#!/usr/bin/perl -w

=head1 NAME

dh_md5sums - generate DEBIAN/md5sums file

=cut

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

=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 the B<debsums> package.

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},
});

foreach my $package (@{$dh{DOPACKAGES}}) {
	next if is_udeb($package);
	
	my $tmp=tmpdir($package);

	if (! -d "$tmp/DEBIAN") {
		doit("install","-d","$tmp/DEBIAN");
	}

	# Check if we should exclude conffiles.
	my $exclude="";
	if (! $dh{INCLUDE_CONFFILES} && -r "$tmp/DEBIAN/conffiles") {
		# Generate exclude regexp.
		open (CONFF,"$tmp/DEBIAN/conffiles");
		while (<CONFF>) {
			chomp;
			s/^\///;
			$exclude.="! -path \"./$_\" ";
		}
		close CONFF;
	}
	
	# See if we should exclude other files.
	if (defined($dh{EXCLUDE_FIND}) && $dh{EXCLUDE_FIND} ne '') {
		$exclude.="! \\( $dh{EXCLUDE_FIND} \\) ";
	}
	
	my $find="find . -type f $exclude ! -regex '.*/DEBIAN/.*' -printf '%P\\0'";
	complex_doit("(cd $tmp >/dev/null ; $find | LC_ALL=C sort -z | xargs -r0 md5sum > DEBIAN/md5sums) >/dev/null");
	# If the file's empty, no reason to waste inodes on it.
	if (-z "$tmp/DEBIAN/md5sums") {
		doit("rm","-f","$tmp/DEBIAN/md5sums");
	}
	else {
		doit("chmod",644,"$tmp/DEBIAN/md5sums");
		doit("chown","0:0","$tmp/DEBIAN/md5sums");
	}
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut