hw_vars: Add more debug information for losetup failure

Signed-off-by: Huang, Ying <ying.huang@intel.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/hw_vars b/hw_vars
index 0939b63..b83a995 100755
--- a/hw_vars
+++ b/hw_vars
@@ -32,6 +32,7 @@ create_loop_devices()
 {
 	local i
 
+	modprobe loop 2>/dev/null
 	[ -e "/dev/loop0" ] || modprobe loop 2>/dev/null
 
 	for i in $(seq 0 8)
@@ -64,7 +65,12 @@ create_sparse_root () {
 		create_loop_devices
 		$CMD mount -o loop $SPARSE_ROOT.img $SPARSE_ROOT 2>/dev/null || {
 			local loop_dev=$(losetup -f --show $SPARSE_ROOT.img)
-			[ -n "$loop_dev" ] || exit
+			[ -n "$loop_dev" ] || {
+				grep -q loop /proc/devices || echo 'No loop block device!' >&2
+				lsmod | grep -q loop || echo 'No loop module' >&2
+				LOOPDEV_DEBUG=1 losetup -f --show $SPARSE_ROOT.img
+				exit
+			}
 			mount $loop_dev $SPARSE_ROOT
 		}
 	fi