Analyze git repositories to build a security ownership topology (people-to-file), compute bus factor and sensitive-code ownership, and export CSV/JSON for graph databases and visualization. Use when the user explicitly wants a security-oriented ownership or bus-factor analysis grounded in git history (for example: orphaned sensitive code, security maintainers, CODEOWNERS reality checks for risk, sensitive hotspots, or ownership clusters). Do NOT use for general maintainer lists, non-security ownership questions, or threat modeling (use security-threat-model).
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Analyze git repositories to build a security ownership topology (people-to-file), compute bus factor and sensitive-code ownership, and export CSV/JSON for graph databases and visualization. Use when the user explicitly wants a security-oriented ownership or bus-factor analysis grounded in git history (for example: orphaned sensitive code, security maintainers, CODEOWNERS reality checks for risk, sensitive hotspots, or ownership clusters). Do NOT use for general maintainer lists, non-security ownership questions, or threat modeling (use security-threat-model).
Build a bipartite graph of people and files from git history, then compute ownership risk and export graph artifacts for Neo4j/Gephi. Also build a file co-change graph (Jaccard similarity on shared commits) to cluster files by how they move together while ignoring large, noisy commits.
Requirements
Python 3
networkx (required; community detection is enabled by default)
Install with:
pip install networkx
Workflow
Scope the repo and time window (optional --since/--until).
Decide sensitivity rules (use defaults or provide a CSV config).
Build the ownership map with scripts/run_ownership_map.py (co-change graph is on by default; use --cochange-max-files to ignore supernode commits).
Communities are computed by default; graphml output is optional (--graphml).
Query the outputs with for bounded JSON slices.
scripts/query_ownership.py
Persist and visualize (see references/neo4j-import.md).
By default, the co-change graph ignores common “glue” files (lockfiles, .github/*, editor config) so clusters reflect actual code movement instead of shared infra edits. Override with --cochange-exclude or --no-default-cochange-excludes. Dependabot commits are excluded by default; override with --no-default-author-excludes or add patterns via --author-exclude-regex.
If you want to exclude Linux build glue like Kbuild from co-change clustering, pass:
Use --community-top-owners 5 (default) to control how many maintainers are stored per community.
Basic security queries
Run these to answer common security ownership questions with bounded output:
# Orphaned sensitive code (stale + low bus factor)
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section orphaned_sensitive_code
# Hidden owners for sensitive tags
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section hidden_owners
# Sensitive hotspots with low bus factor
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section bus_factor_hotspots
# Auth/crypto files with bus factor <= 1
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out files --tag auth --bus-factor-max 1
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out files --tag crypto --bus-factor-max 1
# Who is touching sensitive code the most
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out people --sort sensitive_touches --limit 10
# Co-change neighbors (cluster hints for ownership drift)
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out cochange --file path/to/file --min-jaccard 0.05 --limit 20
# Community maintainers (for a cluster)
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out community --id 3
# Monthly maintainers for the community containing a file
python skills/skills/security-ownership-map/scripts/community_maintainers.py \
--data-dir ownership-map-out \
--file network/card.c \
--since 2025-01-01 \
--top 5
# Quarterly buckets instead of monthly
python skills/skills/security-ownership-map/scripts/community_maintainers.py \
--data-dir ownership-map-out \
--file network/card.c \
--since 2025-01-01 \
--bucket quarter \
--top 5
Notes:
Touches default to one authored commit (not per-file). Use --touch-mode file to count per-file touches.
Use --window-days 90 or --weight recency --half-life-days 180 to smooth churn.
Filter bots with --ignore-author-regex '(bot|dependabot)'.
Use --min-share 0.1 to show stable maintainers only.
Use --bucket quarter for calendar quarter groupings.
Use --identity committer or --date-field committer to switch from author attribution.
Use --include-merges to include merge commits (excluded by default).
Summary format (default)
Use this structure, add fields if needed:
{"orphaned_sensitive_code":[{"path":"crypto/tls/handshake.rs","last_security_touch":"2023-03-12T18:10:04+00:00","bus_factor":1}],"hidden_owners":[{"person":"alice@corp","controls":"63% of auth code"}]}
Graph persistence
Use references/neo4j-import.md when you need to load the CSVs into Neo4j. It includes constraints, import Cypher, and visualization tips.
Notes
bus_factor_hotspots in summary.json lists sensitive files with low bus factor; orphaned_sensitive_code is the stale subset.
If git log is too large, narrow with --since or --until.
Compare summary.json against CODEOWNERS to highlight ownership drift.
