--- /dev/null
+package C4::Installer::UpgradeBackup;
+
+# Copyright (C) 2008 LibLime
+#
+# This file is part of Koha.
+#
+# Koha 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 3 of the License, or
+# (at your option) any later version.
+#
+# Koha 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 Koha; if not, see <http://www.gnu.org/licenses>.
+
+use strict;
+#use warnings; FIXME - Bug 2505
+use File::Compare qw(compare);
+use Cwd qw(cwd);
+use File::Copy;
+use File::Find;
+use File::Spec;
+use Exporter;
+
+use vars qw(@ISA @EXPORT );
+
+@ISA = ('Exporter');
+@EXPORT = ('backup_changed_files');
+
+=head1 NAME
+
+C4::Installer::UpgradeBackup
+
+=head1 DESCRIPTION
+
+This is a helper module used during a 'make upgrade' that
+creates backups of files updated during an upgrade.
+
+=cut
+
+sub backup_changed_files {
+ my $from_to = shift;
+ my $suffix = shift;
+ my $verbose = shift;
+ my $inc_uninstall = shift;
+
+ my $cwd = cwd();
+ foreach my $sourceroot (sort keys %$from_to) {
+ my $targetroot = $from_to->{$sourceroot};
+ my $currdir = File::Spec->catdir($cwd, $sourceroot);
+
+ next unless -d $currdir;
+
+ chdir $currdir or die "could not change to $currdir: $!";
+
+ # expand path
+ find(sub {
+ return unless -f $_;
+ my $filename = $_;
+
+ my $targetdir = File::Spec->catdir($targetroot, $File::Find::dir);
+ my $targetfile = File::Spec->catfile($targetdir, $filename);
+ my $sourcedir = File::Spec->catdir($currdir, $File::Find::dir);
+ my $sourcefile = File::Spec->catfile($sourcedir, $filename);
+
+ if (-f $targetfile) {
+ my ($size) = (stat $sourcefile)[7];
+ my $backup = $targetfile . $suffix;
+ unless (-s $targetfile == $size and not compare($sourcefile, $targetfile)) {
+ print "Backed up $targetfile to $backup\n";
+ File::Copy::copy($targetfile, $backup);
+ }
+ }
+ }, ".");
+ }
+}
+
+=head1 AUTHOR
+
+Code based on parts of ExtUtils::Install in order to
+approximately track how it identifies files to
+install.
+
+Koha Development Team <http://koha-community.org/>
+
+Galen Charlton <galen.charlton@liblime.com>
+
+=cut
+
+1;