iotests: Test sparseness for qemu-img convert -n

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200721135520.72355-3-kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/tests/qemu-iotests/122 b/tests/qemu-iotests/122
index dfd1cd0..0f3d4ca 100755
--- a/tests/qemu-iotests/122
+++ b/tests/qemu-iotests/122
@@ -282,6 +282,36 @@ $QEMU_IMG convert -O $IMGFMT -n "$TEST_IMG" "$TEST_IMG".orig
 $QEMU_IMG compare "$TEST_IMG" "$TEST_IMG".orig
 
 echo
+echo '=== -n to an empty image ==='
+echo
+
+TEST_IMG="$TEST_IMG".orig _make_test_img 64M
+
+# Convert with -n, which should not result in a fully allocated image, not even
+# with compat=0.10 (because the target doesn't have a backing file)
+for compat in "1.1" "0.10"; do
+    IMGOPTS="compat=$compat" _make_test_img 64M
+    $QEMU_IMG convert -O $IMGFMT -n "$TEST_IMG".orig "$TEST_IMG"
+    $QEMU_IMG map --output=json "$TEST_IMG"
+done
+
+echo
+echo '=== -n to an empty image with a backing file ==='
+echo
+
+TEST_IMG="$TEST_IMG".orig _make_test_img 64M
+TEST_IMG="$TEST_IMG".base _make_test_img 64M
+
+# Convert with -n, which should still not result in a fully allocated image for
+# compat=1.1 (because it can use zero clusters), but it should be fully
+# allocated with compat=0.10
+for compat in "1.1" "0.10"; do
+    IMGOPTS="compat=$compat" _make_test_img -b "$TEST_IMG".base -F $IMGFMT 64M
+    $QEMU_IMG convert -O $IMGFMT -n "$TEST_IMG".orig "$TEST_IMG"
+    $QEMU_IMG map --output=json "$TEST_IMG"
+done
+
+echo
 echo '=== -n -B to an image without a backing file ==='
 echo