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-rw-r--r--scripts/Dpkg/BuildFlags.pm612
1 files changed, 612 insertions, 0 deletions
diff --git a/scripts/Dpkg/BuildFlags.pm b/scripts/Dpkg/BuildFlags.pm
new file mode 100644
index 0000000..5975bb0
--- /dev/null
+++ b/scripts/Dpkg/BuildFlags.pm
@@ -0,0 +1,612 @@
+# Copyright © 2010-2011 Raphaël Hertzog <hertzog@debian.org>
+# Copyright © 2012-2022 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::BuildFlags;
+
+use strict;
+use warnings;
+
+our $VERSION = '1.06';
+
+use Dpkg ();
+use Dpkg::Gettext;
+use Dpkg::BuildEnv;
+use Dpkg::ErrorHandling;
+use Dpkg::Vendor qw(run_vendor_hook);
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::BuildFlags - query build flags
+
+=head1 DESCRIPTION
+
+This class is used by dpkg-buildflags and can be used
+to query the same information.
+
+=head1 METHODS
+
+=over 4
+
+=item $bf = Dpkg::BuildFlags->new()
+
+Create a new Dpkg::BuildFlags object. It will be initialized based
+on the value of several configuration files and environment variables.
+
+If the option B<vendor_defaults> is set to false, then no vendor defaults are
+initialized (it defaults to true).
+
+=cut
+
+sub new {
+ my ($this, %opts) = @_;
+ my $class = ref($this) || $this;
+
+ my $self = {
+ };
+ bless $self, $class;
+
+ $opts{vendor_defaults} //= 1;
+
+ if ($opts{vendor_defaults}) {
+ $self->load_vendor_defaults();
+ } else {
+ $self->_init_vendor_defaults();
+ }
+ return $self;
+}
+
+sub _init_vendor_defaults {
+ my $self = shift;
+
+ $self->{features} = {};
+ $self->{builtins} = {};
+ $self->{optvals} = {};
+ $self->{flags} = {
+ ASFLAGS => '',
+ CPPFLAGS => '',
+ CFLAGS => '',
+ CXXFLAGS => '',
+ OBJCFLAGS => '',
+ OBJCXXFLAGS => '',
+ GCJFLAGS => '',
+ DFLAGS => '',
+ FFLAGS => '',
+ FCFLAGS => '',
+ LDFLAGS => '',
+ };
+ $self->{origin} = {
+ ASFLAGS => 'vendor',
+ CPPFLAGS => 'vendor',
+ CFLAGS => 'vendor',
+ CXXFLAGS => 'vendor',
+ OBJCFLAGS => 'vendor',
+ OBJCXXFLAGS => 'vendor',
+ GCJFLAGS => 'vendor',
+ DFLAGS => 'vendor',
+ FFLAGS => 'vendor',
+ FCFLAGS => 'vendor',
+ LDFLAGS => 'vendor',
+ };
+ $self->{maintainer} = {
+ ASFLAGS => 0,
+ CPPFLAGS => 0,
+ CFLAGS => 0,
+ CXXFLAGS => 0,
+ OBJCFLAGS => 0,
+ OBJCXXFLAGS => 0,
+ GCJFLAGS => 0,
+ DFLAGS => 0,
+ FFLAGS => 0,
+ FCFLAGS => 0,
+ LDFLAGS => 0,
+ };
+}
+
+=item $bf->load_vendor_defaults()
+
+Reset the flags stored to the default set provided by the vendor.
+
+=cut
+
+sub load_vendor_defaults {
+ my $self = shift;
+
+ $self->_init_vendor_defaults();
+
+ # The vendor hook will add the feature areas build flags.
+ run_vendor_hook('update-buildflags', $self);
+}
+
+=item $bf->load_system_config()
+
+Update flags from the system configuration.
+
+=cut
+
+sub load_system_config {
+ my $self = shift;
+
+ $self->update_from_conffile("$Dpkg::CONFDIR/buildflags.conf", 'system');
+}
+
+=item $bf->load_user_config()
+
+Update flags from the user configuration.
+
+=cut
+
+sub load_user_config {
+ my $self = shift;
+
+ my $confdir = $ENV{XDG_CONFIG_HOME};
+ $confdir ||= $ENV{HOME} . '/.config' if length $ENV{HOME};
+ if (length $confdir) {
+ $self->update_from_conffile("$confdir/dpkg/buildflags.conf", 'user');
+ }
+}
+
+=item $bf->load_environment_config()
+
+Update flags based on user directives stored in the environment. See
+dpkg-buildflags(1) for details.
+
+=cut
+
+sub load_environment_config {
+ my $self = shift;
+
+ foreach my $flag (keys %{$self->{flags}}) {
+ my $envvar = 'DEB_' . $flag . '_SET';
+ if (Dpkg::BuildEnv::has($envvar)) {
+ $self->set($flag, Dpkg::BuildEnv::get($envvar), 'env');
+ }
+ $envvar = 'DEB_' . $flag . '_STRIP';
+ if (Dpkg::BuildEnv::has($envvar)) {
+ $self->strip($flag, Dpkg::BuildEnv::get($envvar), 'env');
+ }
+ $envvar = 'DEB_' . $flag . '_APPEND';
+ if (Dpkg::BuildEnv::has($envvar)) {
+ $self->append($flag, Dpkg::BuildEnv::get($envvar), 'env');
+ }
+ $envvar = 'DEB_' . $flag . '_PREPEND';
+ if (Dpkg::BuildEnv::has($envvar)) {
+ $self->prepend($flag, Dpkg::BuildEnv::get($envvar), 'env');
+ }
+ }
+}
+
+=item $bf->load_maintainer_config()
+
+Update flags based on maintainer directives stored in the environment. See
+dpkg-buildflags(1) for details.
+
+=cut
+
+sub load_maintainer_config {
+ my $self = shift;
+
+ foreach my $flag (keys %{$self->{flags}}) {
+ my $envvar = 'DEB_' . $flag . '_MAINT_SET';
+ if (Dpkg::BuildEnv::has($envvar)) {
+ $self->set($flag, Dpkg::BuildEnv::get($envvar), undef, 1);
+ }
+ $envvar = 'DEB_' . $flag . '_MAINT_STRIP';
+ if (Dpkg::BuildEnv::has($envvar)) {
+ $self->strip($flag, Dpkg::BuildEnv::get($envvar), undef, 1);
+ }
+ $envvar = 'DEB_' . $flag . '_MAINT_APPEND';
+ if (Dpkg::BuildEnv::has($envvar)) {
+ $self->append($flag, Dpkg::BuildEnv::get($envvar), undef, 1);
+ }
+ $envvar = 'DEB_' . $flag . '_MAINT_PREPEND';
+ if (Dpkg::BuildEnv::has($envvar)) {
+ $self->prepend($flag, Dpkg::BuildEnv::get($envvar), undef, 1);
+ }
+ }
+}
+
+
+=item $bf->load_config()
+
+Call successively load_system_config(), load_user_config(),
+load_environment_config() and load_maintainer_config() to update the
+default build flags defined by the vendor.
+
+=cut
+
+sub load_config {
+ my $self = shift;
+
+ $self->load_system_config();
+ $self->load_user_config();
+ $self->load_environment_config();
+ $self->load_maintainer_config();
+}
+
+=item $bf->unset($flag)
+
+Unset the build flag $flag, so that it will not be known anymore.
+
+=cut
+
+sub unset {
+ my ($self, $flag) = @_;
+
+ delete $self->{flags}->{$flag};
+ delete $self->{origin}->{$flag};
+ delete $self->{maintainer}->{$flag};
+}
+
+=item $bf->set($flag, $value, $source, $maint)
+
+Update the build flag $flag with value $value and record its origin as
+$source (if defined). Record it as maintainer modified if $maint is
+defined and true.
+
+=cut
+
+sub set {
+ my ($self, $flag, $value, $src, $maint) = @_;
+ $self->{flags}->{$flag} = $value;
+ $self->{origin}->{$flag} = $src if defined $src;
+ $self->{maintainer}->{$flag} = $maint if $maint;
+}
+
+=item $bf->set_feature($area, $feature, $enabled)
+
+Update the boolean state of whether a specific feature within a known
+feature area has been enabled. The only currently known feature areas
+are "future", "qa", "sanitize", "optimize", "hardening" and "reproducible".
+
+=cut
+
+sub set_feature {
+ my ($self, $area, $feature, $enabled) = @_;
+ $self->{features}{$area}{$feature} = $enabled;
+}
+
+=item $bf->get_feature($area, $feature)
+
+Returns the value for the given feature within a known feature area.
+This is relevant for builtin features where the feature has a ternary
+state of true, false and undef, and where the latter cannot be retrieved
+with use_feature().
+
+=cut
+
+sub get_feature {
+ my ($self, $area, $feature) = @_;
+
+ return if ! $self->has_features($area);
+ return $self->{features}{$area}{$feature};
+}
+
+=item $bf->use_feature($area, $feature)
+
+Returns true if the given feature within a known feature areas has been
+enabled, and false otherwise.
+The only currently recognized feature areas are "future", "qa", "sanitize",
+"optimize", "hardening" and "reproducible".
+
+=cut
+
+sub use_feature {
+ my ($self, $area, $feature) = @_;
+
+ return 0 if ! $self->has_features($area);
+ return 0 if ! $self->{features}{$area}{$feature};
+ return 1;
+}
+
+=item $bf->set_builtin($area, $feature, $enabled)
+
+Update the boolean state of whether a specific feature within a known
+feature area is handled (even if only in some architectures) as a builtin
+default by the compiler.
+
+=cut
+
+sub set_builtin {
+ my ($self, $area, $feature, $enabled) = @_;
+ $self->{builtins}{$area}{$feature} = $enabled;
+}
+
+=item $bf->get_builtins($area)
+
+Return, for the given area, a hash with keys as feature names, and values
+as booleans indicating whether the feature is handled as a builtin default
+by the compiler or not. Only features that might be handled as builtins on
+some architectures are returned as part of the hash. Missing features mean
+they are currently never handled as builtins by the compiler.
+
+=cut
+
+sub get_builtins {
+ my ($self, $area) = @_;
+ return if ! exists $self->{builtins}{$area};
+ return %{$self->{builtins}{$area}};
+}
+
+=item $bf->set_option_value($option, $value)
+
+B<Private> method to set the value of a build option.
+Do not use outside of the dpkg project.
+
+=cut
+
+sub set_option_value {
+ my ($self, $option, $value) = @_;
+
+ $self->{optvals}{$option} = $value;
+}
+
+=item $bf->get_option_value($option)
+
+B<Private> method to get the value of a build option.
+Do not use outside of the dpkg project.
+
+=cut
+
+sub get_option_value {
+ my ($self, $option) = @_;
+
+ return $self->{optvals}{$option};
+}
+
+=item $bf->strip($flag, $value, $source, $maint)
+
+Update the build flag $flag by stripping the flags listed in $value and
+record its origin as $source (if defined). Record it as maintainer modified
+if $maint is defined and true.
+
+=cut
+
+sub strip {
+ my ($self, $flag, $value, $src, $maint) = @_;
+
+ my %strip = map { $_ => 1 } split /\s+/, $value;
+
+ $self->{flags}->{$flag} = join q{ }, grep {
+ ! exists $strip{$_}
+ } split q{ }, $self->{flags}{$flag};
+ $self->{origin}->{$flag} = $src if defined $src;
+ $self->{maintainer}->{$flag} = $maint if $maint;
+}
+
+=item $bf->append($flag, $value, $source, $maint)
+
+Append the options listed in $value to the current value of the flag $flag.
+Record its origin as $source (if defined). Record it as maintainer modified
+if $maint is defined and true.
+
+=cut
+
+sub append {
+ my ($self, $flag, $value, $src, $maint) = @_;
+ if (length($self->{flags}->{$flag})) {
+ $self->{flags}->{$flag} .= " $value";
+ } else {
+ $self->{flags}->{$flag} = $value;
+ }
+ $self->{origin}->{$flag} = $src if defined $src;
+ $self->{maintainer}->{$flag} = $maint if $maint;
+}
+
+=item $bf->prepend($flag, $value, $source, $maint)
+
+Prepend the options listed in $value to the current value of the flag $flag.
+Record its origin as $source (if defined). Record it as maintainer modified
+if $maint is defined and true.
+
+=cut
+
+sub prepend {
+ my ($self, $flag, $value, $src, $maint) = @_;
+ if (length($self->{flags}->{$flag})) {
+ $self->{flags}->{$flag} = "$value " . $self->{flags}->{$flag};
+ } else {
+ $self->{flags}->{$flag} = $value;
+ }
+ $self->{origin}->{$flag} = $src if defined $src;
+ $self->{maintainer}->{$flag} = $maint if $maint;
+}
+
+
+=item $bf->update_from_conffile($file, $source)
+
+Update the current build flags based on the configuration directives
+contained in $file. See dpkg-buildflags(1) for the format of the directives.
+
+$source is the origin recorded for any build flag set or modified.
+
+=cut
+
+sub update_from_conffile {
+ my ($self, $file, $src) = @_;
+ local $_;
+
+ return unless -e $file;
+ open(my $conf_fh, '<', $file) or syserr(g_('cannot read %s'), $file);
+ while (<$conf_fh>) {
+ chomp;
+ next if /^\s*#/; # Skip comments
+ next if /^\s*$/; # Skip empty lines
+ if (/^(append|prepend|set|strip)\s+(\S+)\s+(\S.*\S)\s*$/i) {
+ my ($op, $flag, $value) = ($1, $2, $3);
+ unless (exists $self->{flags}->{$flag}) {
+ warning(g_('line %d of %s mentions unknown flag %s'), $., $file, $flag);
+ $self->{flags}->{$flag} = '';
+ }
+ if (lc($op) eq 'set') {
+ $self->set($flag, $value, $src);
+ } elsif (lc($op) eq 'strip') {
+ $self->strip($flag, $value, $src);
+ } elsif (lc($op) eq 'append') {
+ $self->append($flag, $value, $src);
+ } elsif (lc($op) eq 'prepend') {
+ $self->prepend($flag, $value, $src);
+ }
+ } else {
+ warning(g_('line %d of %s is invalid, it has been ignored'), $., $file);
+ }
+ }
+ close($conf_fh);
+}
+
+=item $bf->get($flag)
+
+Return the value associated to the flag. It might be undef if the
+flag doesn't exist.
+
+=cut
+
+sub get {
+ my ($self, $key) = @_;
+ return $self->{flags}{$key};
+}
+
+=item $bf->get_feature_areas()
+
+Return the feature areas (i.e. the area values has_features will return
+true for).
+
+=cut
+
+sub get_feature_areas {
+ my $self = shift;
+
+ return keys %{$self->{features}};
+}
+
+=item $bf->get_features($area)
+
+Return, for the given area, a hash with keys as feature names, and values
+as booleans indicating whether the feature is enabled or not.
+
+=cut
+
+sub get_features {
+ my ($self, $area) = @_;
+ return %{$self->{features}{$area}};
+}
+
+=item $bf->get_origin($flag)
+
+Return the origin associated to the flag. It might be undef if the
+flag doesn't exist.
+
+=cut
+
+sub get_origin {
+ my ($self, $key) = @_;
+ return $self->{origin}{$key};
+}
+
+=item $bf->is_maintainer_modified($flag)
+
+Return true if the flag is modified by the maintainer.
+
+=cut
+
+sub is_maintainer_modified {
+ my ($self, $key) = @_;
+ return $self->{maintainer}{$key};
+}
+
+=item $bf->has_features($area)
+
+Returns true if the given area of features is known, and false otherwise.
+The only currently recognized feature areas are "future", "qa", "sanitize",
+"optimize", "hardening" and "reproducible".
+
+=cut
+
+sub has_features {
+ my ($self, $area) = @_;
+ return exists $self->{features}{$area};
+}
+
+=item $bf->has($option)
+
+Returns a boolean indicating whether the flags exists in the object.
+
+=cut
+
+sub has {
+ my ($self, $key) = @_;
+ return exists $self->{flags}{$key};
+}
+
+=item @flags = $bf->list()
+
+Returns the list of flags stored in the object.
+
+=cut
+
+sub list {
+ my $self = shift;
+ my @list = sort keys %{$self->{flags}};
+ return @list;
+}
+
+=back
+
+=head1 CHANGES
+
+=head2 Version 1.06 (dpkg 1.21.15)
+
+New method: $bf->get_feature().
+
+=head2 Version 1.05 (dpkg 1.21.14)
+
+New option: 'vendor_defaults' in new().
+
+New methods: $bf->load_vendor_defaults(), $bf->use_feature(),
+$bf->set_builtin(), $bf->get_builtins().
+
+=head2 Version 1.04 (dpkg 1.20.0)
+
+New method: $bf->unset().
+
+=head2 Version 1.03 (dpkg 1.16.5)
+
+New method: $bf->get_feature_areas() to list possible values for
+$bf->get_features.
+
+New method $bf->is_maintainer_modified() and new optional parameter to
+$bf->set(), $bf->append(), $bf->prepend(), $bf->strip().
+
+=head2 Version 1.02 (dpkg 1.16.2)
+
+New methods: $bf->get_features(), $bf->has_features(), $bf->set_feature().
+
+=head2 Version 1.01 (dpkg 1.16.1)
+
+New method: $bf->prepend() very similar to append(). Implement support of
+the prepend operation everywhere.
+
+New method: $bf->load_maintainer_config() that update the build flags
+based on the package maintainer directives.
+
+=head2 Version 1.00 (dpkg 1.15.7)
+
+Mark the module as public.
+
+=cut
+
+1;
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