fix: eliminate TOCTOU races in catalog_fetch() - #3910
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…ath URLs Remove exists() pre-checks and catch FileNotFoundError from read_text() to provide clear BundlerError messages even under race conditions.
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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