If there's a new root fs, delete the old one

Otherwise xz will refuse to overwrite it. Explicitly delete it
instead of passing -f to xz because that also forces a lot of
other things, not just file overwrite.

Change-Id: Iec3c73c9ae4775039eb9c3afed91bfaa4ebedb5d

diff --git a/tests/net_test/run_net_test.sh b/tests/net_test/run_net_test.sh
index 8798e55..2bbd278 100755 (executable)
--- a/tests/net_test/run_net_test.sh
+++ b/tests/net_test/run_net_test.sh
@@ -26,6 +26,8 @@ set -e
 # Check if we need to uncompress the disk image.
 # We use xz because it compresses better: to 42M vs 72M (gzip) / 62M (bzip2).
 if [ $ROOTFS.xz -nt $ROOTFS ]; then
+  echo "Deleting $ROOTFS" >&2
+  rm -f $ROOTFS
   echo "Uncompressing $ROOTFS.xz" >&2
   unxz --keep $ROOTFS.xz
 fi