qemu should no longer be the default for 'colima start'

[pastelmind]

I recently updated colima to v0.8.0 (using Homebrew) and couldn't start colima because qemu was no longer installed on my system. (I'm afraid I don't have the error message.) From #1188 I believe lima doesn't require qemu anymore?

Apparently, sometime in the past, I had followed the instructions on README.md and ran colima delete && colima start. This caused my colima to use qemu. I suppose anyone who follows the README like me would be confused because they, too, will be using qemu, which must be installed separately.

Maybe we could change the default for --vm-type to vz? Or perhaps detect whether qemu is available and fallback to vz otherwise.

Alternatively, we could add a section in the README to tell people to manually install qemu or use vz. A FAQ item would be nice, too.

[abiosoft]

Your issue is most likely due to having a template previously set with colima template.
QEMU is no longer the default when it is missing.

[abiosoft]

Is that related to the fact I am running on a macOS version prior to macOS 13?

Yes

[mlbiche]

Thank you. So it is required to use qemu on macOS < 13?

[abiosoft]

Thank you. So it is required to use qemu on macOS < 13?

Yes, sadly. VZ is only supported from macOS 13.

[mlbiche]

May I suggest an update to the README.md? I don't know the contributing policy but I would be pleased to clarify this point.

[abiosoft]

@mlbiche feel free to open a PR against the readme or FAQ.