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+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg - module with core variables
+
+=head1 DESCRIPTION
+
+The Dpkg module provides a set of variables with information concerning
+this system installation.
+
+It is also the entry point to the Dpkg module hierarchy.
+
+=cut
+
+package Dpkg 2.00;
+
+use strict;
+use warnings;
+
+our @EXPORT_OK = qw(
+    $PROGNAME
+    $PROGVERSION
+    $PROGMAKE
+    $PROGTAR
+    $PROGPATCH
+    $CONFDIR
+    $ADMINDIR
+    $LIBDIR
+    $DATADIR
+);
+
+use Exporter qw(import);
+
+=head1 VARIABLES
+
+=over 4
+
+=item $Dpkg::PROGNAME
+
+Contains the name of the current program.
+
+=item $Dpkg::PROGVERSION
+
+Contains the version of the dpkg suite.
+
+=item $Dpkg::PROGMAKE
+
+Contains the name of the system GNU make program.
+
+=item $Dpkg::PROGTAR
+
+Contains the name of the system GNU tar program.
+
+=item $Dpkg::PROGPATCH
+
+Contains the name of the system GNU patch program (or another implementation
+that is directory traversal resistant).
+
+=item $Dpkg::CONFDIR
+
+Contains the path to the dpkg system configuration directory.
+
+=item $Dpkg::ADMINDIR
+
+Contains the path to the dpkg database directory.
+
+=item $Dpkg::LIBDIR
+
+Contains the path to the dpkg methods and plugins directory.
+
+=item $Dpkg::DATADIR
+
+Contains the path to the dpkg architecture tables directory.
+
+=back
+
+=cut
+
+our ($PROGNAME) = $0 =~ m{(?:.*/)?([^/]*)};
+
+# The following lines are automatically fixed at install time
+our $PROGVERSION = '1.22.x';
+our $PROGMAKE = $ENV{DPKG_PROGMAKE} // 'make';
+our $PROGTAR = $ENV{DPKG_PROGTAR} // 'tar';
+our $PROGPATCH = $ENV{DPKG_PROGPATCH} // 'patch';
+
+our $CONFDIR = '/etc/dpkg';
+our $ADMINDIR = '/var/lib/dpkg';
+our $LIBDIR = '.';
+our $DATADIR = '../data';
+
+$DATADIR = $ENV{DPKG_DATADIR} if defined $ENV{DPKG_DATADIR};
+
+=head1 MODULES
+
+The following is the list of public modules within the Dpkg hierarchy. Only
+modules with versions 1.00 or higher, and only the interfaces documented in
+their POD are considered public.
+
+=over
+
+=item L<Dpkg>
+
+This module, core variables.
+
+=item L<Dpkg::Arch>
+
+Architecture handling functions.
+
+=item L<Dpkg::BuildFlags>
+
+Set, modify and query compilation build flags.
+
+=item L<Dpkg::BuildInfo>
+
+Build information functions.
+
+=item L<Dpkg::BuildOptions>
+
+Parse and manipulate B<DEB_BUILD_OPTIONS>.
+
+=item L<Dpkg::BuildProfiles>
+
+Parse and manipulate build profiles.
+
+=item L<Dpkg::Changelog>
+
+Parse changelogs.
+
+=item L<Dpkg::Changelog::Entry>
+
+Represents a changelog entry.
+
+=item L<Dpkg::Changelog::Parse>
+
+Generic changelog parser for F<dpkg-parsechangelog>.
+
+=item L<Dpkg::Checksums>
+
+Generate and parse checksums.
+
+=item L<Dpkg::Compression>
+
+Simple database of available compression methods.
+
+=item L<Dpkg::Compression::FileHandle>
+
+Transparently compress and decompress files.
+
+=item L<Dpkg::Compression::Process>
+
+Wrapper around compression tools.
+
+=item L<Dpkg::Conf>
+
+Parse F<dpkg> configuration files.
+
+=item L<Dpkg::Control>
+
+Parse and manipulate Debian control information (F<.dsc>, F<.changes>,
+F<Packages>/F<Sources> entries, etc.).
+
+=item L<Dpkg::Control::Changelog>
+
+Represent fields output by F<dpkg-parsechangelog>.
+
+=item L<Dpkg::Control::Fields>
+
+Manage (list of known) control fields.
+
+=item L<Dpkg::Control::Hash>
+
+Parse and manipulate a stanza of deb822 fields.
+
+=item L<Dpkg::Control::Info>
+
+Parse files like F<debian/control>.
+
+=item L<Dpkg::Control::Tests>
+
+Parse files like F<debian/tests/control>.
+
+=item L<Dpkg::Control::Tests::Entry>
+
+Represents a F<debian/tests/control> stanza.
+
+=item L<Dpkg::Deps>
+
+Parse and manipulate dependencies.
+
+=item L<Dpkg::Deps::Simple>
+
+Represents a single dependency statement.
+
+=item L<Dpkg::Deps::Multiple>
+
+Base module to represent multiple dependencies.
+
+=item L<Dpkg::Deps::Union>
+
+List of unrelated dependencies.
+
+=item L<Dpkg::Deps::AND>
+
+List of AND dependencies.
+
+=item L<Dpkg::Deps::OR>
+
+List of OR dependencies.
+
+=item L<Dpkg::Deps::KnownFacts>
+
+List of installed and virtual packages.
+
+=item L<Dpkg::Exit>
+
+Push, pop and run exit handlers.
+
+=item L<Dpkg::Gettext>
+
+Wrapper around L<Locale::gettext>.
+
+=item L<Dpkg::IPC>
+
+Spawn sub-processes and feed/retrieve data.
+
+=item L<Dpkg::Index>
+
+Collections of L<Dpkg::Control> (F<Packages>/F<Sources> files for example).
+
+=item L<Dpkg::Interface::Storable>
+
+Base object serializer.
+
+=item L<Dpkg::Path>
+
+Common path handling functions.
+
+=item L<Dpkg::Source::Format>
+
+Parse and manipulate debian/source/format files.
+
+=item L<Dpkg::Source::Package>
+
+Extract Debian source packages.
+
+=item L<Dpkg::Substvars>
+
+Substitute variables in strings.
+
+=item L<Dpkg::Vendor>
+
+Identify current distribution vendor.
+
+=item L<Dpkg::Version>
+
+Parse and manipulate Debian package versions.
+
+=back
+
+=head1 CHANGES
+
+=head2 Version 2.00 (dpkg 1.20.0)
+
+Remove variables: $version, $progname, $admindir, $dpkglibdir and $pkgdatadir.
+
+=head2 Version 1.03 (dpkg 1.18.24)
+
+New variable: $PROGPATCH.
+
+=head2 Version 1.02 (dpkg 1.18.11)
+
+New variable: $PROGTAR, $PROGMAKE.
+
+=head2 Version 1.01 (dpkg 1.17.0)
+
+New variables: $PROGNAME, $PROGVERSION, $CONFDIR, $ADMINDIR, $LIBDIR and
+$DATADIR.
+
+Deprecated variables: $version, $admindir, $dpkglibdir and $pkgdatadir.
+
+=head2 Version 1.00 (dpkg 1.15.6)
+
+Mark the module as public.
+
+=head1 LICENSE
+
+See the header comment on each module for their particular license.
+
+=cut
+
+1;