action.yml

name: "multistrap install"
description: "Install a system root using multistrap"
inputs:
  arch:
    description: "Target arch"
    required: true
  packages:
    description: "Extra packages to install"
    required: false
    default: ""
runs:
  using: "composite"
  steps:
    - id: install_multistrap
      run: |
        sudo apt-get update -y
        sudo apt-get install -y --no-install-recommends multistrap qemu-user-static
      shell: bash
    - id: create_chroot
      run: |
        set -xe

        multistrap_conf=""
        if [ "${{ inputs.arch }}" = "armv7" ]; then
          multistrap_conf=multistrap_raspbian_buster.conf
          wget http://archive.raspbian.org/raspbian/pool/main/r/raspbian-archive-keyring/raspbian-archive-keyring_20120528.2_all.deb && sudo dpkg -i raspbian-archive-keyring_20120528.2_all.deb
        fi
        if [ "${{ inputs.arch }}" = "aarch64" ]; then
          multistrap_conf=multistrap_armbian64_buster.conf
        fi

        # Retry 2 times because Rasbian mirrors are often failing
        if ! multistrap -d ${{ env.SYSTEM_RASPBIAN }} -f ${{ github.workspace }}/native_client/${multistrap_conf}; then
          if ! multistrap -d ${{ env.SYSTEM_RASPBIAN }} -f ${{ github.workspace }}/native_client/${multistrap_conf}; then
            multistrap -d ${{ env.SYSTEM_RASPBIAN }} -f ${{ github.workspace }}/native_client/${multistrap_conf}
          fi
        fi

        if [ ! -z "${{ inputs.packages }}" ]; then
          TO_MOUNT=${{ github.workspace }}
          # Prepare target directory to bind-mount the github tree
          mkdir -p ${{ env.SYSTEM_RASPBIAN }}/${{ github.workspace }}

          # Bind-mount so that we have the same tree inside the chroot
          for dev in ${TO_MOUNT};
          do
            sudo mount -o bind ${dev} ${{ env.SYSTEM_RASPBIAN }}${dev}
          done;

          # Copy some host data:
          #   resolv.conf: for getting DNS working
          #   passwd, group, shadow: to have user accounts and apt-get install working
          for ff in resolv.conf passwd group shadow;
          do
            sudo cp /etc/${ff} ${{ env.SYSTEM_RASPBIAN }}/etc/
          done;

          # Perform apt steps.
          # Preserving the env is required
          sudo --preserve-env chroot ${{ env.SYSTEM_RASPBIAN }}/ apt-get update -y
          sudo --preserve-env chroot ${{ env.SYSTEM_RASPBIAN }}/ apt-get install -y --no-install-recommends ${{ inputs.packages }}

          # Cleanup apt info to save space
          sudo --preserve-env chroot ${{ env.SYSTEM_RASPBIAN }}/ rm -fr /var/cache/apt/* /var/lib/apt/lists/*

          # Unmount what has been mounted
          for dev in ${TO_MOUNT};
          do
            sudo umount ${{ env.SYSTEM_RASPBIAN }}${dev}
          done;
        fi
      shell: bash