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Merged
merged 3 commits into from
Jun 30, 2025
Merged

gh-85702: Catch PermissionError in zoneinfo.load_tzdata() #136117

merged 3 commits into from
Jun 30, 2025

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vstinner
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@vstinner vstinner commented Jun 30, 2025 •
edited by bedevere-app bot
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@vstinner vstinner added needs backport to 3.13 bugs and security fixes needs backport to 3.14 bugs and security fixes labels Jun 30, 2025
@bedevere-app bedevere-app bot mentioned this pull request Jun 30, 2025
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vstinner commented Jun 30, 2025 •
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On Windows, test_zoneinfo.test_bad_keys() fails without this fix if tzdata is installed.

vstinner@WIN C:\victor\python\main>env\scripts\python -m test test_zoneinfo -m test_bad_keys -v
...
ERROR: test_bad_keys (test.test_zoneinfo.test_zoneinfo.CTZDataTests.test_bad_keys)  
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\victor\python\main\Lib\test\test_zoneinfo\test_zoneinfo.py", line 231, in
 test_bad_keys
    self.klass(bad_key)
    ~~~~~~~~~~^^^^^^^^^
  File "C:\victor\python\main\Lib\zoneinfo\_common.py", line 12, in load_tzdata     
    return resources.files(package_name).joinpath(resource_name).open("rb")
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "C:\victor\python\main\Lib\pathlib\__init__.py", line 777, in open
    return io.open(self, mode, buffering, encoding, errors, newline)
           ~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
PermissionError: [Errno 13] Permission denied: 'C:\\victor\\python\\main\\env\\Lib\\site-packages\\tzdata\\zoneinfo\\Europe'
...

test_zoneinfo.test_bad_keys() pass with this fix (if tzdata is installed).

vstinner@WIN C:\victor\python\main>env\scripts\python -m test test_zoneinfo -m test_bad_keys -v
...
Result: SUCCESS

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cc @StanFromIreland

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StanFromIreland approved these changes Jun 30, 2025
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LGTM

Test fail is unrelated, and there is no need to add another test since this is covered by existing ones as you noted. Though I would not mind if there was a comment explaining why this is done. e.g.

# Workaround for Windows, see gh-85702

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Though I would not mind if there was a comment explaining why this is done.

I added a comment.

ZeroIntensity
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I think there should be a test for this on Windows.

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@ZeroIntensity

There already was, see Victor's comment: #136117 (comment)

So I assume we have no CI/Buildbots with tzdata installed.

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Yeah, I know, intuition is telling me that we don't want tests that incidentally catch a bug. But I didn't realize that there aren't buildbots with tzdata installed, so I guess it's a moot point.

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Update Misc/NEWS.d/next/Library/2025-06-30-11-12-24.gh-issue-85702.0L…
5ebcb82 
…rbwu.rst

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
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I think there should be a test for this on Windows.

There is already test_zoneinfo.test_bad_keys().

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LGTM as well. Looking at the test, it does seem to be exercising exactly what I'd wanted. We should probably try to get tzdata installed on one of the Windows buildbots.

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I hope I get a definitive reply to my question on the Discord... I can install it on mine but I will probably have to drop it to unstable.

@vstinner vstinner merged commit ee47670 into python:main Jun 30, 2025
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@vstinner vstinner deleted the zoneinfo_is_dir branch June 30, 2025 14:33
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Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Jun 30, 2025
@vstinner @ZeroIntensity @miss-islington
pythongh-85702: Catch PermissionError in zoneinfo.load_tzdata() (pyth…
5304d9a 
…onGH-136117)

(cherry picked from commit ee47670)

Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
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Sorry, @vstinner, I could not cleanly backport this to 3.13 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker ee47670e8b8648b14fd4cb64a9d47d6ed3c5b6b7 3.13

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bedevere-app bot commented Jun 30, 2025

GH-136128 is a backport of this pull request to the 3.14 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.14 bugs and security fixes label Jun 30, 2025
vstinner added a commit that referenced this pull request Jun 30, 2025
@miss-islington @vstinner @ZeroIntensity
[3.14] gh-85702: Catch PermissionError in zoneinfo.load_tzdata() (GH-…
e86ac72 
…136117) (#136128)

gh-85702: Catch PermissionError in zoneinfo.load_tzdata() (GH-136117)
(cherry picked from commit ee47670)

Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
@vstinner vstinner removed the needs backport to 3.13 bugs and security fixes label Jun 30, 2025
@vstinner vstinner added the needs backport to 3.13 bugs and security fixes label Jun 30, 2025
@miss-islington-app
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Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Jun 30, 2025
@vstinner @ZeroIntensity @miss-islington
pythongh-85702: Catch PermissionError in zoneinfo.load_tzdata() (pyth…
15686ee 
…onGH-136117)

(cherry picked from commit ee47670)

Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
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bedevere-app bot commented Jun 30, 2025

GH-136136 is a backport of this pull request to the 3.13 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.13 bugs and security fixes label Jun 30, 2025
vstinner added a commit that referenced this pull request Jun 30, 2025
@miss-islington @vstinner @ZeroIntensity
[3.13] gh-85702: Catch PermissionError in zoneinfo.load_tzdata() (GH-…
e194793 
…136117) (#136136)

gh-85702: Catch PermissionError in zoneinfo.load_tzdata() (GH-136117)
(cherry picked from commit ee47670)

Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
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