oma-scm

name	oma-scm
description	SCM (software configuration management) and Git — branching, merges, conflicts, worktrees, baselines, audit readiness, plus Conventional Commits and safe staging.

Software configuration management — SCM (oma-scm)

This skill is the single place for configuration management (CM) on a software repo and for Conventional Commits / safe staging.

When to use

• Commits: “commit this”, /scm, message type/scope, splitting staged changes into multiple commits.
• CM / Git: branching (gitflow, GitHub Flow, GitLab Flow, trunk-based), protected branches, merge queue, merge conflicts, rebase, cherry-pick, worktrees, submodules/subtrees, tags and releases.
• Governance: issue/ADR links, breaking-change footers, changelog or release-tool alignment.
• Audit posture: signed commits, CI before merge, secret-sensitive paths.

Configuration

File	Role
config/commit-config.yaml	Conventional Commit types, branch prefixes, message rules
config/cm-config.yaml	CM pointers — documented process, branching model, baselines, changelog

Operating mode (choose first)

Quick Path (commit-focused, default)

Use this when the user intent is mainly "commit this safely."

1. Follow Conventional Commits section only
2. Stage explicit files only
3. Validate message type/scope/length from commit-config.yaml
4. Stop after safe commit unless user asks CM/governance operations

Full CM Path (repo governance / risky history operations)

Use this when the user asks about branching strategy, merges, rebase/cherry-pick, worktrees, release refs, CODEOWNERS, or audit posture.

1. Run CM workflows in order (Planning -> Identification -> Control -> Status accounting -> Verification)
2. Add onboarding risk scan when inheriting or auditing a repository
3. Include commit governance from Conventional Commits when creating commits
4. For large-scope merge operations, use risk scoring and Ask Gate criteria from ../../workflows/scm.md

CM process map (software)

CM function	Intent	Typical artefacts / actions
Management & planning	Agreed rules	CONTRIBUTING.md, SECURITY.md, cm-config.yaml
Configuration identification	What is managed, naming	Branch/tag rules, version files, .gitattributes, LFS
Configuration control	Reviewed change	PRs, checks, issue links, BREAKING CHANGE footers
Status accounting	As-built truth	main / release refs, CHANGELOG, tags, CI status
Verification & audit	Evidence	CI logs, signed commits, lockfiles / SBOM policy

CM workflows (use before risky history operations)

1) Planning

1. Read cm-config.yaml and files listed under documented_process.
2. If missing, infer from CONTRIBUTING.md / README; state assumptions.
3. Confirm branching model and whether force-push on shared branches is allowed (default: not without explicit approval).

2) Identification

1. Canonical refs: default branch, release branches/tags, version sources (package.json, etc.).
2. .gitattributes / LFS for binaries and generated assets.
3. Branch names vs commit-config.yaml branch_prefixes when the project uses them.

3) Control

1. Small, reviewable units; align commits with PR / issue intent.
2. Conflicts: merge-base, git status, resolve markers, tests; suggest rerere when conflicts repeat.
3. Worktrees: git worktree add; merge/rebase from the target branch’s checkout; all worktrees share one object database.
4. Do not rewrite shared history without maintainer approval; prefer --force-with-lease if force-push is unavoidable.

4) Status accounting

1. git status -sb: branch, remote tracking, ahead/behind, merge state.
2. Relate last tag / release branch to CHANGELOG or tooling (semantic-release, release-please, changesets) if present.

5) Verification & audit

1. Required CI and merge_group when merge queue applies.
2. Never stage/commit secrets (.env, keys, raw tokens).
3. Call out signed-commit expectations when the org cares about verification badges.

CODEOWNERS maintenance checklist

1. Validate CODEOWNERS file exists (prefer .github/CODEOWNERS).
2. Ensure critical paths are explicitly owned (not only fallback *).
3. Ensure owners are active and mapped to current teams.
4. Confirm branch protection requires CODEOWNERS review where needed.
5. Flag overlapping/ambiguous rules that can hide intended owners.

Read change_governance.require_codeowners and ownership.* in cm-config.yaml when present.

6) Onboarding risk scan (optional, recommended)

Use this quick scan when joining or inheriting a repository to identify risky areas before major changes.

1. High churn files in lookback window.
2. Ownership concentration / bus-factor signals.
3. Bug hotspot files from fix-related history.
4. Velocity trend by month.
5. Revert/hotfix/emergency frequency.

Read thresholds from cm-config.yaml onboarding_metrics when present and cite caveats:

• squash merge teams can distort ownership metrics,
• weak commit labeling reduces hotspot accuracy,
• monorepo commit counts can bias subsystem interpretation.

---

Conventional Commits

Commit types

Type	Description	Branch Prefix
feat	New feature	feature/
fix	Bug fix	fix/
refactor	Code improvement	refactor/
docs	Documentation changes	docs/
test	Test additions/modifications	test/
chore	Build, configuration, etc.	chore/
style	Code style changes	style/
perf	Performance improvements	perf/

Commit format

<type>(<scope>): <description>

[optional body]

Co-Authored-By: First Fluke <[e-mail]>

Commit workflow

Step 1: Analyze changes

git status
git diff --staged
git log --oneline -5

Step 1.5: Split by feature (if needed)

If changes span multiple features/domains, split commits by feature.

Split when: different scopes, different types, logically independent work.

Do not split when: one feature, few files (≤5), or user asked for a single commit.

Step 2: Determine type

• New capability → feat · Bug fix → fix · Structure-only → refactor · Docs only → docs · Tests → test · Build/config → chore

Step 3: Scope

Use module/component: feat(auth):, fix(api):, or omit: chore: update dependencies

Step 4: Description

≤72 chars (per commit-config.yaml), imperative mood, lowercase start, no trailing period.

Step 5: Execute commit

Show the message, then commit with explicit paths:

git add <specific-files>
git commit -m "$(cat <<'EOF'
<type>(<scope>): <description>

[optional body]
EOF
)"

If HEREDOC is unstable in your shell (or body is long), use file-based commit input:

git add <specific-files>
cat > /tmp/oma-commit-msg.txt <<'EOF'
<type>(<scope>): <description>

[optional body]
EOF
git commit -F /tmp/oma-commit-msg.txt

Use HEREDOC by default, and switch to -F for long or flaky terminal sessions.

References

• config/commit-config.yaml
• config/cm-config.yaml
• resources/conventional-commits.md
• resources/onboarding-risk-signals.md
• resources/codeowners-playbook.md

Important notes

• NEVER git add -A or git add . without explicit user permission.
• NEVER commit likely-secret material.
• ALWAYS stage by explicit paths; tie non-trivial CM work to the five CM rows above, even briefly.