Hi Ludo, I tried a variant of your change and nothing else, with a new guix checkout, like the following:
$ ./pre-inst-env guix system vm --no-graphic gnu/system/examples/bare-bones.tmpl I get (after running the output's run-vm.sh shell script and then logging in as "root" and then issuing "halt"): komputilo login: root This is the GNU operating system, welcome! root@komputilo ~# halt [ 18.881320] shepherd[1]: Terminating system log service. [ 18.883179] shepherd[1]: Service system-log stopped. [ 18.884346] shepherd[1]: Service system-log is now stopped. [ 18.885868] shepherd[1]: Closing 4 system log ports. [ 18.895855] shepherd[1]: Stopping service root-file-system... [ 18.901105] shepherd[1]: Service root-file-system stopped. [ 18.904446] shepherd[1]: Service root-file-system is now stopped. [ 18.915978] shepherd[1]: Stopping service pam... [ 18.917628] shepherd[1]: Service pam stopped. [ 18.918460] shepherd[1]: Service pam is now stopped. [ 18.921130] shepherd[1]: Stopping service log-rotation... [ 18.923183] shepherd[1]: Terminating timer 'log-rotation' with 0 processes running. [ 18.924316] shepherd[1]: Service log-rotation stopped. [ 18.925051] shepherd[1]: Service log-rotation is now stopped. [ 18.926610] shepherd[1]: Stopping service loopback... [ 18.930697] shepherd[1]: Registering new logger for loopback. [ 18.983130] shepherd[1]: Service loopback might have failed to stop. [ 18.983983] shepherd[1]: Service loopback is now stopped. [ 19.047604] ACPI: PM: Preparing to enter system sleep state S5 [ 19.048229] reboot: Power down Notably, no console log at all, nothing from lsof etc.