name: ubuntu_build
on: [pull_request, push]
jobs:
  ubuntu_build:
    strategy:
      fail-fast: false
      matrix:
        python-version:
          - 3.7.10
          - 3.8.10
          - 3.9.5
          - 3.10.0
    runs-on: Ubuntu-20.04
    steps:
      - uses: actions/checkout@v2
      # Normally, we would use the superbly maintained...
      # - uses: actions/setup-python@v2
      #   with:
      #    python-version: ${{ matrix.python-version }}
      # ... but in the repo, we want to test pyenv builds on Ubuntu
      - run: |
          sudo apt-get install -y build-essential libssl-dev zlib1g-dev libbz2-dev \
              libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \
              xz-utils tk-dev libffi-dev liblzma-dev python-openssl git
      # https://github.com/pyenv/pyenv#installation
      - run: pwd
      - env:
          PYENV_ROOT: /home/runner/work/pyenv/pyenv
        run: |
          echo $PYENV_ROOT
          echo "$PYENV_ROOT/shims:$PYENV_ROOT/bin" >> $GITHUB_PATH
          bin/pyenv install ${{ matrix.python-version }}
          bin/pyenv global ${{ matrix.python-version }}
          bin/pyenv rehash
      - run: python --version
      - run: python -m pip --version
      - shell: python  # Prove that actual Python == expected Python
        env:
          EXPECTED_PYTHON: ${{ matrix.python-version }}
        run: import os, sys ; assert sys.version.startswith(os.getenv("EXPECTED_PYTHON"))