kmod-compatibility-checks.yml

name: kmod compatibility checks
on:
  pull_request:
    branches:
      - develop
      - main
  push:
    branches:
      - develop
      - main

jobs:
  get_debuntu_releases:
    runs-on: ubuntu-latest
    steps:
      - name: install dependencies
        run: |
          sudo apt-get update
          sudo apt-get -y install curl jq
      - name: calculate available releases
        # the following does:
        # - fetch all available tags for the "buildpack-deps" Docker image
        # - fetch all available Ubuntu and Debian releases (that are still hosted on the distros' archive servers)
        # - get the intersection of the tags and the releaess
        # - drop some releases (e.g. 'oldstable')
        # - format as a JSON array
        run: |
          echo matrix=$(true; (curl -s "https://hub.docker.com/v2/repositories/library/buildpack-deps/tags?page_size=1000" | jq -r '.results[] | .name' | sort -u; for url in http://archive.ubuntu.com/ubuntu; do curl -s "${url}/dists/" | grep "href=" | sed -e 's|.*a href="||' -e 's|".*||' -e 's|/$||'; done | sort -u; for d in unstable testing stable oldstable; do echo $d; done) | sort | uniq -d | while read x; do echo -n '"'${x}'" '; done | sed -e 's|^ *|[|' -e 's| *$|]|' -e 's|  *|,|g') | tee -a $GITHUB_OUTPUT
        id: set-matrix
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}

  kmod-compile:
    runs-on: ubuntu-latest
    needs: get_debuntu_releases
    strategy:
      matrix:
        series: ${{ fromJson(needs.get_debuntu_releases.outputs.matrix) }}
      fail-fast: false
    container: buildpack-deps:${{ matrix.series }}
    env:
      JOB_KNOWN_FAILURES: "3.13 3.16 3.19 4.2"
    steps:
      - uses: actions/checkout@v2

      - name: Compile against all available kernel header versions
        shell: bash
        run: |
          arch=$(dpkg --print-architecture)
          apt-get update --quiet;
          apt-get install --yes --no-install-recommends kmod
          for kver in $(apt-cache search 'linux-headers-.*-generic' | cut -d- -f3 | sort -u -V); do
            apt-cache search 'linux-headers-'"${kver}"'-.*-generic' | sort -V | awk '{print $1}';
          done | xargs apt-get install --yes --no-install-recommends || true
          for kver in $(apt-cache search "linux-headers-.*-${arch}" | cut -d- -f3 | sort -u -V); do
            apt-cache search 'linux-headers-'"${kver}"'-.*-'"${arch}" | sort -V  | awk '{print $1}';
          done | xargs apt-get install --yes --no-install-recommends || true

          failed=""
          succeeded=""
          for kver in /lib/modules/*/build; do
            test -d $kver || continue
            kver=${kver%/build}
            kver=${kver##*/}
            echo "=== Testing ${kver} ===";
            ret=$(make KERNELRELEASE="${kver}" >&2; echo $?);
            if [ ${ret} -eq 0 ]; then
              succeeded="${succeeded} ${kver}"
              modinfo v4l2loopback.ko;
            else
              case " ${JOB_KNOWN_FAILURES} " in
              *" ${kver%.*} "*)
                echo "#### Skipped known failure ${kver}";
                ;;
              *)
                if grep -qE "^(CONFIG_VIDEO_DEV|CONFIG_VIDEO_V4L2)=" "${kver}/.config"; then
                  echo "#### Unexpected failure ${kver}";
                  failed="${failed} ${kver}";
                else
                  echo "#### Skipped failure ${kver} (no v4l2 support)";
                fi;
                ;;
              esac;
            fi;
            make KERNELRELEASE="${kver}" clean || test ${ret} -ne 0
          done
          if [ "x${failed}" != "x" ]; then
            echo "#### Failed kernels: ${failed}";
            exit 1
          fi
          echo "#### Successful builds for kernels: ${succeeded}";