TarFile.extractall() doesn't properly handle UNC paths
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Description
Bug report
Bug description:
TarFile.extractall() does not perform path normalization before calling os.lstat(). This is an issue on Windows as the resulting path ends us using Windows-style (\\) and unix-style (/) path separators. This results in the following error: OSError: [WinError 123] The filename, directory name, or volume label syntax is incorrect: '\\\\?\\Z:\\extracted\\double-conversion-v3.1.4.tar.gz\\double-conversion-3.1.4/test/cctest'.
from Lib import tarfile
with tarfile.open(r'\\?\Z:\downloads\double-conversion-v3.1.4.tar.gz') as t:
t.extractall(r'\\?\Z:\extracted\double-conversion-v3.1.4.tar.gz')
CPython versions tested on:
3.13, CPython main branch
Operating systems tested on:
Windows
Linked PRs
- gh-143665
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start in Lib/tarfile and reproduce the reported TarFile.extractall() case with the Windows UNC-style paths shown in the issue. Trace the path passed to os.lstat(); done means the example no longer raises the reported WinError on Windows.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100