iotests: Do not needlessly filter _make_test_img

In most cases, _make_test_img does not need a _filter_imgfmt on top.  It
does that by itself.

(The exception is when IMGFMT has been overwritten but TEST_IMG has not.
In such cases, we do need a _filter_imgfmt on top to filter the test's
original IMGFMT from TEST_IMG.)

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20201027190600.192171-8-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/161

@@ -48,9 +48,9 @@ _supported_os Linux
 IMG_SIZE=1M
 
 # Create the images
-TEST_IMG="$TEST_IMG.base" _make_test_img $IMG_SIZE | _filter_imgfmt
-TEST_IMG="$TEST_IMG.int" _make_test_img -b "$TEST_IMG.base" -F $IMGFMT | _filter_imgfmt
-_make_test_img -b "$TEST_IMG.int" -F $IMGFMT -F $IMGFMT | _filter_imgfmt
+TEST_IMG="$TEST_IMG.base" _make_test_img $IMG_SIZE
+TEST_IMG="$TEST_IMG.int" _make_test_img -b "$TEST_IMG.base" -F $IMGFMT
+_make_test_img -b "$TEST_IMG.int" -F $IMGFMT -F $IMGFMT
 
 # First test: reopen $TEST.IMG changing the detect-zeroes option on
 # its backing file ($TEST_IMG.int).
@@ -105,9 +105,9 @@ echo
 echo "*** Commit and then change an option on the backing file"
 echo
 # Create the images again
-TEST_IMG="$TEST_IMG.base" _make_test_img $IMG_SIZE | _filter_imgfmt
-TEST_IMG="$TEST_IMG.int" _make_test_img -b "$TEST_IMG.base" -F $IMGFMT| _filter_imgfmt
-_make_test_img -b "$TEST_IMG.int" -F $IMGFMT | _filter_imgfmt
+TEST_IMG="$TEST_IMG.base" _make_test_img $IMG_SIZE
+TEST_IMG="$TEST_IMG.int" _make_test_img -b "$TEST_IMG.base" -F $IMGFMT
+_make_test_img -b "$TEST_IMG.int" -F $IMGFMT
 
 _launch_qemu -drive if=none,file="${TEST_IMG}"
 _send_qemu_cmd $QEMU_HANDLE \

tests/qemu-iotests/175

@@ -89,20 +89,20 @@ min_blocks=$(stat -c '%b' "$TEST_DIR/empty")
 
 echo
 echo "== creating image with default preallocation =="
-_make_test_img -o extent_size_hint=0 $size | _filter_imgfmt
+_make_test_img -o extent_size_hint=0 $size
 stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $size
 
 for mode in off full falloc; do
     echo
     echo "== creating image with preallocation $mode =="
-    _make_test_img -o preallocation=$mode,extent_size_hint=0 $size | _filter_imgfmt
+    _make_test_img -o preallocation=$mode,extent_size_hint=0 $size
     stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $size
 done
 
 for new_size in 4096 1048576; do
     echo
     echo "== resize empty image with block_resize =="
-    _make_test_img -o extent_size_hint=0 0 | _filter_imgfmt
+    _make_test_img -o extent_size_hint=0 0
     _block_resize $TEST_IMG $new_size >/dev/null
     stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $new_size
 done

tests/qemu-iotests/249

@@ -48,9 +48,9 @@ _supported_os Linux
 IMG_SIZE=1M
 
 # Create the images: base <- int <- active
-TEST_IMG="$TEST_IMG.base" _make_test_img $IMG_SIZE | _filter_imgfmt
-TEST_IMG="$TEST_IMG.int" _make_test_img -b "$TEST_IMG.base" -F $IMGFMT | _filter_imgfmt
-_make_test_img -b "$TEST_IMG.int" -F $IMGFMT | _filter_imgfmt
+TEST_IMG="$TEST_IMG.base" _make_test_img $IMG_SIZE
+TEST_IMG="$TEST_IMG.int" _make_test_img -b "$TEST_IMG.base" -F $IMGFMT
+_make_test_img -b "$TEST_IMG.int" -F $IMGFMT
 
 # Launch QEMU with these two drives:
 # none0: base (read-only)