# Cleanup Implementation Verification (bf-2w7)

## Task
Always tear down temp dir + stop.fifo on every exit path; sweep orphans on startup

## Implementation Status: COMPLETE

All cleanup mechanisms were already properly implemented in the codebase.

## Exit Paths Covered

### 1. Normal Exit (Success)
- **Location**: `main.rs:189`
- **Mechanism**: Calls `exit_with_cleanup(0)` → `cleanup_temp_dir()`
- **Coverage**: ✓ Cleanups before `process::exit(0)`

### 2. Normal Exit (Error)
- **Location**: Various paths in `main.rs`
- **Mechanism**: Calls `exit_with_cleanup(2-4)` → `cleanup_temp_dir()`
- **Coverage**: ✓ Cleanups before `process::exit()`

### 3. Timeout Exit
- **Location**: `main.rs:211`
- **Mechanism**: Calls `exit_with_cleanup(124)` → `cleanup_temp_dir()`
- **Coverage**: ✓ Cleanups watchdog timeout exits

### 4. Signal Interruption (SIGINT/SIGTERM)
- **Location**: `main.rs:200`
- **Mechanism**: Calls `exit_with_cleanup(130)` → `cleanup_temp_dir()`
- **Coverage**: ✓ Cleanups after signal handling

### 5. Watchdog Timeout
- **Location**: `watchdog.rs:286-299`
- **Mechanism**: Watchdog kills child → returns `Error::Timeout` → `exit_with_cleanup()`
- **Coverage**: ✓ Ensures cleanup on watchdog timeout

### 6. Panic During Session
- **Location**: `session.rs:114`
- **Mechanism**: `catch_unwind` ensures `CleanupGuard::drop` runs
- **Coverage**: ✓ Cleanup even on panic

### 7. Early Returns
- **Location**: Throughout `session.rs`
- **Mechanism**: `CleanupGuard` drops on early return
- **Coverage**: ✓ Cleanup on early exit paths

## Cleanup Mechanisms

### 1. Orphan Cleanup on Startup
- **Function**: `hook.rs:17` - `cleanup_orphans()`
- **Called from**: `main.rs:39`
- **Behavior**: 
  - Sweeps system temp directory for `claude-print-*` patterns
  - Removes directories older than 10 minutes (600 seconds)
  - Removes FIFO first, then entire directory
- **Coverage**: ✓ Prevents accumulation of orphans from crashes

### 2. CleanupGuard (Drop-based cleanup)
- **Location**: `session.rs:43-49`
- **Behavior**: 
  - Calls `installer.cleanup()` on drop
  - Covers all paths where guard goes out of scope
  - Idempotent via atomic flag
- **Coverage**: ✓ Automatic cleanup via RAII

### 3. Global Cleanup Before Exit
- **Function**: `session.rs:55` - `cleanup_temp_dir()`
- **Called from**: `main.rs:31` via `exit_with_cleanup()`
- **Behavior**:
  - Removes FIFO first (may have different permissions)
  - Removes entire temp directory with retry logic (3 attempts)
  - Handles process::exit() bypassing destructors
- **Coverage**: ✓ Explicit cleanup before exit

### 4. Idempotent Cleanup
- **Location**: `hook.rs:116-146`
- **Mechanism**: Atomic flag `cleanup_performed`
- **Behavior**:
  - Prevents double-free with atomic swap
  - Safe to call multiple times
  - Explicit FIFO removal before directory
  - Retry logic for transient failures (3 attempts)
- **Coverage**: ✓ Safe cleanup even if called multiple times

## Verification

### Tests Passing
- ✓ `cleanup_explicitly_removes_fifo`
- ✓ `cleanup_can_be_called_multiple_times`
- ✓ `cleanup_orphans_does_not_panic`
- ✓ `temp_dir_cleaned_up_on_drop`

### No Orphaned Directories Found
```bash
$ ls -la /tmp/claude-print-* 2>/dev/null
(no output - all cleaned up)
```

## Architecture

The cleanup strategy uses **defense in depth**:

1. **Startup sweep**: Removes old orphans from previous crashes
2. **RAII guard**: Automatic cleanup via Drop trait
3. **Explicit cleanup**: Manual cleanup before process::exit()
4. **Idempotency**: Safe to call cleanup multiple times
5. **Retry logic**: Handles transient filesystem issues

This ensures temp directories and FIFOs are removed on **all exit paths**:
- Normal exit (success)
- Normal exit (error)
- Timeout (watchdog)
- Signal interruption (SIGINT/SIGTERM)
- Panic
- Early returns

## Conclusion

The implementation is complete and verified. All exit paths properly tear down temporary resources, and orphan cleanup runs on startup to prevent accumulation from crashed runs.