Unable to force Bash on Windows (in GitHub CI)

[Kocal]

Hi,

I'm trying to use rust-parallel on Symfony UX to speed-up our CI when running Windows tests (https://github.com/symfony/ux/pull/2997/), where I want to merge these steps:

- name: Run packages tests (Unix)
  if: matrix.os != 'windows-latest'
  run: |
    source .github/workflows/.utils.sh
    echo "$PACKAGES" | xargs -n1 | parallel -j +3 "_run_task {} \
      '(cd src/{} \
      && $COMPOSER_MIN_STAB \
      && $COMPOSER_UP \
      && if [ {} = LiveComponent ]; then install_property_info_for_version \"${{ matrix.php-version }}\" \"${{ matrix.minimum-stability }}\"; fi \
      && $PHPUNIT)'"

- name: Run packages tests (Windows)
  if: matrix.os == 'windows-latest'
  run: |
    source .github/workflows/.utils.sh

    # parallel is not available on Windows, so we need to run the tests sequentially
    FAILED_PACKAGES=""
    for PACKAGE in $PACKAGES; do
      if ! PACKAGE="$PACKAGE" _run_task_sequential $PACKAGE \
        '(cd src/$PACKAGE \
        && $COMPOSER_MIN_STAB \
        && $COMPOSER_UP \
        && if [ "$PACKAGE" = "LiveComponent" ]; then install_property_info_for_version \"${{ matrix.php-version }}\" \"${{ matrix.minimum-stability }}\"; fi \
        && $PHPUNIT)'; then
        FAILED_PACKAGES="$FAILED_PACKAGES $PACKAGE"
      fi
    done

    if [ -n "$FAILED_PACKAGES" ]; then
      echo "The following packages failed:$FAILED_PACKAGES"
      exit 1
    fi

to a single step.

I think it follows issue https://github.com/aaronriekenberg/rust-parallel/issues/8, where I'm not able to run Bash when being on Windows (we use some Bash functions from .github/workflows/.utils.sh):

• if I pass --shell-path bash, I'm having an error /c: /c: Is a directory on Windows, because Self::default_shell_argument() is /c
• so I tried to pass --shell-path bash --shell-argument -c, but now I have the following error on Windows and Linux jobs:

error: unexpected argument '-c' found

  tip: to pass '-c' as a value, use '-- -c'

You can reproduce the issue with:

 echo "a b c" | xargs -n1 | rust-parallel -j 2 -s -r '(.+)' --shell-path bash --shell-argument -c "echo {1}"

And since I'm not seeing any examples or tests about --shell-argument usage, I don't know if I'm doing something wrong or if the current behavior is broken. 😕

Do you know what's happening?

Thanks!