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

[Kevin Wolf <kwolf@redhat.com>]

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)

Kevin