action.yml

# Copyright (c) 2022 OpenFaaS Ltd
name: 'get-kernel-sources'
description: 'Download the Kernel source to build a kmod or dmks in actuated'
branding:
  icon: 'arrow-right-circle'
  color: 'gray-dark'
  
inputs:
  cache:
    description: Whether to enable caching for the downloaded sources
    required: false
    default: 'true'
  
runs:
    using: 'composite'
    steps:
      - name: Install git if not present
        shell: bash
        run: |
           if ! [ -x "$(command -v git)" ]; then
            echo Installing git
            sudo apt update -qqqy && sudo apt install -qqqy git
           fi
      
      - name: Reset permissions of /usr/src for runner
        shell: bash
        run: |
          sudo chown -R runner:docker /usr/src

      - name: Store KERNEL_RELEASE
        shell: bash
        run: |
          echo "KERNEL_RELEASE=$(uname -r)" >> $GITHUB_ENV
      
      - name: Cache Kernel sources
        if: inputs.cache == 'true'
        id: cache-kernel-sources
        uses: actions/cache@v4
        with:
          path: |
            /usr/src/linux
          key: ${{ runner.os }}-${{ runner.arch }}-${{env.KERNEL_RELEASE}}     
           
      - name: Clone Kernel sources and link to /usr/src/linux
        shell: bash
        if: ${{ steps.cache-kernel-sources.outputs.cache-hit != 'true' }}
        run: |
          sudo mkdir -p /usr/src
          sudo git clone --depth 1 --branch v$KERNEL_RELEASE git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git /usr/src/linux

      - name: Create proper symlinks
        shell: bash
        run: |
          sudo rm /lib/modules/$KERNEL_RELEASE/build
          sudo ln -s /usr/src/linux-headers-$KERNEL_RELEASE/ /lib/modules/$KERNEL_RELEASE/build
          sudo rm /lib/modules/$KERNEL_RELEASE/source
          sudo ln -s /usr/src/linux-headers-$KERNEL_RELEASE/ /lib/modules/$KERNEL_RELEASE/source