nova-reproduce

name	nova-reproduce
description	Analyze a triaged bug against the Nova source checkout to assess reproducibility. Use after triage to perform deeper source analysis and verify if the bug exists in current master.

Reproduce a Bug Against the Nova Source

Perform a deeper source-based analysis of a triaged bug to determine whether the issue is reproducible in the current master branch. Examines code paths, existing tests, and recent commits.

Input

Optional bug ID. If omitted, uses the previously triaged bug from the current session.

Examples:

• /nova-reproduce (uses last triaged bug)
• /nova-reproduce 2112373

Process

Step 1. Load Context

1. Check if a bug was previously triaged in this session
2. If yes and no bug ID provided: use the previously triaged bug's details and classification
3. If bug ID provided: fetch bug details (same as /nova-triage Step 3) and load any existing triage classification
4. If no prior triage and no bug ID: error with "No bug context available. Run /nova-triage {bug_id} first, or provide a bug ID: /nova-reproduce {bug_id}"

Step 2. Ensure Nova Source Checkout

Check that the Nova source checkout exists at /workspace/repos/nova/.

If missing, automatically clone it:

git clone https://opendev.org/openstack/nova.git /workspace/repos/nova

Inform the user that cloning is in progress — this may take a few minutes.

Step 3. Identify Code Paths

Using the bug description, tracebacks, error messages, and triage classification, identify relevant source files in the Nova checkout at /workspace/repos/nova/:

1. From tracebacks: Extract file paths and function names directly referenced
2. From error messages: Search the codebase for the exact error string to find where it's raised
3. From description: Search for module names, class names, or API endpoint paths mentioned
4. From configuration: If config-related, find the option registration in nova/conf/ and trace its usage

Use Grep to search the Nova codebase. Report all relevant file paths found.

Step 4. Check Existing Tests

Search for tests covering the affected code area:

1. Search nova/tests/unit/ for test files matching the affected module path
2. Search nova/tests/functional/ for functional tests covering the feature area
3. For each relevant test file found, note:
   • What scenarios it covers
   • Whether the reported scenario has test coverage
   • Any gaps in coverage for the reported issue

Step 5. Check Recent Changes

Run git log in the Nova checkout to find recent activity in the affected area:

1. git log --oneline -20 -- {affected_files} — recent commits touching the affected code
2. git log --oneline --all --grep="{bug_id}" — commits referencing this specific bug ID
3. git log --oneline --all --grep="{keywords}" — commits with related keywords
4. For each relevant commit found, note the hash, subject line, and date

Step 6. Assess Reproducibility

Based on the analysis, produce one of these assessments:

• Yes: Evidence suggests the issue is still present in master

  • Code path exists unchanged
  • No related fixes found in git history
  • Tests do not cover the reported scenario

• No: Evidence suggests the issue has been fixed

  • Related fix commit found (cite hash and subject)
  • Code path has been significantly refactored
  • Tests now cover the reported scenario

• Inconclusive: Source analysis alone is insufficient

  • Changes exist but unclear if they address the exact issue
  • Multiple interacting code paths make static analysis difficult
  • The behavior depends on runtime state or timing

• Requires Environment: Issue depends on runtime behavior

  • Hypervisor-specific behavior (libvirt, VMware, etc.)
  • Network-dependent operations
  • Race conditions or timing-sensitive code
  • Requires a running OpenStack deployment to verify

Step 7. Present Assessment

Reproducibility Assessment: {Yes / No / Inconclusive / Requires Environment}

Summary: {1-2 sentence explanation}

Code Paths Examined:

• {file_path}:{line_numbers} — {what was checked}

Existing Test Coverage:

• {test_file} — covers {scenarios}
• Gap: {missing coverage for reported issue}

Recent Commits:

• {hash} {subject} ({date})

Limitations: {what could not be determined from source analysis alone}

Offer next steps:

• /nova-report — include reproduction findings in the triage report
• /nova-update-launchpad — post findings to Launchpad

Output

The reproducibility assessment is held in session memory for use by /nova-report.

No artifact is written by this skill — use /nova-report to generate a persistent artifact.

Writing Style

Follow the rules in rules.md. In particular:

• Cite specific file paths and line numbers
• Reference commit hashes for any fixes or related changes found
• Be honest about limitations — state what source analysis can and cannot determine
• Distinguish between "fixed" (commit exists) and "changed" (code modified but fix unclear)