bsdinstall(8): add desktop script

[asiciliano]

Summary

Add a desktop script to install and set up a graphical environment. The current goal is to provide a simple option in bsdinstall to install the GPU driver, SDDM, and KDE. I have received some requests for additional functionality, such as allowing users to choose the display manager instead of SDDM due to potential future issues; it is not yet clear whether the KDE project will continue developing its main display manager without systemd.

Obviously, if there are requests, more options and graphical environments can be added in the future.

Sponsored by: The FreeBSD Foundation

Test Plan

The main testing challenge has been the large number of existing GPUs. I only have access to a recent laptop with an AMD GPU and an older 2011 laptop with NVIDIA Optimus (NVIDIA GPU + Intel GPU).

The call for testing has been very helpful, https://github.com/alfonsosiciliano/kde-installer-dialogs/blob/main/cft.md

[jrtc27]

I can't help but feel a lot of this belongs in packages rather than being big splats of hard-coded config that bsdinstall writes out that risks getting stale when ports gets updated

usr.sbin/bsdinstall/scripts/desktop

21

I did $3 >= 1000 && $3 < 32000 in CheriBSD, since there is an upper limit too above which you're back to system users.

56

Don't we force this non-empty elsewhere?

91

Arm + BIOS?..

[jrtc27]

usr.sbin/bsdinstall/scripts/desktop

93

I don't think this is true? You can get drm-kmod for arm64? (And drm-subtree if you vendor it in your tree)

[david_ixit.cz]

usr.sbin/bsdinstall/scripts/desktop

91

What I recall I saw some aarch64 board with BIOS, it's not extra common, but also not rare.