Re: [Qemu-devel] [PATCH 4/4] iotests: Add test for failing mirror complete

[John Snow <jsnow@redhat.com>]

On 9/12/19 9:56 AM, Max Reitz wrote:
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>   tests/qemu-iotests/041     | 44 ++++++++++++++++++++++++++++++++++++++
>   tests/qemu-iotests/041.out |  4 ++--
>   2 files changed, 46 insertions(+), 2 deletions(-)
> 
> diff --git a/tests/qemu-iotests/041 b/tests/qemu-iotests/041
> index 8568426311..84bc6d6581 100755
> --- a/tests/qemu-iotests/041
> +++ b/tests/qemu-iotests/041
> @@ -1121,6 +1121,50 @@ class TestOrphanedSource(iotests.QMPTestCase):
>                                target='dest-ro')
>           self.assert_qmp(result, 'error/class', 'GenericError')
>   
> +    def test_failing_permission_in_complete(self):
> +        self.assert_no_active_block_jobs()
> +
> +        # Unshare consistent-read on the target
> +        # (The mirror job does not care)
> +        result = self.vm.qmp('blockdev-add',
> +                             driver='blkdebug',
> +                             node_name='dest-perm',
> +                             image='dest',
> +                             unshare_child_perms=['consistent-read'])
> +        self.assert_qmp(result, 'return', {})
> +
> +        result = self.vm.qmp('blockdev-mirror', job_id='job', device='src',
> +                             sync='full', target='dest',
> +                             filter_node_name='mirror-filter')
> +        self.assert_qmp(result, 'return', {})
> +
> +        # Require consistent-read on the source
> +        # (We can only add this node once the job has started, or it
> +        # will complain that it does not want to run on non-root nodes)
> +        result = self.vm.qmp('blockdev-add',
> +                             driver='blkdebug',
> +                             node_name='src-perm',
> +                             image='src',
> +                             take_child_perms=['consistent-read'])
> +        self.assert_qmp(result, 'return', {})
> +
> +        # While completing, mirror will attempt to replace src by
> +        # dest, which must fail because src-perm requires
> +        # consistent-read but dest-perm does not share it; thus
> +        # aborting the job when it is supposed to complete
> +        self.complete_and_wait('job',
> +                               completion_error='Operation not permitted')
> +
> +        # Assert that all of our nodes are still there (except for the
> +        # mirror filter, which should be gone despite the failure)
> +        nodes = self.vm.qmp('query-named-block-nodes')['return']
> +        nodes = list(map(lambda image: image['node-name'], nodes))

Sadly, the list comprehension is a good suggestion. Squash it in if 
you'd like.

> +
> +        for expect in ['src', 'src-perm', 'dest', 'dest-perm']:
> +            self.assertTrue(expect in nodes, '%s disappeared' % expect)

I could be a real weenie and say "why not use a tuple here?"

but, I'll only pretend I didn't say that instead of couching it in a 
self-deprecating wrapper to the same end effect.

(I'm a weenie.)

> +        self.assertFalse('mirror-filter' in nodes,
> +                         'Mirror filter node did not disappear')
> +
>   if __name__ == '__main__':
>       iotests.main(supported_fmts=['qcow2', 'qed'],
>                    supported_protocols=['file'])
> diff --git a/tests/qemu-iotests/041.out b/tests/qemu-iotests/041.out
> index 2c448b4239..f496be9197 100644
> --- a/tests/qemu-iotests/041.out
> +++ b/tests/qemu-iotests/041.out
> @@ -1,5 +1,5 @@
> -..........................................................................................
> +...........................................................................................
>   ----------------------------------------------------------------------
> -Ran 90 tests
> +Ran 91 tests
>   
>   OK
> 

Or don't do anything, because I'm just being obnoxious, and I owe you 
one for giving you bad advice last round.

Reviewed-by: John Snow <jsnow@redhat.com>