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Race condition: collection error when directory is deleted before scandir() runs #13083

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Zac-HD opened this issue Dec 24, 2024 · 0 comments · May be fixed by #13084 or #13086
Open

Race condition: collection error when directory is deleted before scandir() runs #13083

Zac-HD opened this issue Dec 24, 2024 · 0 comments · May be fixed by #13084 or #13086
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good first issue easy issue that is friendly to new contributor type: bug problem that needs to be addressed

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@Zac-HD
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Zac-HD commented Dec 24, 2024

Our scandir() function crashes if the directory to scan does not exist, which can happen if e.g. a tempory directory is deleted during collection (as in HypothesisWorks/hypothesis#4200). I therefore propose catching the directory-not-found error and returning [] in this case:

try:
    with os.scandir(path) as s:
        scanned = list(s)
except FileNotFoundError:
    return []
# Skip entries with symlink loops and other brokenness, so the caller
# doesn't have to deal with it.
for entry in scanned:
    ...
@Zac-HD Zac-HD added type: bug problem that needs to be addressed good first issue easy issue that is friendly to new contributor labels Dec 24, 2024
@aday2418 aday2418 linked a pull request Dec 24, 2024 that will close this issue
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@delta87 delta87 mentioned this issue Dec 25, 2024
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delta87 added a commit to delta87/pytest that referenced this issue Dec 26, 2024
@delta87
Fix scandir() crash by returning [] when directory is not found (pyte…
6156675 
…st-dev#13083)
@delta87 delta87 linked a pull request Dec 26, 2024 that will close this issue
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@Zac-HD