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Heroku buildpack: swift

This is a Heroku buildpack for Swift apps that are powered by the Swift Package Manager.

Check out the Curassow-example-helloworld for a fully working example that can be deployed to Heroku.

Usage

Example usage:

$ ls
Procfile Package.swift Sources

$ heroku create --buildpack https://github.com/kylef/heroku-buildpack-swift.git

$ git push heroku master
remote: -----> Swift app detected
remote: -----> Installing Swift 4.1
remote: -----> Installing clang-3.7.0
remote: -----> Building Package
remote: -----> Copying binaries to 'bin'

You can also add it to upcoming builds of an existing application:

$ heroku buildpacks:set https://github.com/kylef/heroku-buildpack-swift.git

The buildpack will detect your app as Swift if it has a Package.swift file in the root.

Procfile

Using the Procfile, you can set the process to run for your web server. Any binaries built from your Swift source using swift package manager will be placed in your $PATH.

web: HelloWorld --workers 3 --bind 0.0.0.0:$PORT

Specify a Swift version

You can also customise the version of Swift used with a .swift-version file in your repository:

$ cat .swift-version
4.1

The .swift-version file is completely compatible with swiftenv.

NOTE: Since there are frequent Swift language changes, it's advised that you pin to your Swift version.

Hooks

You can place custom scripts to be ran before and after compiling your Swift source code inside the following files in your repository:

  • bin/pre_compile
  • bin/post_compile

This is useful if you would need to install any other dependencies.