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[PATCH v2 13/15] iotests/linters: Add workaround for mypy bug #9852
From: |
John Snow |
Subject: |
[PATCH v2 13/15] iotests/linters: Add workaround for mypy bug #9852 |
Date: |
Tue, 19 Oct 2021 10:49:16 -0400 |
This one is insidious: if you write an import as "from {namespace}
import {subpackage}" as mirror-top-perms (now) does, mypy will fail on
every-other invocation *if* the package being imported is a typed,
installed, namespace-scoped package.
Upsettingly, that's exactly what 'qemu.[aqmp|qmp|machine]' et al are in
the context of Python CI tests.
Now, I could just edit mirror-top-perms to avoid this invocation, but
since I tripped on a landmine, I might as well head it off at the pass
and make sure nobody else trips on that same landmine.
It seems to have something to do with the order in which files are
checked as well, meaning the random order in which set(os.listdir())
produces the list of files to test will cause problems intermittently
and not just strictly "every other run".
This will be fixed in mypy >= 0.920, which is not released yet. The
workaround for now is to disable incremental checking, which avoids the
issue.
Note: This workaround is not applied when running iotest 297 directly,
because the bug does not surface there! Given the nature of CI jobs not
starting with any stale cache to begin with, this really only has a
half-second impact on manual runs of the Python test suite when executed
directly by a developer on their local machine. The workaround may be
removed when the Python package requirements can stipulate mypy 0.920 or
higher, which can happen as soon as it is released. (Barring any
unforseen compatibility issues that 0.920 may bring with it.)
See also:
https://github.com/python/mypy/issues/11010
https://github.com/python/mypy/issues/9852
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
---
tests/qemu-iotests/linters.py | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tests/qemu-iotests/linters.py b/tests/qemu-iotests/linters.py
index 46c28fdcda0..65c4c4e8272 100644
--- a/tests/qemu-iotests/linters.py
+++ b/tests/qemu-iotests/linters.py
@@ -93,7 +93,9 @@ def show_usage() -> None:
if sys.argv[1] == '--pylint':
run_linter('pylint', files)
elif sys.argv[1] == '--mypy':
- run_linter('mypy', files)
+ # mypy bug #9852; disable incremental checking as a workaround.
+ args = ['--no-incremental'] + files
+ run_linter('mypy', args)
else:
print(f"Unrecognized argument: '{sys.argv[1]}'", file=sys.stderr)
show_usage()
--
2.31.1
- [PATCH v2 05/15] iotests/297: Don't rely on distro-specific linter binaries, (continued)
- [PATCH v2 05/15] iotests/297: Don't rely on distro-specific linter binaries, John Snow, 2021/10/19
- [PATCH v2 08/15] iotests/297: Change run_linter() to raise an exception on failure, John Snow, 2021/10/19
- [PATCH v2 07/15] iotests/297: refactor run_[mypy|pylint] as generic execution shim, John Snow, 2021/10/19
- [PATCH v2 14/15] python: Add iotest linters to test suite, John Snow, 2021/10/19
- [PATCH v2 06/15] iotests/297: Split run_linters apart into run_pylint and run_mypy, John Snow, 2021/10/19
- [PATCH v2 09/15] iotests/297: update tool availability checks, John Snow, 2021/10/19
- [PATCH v2 13/15] iotests/linters: Add workaround for mypy bug #9852,
John Snow <=
- [PATCH v2 10/15] iotests/297: split test into sub-cases, John Snow, 2021/10/19
- [PATCH v2 11/15] iotests: split linters.py out from 297, John Snow, 2021/10/19
[PATCH v2 12/15] iotests/linters: Add entry point for linting via Python CI, John Snow, 2021/10/19