.github/workflows/cmake-required-version.yml

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# Copyright (c) 2022 Sebastian Pipping <sebastian@pipping.org>
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name: Ensure realistic minimum CMake version requirement

on:
  pull_request:
  push:
  schedule:
    - cron: '0 2 * * 5'  # Every Friday at 2am

jobs:
  checks:
    name: Ensure realistic minimum CMake version requirement
    runs-on: ubuntu-20.04
    steps:
    - uses: actions/checkout@v2.4.0

    - name: Install ancient CMake
      run: |
        set -ux

        needed_cmake_version="$(sed -n 's/cmake_minimum_required(VERSION \(.*\))/\1/p' expat/CMakeLists.txt)"

        installer_filename="cmake-${needed_cmake_version}-linux-x86_64.sh"
        download_url="https://github.com/Kitware/CMake/releases/download/v${needed_cmake_version}/${installer_filename}"
        wget --no-verbose "${download_url}"

        chmod +x "${installer_filename}"
        mkdir ~/.local/

        ./"${installer_filename}" --prefix="${HOME}"/.local/ --skip-license

        hash cmake  # or the running shell will keep using the cached old location
        present_cmake_version="$(cmake --version | sed -n 's/cmake version \(.*\)/\1/p')"
        [[ ${present_cmake_version} = ${needed_cmake_version} ]]

    - name: Build libexpat using ancient CMake
      run: |
        set -ux
        mkdir expat/build
        cd expat/build
        cmake --version
        cmake ..
        make VERBOSE=1 all test install DESTDIR="${PWD}/ROOT/"
        find ROOT/ -not -type d | sort