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LGUG2Z
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Starting the demo guest by hand takes a build, a state directory, a password, a key, the sizes of the machine and the right arguments for its display, and a mistake shows up as an error from QEMU a minute later. `run-kde` does all of it: `nix run .#run-kde` (or `just run-kde`) checks the machine, builds the guest when its runner is not in the store, with the build log shown, makes the state directory with a sparse disk, a random RDP password and an ssh key (all mode 0600, none of it in the Nix store), and starts the runner with KVM, the memory and cores the machine has, the repository at /repo, and the state directory at /run/run-kde. It prints a banner with the RDP address and password, the ssh command, how to quit, and which graphics mode it chose and why. `--doctor` prints every prerequisite as a tick, a cross or a warning with the exact fix: WSL 2 or not, KVM and its group, nested virtualization, virtiofs (a virtiofsd started as the user with the options of the guest's runner must serve a directory, since the guest mounts its /nix/store through one; /dev/fuse is only a warning), memory, disk, WSLg, Windows interop, the GPU and the OpenGL of the host, and the lines of .wslconfig. It exits with 1 when something is a cross, which includes a missing KVM unless `--tcg` allows software emulation. The GPU is used when the display is a window, the host has a GPU device and its OpenGL is not llvmpipe, and `--gpu on|off` overrides it; on WSL 2, `--rdp` opens mstsc with a credential that lasts as long as the run. The script reads the machine through variables, so `--dry-run` and `--doctor` can be tested against machines that a check makes up: `run-kde-dry-run` and `run-kde-doctor` compare their output with the texts in nix/tests/run-kde, and the package, which shellchecks the script when it is built, is a check too.