-#!/bin/sh
+#!/bin/bash
-# Copyright (C) 2007 Google Inc.
+# Copyright (C) 2007, 2008, 2009 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
. common.sh
-dump -0 -q -f - "$blockdev"
+# If the target device is not a real block device we'll first losetup it.
+# This is needed for file disks.
+if [ ! -b $blockdev ]; then
+ ORIGINAL_BLOCKDEV=$blockdev
+ blockdev=$(losetup -sf $blockdev)
+ CLEANUP+=("losetup -d $blockdev")
+fi
+
+if [ "$PARTITION_STYLE" = "none" ]; then
+ filesystem_dev=$blockdev
+elif [ "$PARTITION_STYLE" = "msdos" ]; then
+ filesystem_dev=$(map_disk0 $blockdev)
+ CLEANUP+=("unmap_disk0 $blockdev")
+else
+ echo "Unknown partition style $PARTITION_STYLE"
+ exit 1
+fi
+
+vol_type=$($VOL_TYPE $filesystem_dev)
+
+if [ "${vol_type:0:3}" = "ext" ]; then
+ dump -0 -q -f - "$filesystem_dev"
+fi
+
+# execute cleanups
+cleanup
+trap - EXIT
+
+exit 0