iotests: blacklist 194 with the luks driver

The 194 test has a lot of code that assumes a simple image file. Rewriting
this to work with luks is possible, but non-trivial, so blacklist the
luks format for now.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <20170901105434.3288-3-berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Tested-by: Fam Zheng <famz@redhat.com>
[eblake: commit message typo fixed]
Reviewed-by: Kashyap Chamarthy <kchamart@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

tests/qemu-iotests/194

@@ -21,6 +21,7 @@
 
 import iotests
 
+iotests.verify_image_format(unsupported_fmts=['luks'])
 iotests.verify_platform(['linux'])
 
 with iotests.FilePath('source.img') as source_img_path, \

tests/qemu-iotests/iotests.py

@@ -421,9 +421,11 @@ def notrun(reason):
     print '%s not run: %s' % (seq, reason)
     sys.exit(0)
 
-def verify_image_format(supported_fmts=[]):
+def verify_image_format(supported_fmts=[], unsupported_fmts=[]):
     if supported_fmts and (imgfmt not in supported_fmts):
         notrun('not suitable for this image format: %s' % imgfmt)
+    if unsupported_fmts and (imgfmt in unsupported_fmts):
+        notrun('not suitable for this image format: %s' % imgfmt)
 
 def verify_platform(supported_oses=['linux']):
     if True not in [sys.platform.startswith(x) for x in supported_oses]: