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feat: add setup-nix composite action - #30
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe PR adds a composite GitHub Action that installs upstream Nix and configures Cachix. The README documents the action inputs, SHA-pinning requirements, and setup example. ChangesNix and Cachix setup
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to The new action may fail to install upstream Nix after the January 1, 2026 support cutoff and may allow unintended Cachix pushes when an auth token is provided without a signing key, so the PR is not merge-ready until these bounded risks are addressed or explicitly accepted. Sequence Diagram(s)sequenceDiagram
participant Workflow as GitHub Actions workflow
participant NixInstaller as DeterminateSystems/nix-installer-action
participant Cachix as cachix/cachix-action
Workflow->>NixInstaller: Install upstream Nix with telemetry disabled
NixInstaller-->>Workflow: Complete Nix setup
Workflow->>Cachix: Configure cache name and credentials
Cachix-->>Workflow: Enable Cachix cache
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Description checkExplanation The description explains what the action adds, why it is needed, reviewer notes, and checklist status. It is mostly complete, but it does not include dedicated Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In @.github/actions/setup-nix/action.yml:
- Line 35: Update the Cachix action configuration to set skipPush based on
whether the cachix-signing-key input is empty, while preserving signingKey and
authToken handling so pushes occur only when a signing key is provided. Use the
existing cachix-signing-key input in the action configuration.
- Line 27: Replace the current Nix setup action configuration containing
determinate: false with a maintained upstream Nix installer action, ensuring the
workflow explicitly installs supported upstream Nix rather than relying on the
obsolete --prefer-upstream-nix behavior.
In `@README.md`:
- Around line 145-147: Update the README setup example by replacing the ellipsis
references in the actions/checkout and setup-nix uses entries with valid
40-character commit SHA pins, or explicitly mark those references as
placeholders so the example is not presented as directly copyable.
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.github/actions/setup-nix/action.ymlREADME.md
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cbrgm
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Sep 1, 2026
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AlexHardAtWork
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Sep 2, 2026
) ## What Give dev-kit's own workflows the token-permissions hygiene it asks of consumers, extend the action-pin check to `.github/actions/`, and document `setup-nix` for new repos. Part of opendefensecloud/artifact-conduit#441 ## Why Three of seven workflows had no top-level `permissions:` — the same Token-Permissions gap that was closed in solution-arsenal (17/17) and artifact-conduit (16/16) but never here. It matters more in dev-kit: `docs/NEW_REPO.md` tells people to copy these workflows, so the gap propagates to every new repo. The pin check had a matching blind spot. Since #30, dev-kit ships an action containing two third-party SHA pins, and both the path filter and the grep root stopped at `.github/workflows/` — so the repo that defines the pin standard did not apply it to itself. ## Testing - Ran the widened check against the tree: passes, and now covers `.github/actions/setup-nix/action.yml`. - `actionlint` clean; all workflow and action YAML parses. ## Notes for reviewers - **Latent bug fixed in passing:** the check used `grep -rE`, and `-r` prefixes each output line with its filename, so the next filter — `grep -vE '^\s+(- )?uses: \./'`, the local-action exclusion — could never match. Any `uses: ./` would have been reported as unpinned. Harmless so far (dev-kit references no local actions), but widening the scan made it worth correcting. Solar's copy already uses `-rhE`; this aligns them. - `issues-add-to-project` gets job-level `permissions: {}` — it authenticates with `ADD_TO_PROJECT_PAT`, so `GITHUB_TOKEN` needs no scopes. `issues-add-labels` keeps its existing job-level `issues: write`. Placement matches Solar's convention. - `NEW_REPO.md`: adds the Cachix org secrets to §4, `update-action-pins.yml` to the §5 workflow table (also missing), and a "Nix-based CI" subsection with the `setup-nix` caller snippet and the fork-PR read-only note. - `README.md`: the `setup-nix` example said `# v2.1.0`, which is the envtest-sideload release (#29) — cut before #30 merged, so it does not contain the action. Now `# <tag>`. - No Renovate config added — dev-kit is the only repo without one, but the reason is unknown and that is a separate decision. ## Checklist - [ ] Tests added/updated — n/a, no shell script to test - [x] No breaking changes (or upgrade path documented above) - [x] Readable commit history (squashed and cleaned up as desired) - [ ] AI code review considered and comments resolved <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit - **Security** - Strengthened automation permissions by limiting workflows to only the access they require. - **Maintenance** - Expanded action pin checks to include actions throughout the automation configuration. - Monitors changes to shared actions as well as workflow files. - **Documentation** - Updated setup guidance for pinned actions. - Added instructions for Nix-based CI and documented required authentication secrets. - Documented the action-pin maintenance workflow. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
2 of 4 tasks
AlexHardAtWork
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Sep 3, 2026
## What Replace the inline nix + Cachix preamble in six workflows with dev-kit's `setup-nix` composite action, and put all dev-kit references on **v2.2.0**. ## Why The installer + Cachix pair was copy-pasted at **8 call sites**. Extracting it to dev-kit ([#30](opendefensecloud/dev-kit#30), released in [v2.2.0](https://github.com/opendefensecloud/dev-kit/releases/tag/v2.2.0)) means the installer choice is changed in one place instead of fourteen once artifact-conduit adopts the same action. Solar also carried **three** dev-kit pins at two different versions. Now one. ## Testing - Solar's own `update-action-pins` check passes — every `uses:` is SHA-pinned. - `actionlint` clean before the pin swap; the only findings are two pre-existing SC2086 infos in `docker.yaml` / `release-please.yaml`, both untouched here. - Real verification is this PR's own CI run: `golang`, `codegen`, `helm-lint`, `helm-publish`, `test-e2e` and `test-demo` all go through the new action. ## Notes for reviewers No behaviour change intended — same installer, same pins, same Cachix cache. - **`determinate: false` and the empty `diagnostic-endpoint` moved into the action**, along with the comments explaining them. Same values as before. - **Secrets are still passed by the caller.** Composite actions have no `secrets` context, so `cachix-auth-token` / `cachix-signing-key` are inputs. Both default to `''`, which is the existing fork-PR read-only fallback. - **`diff-check` and `renovate-auto-approve` moved v1.0.15 → v2.2.0.** Both files are byte-identical between those tags — a pin refresh, not an upgrade. - Go cache steps and their trust-scoping comments (#237) are untouched. - `release-please.yaml` and `docker.yaml` keep their own setup; out of scope. Prepares artifact-conduit#441, which will use the same action. ## Checklist - [ ] Tests added/updated <!-- n/a — CI config only --> - [x] No breaking changes (or upgrade path documented above) - [x] Readable commit history (squashed and cleaned up as desired) - [ ] AI code review considered and comments resolved <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Chores** * Standardized Nix installation and shared cache configuration across automated code generation, linting, testing, publishing, and end-to-end workflows. * Updated workflow tooling to use the latest shared automation configuration. * Updated the automated dependency-update approval workflow to a newer version. * **Tests** * Preserved existing code generation, validation, publishing, and end-to-end test coverage while simplifying their environment setup. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
2 of 4 tasks
AlexHardAtWork
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Sep 9, 2026
## What Run all six tool-installing workflows inside the nix dev shell, so CI and local development share one toolchain definition. Closes #441 ## Why CI installed `kind`/`kubectl`/`helm` by curl, Go via `setup-go`, helm via `azure/setup-helm`, and `sed`-grepped the Go version out of `flake.nix` — while the flake already pinned all of them. The nix preamble comes from dev-kit's `setup-nix` action ([dev-kit#30](opendefensecloud/dev-kit#30), v2.2.0), proven in solution-arsenal#792. ## Testing - **`make test` green** on dev-kit's sideload script — 6 suites, 67 specs. This needed real verification: ARC's own script was 43 lines behind and had never run that code path. - **kind spike** — nixpkgs `kind v0.32.0` stood up a real `kindest/node:v1.36.1` cluster and scheduled a pod. `kubectl v1.36.3` vs a `v1.36.1` server is inside skew. - `actionlint` clean (one pre-existing SC2086 in untouched `docker.yaml`); `update-action-pins` passes; dev shell resolves go/kind/kubectl/helm/shellcheck. - **Needs this PR's CI:** `test-e2e` (it is `workflow_call`, driven by `docker.yaml`) and cachix cold-start cost. ## Notes for reviewers **Two developer-visible changes.** - **Committing no longer runs an osv-scanner scan** — inherited from dev-kit v2.0.0's `feat!: disable osv-scanner pre-commit hook by default`. Its condition holds here: `osv-scanner.yml` still scans every PR, every push to main, and weekly. `make scan` runs it locally. - **`kubectl` moves off floating `stable.txt`** to the nixpkgs pin (1.36.3). Unavoidable when sourcing from nix, and better than a version that can drift ahead of the server. `helm` is a true no-op — v4.2.4 both before and after. **cosign is unchanged.** `pkgs.cosign` is dropped from the flake because it was unused and would have shadowed `cosign-installer` under a nix shell, silently changing which cosign signs releases. The installer stays in all three signing workflows, one pin, Renovate-managed — matching solution-arsenal, whose flake also has no cosign. **Go caches are new, not scope creep.** `setup-go` warmed `GOMODCACHE`/`GOCACHE` implicitly; dropping it without a replacement would regress. Keys are per-job and trust-scoped (`pr`/`trusted`). `release.yaml` deliberately gets none — privileged signing job, preserving the old `setup-go` `cache: false`. **Both dev-kit pins now agree at v2.2.0.** The flake input was floating on a commit older than v1.0.15. Adopting dev-kit's envtest sideloading needed the `DEV_KIT_VERSION` bump anyway, since `common.mk` now provides the `envtest-binaries-sideload` target ARC carried locally. **Non-goal: `on.paths` gating.** `golang.yaml` keeps its path filters. `protect-main` requires only `check` and `CodeQL`, and `codegen.yaml` has no filters, so nothing can fail to report today — but if `lint`/`test` are ever made required, they must move to a `changes` job first or a docs-only PR will never report. **Scope was six workflows, not four** — `codegen.yaml` and `helm-publish.yaml` also called `setup-go`/`setup-helm`. **Three corrections for the issue text:** `test-e2e.yaml` installs no `yq` and no `flux` (only kind, kubectl, helm); there is no `apt-get` anywhere in `.github/workflows/`; `golangci-lint` comes from `tools.lock`, not nix. ## Checklist - [ ] Tests added/updated <!-- n/a — CI and build config only --> - [x] No breaking changes (or upgrade path documented above) - [x] Readable commit history (squashed and cleaned up as desired) - [ ] AI code review considered and comments resolved <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Chores** * Updated development tooling to version 2.2.0. * Standardized CI workflows on a Nix-based development environment with shared caching. * Improved Go module and build cache restoration for linting and tests. * Updated workflow change detection and diff validation. * Consolidated lint execution through the project’s Makefile. * Removed the local environment-test binary sideloading step. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
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What
Add a
setup-nixcomposite action that installs upstream Nix and enables the sharedCachix cache, replacing the two-step preamble every nix-based CI job currently copies.
Part of opendefensecloud/artifact-conduit#441
Notes for reviewers
Composite actions have no
secretscontext, so the caller passes them in:cachix-auth-token/cachix-signing-keyare inputs defaulting to''. That default isdeliberate — an empty token is exactly the read-only fallback
cachix-actiontakes onfork PRs, which is what Solar relies on today. This holds regardless of the secrets being
org-level.
cachix-namedefaults toopendefensecloud, so a typical caller passes only the twosecrets.
Purely additive — nothing references the action yet, so there is no upgrade path to
document.
update-action-pins.ymlgreps only.github/workflows/and triggers only on that path,so the two SHA pins now living in
.github/actions/setup-nix/action.ymlare outside thepin check. They are correctly pinned with version comments; widening the check to
.github/is a small follow-up, left out of this PR to keep it to one concern.The README gains a
### GitHub Actionssection covering all three composite actions —the existing two were undocumented.
Checklist
Tests added/updated — n/a, no shell script to test (see Testing)
No breaking changes (or upgrade path documented above)
Readable commit history (squashed and cleaned up as desired)
AI code review considered and comments resolved
Summary by CodeRabbit
New Features
Documentation