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Heroku buildpack: swift

This buildpack is not recommended for use. Instead consider using Heroku's container runtime along with the Swift container images.

For example a Dockerfile:

FROM docker.io/swift:5.5 as build

WORKDIR /usr/src/app

COPY Package.swift Package.resolved ./
COPY Sources Sources
COPY Tests Tests
RUN swift build --configuration release
RUN swift test --configuration release


FROM docker.io/swift:5.5-slim

# Copy the build executable target (named in Package.swift)
COPY --from=build /usr/src/app/.build/release/server .
CMD ./server $PORT

Build and push the image to Heroku's registry:

$ heroku container:push web

Then release the image:

$ heroku container:release web

Buildpack Usage

For historical purposes, below are the usage for the buildpack. Although its use is discouraged.

Example usage:

$ ls
Procfile Package.swift Sources

$ heroku create --buildpack kyle/swift

$ 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 kyle/swift

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.

Using the latest buildpack code

The kyle/swift buildpack from the Heroku Registry represents the latest stable version of the buildpack. If you'd like to use the latest buildpack code from this Github repository, you can set your buildpack to the GitHub URL:

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

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Heroku build pack for Swift

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