qemu-build.yml

name: Build QEMU

# Build a minimal QEMU (arm-softmmu only) and upload as a GitHub release.
# The test jobs in build.yml download this prebuilt binary instead of
# compiling QEMU from source on every run.
#
# Trigger manually or bump QEMU_VERSION to rebuild.

on:
  workflow_dispatch:
    inputs:
      qemu_version:
        description: 'QEMU version to build (e.g. 10.2.2)'
        required: true
        default: '10.2.2'

env:
  QEMU_VERSION: ${{ inputs.qemu_version || '10.2.2' }}

permissions:
  contents: write  # create releases

jobs:
  build:
    runs-on: ubuntu-24.04
    steps:
    - uses: actions/checkout@v6

    - name: Validate version format
      run: |
        if ! echo "${QEMU_VERSION}" | grep -qE '^[0-9]+\.[0-9]+\.[0-9]+$'; then
          echo "ERROR: Invalid QEMU_VERSION '${QEMU_VERSION}' (expected N.N.N)"
          exit 1
        fi

    - name: Install build dependencies
      run: |
        sudo apt-get update
        sudo apt-get install -y ninja-build pkg-config libglib2.0-dev libpixman-1-dev

    - name: Build QEMU ${{ env.QEMU_VERSION }} (arm-softmmu)
      run: |
        curl -fsSL "https://download.qemu.org/qemu-${QEMU_VERSION}.tar.xz" | tar xJ
        cd "qemu-${QEMU_VERSION}"
        ./configure \
          --target-list=arm-softmmu \
          --prefix=/opt/qemu \
          --disable-docs
        make -j$(nproc)
        sudo make install

    - name: Verify
      run: |
        /opt/qemu/bin/qemu-system-arm --version
        /opt/qemu/bin/qemu-system-arm -M help | awk '{print $1}' | grep -Fx b-l475e-iot01a

    - name: Package
      run: |
        tar -czf "qemu-${QEMU_VERSION}-arm-softmmu-linux-x86_64.tar.gz" -C /opt qemu

    - name: Create release
      env:
        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      run: |
        tag="qemu-v${QEMU_VERSION}"
        asset="qemu-${QEMU_VERSION}-arm-softmmu-linux-x86_64.tar.gz"

        # Upload to existing release, or create a new one.
        # Upload first so the old asset stays available until replaced.
        if gh release view "$tag" >/dev/null 2>&1; then
          gh release upload "$tag" "$asset" --clobber
        else
          gh release create "$tag" "$asset" \
            --title "QEMU ${QEMU_VERSION} (arm-softmmu, linux-x86_64)" \
            --notes "Prebuilt QEMU ${QEMU_VERSION} (arm-softmmu only) for CI test jobs."
        fi