name: Build Kernel

on:
  pull_request:
    paths:
      - '.github/workflows/check-kernel-patches.yml'
      - '.github/workflows/build.yml'
      - '.github/workflows/kernel.yml'
      - 'include/kernel*'
      - 'package/kernel/**'
      - 'target/linux/generic/**'
  push:
    paths:
      - '.github/workflows/check-kernel-patches.yml'
      - '.github/workflows/build.yml'
      - '.github/workflows/kernel.yml'
      - 'include/kernel*'
      - 'package/kernel/**'
      - 'target/linux/generic/**'

permissions:
  contents: read

jobs:
  determine_targets:
    name: Set targets
    runs-on: ubuntu-latest
    outputs:
      target: ${{ steps.find_targets.outputs.target }}

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Set targets
        id: find_targets
        run: |
          export TARGETS="$(perl ./scripts/dump-target-info.pl targets 2>/dev/null \
            | sort -u -t '/' -k1,1 \
            | awk '{ print $1 }')"

          JSON='['
          FIRST=1
          for TARGET in $TARGETS; do
            [[ $FIRST -ne 1 ]] && JSON="$JSON"','
            JSON="$JSON"'"'"${TARGET}"'"'
            FIRST=0
          done
          JSON="$JSON"']'

           echo -e "\n---- targets ----\n"
           echo "$JSON"
           echo -e "\n---- targets ----\n"

           echo "target=$JSON" >> $GITHUB_OUTPUT

  build:
    name: Build Kernel with external toolchain
    needs: determine_targets
    permissions:
      contents: read
      packages: read
    strategy:
       fail-fast: False
       matrix:
         target: ${{fromJson(needs.determine_targets.outputs.target)}}
    uses: ./.github/workflows/build.yml
    with:
      target: ${{ matrix.target }}
      build_kernel: true
      build_all_kmods: true

  check-kernel-patches:
    name: Check Kernel patches
    needs: determine_targets
    permissions:
      contents: read
      packages: read
    strategy:
       fail-fast: False
       matrix:
         target: ${{fromJson(needs.determine_targets.outputs.target)}}
    uses: ./.github/workflows/check-kernel-patches.yml
    with:
      target: ${{ matrix.target }}