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83 lines
4.5 KiB
Markdown
83 lines
4.5 KiB
Markdown
# Branch protection on `main`
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`main` is gated by a declarative branch-protection policy. The source of truth is `.github/branch-protection.json`; the apply mechanism is `scripts/apply-branch-protection.sh`. Re-running the script with a changed JSON is idempotent.
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This page explains what the policy says and how to change it.
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## Current policy
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| Setting | Value | Why |
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| **Required status checks (strict)** | `Classify Changes`, `Check AGENTS.md Links`, `Test Workspace`, `Test omnigraph-server --features aws`, `CODEOWNERS / drift`, `CODEOWNERS / noedit` | Every PR must pass workspace tests, AGENTS.md link integrity, and the CODEOWNERS hygiene checks. `strict: true` requires the branch to be up-to-date with `main` before merge. |
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| **Required approving reviews** | `1` | At least one reviewer. With a 2-person team, going higher would block all merges when one person is unavailable. |
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| **Require code-owner reviews** | `true` | The reviewer must be a code owner per `.github/CODEOWNERS`. This is what makes the codeowners chassis enforced. |
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| **Dismiss stale reviews on new commits** | `true` | A push after approval invalidates the prior review. Prevents the "approve, then sneak in unreviewed changes" pattern. |
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| **Require linear history** | `true` | No merge commits — squash or rebase only. Matches recent practice. |
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| **Disallow force pushes** | `true` | No history rewrites on `main`. |
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| **Disallow branch deletions** | `true` | `main` cannot be deleted. |
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| **Required conversation resolution** | `true` | All review comment threads must be resolved before merge. |
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| **Enforce on admins** | `true` | Even repository admins go through the gates. The point is no bypasses. |
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| **Required signed commits** | not yet | Not enabled. Would lock out maintainers until everyone enrolls GPG/SSH commit signing. Tracked as a follow-up. |
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## How to apply
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Run from the repository root:
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```bash
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./scripts/apply-branch-protection.sh
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```
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The script reads `.github/branch-protection.json`, strips the human-readable `_comment` field (the GitHub API rejects unknown keys), and PUTs to `repos/ModernRelay/omnigraph/branches/main/protection`.
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Requires `gh` authenticated with a token that has admin permissions on the repository.
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To preview without applying:
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```bash
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DRY_RUN=1 ./scripts/apply-branch-protection.sh
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```
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## How to change the policy
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1. Edit `.github/branch-protection.json`.
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2. Open a PR. The JSON change goes through normal review.
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3. After the PR merges, an admin runs `./scripts/apply-branch-protection.sh` to push the new policy to GitHub.
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The script is **not run automatically** by CI. Branch-protection changes are admin actions that should be applied deliberately — a CI-driven automatic apply would mean any merged PR could rewrite protection rules, which defeats the purpose. The script's existence makes the apply reproducible; the admin's manual invocation is the audit point.
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## How to read the current GitHub state
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```bash
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gh api repos/ModernRelay/omnigraph/branches/main/protection
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```
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Outputs the live policy. Compare against `.github/branch-protection.json` to detect drift.
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## Why declared as code
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- **Audit trail**: `git log .github/branch-protection.json` shows every change with a reviewable diff and a merge commit.
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- **Disaster recovery**: if branch protection is accidentally removed or weakened via the UI, the JSON is the canonical recovery point.
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- **Consistency**: pairs with `.github/codeowners-roles.yml` (the CODEOWNERS source of truth). Repository policy lives in the repository.
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## What this gates
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After branch protection is applied, every PR targeting `main` must:
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1. Pass all listed status checks.
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2. Be up-to-date with `main` (rebase or merge-from-main).
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3. Have at least one approving review from a code owner for the touched paths.
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4. Have all review conversations resolved.
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5. Be squash- or rebase-merged (no merge commits).
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Even repository admins are subject to these rules.
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## Subsequent hardening (not in this PR)
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The branch-protection policy is the foundation. Future hardening adds:
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- **Required signed commits** (`required_signatures: true`) — once maintainers enroll GPG/SSH signing.
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- **Tag protection** for `v*` tags via `repos/.../tags/protection`.
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- **Required reviewers from specific teams** for high-leverage paths (e.g., `docs/dev/invariants.md`) via CODEOWNERS tier expansion + the N-unique-approvers CI workaround.
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- **More required CI checks**: `cargo deny`, `cargo audit`, `cargo fmt --check`, `cargo clippy -D warnings`, CodeQL, secret scanning, schema-lint (MR-946).
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See the hardening playbook for the full plan.
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