Create path hirarchy of source path automatically in destination

Before it was only possible to backup root directories (depth one, eg.
/etc, /var, /usr, …). For example consider the following truncated toy
configuration for rsync:

    [general]
    mountpoint = /media/
    backupdir = backup
    [source]
    include = /foo/bar
    include = /etc

We assume you have prepared the existent but empty base-directory
/media/backup/ at your destination, then against the expectation, the
following error rises:

    rsync: mkdir "/media/backup/foo/bar/" failed: No such file or directory (2)

The reason is that rsync will take the files from the folder /foo/bar/
and tries to put them into the ulitmate – and therefore existent –
destination /media/backup/foo/bar. This is not what you would expect,
since the prepared directory /media/backup exists and the application
should create the rest itself.

This Merge Request adds a little script which creates the required
directories in the destination before running rsync. It assumes that
the base-directory already exists, so that not too much directories
are created automatically (could be a mess if you accidentally type the
wrong path)

handlers/rsync.in

@@ -749,6 +749,30 @@ function prepare_storage {
 
   section="`basename $SECTION`"
 
+  # create $SECTION directories, but not $backupdir
+  if [ "$dest" == "local" ]; then
+    if [ -d "$backupdir" ]; then
+      mkdir --parents $backupdir/$SECTION
+    else
+       fatal "The destination $backupdir does not exist"
+       exit 1
+    fi
+  else
+(
+    $ssh_cmd <<EOF
+      ##### BEGIN REMOTE SCRIPT #####
+      if [ -d "$backupdir" ]; then
+        mkdir --parents $backupdir/$SECTION
+      else
+        echo "FATAL: The destination $backupdir does not exist"
+        exit 1
+      fi
+      ##### END REMOTE SCRIPT #######
+EOF
+) | (while read a; do passthru $a; done)
+   
+  fi
+
   if [ "$format" == "short" ]; then
 
     suffix="$section.0"