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Merged
arcivanov merged 1 commit into from
Nov 2, 2026
Merged

Limit Homebrew Python setup to Python and its dependencies #21

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3 changes: 2 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -94,7 +94,8 @@ Python is installed via `actions/setup-python@v7`, unless Homebrew is requested.

#### Whether to Install Python with Homebrew

Install Python via Homebrew instead. This only has effect on MacOS.
Install Python via Homebrew instead. This only has effect on MacOS. Only `python@<version>` and its own
dependencies are installed or upgraded; other formulae already present on the runner are left as they are.

```yaml
homebrew-python:
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15 changes: 13 additions & 2 deletions action.yml
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Expand Up @@ -143,15 +143,26 @@ runs:
- name: Setup Python with Homebrew
shell: bash
if: inputs.install-python == 'true' && runner.os == 'macOS' && inputs.homebrew-python == 'true'
env:
# Only touch Python and its own dependencies, not every formula on the runner image
HOMEBREW_NO_AUTO_UPDATE: '1'
HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK: '1'
HOMEBREW_NO_INSTALL_CLEANUP: '1'
HOMEBREW_NO_ENV_HINTS: '1'
run: |
brew update
brew upgrade --overwrite
brew uninstall --force --ignore-dependencies 'python@${{ inputs.python-version }}' || true
# Dependencies that `brew install` upgrades implicitly are linked without `--overwrite`,
# so upgrade Python's outdated dependencies explicitly first
PYTHON_DEPS="$(brew deps 'python@${{ inputs.python-version }}')"
OUTDATED_DEPS="$(brew outdated --formula --quiet | grep -Fx -f <(echo "$PYTHON_DEPS") || true)"
if [ -n "$OUTDATED_DEPS" ]; then
brew upgrade --overwrite $OUTDATED_DEPS
fi
brew install --overwrite 'python@${{ inputs.python-version }}'
echo "/usr/local/opt/python@${{ inputs.python-version }}/Frameworks/Python.framework/Versions/${{ inputs.python-version }}/bin" >> $GITHUB_PATH
echo "/usr/local/opt/python@${{ inputs.python-version }}/libexec/bin" >> $GITHUB_PATH
echo "/usr/local/opt/python@${{ inputs.python-version }}/bin" >> $GITHUB_PATH
brew cleanup

- name: Python Pre-VENV Check
shell: bash
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