name: 'Setup Docker'
description: 'Prepare Docker for multi-platform image builds, freeing disk space on low-capacity runners'

runs:
  using: 'composite'

  steps:
    - run: df -h
      shell: bash

    - name: Check for old vm with low disk space
      id: check
      shell: bash
      run: |
        if [[ -e /dev/sdb1 ]]; then
          echo "::warning::We're on old vm, running cleanup"
          echo "do-cleanup=true" >> "$GITHUB_OUTPUT"
        else
          echo "::notice::We're on new vm, no cleanup required"
          echo "do-cleanup=false" >> "$GITHUB_OUTPUT"
        fi

    # Some runner vm's are smaller than others for unknown reasons
    # https://github.com/orgs/community/discussions/199328
    # To avoid disk space issues when performing a multi-platform docker build, we can clear up some disk space ahead of time
    - name: Free Disk Space
      if: ${{ steps.check.outputs.do-cleanup == 'true' }}
      uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be # v1.3.1
      with:
        # we're likely already using some of the globally installed tools
        tool-cache: false
        # there are no images by default
        docker-images: false
        # but we're definitely not using these
        android: true
        dotnet: true
        haskell: true
        # there is no swap storage anymore
        swap-storage: false

        large-packages: true # breaks docker cross platform support

    - run: df -h
      if: ${{ steps.check.outputs.do-cleanup == 'true' }}
      shell: bash

    - name: Set up containerd image store
      shell: bash
      run: |
        if [ ! -f /etc/docker/daemon.json ]; then
            echo "{}" | sudo tee /etc/docker/daemon.json
        fi
        cat /etc/docker/daemon.json | jq '. | .+{"features": {"containerd-snapshotter": true},"data-root": "/mnt/docker"}' | sudo tee /etc/docker/daemon.json
        sudo systemctl restart docker

    - name: Check docker service
      shell: bash
      run: |
        systemctl status docker

    - name: Check docker info
      shell: bash
      run: |
        docker info

    # allow build cross arch images
    - uses: docker/setup-qemu-action@1f40c72289eff860ee54a304f1438e3cff362e0a # v4.3.0