`mapfile: command not found` under macOS

[pbek]

Under macOS you will get the error mapfile: command not found if you'll try the CSV example to fix the problem with spaces in filenames.

[pbek]

The problem is that macOS has bash 3 and mapfile was introduced in bash 4.

I found a solution, add this step in front in your workflow:

    - if: contains( matrix.os, 'macos')
      name: Install bash 5.0 under macOS for mapfile
      run: |
        brew install bash
        sudo mv /usr/local/bin/bash /bin/bash

sudo mv /usr/local/bin/bash /bin/bash is needed because you cannot switch the default shell in a GitHub Workflow and you cannot switch the shell of a step to something else than the predefined shells.

[cyqsimon]

For whoever arrived here via a search:

Github actions now support custom shells:

• Set custom default shell actions/runner#240
• https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsshell