Backup ReadyNas to ReadyNas with rsync and exclude lists

Here's an improved version of my patch. Previously, the extra rsync options would only be used if the back-up source was an rsync server. The new version will also use the options when the back-up destination is an rsync server.

Let's suppose your /frontview/conf/rsync.conf file looks like this:

foo.caliban.org::slash/var/named!!--exclude chroot/proc --delete-excluded
127.0.0.1::USB_HDD_1/backup!!--size-only

The first line is the configuration for the job described in my last posting.

The second line shows a new job, that backs up a local ReadyNAS share to a USB-attached hard drive. The job could also be configured as a simple share back-up, but that wouldn't allow files that have since been removed from the source to also be removed from the destination. Only rsync jobs allow this (the --delete flag), so we have to use that, even though both source and destination are actually local.

The --size-only flag is often needed when the source and destination file-systems aren't the same time. If copying from Linux ext3 to Windows FAT, for example, there will be discrepancies in the timestamps that cause all files to be copied from the source to the destination, defeating the main purpose of rsync. --size-only tells rsync to use only the size of the file to determine whether or not the file has changed on the source.

--- backup.orig 2008-09-25 15:56:13.000000000 +0200
+++ backup      2008-10-04 00:43:28.000000000 +0200
@@ -244,6 +244,29 @@
   $rsync_option .= " --delete";
 }
 
+my $rsync_option_file = '/frontview/conf/rsync.conf';
+if( -f $rsync_option_file && ( $backup_source_share_proto eq 'rsync' ||
+                              $backup_dest_share_proto eq 'rsync' ) )
+{
+  open(RSYNC, $rsync_option_file);
+  my @rsync = <RSYNC>;
+  close(RSYNC);
+
+  my $row = (grep(/$backup_source_path/, @rsync))[0];
+
+  unless( $row )
+  {
+    $row = (grep(/$backup_dest_path/, @rsync))[0];
+  }
+
+  if( $row )
+  {
+    my ($extra_options) = (split $FS, $row)[1];
+    chomp($extra_options);
+    $rsync_option .= " $extra_options";
+  }
+}
+
 my $mount_point = "/job_${job}";
 my $login_param;
 my $source_path = "/$backup_source_share_proto/$backup_source_path";