build_packages.yml

name: Build Packages

on:
  push:
    branches:
      - main
    tags:
      - '*'
  pull_request:

jobs:
  generate-matrix:
    name: Generate matrix for build
    runs-on: ubuntu-latest
    outputs:
      has-matrix: ${{ steps.set-matrix.outputs.has-matrix }}
      matrix: ${{ steps.set-matrix.outputs.matrix }}
      has-tag: ${{ steps.set-tag.outputs.has-tag }}
      tag: ${{ steps.set-tag.outputs.tag }}
    steps:
      - name: Determine fetch depth 
        run: echo "FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> "${GITHUB_ENV}"
      - uses: actions/checkout@v4
        with:
          path: eic-spack
          fetch-depth: ${{ env.FETCH_DEPTH }}
      - name: Set spack container tag
        id: set-tag
        run: |
          base_ref=${{ github.event.pull_request.base.ref || github.ref }}
          if [[ $base_ref =~ ^develop$ ]] ; then
            TAG=latest
          fi 
          if [[ $base_ref =~ ^releases/(v[0-9].[0-9]+)$ ]] ; then 
            TAG=${BASH_REMATCH[1]}.0
          fi
          if [ -n "$TAG" ] ; then
            HAS_TAG=true
          fi
          echo "tag=${TAG:-}" | tee -a $GITHUB_OUTPUT
          echo "has-tag=${HAS_TAG:-false}" | tee -a $GITHUB_OUTPUT
      - name: Set modified package matrix
        id: set-matrix
        run: |
          cd eic-spack
          echo "github.sha=${{ github.sha }}"
          echo "github.event.pull_request.head.sha=${{ github.event.pull_request.head.sha }}"
          echo "github.event.pull_request.base.sha=${{ github.event.pull_request.base.sha }}"
          git diff-tree --no-commit-id --name-only -r ${{ github.event.pull_request.head.sha || github.sha }} ${{ github.event.pull_request.base.sha }}
          CHANGED_PACKAGES=$(git diff-tree --no-commit-id --name-only -r ${{ github.event.pull_request.head.sha }} ${{ github.event.pull_request.base.sha }} | sed 's|^packages/||' | xargs -I {} dirname {} | uniq)
          JSON="{\"include\":["
          for pkg in ${CHANGED_PACKAGES} ; do
            if [ ! -d packages/$pkg ] ; then continue ; fi
            if [ ! -f packages/$pkg/package.py ] ; then continue ; fi
            # Add build to the matrix only if it is not already included
            JSONline="{\"pkg\": \"$pkg\"},"
            if [[ "$JSON" != *"$JSONline"* ]]; then
              JSON="$JSON$JSONline"
              HAS_MATRIX=true
            fi
          done
          
          # Remove last "," and add closing brackets
          if [[ $JSON == *, ]]; then
            JSON="${JSON%?}"
          fi
          JSON="$JSON]}"
          echo $JSON
          
          # Set output
          echo "matrix=$( echo "$JSON" )" | tee -a $GITHUB_OUTPUT
          echo "has-matrix=${HAS_MATRIX:-false}" | tee -a $GITHUB_OUTPUT

  concretize:
    name: Build ${{ matrix.pkg }}
    needs: generate-matrix
    if: needs.generate-matrix.outputs.has-matrix == 'true' && needs.generate-matrix.outputs.has-tag == 'true'
    strategy:
      fail-fast: false
      matrix: ${{fromJson(needs.generate-matrix.outputs.matrix)}}
    runs-on: ubuntu-latest
    container: ghcr.io/spack/ubuntu-jammy:${{needs.generate-matrix.outputs.tag}}
    steps:
      - uses: actions/checkout@v4
        with:
          path: key4hep-spack
          repository: key4hep/key4hep-spack      
      - uses: actions/checkout@v4
        with:
          path: eic-spack
      - name: Setup key4hep-spack and eic-spack repositories
        run: |
          . /opt/spack/share/spack/setup-env.sh
          spack repo add ${GITHUB_WORKSPACE}/key4hep-spack
          spack repo add ${GITHUB_WORKSPACE}/eic-spack
          spack repo list
      - name: Concretize package ${{ matrix.pkg }}
        run: |
          . /opt/spack/share/spack/setup-env.sh
          spack spec -I ${{ matrix.pkg }}