[PATCH v2 0/3] iotests: Check for zstd support

[PATCH v2 0/3] iotests: Check for zstd support

[Hanna Reitz]

Hi,

v1 cover letter:

https://lists.nongnu.org/archive/html/qemu-devel/2022-02/msg04592.html

We have two tests (as far as I know) that use compression_type=zstd for
qcow2 but do not check whether that is actually supported.  Thomas
reported this for 065, but it’s also the case for 303.

This series makes 303 be skipped when zstd is not compiled in, and has
065 use zlib for each of its test cases then (it was made to use zstd
just to improve on coverage, so using zlib as a fallback is perfectly
fine).

v2:
- Add the first patch so that 065 and 303 can use these new iotests.py
  functions to check for zstd support instead of checking for their own
  qemu-img create’s output
- Have 065 fall back to zlib instead of skipping zstd test cases


Hanna Reitz (3):
  iotests.py: Add supports_qcow2_zstd_compression()
  iotests/065: Check for zstd support
  iotests/303: Check for zstd support

 tests/qemu-iotests/065        | 24 ++++++++++++++++++------
 tests/qemu-iotests/303        |  4 +++-
 tests/qemu-iotests/iotests.py | 21 +++++++++++++++++++++
 3 files changed, 42 insertions(+), 7 deletions(-)

-- 
2.34.1

[PATCH v2 1/3] iotests.py: Add supports_qcow2_zstd_compression()

[Hanna Reitz]

Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
---
 tests/qemu-iotests/iotests.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 6027780180..ce60abcadc 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -1377,6 +1377,27 @@ def verify_working_luks():
     if not working:
         notrun(reason)
 
+def supports_qcow2_zstd_compression() -> bool:
+    img_file = f'{test_dir}/qcow2-zstd-test.qcow2'
+    (output, status) = \
+        qemu_img_pipe_and_status('create', '-f', 'qcow2',
+                                 '-o', 'compression_type=zstd',
+                                 img_file, '0')
+    try:
+        os.remove(img_file)
+    except OSError:
+        pass
+
+    if status == 1 and \
+            "'compression-type' does not accept value 'zstd'" in output:
+        return False
+    else:
+        return True
+
+def verify_qcow2_zstd_compression():
+    if not supports_qcow2_zstd_compression():
+        notrun('zstd compression not supported')
+
 def qemu_pipe(*args: str) -> str:
     """
     Run qemu with an option to print something and exit (e.g. a help option).
-- 
2.34.1

[PATCH v2 2/3] iotests/065: Check for zstd support

[Hanna Reitz]

Some test cases run in iotest 065 want to run with zstd compression just
for added coverage.  Run them with zlib if there is no zstd support
compiled in.

Reported-by: Thomas Huth <thuth@redhat.com>
Fixes: 12a936171d71f839dc907ff ("iotest 065: explicit compression type")
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
---
 tests/qemu-iotests/065 | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/tests/qemu-iotests/065 b/tests/qemu-iotests/065
index f7c1b68dad..d1a72923c9 100755
--- a/tests/qemu-iotests/065
+++ b/tests/qemu-iotests/065
@@ -24,7 +24,7 @@ import os
 import re
 import json
 import iotests
-from iotests import qemu_img, qemu_img_pipe
+from iotests import qemu_img, qemu_img_pipe, supports_qcow2_zstd_compression
 import unittest
 
 test_img = os.path.join(iotests.test_dir, 'test.img')
@@ -96,11 +96,17 @@ class TestQCow2(TestQemuImgInfo):
 
 class TestQCow3NotLazy(TestQemuImgInfo):
     '''Testing a qcow2 version 3 image with lazy refcounts disabled'''
-    img_options = 'compat=1.1,lazy_refcounts=off,compression_type=zstd'
+    if supports_qcow2_zstd_compression():
+        compression_type = 'zstd'
+    else:
+        compression_type = 'zlib'
+
+    img_options = 'compat=1.1,lazy_refcounts=off'
+    img_options += f',compression_type={compression_type}'
     json_compare = { 'compat': '1.1', 'lazy-refcounts': False,
                      'refcount-bits': 16, 'corrupt': False,
-                     'compression-type': 'zstd', 'extended-l2': False }
-    human_compare = [ 'compat: 1.1', 'compression type: zstd',
+                     'compression-type': compression_type, 'extended-l2': False }
+    human_compare = [ 'compat: 1.1', f'compression type: {compression_type}',
                       'lazy refcounts: false', 'refcount bits: 16',
                       'corrupt: false', 'extended l2: false' ]
 
@@ -127,11 +133,17 @@ class TestQCow3NotLazyQMP(TestQMP):
 class TestQCow3LazyQMP(TestQMP):
     '''Testing a qcow2 version 3 image with lazy refcounts enabled, opening
        with lazy refcounts disabled'''
-    img_options = 'compat=1.1,lazy_refcounts=on,compression_type=zstd'
+    if supports_qcow2_zstd_compression():
+        compression_type = 'zstd'
+    else:
+        compression_type = 'zlib'
+
+    img_options = 'compat=1.1,lazy_refcounts=on'
+    img_options += f',compression_type={compression_type}'
     qemu_options = 'lazy-refcounts=off'
     compare = { 'compat': '1.1', 'lazy-refcounts': True,
                 'refcount-bits': 16, 'corrupt': False,
-                'compression-type': 'zstd', 'extended-l2': False }
+                'compression-type': compression_type, 'extended-l2': False }
 
 TestImageInfoSpecific = None
 TestQemuImgInfo = None
-- 
2.34.1

[PATCH v2 3/3] iotests/303: Check for zstd support

[Hanna Reitz]

303 runs two test cases, one of which requires zstd support.
Unfortunately, given that this is not a unittest-style test, we cannot
easily skip that single case, and instead can only skip the whole test.

(Alternatively, we could split this test into a zlib and a zstd part,
but that seems excessive, given that this test is not in auto and thus
likely only run by developers who have zstd support compiled in.)

Fixes: 677e0bae686e7c670a71d1f ("iotest 303: explicit compression type")
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
---
 tests/qemu-iotests/303 | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tests/qemu-iotests/303 b/tests/qemu-iotests/303
index 16c2e10827..25c3e7eaaa 100755
--- a/tests/qemu-iotests/303
+++ b/tests/qemu-iotests/303
@@ -21,10 +21,12 @@
 
 import iotests
 import subprocess
-from iotests import qemu_img_create, qemu_io, file_path, log, filter_qemu_io
+from iotests import qemu_img_create, qemu_io, file_path, log, filter_qemu_io, \
+        verify_qcow2_zstd_compression
 
 iotests.script_initialize(supported_fmts=['qcow2'],
                           unsupported_imgopts=['refcount_bits', 'compat'])
+verify_qcow2_zstd_compression()
 
 disk = file_path('disk')
 chunk = 1024 * 1024
-- 
2.34.1

Re: [PATCH v2 0/3] iotests: Check for zstd support

[Hanna Reitz]

Ping

On 02.03.22 13:45, Hanna Reitz wrote:
> Hi,
>
> v1 cover letter:
>
> https://lists.nongnu.org/archive/html/qemu-devel/2022-02/msg04592.html
>
> We have two tests (as far as I know) that use compression_type=zstd for
> qcow2 but do not check whether that is actually supported.  Thomas
> reported this for 065, but it’s also the case for 303.
>
> This series makes 303 be skipped when zstd is not compiled in, and has
> 065 use zlib for each of its test cases then (it was made to use zstd
> just to improve on coverage, so using zlib as a fallback is perfectly
> fine).
>
> v2:
> - Add the first patch so that 065 and 303 can use these new iotests.py
>    functions to check for zstd support instead of checking for their own
>    qemu-img create’s output
> - Have 065 fall back to zlib instead of skipping zstd test cases
>
>
> Hanna Reitz (3):
>    iotests.py: Add supports_qcow2_zstd_compression()
>    iotests/065: Check for zstd support
>    iotests/303: Check for zstd support
>
>   tests/qemu-iotests/065        | 24 ++++++++++++++++++------
>   tests/qemu-iotests/303        |  4 +++-
>   tests/qemu-iotests/iotests.py | 21 +++++++++++++++++++++
>   3 files changed, 42 insertions(+), 7 deletions(-)
>

Re: [PATCH v2 0/3] iotests: Check for zstd support

[Thomas Huth]

On 02/03/2022 13.45, Hanna Reitz wrote:
> Hi,
> 
> v1 cover letter:
> 
> https://lists.nongnu.org/archive/html/qemu-devel/2022-02/msg04592.html
> 
> We have two tests (as far as I know) that use compression_type=zstd for
> qcow2 but do not check whether that is actually supported.  Thomas
> reported this for 065, but it’s also the case for 303.
> 
> This series makes 303 be skipped when zstd is not compiled in, and has
> 065 use zlib for each of its test cases then (it was made to use zstd
> just to improve on coverage, so using zlib as a fallback is perfectly
> fine).
> 
> v2:
> - Add the first patch so that 065 and 303 can use these new iotests.py
>    functions to check for zstd support instead of checking for their own
>    qemu-img create’s output
> - Have 065 fall back to zlib instead of skipping zstd test cases
> 
> 
> Hanna Reitz (3):
>    iotests.py: Add supports_qcow2_zstd_compression()
>    iotests/065: Check for zstd support
>    iotests/303: Check for zstd support
> 
>   tests/qemu-iotests/065        | 24 ++++++++++++++++++------
>   tests/qemu-iotests/303        |  4 +++-
>   tests/qemu-iotests/iotests.py | 21 +++++++++++++++++++++
>   3 files changed, 42 insertions(+), 7 deletions(-)

Thanks, this fixes the failures of 065 and 303 on my system!

Series
Tested-by: Thomas Huth <thuth@redhat.com>

Re: [PATCH v2 0/3] iotests: Check for zstd support

[Vladimir Sementsov-Ogievskiy]

22.03.2022 12:48, Hanna Reitz wrote:
> Ping
> 
> On 02.03.22 13:45, Hanna Reitz wrote:
>> Hi,
>>
>> v1 cover letter:
>>
>> https://lists.nongnu.org/archive/html/qemu-devel/2022-02/msg04592.html
>>
>> We have two tests (as far as I know) that use compression_type=zstd for
>> qcow2 but do not check whether that is actually supported.  Thomas
>> reported this for 065, but it’s also the case for 303.
>>
>> This series makes 303 be skipped when zstd is not compiled in, and has
>> 065 use zlib for each of its test cases then (it was made to use zstd
>> just to improve on coverage, so using zlib as a fallback is perfectly
>> fine).
>>
>> v2:
>> - Add the first patch so that 065 and 303 can use these new iotests.py
>>    functions to check for zstd support instead of checking for their own
>>    qemu-img create’s output
>> - Have 065 fall back to zlib instead of skipping zstd test cases
>>
>>
>> Hanna Reitz (3):
>>    iotests.py: Add supports_qcow2_zstd_compression()
>>    iotests/065: Check for zstd support
>>    iotests/303: Check for zstd support
>>
>>   tests/qemu-iotests/065        | 24 ++++++++++++++++++------
>>   tests/qemu-iotests/303        |  4 +++-
>>   tests/qemu-iotests/iotests.py | 21 +++++++++++++++++++++
>>   3 files changed, 42 insertions(+), 7 deletions(-)
>>
> 

Reviewed-by: Vladimir Sementsov-Ogievskiy <v.sementsov-og@mail.ru>

-- 
Best regards,
Vladimir

Re: [PATCH v2 0/3] iotests: Check for zstd support

[Hanna Reitz]

On 02.03.22 13:45, Hanna Reitz wrote:
> Hi,
>
> v1 cover letter:
>
> https://lists.nongnu.org/archive/html/qemu-devel/2022-02/msg04592.html
>
> We have two tests (as far as I know) that use compression_type=zstd for
> qcow2 but do not check whether that is actually supported.  Thomas
> reported this for 065, but it’s also the case for 303.
>
> This series makes 303 be skipped when zstd is not compiled in, and has
> 065 use zlib for each of its test cases then (it was made to use zstd
> just to improve on coverage, so using zlib as a fallback is perfectly
> fine).

Thanks a lot for the quick replies to my ping!

Regrettably, I forgot to consider that John’s recent changes would 
remove qemu_img_pipe_and_status(), which is used in patch 1...  I’m 
sorry, but I’ll have to send a v3. :/

Hanna