test_manylinux.yml

name: manylinux-compatibility

# Ensure that cylc-flow remains installable with manylinx1 binaries for use
# with older systems.

# Ideally we would use the Docker images from PyPa
# (https://github.com/pypa/manylinux).
# The manylinux1 image is based on CentOS=5, glibc=2.5), however, this is so
# old that installing contemporary Python on them is quite hard:
# * native package manager has no package for CentOS5
# * miniforge can't work with glibc < 2.12
# * micromamba can't work with glibc < 2.6
# * need zlib to compile Python / install pip but the package manager can't
#   download it because the package stream is offline (past EOL)

# So this will have to do. This isn't a perfect test as non manylinux compat
# packages may attempt to compile from source. This might succeed here but not
# on an older host.

on:
  workflow_dispatch:
  pull_request:
    paths:
      - 'setup.py'
      - 'setup.cfg'
      - '.github/workflows/test_manylinux.yml'

jobs:
  test:
    runs-on: ${{ matrix.os }}
    timeout-minutes: 40
    strategy:
      fail-fast: false
      matrix:
        manylinux: ['1']
        os: ['ubuntu-20.04']  # run on the oldest linux we have access to
        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Configure git  # Needed by the odd test
        uses: cylc/release-actions/configure-git@v1

      - name: Configure Python
        uses: actions/setup-python@v4
        with:
          python-version: ${{ matrix.python-version }}

      - name: Downgrade PIP
        run: |
          # pip v22+ will fail on error rather than falling back to the
          # previous release
          # the old behaviour is better for this check
          if (( $(pip --version | sed 's/pip \([0-9]*\).*/\1/') >= 22 ))
          then
            pip install 'pip<22'
          fi

      - name: Configure Manylinux Compatibility
        # Make this platform look older than it is. For info see:
        # https://stackoverflow.com/questions/37231799/
        # exclude-manylinux-wheels-when-downloading-from-pip
        run: |
          cat > _manylinux.py <<__HERE__
          manylinux1_compatible = False
          manylinux2010_compatible = False
          manylinux2014_compatible = False
          __HERE__
          echo \
            "manylinux${{ matrix.manylinux }}_compatible = True" \
            >> _manylinux.py

      - name: Install
        timeout-minutes: 35
        run: |
          PYTHONPATH="$PWD:$PYTHONPATH" pip install ."[all]"

      - name: Test Import
        shell: python
        run: |
          import cylc.flow
          import cylc.flow.scheduler

      - name: Test
        timeout-minutes: 5
        run: |
          pytest -n 5