109 lines
6 KiB
Markdown
109 lines
6 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)
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> "Think globally, <code>act</code> 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 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://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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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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To install with [Homebrew](https://brew.sh/), run:
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```brew install nektos/tap/act```
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Alternatively, you can use the following:
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```curl https://raw.githubusercontent.com/nektos/act/master/install.sh | sudo bash```
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If you are running Windows, download the [latest release](https://github.com/nektos/act/releases/latest) and add the binary in to your PATH.
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If you are running Arch Linux, you can install the [act](https://aur.archlinux.org/packages/act/) package with your favorite package manager:
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```yay -S act```
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# Commands
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```
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# List the actions
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act -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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# 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:
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| GitHub Runner | Docker Image |
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| --------------- | ------------ |
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| ubuntu-latest | [node:12.6-buster-slim](https://hub.docker.com/_/buildpack-deps) |
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| ubuntu-18.04 | [node:12.6-buster-slim](https://hub.docker.com/_/buildpack-deps) |
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| ubuntu-16.04 | [node:12.6-stretch-slim](https://hub.docker.com/_/buildpack-deps) |
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| windows-latest | `unsupported` |
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| windows-2019 | `unsupported` |
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| macos-latest | `unsupported` |
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| macos-10.15 | `unsupported` |
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These default images do not contain all the tools that GitHub Actions offers by default in their runners. 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 - this image is >18GB 😱***`
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To use a different image for the runner, use the `-P` option:
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```
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act -P ubuntu-latest=nektos/act-environments-ubuntu:18.04
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```
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# Secrets
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To run `act` with secrets, you can enter them interactively or supply them as environment variables. 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 environment variable is not defined, prompt the user for a value.
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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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```
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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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# 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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## Building from source
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* Install Go tools 1.11.4+ - (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 check`
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* Build and install: `make install`
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