Adding upstream version 1.21.22.upstream/1.21.22upstream

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

4 files changed, 993 insertions, 0 deletions

diff --git a/scripts/Dpkg/Vendor/Debian.pm b/scripts/Dpkg/Vendor/Debian.pm
new file mode 100644
index 0000000..06aa49a
--- /dev/null
+++ b/scripts/Dpkg/Vendor/Debian.pm
@@ -0,0 +1,522 @@
+# Copyright © 2009-2011 Raphaël Hertzog <hertzog@debian.org>
+# Copyright © 2009, 2011-2017 Guillem Jover <guillem@debian.org>
+#
+# Hardening build flags handling derived from work of:
+# Copyright © 2009-2011 Kees Cook <kees@debian.org>
+# Copyright © 2007-2008 Canonical, Ltd.
+#
+# 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/>.
+
+package Dpkg::Vendor::Debian;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+
+use Dpkg;
+use Dpkg::Gettext;
+use Dpkg::ErrorHandling;
+use Dpkg::Control::Types;
+
+use parent qw(Dpkg::Vendor::Default);
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::Vendor::Debian - Debian vendor class
+
+=head1 DESCRIPTION
+
+This vendor class customizes the behaviour of dpkg scripts for Debian
+specific behavior and policies.
+
+=cut
+
+sub run_hook {
+    my ($self, $hook, @params) = @_;
+
+    if ($hook eq 'package-keyrings') {
+        return ('/usr/share/keyrings/debian-keyring.gpg',
+                '/usr/share/keyrings/debian-nonupload.gpg',
+                '/usr/share/keyrings/debian-maintainers.gpg');
+    } elsif ($hook eq 'archive-keyrings') {
+        return ('/usr/share/keyrings/debian-archive-keyring.gpg');
+    } elsif ($hook eq 'archive-keyrings-historic') {
+        return ('/usr/share/keyrings/debian-archive-removed-keys.gpg');
+    } elsif ($hook eq 'builtin-build-depends') {
+        return qw(build-essential:native);
+    } elsif ($hook eq 'builtin-build-conflicts') {
+        return ();
+    } elsif ($hook eq 'register-custom-fields') {
+    } elsif ($hook eq 'extend-patch-header') {
+        my ($textref, $ch_info) = @params;
+	if ($ch_info->{'Closes'}) {
+	    foreach my $bug (split(/\s+/, $ch_info->{'Closes'})) {
+		$$textref .= "Bug-Debian: https://bugs.debian.org/$bug\n";
+	    }
+	}
+
+	# XXX: Layer violation...
+	require Dpkg::Vendor::Ubuntu;
+	my $b = Dpkg::Vendor::Ubuntu::find_launchpad_closes($ch_info->{'Changes'});
+	foreach my $bug (@$b) {
+	    $$textref .= "Bug-Ubuntu: https://bugs.launchpad.net/bugs/$bug\n";
+	}
+    } elsif ($hook eq 'update-buildflags') {
+        $self->set_build_features(@params);
+        $self->_add_build_flags(@params);
+    } elsif ($hook eq 'builtin-system-build-paths') {
+        return qw(/build/);
+    } elsif ($hook eq 'build-tainted-by') {
+        return $self->_build_tainted_by();
+    } elsif ($hook eq 'sanitize-environment') {
+        # Reset umask to a sane default.
+        umask 0022;
+        # Reset locale to a sane default.
+        $ENV{LC_COLLATE} = 'C.UTF-8';
+    } elsif ($hook eq 'backport-version-regex') {
+        return qr/~(bpo|deb)/;
+    } else {
+        return $self->SUPER::run_hook($hook, @params);
+    }
+}
+
+sub init_build_features {
+    my ($self, $use_feature, $builtin_feature) = @_;
+}
+
+sub set_build_features {
+    my ($self, $flags) = @_;
+
+    # Default feature states.
+    my %use_feature = (
+        future => {
+            lfs => 0,
+        },
+        qa => {
+            bug => 0,
+            canary => 0,
+        },
+        reproducible => {
+            timeless => 1,
+            fixfilepath => 1,
+            fixdebugpath => 1,
+        },
+        optimize => {
+            lto => 0,
+        },
+        sanitize => {
+            address => 0,
+            thread => 0,
+            leak => 0,
+            undefined => 0,
+        },
+        hardening => {
+            # XXX: This is set to undef so that we can cope with the brokenness
+            # of gcc managing this feature builtin.
+            pie => undef,
+            stackprotector => 1,
+            stackprotectorstrong => 1,
+            fortify => 1,
+            format => 1,
+            relro => 1,
+            bindnow => 0,
+        },
+    );
+
+    my %builtin_feature = (
+        hardening => {
+            pie => 1,
+        },
+    );
+
+    $self->init_build_features(\%use_feature, \%builtin_feature);
+
+    ## Setup
+
+    require Dpkg::BuildOptions;
+
+    # Adjust features based on user or maintainer's desires.
+    my $opts_build = Dpkg::BuildOptions->new(envvar => 'DEB_BUILD_OPTIONS');
+    my $opts_maint = Dpkg::BuildOptions->new(envvar => 'DEB_BUILD_MAINT_OPTIONS');
+
+    foreach my $area (sort keys %use_feature) {
+        $opts_build->parse_features($area, $use_feature{$area});
+        $opts_maint->parse_features($area, $use_feature{$area});
+    }
+
+    require Dpkg::Arch;
+
+    my $arch = Dpkg::Arch::get_host_arch();
+    my ($abi, $libc, $os, $cpu) = Dpkg::Arch::debarch_to_debtuple($arch);
+
+    unless (defined $abi and defined $libc and defined $os and defined $cpu) {
+        warning(g_("unknown host architecture '%s'"), $arch);
+        ($abi, $os, $cpu) = ('', '', '');
+    }
+
+    ## Area: future
+
+    if ($use_feature{future}{lfs}) {
+        my ($abi_bits, $abi_endian) = Dpkg::Arch::debarch_to_abiattrs($arch);
+        my $cpu_bits = Dpkg::Arch::debarch_to_cpubits($arch);
+
+        if ($abi_bits != 32 or $cpu_bits != 32) {
+            $use_feature{future}{lfs} = 0;
+        }
+    }
+
+    ## Area: reproducible
+
+    # Mask features that might have an unsafe usage.
+    if ($use_feature{reproducible}{fixfilepath} or
+        $use_feature{reproducible}{fixdebugpath}) {
+        require Cwd;
+
+        my $build_path =$ENV{DEB_BUILD_PATH} || Cwd::getcwd();
+
+        $flags->set_option_value('build-path', $build_path);
+
+        # If we have any unsafe character in the path, disable the flag,
+        # so that we do not need to worry about escaping the characters
+        # on output.
+        if ($build_path =~ m/[^-+:.0-9a-zA-Z~\/_]/) {
+            $use_feature{reproducible}{fixfilepath} = 0;
+            $use_feature{reproducible}{fixdebugpath} = 0;
+        }
+    }
+
+    ## Area: optimize
+
+    if ($opts_build->has('noopt')) {
+        $flags->set_option_value('optimize-level', 0);
+    } else {
+        $flags->set_option_value('optimize-level', 2);
+    }
+
+    ## Area: sanitize
+
+    # Handle logical feature interactions.
+    if ($use_feature{sanitize}{address} and $use_feature{sanitize}{thread}) {
+        # Disable the thread sanitizer when the address one is active, they
+        # are mutually incompatible.
+        $use_feature{sanitize}{thread} = 0;
+    }
+    if ($use_feature{sanitize}{address} or $use_feature{sanitize}{thread}) {
+        # Disable leak sanitizer, it is implied by the address or thread ones.
+        $use_feature{sanitize}{leak} = 0;
+    }
+
+    ## Area: hardening
+
+    # Mask builtin features that are not enabled by default in the compiler.
+    my %builtin_pie_arch = map { $_ => 1 } qw(
+        amd64
+        arm64
+        armel
+        armhf
+        hurd-i386
+        i386
+        kfreebsd-amd64
+        kfreebsd-i386
+        mips
+        mipsel
+        mips64el
+        powerpc
+        ppc64
+        ppc64el
+        riscv64
+        s390x
+        sparc
+        sparc64
+    );
+    if (not exists $builtin_pie_arch{$arch}) {
+        $builtin_feature{hardening}{pie} = 0;
+    }
+
+    # Mask features that are not available on certain architectures.
+    if ($os !~ /^(?:linux|kfreebsd|knetbsd|hurd)$/ or
+	$cpu =~ /^(?:hppa|avr32)$/) {
+	# Disabled on non-(linux/kfreebsd/knetbsd/hurd).
+	# Disabled on hppa, avr32
+	#  (#574716).
+	$use_feature{hardening}{pie} = 0;
+    }
+    if ($cpu =~ /^(?:ia64|alpha|hppa|nios2)$/ or $arch eq 'arm') {
+	# Stack protector disabled on ia64, alpha, hppa, nios2.
+	#   "warning: -fstack-protector not supported for this target"
+	# Stack protector disabled on arm (ok on armel).
+	#   compiler supports it incorrectly (leads to SEGV)
+	$use_feature{hardening}{stackprotector} = 0;
+    }
+    if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {
+	# relro not implemented on ia64, hppa, avr32.
+	$use_feature{hardening}{relro} = 0;
+    }
+
+    # Mask features that might be influenced by other flags.
+    if ($flags->get_option_value('optimize-level') == 0) {
+      # glibc 2.16 and later warn when using -O0 and _FORTIFY_SOURCE.
+      $use_feature{hardening}{fortify} = 0;
+    }
+
+    # Handle logical feature interactions.
+    if ($use_feature{hardening}{relro} == 0) {
+	# Disable bindnow if relro is not enabled, since it has no
+	# hardening ability without relro and may incur load penalties.
+	$use_feature{hardening}{bindnow} = 0;
+    }
+    if ($use_feature{hardening}{stackprotector} == 0) {
+	# Disable stackprotectorstrong if stackprotector is disabled.
+	$use_feature{hardening}{stackprotectorstrong} = 0;
+    }
+
+    ## Commit
+
+    # Set used features to their builtin setting if unset.
+    foreach my $area (sort keys %builtin_feature) {
+        while (my ($feature, $enabled) = each %{$builtin_feature{$area}}) {
+            $flags->set_builtin($area, $feature, $enabled);
+        }
+    }
+
+    # Store the feature usage.
+    foreach my $area (sort keys %use_feature) {
+        while (my ($feature, $enabled) = each %{$use_feature{$area}}) {
+            $flags->set_feature($area, $feature, $enabled);
+        }
+    }
+}
+
+sub _add_build_flags {
+    my ($self, $flags) = @_;
+
+    ## Global default flags
+
+    my @compile_flags = qw(
+        CFLAGS
+        CXXFLAGS
+        OBJCFLAGS
+        OBJCXXFLAGS
+        FFLAGS
+        FCFLAGS
+        GCJFLAGS
+    );
+
+    my $default_flags;
+    my $default_d_flags;
+
+    my $optimize_level = $flags->get_option_value('optimize-level');
+    $default_flags = "-g -O$optimize_level";
+    if ($optimize_level == 0) {
+        $default_d_flags = '-fdebug';
+    } else {
+        $default_d_flags = '-frelease';
+    }
+
+    $flags->append($_, $default_flags) foreach @compile_flags;
+    $flags->append('DFLAGS', $default_d_flags);
+
+    ## Area: future
+
+    if ($flags->use_feature('future', 'lfs')) {
+        $flags->append('CPPFLAGS',
+                       '-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64');
+    }
+
+    ## Area: qa
+
+    # Warnings that detect actual bugs.
+    if ($flags->use_feature('qa', 'bug')) {
+        # C flags
+        my @cflags = qw(
+            implicit-function-declaration
+        );
+        foreach my $warnflag (@cflags) {
+            $flags->append('CFLAGS', "-Werror=$warnflag");
+        }
+
+        # C/C++ flags
+        my @cfamilyflags = qw(
+            array-bounds
+            clobbered
+            volatile-register-var
+        );
+        foreach my $warnflag (@cfamilyflags) {
+            $flags->append('CFLAGS', "-Werror=$warnflag");
+            $flags->append('CXXFLAGS', "-Werror=$warnflag");
+        }
+    }
+
+    # Inject dummy canary options to detect issues with build flag propagation.
+    if ($flags->use_feature('qa', 'canary')) {
+        require Digest::MD5;
+        my $id = Digest::MD5::md5_hex(int rand 4096);
+
+        foreach my $flag (qw(CPPFLAGS CFLAGS OBJCFLAGS CXXFLAGS OBJCXXFLAGS)) {
+            $flags->append($flag, "-D__DEB_CANARY_${flag}_${id}__");
+        }
+        $flags->append('LDFLAGS', "-Wl,-z,deb-canary-${id}");
+    }
+
+    ## Area: reproducible
+
+    # Warn when the __TIME__, __DATE__ and __TIMESTAMP__ macros are used.
+    if ($flags->use_feature('reproducible', 'timeless')) {
+       $flags->append('CPPFLAGS', '-Wdate-time');
+    }
+
+    # Avoid storing the build path in the binaries.
+    if ($flags->use_feature('reproducible', 'fixfilepath') or
+        $flags->use_feature('reproducible', 'fixdebugpath')) {
+        my $build_path = $flags->get_option_value('build-path');
+        my $map;
+
+        # -ffile-prefix-map is a superset of -fdebug-prefix-map, prefer it
+        # if both are set.
+        if ($flags->use_feature('reproducible', 'fixfilepath')) {
+            $map = '-ffile-prefix-map=' . $build_path . '=.';
+        } else {
+            $map = '-fdebug-prefix-map=' . $build_path . '=.';
+        }
+
+        $flags->append($_, $map) foreach @compile_flags;
+    }
+
+    ## Area: optimize
+
+    if ($flags->use_feature('optimize', 'lto')) {
+        my $flag = '-flto=auto -ffat-lto-objects';
+        $flags->append($_, $flag) foreach (@compile_flags, 'LDFLAGS');
+    }
+
+    ## Area: sanitize
+
+    if ($flags->use_feature('sanitize', 'address')) {
+        my $flag = '-fsanitize=address -fno-omit-frame-pointer';
+        $flags->append('CFLAGS', $flag);
+        $flags->append('CXXFLAGS', $flag);
+        $flags->append('LDFLAGS', '-fsanitize=address');
+    }
+
+    if ($flags->use_feature('sanitize', 'thread')) {
+        my $flag = '-fsanitize=thread';
+        $flags->append('CFLAGS', $flag);
+        $flags->append('CXXFLAGS', $flag);
+        $flags->append('LDFLAGS', $flag);
+    }
+
+    if ($flags->use_feature('sanitize', 'leak')) {
+        $flags->append('LDFLAGS', '-fsanitize=leak');
+    }
+
+    if ($flags->use_feature('sanitize', 'undefined')) {
+        my $flag = '-fsanitize=undefined';
+        $flags->append('CFLAGS', $flag);
+        $flags->append('CXXFLAGS', $flag);
+        $flags->append('LDFLAGS', $flag);
+    }
+
+    ## Area: hardening
+
+    # PIE
+    my $use_pie = $flags->get_feature('hardening', 'pie');
+    my %hardening_builtins = $flags->get_builtins('hardening');
+    if (defined $use_pie && $use_pie && ! $hardening_builtins{pie}) {
+	my $flag = "-specs=$Dpkg::DATADIR/pie-compile.specs";
+        $flags->append($_, $flag) foreach @compile_flags;
+	$flags->append('LDFLAGS', "-specs=$Dpkg::DATADIR/pie-link.specs");
+    } elsif (defined $use_pie && ! $use_pie && $hardening_builtins{pie}) {
+	my $flag = "-specs=$Dpkg::DATADIR/no-pie-compile.specs";
+        $flags->append($_, $flag) foreach @compile_flags;
+	$flags->append('LDFLAGS', "-specs=$Dpkg::DATADIR/no-pie-link.specs");
+    }
+
+    # Stack protector
+    if ($flags->use_feature('hardening', 'stackprotectorstrong')) {
+	my $flag = '-fstack-protector-strong';
+        $flags->append($_, $flag) foreach @compile_flags;
+    } elsif ($flags->use_feature('hardening', 'stackprotector')) {
+	my $flag = '-fstack-protector --param=ssp-buffer-size=4';
+        $flags->append($_, $flag) foreach @compile_flags;
+    }
+
+    # Fortify Source
+    if ($flags->use_feature('hardening', 'fortify')) {
+	$flags->append('CPPFLAGS', '-D_FORTIFY_SOURCE=2');
+    }
+
+    # Format Security
+    if ($flags->use_feature('hardening', 'format')) {
+	my $flag = '-Wformat -Werror=format-security';
+	$flags->append('CFLAGS', $flag);
+	$flags->append('CXXFLAGS', $flag);
+	$flags->append('OBJCFLAGS', $flag);
+	$flags->append('OBJCXXFLAGS', $flag);
+    }
+
+    # Read-only Relocations
+    if ($flags->use_feature('hardening', 'relro')) {
+	$flags->append('LDFLAGS', '-Wl,-z,relro');
+    }
+
+    # Bindnow
+    if ($flags->use_feature('hardening', 'bindnow')) {
+	$flags->append('LDFLAGS', '-Wl,-z,now');
+    }
+}
+
+sub _build_tainted_by {
+    my $self = shift;
+    my %tainted;
+
+    foreach my $pathname (qw(/bin /sbin /lib /lib32 /libo32 /libx32 /lib64)) {
+        next unless -l $pathname;
+
+        my $linkname = readlink $pathname;
+        if ($linkname eq "usr$pathname" or $linkname eq "/usr$pathname") {
+            $tainted{'merged-usr-via-aliased-dirs'} = 1;
+            last;
+        }
+    }
+
+    require File::Find;
+    my %usr_local_types = (
+        configs => [ qw(etc) ],
+        includes => [ qw(include) ],
+        programs => [ qw(bin sbin) ],
+        libraries => [ qw(lib) ],
+    );
+    foreach my $type (keys %usr_local_types) {
+        File::Find::find({
+            wanted => sub { $tainted{"usr-local-has-$type"} = 1 if -f },
+            no_chdir => 1,
+        }, grep { -d } map { "/usr/local/$_" } @{$usr_local_types{$type}});
+    }
+
+    my @tainted = sort keys %tainted;
+    return @tainted;
+}
+
+=head1 CHANGES
+
+=head2 Version 0.xx
+
+This is a private module.
+
+=cut
+
+1;
diff --git a/scripts/Dpkg/Vendor/Default.pm b/scripts/Dpkg/Vendor/Default.pm
new file mode 100644
index 0000000..8362b5b
--- /dev/null
+++ b/scripts/Dpkg/Vendor/Default.pm
@@ -0,0 +1,229 @@
+# Copyright © 2009 Raphaël Hertzog <hertzog@debian.org>
+#
+# 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/>.
+
+package Dpkg::Vendor::Default;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+
+# If you use this file as template to create a new vendor class, please
+# uncomment the following lines
+#use parent qw(Dpkg::Vendor::Default);
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::Vendor::Default - default vendor class
+
+=head1 DESCRIPTION
+
+A vendor class is used to provide vendor specific behaviour
+in various places. This is the default class used in case
+there's none for the current vendor or in case the vendor could
+not be identified (see Dpkg::Vendor documentation).
+
+It provides some hooks that are called by various dpkg-* tools.
+If you need a new hook, please file a bug against dpkg-dev and explain
+your need. Note that the hook API has no guarantee to be stable over an
+extended period of time. If you run an important distribution that makes
+use of vendor hooks, you'd better submit them for integration so that
+we avoid breaking your code.
+
+=head1 METHODS
+
+=over 4
+
+=item $vendor_obj = Dpkg::Vendor::Default->new()
+
+Creates the default vendor object. Can be inherited by all vendor objects
+if they don't need any specific initialization at object creation time.
+
+=cut
+
+sub new {
+    my $this = shift;
+    my $class = ref($this) || $this;
+    my $self = {};
+    bless $self, $class;
+    return $self;
+}
+
+=item $vendor_obj->run_hook($id, @params)
+
+Run the corresponding hook. The parameters are hook-specific. The
+supported hooks are:
+
+=over 8
+
+=item before-source-build ($srcpkg)
+
+The first parameter is a Dpkg::Source::Package object. The hook is called
+just before the execution of $srcpkg->build().
+
+=item package-keyrings ()
+
+The hook is called when dpkg-source is checking a signature on a source
+package (since dpkg 1.18.11). It takes no parameters, but returns a
+(possibly empty) list of vendor-specific keyrings.
+
+=item archive-keyrings ()
+
+The hook is called when there is a need to check signatures on artifacts
+from repositories, for example by a download method (since dpkg 1.18.11).
+It takes no parameters, but returns a (possibly empty) list of
+vendor-specific keyrings.
+
+=item archive-keyrings-historic ()
+
+The hook is called when there is a need to check signatures on artifacts
+from historic repositories, for example by a download method
+(since dpkg 1.18.11). It takes no parameters, but returns a (possibly empty)
+list of vendor-specific keyrings.
+
+=item builtin-build-depends ()
+
+The hook is called when dpkg-checkbuilddeps is initializing the source
+package build dependencies (since dpkg 1.18.2). It takes no parameters,
+but returns a (possibly empty) list of vendor-specific B<Build-Depends>.
+
+=item builtin-build-conflicts ()
+
+The hook is called when dpkg-checkbuilddeps is initializing the source
+package build conflicts (since dpkg 1.18.2). It takes no parameters,
+but returns a (possibly empty) list of vendor-specific B<Build-Conflicts>.
+
+=item register-custom-fields ()
+
+The hook is called in Dpkg::Control::Fields to register custom fields.
+You should return a list of arrays. Each array is an operation to perform.
+The first item is the name of the operation and corresponds
+to a field_* function provided by Dpkg::Control::Fields. The remaining
+fields are the parameters that are passed unchanged to the corresponding
+function.
+
+Known operations are "register", "insert_after" and "insert_before".
+
+=item post-process-changelog-entry ($fields)
+
+The hook is called in Dpkg::Changelog to post-process a
+Dpkg::Changelog::Entry after it has been created and filled with the
+appropriate values.
+
+=item update-buildflags ($flags)
+
+The hook is called in Dpkg::BuildFlags to allow the vendor to override
+the default values set for the various build flags. $flags is a
+Dpkg::BuildFlags object.
+
+=item builtin-system-build-paths ()
+
+The hook is called by dpkg-genbuildinfo to determine if the current path
+should be recorded in the B<Build-Path> field (since dpkg 1.18.11). It takes
+no parameters, but returns a (possibly empty) list of root paths considered
+acceptable. As an example, if the list contains "/build/", a Build-Path
+field will be created if the current directory is "/build/dpkg-1.18.0". If
+the list contains "/", the path will always be recorded. If the list is
+empty, the current path will never be recorded.
+
+=item build-tainted-by ()
+
+The hook is called by dpkg-genbuildinfo to determine if the current system
+has been tainted in some way that could affect the resulting build, which
+will be recorded in the B<Build-Tainted-By> field (since dpkg 1.19.5). It
+takes no parameters, but returns a (possibly empty) list of tainted reason
+tags (formed by alphanumeric and dash characters).
+
+=item sanitize-environment ()
+
+The hook is called by dpkg-buildpackage to sanitize its build environment
+(since dpkg 1.20.0).
+
+=item backport-version-regex ()
+
+The hook is called by dpkg-genchanges and dpkg-mergechangelog to determine
+the backport version string that should be specially handled as not an earlier
+than version or remapped so that it does not get considered as a pre-release
+(since dpkg 1.21.3).
+The returned string is a regex with one capture group for the backport
+delimiter string, or undef if there is no regex.
+
+=back
+
+=cut
+
+sub run_hook {
+    my ($self, $hook, @params) = @_;
+
+    if ($hook eq 'before-source-build') {
+        my $srcpkg = shift @params;
+    } elsif ($hook eq 'package-keyrings') {
+        return ();
+    } elsif ($hook eq 'archive-keyrings') {
+        return ();
+    } elsif ($hook eq 'archive-keyrings-historic') {
+        return ();
+    } elsif ($hook eq 'register-custom-fields') {
+        return ();
+    } elsif ($hook eq 'builtin-build-depends') {
+        return ();
+    } elsif ($hook eq 'builtin-build-conflicts') {
+        return ();
+    } elsif ($hook eq 'post-process-changelog-entry') {
+        my $fields = shift @params;
+    } elsif ($hook eq 'extend-patch-header') {
+	my ($textref, $ch_info) = @params;
+    } elsif ($hook eq 'update-buildflags') {
+	my $flags = shift @params;
+    } elsif ($hook eq 'builtin-system-build-paths') {
+        return ();
+    } elsif ($hook eq 'build-tainted-by') {
+        return ();
+    } elsif ($hook eq 'sanitize-environment') {
+        return;
+    } elsif ($hook eq 'backport-version-regex') {
+        return;
+    }
+
+    # Default return value for unknown/unimplemented hooks
+    return;
+}
+
+=item $vendor->set_build_features($flags)
+
+Sets the vendor build features, which will then be used to initialize the
+build flags.
+
+=cut
+
+sub set_build_features {
+    my ($self, $flags) = @_;
+
+    return;
+}
+
+=back
+
+=head1 CHANGES
+
+=head2 Version 0.xx
+
+This is a private module.
+
+=cut
+
+1;
diff --git a/scripts/Dpkg/Vendor/Devuan.pm b/scripts/Dpkg/Vendor/Devuan.pm
new file mode 100644
index 0000000..661dc9e
--- /dev/null
+++ b/scripts/Dpkg/Vendor/Devuan.pm
@@ -0,0 +1,68 @@
+# Copyright © 2022 Guillem Jover <guillem@debian.org>
+#
+# 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/>.
+
+package Dpkg::Vendor::Devuan;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+
+use parent qw(Dpkg::Vendor::Debian);
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::Vendor::Devuan - Devuan vendor class
+
+=head1 DESCRIPTION
+
+This vendor class customizes the behaviour of dpkg scripts for Devuan
+specific behavior and policies.
+
+=cut
+
+sub run_hook {
+    my ($self, $hook, @params) = @_;
+
+    if ($hook eq 'package-keyrings') {
+        return ('/usr/share/keyrings/devuan-keyring.gpg',
+                '/usr/share/keyrings/devuan-maintainers.gpg');
+    } elsif ($hook eq 'archive-keyrings') {
+        return ('/usr/share/keyrings/devuan-archive-keyring.gpg');
+    } elsif ($hook eq 'archive-keyrings-historic') {
+        return ('/usr/share/keyrings/devuan-archive-removed-keys.gpg');
+    } elsif ($hook eq 'extend-patch-header') {
+        my ($textref, $ch_info) = @params;
+        if ($ch_info->{'Closes'}) {
+            foreach my $bug (split(/\s+/, $ch_info->{'Closes'})) {
+                $$textref .= "Bug-Devuan: https://bugs.devuan.org/$bug\n";
+            }
+        }
+    } else {
+        return $self->SUPER::run_hook($hook, @params);
+    }
+}
+
+=head1 CHANGES
+
+=head2 Version 0.xx
+
+This is a private module.
+
+=cut
+
+1;
diff --git a/scripts/Dpkg/Vendor/Ubuntu.pm b/scripts/Dpkg/Vendor/Ubuntu.pm
new file mode 100644
index 0000000..9c77519
--- /dev/null
+++ b/scripts/Dpkg/Vendor/Ubuntu.pm
@@ -0,0 +1,174 @@
+# Copyright © 2008 Ian Jackson <ijackson@chiark.greenend.org.uk>
+# Copyright © 2008 Canonical, Ltd.
+#   written by Colin Watson <cjwatson@ubuntu.com>
+# Copyright © 2008 James Westby <jw+debian@jameswestby.net>
+# Copyright © 2009 Raphaël Hertzog <hertzog@debian.org>
+#
+# 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/>.
+
+package Dpkg::Vendor::Ubuntu;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+
+use List::Util qw(any);
+
+use Dpkg::ErrorHandling;
+use Dpkg::Gettext;
+use Dpkg::Control::Types;
+
+use parent qw(Dpkg::Vendor::Debian);
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::Vendor::Ubuntu - Ubuntu vendor class
+
+=head1 DESCRIPTION
+
+This vendor class customizes the behaviour of dpkg scripts for Ubuntu
+specific behavior and policies.
+
+=cut
+
+sub run_hook {
+    my ($self, $hook, @params) = @_;
+
+    if ($hook eq 'before-source-build') {
+        my $src = shift @params;
+        my $fields = $src->{fields};
+
+        # check that Maintainer/XSBC-Original-Maintainer comply to
+        # https://wiki.ubuntu.com/DebianMaintainerField
+        if (defined($fields->{'Version'}) and defined($fields->{'Maintainer'}) and
+           $fields->{'Version'} =~ /ubuntu/) {
+           if ($fields->{'Maintainer'} !~ /(?:ubuntu|canonical)/i) {
+               if (length $ENV{DEBEMAIL} and $ENV{DEBEMAIL} =~ /\@(?:ubuntu|canonical)\.com/) {
+                   error(g_('Version number suggests Ubuntu changes, but Maintainer: does not have Ubuntu address'));
+               } else {
+                   warning(g_('Version number suggests Ubuntu changes, but Maintainer: does not have Ubuntu address'));
+               }
+           }
+           unless ($fields->{'Original-Maintainer'}) {
+               warning(g_('Version number suggests Ubuntu changes, but there is no XSBC-Original-Maintainer field'));
+           }
+        }
+    } elsif ($hook eq 'package-keyrings') {
+        return ($self->SUPER::run_hook($hook),
+                '/usr/share/keyrings/ubuntu-archive-keyring.gpg');
+    } elsif ($hook eq 'archive-keyrings') {
+        return ($self->SUPER::run_hook($hook),
+                '/usr/share/keyrings/ubuntu-archive-keyring.gpg');
+    } elsif ($hook eq 'archive-keyrings-historic') {
+        return ($self->SUPER::run_hook($hook),
+                '/usr/share/keyrings/ubuntu-archive-removed-keys.gpg');
+    } elsif ($hook eq 'register-custom-fields') {
+        my @field_ops = $self->SUPER::run_hook($hook);
+        push @field_ops, [
+            'register', 'Launchpad-Bugs-Fixed',
+              CTRL_FILE_CHANGES | CTRL_CHANGELOG,
+        ], [
+            'insert_after', CTRL_FILE_CHANGES, 'Closes', 'Launchpad-Bugs-Fixed',
+        ], [
+            'insert_after', CTRL_CHANGELOG, 'Closes', 'Launchpad-Bugs-Fixed',
+        ];
+        return @field_ops;
+    } elsif ($hook eq 'post-process-changelog-entry') {
+        my $fields = shift @params;
+
+        # Add Launchpad-Bugs-Fixed field
+        my $bugs = find_launchpad_closes($fields->{'Changes'} // '');
+        if (scalar(@$bugs)) {
+            $fields->{'Launchpad-Bugs-Fixed'} = join(' ', @$bugs);
+        }
+    } elsif ($hook eq 'update-buildflags') {
+	my $flags = shift @params;
+
+        # Run the Debian hook to add hardening flags
+        $self->SUPER::run_hook($hook, $flags);
+
+	# Per https://wiki.ubuntu.com/DistCompilerFlags
+        $flags->prepend('LDFLAGS', '-Wl,-Bsymbolic-functions');
+    } else {
+        return $self->SUPER::run_hook($hook, @params);
+    }
+}
+
+# Override Debian default features.
+sub init_build_features {
+    my ($self, $use_feature, $builtin_feature) = @_;
+
+    $self->SUPER::init_build_features($use_feature, $builtin_feature);
+
+    require Dpkg::Arch;
+    my $arch = Dpkg::Arch::get_host_arch();
+
+    if (any { $_ eq $arch } qw(amd64 arm64 ppc64el s390x)) {
+        $use_feature->{optimize}{lto} = 1;
+    }
+}
+
+sub set_build_features {
+    my ($self, $flags) = @_;
+
+    $self->SUPER::set_build_features($flags);
+
+    require Dpkg::Arch;
+    my $arch = Dpkg::Arch::get_host_arch();
+
+    if ($arch eq 'ppc64el' && $flags->get_option_value('optimize-level') != 0) {
+        $flags->set_option_value('optimize-level', 3);
+    }
+}
+
+=head1 PUBLIC FUNCTIONS
+
+=over
+
+=item $bugs = Dpkg::Vendor::Ubuntu::find_launchpad_closes($changes)
+
+Takes one string as argument and finds "LP: #123456, #654321" statements,
+which are references to bugs on Launchpad. Returns all closed bug
+numbers in an array reference.
+
+=cut
+
+sub find_launchpad_closes {
+    my $changes = shift;
+    my %closes;
+
+    while ($changes &&
+          ($changes =~ /lp:\s+\#\d+(?:,\s*\#\d+)*/pig)) {
+        $closes{$_} = 1 foreach (${^MATCH} =~ /\#?\s?(\d+)/g);
+    }
+
+    my @closes = sort { $a <=> $b } keys %closes;
+
+    return \@closes;
+}
+
+=back
+
+=head1 CHANGES
+
+=head2 Version 0.xx
+
+This is a semi-private module. Only documented functions are public.
+
+=cut
+
+1;