88faf1443d
Verify and document that all exit paths are covered: - Orphan cleanup on startup via cleanup_orphans() - RAII CleanupGuard ensures cleanup on drop - Global cleanup_temp_dir() before process::exit() - Atexit handler registration for external signals - Signal handling for SIGINT/SIGTERM - HookInstaller cleanup with idempotent flag - Panic safety with catch_unwind All 90 library tests + 28 integration tests pass. Exit path matrix shows all scenarios covered with defense in depth. Co-Authored-By: Claude <noreply@anthropic.com>
100 lines
4.7 KiB
Markdown
100 lines
4.7 KiB
Markdown
# BF-2W7: Cleanup Implementation Summary
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## Task
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Always tear down temp dir + stop.fifo on every exit path; sweep orphans on startup.
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## Implementation Status: ✅ COMPLETE
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All requirements have been implemented and tested:
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### 1. Orphan Cleanup on Startup ✅
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- **Function**: `hook::cleanup_orphans()` in `src/hook.rs:9-57`
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- **Called**: `main.rs:43` - early in main(), before any session runs
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- **Behavior**: Sweeps `/tmp/claude-print-*` directories older than 60 seconds, removes FIFO first then entire directory
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### 2. CleanupGuard RAII Pattern ✅
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- **Struct**: `CleanupGuard<'a>` in `src/session.rs:47-53`
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- **Drop Implementation**: Calls `installer.cleanup()` when guard is dropped
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- **Coverage**: All exit paths where guard goes out of scope (success, error, timeout, signal, panic)
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### 3. Global Cleanup Before process::exit() ✅
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- **Function**: `session::cleanup_temp_dir()` in `src/session.rs:60-98`
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- **Wrapper**: `exit_with_cleanup()` in `main.rs:30-33`
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- **Behavior**: Idempotent via atomic swap, removes FIFO first, retry logic (3 attempts, 10ms delays)
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- **Called**: Before every `process::exit()` call in all exit paths
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### 4. Atexit Handler Registration ✅
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- **Function**: `session::register_cleanup_handler()` in `src/session.rs:106-115`
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- **Called**: `main.rs:38` - very early in startup
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- **Behavior**: Registers `libc::atexit()` handler to call `cleanup_temp_dir()` even if Rust's default signal handler triggers
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### 5. Signal Handling (SIGINT/SIGTERM) ✅
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- **Handlers**: `sigint_handler` and `sigterm_handler` in `src/session.rs:464-486`
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- **Mechanism**: Write to self-pipe → event loop returns `ExitReason::Interrupted` → `CleanupGuard` drops
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- **SignalGuard**: Restores default handlers on drop
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### 6. HookInstaller Cleanup Method ✅
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- **Function**: `HookInstaller::cleanup()` in `src/hook.rs:122-163`
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- **Behavior**: Idempotent via `Arc<AtomicBool>`, removes FIFO first, retry logic for directory removal
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- **Called**: Automatically by `CleanupGuard::drop`
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### 7. Panic Safety ✅
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- **Implementation**: `std::panic::catch_unwind` in `Session::run()` (session.rs:154-173)
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- **Behavior**: Panic caught → `CleanupGuard` drops → cleanup runs
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## Test Coverage
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All tests pass:
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- ✅ 90 library tests (including `cleanup_can_be_called_multiple_times`, `cleanup_orphans_does_not_panic`)
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- ✅ 28 integration tests (including `invariant_temp_dir_drop_removes_all_artifacts`)
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## Exit Path Coverage Matrix
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| Exit Path | Cleanup Mechanism | Status |
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|-----------|-------------------|--------|
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| Normal exit | `exit_with_cleanup()` + `CleanupGuard::drop` | ✅ |
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| Error exit | `exit_with_cleanup()` + `CleanupGuard::drop` | ✅ |
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| Watchdog timeout | Self-pipe → Event loop exit → `CleanupGuard::drop` | ✅ |
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| SIGTERM | Signal handler → self-pipe → `Interrupted` → `CleanupGuard::drop` | ✅ |
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| SIGINT | Signal handler → self-pipe → `Interrupted` → `CleanupGuard::drop` | ✅ |
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| Panic | `catch_unwind` → `CleanupGuard::drop` | ✅ |
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| Orphan cleanup on startup | `cleanup_orphans()` | ✅ |
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## Implementation Details
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### FIFO Removal Strategy
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The FIFO (named pipe) is removed **before** the directory because:
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1. FIFOs have different permissions that can block directory removal
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2. Must be explicitly removed (not part of normal directory tree)
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3. Retry logic handles transient errors
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### Retry Logic
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Both `cleanup_temp_dir()` and `HookInstaller::cleanup()` use retry logic:
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- 3 attempts with 5-10ms delays between attempts
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- Prevents failures due to temporary file locks or access delays
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### Idempotency
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Both cleanup mechanisms are idempotent:
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- `cleanup_temp_dir()` uses `AtomicBool::swap` to prevent double cleanup
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- `HookInstaller::cleanup()` uses `Arc<AtomicBool>` flag
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- Safe to call multiple times without side effects
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## Conclusion
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The implementation provides **defense in depth** with multiple redundant cleanup mechanisms:
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1. RAII `CleanupGuard` (always runs when `Session::run_inner` returns)
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2. Global `TEMP_DIR_PATH` with `cleanup_temp_dir()` (for `process::exit` paths)
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3. `HookInstaller::cleanup()` with idempotent flag and retry logic
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4. Atexit handler for external signal cases
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5. Startup orphan sweeping to prevent accumulation
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All exit paths are covered, ensuring no orphaned temp directories or FIFOs remain after any termination scenario.
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## Files Modified
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- `src/hook.rs`: Added `cleanup_orphans()` function and enhanced `HookInstaller::cleanup()`
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- `src/session.rs`: Added `CleanupGuard`, `cleanup_temp_dir()`, `register_cleanup_handler()`
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- `src/main.rs`: Added `exit_with_cleanup()` wrapper, registered cleanup handlers, called `cleanup_orphans()`
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- `tests/`: Integration tests verify cleanup behavior
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## Verification
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Run: `cargo test` - All 90 library tests + 28 integration tests pass
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