3ODE python3-pyode
+PyAVM python3-pyavm
+PyAudio python3-pyaudio
+PyBindGen python3-pybindgen
+PyBluez python3-bluez
+PyChess pychess
+PyChromecast python3-pychromecast
+PyCifRW python3-pycifrw
+PyDispatcher python3-pydispatch
+PyDrive2 python3-pydrive2
+PyGObject python3-gi
+PyGithub python3-github
+PyGnuplot python3-pygnuplot
+PyGreSQL python3-pygresql
+PyHamcrest python3-hamcrest
+PyHoca_CLI pyhoca-cli
+PyHoca_GUI pyhoca-gui
+PyICU python3-icu
+PyJWT python3-jwt
+PyKCS11 python3-pykcs11
+PyKMIP python3-pykmip
+PyLD python3-pyld
+PyMca5 python3-pymca5
+PyMeasure python3-pymeasure
+PyMeeus python3-pymeeus
+PyMemoize python3-memoize
+PyMuPDF python3-fitz
+PyMySQL python3-pymysql
+PyNLPl python3-pynlpl
+PyNN python3-pynn
+PyNaCl python3-nacl
+PyNamecheap python3-namecheap
+PyOpenGL python3-opengl
+PyPrind python3-pyprind
+PyPump python3-pypump
+PyQRCode python3-pyqrcode
+PyQSO pyqso
+PyQt5 python3-pyqt5
+PyQt5_sip python3-pyqt5.sip
+PyQt6 python3-pyqt6
+PyQt6_QScintilla python3-pyqt6.qsci
+PyQt6_WebEngine python3-pyqt6.qtwebengine
+PyQt6_sip python3-pyqt6.sip
+PyQtWebEngine python3-pyqt5.qtwebengine
+PyQt_Qwt python3-pyqt5.qwt
+PyQt_builder python3-pyqtbuild
+PyRSS2Gen python3-pyrss2gen
+PySDL2 python3-sdl2
+PySPH python3-pysph
+PySimpleSOAP python3-pysimplesoap
+PySocks python3-socks
+PyStaticConfiguration python3-staticconf
+PyStemmer python3-stemmer
+PyTrie python3-trie
+PyUtilib python3-pyutilib
+PyVCF python3-vcf
+PyVISA python3-pyvisa
+PyVISA_py python3-pyvisa-py
+PyVirtualDisplay python3-pyvirtualdisplay
+PyWavefront python3-pywavefront
+PyWavelets python3-pywt
+PyWebDAV3 python3-webdav
+PyX python3-pyx
+PyXRD python3-pyxrd
+PyYAML python3-yaml
+PyZoltan python3-pyzoltan
+Pygments python3-pygments
+Pymacs pymacs
+Pyment python3-pyment
+Pympler python3-pympler
+Pypubsub python3-pubsub
+Pyro4 python3-pyro4
+PythonQwt python3-qwt
+QDarkStyle python3-qdarkstyle
+QScintilla python3-pyqt5.qsci
+QtAwesome python3-qtawesome
+QtPy python3-qtpy
+Quamash python3-quamash
+QuantLib quantlib-python
+ROPGadget python3-ropgadget
+RPi.bme280 python3-bme280
+Radicale python3-radicale
+ReParser python3-reparser
+Recoll python3-recoll
+Ren_Py python3-renpy
+RestrictedPython python3-restrictedpython
+Routes python3-routes
+Rtree python3-rtree
+RunSnakeRun runsnakerun
+Rx python3-rx
+SCons scons
+SPARQLWrapper python3-sparqlwrapper
+SQLAlchemy python3-sqlalchemy
+SQLAlchemy_Utc python3-sqlalchemy-utc
+SQLAlchemy_Utils python3-sqlalchemy-utils
+SQLAlchemy_i18n python3-sqlalchemy-i18n
+SQLObject python3-sqlobject
+SaltPyLint python3-saltpylint
+SciPy python3-scipy
+Scrapy python3-scrapy
+SecretStorage python3-secretstorage
+SecureString python3-securestring
+Send2Trash python3-send2trash
+Shapely python3-shapely
+Shredder rmlint-gui
+SimPy python3-simpy
+SimpleTAL python3-simpletal
+SocksipyChain python3-socksipychain
+SoftLayer python3-softlayer
+Sonata sonata
+SquareMap python3-squaremap
+Stetl python3-stetl
+Sublist3r sublist3r
+Supysonic supysonic
+TPOT python3-tpot
+Telethon python3-telethon
+Tempita python3-tempita
+Theano python3-theano
+TkinterTreectrl python3-tktreectrl
+Trac trac
+Trololio python3-trololio
+Twisted python3-twisted
+Twomemo python3-twomemo
+TxSNI python3-txsni
+URLObject python3-urlobject
+Unidecode python3-unidecode
+UnknownHorizons unknown-horizons
+UpSetPlot python3-upsetplot
+VF_1 vf1
+VMDKstream python3-vmdkstream
+VirtualMailManager vmm
+WALinuxAgent waagent
+WSGIProxy2 python3-wsgiproxy
+WSME python3-wsme
+WTForms python3-wtforms
+WTForms_Alchemy python3-wtforms-alchemy
+WTForms_Components python3-wtforms-components
+WTForms_JSON python3-wtforms-json
+WTForms_Test python3-wtforms-test
+Wand python3-wand
+WebOb python3-webob
+WebTest python3-webtest
+Werkzeug python3-werkzeug
+Whoosh python3-whoosh
+Wikkid python3-wikkid
+Willow python3-willow
+X3DH python3-x3dh
+XEdDSA python3-xeddsa
+XRStools python3-xrstools
+XStatic python3-xstatic
+XStatic_Angular python3-xstatic-angular
+XStatic_Angular_Bootstrap python3-xstatic-angular-bootstrap
+XStatic_Angular_Cookies python3-xstatic-angular-cookies
+XStatic_Angular_FileUpload python3-xstatic-angular-fileupload
+XStatic_Angular_Gettext python3-xstatic-angular-gettext
+XStatic_Angular_Mock python3-xstatic-angular-mock
+XStatic_Angular_Schema_Form python3-xstatic-angular-schema-form
+XStatic_Angular_UUID python3-xstatic-angular-uuid
+XStatic_Angular_Vis python3-xstatic-angular-vis
+XStatic_Angular_lrdragndrop python3-xstatic-angular-lrdragndrop
+XStatic_Bootstrap_Datepicker python3-xstatic-bootstrap-datepicker
+XStatic_Bootstrap_SCSS python3-xstatic-bootstrap-scss
+XStatic_D3 python3-xstatic-d3
+XStatic_Dagre python3-xstatic-dagre
+XStatic_Dagre_D3 python3-xstatic-dagre-d3
+XStatic_FileSaver python3-xstatic-filesaver
+XStatic_Font_Awesome python3-xstatic-font-awesome
+XStatic_Graphlib python3-xstatic-graphlib
+XStatic_Hogan python3-xstatic-hogan
+XStatic_JQuery.Bootstrap.Wizard python3-xstatic-jquery.bootstrap.wizard
+XStatic_JQuery.TableSorter python3-xstatic-jquery.tablesorter
+XStatic_JQuery.quicksearch python3-xstatic-jquery.quicksearch
+XStatic_JQuery_Migrate python3-xstatic-jquery-migrate
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+lazygal lazygal
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+license_expression python3-license-expression
+lift lift
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+limnoria limnoria
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+linetable python3-linetable
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+lios lios
+liquidctl liquidctl
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+litecli litecli
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+lookatme lookatme
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+lti python3-lti
+lttnganalyses python3-lttnganalyses
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+lttoolbox python3-lttoolbox
+luckyLUKS luckyluks
+ludev_t ludevit
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+lybniz lybniz
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+magic_wormhole magic-wormhole
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+magic_wormhole_transit_relay magic-wormhole-transit-relay
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+mailer python3-mailer
+mailman mailman3
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+makefun python3-makefun
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+mantis_xray mantis-xray
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+mapdamage mapdamage
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+marathon python3-marathon
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+mkdocs mkdocs
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+mkdocstrings mkdocstrings
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+modem_cmd modem-cmd
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+music python3-music
+musicbrainzngs python3-musicbrainzngs
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+mycli mycli
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+netaddr python3-netaddr
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+networking_l2gw python3-networking-l2gw
+networking_mlnx python3-networking-mlnx
+networking_sfc python3-networking-sfc
+networkx python3-networkx
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+neutron_ha_tool neutron-ha-tool
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+neutron_vpnaas_dashboard python3-neutron-vpnaas-dashboard
+nextstrain_augur augur
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+nodeenv nodeenv
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+npm2deb npm2deb
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+numpydoc python3-numpydoc
+numpysane python3-numpysane
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+nyx nyx
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+odfpy python3-odf
+odoo odoo-14
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+ofxstatement ofxstatement
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+ofxstatement_betterment ofxstatement-plugins
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+ofxstatement_consors ofxstatement-plugins
+ofxstatement_czech ofxstatement-plugins
+ofxstatement_dab ofxstatement-plugins
+ofxstatement_de_ing ofxstatement-plugins
+ofxstatement_de_triodos ofxstatement-plugins
+ofxstatement_fineco ofxstatement-plugins
+ofxstatement_germany_1822direkt ofxstatement-plugins
+ofxstatement_germany_postbank ofxstatement-plugins
+ofxstatement_intesasp ofxstatement-plugins
+ofxstatement_is_arionbanki ofxstatement-plugins
+ofxstatement_iso20022 ofxstatement-plugins
+ofxstatement_lansforsakringar ofxstatement-plugins
+ofxstatement_latvian ofxstatement-plugins
+ofxstatement_lfs ofxstatement-plugins
+ofxstatement_lithuanian ofxstatement-plugins
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+ofxstatement_postfinance ofxstatement-plugins
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+ofxstatement_russian ofxstatement-plugins
+ofxstatement_seb ofxstatement-plugins
+ofxstatement_simple ofxstatement-plugins
+ofxstatement_unicreditcz ofxstatement-plugins
+ognibuild ognibuild
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+omgifol python3-omg
+onboard onboard
+onedrivesdk python3-onedrivesdk
+onetimepass python3-onetimepass
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+onionprobe onionprobe
+onionshare onionshare
+onionshare_cli onionshare-cli
+onnx python3-onnx
+ont_fast5_api ont-fast5-api
+ont_tombo tombo
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+openMotor openmotor
+openTSNE python3-opentsne
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+openpaperwork_core openpaperwork-core
+openpaperwork_gtk openpaperwork-gtk
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+openshift python3-openshift
+openshot_qt openshot-qt
+openslide_python python3-openslide
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+openstack_heat python3-heat
+openstack_placement python3-placement
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+openstacksdk python3-openstacksdk
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+opentimestamps python3-opentimestamps
+opentracing python3-opentracing
+openturns python3-openturns
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+opgpcard opgpcard
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+optuna python3-optuna
+oracledb python3-oracledb
+orbit_predictor python3-orbit-predictor
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+os_brick python3-os-brick
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+os_collect_config python3-os-collect-config
+os_faults python3-os-faults
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+os_refresh_config python3-os-refresh-config
+os_resource_classes python3-os-resource-classes
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+osc osc
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+types_PyMySQL python3-typeshed
+types_PyScreeze python3-typeshed
+types_PyYAML python3-typeshed
+types_Pygments python3-typeshed
+types_SQLAlchemy python3-typeshed
+types_Send2Trash python3-typeshed
+types_aiofiles python3-typeshed
+types_annoy python3-typeshed
+types_appdirs python3-typeshed
+types_aws_xray_sdk python3-typeshed
+types_babel python3-typeshed
+types_backports.ssl_match_hostname python3-typeshed
+types_beautifulsoup4 python3-typeshed
+types_bleach python3-typeshed
+types_boto python3-typeshed
+types_braintree python3-typeshed
+types_cachetools python3-typeshed
+types_caldav python3-typeshed
+types_certifi python3-typeshed
+types_cffi python3-typeshed
+types_chardet python3-typeshed
+types_chevron python3-typeshed
+types_click_spinner python3-typeshed
+types_colorama python3-typeshed
+types_commonmark python3-typeshed
+types_console_menu python3-typeshed
+types_contextvars python3-typeshed
+types_croniter python3-typeshed
+types_cryptography python3-typeshed
+types_dateparser python3-typeshed
+types_decorator python3-typeshed
+types_dj_database_url python3-typeshed
+types_docopt python3-typeshed
+types_docutils python3-typeshed
+types_editdistance python3-typeshed
+types_emoji python3-typeshed
+types_entrypoints python3-typeshed
+types_first python3-typeshed
+types_flake8_2020 python3-typeshed
+types_flake8_bugbear python3-typeshed
+types_flake8_builtins python3-typeshed
+types_flake8_docstrings python3-typeshed
+types_flake8_plugin_utils python3-typeshed
+types_flake8_rst_docstrings python3-typeshed
+types_flake8_simplify python3-typeshed
+types_flake8_typing_imports python3-typeshed
+types_fpdf2 python3-typeshed
+types_gdb python3-typeshed
+types_google_cloud_ndb python3-typeshed
+types_hdbcli python3-typeshed
+types_html5lib python3-typeshed
+types_httplib2 python3-typeshed
+types_humanfriendly python3-typeshed
+types_invoke python3-typeshed
+types_jmespath python3-typeshed
+types_jsonschema python3-typeshed
+types_keyboard python3-typeshed
+types_ldap3 python3-typeshed
+types_mock python3-typeshed
+types_mypy_extensions python3-typeshed
+types_mysqlclient python3-typeshed
+types_oauthlib python3-typeshed
+types_openpyxl python3-typeshed
+types_opentracing python3-typeshed
+types_paho_mqtt python3-typeshed
+types_paramiko python3-typeshed
+types_parsimonious python3-typeshed
+types_passlib python3-typeshed
+types_passpy python3-typeshed
+types_peewee python3-typeshed
+types_pep8_naming python3-typeshed
+types_playsound python3-typeshed
+types_polib python3-typeshed
+types_prettytable python3-typeshed
+types_protobuf python3-typeshed
+types_psutil python3-typeshed
+types_psycopg2 python3-typeshed
+types_pyOpenSSL python3-typeshed
+types_pyRFC3339 python3-typeshed
+types_pyaudio python3-typeshed
+types_pycurl python3-typeshed
+types_pyfarmhash python3-typeshed
+types_pyflakes python3-typeshed
+types_pyinstaller python3-typeshed
+types_pynput python3-typeshed
+types_pysftp python3-typeshed
+types_pytest_lazy_fixture python3-typeshed
+types_python_crontab python3-typeshed
+types_python_dateutil python3-typeshed
+types_python_gflags python3-typeshed
+types_python_jose python3-typeshed
+types_python_nmap python3-typeshed
+types_python_slugify python3-typeshed
+types_pytz python3-typeshed
+types_pyvmomi python3-typeshed
+types_pywin32 python3-typeshed
+types_redis python3-typeshed
+types_regex python3-typeshed
+types_requests python3-typeshed
+types_retry python3-typeshed
+types_setuptools python3-typeshed
+types_simplejson python3-typeshed
+types_singledispatch python3-typeshed
+types_six python3-typeshed
+types_slumber python3-typeshed
+types_stdlib_list python3-typeshed
+types_stripe python3-typeshed
+types_tabulate python3-typeshed
+types_termcolor python3-typeshed
+types_toml python3-typeshed
+types_toposort python3-typeshed
+types_tqdm python3-typeshed
+types_tree_sitter python3-typeshed
+types_tree_sitter_languages python3-typeshed
+types_ttkthemes python3-typeshed
+types_typed_ast python3-typeshed
+types_tzlocal python3-typeshed
+types_ujson python3-typeshed
+types_urllib3 python3-typeshed
+types_vobject python3-typeshed
+types_waitress python3-typeshed
+types_whatthepatch python3-typeshed
+types_xmltodict python3-typeshed
+types_xxhash python3-typeshed
+types_zxcvbn python3-typeshed
+typing_extensions python3-typing-extensions
+typing_inspect python3-typing-inspect
+typogrify python3-typogrify
+tz_converter tz-converter
+tzlocal python3-tzlocal
+uTidylib python3-utidylib
+u_msgpack_python python3-u-msgpack
+ua_parser python3-ua-parser
+uamqp python3-uamqp
+ubuntu_dev_tools python3-ubuntutools
+uc_micro_py python3-uc-micro
+udatetime python3-udatetime
+udiskie udiskie
+ueberzug ueberzug
+uflash python3-uflash
+ufo2ft python3-ufo2ft
+ufo2otf ufo2otf
+ufoLib2 python3-ufolib2
+ufoProcessor python3-ufoprocessor
+ufo_extractor python3-ufo-extractor
+ufonormalizer python3-ufonormalizer
+ufw ufw
+uhashring python3-uhashring
+ujson python3-ujson
+ulmo python3-ulmo
+umap_learn umap-learn
+umis umis
+unattended_upgrades unattended-upgrades
+uncalled uncalled
+uncertainties python3-uncertainties
+undertime undertime
+unearth python3-unearth
+unicodecsv python3-unicodecsv
+unicodedata2 python3-unicodedata2
+unicorn python3-unicorn
+unicycler unicycler
+unidiff python3-unidiff
+unifrac python3-unifrac
+unittest2 python3-unittest2
+unittest_xml_reporting python3-xmlrunner
+unpaddedbase64 python3-unpaddedbase64
+untangle python3-untangle
+untokenize python3-untokenize
+unyt python3-unyt
+upass upass
+upstream_ontologist python3-upstream-ontologist
+uritemplate python3-uritemplate
+uritools python3-uritools
+url_normalize python3-url-normalize
+urllib3 python3-urllib3
+urlscan urlscan
+urlwatch urlwatch
+urwid python3-urwid
+urwid_readline python3-urwid-readline
+urwid_satext python3-urwid-satext
+urwid_utils python3-urwid-utils
+urwidtrees python3-urwidtrees
+usagestats python3-usagestats
+usbrelay_py python3-usbrelay
+usbsdmux usbsdmux
+user_agents python3-user-agents
+userpath python3-userpath
+utf8_locale python3-utf8-locale
+uvicorn python3-uvicorn
+uvloop python3-uvloop
+validate python3-configobj
+validators python3-validators
+validictory python3-validictory
+vanguards vanguards
+variety variety
+vcrpy python3-vcr
+vcstool vcstool
+vcstools python3-vcstools
+vcversioner python3-vcversioner
+vdf python3-vdf
+vdirsyncer vdirsyncer
+vedo python3-vedo
+vega_datasets python3-vega-datasets
+venusian python3-venusian
+versioneer python3-versioneer
+versiontools python3-versiontools
+veusz python3-veusz
+vfit vfit
+viagee viagee
+vine python3-vine
+vinetto vinetto
+virtaal virtaal
+virtnbdbackup virtnbdbackup
+virtualenv python3-virtualenv
+virtualenv_clone python3-virtualenv-clone
+virtualenvwrapper python3-virtualenvwrapper
+virustotal_api python3-virustotal-api
+visidata visidata
+vispy python3-vispy
+vistrails vistrails
+vit vit
+vitrage python3-vitrage
+vitrage_dashboard python3-vitrage-dashboard
+vitrage_tempest_plugin vitrage-tempest-plugin
+vmdb2 vmdb2
+vobject python3-vobject
+volatildap python3-volatildap
+volatile python3-volatile
+voltron voltron
+voluptuous python3-voluptuous
+voluptuous_serialize python3-voluptuous-serialize
+vorta vorta
+vsts_cd_manager python3-vsts-cd-manager
+vttLib python3-vttlib
+vulndb python3-vulndb
+vulture vulture
+w3lib python3-w3lib
+wadllib python3-wadllib
+wafw00f wafw00f
+waiting python3-waiting
+waitress python3-waitress
+wajig wajig
+wapiti3 wapiti
+warlock python3-warlock
+wasabi python3-wasabi
+watchdog python3-watchdog
+watcher_dashboard python3-watcher-dashboard
+watcher_tempest_plugin watcher-tempest-plugin
+watchgod python3-watchgod
+wcag_contrast_ratio python3-wcag-contrast-ratio
+wchartype python3-wchartype
+wcmatch python3-wcmatch
+wcwidth python3-wcwidth
+wdlparse python3-wdlparse
+weasyprint weasyprint
+web.py python3-webpy
+webargs python3-webargs
+webassets python3-webassets
+webcolors python3-webcolors
+webdavclient3 python3-webdavclient
+webencodings python3-webencodings
+weblogo python3-weblogo
+websocket_client python3-websocket
+websocket_httpd python3-websocketd
+websockets python3-websockets
+websockify python3-websockify
+websploit websploit
+webvtt_py python3-webvtt
+wfuzz wfuzz
+wget python3-wget
+whatmaps whatmaps
+whatthepatch python3-whatthepatch
+wheel python3-wheel
+wheezy.template python3-wheezy.template
+whichcraft python3-whichcraft
+whipper whipper
+whisper python3-whisper
+whitenoise python3-whitenoise
+whois python3-whois
+widgetsnbextension python3-widgetsnbextension
+wifite wifite
+wikitrans python3-wikitrans
+wilderness python3-wilderness
+wimsapi python3-wimsapi
+wither python3-wither
+wlc wlc
+wokkel python3-wokkel
+wordcloud python3-wordcloud
+workalendar python3-workalendar
+wrapt python3-wrapt
+ws4py python3-ws4py
+wsaccel python3-wsaccel
+wsgi_intercept python3-wsgi-intercept
+wsgicors python3-wsgicors
+wsgilog python3-wsgilog
+wsproto python3-wsproto
+wstool python3-wstool
+wtf_peewee python3-wtf-peewee
+wurlitzer python3-wurlitzer
+wxPython python3-wxgtk4.0
+wxmplot python3-wxmplot
+wxutils python3-wxutils
+x2go python3-x2go
+x2gobroker python3-x2gobroker
+x_wr_timezone python3-x-wr-timezone
+xandikos xandikos
+xapers xapers
+xapian_haystack python3-xapian-haystack
+xarray python3-xarray
+xarray_sentinel python3-xarray-sentinel
+xattr python3-xattr
+xcffib python3-xcffib
+xdg python3-xdg
+xdo python3-xdo
+xdot xdot
+xeus_python_shell python3-xeus-python-shell
+xgboost python3-xgboost
+xhtml2pdf python3-xhtml2pdf
+xkcd python3-xkcd
+xkcdpass xkcdpass
+xlrd python3-xlrd
+xlwt python3-xlwt
+xmds2 xmds2
+xmldiff xmldiff
+xmlschema python3-xmlschema
+xmlsec python3-xmlsec
+xmltodict python3-xmltodict
+xmodem python3-xmodem
+xonsh xonsh
+xopen python3-xopen
+xphyle python3-xphyle
+xpore xpore
+xpra xpra
+xraydb python3-xraydb
+xraylarch python3-xraylarch
+xrayutilities python3-xrayutilities
+xrootd python3-xrootd
+xrt python3-xrt
+xsdata python3-xsdata
+xtermcolor python3-xtermcolor
+xvfbwrapper python3-xvfbwrapper
+xxdiff_scripts xxdiff-scripts
+xxhash python3-xxhash
+xyzservices python3-xyzservices
+yamllint yamllint
+yamlordereddictloader python3-yamlordereddictloader
+yanagiba yanagiba
+yanc python3-nose-yanc
+yanosim yanosim
+yapf python3-yapf
+yappi python3-yappi
+yaql python3-yaql
+yara_python python3-yara
+yaramod python3-yaramod
+yarl python3-yarl
+yarsync yarsync
+yaswfp python3-yaswfp
+yattag python3-yattag
+yenc python3-yenc
+yokadi yokadi
+yowsup python3-yowsup
+yoyo_migrations python3-yoyo
+yt python3-yt
+yt_dlp yt-dlp
+yubikey_manager python3-ykman
+zVMCloudConnector python3-zvmcloudconnector
+zake python3-zake
+zaqar python3-zaqar
+zaqar_tempest_plugin zaqar-tempest-plugin
+zaqar_ui python3-zaqar-ui
+zarr python3-zarr
+zc.buildout python3-zc.buildout
+zc.customdoctests python3-zc.customdoctests
+zc.lockfile python3-zc.lockfile
+zeep python3-zeep
+zeroconf python3-zeroconf
+zfec python3-zfec
+zict python3-zict
+zigpy python3-zigpy
+zim zim
+zipp python3-zipp
+zipstream python3-zipstream
+zipstream_ng python3-zipstream-ng
+zkg zkg
+zktop zktop
+zlmdb python3-zlmdb
+zodbpickle python3-zodbpickle
+zope.component python3-zope.component
+zope.configuration python3-zope.configuration
+zope.deprecation python3-zope.deprecation
+zope.event python3-zope.event
+zope.exceptions python3-zope.exceptions
+zope.hookable python3-zope.hookable
+zope.i18nmessageid python3-zope.i18nmessageid
+zope.interface python3-zope.interface
+zope.location python3-zope.location
+zope.proxy python3-zope.proxy
+zope.schema python3-zope.schema
+zope.security python3-zope.security
+zope.testing python3-zope.testing
+zope.testrunner python3-zope.testrunner
+zstandard python3-zstandard
+zstd python3-zstd
+zxcvbn python3-zxcvbn
+zzzeeksphinx python3-zzzeeksphinx
diff --git a/pydist/generate_fallback_list.py b/pydist/generate_fallback_list.py
new file mode 100755
index 0000000..5f9e480
--- /dev/null
+++ b/pydist/generate_fallback_list.py
@@ -0,0 +1,156 @@
+#! /usr/bin/python3
+# Copyright © 2010-2015 Piotr Ożarowski <piotr@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import re
+import sys
+try:
+    from distro_info import DistroInfo  # python3-distro-info package
+except ImportError:
+    DistroInfo = None
+from gzip import decompress
+from os import chdir, mkdir
+from os.path import dirname, exists, isdir, join, split
+from urllib.request import urlopen
+
+if '--ubuntu' in sys.argv and DistroInfo:
+    SOURCES = [
+        'http://archive.ubuntu.com/ubuntu/dists/%s/Contents-amd64.gz' %
+        DistroInfo('ubuntu').devel(),
+    ]
+else:
+    SOURCES = [
+        'http://ftp.debian.org/debian/dists/unstable/main/Contents-all.gz',
+        'http://ftp.debian.org/debian/dists/unstable/main/Contents-amd64.gz',
+    ]
+
+IGNORED_PKGS = {'python-setuptools', 'python3-setuptools', 'pypy-setuptools'}
+OVERRIDES = {
+    'cpython2': {
+        'python': 'python',
+        'setuptools': 'python-pkg-resources',
+        'wsgiref': 'python (>= 2.5) | python-wsgiref',
+        'argparse': 'python (>= 2.7) | python-argparse',
+        # not recognized due to .pth file (egg-info is in PIL/ and not in *-packages/)
+        'pil': 'python-pil',
+        'Pillow': 'python-pil'},
+    'cpython3': {
+        'pil': 'python3-pil',
+        'Pillow': 'python3-pil',
+        'pylint': 'pylint',
+        'setuptools': 'python3-pkg-resources',
+        'argparse': 'python3 (>= 3.2)'},
+    'pypy': {}
+}
+
+public_egg = re.compile(r'''
+    /usr/
+    (
+        (?P<cpython2>
+            (lib/python2\.[0-9]/((site)|(dist))-packages)|
+            (share/python-support/[^/]+)
+        )|
+        (?P<cpython3>
+            (lib/python3/dist-packages)
+        )|
+        (?P<pypy>
+            (lib/pypy/dist-packages)
+        )
+    )
+    /[^/]*\.(dist|egg)-info
+''', re.VERBOSE).match
+
+skip_sensible_names = True if '--skip-sensible-names' in sys.argv else False
+
+chdir(dirname(__file__))
+if isdir('../dhpython'):
+    sys.path.append('..')
+else:
+    sys.path.append('/usr/share/dh-python/dhpython/')
+from dhpython.pydist import sensible_pname
+
+data = ''
+if not isdir('cache'):
+    mkdir('cache')
+for source in SOURCES:
+    cache_fpath = join('cache', split(source)[-1])
+    if not exists(cache_fpath):
+        with urlopen(source) as fp:
+            source_data = fp.read()
+        with open(cache_fpath, 'wb') as fp:
+            fp.write(source_data)
+    else:
+        with open(cache_fpath, 'rb') as fp:
+            source_data = fp.read()
+    try:
+        data += str(decompress(source_data), encoding='UTF-8')
+    except UnicodeDecodeError as e:  # Ubuntu
+        data += str(decompress(source_data), encoding='ISO-8859-15')
+
+result = {
+    'cpython3': {}
+}
+
+# Contents file doesn't contain comment these days
+is_header = not data.startswith('bin')
+for line in data.splitlines():
+    if is_header:
+        if line.startswith('FILE'):
+            is_header = False
+        continue
+    try:
+        path, desc = line.rsplit(maxsplit=1)
+    except ValueError:
+        # NOTE(jamespage) some lines in Ubuntu are not parseable.
+        continue
+    path = '/' + path.rstrip()
+    section, pkg_name = desc.rsplit('/', 1)
+    if pkg_name in IGNORED_PKGS:
+        continue
+    match = public_egg(path)
+    if match:
+        egg_name = [i.split('-', 1)[0] for i in path.split('/')
+                    if i.endswith(('.egg-info', '.dist-info'))][0]
+        if egg_name.endswith('.egg'):
+            egg_name = egg_name[:-4]
+
+        impl = next(key for key, value in match.groupdict().items() if value)
+
+        if skip_sensible_names and\
+                sensible_pname(impl, egg_name) == pkg_name:
+            continue
+
+        if impl not in result:
+            continue
+
+        processed = result[impl]
+        if egg_name not in processed:
+            processed[egg_name] = pkg_name
+
+for impl, details in result.items():
+    with open('{}_fallback'.format(impl), 'w') as fp:
+        overrides = OVERRIDES[impl]
+        lines = []
+        for egg, value in overrides.items():
+            lines.append('{} {}\n'.format(egg, value))
+        lines.extend(
+            '{} {}\n'.format(egg, pkg) for egg, pkg in details.items() if egg not in overrides
+        )
+        fp.writelines(sorted(lines))
diff --git a/tests/Makefile b/tests/Makefile
new file mode 100644
index 0000000..55f0c9e
--- /dev/null
+++ b/tests/Makefile
@@ -0,0 +1,20 @@
+#!/usr/bin/make -f
+
+# enable or disable tests here:
+#TESTS := test301 test302 test303 test304 test305 test306 testpb01 testpb02 testpb03 testpb04 testpb05 testpb06 testpb07 testa01 testa02
+TESTS := test301 test302 test303 test304 test305 test306
+
+all: $(TESTS)
+
+test%:
+	make -C t$* run
+	make -C t$* check
+
+clean-test%:
+	make -C t$* clean
+
+clean: $(TESTS:%=clean-%)
+	rm -f *\.dsc *\.tar\.gz *\.build *\.changes *\.deb *\.buildinfo
+	@find . -prune -name '*.egg-info' -exec rm -rf '{}' ';' || true
+
+.PHONY: clean
diff --git a/tests/common.mk b/tests/common.mk
new file mode 100644
index 0000000..b4d4f02
--- /dev/null
+++ b/tests/common.mk
@@ -0,0 +1,19 @@
+#!/usr/bin/make -f
+
+export DEBPYTHON3_DEFAULT ?= $(shell python3 ../../dhpython/_defaults.py default cpython3)
+export DEBPYTHON3_SUPPORTED ?= $(shell python3 ../../dhpython/_defaults.py supported cpython3)
+export DEB_HOST_MULTIARCH=my_multiarch-triplet
+export DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)
+export DH_INTERNAL_OPTIONS=
+
+all: run check
+
+run: clean
+	@echo ============================================================
+	@echo ==== TEST: `basename $$PWD`
+	dpkg-buildpackage -b -us -uc \
+	  --no-check-builddeps \
+	  --check-command="../test-package-show-info"
+
+clean-common:
+	./debian/rules clean
diff --git a/tests/common.py b/tests/common.py
new file mode 100644
index 0000000..7e974fc
--- /dev/null
+++ b/tests/common.py
@@ -0,0 +1,18 @@
+class FakeOptions:
+    def __init__(self, **kwargs):
+        opts = {
+            'depends': (),
+            'depends_section': (),
+            'guess_deps': False,
+            'no_ext_rename': False,
+            'recommends': (),
+            'recommends_section': (),
+            'requires': (),
+            'suggests': (),
+            'suggests_section': (),
+            'vrange': None,
+            'accept_upstream_versions': False,
+        }
+        opts.update(kwargs)
+        for k, v in opts.items():
+            setattr(self, k, v)
diff --git a/tests/t301/Makefile b/tests/t301/Makefile
new file mode 100644
index 0000000..4be460f
--- /dev/null
+++ b/tests/t301/Makefile
@@ -0,0 +1,15 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+check:
+	grep -qe "Depends: .*python3\(:any\)\? (<< 3.9)" debian/python3-foo/DEBIAN/control
+	grep -q "Recommends: .*python3-mako" debian/python3-foo/DEBIAN/control
+	test -f debian/python3-foo/usr/lib/python3/dist-packages/foo/__init__.py
+	test ! -f debian/python3-foo/usr/lib/python3/dist-packages/foo/spam.py
+	grep -q 'py3compile -p python3-foo -V 3\.1-3\.9' debian/python3-foo/DEBIAN/postinst
+	grep -q 'pypy3compile -p python3-foo -V 3\.1-3\.9' debian/python3-foo/DEBIAN/postinst
+	grep -q 'py3clean -p python3-foo\s*$$' debian/python3-foo/DEBIAN/prerm
+
+clean:
+	./debian/rules clean
+	rm -rf lib/Foo.egg-info
diff --git a/tests/t301/debian/changelog b/tests/t301/debian/changelog
new file mode 100644
index 0000000..0f9a168
--- /dev/null
+++ b/tests/t301/debian/changelog
@@ -0,0 +1,5 @@
+foo (0.1.1) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ożarowski <piotr@debian.org>  Sat, 27 Feb 2010 20:42:17 +0100
diff --git a/tests/t301/debian/compat b/tests/t301/debian/compat
new file mode 100644
index 0000000..ec63514
--- /dev/null
+++ b/tests/t301/debian/compat
@@ -0,0 +1 @@
+9
diff --git a/tests/t301/debian/control b/tests/t301/debian/control
new file mode 100644
index 0000000..fc18d76
--- /dev/null
+++ b/tests/t301/debian/control
@@ -0,0 +1,18 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper (>= 7.0.50~), python3-all
+Standards-Version: 3.9.0
+X-Python3-Version: >= 3.1, << 3.9
+
+Architecture: all
+Package: python3-foo
+Depends: ${python3:Depends}, ${misc:Depends}
+Recommends: ${python3:Recommends}
+Suggests: ${python3:Suggests}
+Enhances: ${python3:Enhances}
+Breaks: ${python3:Breaks}
+Provides: ${python3:Provides}
+Description: foo to rule them all
+ example package #1
diff --git a/tests/t301/debian/copyright b/tests/t301/debian/copyright
new file mode 100644
index 0000000..6382944
--- /dev/null
+++ b/tests/t301/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2010, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/t301/debian/py3dist-overrides b/tests/t301/debian/py3dist-overrides
new file mode 100644
index 0000000..ab3ccb8
--- /dev/null
+++ b/tests/t301/debian/py3dist-overrides
@@ -0,0 +1,5 @@
+Mako python3-mako (>= 0.2)
+SQLAlchemy python3-sqlalchemy (>= 0.6)
+Foo python3-foo
+Bar python3-bar
+Baz
\ No newline at end of file
diff --git a/tests/t301/debian/python3-foo.pydist b/tests/t301/debian/python3-foo.pydist
new file mode 100644
index 0000000..82849da
--- /dev/null
+++ b/tests/t301/debian/python3-foo.pydist
@@ -0,0 +1 @@
+SQLAlchemy 3.2-	python3-sqlalchemy; PEP386 s/^/1:/
diff --git a/tests/t301/debian/rules b/tests/t301/debian/rules
new file mode 100755
index 0000000..9c1bdff
--- /dev/null
+++ b/tests/t301/debian/rules
@@ -0,0 +1,25 @@
+#!/usr/bin/make -f
+%:
+	dh $@ --buildsystem=python_distutils
+
+override_dh_auto_install:
+	python3 setup.py install --root=debian/python3-foo/
+
+override_dh_install:
+	dh_install
+	find debian/ -name jquery.js -exec \
+	ln -fs /usr/share/javascript/jquery/jquery.js '{}' \;
+	DH_VERBOSE=1 ../../dh_python3\
+		--depends 'SQLAlchemy >= 0.6.1'\
+		--recommends Mako\
+		--suggests 'Foo >= 0.1'\
+		--suggests 'bar >= 1.0'
+
+clean:
+	rm -rf build
+	dh clean
+
+override_dh_auto_build:
+
+override_dh_auto_clean:
+	#python3 setup.py clean
diff --git a/tests/t301/debian/source/format b/tests/t301/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/t301/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/t301/lib/foo/__init__.py b/tests/t301/lib/foo/__init__.py
new file mode 100644
index 0000000..9df03f8
--- /dev/null
+++ b/tests/t301/lib/foo/__init__.py
@@ -0,0 +1 @@
+print("you just imported foo from %s" % __file__)
diff --git a/tests/t301/lib/foo/bar/__init__.py b/tests/t301/lib/foo/bar/__init__.py
new file mode 100644
index 0000000..669df66
--- /dev/null
+++ b/tests/t301/lib/foo/bar/__init__.py
@@ -0,0 +1 @@
+print("you just imported foo.bar from %s" % __file__)
diff --git a/tests/t301/lib/foo/baz.py b/tests/t301/lib/foo/baz.py
new file mode 100644
index 0000000..934dcfe
--- /dev/null
+++ b/tests/t301/lib/foo/baz.py
@@ -0,0 +1 @@
+print("you just imported foo.baz from %s" % __file__)
diff --git a/tests/t301/lib/foo/jquery.js b/tests/t301/lib/foo/jquery.js
new file mode 120000
index 0000000..b77fd86
--- /dev/null
+++ b/tests/t301/lib/foo/jquery.js
@@ -0,0 +1 @@
+/usr/share/javascript/jquery/jquery.js
\ No newline at end of file
diff --git a/tests/t301/setup.py b/tests/t301/setup.py
new file mode 100644
index 0000000..bb7f37d
--- /dev/null
+++ b/tests/t301/setup.py
@@ -0,0 +1,17 @@
+#! /usr/bin/python3
+from distutils.core import setup
+
+setup(name='Foo',
+      version='0.2',
+      description="package with public modules only",
+      long_description="TODO",
+      keywords='foo bar baz',
+      author='Piotr Ożarowski',
+      author_email='piotr@debian.org',
+      url='http://www.debian.org/',
+      license='MIT',
+      packages=['foo'],
+      package_dir={'foo': 'lib/foo'},
+      package_data={'foo': ['jquery.js']},
+      zip_safe=False,
+)
diff --git a/tests/t302/Makefile b/tests/t302/Makefile
new file mode 100644
index 0000000..2fc6b11
--- /dev/null
+++ b/tests/t302/Makefile
@@ -0,0 +1,18 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+check:
+	grep -q "py3compile -p python3-foo:$(DEB_HOST_ARCH) /usr/lib/python3-foo"\
+		debian/python3-foo/DEBIAN/postinst
+	grep -q "pypy3compile -p python3-foo:$(DEB_HOST_ARCH) /usr/lib/python3-foo"\
+		debian/python3-foo/DEBIAN/postinst
+	grep -q "py3clean -p python3-foo:$(DEB_HOST_ARCH)" debian/python3-foo/DEBIAN/prerm
+	[ "`find debian/python3-foo/usr/lib/python3/dist-packages/foo -name 'bar.cpython-*.so'`" != "" ]
+	test -e debian/python3-foo/usr/lib/python3-foo/empty-private-dir
+	test ! -e debian/python3-foo/usr/lib/python3/dist-packages/empty-public-dir
+	# test if moved from include/python3.X/ to include/python3.Xm/ (for Python << 3.8)
+	#test -f debian/python3-foo/usr/include/python$(DEBPYTHON3_DEFAULT)m/foo.h
+
+clean:
+	./debian/rules clean
+	rm -rf lib/Foo.egg-info build
diff --git a/tests/t302/debian/changelog b/tests/t302/debian/changelog
new file mode 100644
index 0000000..d91e7a7
--- /dev/null
+++ b/tests/t302/debian/changelog
@@ -0,0 +1,5 @@
+foo (0.1.1) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ożarowski <piotr@debian.org>  Sun, 19 Dec 2010 19:40:33 +0100
diff --git a/tests/t302/debian/compat b/tests/t302/debian/compat
new file mode 100644
index 0000000..ec63514
--- /dev/null
+++ b/tests/t302/debian/compat
@@ -0,0 +1 @@
+9
diff --git a/tests/t302/debian/control b/tests/t302/debian/control
new file mode 100644
index 0000000..01a7656
--- /dev/null
+++ b/tests/t302/debian/control
@@ -0,0 +1,18 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper (>= 7.0.50~), python3-all-dev
+Standards-Version: 3.9.1
+X-Python3-Version: >= 3.2
+
+Package: python3-foo
+Architecture: any
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Recommends: ${python3:Recommends}
+Suggests: ${python3:Suggests}
+Enhances: ${python3:Enhances}
+Breaks: ${python3:Breaks}
+Provides: ${python3:Provides}
+Description: package with public and private Python 3 extension
+ example package #3 - Python extensions
diff --git a/tests/t302/debian/copyright b/tests/t302/debian/copyright
new file mode 100644
index 0000000..6382944
--- /dev/null
+++ b/tests/t302/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2010, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/t302/debian/install b/tests/t302/debian/install
new file mode 100644
index 0000000..61f42c3
--- /dev/null
+++ b/tests/t302/debian/install
@@ -0,0 +1,2 @@
+# private module in architecture dependent dir
+lib/foo.py /usr/lib/python3-foo/
diff --git a/tests/t302/debian/rules b/tests/t302/debian/rules
new file mode 100755
index 0000000..a85d729
--- /dev/null
+++ b/tests/t302/debian/rules
@@ -0,0 +1,30 @@
+#!/usr/bin/make -f
+
+%:
+	dh $@ --buildsystem=python_distutils
+
+override_dh_install:
+	dh_install
+	# install also as private extension
+	dh_install debian/python3-foo/usr/local/lib/python3*/dist-packages/foo/bar*.so \
+		/usr/lib/python3-foo/
+	mkdir -p debian/python3-foo/usr/lib/python3/dist-packages/empty-public-dir
+	mkdir -p debian/python3-foo/usr/lib/python3-foo/empty-private-dir
+	DH_VERBOSE=1 ../../dh_python3
+
+comma:=,
+empty:=
+space:= $(empty) $(empty)
+PYTHONS=$(subst $(comma),$(space),$(DEBPYTHON3_SUPPORTED))
+override_dh_auto_build:
+	for ver in $(PYTHONS); do\
+	  python$$ver setup.py build; done
+
+override_dh_auto_install:
+	for ver in $(PYTHONS); do\
+	  python$$ver setup.py install --root=debian/python3-foo;\
+	done
+	mkdir -p debian/python3-foo/usr/include/python$(DEBPYTHON3_DEFAULT)/
+	touch debian/python3-foo/usr/include/python$(DEBPYTHON3_DEFAULT)/foo.h
+
+override_dh_auto_clean:
diff --git a/tests/t302/debian/source/format b/tests/t302/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/t302/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/t302/lib/__init__.py b/tests/t302/lib/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/t302/lib/__init__.py
diff --git a/tests/t302/lib/bar.c b/tests/t302/lib/bar.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/t302/lib/bar.c
diff --git a/tests/t302/lib/foo.py b/tests/t302/lib/foo.py
new file mode 100644
index 0000000..9dd52e6
--- /dev/null
+++ b/tests/t302/lib/foo.py
@@ -0,0 +1,6 @@
+import foo.bar
+
+
+class Foo(object):
+    def __init__(self):
+        foo.bar
diff --git a/tests/t302/setup.py b/tests/t302/setup.py
new file mode 100755
index 0000000..1208046
--- /dev/null
+++ b/tests/t302/setup.py
@@ -0,0 +1,13 @@
+#! /usr/bin/python3
+from distutils.core import setup, Extension
+
+setup(name='Foo',
+      version='0.1',
+      description="package with Python extension",
+      author='Piotr Ożarowski',
+      author_email='piotr@debian.org',
+      url='http://www.debian.org/',
+      ext_modules=[Extension('foo/bar', ['lib/bar.c'])],
+      #py_modules=['package'],
+      packages=['foo'],
+      package_dir={'foo': 'lib'})
diff --git a/tests/t303/Makefile b/tests/t303/Makefile
new file mode 100644
index 0000000..9f2c71b
--- /dev/null
+++ b/tests/t303/Makefile
@@ -0,0 +1,12 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+check:
+	test -f debian/python3-foo/usr/lib/python3/dist-packages/foo.py
+	test ! -d debian/python3-foo/usr/lib/python3.*/site-packages
+	grep -q 'py3compile -p python3-foo\s*$$' debian/python3-foo/DEBIAN/postinst
+	grep -q 'pypy3compile -p python3-foo\s*||\s*true$$' debian/python3-foo/DEBIAN/postinst
+	grep -q 'py3clean -p python3-foo\s*$$' debian/python3-foo/DEBIAN/prerm
+
+clean:
+	./debian/rules clean
diff --git a/tests/t303/debian/changelog b/tests/t303/debian/changelog
new file mode 100644
index 0000000..1a796a1
--- /dev/null
+++ b/tests/t303/debian/changelog
@@ -0,0 +1,5 @@
+foo (0.1.1) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ożarowski <piotr@debian.org>  Thu, 06 Jan 2011 17:23:23 +0100
diff --git a/tests/t303/debian/compat b/tests/t303/debian/compat
new file mode 100644
index 0000000..ec63514
--- /dev/null
+++ b/tests/t303/debian/compat
@@ -0,0 +1 @@
+9
diff --git a/tests/t303/debian/control b/tests/t303/debian/control
new file mode 100644
index 0000000..beb1372
--- /dev/null
+++ b/tests/t303/debian/control
@@ -0,0 +1,12 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper (>= 7.0.50~), python3-all-dev
+Standards-Version: 3.9.1
+
+Package: python3-foo
+Architecture: all
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with public Python 3 modules
+ example package #4 - fix_locations test
diff --git a/tests/t303/debian/copyright b/tests/t303/debian/copyright
new file mode 100644
index 0000000..69cea75
--- /dev/null
+++ b/tests/t303/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2011, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/t303/debian/rules b/tests/t303/debian/rules
new file mode 100755
index 0000000..8f0c8be
--- /dev/null
+++ b/tests/t303/debian/rules
@@ -0,0 +1,23 @@
+#!/usr/bin/make -f
+
+%:
+	dh $@
+
+override_dh_install:
+	dh_install
+	DH_VERBOSE=1 ../../dh_python3
+
+override_dh_auto_build:
+override_dh_auto_test:
+
+comma:=,
+empty:=
+space:= $(empty) $(empty)
+PYTHONS=$(subst $(comma),$(space),$(DEBPYTHON3_SUPPORTED))
+override_dh_auto_install:
+	set -e; for ver in $(PYTHONS); do\
+	  mkdir -p debian/python3-foo/usr/lib/python$$ver/site-packages/;\
+	  echo "print('foo')" > debian/python3-foo/usr/lib/python$$ver/site-packages/foo.py;\
+	done
+
+override_dh_auto_clean:
diff --git a/tests/t303/debian/source/format b/tests/t303/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/t303/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/t304/Makefile b/tests/t304/Makefile
new file mode 100644
index 0000000..d69cdc9
--- /dev/null
+++ b/tests/t304/Makefile
@@ -0,0 +1,23 @@
+#!/usr/bin/make -f
+
+include ../common.mk
+clean: clean-common
+
+check:
+	# python3.2 hardcoded via `dh_python3 --shebang ...python3.2`
+	grep -q '#! /usr/bin/python3.2 -OO' debian/foo/usr/share/baz32/baz.py
+	# python3.4 hardcoded via shebang
+	grep -q '/usr/share/foo \-V 3.4' debian/foo/DEBIAN/postinst
+	# /env removed from shebang 
+	grep -q '#! /usr/bin/python3' debian/foo/usr/share/bar/bar.py
+	# /local removed from shebang 
+	grep -q '#! /usr/bin/python3' debian/foo/usr/share/foo/baz.py
+	grep -q '#! /usr/bin/python3.4' debian/foo/usr/share/foo/foo.py
+	# make sure /usr/share/doc/ is ignored
+	grep -q -v "py3compile -p foo /usr/share/doc"\
+		debian/foo/DEBIAN/postinst
+	# -X made it into the postinst
+	grep -qF "/usr/share/bar -X 'spam.py'" debian/foo/DEBIAN/postinst
+	# Check argument parsing order
+	grep -q '#! /usr/bin/python3-dbg' debian/overrides/usr/share/overrides1/foo.py
+	grep -q '#! /usr/bin/python3-dbg' debian/overrides/usr/share/overrides2/foo.py
diff --git a/tests/t304/bar.py b/tests/t304/bar.py
new file mode 100755
index 0000000..edecee7
--- /dev/null
+++ b/tests/t304/bar.py
@@ -0,0 +1,2 @@
+#!/usr/bin/env python3
+"env in shebang"
diff --git a/tests/t304/baz.py b/tests/t304/baz.py
new file mode 100755
index 0000000..eff389f
--- /dev/null
+++ b/tests/t304/baz.py
@@ -0,0 +1,2 @@
+#!/usr/local/bin/python3
+"/usr/local in shebang"
diff --git a/tests/t304/debian/changelog b/tests/t304/debian/changelog
new file mode 100644
index 0000000..c1ed13c
--- /dev/null
+++ b/tests/t304/debian/changelog
@@ -0,0 +1,5 @@
+foo (1.0) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ożarowski <piotr@debian.org>  Sun, 10 Jun 2012 14:09:45 +0200
diff --git a/tests/t304/debian/compat b/tests/t304/debian/compat
new file mode 100644
index 0000000..ec63514
--- /dev/null
+++ b/tests/t304/debian/compat
@@ -0,0 +1 @@
+9
diff --git a/tests/t304/debian/control b/tests/t304/debian/control
new file mode 100644
index 0000000..4dd38b0
--- /dev/null
+++ b/tests/t304/debian/control
@@ -0,0 +1,19 @@
+Source: foo
+Section: misc
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper (>= 7.0.50~)
+Build-Depends-Indep: python3
+Standards-Version: 3.9.3
+
+Package: foo
+Architecture: all
+Depends: ${python3:Depends}, ${misc:Depends}
+Description: example 4 - shebangs
+ example package #4 - shebang related tests
+
+Package: overrides
+Architecture: all
+Depends: ${python3:Depends}, ${misc:Depends}
+Description: example 4 - command line parsing
+ example package #4 - command line argument parsing
diff --git a/tests/t304/debian/copyright b/tests/t304/debian/copyright
new file mode 100644
index 0000000..bf78fd0
--- /dev/null
+++ b/tests/t304/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2012, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/t304/debian/examples b/tests/t304/debian/examples
new file mode 100644
index 0000000..fe8826b
--- /dev/null
+++ b/tests/t304/debian/examples
@@ -0,0 +1 @@
+foo.py
diff --git a/tests/t304/debian/install b/tests/t304/debian/install
new file mode 100644
index 0000000..a106b6e
--- /dev/null
+++ b/tests/t304/debian/install
@@ -0,0 +1,7 @@
+foo.py /usr/share/foo/
+baz.py /usr/share/foo/
+spam.py /usr/share/foo/
+bar.py /usr/share/bar/
+spam.py /usr/share/bar/
+baz.py /usr/share/baz32/
+spam.py /usr/share/baz32/
diff --git a/tests/t304/debian/overrides.install b/tests/t304/debian/overrides.install
new file mode 100644
index 0000000..23e1322
--- /dev/null
+++ b/tests/t304/debian/overrides.install
@@ -0,0 +1,2 @@
+foo.py /usr/share/overrides1/
+foo.py /usr/share/overrides2/
diff --git a/tests/t304/debian/rules b/tests/t304/debian/rules
new file mode 100755
index 0000000..5de6e3d
--- /dev/null
+++ b/tests/t304/debian/rules
@@ -0,0 +1,26 @@
+#!/usr/bin/make -f
+%:
+	dh $@ --buildsystem=python_distutils
+
+override_dh_auto_build:
+override_dh_auto_install:
+
+override_dh_install:
+	dh_install
+	DH_VERBOSE=1 ../../dh_python3 -p foo
+	DH_VERBOSE=1 ../../dh_python3 -p foo /usr/share/bar -X spam.py
+	DH_VERBOSE=1 ../../dh_python3 -p foo /usr/share/baz32 --shebang '/usr/bin/python3.2 -OO'
+
+	# Argument priority: -O > regular args > DH_OPTIONS
+	DH_VERBOSE=1 DH_OPTIONS=--shebang=/usr/bin/python3.0 \
+		../../dh_python3 -p overrides \
+		--shebang=/usr/bin/python3-dbg \
+		/usr/share/overrides1
+	DH_VERBOSE=1 ../../dh_python3 -p overrides \
+		--shebang=/usr/bin/python3.0 \
+		-O=--shebang=/usr/bin/python3-dbg \
+		-O=--foo=bar \
+		/usr/share/overrides2
+
+clean:
+	dh_clean
diff --git a/tests/t304/debian/source/format b/tests/t304/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/t304/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/t304/foo.py b/tests/t304/foo.py
new file mode 100755
index 0000000..fef29a7
--- /dev/null
+++ b/tests/t304/foo.py
@@ -0,0 +1,2 @@
+#!/usr/local/bin/python3.4
+"/usr/local/bin/python3.4 hardcoded in shebang"
diff --git a/tests/t304/setup.py b/tests/t304/setup.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/t304/setup.py
diff --git a/tests/t304/spam.py b/tests/t304/spam.py
new file mode 100644
index 0000000..c8b0fd9
--- /dev/null
+++ b/tests/t304/spam.py
@@ -0,0 +1 @@
+print('spam')
diff --git a/tests/t305/Makefile b/tests/t305/Makefile
new file mode 100644
index 0000000..1ee30fc
--- /dev/null
+++ b/tests/t305/Makefile
@@ -0,0 +1,14 @@
+#!/usr/bin/make -f
+
+include ../common.mk
+clean: clean-common
+
+check:
+	grep -qe "Depends: .*python3\(:any\)\?" debian/foo5a/DEBIAN/control
+	grep -qe "Depends: .*python3\(:any\)\?" debian/foo5b/DEBIAN/control
+	grep -qe "Depends: .*python3\(:any\)\?" debian/foo5c/DEBIAN/control
+	grep -qe "Depends: .*python3\(:any\)\?" debian/foo5d/DEBIAN/control
+	grep -qe "Depends: .*python3\(:any\)\?" debian/foo5e/DEBIAN/control
+	grep -qe "Depends: .*python3\(:any\)\?" debian/foo5f/DEBIAN/control
+	grep -Fxq dh_python3 debian/foo5a.debhelper.log.end_dh_install
+	grep -Fxc dh_python3 debian/foo5a.debhelper.log.end_dh_install | grep -Fxq 1
diff --git a/tests/t305/debian/changelog b/tests/t305/debian/changelog
new file mode 100644
index 0000000..d30d06c
--- /dev/null
+++ b/tests/t305/debian/changelog
@@ -0,0 +1,5 @@
+foo (1.0) unstable; urgency=low
+
+  * Initial release
+
+ -- Maximilian Engelhardt <maxi@daemonizer.de>  Fri, 02 Apr 2021 14:30:25 +0200
diff --git a/tests/t305/debian/compat b/tests/t305/debian/compat
new file mode 100644
index 0000000..48082f7
--- /dev/null
+++ b/tests/t305/debian/compat
@@ -0,0 +1 @@
+12
diff --git a/tests/t305/debian/control b/tests/t305/debian/control
new file mode 100644
index 0000000..8eafc3e
--- /dev/null
+++ b/tests/t305/debian/control
@@ -0,0 +1,43 @@
+Source: foo
+Section: misc
+Priority: optional
+Maintainer: Maximilian Engelhardt <maxi@daemonizer.de>
+Build-Depends: debhelper (>= 12.9)
+Build-Depends-Indep: python3
+Standards-Version: 4.5.1
+
+Package: foo5a
+Architecture: all
+Depends: ${python3:Depends}, ${misc:Depends}
+Description: example 5a - private shebangs
+ example package #5 - shebang related tests in private dirs
+
+Package: foo5b
+Architecture: all
+Depends: ${python3:Depends}, ${misc:Depends}
+Description: example 5b - private shebangs
+ example package #5 - shebang related tests in private dirs
+
+Package: foo5c
+Architecture: all
+Depends: ${python3:Depends}, ${misc:Depends}
+Description: example 5c - private shebangs
+ example package #5 - shebang related tests in private dirs
+
+Package: foo5d
+Architecture: all
+Depends: ${python3:Depends}, ${misc:Depends}
+Description: example 5d - private shebangs
+ example package #5 - shebang related tests in private dirs
+
+Package: foo5e
+Architecture: all
+Depends: ${python3:Depends}, ${misc:Depends}
+Description: example 5e - private shebangs
+ example package #5 - shebang related tests in private dirs
+
+Package: foo5f
+Architecture: all
+Depends: ${python3:Depends}, ${misc:Depends}
+Description: example 5f - private shebangs
+ example package #5 - shebang related tests in private dirs
diff --git a/tests/t305/debian/copyright b/tests/t305/debian/copyright
new file mode 100644
index 0000000..32bbc0d
--- /dev/null
+++ b/tests/t305/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2021, Maximilian Engelhardt <maxi@daemonizer.de> and
+is licensed under the MIT License.
diff --git a/tests/t305/debian/foo5a.install b/tests/t305/debian/foo5a.install
new file mode 100644
index 0000000..38009bc
--- /dev/null
+++ b/tests/t305/debian/foo5a.install
@@ -0,0 +1 @@
+foo5a /usr/share/foo/
diff --git a/tests/t305/debian/foo5b.install b/tests/t305/debian/foo5b.install
new file mode 100644
index 0000000..0fd0869
--- /dev/null
+++ b/tests/t305/debian/foo5b.install
@@ -0,0 +1 @@
+foo5b /usr/share/foo/
diff --git a/tests/t305/debian/foo5c.install b/tests/t305/debian/foo5c.install
new file mode 100644
index 0000000..a40b010
--- /dev/null
+++ b/tests/t305/debian/foo5c.install
@@ -0,0 +1 @@
+foo5c /usr/share/foo/
diff --git a/tests/t305/debian/foo5d.install b/tests/t305/debian/foo5d.install
new file mode 100644
index 0000000..e6e2aea
--- /dev/null
+++ b/tests/t305/debian/foo5d.install
@@ -0,0 +1 @@
+foo5d /usr/share/foo/
diff --git a/tests/t305/debian/rules b/tests/t305/debian/rules
new file mode 100755
index 0000000..c43eaae
--- /dev/null
+++ b/tests/t305/debian/rules
@@ -0,0 +1,22 @@
+#!/usr/bin/make -f
+%:
+	dh $@ --buildsystem=none
+
+override_dh_auto_install:
+	dh_auto_install
+	mkdir -p debian/foo5e/usr/share/foo/
+	echo "#! /usr/bin/env $(shell py3versions -d)\n\"/usr/bin/env DEFAULT_PYTHON shebang\"" > debian/foo5e/usr/share/foo/foo5e
+	chmod +x debian/foo5e/usr/share/foo/foo5e
+	mkdir -p debian/foo5f/usr/share/foo/
+	echo "#! /usr/bin/$(shell py3versions -d)\n\"/usr/bin/DEFAULT_PYTHON shebang\"" > debian/foo5f/usr/share/foo/foo5f
+	chmod +x debian/foo5f/usr/share/foo/foo5f
+
+override_dh_install:
+	dh_install
+	DH_VERBOSE=1 ../../dh_python3 -p foo5a /usr/share/foo
+	DH_VERBOSE=1 ../../dh_python3 --remaining-packages /usr/share/foo
+	cp debian/foo5a.debhelper.log debian/foo5a.debhelper.log.end_dh_install
+
+clean:
+	rm -f debian/foo5a.debhelper.log.end_dh_install
+	dh_clean
diff --git a/tests/t305/debian/source/format b/tests/t305/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/t305/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/t305/foo5a b/tests/t305/foo5a
new file mode 100755
index 0000000..3045ad0
--- /dev/null
+++ b/tests/t305/foo5a
@@ -0,0 +1,2 @@
+#! /usr/bin/python3
+"/usr/bin/python3 shebang"
diff --git a/tests/t305/foo5b b/tests/t305/foo5b
new file mode 100755
index 0000000..49352f5
--- /dev/null
+++ b/tests/t305/foo5b
@@ -0,0 +1,2 @@
+#! /usr/bin/python
+"/usr/bin/python shebang"
diff --git a/tests/t305/foo5c b/tests/t305/foo5c
new file mode 100755
index 0000000..2ee0891
--- /dev/null
+++ b/tests/t305/foo5c
@@ -0,0 +1,2 @@
+#! /usr/bin/env python3
+"/usr/bin/env python3 shebang"
diff --git a/tests/t305/foo5d b/tests/t305/foo5d
new file mode 100755
index 0000000..b698372
--- /dev/null
+++ b/tests/t305/foo5d
@@ -0,0 +1,2 @@
+#! /usr/bin/env python
+"/usr/bin/env python shebang"
diff --git a/tests/t306/Makefile b/tests/t306/Makefile
new file mode 100644
index 0000000..9dbf8c4
--- /dev/null
+++ b/tests/t306/Makefile
@@ -0,0 +1,17 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+all: run check
+
+run: clean
+	dpkg-buildpackage -b -us -uc
+
+check:
+	grep -qe "^Depends: .*python3\(:any\)\? (<< 3\.[0-9]\+)" \
+		debian/foo/DEBIAN/control
+	grep -qe "^Depends: .*python3\(:any\)\? (>= 3\.[0-9]\+~)" \
+		debian/foo/DEBIAN/control
+
+clean:
+	./debian/rules clean
+	rm -rf lib/Foo.egg-info build
diff --git a/tests/t306/debian/changelog b/tests/t306/debian/changelog
new file mode 100644
index 0000000..874dc1d
--- /dev/null
+++ b/tests/t306/debian/changelog
@@ -0,0 +1,5 @@
+foo (0.1) unstable; urgency=low
+
+  * Initial release
+
+ -- Maximilian Engelhardt <maxi@daemonizer.de>  Sun, 04 Apr 2021 13:09:48 +0200
diff --git a/tests/t306/debian/compat b/tests/t306/debian/compat
new file mode 100644
index 0000000..48082f7
--- /dev/null
+++ b/tests/t306/debian/compat
@@ -0,0 +1 @@
+12
diff --git a/tests/t306/debian/control b/tests/t306/debian/control
new file mode 100644
index 0000000..79446f3
--- /dev/null
+++ b/tests/t306/debian/control
@@ -0,0 +1,13 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Maximilian Engelhardt <maxi@daemonizer.de>
+Build-Depends: debhelper (>= 12.9), python3-all-dev:any
+Standards-Version: 4.5.1
+
+Package: foo
+Architecture: any
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with python3-all-dev dependency using :any
+ example package #6 - private Python extensions and python3-all-dev:any
+ dependency
diff --git a/tests/t306/debian/copyright b/tests/t306/debian/copyright
new file mode 100644
index 0000000..32bbc0d
--- /dev/null
+++ b/tests/t306/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2021, Maximilian Engelhardt <maxi@daemonizer.de> and
+is licensed under the MIT License.
diff --git a/tests/t306/debian/rules b/tests/t306/debian/rules
new file mode 100755
index 0000000..d1ffc6a
--- /dev/null
+++ b/tests/t306/debian/rules
@@ -0,0 +1,14 @@
+#!/usr/bin/make -f
+
+%:
+	dh $@ --buildsystem=none
+
+override_dh_install:
+	dh_install
+	DH_VERBOSE=1 ../../dh_python3
+
+override_dh_auto_build:
+	python3 setup.py build
+
+override_dh_auto_install:
+	python3 setup.py install --root=debian/foo/ --install-lib=/usr/share/foo/python
diff --git a/tests/t306/debian/source/format b/tests/t306/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/t306/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/t306/lib/__init__.py b/tests/t306/lib/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/t306/lib/__init__.py
diff --git a/tests/t306/lib/bar.c b/tests/t306/lib/bar.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/t306/lib/bar.c
diff --git a/tests/t306/lib/foo.py b/tests/t306/lib/foo.py
new file mode 100644
index 0000000..9dd52e6
--- /dev/null
+++ b/tests/t306/lib/foo.py
@@ -0,0 +1,6 @@
+import foo.bar
+
+
+class Foo(object):
+    def __init__(self):
+        foo.bar
diff --git a/tests/t306/setup.py b/tests/t306/setup.py
new file mode 100755
index 0000000..25727f2
--- /dev/null
+++ b/tests/t306/setup.py
@@ -0,0 +1,12 @@
+#! /usr/bin/python3
+from distutils.core import setup, Extension
+
+setup(name='Foo',
+      version='0.1',
+      description="package with private Python extension",
+      author='Maximilian Engelhardt',
+      author_email='maxi@daemonizer.de',
+      url='http://www.debian.org/',
+      ext_modules=[Extension('foo/bar', ['lib/bar.c'])],
+      packages=['foo'],
+      package_dir={'foo': 'lib'})
diff --git a/tests/ta01/Makefile b/tests/ta01/Makefile
new file mode 100644
index 0000000..65c9796
--- /dev/null
+++ b/tests/ta01/Makefile
@@ -0,0 +1,39 @@
+all: run check
+
+run:
+	@echo No build needed
+ifeq ($(AUTOPKGTEST_TMP),)
+	@echo NOTE this test uses the system pybuild-autopkgtest, not the working directory
+endif
+
+check: pass fail
+
+pass:
+	@echo "=============================================================="
+	@echo "= pybuild-autopkgtest passes when tests pass                 ="
+	@echo "=============================================================="
+	@echo
+	pybuild-autopkgtest
+	test -f marker-before-pybuild-autopkgtest
+	test -f marker-after-pybuild-autopkgtest
+	grep '^1$$' marker-PYBUILD_AUTOPKGTEST
+	@echo '------------------------------'
+	@echo "OK: pybuild-autopkgtest passed"
+	@echo '------------------------------'
+	@echo
+
+fail:
+	@echo "=============================================================="
+	@echo "= pybuild-autopkgtest fails when tests fail                  ="
+	@echo "=============================================================="
+	@echo
+	! FAILS=1 pybuild-autopkgtest
+	@echo '------------------------------'
+	@echo "OK: pybuild-autopkgtest failed"
+	@echo '------------------------------'
+	@echo
+
+clean:
+ifneq ($(AUTOPKGTEST_TMP),)
+	rm -r $(AUTOPKGTEST_TMP)/*
+endif
diff --git a/tests/ta01/debian/changelog b/tests/ta01/debian/changelog
new file mode 100644
index 0000000..322011c
--- /dev/null
+++ b/tests/ta01/debian/changelog
@@ -0,0 +1,5 @@
+foo (1.2.3) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ozarowski <piotr@debian.org>  Tue, 02 Jul 2013 11:02:06 +0200
diff --git a/tests/ta01/debian/control b/tests/ta01/debian/control
new file mode 100644
index 0000000..f8922fc
--- /dev/null
+++ b/tests/ta01/debian/control
@@ -0,0 +1,15 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper-compat (= 12)
+ , pybuild-plugin-pyproject
+ , python3-all
+ , python3-setuptools
+Standards-Version: 3.9.4
+
+Package: python3-foo
+Architecture: any
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with public CPython modules
+ example package #8
diff --git a/tests/ta01/debian/rules b/tests/ta01/debian/rules
new file mode 100755
index 0000000..e53f0aa
--- /dev/null
+++ b/tests/ta01/debian/rules
@@ -0,0 +1,33 @@
+#!/usr/bin/make -f
+
+export PYBUILD_NAME=foo
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	../../pybuild --build --verbose
+
+override_dh_auto_install:
+	../../pybuild --install
+
+override_dh_auto_test:
+	../../pybuild --test
+
+override_dh_auto_clean:
+	../../pybuild --clean --verbose
+	rm -rf .pybuild foo.egg-info
+
+override_dh_installinit:
+	DH_VERBOSE=1 ../../dh_python3
+	dh_installinit
+
+override_dh_python3:
+	# ignore any system dh_python3
+
+before-pybuild-autopkgtest:
+	echo $(PYBUILD_AUTOPKGTEST) > marker-PYBUILD_AUTOPKGTEST
+	touch marker-before-pybuild-autopkgtest
+
+after-pybuild-autopkgtest:
+	touch marker-after-pybuild-autopkgtest
diff --git a/tests/ta01/foo/__init__.py b/tests/ta01/foo/__init__.py
new file mode 100644
index 0000000..92d9a9a
--- /dev/null
+++ b/tests/ta01/foo/__init__.py
@@ -0,0 +1 @@
+"Nothing here"
diff --git a/tests/ta01/pyproject.toml b/tests/ta01/pyproject.toml
new file mode 100644
index 0000000..9787c3b
--- /dev/null
+++ b/tests/ta01/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
diff --git a/tests/ta01/setup.cfg b/tests/ta01/setup.cfg
new file mode 100644
index 0000000..877dcf7
--- /dev/null
+++ b/tests/ta01/setup.cfg
@@ -0,0 +1,10 @@
+[metadata]
+name = foo
+version = 0.1
+description = My package description
+long_description = My long description
+license = Expat
+
+[options]
+zip_safe = False
+packages = find:
diff --git a/tests/ta01/tests/__init__.py b/tests/ta01/tests/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/ta01/tests/__init__.py
diff --git a/tests/ta01/tests/test_foo.py b/tests/ta01/tests/test_foo.py
new file mode 100644
index 0000000..263a9fb
--- /dev/null
+++ b/tests/ta01/tests/test_foo.py
@@ -0,0 +1,7 @@
+import os
+import unittest
+
+class TestPybuildAutopkgtest(unittest.TestCase):
+
+    def test_pass_or_fails(self):
+        self.assertIsNone(os.environ.get("FAILS"))
diff --git a/tests/ta02/Makefile b/tests/ta02/Makefile
new file mode 100644
index 0000000..f6c26ed
--- /dev/null
+++ b/tests/ta02/Makefile
@@ -0,0 +1,17 @@
+all: run check
+
+run:
+	@echo No build needed
+ifeq ($(AUTOPKGTEST_TMP),)
+	@echo NOTE this test uses the system pybuild-autopkgtest, not the working directory
+endif
+
+check:
+	DH_VERBOSE=1 pybuild-autopkgtest
+	test -e custom-test-executed
+
+clean:
+	./debian/rules clean
+ifneq ($(AUTOPKGTEST_TMP),)
+	rm -r $(AUTOPKGTEST_TMP)/*
+endif
diff --git a/tests/ta02/debian/changelog b/tests/ta02/debian/changelog
new file mode 100644
index 0000000..322011c
--- /dev/null
+++ b/tests/ta02/debian/changelog
@@ -0,0 +1,5 @@
+foo (1.2.3) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ozarowski <piotr@debian.org>  Tue, 02 Jul 2013 11:02:06 +0200
diff --git a/tests/ta02/debian/control b/tests/ta02/debian/control
new file mode 100644
index 0000000..648c259
--- /dev/null
+++ b/tests/ta02/debian/control
@@ -0,0 +1,16 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper-compat (= 12)
+ , pybuild-plugin-pyproject
+ , python3-all
+ , python3-pytest
+ , python3-setuptools
+Standards-Version: 3.9.4
+
+Package: python3-foo
+Architecture: any
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with public CPython modules
+ example package #8
diff --git a/tests/ta02/debian/rules b/tests/ta02/debian/rules
new file mode 100755
index 0000000..b612080
--- /dev/null
+++ b/tests/ta02/debian/rules
@@ -0,0 +1,28 @@
+#!/usr/bin/make -f
+
+export PYBUILD_NAME=foo
+export PYBUILD_TEST_CUSTOM=1
+export PYBUILD_TEST_ARGS=touch {dir}/custom-test-executed
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	../../pybuild --build --verbose
+
+override_dh_auto_install:
+	../../pybuild --install
+
+override_dh_auto_test:
+	../../pybuild --test
+
+override_dh_auto_clean:
+	../../pybuild --clean --verbose
+	rm -rf custom-test-executed foo.egg-info
+
+override_dh_installinit:
+	DH_VERBOSE=1 ../../dh_python3
+	dh_installinit
+
+override_dh_python3:
+	# ignore any system dh_python3
diff --git a/tests/ta02/foo/__init__.py b/tests/ta02/foo/__init__.py
new file mode 100644
index 0000000..92d9a9a
--- /dev/null
+++ b/tests/ta02/foo/__init__.py
@@ -0,0 +1 @@
+"Nothing here"
diff --git a/tests/ta02/pyproject.toml b/tests/ta02/pyproject.toml
new file mode 100644
index 0000000..9787c3b
--- /dev/null
+++ b/tests/ta02/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
diff --git a/tests/ta02/setup.cfg b/tests/ta02/setup.cfg
new file mode 100644
index 0000000..877dcf7
--- /dev/null
+++ b/tests/ta02/setup.cfg
@@ -0,0 +1,10 @@
+[metadata]
+name = foo
+version = 0.1
+description = My package description
+long_description = My long description
+license = Expat
+
+[options]
+zip_safe = False
+packages = find:
diff --git a/tests/ta02/tests/__init__.py b/tests/ta02/tests/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/ta02/tests/__init__.py
diff --git a/tests/ta02/tests/test_foo.py b/tests/ta02/tests/test_foo.py
new file mode 100644
index 0000000..2cac2b2
--- /dev/null
+++ b/tests/ta02/tests/test_foo.py
@@ -0,0 +1,7 @@
+import unittest
+
+class TestThatWeDontRunTheseTests(unittest.TestCase):
+
+    def test_fail(self):
+        # We want the custom test runner to run, not this test suite
+        self.assertTrue(False)
diff --git a/tests/test-package-show-info b/tests/test-package-show-info
new file mode 100755
index 0000000..bdea2b4
--- /dev/null
+++ b/tests/test-package-show-info
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -ue
+
+changes=$1
+testname=$(basename $PWD)
+basedir=$(dirname $changes)
+
+echo "--------------------------------------------------"
+echo "Test $testname has created the following packages:"
+for deb in $(sed -nr 's/.* ([^ ]*\.deb)$/\1/p' $changes | sort -u); do
+    echo "--------------------------------------------------"
+    echo "PACKAGE $deb:"
+    dpkg-deb --info "$basedir/$deb"
+done
+echo "--------------------------------------------------"
diff --git a/tests/test_debhelper.py b/tests/test_debhelper.py
new file mode 100644
index 0000000..285440c
--- /dev/null
+++ b/tests/test_debhelper.py
@@ -0,0 +1,192 @@
+from tempfile import TemporaryDirectory
+import unittest
+import os
+
+from dhpython.debhelper import DebHelper, build_options
+
+
+class DebHelperTestCase(unittest.TestCase):
+    impl = 'cpython3'
+    control = []
+    options = {}
+    parse_control = True
+
+    def build_options(self):
+        return build_options(**self.options)
+
+    def setUp(self):
+        self.tempdir = TemporaryDirectory()
+        self.addCleanup(self.tempdir.cleanup)
+
+        old_wd = os.getcwd()
+        os.chdir(self.tempdir.name)
+        self.addCleanup(os.chdir, old_wd)
+
+        os.mkdir('debian')
+        with open('debian/control', 'w') as f:
+            f.write('\n'.join(self.control))
+        if self.parse_control:
+            self.dh = DebHelper(self.build_options(), impl=self.impl)
+
+
+CONTROL = [
+    'Source: foo-src',
+    'Build-Depends: python3-all,',
+    ' python-all,',
+    ' bar (<< 2) [amd64],',
+    ' baz (>= 1.0)',
+    'X-Python3-Version: >= 3.1, << 3.10',
+    '',
+    'Architecture: all',
+    'Package: python3-foo',
+    'Depends: ${python3:Depends}',
+    '',
+    'Package: python3-foo-ext',
+    'Architecture: any',
+    'Depends: ${python3:Depends}, '
+    '# COMMENT',
+    ' ${shlibs:Depends},',
+    '',
+    'Package: python-foo',
+    'Architecture: all',
+    'Depends: ${python:Depends}',
+    '',
+    '',
+    'Package: foo',
+    'Architecture: all',
+    'Depends: ${python3:Depends}',
+    '',
+    '',
+    'Package: recfoo',
+    'Architecture: all',
+    'Recommends: ${python3:Depends}',
+    '',
+    '',
+]
+
+class TestControlBlockParsing(DebHelperTestCase):
+    control = CONTROL
+
+    def test_parses_source(self):
+        self.assertEqual(self.dh.source_name, 'foo-src')
+
+    def test_parses_build_depends(self):
+        self.assertEqual(self.dh.build_depends, {
+            'python3-all': {None: None},
+            'python-all': {None: None},
+            'bar': {'amd64': '<< 2'},
+            'baz': {None: '>= 1.0'},
+        })
+
+    def test_parses_XPV(self):
+        self.assertEqual(self.dh.python_version, '>= 3.1, << 3.10')
+
+    def test_parses_packages(self):
+        self.assertEqual(list(self.dh.packages.keys()),
+                         ['python3-foo', 'python3-foo-ext', 'foo', 'recfoo'])
+
+    def test_parses_arch(self):
+        self.assertEqual(self.dh.packages['python3-foo-ext']['arch'], 'any')
+
+    def test_parses_arch_all(self):
+        self.assertEqual(self.dh.packages['python3-foo']['arch'], 'all')
+
+
+class TestControlSkipIndep(DebHelperTestCase):
+    control = CONTROL
+    options = {
+        'arch': True,
+    }
+
+    def test_skip_indep(self):
+        self.assertEqual(list(self.dh.packages.keys()), ['python3-foo-ext'])
+
+
+class TestControlSkipArch(DebHelperTestCase):
+    control = CONTROL
+    options = {
+        'arch': False,
+    }
+
+    def test_skip_arch(self):
+        self.assertEqual(list(self.dh.packages.keys()),
+                         ['python3-foo', 'foo', 'recfoo'])
+
+
+class TestControlSinglePkg(DebHelperTestCase):
+    control = CONTROL
+    options = {
+        'package': ['python3-foo'],
+    }
+
+    def test_parses_packages(self):
+        self.assertEqual(list(self.dh.packages.keys()), ['python3-foo'])
+
+
+class TestControlSkipSinglePkg(DebHelperTestCase):
+    control = CONTROL
+    options = {
+        'no_package': ['python3-foo'],
+    }
+
+    def test_parses_packages(self):
+        self.assertEqual(list(self.dh.packages.keys()),
+                         ['python3-foo-ext', 'foo', 'recfoo'])
+
+
+class TestControlBlockParsingPy2(DebHelperTestCase):
+    control = CONTROL
+    impl = 'cpython2'
+
+    def test_parses_packages(self):
+        self.assertEqual(list(self.dh.packages.keys()), ['python-foo'])
+
+
+class TestControlNoBinaryPackages(DebHelperTestCase):
+    control = [
+        'Source: foo-src',
+        'Build-Depends: python3-all',
+        '',
+    ]
+    parse_control = False
+
+    def test_throws_error(self):
+        msg = ('Unable to parse debian/control, found less than 2 paragraphs')
+        with self.assertRaisesRegex(Exception, msg):
+            DebHelper(self.build_options())
+
+
+class TestControlMissingPackage(DebHelperTestCase):
+    control = [
+        'Source: foo-src',
+        'Build-Depends: python3-all',
+        '',
+        'Architecture: all',
+    ]
+    parse_control = False
+
+    def test_parses_packages(self):
+        msg = ('Unable to parse debian/control, paragraph 2 missing Package '
+               'field')
+        with self.assertRaisesRegex(Exception, msg):
+            DebHelper(self.build_options())
+
+
+class TestRemainingPackages(DebHelperTestCase):
+    control = CONTROL
+    options = {
+        'remaining_packages': True,
+    }
+    parse_control = False
+
+    def setUp(self):
+        super().setUp()
+        with open('debian/python3-foo.debhelper.log', 'w') as f:
+            f.write('dh_python3\n')
+        with open('debian/python3-foo-ext.debhelper.log', 'w') as f:
+            f.write('dh_foobar\n')
+        self.dh = DebHelper(self.build_options(), impl=self.impl)
+
+    def test_skips_logged_packages(self):
+        self.assertEqual(list(self.dh.packages.keys()),
+                         ['python3-foo-ext', 'foo', 'recfoo'])
diff --git a/tests/test_depends.py b/tests/test_depends.py
new file mode 100644
index 0000000..d208438
--- /dev/null
+++ b/tests/test_depends.py
@@ -0,0 +1,726 @@
+import os
+import logging
+import platform
+import unittest
+from copy import deepcopy
+from pickle import dumps
+from tempfile import TemporaryDirectory
+
+from dhpython.depends import Dependencies
+from dhpython.version import Version
+
+from tests.common import FakeOptions
+
+
+def pep386(d):
+    """Mark all pydist entries as being PEP386"""
+    for k, v in d.items():
+        if isinstance(v, str):
+            d[k] = {'dependency': v}
+            d[k].setdefault('standard', 'PEP386')
+    return d
+
+
+def py27(d):
+    """Mark all pydist entries as being for Python 2.7"""
+    for k, v in d.items():
+        if isinstance(v, str):
+            d[k] = {'dependency': v}
+            d[k].setdefault('versions', {Version('2.7')})
+    return d
+
+
+def prime_pydist(impl, pydist):
+    """Fake the pydist data for impl. Returns a cleanup function"""
+    from dhpython.pydist import load
+
+    for name, entries in pydist.items():
+        if not isinstance(entries, list):
+            pydist[name] = entries = [entries]
+        for i, entry in enumerate(entries):
+            if isinstance(entry, str):
+                entries[i] = entry = {'dependency': entry}
+            entry.setdefault('name', name)
+            entry.setdefault('standard', '')
+            entry.setdefault('rules', [])
+            entry.setdefault('versions', set())
+
+    key = dumps(((impl,), {}))
+    load.cache[key] = pydist
+    return lambda: load.cache.pop(key)
+
+
+class DependenciesTestCase(unittest.TestCase):
+    pkg = 'foo'
+    impl = 'cpython3'
+    pydist = {}
+    stats = {
+        'compile': False,
+        'dist-info': set(),
+        'egg-info': set(),
+        'ext_no_version': set(),
+        'ext_vers': set(),
+        'nsp.txt': set(),
+        'private_dirs': {},
+        'public_vers': set(),
+        'requires.txt': set(),
+        'shebangs': set(),
+    }
+    requires = {}
+    dist_info_metadata = {}
+    options = FakeOptions()
+    parse = True
+
+    def setUp(self):
+        self.d = Dependencies(self.pkg, self.impl)
+
+        stats = deepcopy(self.stats)
+        write_files = {}
+        if self.requires:
+            for fn, lines in self.requires.items():
+                write_files[fn] = lines
+                stats['requires.txt'].add(fn)
+
+        if self.dist_info_metadata:
+            for fn, lines in self.dist_info_metadata.items():
+                write_files[fn] = lines
+                stats['dist-info'].add(fn)
+
+        if write_files:
+            self.tempdir = TemporaryDirectory()
+            self.addCleanup(self.tempdir.cleanup)
+            old_wd = os.getcwd()
+            os.chdir(self.tempdir.name)
+            self.addCleanup(os.chdir, old_wd)
+
+        for fn, lines in write_files.items():
+            os.makedirs(os.path.dirname(fn))
+            with open(fn, 'w') as f:
+                f.write('\n'.join(lines))
+
+        cleanup = prime_pydist(self.impl, self.pydist)
+        self.addCleanup(cleanup)
+
+        if self.parse:
+            self.d.parse(stats, self.options)
+        else:
+            self.prepared_stats = stats
+
+    def assertNotInDepends(self, pkg):
+        """Assert that pkg doesn't appear *anywhere* in self.d.depends"""
+        for dep in self.d.depends:
+            for alt in dep.split('|'):
+                alt = alt.strip().split('(', 1)[0].strip()
+                if pkg == alt:
+                    raise AssertionError(f'{pkg} appears in {alt}')
+
+
+class TestRequiresCPython3(DependenciesTestCase):
+    options = FakeOptions(guess_deps=True)
+    pydist = {
+        'bar': 'python3-bar',
+        'baz': {'dependency': 'python3-baz', 'standard': 'PEP386'},
+        'quux': {'dependency': 'python3-quux', 'standard': 'PEP386'},
+    }
+    requires = {
+        'debian/foo/usr/lib/python3/dist-packages/foo.egg-info/requires.txt': (
+            'bar',
+            'baz >= 1.0',
+            'quux',
+        ),
+    }
+
+    def test_depends_on_bar(self):
+        self.assertIn('python3-bar', self.d.depends)
+
+    def test_depends_on_baz(self):
+        self.assertIn('python3-baz (>= 1.0)', self.d.depends)
+
+
+class TestRequiresPyPy(DependenciesTestCase):
+    impl = 'pypy'
+    options = FakeOptions(guess_deps=True)
+    pydist = {
+        'bar': 'pypy-bar',
+        'baz': {'dependency': 'pypy-baz', 'standard': 'PEP386'},
+        'quux': {'dependency': 'pypy-quux', 'standard': 'PEP386'},
+    }
+    requires = {
+        'debian/foo/usr/lib/pypy/dist-packages/foo.egg-info/requires.txt': (
+            'bar',
+            'baz >= 1.0',
+            'quux',
+        )
+    }
+
+    def test_depends_on_bar(self):
+        self.assertIn('pypy-bar', self.d.depends)
+
+    def test_depends_on_baz(self):
+        self.assertIn('pypy-baz (>= 1.0)', self.d.depends)
+
+
+class TestRequiresCompatible(DependenciesTestCase):
+    options = FakeOptions(guess_deps=True)
+    pydist = {
+        'bar': 'python3-bar',
+        'baz': {'dependency': 'python3-baz', 'standard': 'PEP386'},
+        'qux': {'dependency': 'python3-qux', 'standard': 'PEP386'},
+        'quux': {'dependency': 'python3-quux', 'standard': 'PEP386'},
+    }
+    requires = {
+        'debian/foo/usr/lib/python3/dist-packages/foo.egg-info/requires.txt': (
+            'bar',
+            'baz ~= 1.1',
+            'qux == 1.*',
+            'quux',
+        ),
+    }
+
+    def test_depends_on_bar(self):
+        self.assertIn('python3-bar', self.d.depends)
+
+    def test_depends_on_baz(self):
+        self.assertIn('python3-baz (>= 1.1), python3-baz (<< 2)', self.d.depends)
+
+    def test_depends_on_qux(self):
+        self.assertIn('python3-qux (>= 1.0), python3-qux (<< 2)', self.d.depends)
+
+
+class TestRequiresDistPython3(DependenciesTestCase):
+    options = FakeOptions(guess_deps=True)
+    pydist = {
+        'bar': 'python3-bar',
+        'baz': {'dependency': 'python3-baz', 'standard': 'PEP386'},
+        'qux': {'dependency': 'python3-qux', 'standard': 'PEP386'},
+        'quux': {'dependency': 'python3-quux', 'standard': 'PEP386'},
+    }
+    dist_info_metadata = {
+        'debian/foo/usr/lib/python3/dist-packages/foo.dist-info/METADATA': (
+            'Requires-Dist: bar',
+            'Requires-Dist: baz >= 1.0',
+            'Requires-Dist: qux == 1.*',
+            'Requires-Dist: quux ~= 1.1',
+        ),
+    }
+
+    def test_depends_on_bar(self):
+        self.assertIn('python3-bar', self.d.depends)
+
+    def test_depends_on_baz(self):
+        self.assertIn('python3-baz (>= 1.0)', self.d.depends)
+
+    def test_depends_on_qux(self):
+        self.assertIn('python3-qux (>= 1.0), python3-qux (<< 2)',
+                      self.d.depends)
+
+    def test_depends_on_quux(self):
+        self.assertIn('python3-quux (>= 1.1), python3-quux (<< 2)',
+                      self.d.depends)
+
+
+class TestEnvironmentMarkersDistInfo(DependenciesTestCase):
+    options = FakeOptions(guess_deps=True, depends_section=['feature'])
+    pydist = pep386({
+        'no_markers': 'python3-no-markers',
+        'os_posix': 'python3-os-posix',
+        'os_java': 'python3-os-java',
+        'sys_platform_linux': 'python3-sys-platform-linux',
+        'sys_platform_darwin': 'python3-sys-platform-darwin',
+        'platform_machine_x86_64': 'python3-platform-machine-x86-64',
+        'platform_machine_mips64': 'python3-platform-machine-mips64',
+        'platform_python_implementation_cpython':
+            'python3-platform-python-implementation-cpython',
+        'platform_python_implementation_jython':
+            'python3-platform-python-implementation-jython',
+        'platform_release_lt2': 'python3-platform-release-lt2',
+        'platform_release_ge2': 'python3-platform-release-ge2',
+        'platform_system_linux': 'python3-platform-system-linux',
+        'platform_system_windows': 'python3-platform-system-windows',
+        'platform_version_lt1': 'python3-platform-version-lt1',
+        'platform_version_ge1': 'python3-platform-version-ge1',
+        'python_version_ge3': 'python3-python-version-ge3',
+        'python_version_gt3': 'python3-python-version-gt3',
+        'python_version_lt3': 'python3-python-version-lt3',
+        'python_version_lt30': 'python3-python-version-lt30',
+        'python_version_lt35': 'python3-python-version-lt35',
+        'python_version_le35': 'python3-python-version-le35',
+        'python_version_ge27': 'python3-python-version-ge27',
+        'python_version_ge35': 'python3-python-version-ge35',
+        'python_version_gt35': 'python3-python-version-gt35',
+        'python_version_eq35': 'python3-python-version-eq35',
+        'python_version_ne35': 'python3-python-version-ne35',
+        'python_version_aeq35': 'python3-python-version-aeq35',
+        'python_version_ceq35': 'python3-python-version-ceq35',
+        'python_version_weq35': 'python3-python-version-weq35',
+        'python_version_full_lt300': 'python3-python-version-full-lt300',
+        'python_version_full_lt351': 'python3-python-version-full-lt351',
+        'python_version_full_le351': 'python3-python-version-full-le351',
+        'python_version_full_ge351': 'python3-python-version-full-ge351',
+        'python_version_full_ge351a1': 'python3-python-version-full-ge351a1',
+        'python_version_full_ge351b1post1':
+            'python3-python-version-full-ge351b1post1',
+        'python_version_full_gt351': 'python3-python-version-full-gt351',
+        'python_version_full_eq351': 'python3-python-version-full-eq351',
+        'python_version_full_ne351': 'python3-python-version-full-ne351',
+        'python_version_full_aeq351': 'python3-python-version-full-aeq351',
+        'python_version_full_ceq351': 'python3-python-version-full-ceq351',
+        'python_version_full_weq35': 'python3-python-version-full-weq35',
+        'implementation_name_cpython': 'python3-implementation-name-cpython',
+        'implementation_name_pypy': 'python3-implementation-name-pypy',
+        'implementation_version_lt35': 'python3-implementation-version-lt35',
+        'implementation_version_ge35': 'python3-implementation-version-ge35',
+        'invalid_marker': 'python3-invalid-marker',
+        'extra_feature': 'python3-extra-feature',
+        'extra_test': 'python3-extra-test',
+        'complex_marker': 'python3-complex-marker',
+        'complex_marker_2': 'python3-complex-marker-2',
+        'no_markers_2': 'python3-no-markers-2',
+    })
+    dist_info_metadata = {
+        'debian/foo/usr/lib/python3/dist-packages/foo.dist-info/METADATA': (
+            "Requires-Dist: no_markers",
+            "Requires-Dist: os_posix; (os_name == 'posix')",
+            'Requires-Dist: os_java; os_name == "java"',
+            "Requires-Dist: sys_platform_linux ; sys_platform == 'linux'",
+            "Requires-Dist: sys_platform_darwin;sys_platform == 'darwin'",
+            "Requires-Dist: platform_machine_x86_64; "
+                "platform_machine == 'x86_64'",
+            "Requires-Dist: platform_machine_mips64; "
+                "platform_machine == 'mips64'",
+            "Requires-Dist: platform_python_implementation_cpython; "
+                "platform_python_implementation == 'CPython'",
+            "Requires-Dist: platform_python_implementation_jython; "
+                "platform_python_implementation == 'Jython'",
+            "Requires-Dist: platform_release_lt2; platform_release < '2.0'",
+            "Requires-Dist: platform_release_ge2; platform_release >= '2.0'",
+            "Requires-Dist: platform_system_linux; platform_system == 'Linux'",
+            "Requires-Dist: platform_system_windows; "
+                "platform_system == 'Windows'",
+            "Requires-Dist: platform_version_lt1; platform_version < '1'",
+            "Requires-Dist: platform_version_ge1; platform_version >= '1'",
+            "Requires-Dist: python_version_ge3; python_version >= '3'",
+            "Requires-Dist: python_version_gt3; python_version > '3'",
+            "Requires-Dist: python_version_lt3; python_version < '3'",
+            "Requires-Dist: python_version_lt30; python_version < '3.0'",
+            "Requires-Dist: python_version_lt35; python_version < '3.5'",
+            "Requires-Dist: python_version_le35; python_version <= '3.5'",
+            "Requires-Dist: python_version_gt35; python_version > '3.5'",
+            "Requires-Dist: python_version_ge27; python_version >= '2.7'",
+            "Requires-Dist: python_version_ge35; python_version >= '3.5'",
+            "Requires-Dist: python_version_eq35; python_version == '3.5'",
+            "Requires-Dist: python_version_ne35; python_version != '3.5'",
+            "Requires-Dist: python_version_aeq35; python_version === '3.5'",
+            "Requires-Dist: python_version_ceq35; python_version ~= '3.5'",
+            "Requires-Dist: python_version_weq35; python_version == '3.5.*'",
+            "Requires-Dist: python_version_full_lt300; "
+                "python_full_version < '3.0.0'",
+            "Requires-Dist: python_version_full_lt351; "
+                "python_full_version < '3.5.1'",
+            "Requires-Dist: python_version_full_le351; "
+                "python_full_version <= '3.5.1'",
+            "Requires-Dist: python_version_full_gt351; "
+                "python_full_version > '3.5.1'",
+            "Requires-Dist: python_version_full_ge351; "
+                "python_full_version >= '3.5.1'",
+            "Requires-Dist: python_version_full_ge351a1; "
+                "python_full_version >= '3.5.1a1'",
+            "Requires-Dist: python_version_full_ge351b1post1; "
+                "python_full_version >= '3.5.1b1.post1'",
+            "Requires-Dist: python_version_full_eq351; "
+                "python_full_version == '3.5.1'",
+            "Requires-Dist: python_version_full_ne351; "
+                "python_full_version != '3.5.1'",
+            "Requires-Dist: python_version_full_aeq351; "
+                "python_full_version === '3.5.1'",
+            "Requires-Dist: python_version_full_ceq351; "
+                "python_full_version ~= '3.5.1'",
+            "Requires-Dist: python_version_full_weq35; "
+                "python_full_version == '3.5.*'",
+            "Requires-Dist: implementation_name_cpython; "
+                "implementation_name == 'cpython'",
+            "Requires-Dist: implementation_name_pypy; "
+                "implementation_name == 'pypy'",
+            "Requires-Dist: implementation_version_lt35; "
+                "implementation_version < '3.5'",
+            "Requires-Dist: implementation_version_ge35; "
+                "implementation_version >= '3.5'",
+            "Requires-Dist: invalid_marker; invalid_marker > '1'",
+            "Requires-Dist: extra_feature; extra == 'feature'",
+            "Requires-Dist: extra_test; extra == 'test'",
+            "Requires-Dist: complex_marker; os_name != 'windows' "
+                "and implementation_name == 'cpython'",
+            "Requires-Dist: complex_marker_2; (python_version > \"3.4\") "
+                "and extra == 'test'",
+            "Requires-Dist: no_markers_2",
+        ),
+    }
+
+    def test_depends_on_unmarked_packages(self):
+        self.assertIn('python3-no-markers', self.d.depends)
+
+    def test_depends_on_posix_packages(self):
+        self.assertIn('python3-os-posix', self.d.depends)
+
+    def test_skips_non_posix_packages(self):
+        self.assertNotInDepends('python3-os-java')
+
+    def test_depends_on_linux_packages(self):
+        self.assertIn('python3-sys-platform-linux', self.d.depends)
+
+    def test_skips_darwin_packages(self):
+        self.assertNotInDepends('python3-sys-platform-darwin')
+
+    def test_depends_on_x86_64_packages_on_x86_64(self):
+        if platform.machine() == 'x86_64':
+            self.assertIn('python3-platform-machine-x86-64', self.d.depends)
+        else:
+            self.assertNotInDepends('python3-platform-machine-x86-64')
+
+    def test_depends_on_mips64_packages_on_mips64(self):
+        if platform.machine() == 'mips64':
+            self.assertIn('python3-platform-machine-mips64', self.d.depends)
+        else:
+            self.assertNotInDepends('python3-platform-machine-mips64')
+
+    def test_depends_on_plat_cpython_packages(self):
+        self.assertIn('python3-platform-python-implementation-cpython',
+                      self.d.depends)
+
+    def test_skips_plat_jython_packages(self):
+        self.assertNotInDepends('python3-platform-python-implementation-jython')
+
+    def test_skips_release_lt_2_packages(self):
+        self.assertNotInDepends('python3-platform-release-lt2')
+
+    def test_skips_release_gt_2_packages(self):
+        self.assertNotInDepends('python3-platform-release-ge2')
+
+    def test_depends_on_platform_linux_packages(self):
+        self.assertIn('python3-platform-system-linux', self.d.depends)
+
+    def test_skips_platform_windows_packages(self):
+        self.assertNotInDepends('python3-platform-system-windows')
+
+    def test_skips_platfrom_version_lt_1_packages(self):
+        self.assertNotInDepends('python3-platform-version-lt1')
+
+    def test_skips_platform_version_ge_1_packages(self):
+        self.assertNotInDepends('python3-platform-version-ge1')
+
+    def test_skips_py_version_lt_3_packages(self):
+        self.assertNotInDepends('python3-python-version-lt3')
+
+    def test_elides_py_version_ge_3(self):
+        self.assertIn('python3-python-version-ge3', self.d.depends)
+
+    def test_elides_py_version_gt_3(self):
+        self.assertIn('python3-python-version-gt3', self.d.depends)
+
+    def test_skips_py_version_lt_30_packages(self):
+        self.assertNotInDepends('python3-python-version-lt30')
+
+    def test_depends_on_py_version_lt_35_packages(self):
+        self.assertIn('python3-python-version-lt35 | python3 (>> 3.5)',
+                      self.d.depends)
+
+    def test_depends_on_py_version_le_35_packages(self):
+        self.assertIn('python3-python-version-le35 | python3 (>> 3.6)',
+                      self.d.depends)
+
+    def test_depends_on_py_version_ge_27_packages(self):
+        self.assertIn('python3-python-version-ge27',
+                      self.d.depends)
+
+    def test_depends_on_py_version_ge_35_packages(self):
+        self.assertIn('python3-python-version-ge35 | python3 (<< 3.5)',
+                      self.d.depends)
+
+    def test_depends_on_py_version_gt_35_packages(self):
+        self.assertIn('python3-python-version-gt35 | python3 (<< 3.6)',
+                      self.d.depends)
+
+    def test_depends_on_py_version_eq_35_packages(self):
+        self.assertIn('python3-python-version-eq35 | python3 (<< 3.5) '
+                      '| python3 (>> 3.6)', self.d.depends)
+
+    def test_depends_on_py_version_ne_35_packages(self):
+        # Can't be represented in Debian depends
+        self.assertIn('python3-python-version-ne35', self.d.depends)
+
+    def test_depends_on_py_version_aeq_35_packages(self):
+        self.assertIn('python3-python-version-aeq35 | python3 (<< 3.5) '
+                      '| python3 (>> 3.6)', self.d.depends)
+
+    def test_depends_on_py_version_ceq_35_packages(self):
+        self.assertIn('python3-python-version-ceq35 | python3 (<< 3.5) '
+                      '| python3 (>> 3.6)', self.d.depends)
+
+    def test_depends_on_py_version_weq_35_packages(self):
+        self.assertIn('python3-python-version-weq35 | python3 (<< 3.5) '
+                      '| python3 (>> 3.6)', self.d.depends)
+
+    def test_skips_py_version_full_lt_300_packages(self):
+        self.assertNotInDepends('python3-python-version-full-lt300')
+
+    def test_depends_on_py_version_full_lt_351_packages(self):
+        self.assertIn('python3-python-version-full-lt351 | python3 (>> 3.5.1)',
+                      self.d.depends)
+
+    def test_depends_on_py_version_full_le_351_packages(self):
+        self.assertIn('python3-python-version-full-le351 | python3 (>> 3.5.2)',
+                      self.d.depends)
+
+    def test_depends_on_py_version_full_ge_351_packages(self):
+        self.assertIn('python3-python-version-full-ge351 | python3 (<< 3.5.1)',
+                      self.d.depends)
+
+    def test_depends_on_py_version_full_ge_351a1_packages(self):
+        # With full PEP-440 parsing this should be (<< 3.5.1~a1)
+        self.assertIn(
+            'python3-python-version-full-ge351a1 | python3 (<< 3.5.0)',
+            self.d.depends)
+
+    def test_depends_on_py_version_full_ge_351b1post1_packages(self):
+        # With full PEP-440 parsing this should be (<< 3.5.1~b1.post1)
+        self.assertIn('python3-python-version-full-ge351a1 '
+                      '| python3 (<< 3.5.0)',
+                      self.d.depends)
+
+    def test_depends_on_py_version_full_gt_351_packages(self):
+        self.assertIn('python3-python-version-full-gt351 | python3 (<< 3.5.2)',
+                      self.d.depends)
+
+    def test_depends_on_py_version_full_eq_351_packages(self):
+        self.assertIn('python3-python-version-full-eq351 | python3 (<< 3.5.1) '
+                      '| python3 (>> 3.5.2)', self.d.depends)
+
+    def test_depends_on_py_version_full_ne_351_packages(self):
+        # Can't be represented in Debian depends
+        self.assertIn('python3-python-version-full-ne351', self.d.depends)
+
+    def test_skips_py_version_full_aeq_351_packages(self):
+        # Can't be represented in Debian depends
+        self.assertNotInDepends('python3-python-version-full-aeq351')
+
+    def test_depends_on_py_version_full_ceq_351_packages(self):
+        self.assertIn('python3-python-version-full-ceq351 | python3 (<< 3.5.1) '
+                      '| python3 (>> 3.6)', self.d.depends)
+
+    def test_depends_on_py_version_full_weq_35_packages(self):
+        self.assertIn('python3-python-version-full-weq35 | python3 (<< 3.5) '
+                      '| python3 (>> 3.6)', self.d.depends)
+
+    def test_depends_on_sys_cpython_packages(self):
+        self.assertIn('python3-implementation-name-cpython', self.d.depends)
+
+    def test_depends_on_sys_pypy_packages(self):
+        self.assertIn('python3-implementation-name-pypy', self.d.depends)
+
+    def test_depends_on_sys_implementation_lt35_packages(self):
+        self.assertIn('python3-implementation-version-lt35 | python3 (>> 3.5)',
+                      self.d.depends)
+
+    def test_depends_on_sys_implementation_ge35_packages(self):
+        self.assertIn('python3-implementation-version-ge35 | python3 (<< 3.5)',
+                      self.d.depends)
+
+    def test_ignores_invalid_marker(self):
+        self.assertNotInDepends('python3-invalid-marker')
+
+    def test_depends_on_extra_feature_packages(self):
+        self.assertIn('python3-extra-feature', self.d.depends)
+
+    def test_skips_extra_test_packages(self):
+        self.assertNotInDepends('python3-extra-test')
+
+    def test_ignores_complex_environment_markers(self):
+        self.assertNotInDepends('python3-complex-marker')
+        self.assertNotInDepends('python3-complex-marker-2')
+
+    def test_depends_on_un_marked_dependency_after_extra(self):
+        self.assertIn('python3-no-markers-2', self.d.depends)
+
+
+class TestEnvironmentMarkersEggInfo(TestEnvironmentMarkersDistInfo):
+    dist_info_metadata = None
+    requires = {
+        'debian/foo/usr/lib/python3/dist-packages/foo.egg-info/requires.txt': (
+            "no_markers",
+            "[:(os_name == 'posix')]",
+            "os_posix",
+            '[:os_name == "java"]',
+            "os_java",
+            "[:sys_platform == 'linux']",
+            "sys_platform_linux",
+            "[:sys_platform == 'darwin']",
+            "sys_platform_darwin",
+            "[:platform_machine == 'x86_64']",
+            "platform_machine_x86_64",
+            "[:platform_machine == 'mips64']",
+            "platform_machine_mips64",
+            "[:platform_python_implementation == 'CPython']",
+            "platform_python_implementation_cpython",
+            "[:platform_python_implementation == 'Jython']",
+            "platform_python_implementation_jython",
+            "[:platform_release < '2.0']",
+            "platform_release_lt2",
+            "[:platform_release >= '2.0']",
+            "platform_release_ge2",
+            "[:platform_system == 'Linux']",
+            "platform_system_linux",
+            "[:platform_system == 'Windows']",
+            "platform_system_windows",
+            "[:platform_version < '1']",
+            "platform_version_lt1",
+            "[:platform_version >= '1']",
+            "platform_version_ge1",
+            "[:python_version >= '3']",
+            "python_version_ge3",
+            "[:python_version > '3']",
+            "python_version_gt3",
+            "[:python_version < '3']",
+            "python_version_lt3",
+            "[:python_version < '3.0']",
+            "python_version_lt30",
+            "[:python_version < '3.5']",
+            "python_version_lt35",
+            "[:python_version <= '3.5']",
+            "python_version_le35",
+            "[:python_version > '3.5']",
+            "python_version_gt35",
+            "[:python_version >= '2.7']",
+            "python_version_ge27",
+            "[:python_version >= '3.5']",
+            "python_version_ge35",
+            "[:python_version == '3.5']",
+            "python_version_eq35",
+            "[:python_version != '3.5']",
+            "python_version_ne35",
+            "[:python_version === '3.5']",
+            "python_version_aeq35",
+            "[:python_version ~= '3.5']",
+            "python_version_ceq35",
+            "[:python_version == '3.5.*']",
+            "python_version_weq35",
+            "[:python_full_version < '3.0.0']",
+            "python_version_full_lt300",
+            "[:python_full_version < '3.5.1']",
+            "python_version_full_lt351",
+            "[:python_full_version <= '3.5.1']",
+            "python_version_full_le351",
+            "[:python_full_version > '3.5.1']",
+            "python_version_full_gt351",
+            "[:python_full_version >= '3.5.1']",
+            "python_version_full_ge351",
+            "[:python_full_version >= '3.5.1a1']",
+            "python_version_full_ge351a1",
+            "[:python_full_version >= '3.5.1b1.post1']",
+            "python_version_full_ge351b1post1",
+            "[:python_full_version == '3.5.1']",
+            "python_version_full_eq351",
+            "[:python_full_version != '3.5.1']",
+            "python_version_full_ne351",
+            "[:python_full_version === '3.5.1']",
+            "python_version_full_aeq351",
+            "[:python_full_version ~= '3.5.1']",
+            "python_version_full_ceq351",
+            "[:python_full_version == '3.5.*']",
+            "python_version_full_weq35",
+            "[:implementation_name == 'cpython']",
+            "implementation_name_cpython",
+            "[:implementation_name == 'pypy']",
+            "implementation_name_pypy",
+            "[:implementation_version < '3.5']",
+            "implementation_version_lt35",
+            "[:implementation_version >= '3.5']",
+            "implementation_version_ge35",
+            "[:invalid_marker > '1']",
+            "invalid_marker",
+            "[feature]",
+            "extra_feature",
+            "[test]",
+            "extra_test",
+            "[:os_name != 'windows' and implementation_name == 'cpython']",
+            "complex_marker",
+            "[test:(os_name != 'windows')]",
+            "complex_marker_2",
+        ),
+    }
+
+    def test_depends_on_un_marked_dependency_after_extra(self):
+        raise unittest.SkipTest('Not possible in requires.txt')
+
+
+class TestEnvironmentMarkers27EggInfo(DependenciesTestCase):
+    options = FakeOptions(guess_deps=True)
+    impl = 'cpython2'
+    requires = {
+        'debian/foo/usr/lib/python2.7/dist-packages/foo.egg-info/requires.txt': (
+            "no_markers",
+            "[:os_name == 'posix']",
+            "os_posix",
+            "[:python_version >= '2.6']",
+            "python_version_ge26",
+        )
+    }
+    pydist = py27({
+        'no_markers': 'python-no-markers',
+        'os_posix': 'python-os-posix',
+        'python_version_ge26': 'python-python-version-ge26',
+    })
+
+    def test_depends_on_unmarked_packages(self):
+        self.assertIn('python-no-markers', self.d.depends)
+
+    def test_ignores_posix_packages(self):
+        self.assertNotInDepends('python-os-posix')
+
+    def test_ignores_pyversion_packages(self):
+        self.assertNotInDepends('python-python-version-ge26')
+
+
+class TestIgnoresUnusedModulesDistInfo(DependenciesTestCase):
+    options = FakeOptions(guess_deps=True, depends_section=['feature'])
+    dist_info_metadata = {
+        'debian/foo/usr/lib/python3/dist-packages/foo.dist-info/METADATA': (
+            "Requires-Dist: unusued-complex-module ; "
+                "(sys_platform == \"darwin\") and extra == 'nativelib'",
+            "Requires-Dist: unused-win-module ; (sys_platform == \"win32\")",
+            "Requires-Dist: unused-extra-module ; extra == 'unused'",
+        ),
+    }
+    parse = False
+
+    def test_ignores_unused_dependencies(self):
+        if not hasattr(self, 'assertLogs'):
+            raise unittest.SkipTest("Requires Python >= 3.4")
+        with self.assertLogs(logger='dhpython', level=logging.INFO) as logs:
+            self.d.parse(self.prepared_stats, self.options)
+        for line in logs.output:
+            self.assertTrue(
+                line.startswith(
+                    'INFO:dhpython:Ignoring complex environment marker'),
+                'Expecting only complex environment marker messages, but '
+                'got: {}'.format(line))
+
+
+class TestIgnoresUnusedModulesEggInfo(DependenciesTestCase):
+    options = FakeOptions(guess_deps=True, depends_section=['feature'])
+    requires = {
+        'debian/foo/usr/lib/python3/dist-packages/foo.egg-info/requires.txt': (
+            "[nativelib:(sys_platform == 'darwin')]",
+            "unusued-complex-module",
+            "[:sys_platform == 'win32']",
+            "unused-win-module",
+            "[unused]",
+            "unused-extra-module",
+        )
+    }
+    parse = False
+
+    def test_ignores_unused_dependencies(self):
+        if not hasattr(self, 'assertNoLogs'):
+            raise unittest.SkipTest("Requires Python >= 3.10")
+        with self.assertNoLogs(logger='dhpython', level=logging.INFO):
+            self.d.parse(self.prepared_stats, self.options)
diff --git a/tests/test_fs.py b/tests/test_fs.py
new file mode 100644
index 0000000..c458fe8
--- /dev/null
+++ b/tests/test_fs.py
@@ -0,0 +1,145 @@
+from tempfile import TemporaryDirectory
+from pathlib import Path
+from unittest import TestCase
+
+from dhpython.interpreter import Interpreter
+from dhpython.fs import (
+    fix_merged_RECORD, merge_RECORD, merge_WHEEL, missing_lines, share_files)
+
+from tests.common import FakeOptions
+
+
+class MergeWheelTestCase(TestCase):
+    files = {}
+    def setUp(self):
+        self.tempdir = TemporaryDirectory()
+        self.addCleanup(self.tempdir.cleanup)
+        temp_path = Path(self.tempdir.name)
+        for fn, contents in self.files.items():
+            path = temp_path / fn
+            setattr(self, path.name, path)
+            path.parent.mkdir(parents=True, exist_ok=True)
+            with path.open('w') as f:
+                f.write('\n'.join(contents))
+                f.write('\n')
+
+    def assertFileContents(self, path, contents):
+        """Assert that the contents of path is contents
+
+        Contents may be specified as a list of strings, one per line, without
+        line-breaks.
+        """
+        if isinstance(contents, (list, tuple)):
+            contents = '\n'.join(contents) + '\n'
+        with path.open('r') as f:
+            self.assertMultiLineEqual(contents, f.read())
+
+
+class SimpleCombinationTest(MergeWheelTestCase):
+    files = {
+        'a': ('abc', 'def'),
+        'b': ('abc', 'ghi'),
+    }
+    def test_missing_lines(self):
+        r = missing_lines(self.a, self.b)
+        self.assertEqual(r, ['def\n'])
+
+    def test_merge_record(self):
+        merge_RECORD(self.a, self.b)
+        self.assertFileContents(self.b, ('abc', 'ghi', 'def'))
+
+
+class MergeTagsTest(MergeWheelTestCase):
+    files = {
+        'a': ('foo', 'Tag: A'),
+        'b': ('foo', 'Tag: B'),
+    }
+
+    def test_merge_wheel(self):
+        merge_WHEEL(self.a, self.b)
+        self.assertFileContents(self.b, ('foo', 'Tag: B', 'Tag: A'))
+
+
+class UpdateRecordTest(MergeWheelTestCase):
+    files = {
+        'dist-info/RECORD': ('dist-info/FOO,sha256=b5bb9d8014a0f9b1d61e21e796d7'
+                             '8dccdf1352f23cd32812f4850b878ae4944c,4',),
+        'dist-info/WHEEL': ('foo'),
+    }
+
+    def test_fix_merged_record(self):
+        fix_merged_RECORD(self.RECORD.parent)
+        self.assertFileContents(self.RECORD, (
+            'dist-info/FOO,sha256=b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32'
+            '812f4850b878ae4944c,4',
+            'dist-info/WHEEL,sha256=447fb61fa39a067229e1cce8fc0953bfced53eac85d'
+            '1844f5940f51c1fcba725,6',
+        ))
+
+
+class ShareFilesTestCase(MergeWheelTestCase):
+    impl = 'cpython3'
+    options = {}
+
+    def setUp(self):
+        super().setUp()
+        self.destdir = TemporaryDirectory()
+        self.addCleanup(self.destdir.cleanup)
+        share_files(self.tempdir.name, self.destdir.name,
+                    Interpreter(self.impl),
+                    FakeOptions(**self.options))
+
+    def destPath(self, name):
+        return Path(self.destdir.name) / name
+
+
+class HatchlingLicenseTest(ShareFilesTestCase):
+    files = {
+        'foo.dist-info/license_files/LICENSE.txt': ('foo'),
+        'foo.dist-info/licenses/COPYING': ('foo'),
+        'foo.dist-info/RECORD': (
+            'foo.dist-info/license_files/LICENSE.txt,sha256=2c26b46b68ffc68ff99'
+            'b453c1d30413413422d706483bfa0f98a5e886266e7ae,4',
+            'foo.dist-info/licenses/COPYING,sha256=2c26b46b68ffc68ff99b453c1d30'
+            '413413422d706483bfa0f98a5e886266e7ae,4',
+            'foo.dist-info/WHEEL,sha256=447fb61fa39a067229e1cce8fc0953bfced53ea'
+            'c85d1844f5940f51c1fcba725,6'),
+        'foo.dist-info/WHEEL': ('foo'),
+    }
+
+    def test_removes_license_files(self):
+        self.assertFalse(
+            self.destPath('foo.dist-info/license_files/LICENSE.txt').exists())
+        self.assertFalse(
+            self.destPath('foo.dist-info/licenses/COPYING').exists())
+
+    def test_removes_license_files_from_record(self):
+        print("Checking", self.destPath('foo.dist-info/RECORD'))
+        self.assertFileContents(self.destPath('foo.dist-info/RECORD'),
+            'foo.dist-info/WHEEL,sha256=447fb61fa39a067229e1cce8fc0953bfced53ea'
+            'c85d1844f5940f51c1fcba725,6\n')
+
+
+class FlitLicenseTest(ShareFilesTestCase):
+    files = {
+        'foo.dist-info/COPYING': ('foo'),
+        'foo.dist-info/COPYING.LESSER': ('foo'),
+        'foo.dist-info/RECORD': (
+            'foo.dist-info/COPYING,sha256=2c26b46b68ffc68ff99b453c1d30413413422'
+            'd706483bfa0f98a5e886266e7ae,4',
+            'foo.dist-info/COPYING.LESSER,sha256=2c26b46b68ffc68ff99b453c1d3041'
+            '3413422d706483bfa0f98a5e886266e7ae,4',
+            'foo.dist-info/WHEEL,sha256=447fb61fa39a067229e1cce8fc0953bfced53ea'
+            'c85d1844f5940f51c1fcba725,6'),
+        'foo.dist-info/WHEEL': ('foo'),
+    }
+
+    def test_removes_license_files(self):
+        self.assertFalse(self.destPath('foo.dist-info/COPYING.LESSER').exists())
+        self.assertFalse(self.destPath('foo.dist-info/COPYING').exists())
+
+    def test_removes_license_files_from_record(self):
+        print("Checking", self.destPath('foo.dist-info/RECORD'))
+        self.assertFileContents(self.destPath('foo.dist-info/RECORD'),
+            'foo.dist-info/WHEEL,sha256=447fb61fa39a067229e1cce8fc0953bfced53ea'
+            'c85d1844f5940f51c1fcba725,6\n')
diff --git a/tests/test_interpreter.py b/tests/test_interpreter.py
new file mode 100644
index 0000000..ff9bdd2
--- /dev/null
+++ b/tests/test_interpreter.py
@@ -0,0 +1,250 @@
+import unittest
+from os import environ
+from os.path import exists
+from dhpython.interpreter import Interpreter
+
+
+class TestInterpreter(unittest.TestCase):
+    def setUp(self):
+        self._triplet = environ.get('DEB_HOST_MULTIARCH')
+        environ['DEB_HOST_MULTIARCH'] = 'MYARCH'
+
+    def tearDown(self):
+        if self._triplet:
+            environ['DEB_HOST_MULTIARCH'] = self._triplet
+
+    @unittest.skipUnless(exists('/usr/bin/pypy'), 'pypy is not installed')
+    def test_pypy(self):
+        sorted(Interpreter.parse('pypy').items()) == \
+            [('debug', None), ('name', 'pypy'), ('options', ()), ('path', ''), ('version', None)]
+        sorted(Interpreter.parse('#! /usr/bin/pypy --foo').items()) == \
+            [('debug', None), ('name', 'pypy'), ('options', ('--foo',)), ('path', '/usr/bin/'), ('version', None)]
+        Interpreter('pypy').sitedir(version='2.0') == '/usr/lib/pypy/dist-packages/'
+
+    @unittest.skipUnless(exists('/usr/bin/python2.6'), 'python2.6 is not installed')
+    def test_python26(self):
+        i = Interpreter('python2.6')
+        self.assertEqual(i.soabi(), '')
+        self.assertIsNone(i.check_extname('foo.so'))
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertIsNone(i.check_extname('foo/bar/bazmodule.so'))
+
+    @unittest.skipUnless(exists('/usr/bin/python2.6-dbg'), 'python2.6-dbg is not installed')
+    def test_python26dbg(self):
+        i = Interpreter('python2.6-dbg')
+        self.assertEqual(i.soabi(), '')
+        self.assertIsNone(i.check_extname('foo_d.so'))
+        self.assertEqual(i.check_extname('foo.so'), 'foo_d.so')
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), 'foo/bar/bazmodule_d.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python2.7'), 'python2.7 is not installed')
+    def test_python27(self):
+        i = Interpreter('python2.7')
+        self.assertEqual(i.soabi(), '')
+        self.assertEqual(i.check_extname('foo.so'), 'foo.MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.MYARCH_d.so'))
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertIsNone(i.check_extname('foo.OTHER.so'))  # different architecture
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), 'foo/bar/baz.MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python2.7-dbg'), 'python2.7-dbg is not installed')
+    def test_python27dbg(self):
+        i = Interpreter('python2.7-dbg')
+        self.assertEqual(i.soabi(), '')
+        self.assertEqual(i.check_extname('foo.so'), 'foo.MYARCH_d.so')
+        self.assertEqual(i.check_extname('foo_d.so'), 'foo.MYARCH_d.so')
+        self.assertIsNone(i.check_extname('foo.MYARCH_d.so'))
+        self.assertIsNone(i.check_extname('foo.OTHER_d.so'))  # different architecture
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), 'foo/bar/baz.MYARCH_d.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.1'), 'python3.1 is not installed')
+    def test_python31(self):
+        i = Interpreter('python3.1')
+        self.assertEqual(i.soabi(), '')
+        self.assertIsNone(i.check_extname('foo.so'))
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertIsNone(i.check_extname('foo/bar/bazmodule.so'))
+
+    @unittest.skipUnless(exists('/usr/bin/python3.1-dbg'), 'python3.1-dbg is not installed')
+    def test_python31dbg(self):
+        i = Interpreter('python3.1-dbg')
+        self.assertEqual(i.soabi(), '')
+        self.assertIsNone(i.check_extname('foo.so'))
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertIsNone(i.check_extname('foo/bar/bazmodule.so'))
+
+    @unittest.skipUnless(exists('/usr/bin/python3.2'), 'python3.2 is not installed')
+    def test_python32(self):
+        i = Interpreter('python3.2')
+        self.assertEqual(i.soabi(), 'cpython-32mu')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-32mu.so')
+        self.assertIsNone(i.check_extname('foo.cpython-33m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-32mu-OTHER.so'))  # different architecture
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/bazmodule.cpython-32mu.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.2-dbg'), 'python3.2-dbg is not installed')
+    def test_python32dbg(self):
+        i = Interpreter('python3.2-dbg')
+        self.assertEqual(i.soabi(), 'cpython-32dmu')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-32dmu.so')
+        self.assertIsNone(i.check_extname('foo.cpython-33m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-32dmu-OTHER.so'))  # different architecture
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/bazmodule.cpython-32dmu.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.4'), 'python3.4 is not installed')
+    def test_python34(self):
+        i = Interpreter('python3.4')
+        self.assertEqual(i.soabi(), 'cpython-34m')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-34m-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-34m-OTHER.so'))  # different architecture
+        self.assertEqual(i.check_extname('foo.cpython-34m.so'), r'foo.cpython-34m-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-34m-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.4-dbg'), 'python3.4-dbg is not installed')
+    def test_python34dbg(self):
+        i = Interpreter('python3.4-dbg')
+        self.assertEqual(i.soabi(), 'cpython-34dm')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-34dm-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-34m-OTHER.so'))  # different architecture
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-34dm-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.5'), 'python3.5 is not installed')
+    def test_python35(self):
+        i = Interpreter('python3.5')
+        self.assertEqual(i.soabi(), 'cpython-35m')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-35m-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-35m-OTHER.so'))  # different architecture
+        self.assertEqual(i.check_extname('foo.cpython-35m.so'), r'foo.cpython-35m-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-35m-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.5-dbg'), 'python3.5-dbg is not installed')
+    def test_python35dbg(self):
+        i = Interpreter('python3.5-dbg')
+        self.assertEqual(i.soabi(), 'cpython-35dm')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-35dm-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-35m-OTHER.so'))  # different architecture
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-35dm-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.6'), 'python3.6 is not installed')
+    def test_python36(self):
+        i = Interpreter('python3.6')
+        self.assertEqual(i.soabi(), 'cpython-36m')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-36m-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-36m-OTHER.so'))  # different architecture
+        self.assertEqual(i.check_extname('foo.cpython-36m.so'), r'foo.cpython-36m-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-36m-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.6-dbg'), 'python3.6-dbg is not installed')
+    def test_python36dbg(self):
+        i = Interpreter('python3.6-dbg')
+        self.assertEqual(i.soabi(), 'cpython-36dm')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-36dm-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-36m-OTHER.so'))  # different architecture
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-36dm-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.7'), 'python3.7 is not installed')
+    def test_python37(self):
+        i = Interpreter('python3.7')
+        self.assertEqual(i.soabi(), 'cpython-37m')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-37m-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-37m-OTHER.so'))  # different architecture
+        self.assertEqual(i.check_extname('foo.cpython-37m.so'), r'foo.cpython-37m-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-37m-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.7-dbg'), 'python3.7-dbg is not installed')
+    def test_python37dbg(self):
+        i = Interpreter('python3.7-dbg')
+        self.assertEqual(i.soabi(), 'cpython-37dm')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-37dm-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-37m-OTHER.so'))  # different architecture
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-37dm-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.8'), 'python3.8 is not installed')
+    def test_python38(self):
+        i = Interpreter('python3.8')
+        self.assertEqual(i.soabi(), 'cpython-38')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-38-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-38-OTHER.so'))  # different architecture
+        self.assertEqual(i.check_extname('foo.cpython-38.so'), r'foo.cpython-38-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-38-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.8-dbg'), 'python3.8-dbg is not installed')
+    def test_python38dbg(self):
+        i = Interpreter('python3.8-dbg')
+        self.assertEqual(i.soabi(), 'cpython-38d')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-38d-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-38-OTHER.so'))  # different architecture
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-38d-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.9'), 'python3.9 is not installed')
+    def test_python39(self):
+        i = Interpreter('python3.9')
+        self.assertEqual(i.soabi(), 'cpython-39')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-39-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-39-OTHER.so'))  # different architecture
+        self.assertEqual(i.check_extname('foo.cpython-39.so'), r'foo.cpython-39-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-39-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.9-dbg'), 'python3.9-dbg is not installed')
+    def test_python39dbg(self):
+        i = Interpreter('python3.9-dbg')
+        self.assertEqual(i.soabi(), 'cpython-39d')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-39d-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-39-OTHER.so'))  # different architecture
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-39d-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.10'), 'python3.10 is not installed')
+    def test_python310(self):
+        i = Interpreter('python3.10')
+        self.assertEqual(i.soabi(), 'cpython-310')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-310-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-310-OTHER.so'))  # different architecture
+        self.assertEqual(i.check_extname('foo.cpython-310.so'), r'foo.cpython-310-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-310-MYARCH.so')
+
+    @unittest.skipUnless(exists('/usr/bin/python3.10-dbg'), 'python3.10-dbg is not installed')
+    def test_python310dbg(self):
+        i = Interpreter('python3.10-dbg')
+        self.assertEqual(i.soabi(), 'cpython-310d')
+        self.assertEqual(i.check_extname('foo.so'), r'foo.cpython-310d-MYARCH.so')
+        self.assertIsNone(i.check_extname('foo.cpython-32m.so'))  # different version
+        self.assertIsNone(i.check_extname('foo.cpython-310-OTHER.so'))  # different architecture
+        self.assertIsNone(i.check_extname('foo.abi3.so'))
+        self.assertEqual(i.check_extname('foo/bar/bazmodule.so'), r'foo/bar/baz.cpython-310d-MYARCH.so')
+
+
+    def test_version(self):
+        i = Interpreter(impl='cpython2')
+        self.assertEqual(str(i), 'python')
+        self.assertEqual(i.binary('2.7'), '/usr/bin/python2.7')
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/test_tools.py b/tests/test_tools.py
new file mode 100644
index 0000000..55097e8
--- /dev/null
+++ b/tests/test_tools.py
@@ -0,0 +1,44 @@
+from tempfile import TemporaryDirectory
+import os
+import unittest
+
+from dhpython.tools import relpath, move_matching_files
+
+
+class TestRelpath(unittest.TestCase):
+    def test_common_parent_dir(self):
+        r = relpath('/usr/share/python-foo/foo.py', '/usr/bin/foo')
+        self.assertEqual(r, '../share/python-foo/foo.py')
+
+    def test_strips_common_prefix(self):
+        r = relpath('/usr/share/python-foo/foo.py', '/usr/share')
+        self.assertEqual(r, 'python-foo/foo.py')
+
+    def test_trailing_slash_ignored(self):
+        r = relpath('/usr/share/python-foo/foo.py', '/usr/share/')
+        self.assertEqual(r, 'python-foo/foo.py')
+
+
+class TestMoveMatchingFiles(unittest.TestCase):
+    def setUp(self):
+        self.tmpdir = TemporaryDirectory()
+        self.addCleanup(self.tmpdir.cleanup)
+        os.makedirs(self.tmppath('foo/bar/a/b/c/spam'))
+        for path in ('foo/bar/a/b/c/spam/file.so',
+                     'foo/bar/a/b/c/spam/file.py'):
+            open(self.tmppath(path), 'w').close()
+
+        move_matching_files(self.tmppath('foo/bar/'),
+                            self.tmppath('foo/baz/'),
+                            'spam/.*\.so$')
+
+    def tmppath(self, *path):
+        return os.path.join(self.tmpdir.name, *path)
+
+    def test_moved_matching_file(self):
+        self.assertTrue(os.path.exists(
+            self.tmppath('foo/baz/a/b/c/spam/file.so')))
+
+    def test_left_non_matching_file(self):
+        self.assertTrue(os.path.exists(
+            self.tmppath('foo/bar/a/b/c/spam/file.py')))
diff --git a/tests/tpb01/Makefile b/tests/tpb01/Makefile
new file mode 100644
index 0000000..b33b698
--- /dev/null
+++ b/tests/tpb01/Makefile
@@ -0,0 +1,9 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+check:
+	test -f debian/python3-foo/usr/lib/python3/dist-packages/foo.py
+	grep -q 'Depends:.*python3-tomli' debian/python3-foo/DEBIAN/control
+
+clean:
+	./debian/rules clean
diff --git a/tests/tpb01/debian/changelog b/tests/tpb01/debian/changelog
new file mode 100644
index 0000000..322011c
--- /dev/null
+++ b/tests/tpb01/debian/changelog
@@ -0,0 +1,5 @@
+foo (1.2.3) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ozarowski <piotr@debian.org>  Tue, 02 Jul 2013 11:02:06 +0200
diff --git a/tests/tpb01/debian/control b/tests/tpb01/debian/control
new file mode 100644
index 0000000..8b2e05f
--- /dev/null
+++ b/tests/tpb01/debian/control
@@ -0,0 +1,16 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper-compat (= 12)
+ , python3-all
+ , python3-setuptools
+ , python3-tomli
+# , dh-python
+Standards-Version: 3.9.4
+
+Package: python3-foo
+Architecture: all
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with public CPython modules
+ example package #1
diff --git a/tests/tpb01/debian/copyright b/tests/tpb01/debian/copyright
new file mode 100644
index 0000000..f96adde
--- /dev/null
+++ b/tests/tpb01/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2013, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/tpb01/debian/rules b/tests/tpb01/debian/rules
new file mode 100755
index 0000000..e8953b0
--- /dev/null
+++ b/tests/tpb01/debian/rules
@@ -0,0 +1,26 @@
+#!/usr/bin/make -f
+
+export PYBUILD_NAME=foo
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	../../pybuild --build
+
+override_dh_auto_install:
+	../../pybuild --install
+
+override_dh_auto_test:
+	../../pybuild --test
+
+override_dh_auto_clean:
+	../../pybuild --clean
+	rm -rf .pybuild foo.egg-info
+
+override_dh_installinit:
+	DH_VERBOSE=1 ../../dh_python3
+	dh_installinit
+
+override_dh_python3:
+	# ignore any system dh_python3
diff --git a/tests/tpb01/debian/source/format b/tests/tpb01/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/tpb01/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/tpb01/foo.py b/tests/tpb01/foo.py
new file mode 100644
index 0000000..810c96e
--- /dev/null
+++ b/tests/tpb01/foo.py
@@ -0,0 +1 @@
+"foo"
diff --git a/tests/tpb01/setup.cfg b/tests/tpb01/setup.cfg
new file mode 100644
index 0000000..112fd6c
--- /dev/null
+++ b/tests/tpb01/setup.cfg
@@ -0,0 +1,9 @@
+[metadata]
+name = foo
+
+[options]
+py_modules = foo
+install_requires =
+    tomli
+    mock; python_version < '3.1'
+    docutils; python_version >= '3.0'
diff --git a/tests/tpb01/setup.py b/tests/tpb01/setup.py
new file mode 100644
index 0000000..6068493
--- /dev/null
+++ b/tests/tpb01/setup.py
@@ -0,0 +1,3 @@
+from setuptools import setup
+
+setup()
diff --git a/tests/tpb02/Makefile b/tests/tpb02/Makefile
new file mode 100644
index 0000000..3a86c66
--- /dev/null
+++ b/tests/tpb02/Makefile
@@ -0,0 +1,19 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+DI=debian/python3-foo/usr/lib/python3/dist-packages/foo-0.1.dist-info
+
+check:
+	test -f debian/python3-foo/usr/lib/python3/dist-packages/foo/__init__.py
+	test -f debian/python3-foo/usr/bin/foo
+	grep -q ^foo/__init__.py, $(DI)/RECORD
+	test ! -f $(DI)/direct_url.json
+	grep -L ^foo-0.1.dist-info/direct_url.json, $(DI)/RECORD | grep -q RECORD
+	grep -q 'Depends:.*python3-tomli' debian/python3-foo/DEBIAN/control
+	grep -q 'Depends:.*python3-importlib-metadata \| python3 (>> 3\.5)' debian/python3-foo/DEBIAN/control
+	grep -L 'Depends:.*tox' debian/python3-foo/DEBIAN/control | grep -q control
+	find .pybuild -name test-executed | grep -q test-executed
+	test -f debian/python3-foo/usr/share/man/man1/foo.1.gz
+
+clean:
+	./debian/rules clean
diff --git a/tests/tpb02/data/share/man/man1/foo.1 b/tests/tpb02/data/share/man/man1/foo.1
new file mode 100644
index 0000000..3bf5dce
--- /dev/null
+++ b/tests/tpb02/data/share/man/man1/foo.1
@@ -0,0 +1,8 @@
+.TH foo 1 "December 5 2022"
+.SH NAME
+foo \- An example
+.SH SYNOPSIS
+.B foo
+.SH DESCRIPTION
+.B foo
+says hi.
diff --git a/tests/tpb02/debian/changelog b/tests/tpb02/debian/changelog
new file mode 100644
index 0000000..322011c
--- /dev/null
+++ b/tests/tpb02/debian/changelog
@@ -0,0 +1,5 @@
+foo (1.2.3) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ozarowski <piotr@debian.org>  Tue, 02 Jul 2013 11:02:06 +0200
diff --git a/tests/tpb02/debian/control b/tests/tpb02/debian/control
new file mode 100644
index 0000000..c775ede
--- /dev/null
+++ b/tests/tpb02/debian/control
@@ -0,0 +1,16 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper-compat (= 12)
+ , flit
+ , python3-all
+ , pybuild-plugin-pyproject
+# , dh-python
+Standards-Version: 3.9.4
+
+Package: python3-foo
+Architecture: all
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with public CPython modules
+ example package #1
diff --git a/tests/tpb02/debian/copyright b/tests/tpb02/debian/copyright
new file mode 100644
index 0000000..f96adde
--- /dev/null
+++ b/tests/tpb02/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2013, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/tpb02/debian/pybuild.testfiles b/tests/tpb02/debian/pybuild.testfiles
new file mode 100644
index 0000000..58c4d14
--- /dev/null
+++ b/tests/tpb02/debian/pybuild.testfiles
@@ -0,0 +1,3 @@
+testfile1.txt
+nested/testfile2.txt
+testdir
diff --git a/tests/tpb02/debian/rules b/tests/tpb02/debian/rules
new file mode 100755
index 0000000..e8953b0
--- /dev/null
+++ b/tests/tpb02/debian/rules
@@ -0,0 +1,26 @@
+#!/usr/bin/make -f
+
+export PYBUILD_NAME=foo
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	../../pybuild --build
+
+override_dh_auto_install:
+	../../pybuild --install
+
+override_dh_auto_test:
+	../../pybuild --test
+
+override_dh_auto_clean:
+	../../pybuild --clean
+	rm -rf .pybuild foo.egg-info
+
+override_dh_installinit:
+	DH_VERBOSE=1 ../../dh_python3
+	dh_installinit
+
+override_dh_python3:
+	# ignore any system dh_python3
diff --git a/tests/tpb02/debian/source/format b/tests/tpb02/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/tpb02/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/tpb02/foo/__init__.py b/tests/tpb02/foo/__init__.py
new file mode 100644
index 0000000..f29ed43
--- /dev/null
+++ b/tests/tpb02/foo/__init__.py
@@ -0,0 +1,6 @@
+"""An amazing sample package!"""
+
+__version__ = '0.1'
+
+def main():
+    print("Hello There")
diff --git a/tests/tpb02/foo/test_foo.py b/tests/tpb02/foo/test_foo.py
new file mode 100644
index 0000000..174b86b
--- /dev/null
+++ b/tests/tpb02/foo/test_foo.py
@@ -0,0 +1,11 @@
+from unittest import TestCase
+
+
+class RequiredTest(TestCase):
+    def test_tests_are_executed(self):
+        open('test-executed', 'w').close()
+
+    def test_testfiles_exist(self):
+        open('testfile1.txt').close()
+        open('testfile2.txt').close()
+        open('testdir/testfile3.txt').close()
diff --git a/tests/tpb02/nested/testfile2.txt b/tests/tpb02/nested/testfile2.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/tpb02/nested/testfile2.txt
diff --git a/tests/tpb02/pyproject.toml b/tests/tpb02/pyproject.toml
new file mode 100644
index 0000000..a20e0e7
--- /dev/null
+++ b/tests/tpb02/pyproject.toml
@@ -0,0 +1,22 @@
+[build-system]
+requires = ["flit_core >=2,<4"]
+build-backend = "flit_core.buildapi"
+
+[tool.flit.metadata]
+module = "foo"
+author = "Stefano Rivera"
+requires = [
+    "tomli",
+    "importlib-metadata ; python_version < '3.5'"
+]
+
+[tool.flit.metadata.requires-extra]
+test = [
+    "tox",
+]
+
+[tool.flit.scripts]
+foo = "foo:main"
+
+[tool.flit.external-data]
+directory = "data"
diff --git a/tests/tpb02/testdir/testfile3.txt b/tests/tpb02/testdir/testfile3.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/tpb02/testdir/testfile3.txt
diff --git a/tests/tpb02/testfile1.txt b/tests/tpb02/testfile1.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/tpb02/testfile1.txt
diff --git a/tests/tpb03/Makefile b/tests/tpb03/Makefile
new file mode 100644
index 0000000..5337be8
--- /dev/null
+++ b/tests/tpb03/Makefile
@@ -0,0 +1,10 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+check:
+	# FIXME: This used to be a 2.7 + 3.x test. It may not be useful any more, without 2.x
+	test -f debian/python3-foo/usr/lib/python3/dist-packages/foo.py
+	grep -q 'Depends:.*python3-pkg-resources' debian/python3-foo/DEBIAN/control
+
+clean:
+	./debian/rules clean
diff --git a/tests/tpb03/debian/changelog b/tests/tpb03/debian/changelog
new file mode 100644
index 0000000..322011c
--- /dev/null
+++ b/tests/tpb03/debian/changelog
@@ -0,0 +1,5 @@
+foo (1.2.3) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ozarowski <piotr@debian.org>  Tue, 02 Jul 2013 11:02:06 +0200
diff --git a/tests/tpb03/debian/control b/tests/tpb03/debian/control
new file mode 100644
index 0000000..e49d924
--- /dev/null
+++ b/tests/tpb03/debian/control
@@ -0,0 +1,15 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper-compat (= 12)
+ , python3-all
+ , python3-setuptools
+# , dh-python
+Standards-Version: 3.9.4
+
+Package: python3-foo
+Architecture: all
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with public CPython modules
+ example package #1
diff --git a/tests/tpb03/debian/copyright b/tests/tpb03/debian/copyright
new file mode 100644
index 0000000..f96adde
--- /dev/null
+++ b/tests/tpb03/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2013, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/tpb03/debian/rules b/tests/tpb03/debian/rules
new file mode 100755
index 0000000..e8953b0
--- /dev/null
+++ b/tests/tpb03/debian/rules
@@ -0,0 +1,26 @@
+#!/usr/bin/make -f
+
+export PYBUILD_NAME=foo
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	../../pybuild --build
+
+override_dh_auto_install:
+	../../pybuild --install
+
+override_dh_auto_test:
+	../../pybuild --test
+
+override_dh_auto_clean:
+	../../pybuild --clean
+	rm -rf .pybuild foo.egg-info
+
+override_dh_installinit:
+	DH_VERBOSE=1 ../../dh_python3
+	dh_installinit
+
+override_dh_python3:
+	# ignore any system dh_python3
diff --git a/tests/tpb03/debian/source/format b/tests/tpb03/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/tpb03/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/tpb03/foo.py b/tests/tpb03/foo.py
new file mode 100644
index 0000000..810c96e
--- /dev/null
+++ b/tests/tpb03/foo.py
@@ -0,0 +1 @@
+"foo"
diff --git a/tests/tpb03/setup.cfg b/tests/tpb03/setup.cfg
new file mode 100644
index 0000000..e60fea3
--- /dev/null
+++ b/tests/tpb03/setup.cfg
@@ -0,0 +1,7 @@
+[metadata]
+name = foo
+
+[options]
+py_modules = foo
+install_requires =
+    setuptools
diff --git a/tests/tpb03/setup.py b/tests/tpb03/setup.py
new file mode 100644
index 0000000..6068493
--- /dev/null
+++ b/tests/tpb03/setup.py
@@ -0,0 +1,3 @@
+from setuptools import setup
+
+setup()
diff --git a/tests/tpb04/Makefile b/tests/tpb04/Makefile
new file mode 100644
index 0000000..d1b6324
--- /dev/null
+++ b/tests/tpb04/Makefile
@@ -0,0 +1,10 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+check:
+	test -f debian/python3-foo/usr/lib/python3/dist-packages/foo.py
+	test -f debian/python3-foo-ext/usr/lib/python3/dist-packages/_foo.abi3.so
+	test -e test-executed
+
+clean:
+	./debian/rules clean
diff --git a/tests/tpb04/_foo.c b/tests/tpb04/_foo.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/tpb04/_foo.c
diff --git a/tests/tpb04/debian/changelog b/tests/tpb04/debian/changelog
new file mode 100644
index 0000000..322011c
--- /dev/null
+++ b/tests/tpb04/debian/changelog
@@ -0,0 +1,5 @@
+foo (1.2.3) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ozarowski <piotr@debian.org>  Tue, 02 Jul 2013 11:02:06 +0200
diff --git a/tests/tpb04/debian/control b/tests/tpb04/debian/control
new file mode 100644
index 0000000..f0643cf
--- /dev/null
+++ b/tests/tpb04/debian/control
@@ -0,0 +1,23 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper-compat (= 12)
+ , python3-all-dev
+ , python3-setuptools
+ , python3-tomli
+ , tox
+# , dh-python
+Standards-Version: 3.9.4
+
+Package: python3-foo
+Architecture: all
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with public CPython modules
+ example package #1
+
+Package: python3-foo-ext
+Architecture: any
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with public CPython extensions
+ example package #2
diff --git a/tests/tpb04/debian/copyright b/tests/tpb04/debian/copyright
new file mode 100644
index 0000000..f96adde
--- /dev/null
+++ b/tests/tpb04/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2013, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/tpb04/debian/rules b/tests/tpb04/debian/rules
new file mode 100755
index 0000000..1a4e00b
--- /dev/null
+++ b/tests/tpb04/debian/rules
@@ -0,0 +1,27 @@
+#!/usr/bin/make -f
+
+export PYBUILD_NAME=foo
+export PYBUILD_EXT_DESTDIR_python3=debian/python3-foo-ext
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	../../pybuild --build
+
+override_dh_auto_install:
+	../../pybuild --install
+
+override_dh_auto_test:
+	../../pybuild --test --test-tox --test-args=-v
+
+override_dh_auto_clean:
+	../../pybuild --clean
+	rm -rf .pybuild .tox foo.egg-info test-executed
+
+override_dh_installinit:
+	DH_VERBOSE=1 ../../dh_python3
+	dh_installinit
+
+override_dh_python3:
+	# ignore any system dh_python3
diff --git a/tests/tpb04/debian/source/format b/tests/tpb04/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/tpb04/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/tpb04/foo.py b/tests/tpb04/foo.py
new file mode 100644
index 0000000..810c96e
--- /dev/null
+++ b/tests/tpb04/foo.py
@@ -0,0 +1 @@
+"foo"
diff --git a/tests/tpb04/setup.cfg b/tests/tpb04/setup.cfg
new file mode 100644
index 0000000..3ff1e35
--- /dev/null
+++ b/tests/tpb04/setup.cfg
@@ -0,0 +1,5 @@
+[metadata]
+name = foo
+
+[options]
+py_modules = foo
diff --git a/tests/tpb04/setup.py b/tests/tpb04/setup.py
new file mode 100644
index 0000000..e922974
--- /dev/null
+++ b/tests/tpb04/setup.py
@@ -0,0 +1,9 @@
+from setuptools import setup, Extension
+
+setup(ext_modules=[
+    Extension(
+        '_foo',
+        ['_foo.c'],
+        py_limited_api = True,
+    )
+])
diff --git a/tests/tpb04/test_foo.py b/tests/tpb04/test_foo.py
new file mode 100644
index 0000000..bbe6954
--- /dev/null
+++ b/tests/tpb04/test_foo.py
@@ -0,0 +1,6 @@
+from unittest import TestCase
+
+
+class RequiredTest(TestCase):
+    def test_tests_are_executed(self):
+        open('test-executed', 'w').close()
diff --git a/tests/tpb04/tox.ini b/tests/tpb04/tox.ini
new file mode 100644
index 0000000..08858b5
--- /dev/null
+++ b/tests/tpb04/tox.ini
@@ -0,0 +1,6 @@
+[tox]
+envlist = py39
+
+[testenv]
+deps = tomli
+commands = python -m unittest discover
diff --git a/tests/tpb05/LICENSE b/tests/tpb05/LICENSE
new file mode 100644
index 0000000..5996299
--- /dev/null
+++ b/tests/tpb05/LICENSE
@@ -0,0 +1,17 @@
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/tests/tpb05/Makefile b/tests/tpb05/Makefile
new file mode 100644
index 0000000..b9bc2a5
--- /dev/null
+++ b/tests/tpb05/Makefile
@@ -0,0 +1,19 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+DI=debian/python3-foo/usr/lib/python3/dist-packages/foo-0.1.dist-info
+
+check:
+	test -f debian/python3-foo/usr/lib/python3/dist-packages/foo/__init__.py
+	grep -q ^foo/__init__.py, $(DI)/RECORD
+	test ! -f $(DI)/direct_url.json
+	grep -L ^foo-0.1.dist-info/direct_url.json, $(DI)/RECORD | grep -q RECORD
+	grep -q 'Depends:.*python3-tomli' debian/python3-foo/DEBIAN/control
+	grep -q 'Depends:.*python3-importlib-metadata \| python3 (>> 3\.5)' debian/python3-foo/DEBIAN/control
+	grep -L 'Depends:.*tox' debian/python3-foo/DEBIAN/control | grep -q control
+	find .pybuild -name test-executed | grep -q test-executed
+	grep -q usr/bin/python3$$ debian/python3-foo/usr/bin/foo
+	find debian/python3-foo/usr/lib/python3/dist-packages/ -name LICENSE | { ! grep -q LICENSE; }
+
+clean:
+	./debian/rules clean
diff --git a/tests/tpb05/debian/changelog b/tests/tpb05/debian/changelog
new file mode 100644
index 0000000..322011c
--- /dev/null
+++ b/tests/tpb05/debian/changelog
@@ -0,0 +1,5 @@
+foo (1.2.3) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ozarowski <piotr@debian.org>  Tue, 02 Jul 2013 11:02:06 +0200
diff --git a/tests/tpb05/debian/control b/tests/tpb05/debian/control
new file mode 100644
index 0000000..76f5dbd
--- /dev/null
+++ b/tests/tpb05/debian/control
@@ -0,0 +1,16 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper-compat (= 12)
+ , python3-all
+ , python3-poetry-core
+ , python3-pytest
+ , pybuild-plugin-pyproject
+Standards-Version: 3.9.4
+
+Package: python3-foo
+Architecture: all
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with public CPython modules
+ example package #1
diff --git a/tests/tpb05/debian/copyright b/tests/tpb05/debian/copyright
new file mode 100644
index 0000000..f96adde
--- /dev/null
+++ b/tests/tpb05/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2013, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/tpb05/debian/rules b/tests/tpb05/debian/rules
new file mode 100755
index 0000000..4923534
--- /dev/null
+++ b/tests/tpb05/debian/rules
@@ -0,0 +1,28 @@
+#!/usr/bin/make -f
+
+export PYBUILD_NAME=foo
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	../../pybuild --build --verbose
+	../../pybuild --build --verbose
+
+override_dh_auto_install:
+	../../pybuild --install
+	../../pybuild --install
+
+override_dh_auto_test:
+	../../pybuild --test --test-pytest
+
+override_dh_auto_clean:
+	../../pybuild --clean --verbose
+	rm -rf .pybuild foo.egg-info
+
+override_dh_installinit:
+	DH_VERBOSE=1 ../../dh_python3
+	dh_installinit
+
+override_dh_python3:
+	# ignore any system dh_python3
diff --git a/tests/tpb05/debian/source/format b/tests/tpb05/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/tpb05/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/tpb05/foo/__init__.py b/tests/tpb05/foo/__init__.py
new file mode 100644
index 0000000..b3b7945
--- /dev/null
+++ b/tests/tpb05/foo/__init__.py
@@ -0,0 +1,4 @@
+"""An amazing sample package!"""
+
+def main():
+    print("Hello")
diff --git a/tests/tpb05/foo/test_foo.py b/tests/tpb05/foo/test_foo.py
new file mode 100644
index 0000000..bbe6954
--- /dev/null
+++ b/tests/tpb05/foo/test_foo.py
@@ -0,0 +1,6 @@
+from unittest import TestCase
+
+
+class RequiredTest(TestCase):
+    def test_tests_are_executed(self):
+        open('test-executed', 'w').close()
diff --git a/tests/tpb05/pyproject.toml b/tests/tpb05/pyproject.toml
new file mode 100644
index 0000000..cb6ebaa
--- /dev/null
+++ b/tests/tpb05/pyproject.toml
@@ -0,0 +1,17 @@
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.poetry]
+name = "foo"
+description = "an example module"
+version = "0.1"
+authors = ["Stefano Rivera <stefanor@debian.org>"]
+license = "Expat"
+
+[tool.poetry.dependencies]
+tomli = "^1.0.0"
+importlib-metadata = { version="*", python = "<3.5" }
+
+[tool.poetry.scripts]
+foo = 'foo:main'
diff --git a/tests/tpb05/setup.py b/tests/tpb05/setup.py
new file mode 100644
index 0000000..6593127
--- /dev/null
+++ b/tests/tpb05/setup.py
@@ -0,0 +1,5 @@
+#!/usr/bin/python3
+import sys
+
+sys.stderr.write('setup.py was called. Use pep517 instead.\n')
+sys.exit(1)
diff --git a/tests/tpb06/LICENSE b/tests/tpb06/LICENSE
new file mode 100644
index 0000000..5996299
--- /dev/null
+++ b/tests/tpb06/LICENSE
@@ -0,0 +1,17 @@
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/tests/tpb06/Makefile b/tests/tpb06/Makefile
new file mode 100644
index 0000000..285fe83
--- /dev/null
+++ b/tests/tpb06/Makefile
@@ -0,0 +1,20 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+DI=debian/python3-foo/usr/lib/python3/dist-packages/foo-0.1.dist-info
+
+check:
+	test -f debian/python3-foo/usr/lib/python3/dist-packages/foo/__init__.py
+	grep -q ^foo/__init__.py, $(DI)/RECORD
+	test ! -f $(DI)/direct_url.json
+	grep -L ^foo-0.1.dist-info/direct_url.json, $(DI)/RECORD | grep -q RECORD
+	grep -q 'Depends:.*python3-tomli' debian/python3-foo/DEBIAN/control
+	grep -q 'Depends:.*python3-importlib-metadata \| python3 (>> 3\.5)' debian/python3-foo/DEBIAN/control
+	grep -L 'Depends:.*tox' debian/python3-foo/DEBIAN/control | grep -q control
+	find .pybuild -name test-executed | grep -q test-executed
+	grep -q usr/bin/python3$$ debian/python3-foo/usr/bin/foo
+	find debian/python3-foo/usr/lib/python3/dist-packages/ -name LICENSE | { ! grep -q LICENSE; }
+	test -f debian/python3-foo/usr/share/man/man1/foo.1.gz
+
+clean:
+	./debian/rules clean
diff --git a/tests/tpb06/debian/changelog b/tests/tpb06/debian/changelog
new file mode 100644
index 0000000..322011c
--- /dev/null
+++ b/tests/tpb06/debian/changelog
@@ -0,0 +1,5 @@
+foo (1.2.3) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ozarowski <piotr@debian.org>  Tue, 02 Jul 2013 11:02:06 +0200
diff --git a/tests/tpb06/debian/control b/tests/tpb06/debian/control
new file mode 100644
index 0000000..dec1e1f
--- /dev/null
+++ b/tests/tpb06/debian/control
@@ -0,0 +1,15 @@
+Source: foo
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper-compat (= 12)
+ , python3-all
+ , python3-setuptools
+ , pybuild-plugin-pyproject
+Standards-Version: 3.9.4
+
+Package: python3-foo
+Architecture: any
+Depends: ${python3:Depends}, ${shlibs:Depends}, ${misc:Depends}
+Description: package with public CPython modules
+ example package #1
diff --git a/tests/tpb06/debian/copyright b/tests/tpb06/debian/copyright
new file mode 100644
index 0000000..f96adde
--- /dev/null
+++ b/tests/tpb06/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2013, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/tpb06/debian/rules b/tests/tpb06/debian/rules
new file mode 100755
index 0000000..db68934
--- /dev/null
+++ b/tests/tpb06/debian/rules
@@ -0,0 +1,26 @@
+#!/usr/bin/make -f
+
+export PYBUILD_NAME=foo
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	../../pybuild --build --verbose
+
+override_dh_auto_install:
+	../../pybuild --install
+
+override_dh_auto_test:
+	../../pybuild --test
+
+override_dh_auto_clean:
+	../../pybuild --clean --verbose
+	rm -rf .pybuild foo.egg-info
+
+override_dh_installinit:
+	DH_VERBOSE=1 ../../dh_python3
+	dh_installinit
+
+override_dh_python3:
+	# ignore any system dh_python3
diff --git a/tests/tpb06/debian/source/format b/tests/tpb06/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/tpb06/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/tpb06/foo/__init__.py b/tests/tpb06/foo/__init__.py
new file mode 100644
index 0000000..b3b7945
--- /dev/null
+++ b/tests/tpb06/foo/__init__.py
@@ -0,0 +1,4 @@
+"""An amazing sample package!"""
+
+def main():
+    print("Hello")
diff --git a/tests/tpb06/foo/ext.c b/tests/tpb06/foo/ext.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/tpb06/foo/ext.c
diff --git a/tests/tpb06/foo/test_foo.py b/tests/tpb06/foo/test_foo.py
new file mode 100644
index 0000000..926af30
--- /dev/null
+++ b/tests/tpb06/foo/test_foo.py
@@ -0,0 +1,13 @@
+import os
+from unittest import TestCase
+import subprocess
+
+
+class RequiredTest(TestCase):
+    def test_tests_are_executed(self):
+        open('test-executed', 'w').close()
+
+    def test_entry_point_executed(self):
+        path, _, __ = os.environ['PATH'].partition(":")
+        assert path.endswith("/scripts")
+        subprocess.run('foo', check=True)
diff --git a/tests/tpb06/man/foo.1 b/tests/tpb06/man/foo.1
new file mode 100644
index 0000000..3bf5dce
--- /dev/null
+++ b/tests/tpb06/man/foo.1
@@ -0,0 +1,8 @@
+.TH foo 1 "December 5 2022"
+.SH NAME
+foo \- An example
+.SH SYNOPSIS
+.B foo
+.SH DESCRIPTION
+.B foo
+says hi.
diff --git a/tests/tpb06/pyproject.toml b/tests/tpb06/pyproject.toml
new file mode 100644
index 0000000..9787c3b
--- /dev/null
+++ b/tests/tpb06/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
diff --git a/tests/tpb06/setup.cfg b/tests/tpb06/setup.cfg
new file mode 100644
index 0000000..fbd051b
--- /dev/null
+++ b/tests/tpb06/setup.cfg
@@ -0,0 +1,21 @@
+[metadata]
+name = foo
+version = 0.1
+description = My package description
+long_description = My long description
+license = Expat
+
+[options]
+zip_safe = False
+packages = find:
+install_requires =
+    tomli
+    importlib-metadata; python_version<'3.5'
+
+[options.entry_points]
+console_scripts =
+    foo = foo:main
+
+[options.data_files]
+share/man/man1 =
+    man/foo.1
diff --git a/tests/tpb06/setup.py b/tests/tpb06/setup.py
new file mode 100644
index 0000000..de0d34b
--- /dev/null
+++ b/tests/tpb06/setup.py
@@ -0,0 +1,12 @@
+from setuptools import setup, Extension
+
+setup_args = dict(
+    ext_modules = [
+        Extension(
+            'foo.ext',
+            ['foo/ext.c'],
+            py_limited_api = True,
+        )
+    ]
+)
+setup(**setup_args)
diff --git a/tests/tpb07/Makefile b/tests/tpb07/Makefile
new file mode 100644
index 0000000..5eb4f00
--- /dev/null
+++ b/tests/tpb07/Makefile
@@ -0,0 +1,11 @@
+#!/usr/bin/make -f
+include ../common.mk
+
+check:
+	test -f debian/python3-foo/usr/lib/python3/dist-packages/foo/__init__.py
+	test -f debian/python3-bar/usr/lib/python3/dist-packages/bar/__init__.py
+	test -f debian/python3-foo/usr/bin/foo
+	test -f debian/python3-bar/usr/bin/bar
+
+clean:
+	./debian/rules clean
diff --git a/tests/tpb07/bar/LICENSE b/tests/tpb07/bar/LICENSE
new file mode 100644
index 0000000..5996299
--- /dev/null
+++ b/tests/tpb07/bar/LICENSE
@@ -0,0 +1,17 @@
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/tests/tpb07/bar/bar/__init__.py b/tests/tpb07/bar/bar/__init__.py
new file mode 100644
index 0000000..717b184
--- /dev/null
+++ b/tests/tpb07/bar/bar/__init__.py
@@ -0,0 +1,4 @@
+"""An amazing sample package!"""
+
+def main():
+    print("Hello I am bar")
diff --git a/tests/tpb07/bar/pyproject.toml b/tests/tpb07/bar/pyproject.toml
new file mode 100644
index 0000000..9787c3b
--- /dev/null
+++ b/tests/tpb07/bar/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
diff --git a/tests/tpb07/bar/setup.cfg b/tests/tpb07/bar/setup.cfg
new file mode 100644
index 0000000..296c419
--- /dev/null
+++ b/tests/tpb07/bar/setup.cfg
@@ -0,0 +1,17 @@
+[metadata]
+name = bar
+version = 0.1
+description = My package description
+long_description = My long description
+license = Expat
+
+[options]
+zip_safe = False
+packages = find:
+install_requires =
+    tomli
+    importlib-metadata; python_version<'3.5'
+
+[options.entry_points]
+console_scripts =
+    bar = bar:main
diff --git a/tests/tpb07/debian/changelog b/tests/tpb07/debian/changelog
new file mode 100644
index 0000000..fa1a4b0
--- /dev/null
+++ b/tests/tpb07/debian/changelog
@@ -0,0 +1,5 @@
+foobar (1.2.3) unstable; urgency=low
+
+  * Initial release
+
+ -- Piotr Ozarowski <piotr@debian.org>  Tue, 02 Jul 2013 11:02:06 +0200
diff --git a/tests/tpb07/debian/control b/tests/tpb07/debian/control
new file mode 100644
index 0000000..6631581
--- /dev/null
+++ b/tests/tpb07/debian/control
@@ -0,0 +1,21 @@
+Source: foobar
+Section: python
+Priority: optional
+Maintainer: Piotr Ożarowski <piotr@debian.org>
+Build-Depends: debhelper-compat (= 12)
+ , python3-all
+ , python3-setuptools
+ , pybuild-plugin-pyproject
+Standards-Version: 3.9.4
+
+Package: python3-foo
+Architecture: all
+Depends: ${python3:Depends}, ${misc:Depends}
+Description: package with public CPython modules
+ example package #1
+
+Package: python3-bar
+Architecture: all
+Depends: ${python3:Depends}, ${misc:Depends}
+Description: package with public CPython modules
+ example package #2
diff --git a/tests/tpb07/debian/copyright b/tests/tpb07/debian/copyright
new file mode 100644
index 0000000..f96adde
--- /dev/null
+++ b/tests/tpb07/debian/copyright
@@ -0,0 +1,2 @@
+The Debian packaging is © 2013, Piotr Ożarowski <piotr@debian.org> and
+is licensed under the MIT License.
diff --git a/tests/tpb07/debian/rules b/tests/tpb07/debian/rules
new file mode 100755
index 0000000..b93abef
--- /dev/null
+++ b/tests/tpb07/debian/rules
@@ -0,0 +1,30 @@
+#!/usr/bin/make -f
+
+export PYBUILD_NAME=foo
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	../../pybuild -d foo --build --verbose --name=foo
+	../../pybuild -d bar --build --verbose --name=bar
+
+override_dh_auto_install:
+	../../pybuild -d foo --install --name=foo
+	../../pybuild -d bar --install --name=bar
+
+override_dh_auto_test:
+	../../pybuild -d foo --test --name=foo
+	../../pybuild -d bar --test --name=bar
+
+override_dh_auto_clean:
+	../../pybuild -d foo --clean --verbose --name=foo
+	../../pybuild -d bar --clean --verbose --name=bar
+	rm -rf .pybuild foo/foo.egg-info bar/bar.egg-info
+
+override_dh_installinit:
+	DH_VERBOSE=1 ../../dh_python3
+	dh_installinit
+
+override_dh_python3:
+	# ignore any system dh_python3
diff --git a/tests/tpb07/debian/source/format b/tests/tpb07/debian/source/format
new file mode 100644
index 0000000..89ae9db
--- /dev/null
+++ b/tests/tpb07/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)
diff --git a/tests/tpb07/foo/LICENSE b/tests/tpb07/foo/LICENSE
new file mode 100644
index 0000000..5996299
--- /dev/null
+++ b/tests/tpb07/foo/LICENSE
@@ -0,0 +1,17 @@
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/tests/tpb07/foo/foo/__init__.py b/tests/tpb07/foo/foo/__init__.py
new file mode 100644
index 0000000..1421a55
--- /dev/null
+++ b/tests/tpb07/foo/foo/__init__.py
@@ -0,0 +1,4 @@
+"""An amazing sample package!"""
+
+def main():
+    print("Hello I am foo")
diff --git a/tests/tpb07/foo/pyproject.toml b/tests/tpb07/foo/pyproject.toml
new file mode 100644
index 0000000..9787c3b
--- /dev/null
+++ b/tests/tpb07/foo/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
diff --git a/tests/tpb07/foo/setup.cfg b/tests/tpb07/foo/setup.cfg
new file mode 100644
index 0000000..3447fdc
--- /dev/null
+++ b/tests/tpb07/foo/setup.cfg
@@ -0,0 +1,17 @@
+[metadata]
+name = foo
+version = 0.1
+description = My package description
+long_description = My long description
+license = Expat
+
+[options]
+zip_safe = False
+packages = find:
+install_requires =
+    tomli
+    importlib-metadata; python_version<'3.5'
+
+[options.entry_points]
+console_scripts =
+    foo = foo:main