export: add support for ext4 filesystems

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

diff --git a/export b/export
index fccf4b0..d0afa68 100755 (executable)
--- a/export
+++ b/export
@@ -41,7 +41,7 @@ fi
 
 vol_type=$($VOL_TYPE $filesystem_dev)
 
-if [ "$vol_type" = "ext3" -o "$vol_type" = "ext2" ]; then
+if [ "${vol_type:0:3}" = "ext" ]; then
   dump -0 -q -f - "$filesystem_dev"
 fi