Snapcraft Multiarch Build Action

This is a Github Action that can be used to build a Snapcraft project. For most projects, the following workflow should be sufficient:

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
    - uses: diddlesnaps/snapcraft-multiarch-action@v1

This will run snapcraft using the snapcraft-container

On success, the action will set the snap output parameter to the path of the built snap. This can be used to save it as an artifact of the workflow:

...
    - uses: diddlesnaps/snapcraft-multiarch-action@v1
      id: snapcraft
    - uses: actions/upload-artifact@v2
      with:
        name: snap
        path: ${{ steps.snapcraft.outputs.snap }}

Alternatively, it could be used to perform further testing on the built snap:

    - run: |
        sudo snap install --dangerous ${{ steps.snapcraft.outputs.snap }}
        # do something with the snap

The action can also be chained with snapcore/action-publish@v1 to automatically publish builds to the Snap Store.

Multiple architectures support

This action supports building for multiple architectures using the GitHub Actions matrix feature.

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        platform:
        - i386
        - amd64
        - armhf
        - arm64
        - ppc64el
        - s390x
    steps:
    - uses: actions/checkout@v3
    - uses: docker/setup-qemu-action@v1
    - uses: diddlesnaps/snapcraft-multiarch-action@v1
      with:
        architecture: ${{ matrix.platform }}

notes

• s390x is broken at the moment.
• Builds for core20, and later, do not support i386 architecture because Ubuntu has dropped support for i386 in Ubuntu 20.04 and later.
• core builds do not support s390x architecture because Ubuntu does not have support for s390x before Ubuntu 18.04.

Action inputs

path

If your Snapcraft project is not located in the root of the workspace, you can specify an alternative location via the path input parameter:

...
    - uses: diddlesnaps/snapcraft-multiarch-action@v1
      with:
        path: path-to-snapcraft-project

use-podman

By default, this action will use Docker. If you are running a self-hosted GitHub Actions Runner then you might prefer to use Podman instead. This switch allows you to request experimental support for Podman to be used.

Note that when using Podman your build cannot target a CPU architecture that is different to the host your runner is based upon. This is a limitation of Podman. For example, you will need an ARM64 host to build an ARM64 Snap Package, when using Podman builds. Multiarch builds, where you build an i386 Snap on an AMD64 host or an ARMHF Snap on an ARM64 host, might be possible but are untested - your mileage might vary.

Set use-podman to true to use Podman instead of Docker.

build-info

By default, the action will tell Snapcraft to include information about the build in the resulting snap, in the form of the snap/snapcraft.yaml and snap/manifest.yaml files. Among other things, these are used by the Snap Store's automatic security vulnerability scanner to check whether your snap includes files from vulnerable versions of Ubuntu packages.

This can be turned off by setting the build-info parameter to false.

snapcraft-channel

By default, the action will install Snapcraft from the stable channel. If your project relies on a feature not found in the stable version of Snapcraft, then the snapcraft-channel parameter can be used to select a different channel.

snapcraft-args

The snapcraft-args parameter can be used to pass additional arguments to Snapcraft. This is primarily intended to allow the use of experimental features by passing --enable-experimental-* arguments to Snapcraft.

architecture

By default, the action will build for AMD64. You may use this parameter to indicate an alternative architecture from any of those supported by the snapcraft utility. At the time of writing the supported architectures are amd64, i386, arm64, armhf, ppc64el and s390x. This is most-useful when used with GitHub Actions' matrix feature.

### environment

Add environment variables to the Snapcraft build context. Each variable needs to be specified on a separate line. For example:

with:
  environment: |
    FOO=bar
    BAZ=qux

store-auth

Set the SNAPCRAFT_STORE_CREDENTIALS environment variable. This is useful when using the snapcraft push command.

You should not save the token into the yaml file directly, but use the GitHub Actions secrets feature:

with:
  store-auth: ${{ secrets.STORE_AUTH }}