Bug 18373: Re-add UpgradeBackup.pm

Bug 18028 removed the install_misc directory but
install_misc/UpgradeBackup.pm was still used by the 'upgrade' rule of
make.

Other files from install_misc were useless to it may be better not to
reintroduce this directory with only 1 file.

Test plan:
`make`
`sudo make install`
`make upgrade`

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

C4/Installer/UpgradeBackup.pm

@@ -0,0 +1,94 @@
+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;

Makefile.PL

@@ -1687,7 +1687,7 @@ sub upgrade {
     }
 
     $upgrade .= qq/
-MOD_BACKUP = \$(ABSPERLRUN) -Minstall_misc::UpgradeBackup -e 'backup_changed_files({\@ARGV}, '$backup_suffix', '\''\$(VERBINST)'\'', '\''\$(UNINST)'\'');' --
+MOD_BACKUP = \$(ABSPERLRUN) -MC4::Installer::UpgradeBackup -e 'backup_changed_files({\@ARGV}, '$backup_suffix', '\''\$(VERBINST)'\'', '\''\$(UNINST)'\'');' --
 
 upgrade :: make_upgrade_backup install
 \t\$(NOECHO) \$(NOOP)