438 lines
20 KiB
Markdown
438 lines
20 KiB
Markdown
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# Overview [](https://github.com/nektos/act/actions) [](https://gitter.im/nektos/act?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [](https://goreportcard.com/report/github.com/nektos/act) [](https://github.com/jonico/awesome-runners)
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> "Think globally, `act` locally"
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Run your [GitHub Actions](https://developer.github.com/actions/) locally! Why would you want to do this? Two reasons:
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- **Fast Feedback** - Rather than having to commit/push every time you want to test out the changes you are making to your `.github/workflows/` files (or for any changes to embedded GitHub actions), you can use `act` to run the actions locally. The [environment variables](https://help.github.com/en/actions/configuring-and-managing-workflows/using-environment-variables#default-environment-variables) and [filesystem](https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners#filesystems-on-github-hosted-runners) are all configured to match what GitHub provides.
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- **Local Task Runner** - I love [make](<https://en.wikipedia.org/wiki/Make_(software)>). However, I also hate repeating myself. With `act`, you can use the GitHub Actions defined in your `.github/workflows/` to replace your `Makefile`!
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# How Does It Work?
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When you run `act` it reads in your GitHub Actions from `.github/workflows/` and determines the set of actions that need to be run. It uses the Docker API to either pull or build the necessary images, as defined in your workflow files and finally determines the execution path based on the dependencies that were defined. Once it has the execution path, it then uses the Docker API to run containers for each action based on the images prepared earlier. The [environment variables](https://help.github.com/en/actions/configuring-and-managing-workflows/using-environment-variables#default-environment-variables) and [filesystem](https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#file-systems) are all configured to match what GitHub provides.
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Let's see it in action with a [sample repo](https://github.com/cplee/github-actions-demo)!
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# Installation
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## Necessary prerequisites for running `act`
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`act` depends on `docker` to run workflows.
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If you are using macOS, please be sure to follow the steps outlined in [Docker Docs for how to install Docker Desktop for Mac](https://docs.docker.com/docker-for-mac/install/).
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If you are using Windows, please follow steps for [installing Docker Desktop on Windows](https://docs.docker.com/docker-for-windows/install/).
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If you are using Linux, you will need to [install Docker Engine](https://docs.docker.com/engine/install/).
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`act` is currently not supported with `podman` or other container backends (it might work, but it's not guaranteed). Please see [#303](https://github.com/nektos/act/issues/303) for updates.
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## Installation through package managers
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### [Homebrew](https://brew.sh/) (Linux/macOS)
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[](https://github.com/Homebrew/homebrew-core/blob/master/Formula/act.rb)
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```shell
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brew install act
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```
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or if you want to install version based on latest commit, you can run below (it requires compiler to be installed installed but Homebrew will suggest you how to install it, if you don't have it):
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```shell
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brew install act --HEAD
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```
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### [MacPorts](https://www.macports.org) (macOS)
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[](https://repology.org/project/act-run-github-actions/versions)
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```shell
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sudo port install act
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```
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### [Chocolatey](https://chocolatey.org/) (Windows)
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[](https://community.chocolatey.org/packages/act-cli)
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```shell
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choco install act-cli
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```
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### [Scoop](https://scoop.sh/) (Windows)
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[](https://github.com/ScoopInstaller/Main/blob/master/bucket/act.json)
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```shell
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scoop install act
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```
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### [AUR](https://aur.archlinux.org/packages/act/) (Linux)
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[](https://aur.archlinux.org/packages/act/)
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```shell
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yay -S act
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```
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### [COPR](https://copr.fedorainfracloud.org/coprs/rubemlrm/act-cli/) (Linux)
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```shell
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dnf copr enable rubemlrm/act-cli
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dnf install act-cli
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```
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### [Nix](https://nixos.org) (Linux/macOS)
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[Nix recipe](https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/tools/misc/act/default.nix)
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Global install:
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```sh
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nix-env -iA nixpkgs.act
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```
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or through `nix-shell`:
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```sh
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nix-shell -p act
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```
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Using the latest [Nix command](https://nixos.wiki/wiki/Nix_command), you can run directly :
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```sh
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nix run nixpkgs#act
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```
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## Other install options
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### Bash script
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Run this command in your terminal:
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```shell
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curl https://raw.githubusercontent.com/nektos/act/master/install.sh | sudo bash
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```
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### Manual download
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Download the [latest release](https://github.com/nektos/act/releases/latest) and add the path to your binary into your PATH.
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# Example commands
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```sh
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# Command structure:
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act [<event>] [options]
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If no event name passed, will default to "on: push"
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# List the actions for the default event:
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act -l
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# List the actions for a specific event:
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act workflow_dispatch -l
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# Run the default (`push`) event:
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act
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# Run a specific event:
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act pull_request
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# Run a specific job:
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act -j test
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# Run in dry-run mode:
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act -n
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# Enable verbose-logging (can be used with any of the above commands)
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act -v
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```
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## First `act` run
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When running `act` for the first time, it will ask you to choose image to be used as default.
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It will save that information to `~/.actrc`, please refer to [Configuration](#configuration) for more information about `.actrc` and to [Runners](#runners) for information about used/available Docker images.
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# Flags
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```none
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-a, --actor string user that triggered the event (default "nektos/act")
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--replace-ghe-action-with-github-com If you are using GitHub Enterprise Server and allow specified actions from GitHub (github.com), you can set actions on this. (e.g. --replace-ghe-action-with-github-com=github/super-linter)
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--replace-ghe-action-token-with-github-com If you are using replace-ghe-action-with-github-com and you want to use private actions on GitHub, you have to set personal access token
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--artifact-server-path string Defines the path where the artifact server stores uploads and retrieves downloads from. If not specified the artifact server will not start.
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--artifact-server-port string Defines the port where the artifact server listens (will only bind to localhost). (default "34567")
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-b, --bind bind working directory to container, rather than copy
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--container-architecture string Architecture which should be used to run containers, e.g.: linux/amd64. If not specified, will use host default architecture. Requires Docker server API Version 1.41+. Ignored on earlier Docker server platforms.
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--container-cap-add stringArray kernel capabilities to add to the workflow containers (e.g. --container-cap-add SYS_PTRACE)
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--container-cap-drop stringArray kernel capabilities to remove from the workflow containers (e.g. --container-cap-drop SYS_PTRACE)
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--container-daemon-socket string Path to Docker daemon socket which will be mounted to containers (default "/var/run/docker.sock")
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--defaultbranch string the name of the main branch
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--detect-event Use first event type from workflow as event that triggered the workflow
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-C, --directory string working directory (default ".")
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-n, --dryrun dryrun mode
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--env stringArray env to make available to actions with optional value (e.g. --env myenv=foo or --env myenv)
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--env-file string environment file to read and use as env in the containers (default ".env")
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-e, --eventpath string path to event JSON file
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--github-instance string GitHub instance to use. Don't use this if you are not using GitHub Enterprise Server. (default "github.com")
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-g, --graph draw workflows
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-h, --help help for act
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--insecure-secrets NOT RECOMMENDED! Doesn't hide secrets while printing logs.
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-j, --job string run job
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-l, --list list workflows
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--no-recurse Flag to disable running workflows from subdirectories of specified path in '--workflows'/'-W' flag
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-P, --platform stringArray custom image to use per platform (e.g. -P ubuntu-18.04=nektos/act-environments-ubuntu:18.04)
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--privileged use privileged mode
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-p, --pull pull docker image(s) even if already present
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-q, --quiet disable logging of output from steps
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--rebuild rebuild local action docker image(s) even if already present
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-r, --reuse don't remove container(s) on successfully completed workflow(s) to maintain state between runs
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--rm automatically remove container(s)/volume(s) after a workflow(s) failure
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-s, --secret stringArray secret to make available to actions with optional value (e.g. -s mysecret=foo or -s mysecret)
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--secret-file string file with list of secrets to read from (e.g. --secret-file .secrets) (default ".secrets")
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--use-gitignore Controls whether paths specified in .gitignore should be copied into container (default true)
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--userns string user namespace to use
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-v, --verbose verbose output
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-w, --watch watch the contents of the local repo and run when files change
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-W, --workflows string path to workflow file(s) (default "./.github/workflows/")
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```
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## `GITHUB_TOKEN`
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GitHub [automatically provides](https://docs.github.com/en/actions/security-guides/automatic-token-authentication#about-the-github_token-secret) a `GITHUB_TOKEN` secret when running workflows inside GitHub.
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If your workflow depends on this token, you need to create a [personal access token](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token) and pass it to `act` as a secret:
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```bash
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act -s GITHUB_TOKEN=[insert token or leave blank for secure input]
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```
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**WARNING**: `GITHUB_TOKEN` will be logged in shell history if not inserted through secure input or (depending on your shell config) the command is prefixed with a whitespace.
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# Known Issues
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## Services
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Services are not currently supported but are being worked on. See: https://github.com/nektos/act/issues/173
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## `MODULE_NOT_FOUND`
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A `MODULE_NOT_FOUND` during `docker cp` command [#228](https://github.com/nektos/act/issues/228) can happen if you are relying on local changes that have not been pushed. This can get triggered if the action is using a path, like:
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```yaml
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- name: test action locally
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uses: ./
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```
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In this case, you _must_ use `actions/checkout@v2` with a path that _has the same name as your repository_. If your repository is called _my-action_, then your checkout step would look like:
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```yaml
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steps:
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- name: Checkout
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uses: actions/checkout@v2
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with:
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path: "my-action"
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```
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If the `path:` value doesn't match the name of the repository, a `MODULE_NOT_FOUND` will be thrown.
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## `docker context` support
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The current `docker context` isn't respected ([#583](https://github.com/nektos/act/issues/583)).
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You can work around this by setting `DOCKER_HOST` before running `act`, with e.g:
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```bash
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export DOCKER_HOST=$(docker context inspect --format '{{.Endpoints.docker.Host}}')
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```
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# Runners
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GitHub Actions offers managed [virtual environments](https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners) for running workflows. In order for `act` to run your workflows locally, it must run a container for the runner defined in your workflow file. Here are the images that `act` uses for each runner type and size:
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| GitHub Runner | Micro Docker Image | Medium Docker Image | Large Docker Image |
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| --------------- | -------------------------------- | --------------------------------------------------------- | ---------------------------------------------------------- |
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| `ubuntu-latest` | [`node:16-buster-slim`][micro] | [`catthehacker/ubuntu:act-latest`][docker_images] | [`catthehacker/ubuntu:full-latest`][docker_images] |
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| `ubuntu-22.04` | [`node:16-bullseye-slim`][micro] | [`catthehacker/ubuntu:act-22.04`][docker_images] | `unavailable` |
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| `ubuntu-20.04` | [`node:16-buster-slim`][micro] | [`catthehacker/ubuntu:act-20.04`][docker_images] | [`catthehacker/ubuntu:full-20.04`][docker_images] |
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| `ubuntu-18.04` | [`node:16-buster-slim`][micro] | [`catthehacker/ubuntu:act-18.04`][docker_images] | [`catthehacker/ubuntu:full-18.04`][docker_images] |
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[micro]: https://hub.docker.com/_/buildpack-deps
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[docker_images]: https://github.com/catthehacker/docker_images
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Windows and macOS based platforms are currently **unsupported and won't work** (see issue [#97](https://github.com/nektos/act/issues/97))
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## Please see [IMAGES.md](./IMAGES.md) for more information about the Docker images that can be used with `act`
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## Default runners are intentionally incomplete
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These default images do **not** contain **all** the tools that GitHub Actions offers by default in their runners.
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Many things can work improperly or not at all while running those image.
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Additionally, some software might still not work even if installed properly, since GitHub Actions are running in fully virtualized machines while `act` is using Docker containers (e.g. Docker does not support running `systemd`).
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In case of any problems [please create issue](https://github.com/nektos/act/issues/new/choose) in respective repository (issues with `act` in this repository, issues with `nektos/act-environments-ubuntu:18.04` in [`nektos/act-environments`](https://github.com/nektos/act-environments) and issues with any image from user `catthehacker` in [`catthehacker/docker_images`](https://github.com/catthehacker/docker_images))
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## Alternative runner images
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If you need an environment that works just like the corresponding GitHub runner then consider using an image provided by [nektos/act-environments](https://github.com/nektos/act-environments):
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- [`nektos/act-environments-ubuntu:18.04`](https://hub.docker.com/r/nektos/act-environments-ubuntu/tags) - built from the Packer file GitHub uses in [actions/virtual-environments](https://github.com/actions/runner).
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:warning: :elephant: `*** WARNING - this image is >18GB 😱***`
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- [`catthehacker/ubuntu:full-*`](https://github.com/catthehacker/docker_images/pkgs/container/ubuntu) - built from Packer template provided by GitHub, see [catthehacker/virtual-environments-fork](https://github.com/catthehacker/virtual-environments-fork) or [catthehacker/docker_images](https://github.com/catthehacker/docker_images) for more information
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## Use an alternative runner image
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To use a different image for the runner, use the `-P` option.
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```sh
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act -P <platform>=<docker-image>
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```
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If your workflow uses `ubuntu-18.04`, consider below line as an example for changing Docker image used to run that workflow:
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```sh
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act -P ubuntu-18.04=nektos/act-environments-ubuntu:18.04
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```
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If you use multiple platforms in your workflow, you have to specify them to change which image is used.
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For example, if your workflow uses `ubuntu-18.04`, `ubuntu-16.04` and `ubuntu-latest`, specify all platforms like below
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```sh
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act -P ubuntu-18.04=nektos/act-environments-ubuntu:18.04 -P ubuntu-latest=ubuntu:latest -P ubuntu-16.04=node:16-buster-slim
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```
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# Secrets
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To run `act` with secrets, you can enter them interactively, supply them as environment variables or load them from a file. The following options are available for providing secrets:
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- `act -s MY_SECRET=somevalue` - use `somevalue` as the value for `MY_SECRET`.
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- `act -s MY_SECRET` - check for an environment variable named `MY_SECRET` and use it if it exists. If the environment variable is not defined, prompt the user for a value.
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- `act --secret-file my.secrets` - load secrets values from `my.secrets` file.
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- secrets file format is the same as `.env` format
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# Configuration
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You can provide default configuration flags to `act` by either creating a `./.actrc` or a `~/.actrc` file. Any flags in the files will be applied before any flags provided directly on the command line. For example, a file like below will always use the `nektos/act-environments-ubuntu:18.04` image for the `ubuntu-latest` runner:
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```sh
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# sample .actrc file
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-P ubuntu-latest=nektos/act-environments-ubuntu:18.04
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```
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Additionally, act supports loading environment variables from an `.env` file. The default is to look in the working directory for the file but can be overridden by:
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```sh
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act --env-file my.env
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```
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`.env`:
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```env
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MY_ENV_VAR=MY_ENV_VAR_VALUE
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MY_2ND_ENV_VAR="my 2nd env var value"
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```
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# Skipping steps
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Act adds a special environment variable `ACT` that can be used to skip a step that you
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don't want to run locally. E.g. a step that posts a Slack message or bumps a version number.
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```yml
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- name: Some step
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if: ${{ !env.ACT }}
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run: |
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...
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```
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# Events
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Every [GitHub event](https://developer.github.com/v3/activity/events/types) is accompanied by a payload. You can provide these events in JSON format with the `--eventpath` to simulate specific GitHub events kicking off an action. For example:
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```json
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{
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"pull_request": {
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"head": {
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"ref": "sample-head-ref"
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},
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"base": {
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"ref": "sample-base-ref"
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}
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}
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}
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```
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```sh
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act pull_request -e pull-request.json
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```
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Act will properly provide `github.head_ref` and `github.base_ref` to the action as expected.
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## Pass Inputs to Manually Triggered Workflows
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Example workflow file
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```yaml
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on:
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workflow_dispatch:
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inputs:
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NAME:
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description: "A random input name for the workflow"
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type: string
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SOME_VALUE:
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description: "Some other input to pass"
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type: string
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jobs:
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test:
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name: Test
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runs-on: ubuntu-latest
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steps:
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- name: Test with inputs
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run: |
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echo "Hello ${{ github.event.inputs.NAME }} and ${{ github.event.inputs.SOME_VALUE }}!"
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```
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Example JSON payload file conveniently named `payload.json`
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```json
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{
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"inputs": {
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"NAME": "Manual Workflow",
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"SOME_VALUE": "ABC"
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}
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}
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```
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Command for triggering the workflow
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```sh
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act workflow_dispatch -e payload.json
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```
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# GitHub Enterprise
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Act supports using and authenticating against private GitHub Enterprise servers.
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To use your custom GHE server, set the CLI flag `--github-instance` to your hostname (e.g. `github.company.com`).
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Please note that if your GHE server requires authentication, we will use the secret provided via `GITHUB_TOKEN`.
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Please also see the [official documentation for GitHub actions on GHE](https://docs.github.com/en/enterprise-server@3.0/admin/github-actions/about-using-actions-in-your-enterprise) for more information on how to use actions.
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# Support
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Need help? Ask on [Gitter](https://gitter.im/nektos/act)!
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# Contributing
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Want to contribute to act? Awesome! Check out the [contributing guidelines](CONTRIBUTING.md) to get involved.
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## Manually building from source
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- Install Go tools 1.18+ - (<https://golang.org/doc/install>)
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- Clone this repo `git clone git@github.com:nektos/act.git`
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- Run unit tests with `make test`
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- Build and install: `make install`
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