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gh-82367: UseFindFirstFile Win32 API inntpath.realpath()#110298

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@moonsikpark
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@moonsikparkmoonsikpark commentedOct 3, 2023•
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ntpath.realpath() breaks out of traversing a series of paths where a (handled) ERROR_ACCESS_DENIED or ERROR_SHARING_VIOLATION occurs.

UsingFindFirstFile Win32 API, we can query their real name to correct the case and also resolve MS-DOS (also called 8.3) style file names such asC:\\LONGFI~1.TXT.

📚 Documentation preview 📚:https://cpython-previews--110298.org.readthedocs.build/

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A few documentation nits, but mostly this looks pretty good to me. It will need approval from either@zooba or@eryksun before I'd be comfortable merging it, though.

@zwarezware requested review fromeryksun andzoobaOctober 3, 2023 17:28
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The code change looks great to me. Awesome job!

With Zach's requested doc changes, I think this is good to merge.

@moonsikparkmoonsikparkforce-pushed thegh-82367-use-findfirstfile-in-nt-realpath branch from2c49ffc to4590347CompareOctober 4, 2023 11:38
moonsikpark added a commit to moonsikpark/cpython that referenced this pull requestOct 4, 2023
…ython#110298)* Use `FindFirstFile` Win32 API to fix a bug where `ntpath.realpath()`breaks out of traversing a series of paths where a (handled)`ERROR_ACCESS_DENIED` or `ERROR_SHARING_VIOLATION` occurs.* Update docs to reflect that `ntpath.realpath()` eliminates MS-DOSstyle names.
@moonsikparkmoonsikparkforce-pushed thegh-82367-use-findfirstfile-in-nt-realpath branch from4590347 tof675a4fCompareOctober 4, 2023 11:50
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ghost commentedOct 4, 2023•
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moonsikpark added a commit to moonsikpark/cpython that referenced this pull requestOct 4, 2023
…ython#110298)* Use `FindFirstFile` Win32 API to fix a bug where `ntpath.realpath()`breaks out of traversing a series of paths where a (handled)`ERROR_ACCESS_DENIED` or `ERROR_SHARING_VIOLATION` occurs.* Update docs to reflect that `ntpath.realpath()` eliminates MS-DOSstyle names.
@moonsikparkmoonsikparkforce-pushed thegh-82367-use-findfirstfile-in-nt-realpath branch fromd88c757 toe17852cCompareOctober 4, 2023 14:41
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LGTM. Thank you, Moonsik, and thanks also for taking the extra time to make the test more robust.

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…ython#110298)* Use `FindFirstFile` Win32 API to fix a bug where `ntpath.realpath()`breaks out of traversing a series of paths where a (handled)`ERROR_ACCESS_DENIED` or `ERROR_SHARING_VIOLATION` occurs.* Update docs to reflect that `ntpath.realpath()` eliminates MS-DOSstyle names.
@moonsikparkmoonsikparkforce-pushed thegh-82367-use-findfirstfile-in-nt-realpath branch from1766bc3 to2b5a29eCompareOctober 5, 2023 08:38
@zwarezware merged commitd33aa18 intopython:mainOct 5, 2023
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Thanks Steve and Eryk for the reviews, and Moonsik for the patch and excellent collaboration!

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@moonsikparkmoonsikpark deleted the gh-82367-use-findfirstfile-in-nt-realpath branchOctober 5, 2023 17:10
@moonsikparkmoonsikpark restored the gh-82367-use-findfirstfile-in-nt-realpath branchOctober 6, 2023 02:17
@moonsikparkmoonsikpark deleted the gh-82367-use-findfirstfile-in-nt-realpath branchOctober 6, 2023 02:20
Glyphack pushed a commit to Glyphack/cpython that referenced this pull requestSep 2, 2024
…ythonGH-110298)* Use `FindFirstFile` Win32 API to fix a bug where `ntpath.realpath()`breaks out of traversing a series of paths where a (handled)`ERROR_ACCESS_DENIED` or `ERROR_SHARING_VIOLATION` occurs.* Update docs to reflect that `ntpath.realpath()` eliminates MS-DOSstyle names.
encukou added a commit to encukou/cpython that referenced this pull requestJun 3, 2025
The test was added inpythongh-110298, with a fix that was never backportedto 3.12 and below.It was most likely skipped in the GHA run.
ambv pushed a commit that referenced this pull requestJun 3, 2025
The test was added ingh-110298, with a fix that was never backportedto 3.12 and below.It was most likely skipped in the GHA run.
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@zwarezwarezware left review comments

@eryksuneryksuneryksun approved these changes

@zoobazoobaAwaiting requested review from zooba

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