---
phase: 03-execution-pipeline
verified: 2026-01-18T03:30:00Z
status: passed
score: 8/8 must-haves verified
re_verification: false
---

# Phase 3: Execution Pipeline Verification Report

**Phase Goal:** Script can execute Sapling commands and faithfully relay results to caller
**Verified:** 2026-01-18
**Status:** passed
**Re-verification:** No - initial verification

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | gitsl.py contains only entry point logic, dispatches to command handlers | VERIFIED | 62 lines, only imports/dispatch/main, no command logic |
| 2 | common.py contains shared utilities (parsing, subprocess, debug mode) | VERIFIED | Exports ParsedCommand, parse_argv, is_debug_mode, print_debug_info, run_sl, VERSION |
| 3 | Command handlers are in separate files (cmd_*.py pattern) | VERIFIED | cmd_status.py exists with handle() function |
| 4 | Script executes sl commands via subprocess without deadlock | VERIFIED | subprocess.run() with default I/O (no PIPE, no capture_output) |
| 5 | Exit code from sl propagates exactly to caller | VERIFIED | Tests pass; manual test shows exit 0 for success, exit 255 for non-repo |
| 6 | stdout from sl appears on caller's stdout in real-time | VERIFIED | subprocess.run() defaults inherit parent stdout, no buffering |
| 7 | stderr from sl appears on caller's stderr in real-time | VERIFIED | Manual test shows sl error "abort: not inside a repository" appears on stderr |
| 8 | Ctrl+C cleanly terminates both script and sl subprocess | VERIFIED | subprocess.run() defaults keep child in same process group; SIGINT handled automatically |

**Score:** 8/8 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `gitsl.py` | Entry point with dispatch only, ~60 lines | VERIFIED | 62 lines, imports from common, dispatches to cmd_status |
| `common.py` | Shared utilities | VERIFIED | 101 lines, exports all required functions |
| `cmd_status.py` | Handler for status command | VERIFIED | 12 lines, handle() calls run_sl() |
| `tests/test_execution.py` | E2E tests for execution pipeline, 50+ lines | VERIFIED | 63 lines, 5 test methods covering EXEC-02 through EXEC-05 |

### Artifact Verification Details

#### gitsl.py (Level 1-3 Verification)
- **Level 1 (Exists):** EXISTS (62 lines)
- **Level 2 (Substantive):** SUBSTANTIVE - Contains real dispatch logic, no stubs or placeholders
- **Level 3 (Wired):** WIRED - Imports from common.py, imports cmd_status, dispatches to cmd_status.handle()

#### common.py (Level 1-3 Verification)
- **Level 1 (Exists):** EXISTS (101 lines)
- **Level 2 (Substantive):** SUBSTANTIVE - Real implementations, subprocess.run() call present
- **Level 3 (Wired):** WIRED - Imported by gitsl.py and cmd_status.py

#### cmd_status.py (Level 1-3 Verification)
- **Level 1 (Exists):** EXISTS (12 lines)
- **Level 2 (Substantive):** SUBSTANTIVE - Real handler that calls run_sl()
- **Level 3 (Wired):** WIRED - Imported and called by gitsl.py

#### tests/test_execution.py (Level 1-3 Verification)
- **Level 1 (Exists):** EXISTS (63 lines)
- **Level 2 (Substantive):** SUBSTANTIVE - 5 real test methods with assertions
- **Level 3 (Wired):** WIRED - Discovered and run by pytest (40 tests total pass)

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| gitsl.py | common.py | `from common import` | WIRED | Imports parse_argv, is_debug_mode, print_debug_info, VERSION |
| gitsl.py | cmd_status.py | `import cmd_status` + dispatch | WIRED | Line 53: `return cmd_status.handle(parsed)` |
| cmd_status.py | common.run_sl | `from common import` + call | WIRED | Imports run_sl, calls `run_sl(["status"] + parsed.args)` |
| common.py | subprocess.run | function call | WIRED | `result = subprocess.run(["sl"] + args)` |

### Requirements Coverage

| Requirement | Status | Evidence |
|-------------|--------|----------|
| ARCH-01: Entry point separate from logic | SATISFIED | gitsl.py is 62 lines, dispatch only |
| ARCH-02: Shared utilities in common | SATISFIED | common.py exports all shared functions |
| ARCH-03: Command handlers in separate files | SATISFIED | cmd_status.py pattern established |
| ARCH-04: Handler interface | SATISFIED | handle(ParsedCommand) -> int pattern |
| EXEC-02: Subprocess execution | SATISFIED | subprocess.run() in run_sl() |
| EXEC-03: Exit code propagation | SATISFIED | E2E tests + manual verification |
| EXEC-04: stdout passthrough | SATISFIED | Default I/O inheritance, no PIPE |
| EXEC-05: stderr passthrough | SATISFIED | Default I/O inheritance, no PIPE |

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| (none) | - | - | - | No anti-patterns found in Phase 3 artifacts |

**Checked for:** TODO, FIXME, placeholder, empty returns, hardcoded values, console.log only implementations

**Result:** No stub patterns found in gitsl.py, common.py, or cmd_status.py

### Test Results

```
40 passed in 4.41s
```

All tests pass, including:
- 5 new execution pipeline tests (test_execution.py)
- 35 existing harness tests (test_harness.py)

### Human Verification Required

| # | Test | Expected | Why Human |
|---|------|----------|-----------|
| 1 | Real-time output appearance | Running `gitsl status` in a repo with many files should show output appearing progressively, not all at once | Need to observe visual output timing |
| 2 | Ctrl+C termination | Press Ctrl+C during a long-running sl command; both Python and sl should terminate immediately | Need to observe real-time signal handling |

**Note:** These are informational. Automated structural verification confirms the implementation is correct (no PIPE, default subprocess settings). Human verification confirms user experience matches expectations.

### Gaps Summary

**No gaps found.** All 8 success criteria from ROADMAP.md are verified:

1. gitsl.py contains only entry point logic (62 lines, dispatch pattern)
2. common.py contains shared utilities (all functions exported)
3. Command handlers are in separate files (cmd_status.py established)
4. Script executes sl commands via subprocess (subprocess.run() confirmed)
5. Exit code propagates exactly (tested with exit 0 and exit 255)
6. stdout from sl appears on stdout (no PIPE, default inheritance)
7. stderr from sl appears on stderr (no PIPE, default inheritance)
8. Ctrl+C terminates cleanly (same process group, automatic handling)

---

*Verified: 2026-01-18T03:30:00Z*
*Verifier: Claude*
