---
phase: 05-artifact-pipeline
verified: 2026-03-23T22:46:30Z
status: passed
score: 12/12 must-haves verified
re_verification: false
---

# Phase 5: Artifact Pipeline Verification Report

**Phase Goal:** Implement the full artifact pipeline — register, list, diff, sync, and install build artifacts on cluster nodes.
**Verified:** 2026-03-23T22:46:30Z
**Status:** ✅ passed
**Re-verification:** No — initial verification

---

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | Agent can register a local build tree and receive a content-addressed artifact_id | ✓ VERIFIED | `ArtifactRegistry.register()` calls `hash_tree()` (sha256 of tree), returns `BuildArtifact` with `artifact_id`; `artifact_register` MCP tool wired |
| 2 | Agent can list all registered artifacts with hash, source path, and timestamp | ✓ VERIFIED | `ArtifactRegistry.list_artifacts()` returns `list[BuildArtifact]`; `artifact_list` MCP tool wired |
| 3 | Agent can diff two artifacts to see which .ko files and binaries changed | ✓ VERIFIED | `ArtifactRegistry.diff()` re-hashes source trees, returns `ArtifactDiff(changed_modules, changed_bins, git_log)`; `artifact_diff` MCP tool wired |
| 4 | Registering the same tree twice returns the same artifact_id (dedup) | ✓ VERIFIED | `register()` checks `if artifact_id in self._registry` and returns existing record; `test_register_dedup_same_tree` passes |
| 5 | Registry survives process restart (persisted to disk) | ✓ VERIFIED | `save()` uses atomic `os.replace(tmp, path)`; `load()` reads from disk on init; `test_save_atomic_write` + `test_load_reads_existing_registry` pass |
| 6 | Agent can sync a registered artifact to cluster nodes via rsync | ✓ VERIFIED | `ArtifactSyncer.sync_node()` calls `asyncio.create_subprocess_exec("rsync", ...)` with `-avz --delete`; `artifact_sync` MCP tool wired |
| 7 | Nodes where the artifact hash already matches are skipped (dedup) | ✓ VERIFIED | `sync_node()` runs `test -d {dest_path}/{artifact_id}` via SSH; returns `SyncNodeResult(skipped=True)` on exit_code==0 when `force=False` |
| 8 | Per-node sync failures do not abort other nodes (best-effort) | ✓ VERIFIED | `sync_all()` uses `asyncio.gather(*tasks, return_exceptions=True)`; exceptions produce `rsync_exit_code=-1` without aborting; `test_sync_all_per_node_failure_does_not_abort_others` passes |
| 9 | Agent can install a synced artifact on nodes using modprobe_path mode | ✓ VERIFIED | `ArtifactInstaller._install_modprobe_path()` creates `/lib/modules/{kver}/extra/vmcluster/`, copies `.ko` files, runs `depmod -a`; `artifact_install` MCP tool wired |
| 10 | Agent can install using make_install, rpm, or deb modes | ✓ VERIFIED | `_install_make()`, `_install_rpm()`, `_install_deb()` all implemented; `_VALID_INSTALL_MODES` set enforces valid values; all mode tests pass |
| 11 | Per-node install failures do not abort other nodes (best-effort) | ✓ VERIFIED | `install_all()` uses `asyncio.gather(*tasks, return_exceptions=True)`; exceptions produce `exit_code=-1`; `test_install_all_per_node_failure_does_not_abort_others` passes |
| 12 | InstallStatus contains per-node exit_code, installed_module_paths, depmod_output | ✓ VERIFIED | `InstallNodeResult` model has all three fields; `InstallStatus.per_node` is `dict[str, InstallNodeResult]` |

**Score:** 12/12 truths verified

---

### Required Artifacts

| Artifact | Expected | Lines | Status | Details |
|----------|----------|-------|--------|---------|
| `vmcluster_mcp/models.py` | `ArtifactDiff` model | 213 | ✓ VERIFIED | `class ArtifactDiff(BaseModel)` at line 148 with `artifact_id_a`, `artifact_id_b`, `changed_modules`, `changed_bins`, `git_log` |
| `vmcluster_mcp/artifact/registry.py` | `ArtifactRegistry` with hash_tree, load, save, register, list, diff | 228 (min 80) | ✓ VERIFIED | All 6 methods present; `hash_tree()` standalone function; atomic save via `os.replace` |
| `vmcluster_mcp/artifact/__init__.py` | 5 MCP tool registrations | 296 | ✓ VERIFIED | `artifact_register`, `artifact_list`, `artifact_diff`, `artifact_sync`, `artifact_install` all decorated with `@mcp.tool()` + `@structured_tool_handler` |
| `vmcluster_mcp/artifact/syncer.py` | `ArtifactSyncer` with rsync subprocess + dedup | 186 (min 60) | ✓ VERIFIED | `class ArtifactSyncer`, `create_subprocess_exec`, `asyncio.gather`, `test -d`, `StrictHostKeyChecking=no` all present |
| `vmcluster_mcp/artifact/installer.py` | `ArtifactInstaller` with four install modes | 217 (min 60) | ✓ VERIFIED | `class ArtifactInstaller`, `_install_modprobe_path`, `_install_make`, `_install_rpm`, `_install_deb`, `install_all` all present |
| `tests/test_artifact_registry.py` | Unit tests for registry, register, list, diff | 313 (min 50) | ✓ VERIFIED | 19 tests; all pass |
| `tests/test_artifact_sync.py` | Unit tests for sync with dedup, parallel fan-out, per-node failure | 262 (min 40) | ✓ VERIFIED | 8 tests; all pass |
| `tests/test_artifact_install.py` | Unit tests for all four install modes and error handling | 354 (min 40) | ✓ VERIFIED | 13 tests; all pass |

---

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `artifact/__init__.py` | `artifact/registry.py` | `ArtifactRegistry(config.artifact_registry)` | ✓ WIRED | `_registry = ArtifactRegistry(config.artifact_registry)` at line 22 |
| `artifact/__init__.py` | `server.py` | `@mcp.tool()` + `structured_tool_handler` | ✓ WIRED | All 5 tools decorated; `from vmcluster_mcp.server import config, mcp, structured_tool_handler` |
| `server.py` | `vmcluster_mcp/artifact` | `import artifact` triggers tool registration | ✓ WIRED | `from vmcluster_mcp import (artifact, ...)` at line 47 with `# noqa: F401` comment |
| `artifact/syncer.py` | `exec/ssh.py` | `ssh_manager.execute` for dedup check | ✓ WIRED | `await self._ssh.execute(ip, port, user, key_path, f"test -d {dest_path}/{artifact_id}", ...)` |
| `artifact/syncer.py` | `asyncio.create_subprocess_exec` | rsync subprocess | ✓ WIRED | `proc = await asyncio.create_subprocess_exec("rsync", "-avz", "--delete", ...)` |
| `artifact/__init__.py` | `artifact/syncer.py` | `ArtifactSyncer(_ssh_manager)` | ✓ WIRED | `_syncer = ArtifactSyncer(_ssh_manager)` at line 26 |
| `artifact/installer.py` | `exec/ssh.py` | `ssh_manager.execute` for remote install | ✓ WIRED | `result = await self._ssh.execute(ip, port, user, key_path, cmd)` in all four install modes |
| `artifact/__init__.py` | `artifact/installer.py` | `ArtifactInstaller(_ssh_manager)` | ✓ WIRED | `_installer = ArtifactInstaller(_ssh_manager)` at line 27 |
| `artifact/__init__.py` | `topology/parser.py` | `load_topology(cluster_name, config.topology_dir)` | ✓ WIRED | Called in both `artifact_sync` and `artifact_install` tools |

---

### Data-Flow Trace (Level 4)

| Artifact | Data Variable | Source | Produces Real Data | Status |
|----------|---------------|--------|--------------------|--------|
| `artifact_register` tool | `artifact` | `_registry.register(source_path, ...)` → `hash_tree()` + `os.walk()` | Yes — hashes actual filesystem | ✓ FLOWING |
| `artifact_list` tool | `artifacts` | `_registry.list_artifacts()` → `self._registry.values()` | Yes — reads from loaded JSON registry | ✓ FLOWING |
| `artifact_diff` tool | `diff_result` | `_registry.diff()` → `_hash_files()` on both source trees | Yes — re-hashes actual files | ✓ FLOWING |
| `artifact_sync` tool | `sync_status` | `_syncer.sync_all()` → `asyncio.create_subprocess_exec("rsync", ...)` | Yes — real rsync subprocess | ✓ FLOWING |
| `artifact_install` tool | `install_status` | `_installer.install_all()` → `self._ssh.execute(...)` | Yes — real SSH commands | ✓ FLOWING |

---

### Behavioral Spot-Checks

| Behavior | Command | Result | Status |
|----------|---------|--------|--------|
| All artifact classes importable | `python -c "from vmcluster_mcp.artifact.registry import ArtifactRegistry, hash_tree; ..."` | All 4 symbols resolved | ✓ PASS |
| All 5 MCP tools exportable | `python -c "from vmcluster_mcp.artifact import artifact_register, artifact_list, artifact_diff, artifact_sync, artifact_install"` | All 5 names resolved with correct `__name__` | ✓ PASS |
| Artifact test suite | `uv run pytest tests/test_artifact_registry.py tests/test_artifact_sync.py tests/test_artifact_install.py -v` | 40 passed in 0.95s | ✓ PASS |
| Full test suite (no regressions) | `uv run pytest tests/ -q` | 228 passed in 1.87s | ✓ PASS |

---

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|-------------|-------------|--------|----------|
| ART-01 | 05-01-PLAN.md | Agent can register a local build tree as a content-addressed artifact (sha256 of tree content) | ✓ SATISFIED | `artifact_register` tool + `ArtifactRegistry.register()` + `hash_tree()` |
| ART-02 | 05-02-PLAN.md | Agent can sync a registered artifact to cluster nodes via rsync, skipping nodes where it is already present | ✓ SATISFIED | `artifact_sync` tool + `ArtifactSyncer.sync_all()` with `test -d` dedup |
| ART-03 | 05-03-PLAN.md | Agent can install a synced artifact on nodes using `modprobe_path` (default), `make_install`, `rpm`, or `deb` modes | ✓ SATISFIED | `artifact_install` tool + `ArtifactInstaller` with all four modes |
| ART-04 | 05-01-PLAN.md | Agent can list all registered artifacts | ✓ SATISFIED | `artifact_list` tool + `ArtifactRegistry.list_artifacts()` |
| ART-05 | 05-01-PLAN.md | Agent can diff two artifacts to see which `.ko` files and binaries changed | ✓ SATISFIED | `artifact_diff` tool + `ArtifactRegistry.diff()` + `ArtifactDiff` model |

All 5 requirements marked `[x]` complete in REQUIREMENTS.md. No orphaned requirements found.

---

### Anti-Patterns Found

None. No TODOs, FIXMEs, placeholders, empty implementations, or stub patterns found in any artifact pipeline file.

---

### Human Verification Required

None. All behaviors are verifiable programmatically for this phase.

---

### Gaps Summary

No gaps. All 12 observable truths verified, all 8 artifacts substantive and wired, all 9 key links confirmed, all 5 requirements satisfied, 40 dedicated tests pass, full suite of 228 tests passes with no regressions.

---

_Verified: 2026-03-23T22:46:30Z_
_Verifier: GitHub Copilot (gsd-verifier mode)_
