Re: [PATCH v4 18/19] iotests: Add tests for invalid Quorum @replaces

[Max Reitz <mreitz@redhat.com>]

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On 18.02.20 13:38, Kevin Wolf wrote:
> Am 18.02.2020 um 11:34 hat Max Reitz geschrieben:
>> Add two tests to see that you cannot replace a Quorum child with the
>> mirror job while the child is in use by a different parent.
>>
>> Signed-off-by: Max Reitz <mreitz@redhat.com>
>> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
>> ---
>>  tests/qemu-iotests/041     | 70 +++++++++++++++++++++++++++++++++++++-
>>  tests/qemu-iotests/041.out |  4 +--
>>  2 files changed, 71 insertions(+), 3 deletions(-)
>>
>> diff --git a/tests/qemu-iotests/041 b/tests/qemu-iotests/041
>> index 1d9e64ff6d..53c8671969 100755
>> --- a/tests/qemu-iotests/041
>> +++ b/tests/qemu-iotests/041
>> @@ -20,6 +20,7 @@
>>  
>>  import time
>>  import os
>> +import re
>>  import iotests
>>  from iotests import qemu_img, qemu_io
>>  
>> @@ -34,6 +35,8 @@ quorum_img3 = os.path.join(iotests.test_dir, 'quorum3.img')
>>  quorum_repair_img = os.path.join(iotests.test_dir, 'quorum_repair.img')
>>  quorum_snapshot_file = os.path.join(iotests.test_dir, 'quorum_snapshot.img')
>>  
>> +nbd_sock_path = os.path.join(iotests.test_dir, 'nbd.sock')
>> +
>>  class TestSingleDrive(iotests.QMPTestCase):
>>      image_len = 1 * 1024 * 1024 # MB
>>      qmp_cmd = 'drive-mirror'
>> @@ -892,7 +895,8 @@ class TestRepairQuorum(iotests.QMPTestCase):
>>  
>>      def tearDown(self):
>>          self.vm.shutdown()
>> -        for i in self.IMAGES + [ quorum_repair_img, quorum_snapshot_file ]:
>> +        for i in self.IMAGES + [ quorum_repair_img, quorum_snapshot_file,
>> +                                 nbd_sock_path ]:
>>              # Do a try/except because the test may have deleted some images
>>              try:
>>                  os.remove(i)
>> @@ -1032,6 +1036,70 @@ class TestRepairQuorum(iotests.QMPTestCase):
>>          self.assert_has_block_node("repair0", quorum_repair_img)
>>          self.vm.assert_block_path('quorum0', '/children.1', 'repair0')
>>  
>> +    def test_with_other_parent(self):
>> +        """
>> +        Check that we cannot replace a Quorum child when it has other
>> +        parents.
>> +        """
>> +        result = self.vm.qmp('nbd-server-start',
>> +                             addr={
>> +                                 'type': 'unix',
>> +                                 'data': {'path': nbd_sock_path}
>> +                             })
>> +        self.assert_qmp(result, 'return', {})
>> +
>> +        result = self.vm.qmp('nbd-server-add', device='img1')
>> +        self.assert_qmp(result, 'return', {})
>> +
>> +        result = self.vm.qmp('drive-mirror', job_id='mirror', device='quorum0',
>> +                             sync='full', node_name='repair0', replaces='img1',
>> +                             target=quorum_repair_img, format=iotests.imgfmt)
>> +        self.assert_qmp(result, 'error/desc',
>> +                        "Cannot replace 'img1' by a node mirrored from "
>> +                        "'quorum0', because it cannot be guaranteed that doing "
>> +                        "so would not lead to an abrupt change of visible data")
>> +
>> +    def test_with_other_parents_after_mirror_start(self):
>> +        """
>> +        The same as test_with_other_parent(), but add the NBD server
>> +        only when the mirror job is already running.
>> +        """
>> +        result = self.vm.qmp('nbd-server-start',
>> +                             addr={
>> +                                 'type': 'unix',
>> +                                 'data': {'path': nbd_sock_path}
>> +                             })
>> +        self.assert_qmp(result, 'return', {})
>> +
>> +        result = self.vm.qmp('drive-mirror', job_id='mirror', device='quorum0',
>> +                             sync='full', node_name='repair0', replaces='img1',
>> +                             target=quorum_repair_img, format=iotests.imgfmt)
>> +        self.assert_qmp(result, 'return', {})
>> +
>> +        result = self.vm.qmp('nbd-server-add', device='img1')
>> +        self.assert_qmp(result, 'return', {})
>> +
>> +        # The full error message goes to stderr, we will check it later
>> +        self.complete_and_wait('mirror',
>> +                               completion_error='Operation not permitted')
>> +
>> +        # Should not have been replaced
>> +        self.vm.assert_block_path('quorum0', '/children.1', 'img1')
>> +
>> +        # Check the full error message now
>> +        self.vm.shutdown()
>> +        log = self.vm.get_log()
>> +        log = re.sub(r'^\[I \d+\.\d+\] OPENED\n', '', log)
>> +        log = re.sub(r'^Formatting.*\n', '', log)
>> +        log = re.sub(r'\n\[I \+\d+\.\d+\] CLOSED\n?$', '', log)
>> +        log = re.sub(r'^qemu-system-[^:]*: ', '', log)
> 
> I would have applied the series, but:
> 
> +.........................F....................................................................
> +======================================================================
> +FAIL: test_with_other_parents_after_mirror_start (__main__.TestRepairQuorum)
> +----------------------------------------------------------------------
> +Traceback (most recent call last):
> +  File "041", line 1099, in test_with_other_parents_after_mirror_start
> +    "it can no longer be guaranteed that doing so would " +
> +AssertionError: "qemu: Can no longer replace 'img1' by 're[107 chars]data" != "Can no longer replace 'img1' by 'repair0'[101 chars]data"
> +- qemu: Can no longer replace 'img1' by 'repair0', because it can no longer be guaranteed that doing so would not lead to an abrupt change of visible data
> +? ------
> ++ Can no longer replace 'img1' by 'repair0', because it can no longer be guaranteed that doing so would not lead to an abrupt change of visible data
> +
> +
> 
> If you agree, I can just change this line while applying into:
> 
>     log = re.sub(r'^qemu[^:]*: ', '', log)

Sure, thanks!  I just hope noone uses the QEMU environment variable to
point to something that isn’t prefixed by “qemu”...

Max


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