Mount partitions by "shortest mountpoint" order.

Partitions were mounted in config file order, so you could not see
all mounted partitions.

This (at least temporarily) fixes it.

KNOWN_BUGS

@@ -11,3 +11,18 @@ Bugs to fix before a 4.3 release
    http://xen-tools.org/pipermail/xen-tools-discuss/2010-May/000757.html
 
 * xen-delete-image ignores extension setting
+
+* partitions were mounted in config file order, not in mountpoint order.
+  That implies that if you specified :
+	/boot
+	/
+  in that order, / was mounted _over_ /boot, and you would not _see_ /boot.
+  Xen-Tools would then install boot on your / partition, and your boot device
+  was just empty and unbootable.
+
+  Workaround for 4.2 is to write your partition file such as mounts overlap
+  correctly when mounted in specified order.
+
+  Current (unreleased) fix is to sort by mountpoint length.
+
+  Fix would be to reproduce what mount does with mount -a.

bin/xen-create-image

@@ -3451,7 +3451,7 @@ sub mountImage
     #
     $MOUNT_POINT = tempdir( CLEANUP => 1 );
 
-    foreach my $partition (@PARTITIONS)
+    foreach my $partition (sort { length($a->{'mountpoint'}) <=> length($b->{'mountpoint'}) } @PARTITIONS)
     {
         if ( $partition->{ 'type' } ne 'swap' )
         {