🛡️ Sentinel: [MEDIUM] Fix process execution deadlock vulnerability

[acebytes]

🚨 Severity: MEDIUM
💡 Vulnerability: A process execution deadlock pattern exists where pipe.fileHandleForReading.readDataToEndOfFile() is called after process.waitUntilExit(), or when standard output is read inside a terminationHandler. If the pipe's buffer fills, the child process blocks on write(), while the parent is blocked on waitUntilExit() or waiting for the terminationHandler, creating a deadlock.
🎯 Impact: May cause the application to hang when running specific external processes such as docker or tmutil, denying service for cleanup or pruning.
🔧 Fix: Refactored to read pipes before waitUntilExit() or asynchronously to avoid deadlock.
✅ Verification: Ensured code properly reads from pipe before waiting for exit.

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PR created automatically by Jules for task 1447749825474074092 started by @acebytes

[google-labs-jules]

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[acebytes]

Duplicate — splits into two canonicals: #236 (CacheoutViewModel runCleanCommand swap) and #227 (Tier2 SnapshotCleanup readGroup pattern). #227's approach (start readers before process.run(), wait on readGroup in terminationHandler) is cleaner than the inline DispatchQueue rewrite here.

[google-labs-jules]

Duplicate — splits into two canonicals: #236 (CacheoutViewModel runCleanCommand swap) and #227 (Tier2 SnapshotCleanup readGroup pattern). #227's approach (start readers before process.run(), wait on readGroup in terminationHandler) is cleaner than the inline DispatchQueue rewrite here.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.