--- /dev/null
+# Copyright 2007 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, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+package Dpkg::Path;
+
+use strict;
+use warnings;
+
+use Exporter;
+our @ISA = qw(Exporter);
+our @EXPORT_OK = qw(get_pkg_root_dir relative_to_pkg_root);
+
+=head1 NAME
+
+Dpkg::Path - some common path handling functions
+
+=head1 DESCRIPTION
+
+It provides some functions to handle various path.
+
+=head1 METHODS
+
+=over 8
+
+=item get_pkg_root_dir($file)
+
+This function will scan upwards the hierarchy of directory to find out
+the directory which contains the "DEBIAN" sub-directory and it will return
+its path. This directory is the root directory of a package being built.
+
+=cut
+
+sub get_pkg_root_dir($) {
+ my $file = shift;
+ $file =~ s{/+$}{};
+ $file =~ s{/+[^/]+$}{} if not -d $file;
+ do {
+ return $file if -d "$file/DEBIAN";
+ last if $file !~ m{/};
+ $file =~ s{/+[^/]+$}{};
+ } while ($file);
+ return undef;
+}
+
+=item relative_to_pkg_root($file)
+
+Returns the filename relative to get_pkg_root_dir($file).
+
+=cut
+
+sub relative_to_pkg_root($) {
+ my $file = shift;
+ my $pkg_root = get_pkg_root_dir($file);
+ if (defined $pkg_root) {
+ $pkg_root .= "/";
+ return $file if ($file =~ s/^\Q$pkg_root\E//);
+ }
+ return undef;
+}
+
+=back
+
+=head1 AUTHOR
+
+Raphael Hertzog <hertzog@debian.org>.
+
+=cut
+
+1;
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