Distillation

🔴 (00:29) Upgrade path normalization strips a trailing path separator, but never strips it from a bare filesystem root such as /.
🔴 (00:29) Upgrade-source resolution returns the successful probe response to the caller so the caller never repeats the successful probe request.
🔴 (00:29) When every CLI upgrade source responds with HTTP 404, source resolution throws the exact message No CLI upgrade source was found: every source returned HTTP 404.
🔴 (00:29) Upgrade networking maps TLS-related failures to UpgradeError("network_error", buildTlsErrorDetail(error)).
🔴 (00:29) Binary naming follows sentry-${os}-${arch}${libcSuffix}${suffix} and Linux libc detection invokes spawnSync("ldd", ["--version"], ...).
🔴 (00:29) Derived installation paths include lockPath: \${installPath}.lock`; install-directory selection can return xdgBinHome` and also accounts for legacy install subdirectories relative to the user’s home that predate XDG.
🔴 (00:29) acquireLock(lockPath: string): void handles a stale lock from a dead process by removing it and retrying.
🔴 (00:29) Binary replacement is intentionally synchronous because it performs a multi-step rename sequence with platform-specific behavior, including Windows .old renaming and Unix atomic replacement, while accounting for concurrency.
🔴 (00:29) Upgrade installation acquires lockPath before replacement, logs logger.debug("realpath failed, falling back to resolve()", error) when realpath fails, and can copy via await copyFile(sourcePath, tempPath).
🔴 (00:29) A grandfathered silent catch is marked with biome-ignore lint/plugin and references issue #1531; the stated remediation is to add log.debug()/log.warn() or rethrow.

Distillation

Observations