[Qemu-block] [PATCH v3 5/8] iotests: Let skip_if_unsupported() accept a method

[Max Reitz]

This lets tests use skip_if_unsupported() with a potentially variable
list of required formats.

Suggested-by: Kevin Wolf <kw...@redhat.com>
Signed-off-by: Max Reitz <mre...@redhat.com>
---
 tests/qemu-iotests/iotests.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 726f904f50..8f315538e9 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -893,8 +893,12 @@ def skip_if_unsupported(required_formats=[], 
read_only=False):
        Runs the test if all the required formats are whitelisted'''
     def skip_test_decorator(func):
         def func_wrapper(*args, **kwargs):
-            usf_list = list(set(required_formats) -
-                            set(supported_formats(read_only)))
+            if callable(required_formats):
+                fmts = required_formats(args[0])
+            else:
+                fmts = required_formats
+
+            usf_list = list(set(fmts) - set(supported_formats(read_only)))
             if usf_list:
                 args[0].case_skip('{}: formats {} are not whitelisted'.format(
                     args[0], usf_list))
-- 
2.21.0