48 lines
2.3 KiB
Markdown
48 lines
2.3 KiB
Markdown
# Mirror bundle signing runbook (CI)
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## Prerequisites
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- Ed25519 private key (PEM). Keep in CI secrets only.
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- Base64-encode the PEM: `base64 -w0 mirror-ci-ed25519.pem > mirror-ci-ed25519.pem.b64`.
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- Create CI secret `MIRROR_SIGN_KEY_B64` with that value.
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## Pipeline step (Gitea example)
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```
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- name: Build/sign mirror thin bundle
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env:
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MIRROR_SIGN_KEY_B64: ${{ secrets.MIRROR_SIGN_KEY_B64 }}
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REQUIRE_PROD_SIGNING: 1
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OCI: 1
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run: |
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scripts/mirror/check_signing_prereqs.sh
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scripts/mirror/ci-sign.sh
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```
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Outputs are placed under `out/mirror/thin/` and `out/mirror/thin/oci/`; archive these as artifacts.
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### How to add the secret in Gitea (one-time)
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1. Repository → Settings → Secrets.
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2. New secret: name `MIRROR_SIGN_KEY_B64`, value = base64-encoded Ed25519 PEM (no newlines, no header/footer).
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3. Scope: repository (or environment-specific if needed).
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4. Save. The pipeline step will skip if the secret is empty; keep it present in release branches only.
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## Local dry-run with test key
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```
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MIRROR_SIGN_KEY_B64=$(base64 -w0 out/mirror/thin/tuf/keys/mirror-ed25519-test-1.pem) \
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OCI=1 scripts/mirror/ci-sign.sh
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```
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## Temporary dev key (to unblock CI until production key is issued)
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Use this throwaway Ed25519 key only for non-production runs. Generated 2025-11-23 to replace the previous placeholder; rotate TUF metadata immediately after swapping in the production key.
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```
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MIRROR_SIGN_KEY_B64=LS0tLS1CRUdJTiBQUklWQVRFIEtFWS0tLS0tCk1DNENBUUF3QlFZREsyVndCQ0lFSURqb3pDRVdKVVFUdW1xZ2gyRmZXcVBaemlQbkdaSzRvOFZRTThGYkZCSEcKLS0tLS1FTkQgUFJJVkFURSBLRVktLS0tLQo=
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```
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**Do not ship with this key.** Set `REQUIRE_PROD_SIGNING=1` for release/tag builds so they fail without the real key. Add the production key as a Gitea secret (`MIRROR_SIGN_KEY_B64`) and rerun the workflow; remove this temporary key block once rotated.
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## Verification
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The CI step already runs `scripts/mirror/verify_thin_bundle.py`. For OCI, ensure `out/mirror/thin/oci/index.json` references the manifest digest.
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## Fallback (if secret absent)
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- CI can fall back to an embedded test Ed25519 key when `MIRROR_SIGN_KEY_B64` is unset **only when `REQUIRE_PROD_SIGNING` is not set**. This is for dev smoke runs; release/tag jobs must set `REQUIRE_PROD_SIGNING=1` to forbid fallback.
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- For release branches, always set `REQUIRE_PROD_SIGNING=1` and provide `MIRROR_SIGN_KEY_B64`; otherwise the step will fail early.
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