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:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
      empty: ${{ steps.set-matrix.outputs.empty }}
    steps:
      - run: echo "FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> "${GITHUB_ENV}"
      - uses: actions/checkout@v3
        with:
          fetch-depth: ${{ env.FETCH_DEPTH }}
      - id: set-matrix
        run: |
          echo "github.sha=${{ 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)
          EMPTY=true
          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"
              EMPTY=false
            fi
          done
          
          # Remove last "," and add closing brackets
          if [[ $JSON == *, ]]; then
            JSON="${JSON%?}"
          fi
          JSON="$JSON]}"
          echo $JSON
          
          # Set output
          echo "matrix=$( echo "$JSON" )" >> $GITHUB_OUTPUT
          echo "empty=$EMPTY" >> $GITHUB_OUTPUT

  concretize:
    name: Build ${{ matrix.pkg }}
    needs: generate-matrix
    if: needs.generate-matrix.outputs.empty == 'false'
    strategy:
      fail-fast: false
      matrix: ${{fromJson(needs.generate-matrix.outputs.matrix)}}
    runs-on: ubuntu-latest
    container: ghcr.io/spack/ubuntu-jammy:${{ github.event.pull_request.base.ref || github.ref }}
    steps:
      - uses: actions/checkout@v3
      - name: Setup eic-spack repository
        run: |
          . /opt/spack/share/spack/setup-env.sh
          spack repo add $PWD
          spack repo list
      - name: Concretize package ${{ matrix.pkg }}
        run: |
          . /opt/spack/share/spack/setup-env.sh
          spack spec -I ${{ matrix.pkg }}