Automatically update Homebrew taps when you publish new releases to GitHub. Built with Probot.

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Usage

Firstly, you’ll need to install the Tap Release GitHub App. This listens out for any releases, or any changes to the configuration.

Then, add a .github/tap-release.yml configuration file to the GitHub repository where you publish new releases to.

For example, given the following .github/tap-release.yml file in a my-org/app/app.rb repository:

``yml
asset: app.zip
tap: my-org/homebrew-app/app.rb
template: |
class App < Formula
desc "$REPO_DESCRIPTION"
homepage "$REPO_WEBSITE"
version "$STABLE_VERSION"
url "$STABLE_ASSET_URL"
sha256 "$STABLE_ASSET_SHA256"

def install
prefix.install "app"
end
end
`

When a new release is published to my-org/app (e.g. v4.2.0), containing a app.zip asset, Tap Release would push a commit to the tap formula in the my-org/homebrew-app repository updating it to:

`rb
class App < Formula
desc "The best app ever."
homepage "https://github.com/my-org/app"
version "v2.4.0"
url "https://github.com/my-org/app/releases/download/v4.2.0/app.zip"
sha256 "f3832d8966dd39f7ae1316195ebb379cf18aece281bc2f7c43dd799130ebf460"

def install
prefix.install "app"
end
end
`

If you don't use release assets, you can also just use a URL pattern. For example, given the following template for a Node style tap:

`yml
url: "https://registry.npmjs.org/app/-/app-$VERSION_NUMBER.tgz"
tap: my-org/homebrew-app/app.rb
template: |
class App < Formula
desc "$REPO_DESCRIPTION"
homepage "$REPO_WEBSITE"
version "$STABLE_VERSION"
url "$STABLE_ASSET_URL"
sha256 "$STABLE_ASSET_SHA256"

# ...
end
`

When a new release is published (e.g. v4.2.0), Tap Release would push a commit to the tap formula in the my-org/homebrew-app repository updating it to:

`rb
class App < Formula
desc "The best app ever."
homepage "https://github.com/my-org/app"
version "v4.2.0"
url "https://registry.npmjs.org/app/-/app-4.2.0.tgz"
sha256 "f3832d8966dd39f7ae1316195ebb379cf18aece281bc2f7c43dd799130ebf460"

# ...
end
`

Template variables

You can use any of the following variables in your formula template, and they'll be substituted when the tap is regenerated:

|Variable|Description|
|-|-|
|$REPO_DESCRIPTION|GitHub repository description.|
|$REPO_WEBSITE|GitHub repository website, or URL if there isn't one.|
|$STABLE_VERSION|Tag name of the latest stable release (e.g. v1.0.2).|
|$STABLE_VERSION_NUMBER|Tag name of the latest stable release, without any preceding v (e.g. 1.0.2).|
|$STABLE_ASSET_URL|Download URL of the asset from the latest stable release.|
|$STABLE_ASSET_SHA256|SHA256 of the asset from the latest stable release.|
|$DEVEL_VERSION|Tag name of the latest pre-release (e.g. v2.0.0-beta.1).|
|$DEVEL_VERSION_NUMBER|Tag name of the latest pre-release, without any preceding v (e.g. 2.0.0-beta.1).|
|$DEVEL_ASSET_URL|Download URL of the asset from the latest pre-release.|
|$DEVEL_ASSET_SHA256|SHA256 of the asset from the latest pre-release.|

Asset & URL variables

You can use any of the following variables in the asset and url options, and they'll be substituted for each stable and development release when searching for assets or generating URLs:

|Variable|Description|
|-|-|
|$VERSION|The version (e.g. v1.0.2).|
|$VERSION_NUMBER|The version without the preceding v (e.g. 1.0.2).|

Configuration options

You can configure Tap Release using the following key in your .github/tap-release.yml file:

|Key|Required|Description|
|-|-|-|
|tap|Required|The path to the Homebrew tap repository that should be updated.|
|template|Required|The template string to use to generate the tap. Use variables to insert the values from the releases.|
|asset|Optional|Filename of the asset to use from the release.|
|url|Optional|URL pattern to generate the download URLs. Use URL variables to insert the values from the release.|
|branches|Optional|A list of branches that trigger the tap to be updated when the .github/tap-release.yml file is modified. Useful if you want to test the app on a pull request branch. Default is "master".|

Tap Release also supports Probot Config, if you want to store your configuration files in a central repository.

Developing

If you have Node v8+ installed locally, you can run the tests, and a local app, using the following commands:

`sh


Install dependencies

yarn

Run the tests

npm test

Run the app locally

npm start
`

If you don't have Node installed, you can use Docker Compose:

`sh


Run the tests


docker-compose run --rm app npm test
`

Contributing

Third-pary contributions are welcome! 🙏🏼 See CONTRIBUTING.md for step-by-step instructions.

If you need help or have a question, let me know via a GitHub issue.

Deployment

If you want to deploy your own copy of Tap Release, follow the Probot Deployment Guide.

Releasing

Run the following command:

`bash
git checkout master && git pull && npm version [major | minor | patch]
`

The command does the following:

* Ensures you’re on master and don't have local, un-commited changes
* Bumps the version number in package.json based on major, minor or patch
* Runs the postversion` npm script in package.json, which:
* Pushes the tag to GitHub
* Publishes the npm release
* Opens the GitHub releases page so you can publish the release notes