name: stable build directories

on:
  push:
    branches:
      - '[0-9]+.[0-9]+'

permissions:
  contents: read

jobs:
  regression:
    runs-on: ubuntu-latest
    env:
      TESTDIR: "manual tests/13 builddir upgrade"
    steps:
      - uses: actions/checkout@v3
      - name: install ninja
        run: sudo apt-get -y install build-essential ninja-build
      - name: Fetch tags and unshallow
        run: git fetch --unshallow --tags
      - name: Checkout latest release on this branch
        run: |
          cp -r "$TESTDIR" "$TESTDIR"-temp
          git checkout "$(git describe --abbrev=0)"
      - name: Configure with most recent tag
        run: ./meson.py setup "$TESTDIR"-temp builddir
      - name: Return to testing commit
        run: git checkout $GITHUB_SHA
      - name: check that everything still works
        run: |
          ./meson.py compile -C builddir
          ninja -C builddir test
          DESTDIR=pkg ninja -C builddir install
          ./meson.py introspect builddir --all