build-linux-artifacts.yml

name: Build Linux artifact

on:
  push:
    branches:
      - master
  workflow_dispatch:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  detect-file-change:
    runs-on: ubuntu-24.04
    steps:
      - name: Checkout repository
        uses: actions/checkout@v6
        with:
          submodules: 'true'
      - name: Test file change of Linux image
        id: test-linux-image-version-change
        uses: tj-actions/changed-files@v47
        with:
          files: |
            assets/system/configs/*
            tools/build-linux-image.sh
            mk/external.mk
            tests/system/br_pkgs/rtc/*.c
      - name: Set alias
        id: has_changed_files
        run: |
          if [[ ${{ steps.test-linux-image-version-change.outputs.any_modified }} == true ]]; then
            # Determine if the changes are from the Buildroot patching or the Buildroot or the Linux version
            # Others file changes need to trigger the rebuilt via workflow_dispatch event
            echo -n $(git --no-pager diff HEAD^ HEAD | grep \
                        -e "assets/system/configs/" \
                        -e "tools/build-linux-image.sh" \
                        -e "tests/system/br_pkgs/rtc/" \
                        -e "+BUILDROOT_VERSION" \
                        -e "+LINUX_VERSION" \
                        -e "+LINUX_PATCHLEVEL" \
                     ) >> linux-image-version-change
            if [[ -s linux-image-version-change ]]; then
                echo "has_changed_linux_image_version=true" >> $GITHUB_OUTPUT
            else
                echo "has_changed_linux_image_version=false" >> $GITHUB_OUTPUT
            fi
          else
            echo "has_changed_linux_image_version=false" >> $GITHUB_OUTPUT
          fi
    outputs:
      has_changed_linux_image_version: ${{ steps.has_changed_files.outputs.has_changed_linux_image_version }}

  build-linux-image-artifact:
    needs: [detect-file-change]
    if: ${{ needs.detect-file-change.outputs.has_changed_linux_image_version == 'true' || github.event_name == 'workflow_dispatch' }}
    runs-on: ubuntu-24.04
    steps:
      - name: Checkout repository
        uses: actions/checkout@v6
        with:
          submodules: 'true'
      - name: Install dependencies
        run: |
          sudo apt-get update -q=2
          sudo apt-get upgrade -q=2
          sudo apt-get install -q=2 build-essential git
      - name: Build Linux image
        run: |
          make build-linux-image
          make system_defconfig
          make artifact ENABLE_PREBUILT=0
      - name: Create tarball
        run: |
          cd /tmp
          tar -zcvf rv32emu-linux-image-prebuilt.tar.gz rv32emu-linux-image-prebuilt
      - name: Create GitHub Release
        env:
          GH_TOKEN: ${{ secrets.RV32EMU_PREBUILT_TOKEN }}
        run: |
          RELEASE_TAG="$(date +'%Y.%m.%d')-$(git rev-parse --short HEAD)-Linux-Image"
          cd /tmp
          gh release create --latest=false $RELEASE_TAG \
            --repo sysprog21/rv32emu-prebuilt \
            --title "$RELEASE_TAG"
          gh release upload $RELEASE_TAG \
            rv32emu-linux-image-prebuilt.tar.gz \
            sha1sum-linux-image \
            --repo sysprog21/rv32emu-prebuilt