allenai / allenai/cached_path

Caching a single file in a tar/zip should not extract all files

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Feature request
Lingua principale
Python
Stelle
47
Fork
22
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Descrizione

**Is your feature request related to a problem? Please describe.**
When extracting a single file from a tar/zip archive, currently all files in the archive are extracted using the `tarfile.extractall` function even though only a single file was requested. This leads to bloated cache directories containing unnecessary files. Note below, I only request `dummy.txt` but I also get `folder`:

```python
>>> import cached_path
>>> path = "https://github.com/allenai/cached_path/raw/refs/heads/main/test_fixtures/utf-8_sample/archives/utf-8.tar.gz!dummy.txt"
>>> f = cached_path.cached_path(path, extract_archive=True, quiet=True)
>>> [x.name for x in f.parent.iterdir()]
['dummy.txt', 'folder']
```

**Describe the solution you'd like**
Extract only the file requested using the `tarfile.extract` function rather than the `tarfile.extractall` function.

**Describe alternatives you've considered**
None

**Additional context**
None

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