mizchi/actrun

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# actrun A local GitHub Actions runner built with [MoonBit](https://docs.moonbitlang.com). Run and debug GitHub Actions workflows locally with a `gh`-compatible CLI. actrun keeps its release contract as close as possible to existing GitHub Actions semantics. Workflow YAML and action metadata stay on a GitHub-compatible surface, while WASM support is treated as a self-hosted runner optimization. See [docs/public-api.md](docs/public-api.md) for the contract boundary and [ADR 0001](docs/adr/0001-public-api-boundary.md) for the rationale. ## Install ```bash # npx (no install required) npx @mizchi/actrun workflow run .github/workflows/ci.yml # curl (Linux / macOS) curl -fsSL https://raw.githubusercontent.com/mizchi/actrun/main/install.sh | sh # Docker docker run --rm -v "$PWD":/workspace -w /workspace ghcr.io/mizchi/actrun workflow run .github/workflows/ci.yml # npm global install npm install -g @mizchi/actrun # Nix (run without installing) nix run github:mizchi/actrun -- workflow run .github/workflows/ci.yml # Nix (install into profile) nix profile install github:mizchi/actrun # moon install moon install mizchi/actrun/cmd/actrun # Build from source git clone https://github.com/mizchi/actrun.git && cd actrun moon build src/cmd/actrun --target native ``` ## Nix ### Run directly ```bash nix run github:mizchi/actrun -- workflow run .github/workflows/ci.yml ``` ### Build from source ```bash nix build github:mizchi/actrun ./result/bin/actrun workflow run .github/workflows/ci.yml ``` ### Development shell <details> <summary>With direnv (recommended)</summary> With [direnv](https://direnv.net/) and [nix-direnv](https://github.com/nix-community/nix-direnv): ```bash echo "use flake" > .envrc direnv allow ``` </details> Or without direnv: ```bash nix develop ``` ### Adding the overlay to your flake.nix ```nix { inputs = { nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable"; actrun.url = "github:mizchi/actrun"; }; outputs = { nixpkgs, actrun, ... }: let system = "aarch64-darwin"; # or "x86_64-linux" pkgs = import nixpkgs { inherit system; overlays = [ actrun.overlays.default ]; }; in { packages.${system}.default = pkgs.actrun; devShells.${system}.default = pkgs.mkShell { packages = [ pkgs.actrun ]; }; }; } ``` ### Without flakes ```nix # default.nix provides a ready-to-use derivation let actrun = import (builtins.fetchTarball "https://github.com/mizchi/actrun/archive/main.tar.gz") { }; in actrun ``` ## Quick Start ```bash # Run a workflow locally actrun workflow run .github/workflows/ci.yml # Show execution plan without running actrun workflow run .github/workflows/ci.yml --dry-run # Emit flow cache plan JSON for an external orchestrator actrun workflow run .github/workflows/ci.yml \ --dry-run \ --json \ --flow-cache-store /tmp/flow-cache.json \ --flow-signature build=sig-build # Skip actions not needed locally (e.g. setup tools already installed) actrun workflow run .github/workflows/ci.yml \ --skip-action actions/checkout \ --skip-action extractions/setup-just # Run in isolated worktree actrun workflow run .github/workflows/ci.yml \ --workspace-mode worktree # Generate config file actrun init # View results actrun run view run-1 actrun run logs run-1 --task build/test ``` ## Configuration `actrun init` generates an `actrun.toml` in the current directory: ```toml # Workspace mode: local, worktree, tmp, docker workspace_mode = "local" # Skip actions not needed locally local_skip_actions = ["actions/checkout"] # Trust all third-party actions without prompt trust_actions = true # Nix integration: "auto" (force), "off" (disable), or empty (auto-detect) nix_mode = "" # Additional nix packages nix_packages = ["python312", "jq"] # Container runtime: docker, podman, container, lima, nerdctl container_runtime = "docker" # Include uncommitted changes in worktree/tmp workspace # include_dirty = true # Default local GitHub context when `--event` is omitted # [local_context] # repository = "owner/repo" # ref_name = "main" # before_rev = "HEAD^" # after_rev = "HEAD" # actor = "your-name" # Override actions with local commands # [override."actions/setup-node"] # run = "echo 'using local node' && node --version" # Affected file patterns per workflow # [affected."ci.yml"] # patterns = ["src/**", "package.json"] ``` When `--event` is omitted, actrun auto-detects `github.repository`, `github.ref_name`, `github.sha`, and `github.actor` from the local git repository when possible. Use `[local_context]` only when you need to pin or override those values. See [Local GitHub Context](docs/local-context.md) for precedence and examples. CLI flags always override `actrun.toml` settings. See [Cheatsheet](docs/cheatsheet.md) for quick reference and [Advanced Workflow](docs/advanced-workflow.md) for details. ## Flow Cache Use `--flow-cache-store <path>` together with one or more `--flow-signature <job-or-task>=<fingerprint>` flags to exchange task cache state with the embedded `bitflow` planner. `--dry-run --json` includes a `flow_cache.plan` payload with per-task hit/miss information. A normal run writes successful task fingerprints back to the same store and persists both the plan and writeback result under `run.json` as `flow_cache.plan` and `flow_cache.writeback`. ## CLI Reference ### Workflow Commands ```bash actrun workflow list # List workflows in .github/workflows/ actrun workflow run <workflow.yml> # Run a workflow locally ``` ### Run Commands ```bash actrun run list # List past runs actrun run view <run-id> # View run summary actrun run view <run-id> --json # View run as JSON actrun run watch <run-id> # Watch until completion actrun run logs <run-id> # View all logs actrun run logs <run-id> --task <id> # View specific task log actrun run download <run-id> # Download all artifacts ``` ### Analysis Commands ```bash # Lint: type check expressions and detect dead code actrun lint # Lint all .github/workflows/*.yml actrun lint .github/workflows/ci.yml # Lint a specific file actrun lint --ignore W001 # Suppress a rule (repeatable) # Visualize: render workflow job dependency graph actrun viz .github/workflows/ci.yml # ASCII art (terminal) actrun viz .github/workflows/ci.yml --mermaid # Mermaid text (for Markdown) actrun viz .github/workflows/ci.yml --detail # Mermaid with step subgraphs actrun viz .github/workflows/ci.yml --svg # SVG image actrun viz .github/workflows/ci.yml --svg --theme github-light ``` #### Lint Diagnostics | Rule | Severity | Description | |------|----------|-------------| | `undefined-context` | error | Undefined context (e.g. `foobar.x`) | | `wrong-arity` | error | Wrong function arity (e.g. `contains('one')`) | | `unknown-function` | error | Unknown function (e.g. `myFunc()`) | | `unknown-property` | warning | Unknown property (e.g. `github.nonexistent`) | | `type-mismatch` | warning | Comparing incompatible types | | `unreachable-step` | warning | Unreachable step (`if: false`) | | `future-step-ref` | error | Reference to future step | | `undefined-step-ref` | error | Reference to undefined step | | `undefined-needs` | error | Undefined `needs` job reference | | `circular-needs` | error | Circular `needs` dependency | | `unused-outputs` | warning | Unused job outputs | | `duplicate-step-id` | error | Duplicate step IDs in same job | | `missing-runs-on` | error | Missing `runs-on` | | `empty-job` | error | Empty job (no steps) | | `uses-and-run` | error | Step has both `uses` and `run` | | `empty-matrix` | warning | Matrix with empty rows | | `invalid-uses` | error | Invalid `uses` syntax | | `invalid-glob` | warning | Invalid glob pattern in trigger filter | | `redundant-condition` | warning | Always-true/false condition | | `script-injection` | warning | Script injection risk (untrusted input in `run:`) | | `permissive-permissions` | warning | Overly permissive permissions | | `deprecated-command` | warning | Deprecated workflow command (`::set-output` etc.) | | `missing-prt-permissions` | warning | `pull_request_target` without explicit `permissions` | | `if-always` | warning | Bare `always()` — prefer `success() \|\| failure()` | | `dangerous-checkout-in-prt` | error | Checkout PR head in `pull_request_target` | | `secrets-to-third-party` | warning | Secrets passed via env to third-party action | | `missing-timeout` | warning | No `timeout-minutes` (opt-in: `--strict`) | | `mutable-action-ref` | warning | Tag ref instead of SHA pin (opt-in: `--online`) | | `action-not-found` | error | Action ref not found on GitHub (opt-in: `--online`) | Configure lint behavior in `actrun.toml`: ```toml [lint] preset = "default" # default, strict, oss ignore_rules = ["unknown-property", "unused-outputs"] ``` | Preset | Includes | |--------|----------| | `default` | All rules except `missing-timeout` and online checks | | `strict` | `default` + `missing-timeout` | | `oss` | `strict` + `mutable-action-ref` / `action-not-found` (network) | #### Visualization Example ``` $ actrun viz .github/workflows/release.yml ┌───────┐ ┌─────┐ ┌────────┐ │ build │ │ npm │ │ docker │ └───────┘ └─────┘ └────────┘ │ └────────────┐ │ ┌─────────┐ │ release │ └─────────┘ ``` ### Artifact & Cache Commands ```bash actrun artifact list <run-id> # List artifacts actrun artifact download <run-id> --name <name> # Download artifact actrun cache list # List cache entries actrun cache prune --key <key> # Delete cache entry ``` ### Workflow Run Flags | Flag | Description | |------|-------------| | `--dry-run` | Show execution plan without running | | `--skip-action <pattern>` | Skip actions matching pattern (repeatable) | | `--workspace-mode <mode>` | `worktree` (default), `local`, `tmp`, `docker` | | `--repo <path>` | Run from a git repository | | `--event <path>` | Push event JSON file | | `--repository <owner/repo>` | GitHub repository name | | `--ref <ref>` | Git ref name | | `--run-root <path>` | Run record storage root | | `--nix` | Force nix wrapping for run steps | | `--no-nix` | Disable nix wrapping even if flake.nix/shell.nix exists | | `--nix-packages <pkgs>` | Ad-hoc nix packages (space-separated) | | `--container-runtime <name>` | Container runtime: `docker`, `podman`, `container`, `lima`, `nerdctl` | | `--wasm-runner <kind>` | Wasm runner kind: `wasmtime`, `deno`, `v8` | | `--affected [base]` | Only run if files matching patterns changed (see below) | | `--retry` | Re-run only failed jobs from the latest run | | `--include-dirty` | Include uncommitted changes in worktree/tmp workspace | | `--json` | JSON output for read commands and `--dry-run` | ## Affected Runs Skip workflows when no relevant files have changed. Patterns are resolved in order: 1. `actrun.toml` `[affected."<workflow>"]` patterns 2. `on:push:paths` from the workflow file (automatic fallback) ```bash # Compare against last successful run (default) actrun ci.yml --affected # Compare against a specific rev actrun ci.yml --affected HEAD~3 actrun ci.yml --affected abc1234 # Preview what would happen (shows plan even if skipped) actrun ci.yml --affected HEAD~1 --dry-run ``` Configure patterns in `actrun.toml`: ```toml [affected."ci.yml"] patterns = ["src/**", "package.json"] [affected.".github/workflows/lint.yml"] patterns = ["src/**", "*.config.*"] ``` If `actrun.toml` has no patterns, `on:push:paths` from the workflow is used automatically: ```yaml on: push: paths: ["src/**", "*.toml"] # actrun --affected uses these ``` ## Workspace Modes | Mode | Description | |------|-------------| | `local` | Run in-place in the current directory | | `worktree` | Create an isolated `git worktree` for execution (default) | | `tmp` | Clone to a temp directory via `git clone` | | `docker` | Run in a Docker container | ## Container Runtime actrun supports multiple container runtimes for job `container:`, `services:`, and `docker://` actions. | Runtime | Binary | Notes | |---------|--------|-------| | `docker` | `docker` | Default | | `podman` | `podman` | Docker-compatible CLI | | `container` | `container` | Apple container runtime (macOS) | | `nerdctl` | `nerdctl` | containerd CLI | | `lima` | `lima nerdctl` | Lima VM with nerdctl (wrapper script auto-generated) | ```bash # CLI flag actrun workflow run ci.yml --container-runtime podman # actrun.toml container_runtime = "podman" # Environment variable (also works) ACTRUN_CONTAINER_RUNTIME=podman actrun workflow run ci.yml ``` ## Supported GitHub Actions ### Builtin Actions (deterministic emulation) | Action | Supported Inputs | |--------|-----------------| | `actions/checkout@*` | `path`, `ref`, `fetch-depth`, `clean`, `sparse-checkout`, `submodules`, `lfs`, `fetch-tags`, `persist-credentials`, `set-safe-directory`, `show-progress` | | `actions/upload-artifact@*` | `name`, `path`, `if-no-files-found`, `overwrite`, `include-hidden-files` | | `actions/download-artifact@*` | `name`, `path`, `pattern`, `merge-multiple` | | `actions/cache@*` | `key`, `path`, `restore-keys`, `lookup-only`, `fail-on-cache-miss` | | `actions/cache/save@*` | `key`, `path` | | `actions/cache/restore@*` | `key`, `path`, `restore-keys`, `lookup-only`, `fail-on-cache-miss` | | `actions/setup-node@*` | `node-version`, `node-version-file`, `cache`, `registry-url`, `always-auth`, `scope` | ### Remote Actions (fetch + execute) - GitHub repo `node` actions with `pre`/`main`/`post` lifecycle - GitHub repo `docker` actions with `pre-entrypoint`/`entrypoint`/`post-entrypoint` lifecycle - Composite actions (local and remote) - `docker://image` direct execution ### Self-Hosted WASM Optimization - A self-hosted runner may prefer a sibling `*.wasm` file next to a standard `node*` action `runs.main` - The same action still runs on GitHub Actions through the normal JS fallback path - The runtime family is selected with `--wasm-runner` / `ACTRUN_WASM_RUNNER` Protocol extensions such as `wasm://...` and `runs-on: wasi` are experimental / internal and are not part of the release contract. See [docs/public-api.md](docs/public-api.md) for details. ## Local-Only Execution Flag actrun sets `ACTRUN_LOCAL=true` in the execution environment. Use this in `if:` conditions to skip steps locally or run steps only locally: ```yaml steps: # Skipped when running locally (runs on GitHub Actions) - uses: actions/checkout@v5 if: ${{ !env.ACTRUN_LOCAL }} # Runs only locally (skipped on GitHub Actions) - run: echo "local debug info" if: ${{ env.ACTRUN_LOCAL }} ``` On GitHub Actions, `ACTRUN_LOCAL` is not set, so `!env.ACTRUN_LOCAL` evaluates to `true` and all steps run normally. ## Action Overrides Replace specific `uses:` action steps with custom `run:` commands via `actrun.toml`. This is useful when you have tools installed locally and want to skip the action's setup logic. ```toml [override."actions/setup-node"] run = "echo 'using local node' && node --version" ``` When a workflow step matches `uses: actions/setup-node@*`, actrun replaces it with the specified `run:` command before execution. Combine with `local_skip_actions` for full control: ```toml local_skip_actions = ["actions/checkout"] [override."actions/setup-node"] run = "echo 'using local node'" [override."actions/setup-python"] run = "python3 --version" ``` ## Secrets & Variables ```bash # Provide secrets via environment variables ACTRUN_SECRET_MY_TOKEN=xxx actrun workflow run ci.yml # Provide variables ACTRUN_VAR_MY_VAR=value actrun workflow run ci.yml ``` Secrets are automatically masked in stdout, stderr, logs, and run store. The `::add-mask::` workflow command is also supported. ## Environment Variables | Variable | Description | |----------|-------------| | `ACTRUN_SECRET_<NAME>` | `${{ secrets.<name> }}` | | `ACTRUN_VAR_<NAME>` | `${{ vars.<name> }}` | | `ACTRUN_NODE_BIN` | Node.js binary path | | `ACTRUN_DOCKER_BIN` | Docker binary path | | `ACTRUN_WASM_RUNNER` | Wasm runner kind: `wasmtime`, `deno`, `v8` | | `ACTRUN_WASM_BIN` | Wasm runtime binary (default: `wasmtime`) | | `ACTRUN_GIT_BIN` | Git binary path | | `ACTRUN_GITHUB_BASE_URL` | GitHub API base URL | | `ACTRUN_ARTIFACT_ROOT` | Artifact storage root | | `ACTRUN_CACHE_ROOT` | Cache storage root | | `ACTRUN_GITHUB_ACTION_CACHE_ROOT` | Remote action cache root | | `ACTRUN_ACTION_REGISTRY_ROOT` | Custom registry root | | `ACTRUN_NIX` | Set to `false` to disable nix wrapping | `ACTRUN_WASM_RUNNER` を指定した場合、default bin は `wasmtime` / `deno` / `ACTRUN_NODE_BIN` (`v8`) に切り替わります。`ACTRUN_WASM_BIN` を併用すると、runner kind は固定したまま実行 binary だけ上書きできます。 ## Nix Integration actrun automatically detects `flake.nix` or `shell.nix` in the workspace root and wraps `run:` steps in the corresponding nix environment. This lets workflows written for `ubuntu-latest` run locally with nix-managed toolchains. ### Auto-detection | Condition | Wrapping | |-----------|----------| | `flake.nix` exists | `nix develop --command <shell> <script>` | | `shell.nix` exists | `nix-shell --run '<shell> <script>'` | | Neither exists | No wrapping (host environment) | Detection requires `nix` to be installed. If `nix` is not found, wrapping is silently skipped. ### Examples ```bash # Auto-detect flake.nix / shell.nix actrun workflow run .github/workflows/ci.yml # Disable nix wrapping actrun workflow run .github/workflows/ci.yml --no-nix # Ad-hoc packages without flake.nix actrun workflow run .github/workflows/ci.yml --nix-packages "python312 jq" # Disable via environment variable ACTRUN_NIX=false actrun workflow run .github/workflows/ci.yml ``` ### Typical flake.nix for Rust ```nix { inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11"; outputs = { self, nixpkgs }: let systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ]; forAllSystems = nixpkgs.lib.genAttrs systems; in { devShells = forAllSystems (system: let pkgs = nixpkgs.legacyPackages.${system}; in { default = pkgs.mkShell { packages = [ pkgs.rustc pkgs.cargo ]; }; }); }; } ``` ### Typical flake.nix for Python + uv ```nix { inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11"; outputs = { self, nixpkgs }: let systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ]; forAllSystems = nixpkgs.lib.genAttrs systems; in { devShells = forAllSystems (system: let pkgs = nixpkgs.legacyPackages.${system}; in { default = pkgs.mkShell { packages = [ pkgs.python312 pkgs.uv ]; }; }); }; } ``` ### Notes - Only `run:` steps are wrapped. `uses:` action steps are not affected. - Job `container:` steps skip nix wrapping (container has its own environment). - `nix develop` / `nix-shell` is invoked per step, so the nix environment is consistent across steps. ## Workflow Features - Push trigger filter (`branches`, `paths`) - `strategy.matrix` (axes, include, exclude, fail-fast, max-parallel) - Job/step `if` conditions (`success()`, `always()`, `failure()`, `cancelled()`) - `needs` dependencies with output/result propagation - Reusable workflows (`workflow_call`) with inputs, outputs, secrets, `secrets: inherit`, nested expansion - Job `container` and `services` with Docker networking - Expression functions: `contains`, `startsWith`, `endsWith`, `fromJSON`, `toJSON`, `hashFiles` - File commands: `GITHUB_ENV`, `GITHUB_PATH`, `GITHUB_OUTPUT`, `GITHUB_STEP_SUMMARY` - Shell support: `bash`, `sh`, `pwsh`, custom templates (`{0}`) - `step.continue-on-error`, `steps.*.outcome` / `steps.*.conclusion` ## Performance Benchmark on Apple Silicon (M-series): | Mode | Startup | CPU (Node.js) | Write 1k files | |------|--------:|--------------:|---------------:| | `local` | ~0.13s | 644ms | 52ms | | `nix-packages` | ~0.70s | 629ms | 47ms | | `apple-container` | ~0.93s | 502ms | **14ms** | - **local** — lowest overhead, best for fast iteration - **nix-packages** — +0.6s startup for `nix develop`; execution speed identical to local - **apple-container** — +0.9s startup; many-file I/O is 3-4x faster (ext4 vs APFS metadata) See [docs/perf.md](docs/perf.md) for full benchmark details. ```bash # Try it yourself nix run github:mizchi/actrun -- workflow run .github/workflows/ci.yml ``` ## Development ```bash just # check + test just fmt # format code just check # type check just test # run tests just e2e # run E2E scenarios just release-check # fmt + info + check + test + e2e just build-js # build the npm CLI bundle (dist/actrun.js) and library (lib/actrun.js) ``` ### Live Compatibility Testing ```bash # One-shot: dispatch, wait, download, compare just gha-compat-live compat-checkout-artifact.yml # Step by step just gha-compat-dispatch compat-checkout-artifact.yml just gha-compat-download <run-id> just gha-compat-compare compat-checkout-artifact.yml _build/gha-compat/<run-id> ``` ## Architecture | File | Purpose | |------|---------| | `src/lib.mbt` | Contract types | | `src/parser.mbt` | Workflow YAML parser | | `src/trigger.mbt` | Push trigger matcher | | `src/lowering.mbt` | Bitflow IR lowering, action/reusable workflow expansion | | `src/executor.mbt` | Native host executor | | `src/runtime.mbt` | Git workspace materialization | | `src/lint/` | Expression parser, type checker, dead code detection, workflow visualization | | `src/cmd/actrun/main.mbt` | CLI entry point | | `testdata/` | Compatibility fixtures | ## Prior Art - [actionlint](https://github.com/rhysd/actionlint) — Static checker for GitHub Actions workflow files. `actrun lint` is inspired by its rule design and type system. ## License Apache-2.0

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