qemu-iotests: Update filter for default cluster size

Until recently, qemu-img create displayed cluster_size=0 for the default
cluster size. It is changed to display the real cluster size now, which results
in the cluster size not being filtered out any more.

If the cluster size is specified explicitly in CLUSTER_SIZE, keep the output,
and if using the default, filter it out. This mostly restores the old behaviour
of the test cases; test 015 must be fixed to use CLUSTER_SIZE instead of using
extra_img_options for it.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

tests/qemu-iotests/015

@@ -56,7 +56,8 @@ echo "creating image"
 # for the refcount table. On the other hand this is big enough to cause a
 # refcount table growth when rewriting the image after creating one snapshot.
 size=36M
-_make_test_img -o cluster_size=1k $size
+CLUSTER_SIZE=1k
+_make_test_img $size
 
 # Create two snapshots which fill the image with two different patterns
 echo "creating first snapshot"

tests/qemu-iotests/common.rc

@@ -58,9 +58,11 @@ _make_test_img()
     # extra qemu-img options can be added by tests
     # at least one argument (the image size) needs to be added
     local extra_img_options=$*
+    local cluster_size_filter="s# cluster_size=[0-9]\\+##g"
 
     if [ \( "$IMGFMT" = "qcow2" -o "$IMGFMT" = "qed" \) -a -n "$CLUSTER_SIZE" ]; then
         extra_img_options="-o cluster_size=$CLUSTER_SIZE $extra_img_options"
+        cluster_size_filter=""
     fi
 
     # XXX(hch): have global image options?
@@ -69,7 +71,7 @@ _make_test_img()
     	sed -e "s#$TEST_DIR#TEST_DIR#g" | \
     	sed -e "s#$IMGFMT#IMGFMT#g" | \
 	sed -e "s# encryption=off##g" | \
-	sed -e "s# cluster_size=0##g" | \
+	sed -e "$cluster_size_filter" | \
 	sed -e "s# table_size=0##g" | \
 	sed -e "s# compat6=off##g" | \
 	sed -e "s# static=off##g"