Retry transient executable permission errors - #4997
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August 5, 2026 02:03
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Fixes #4648.
Self-update can occasionally fail while making the downloaded
rustup-initexecutable when another process temporarily makes the file unavailable. This change retries transientNotFound,PermissionDenied, andResourceBusyerrors using a short Fibonacci backoff with jitter, while still returning non-transient errors immediately.A unit test covers recovery after transient permission-setting failures.
Testing
cargo fmt --all -- --checkcargo test --features=test retry_set_permissions_after_transient_errorscargo clippy --all --all-targets --all-features -- -D warnings