/usr/share/perl5/BuildDeps.pm is in dh-buildinfo 0.11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This function checks the build dependencies passed in as the first
# parameter. If they are satisfied, returns false. If they are unsatisfied,
# an list of the unsatisfied depends is returned.
#
# Additional parameters that must be passed:
# * A reference to a hash of all "ok installed" the packages on the system,
# with the hash key being the package name, and the value being the
# installed version.
# * A reference to a hash, where the keys are package names, and the
# value is a true value iff some package installed on the system provides
# that package (all installed packages provide themselves)
#
# Optionally, the architecture the package is to be built for can be passed
# in as the 4th parameter. If not set, dpkg will be queried for the build
# architecture.
sub depends {
return check_line(1, @_);
}
# This function is exactly like unmet_build_depends, except it
# checks for build conflicts, and returns a list of the packages
# that are installed and are conflicted with.
sub conflicts {
return check_line(0, @_);
}
# This function does all the work. The first parameter is 1 to check build
# deps, and 0 to check build conflicts.
sub check_line {
my $build_depends=shift;
my $line=shift;
my %version=%{shift()};
my %providers=%{shift()};
my $dump_met=shift();
my $build_arch=shift || `dpkg --print-architecture`;
chomp $build_arch;
my @unmet=();
my @met=();
foreach my $dep (split(/,\s*/, $line)) {
my $ok=0;
my @possibles=();
my @effectives=();
ALTERNATE: foreach my $alternate (split(/\s*\|\s*/, $dep)) {
my ($package, $rest)=split(/\s*(?=[\[\(])/, $alternate, 2);
$package =~ s/\s*$//;
# Check arch specifications.
if (defined $rest && $rest=~m/\[(.*?)\]/) {
my $arches=lc($1);
my $seen_arch='';
foreach my $arch (split(' ', $arches)) {
if ($arch eq $build_arch) {
$seen_arch=1;
next;
}
elsif ($arch eq "!$build_arch") {
next ALTERNATE;
}
elsif ($arch =~ /!/) {
# This is equivilant to
# having seen the current arch,
# unless the current arch
# is also listed..
$seen_arch=1;
}
}
if (! $seen_arch) {
next;
}
}
# This is a possible way to meet the dependency.
# Remove the arch stuff from $alternate.
$alternate=~s/\s+\[.*?\]//;
push @possibles, $alternate;
# Check version.
if (defined $rest && $rest=~m/\(\s*([<>=]{1,2})\s*(.*?)\s*\)/) {
my $relation=$1;
my $version=$2;
if (! exists $version{$package}) {
# Not installed at all, so fail.
next;
}
else {
# Compare installed and needed
# version number.
system("dpkg", "--compare-versions",
$version{$package}, $relation,
$version);
if (($? >> 8) != 0) {
next; # fail
}
}
}
elsif (! defined $providers{$package}) {
# It's not a versioned dependency, and
# nothing provides it, so fail.
next;
}
# If we get to here, the dependency was met.
$ok=1;
if ($dump_met) {
# keep it
# push (@effectives, @{$providers{$package}});
push (@effectives, $package);
}
}
if (@possibles && (($build_depends && ! $ok) ||
(! $build_depends && $ok))) {
# TODO: this could return a more complex
# data structure instead to save re-parsing.
push @unmet, join (" | ", @possibles);
} else {
push @met, @effectives;
}
}
if ($dump_met) {
return @met;
} else {
return @unmet;
}
}
sub pkginfo {
my $package = shift;
my %version=%{shift()};
my %providers=%{shift()};
my @result;
if (ref $package eq 'ARRAY') {
foreach my $pkg (@{$package}) {
push @result, pkginfo ($pkg, \%version, \%providers);
}
} else {
# there is at least one provider, as I assume builddeps are satisfied
foreach my $provider (@{$providers{$package}}) {
my $ver = $version{$provider};
if (defined $ver) {
if ($package eq $provider) {
push (@result, [ $provider, $ver ]);
} else {
# pseudo package
push (@result, [ $provider, $ver, $package ]);
}
}
}
}
return @result;
}
sub parse_control {
my $control=shift || "debian/control";
my %fields = ();
open (CONTROL, $control) || die "$control: $!\n";
local $/='';
my $cdata=<CONTROL>;
close CONTROL;
my $dep_regex=qr/\s*((.|\n\s+)*)\s/; # allow multi-line
if ($cdata =~ /^Build-Depends:$dep_regex/mi) {
$fields{'Build-Depends'} = $1;
}
if ($cdata =~ /^Build-Conflicts:$dep_regex/mi) {
$fields{'Build-Conflicts'} = $1;
}
if (! $binary_only && $cdata =~ /^Build-Depends-Indep:$dep_regex/mi) {
$fields{'Build-Depends-Indep'} = $1;
}
if (! $binary_only && $cdata =~ /^Build-Conflicts-Indep:$dep_regex/mi) {
$fields{'Build-Conflicts-Indep'} = $1;
}
return %fields;
}
1;
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