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karapace/CI_CONTRACT.md
Marco Allegretti bb03d3adad ci: GitHub Actions CI/CD, supply chain hardening, reproducible builds 
- .github/workflows/ci.yml — 17 jobs: fmt, clippy, test, e2e, enospc, e2e-resolve,
  build-release (gnu+musl), smoke-test, reproducibility-check (gnu+musl),
  cross-run-reproducibility (gnu+musl), lockfile-check, cargo-deny, ci-contract
- .github/workflows/release.yml — 4 jobs: build, sign (cosign OIDC), verify, publish
- .github/workflows/supply-chain-test.yml — 11 adversarial jobs: build-and-sign,
  verify-signatures, tamper-binary, tamper-sbom, tamper-signature-removal,
  adversarial-env-injection, adversarial-artifact-tampering, adversarial-build-script,
  adversarial-credential-injection, adversarial-rustflags-bypass, verify-docs-executable
- .github/actions/karapace-build/action.yml — reusable build action
- .cargo/config.toml — SOURCE_DATE_EPOCH=0, local path remapping for reproducibility
- CI_CONTRACT.md — required jobs list enforced by ci-contract gate job
- scripts/generate-sbom.sh — CycloneDX SBOM generation
- CARGO_INCREMENTAL=0 globally, cargo clean before all release builds
- Cosign keyless signing with GitHub Actions OIDC
- 32 total CI jobs across 3 workflows
2026-02-22 18:39:00 +01:00

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CI Contract

This document defines the required CI jobs that must exist in .github/workflows/ci.yml. The ci-contract job enforces this list automatically — if any job is missing, CI fails.

Required Jobs (ci.yml)

Job Name Purpose Enforced
fmt Rustfmt check Yes
clippy Clippy lint Yes
test cargo test --workspace on 3 OS matrix Yes
e2e E2E namespace backend tests (--ignored) Yes
enospc ENOSPC simulation with tmpfs (requires sudo) Yes
e2e-resolve Package resolver E2E on Ubuntu/Fedora/openSUSE Yes
build-release Release build + SBOM + checksums (gnu + musl matrix) Yes
smoke-test Verify release binary runs (gnu + musl matrix) Yes
reproducibility-check Same-run glibc build reproducibility (build A vs B) Yes
reproducibility-check-musl Same-run musl build reproducibility (build A vs B) Yes
cross-run-reproducibility Cross-run glibc reproducibility (ubuntu-latest vs ubuntu-22.04) Yes
verify-cross-reproducibility Compare glibc cross-run build hashes (with diffoscope) Yes
cross-run-reproducibility-musl Cross-run musl reproducibility (ubuntu-latest vs ubuntu-22.04) Yes
verify-cross-reproducibility-musl Compare musl cross-run build hashes Yes
lockfile-check Verify Cargo.lock has not drifted Yes
cargo-deny Dependency policy (licenses, registries, advisories) Yes
ci-contract Self-check: all required jobs exist Yes

Supply Chain Jobs (supply-chain-test.yml)

Job Name Purpose
build-and-sign Build, sign binaries/SBOM, generate provenance attestation
verify-signatures Verify cosign signatures + provenance content
tamper-binary Modify 1 byte in binary, verify detection
tamper-sbom Modify SBOM, verify detection
tamper-signature-removal Delete .sig, verify detection
adversarial-env-injection Test RUSTFLAGS injection, RUSTC_WRAPPER, proxy leak
adversarial-artifact-tampering Tamper multi-rlib, .rmeta, .d, .fingerprint; verify rebuild defense
adversarial-build-script Inject rogue build.rs (marker, HOME, hostname); verify hash change
adversarial-credential-injection Inject fake API keys, AWS secrets, registry tokens; verify no leak
adversarial-rustflags-bypass RUSTFLAGS override + SOURCE_DATE_EPOCH manipulation
verify-docs-executable Execute docs/verification.md commands verbatim

Release Jobs (release.yml)

Job Name Purpose
build Deterministic release build + SBOM + checksums (gnu + musl matrix)
sign Cosign OIDC signing + provenance attestation (per target)
verify Verify all signatures + checksums before publishing (per target)
publish Create GitHub Release with all artifacts (both targets)

Branch Protection

The following jobs MUST be configured as required status checks in GitHub repository settings:

  • Format (fmt)
  • Clippy (clippy)
  • Test (ubuntu) / Test (fedora) / Test (opensuse) (test)
  • E2E Tests (e2e)
  • ENOSPC Tests (enospc)
  • E2E Resolver (ubuntu) / E2E Resolver (fedora) / E2E Resolver (opensuse) (e2e-resolve)
  • Release Build (x86_64-unknown-linux-gnu) / Release Build (x86_64-unknown-linux-musl) (build-release)
  • Smoke Test Release (x86_64-unknown-linux-gnu) / Smoke Test Release (x86_64-unknown-linux-musl) (smoke-test)
  • Reproducibility Check (same-run) (reproducibility-check)
  • Reproducibility Check (musl, same-run) (reproducibility-check-musl)
  • Verify Cross-Run Reproducibility (verify-cross-reproducibility)
  • Cross-Run Reproducibility musl (ubuntu-latest) / Cross-Run Reproducibility musl (ubuntu-22.04) (cross-run-reproducibility-musl)
  • Verify Cross-Run Reproducibility (musl) (verify-cross-reproducibility-musl)
  • Lockfile Integrity (lockfile-check)
  • Dependency Policy (cargo-deny) (cargo-deny)
  • CI Contract (ci-contract)
  • Build, Sign & Attest (build-and-sign)
  • Verify Signatures & Provenance (verify-signatures)
  • Tamper Test: Binary (tamper-binary)
  • Tamper Test: SBOM (tamper-sbom)
  • Tamper Test: Signature Removal (tamper-signature-removal)
  • Adversarial: Environment Injection (adversarial-env-injection)
  • Adversarial: Intermediate Artifact Tampering (adversarial-artifact-tampering)
  • Adversarial: Build Script Injection (adversarial-build-script)
  • Adversarial: Credential Injection (adversarial-credential-injection)
  • Adversarial: RUSTFLAGS Bypass (adversarial-rustflags-bypass)
  • Verify docs/verification.md Commands (verify-docs-executable)

Enforcement

The ci-contract job parses ci.yml and verifies that every ci.yml job listed above is present. If a required job is renamed or removed, CI fails immediately.

Supply-chain test jobs are enforced by the supply-chain-test.yml workflow running on every PR.