fix: eliminate TOCTOU races in catalog_fetch() - #3910
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Pull request overview
Eliminates TOCTOU races when reading local catalogs.
Changes:
- Removes
exists()pre-checks. - Converts
FileNotFoundErrorintoBundlerError.
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| File | Description |
|---|---|
src/specify_cli/bundler/services/adapters.py |
Safely handles disappearing local catalog files. |
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mnriem
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Aug 10, 2026
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Please address Copilot feedback
…ath URLs Remove exists() pre-checks and catch FileNotFoundError from read_text() to provide clear BundlerError messages even under race conditions.
…ath URLs Remove exists() pre-checks and catch FileNotFoundError from read_text() for both file:// and bare path catalog sources. Also catches OSError/UnicodeError to preserve the decode-error wrapping contract. Add regression test for the TOCTOU fix covering both file:// URLs and bare paths: mocked Path is observable as present (exists() returns True) but read_text() raises FileNotFoundError, proving the exists() removal eliminates the race window. Co-authored-by: GitHub Copilot (model: mimo-v2.5-free, supervised)
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Problem
catalog_fetch()checksexists()then callsread_text()for bothfile://and bare path URLs. The file can be deleted between the two calls.Fix
Remove the
exists()pre-checks and catchFileNotFoundErrorfromread_text().Testing
BundlerErroris raised when catalog file is missing