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Current File : /bin/dh_md5sums

#!/usr/bin/perl

=head1 NAME

dh_md5sums - generate DEBIAN/md5sums file

=cut

use strict;
use warnings;
use Cwd;
use Debian::Debhelper::Dh_Lib;

our $VERSION = DH_BUILTIN_VERSION;

=head1 SYNOPSIS

B<dh_md5sums> [S<I<debhelper options>>] [B<-x>] [B<-X>I<item>] [B<--include-conffiles>]

=head1 DESCRIPTION

B<dh_md5sums> is a debhelper program that is responsible for generating
a F<DEBIAN/md5sums> file, which lists the md5sums of each file in the package.
These files are used by B<dpkg --verify> or the L<debsums(1)> program.

All files in F<DEBIAN/> are omitted from the F<md5sums> file, as are all
conffiles (unless you use the B<--include-conffiles> switch).

The md5sums file is installed with proper permissions and ownerships.

=head1 OPTIONS

=over 4

=item B<-x>, B<--include-conffiles>

Include conffiles in the md5sums list. Note that this information is
redundant since it is included elsewhere in Debian packages.

=item B<-X>I<item>, B<--exclude=>I<item>

Exclude files that contain I<item> anywhere in their filename from
being listed in the md5sums file.

=back

=cut

init(options => {
	"x" => \$dh{INCLUDE_CONFFILES}, # is -x for some unknown historical reason..
	"include-conffiles" => \$dh{INCLUDE_CONFFILES},
});

on_pkgs_in_parallel {
	foreach my $package (@_) {
		next if is_udeb($package);

		my $dbgsym_tmp = dbgsym_tmpdir($package);
		my $tmp=tmpdir($package);

		install_dir("$tmp/DEBIAN");

		# Check if we should exclude conffiles.
		my %conffiles;
		if (! $dh{INCLUDE_CONFFILES} && -r "$tmp/DEBIAN/conffiles") {
			# Generate exclude regexp.
			open(my $fd, '<', "$tmp/DEBIAN/conffiles")
				or error("open $tmp/DEBIAN/conffiles failed: $!");
			while (my $line = <$fd>) {
				chomp($line);
				$line =~ s/^\///;
				$conffiles{$line} = 1;
			}
			close($fd);
		}

		generate_md5sums_file($tmp, \%conffiles);
		if ( -d $dbgsym_tmp) {
			install_dir("${dbgsym_tmp}/DEBIAN");
			generate_md5sums_file($dbgsym_tmp);
		}
	}
};

sub generate_md5sums_file {
	my ($tmpdir, $conffiles) = @_;
	my $find_pid = open(my $find_fd, '-|') // error("fork failed: $!");
	my (@files, $pipeline_pid);
	if (not $find_pid) {
		# Child
		chdir($tmpdir) or error("chdir($tmpdir) failed: $!");
		exec { 'find' } 'find', '-type', 'f', '!', '-regex', './DEBIAN/.*', '-printf', "%P\\0";
	}
	local $/ = "\0";  # NUL-terminated input/"lines"
	while (my $line = <$find_fd>) {
		chomp($line);
		next if excludefile($line);
		next if $conffiles and %{$conffiles} and exists($conffiles->{$line});
		push(@files, $line);
	}
	close($find_fd) or error_exitcode("find -type f ! -regex './DEBIAN/.*' -printf '%P\\0'");
	@files = sort(@files);
	verbose_print("cd $tmpdir >/dev/null && " . q{xargs -r0 md5sum | perl -pe 'if (s@^\\\\@@) { s/\\\\\\\\/\\\\/g; }' > DEBIAN/md5sums});
	$pipeline_pid = open(my $pipeline_fd, '|-') // error("fork failed: $!");
	if (not $pipeline_pid) {
		# Child
		chdir($tmpdir) or error("chdir($tmpdir) failed: $!");
		exec { 'sh' } '/bin/sh', '-c', q{xargs -r0 md5sum | perl -pe 'if (s@^\\\\@@) { s/\\\\\\\\/\\\\/g; }' > DEBIAN/md5sums};
	}

	printf {$pipeline_fd} "%s\0", $_ for @files;  # @files include NUL-terminator
	close($pipeline_fd) or error_exitcode("cd $tmpdir >/dev/null && xargs -r0 md5sum | perl -pe 'if (s@^\\\\@@) { s/\\\\\\\\/\\\\/g; }' > DEBIAN/md5sums");
	reset_perm_and_owner(0644, "${tmpdir}/DEBIAN/md5sums");
	return;
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut

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