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I need to run poetry version to get the pyproject.toml version on every push to master touching pyproject.toml. However, since Poetry is not installed on GitHub Actions runner virtual environments, I also need to install it before I can run any Poetry commands. I want to cache this tool installation so I don't have to install it on every run and use up Actions minutes. The only Poetry command I need to run is poetry version, so I'm not worried about the tool being outdated - it only needs to parse the pyproject.toml and get the project version number. I'm also not sure what to use as my key for the caching action - I assume it can be static

The desired order of operations would be something like:

  1. Check out repo.
  2. Check cache for Poetry. If it's not installed, install it.
  3. Run poetry version.
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The key input of actions/cache@v2 can be a string - provide it something arbitrary. The path input is the location of the tool.

Potential pitfalls:

  • Note that the path argument does NOT resolve environment variables like $HOME, but the tilde (~) can be used to signify the home directory.
  • Poetry has to be prepended to the PATH on every run, as default environment variables are not preserved between runs.
  • Poetry may complain that it's dropping support for Python2 soon - to ensure it's running with Python 3, make sure to setup the run with any of the Python 3 versions.
on: push: branches: - master paths: - 'pyproject.toml' jobs: pyproject-version: runs-on: 'ubuntu-latest' steps: - name: Checkout code uses: actions/checkout@v2 - name: Setup Python uses: actions/setup-python@v2 with: python-version: '3.7' # Perma-cache Poetry since we only need it for checking pyproject version - name: Cache Poetry id: cache-poetry uses: actions/cache@v2 with: path: ~/.poetry key: poetry # Only runs when key from caching step changes - name: Install latest version of Poetry if: steps.cache-poetry.outputs.cache-hit != 'true' run: | curl -sSL https://install.python-poetry.org | python - # Poetry still needs to be re-prepended to the PATH on each run, since # PATH does not persist between runs. - name: Add Poetry to $PATH run: | echo "$HOME/.poetry/bin" >> $GITHUB_PATH - name: Get pyproject version run: poetry version
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