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GeezerVison is showing github.com — gh-102475: Fix os.path.realpath() for names which look like a drive by serhiy-storchaka · Pull Request #155399 · python/cpython

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@serhiy-storchaka

@serhiy-storchaka serhiy-storchaka commented Aug 8, 2026

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The documentation says that in the non-strict mode the unresolved part of the path is appended, but it was joined with join(), which resets the path if the tail looks like a drive:

>>> ntpath.realpath('C:/spam/a:b')
'a:b'

It is now simply appended, using the naive join suggested by @eryksun.

realpath() also used join(cwd, path) for a relative path, which left a path relative to another drive unresolved. It now uses abspath(), so such path is resolved against the root directory of that drive, as GetFullPathNameW() does:

>>> ntpath.realpath('Z:spam')   # Z: does not exist
'Z:spam'                        # now 'Z:\\spam'
  • Issue: ntpath.realpath() mishandles filenames that resemble drives #102475

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@serhiy-storchaka
pythongh-102475: Fix os.path.realpath() for names which look like a d…
7b22c4c
…rive

The unresolved part of the path was joined with the resolved part using
join(), so a component containing a colon (e.g. "spam:eggs") reset the path.
It is now simply appended.

A path relative to a drive which does not exist (e.g. "Z:spam") is now
resolved against the root directory of that drive, as the Windows path
normalization does.
@bedevere-app bedevere-app Bot mentioned this pull request Aug 8, 2026
ntpath.realpath() mishandles filenames that resemble drives #102475
Closed
@bedevere-app bedevere-app Bot added the awaiting core review label Aug 8, 2026
@serhiy-storchaka serhiy-storchaka added needs backport to 3.13 only security fixes needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Aug 8, 2026
@serhiy-storchaka
serhiy-storchaka requested review from eryksun and zooba August 8, 2026 20:17
@serhiy-storchaka
serhiy-storchaka merged commit 0c38e05 into python:main Aug 29, 2026
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@serhiy-storchaka
serhiy-storchaka deleted the gh-102475-realpath-join branch August 29, 2026 18:17
@miss-islington-app

miss-islington-app Bot commented Aug 29, 2026

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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

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@bedevere-app bedevere-app Bot removed the awaiting core review label Aug 29, 2026
@bedevere-app

bedevere-app Bot commented Aug 29, 2026

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GH-156593 is a backport of this pull request to the 3.15 branch.

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@bedevere-app bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Aug 29, 2026
@bedevere-app

bedevere-app Bot commented Aug 29, 2026

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GH-156594 is a backport of this pull request to the 3.14 branch.

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@bedevere-app bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Aug 29, 2026
@bedevere-app

bedevere-app Bot commented Aug 29, 2026

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GH-156595 is a backport of this pull request to the 3.13 branch.

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@bedevere-app bedevere-app Bot removed the needs backport to 3.13 only security fixes label Aug 29, 2026
serhiy-storchaka added a commit that referenced this pull request Aug 29, 2026
@miss-islington @serhiy-storchaka
[3.13] gh-102475: Fix os.path.realpath() for names which look like a …
34573c1
…drive (GH-155399) (GH-156595)

The unresolved part of the path was joined with the resolved part using
join(), so a component containing a colon (e.g. "spam:eggs") reset the path.
It is now simply appended.

A path relative to a drive which does not exist (e.g. "Z:spam") is now
resolved against the root directory of that drive, as the Windows path
normalization does.
(cherry picked from commit 0c38e05)

Co-authored-by: Serhiy Storchaka <[email protected]>
serhiy-storchaka added a commit that referenced this pull request Aug 29, 2026
@miss-islington @serhiy-storchaka
[3.14] gh-102475: Fix os.path.realpath() for names which look like a …
162c47c
…drive (GH-155399) (GH-156594)

The unresolved part of the path was joined with the resolved part using
join(), so a component containing a colon (e.g. "spam:eggs") reset the path.
It is now simply appended.

A path relative to a drive which does not exist (e.g. "Z:spam") is now
resolved against the root directory of that drive, as the Windows path
normalization does.
(cherry picked from commit 0c38e05)

Co-authored-by: Serhiy Storchaka <[email protected]>
clin1234 pushed a commit to clin1234/cpython that referenced this pull request Sep 12, 2026
@serhiy-storchaka @clin1234
pythongh-102475: Fix os.path.realpath() for names which look like a d…
3b3db2b
…rive (pythonGH-155399)

The unresolved part of the path was joined with the resolved part using
join(), so a component containing a colon (e.g. "spam:eggs") reset the path.
It is now simply appended.

A path relative to a drive which does not exist (e.g. "Z:spam") is now
resolved against the root directory of that drive, as the Windows path
normalization does.
serhiy-storchaka added a commit that referenced this pull request Oct 10, 2026
@miss-islington @serhiy-storchaka
[3.15] gh-102475: Fix os.path.realpath() for names which look like a …
6531b40
…drive (GH-155399) (GH-156593)

The unresolved part of the path was joined with the resolved part using
join(), so a component containing a colon (e.g. "spam:eggs") reset the path.
It is now simply appended.

A path relative to a drive which does not exist (e.g. "Z:spam") is now
resolved against the root directory of that drive, as the Windows path
normalization does.
(cherry picked from commit 0c38e05)

Co-authored-by: Serhiy Storchaka <[email protected]>
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@eryksun eryksun Awaiting requested review from eryksun
@zooba zooba Awaiting requested review from zooba

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@serhiy-storchaka
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