Description
Description:
Installing Python 3.8 on macOS 15.5 on Apple Silicon fails when Rosetta is not installed.
It downloads from https://github.com/actions/python-versions/releases/download/3.8.10-8879978422/python-3.8.10-darwin-arm64.tar.gz which then fails with:
Execute installation script
Check if Python hostedtoolcache folder exist...
Creating Python hostedtoolcache folder...
Install Python binaries from prebuilt package
Error: installer: This package requires Rosetta 2 to be installed.
Please install Rosetta 2 and then try again.
`sudo softwareupdate --install-rosetta`
installer: Error - Python can’t be installed on this computer.
This is surprising because this is the universal2 build from Python.org… which shows that really the problem is the upstream builds.
Action version:
'actions/setup-python@v5.0.0' (SHA:0a5c61591373683505ea898e09a3ea4f39ef2b9c)
Platform:
- Ubuntu
- macOS
- Windows
Runner type:
- Hosted
- Self-hosted
Tools version:
All Python versions released prior to 1 January 2022. (i.e., Python < 3.9.10 and Python 3.10.0 and Python 3.10.1)
Repro steps:
Given a runner on a macOS device, on Apple Silicon, without Rosetta installed:
- uses: actions/setup-python@v5.0.0
with:
python-version: '3.8'Expected behavior:
I expected the found arm64 package to install without Rosetta.
Actual behavior:
See https://github.com/web-platform-tests/wpt/actions/runs/15570768473/job/43920472123.
As above:
Execute installation script
Check if Python hostedtoolcache folder exist...
Creating Python hostedtoolcache folder...
Install Python binaries from prebuilt package
Error: installer: This package requires Rosetta 2 to be installed.
Please install Rosetta 2 and then try again.
`sudo softwareupdate --install-rosetta`
installer: Error - Python can’t be installed on this computer.