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modules/virtualisation/qemu-vm: always enable serial console

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Always enable both tty and serial console, but set preferred console
depending on cfg.graphical.
Even in qemu graphical mode, you can switch to the serial console via
Ctrl+Alt+3.

With that being done, you also don't need to specify
`systemd.services."serial-getty@ttyS0".enable = true;` either as described in
https://nixos.wiki/wiki/Cheatsheet#Building_a_service_as_a_VM_.28for_testing.29,
as systemd automatically spawns a getty on consoles passwd via cmdline.

This also means, vms built by 'nixos-rebuild build-vm' can simply be run
properly in nographic mode by appending `-nographic` to `result/bin/run-*-vm`,
without the need to explicitly add platform-specific QEMU_KERNEL_PARAMS.
This commit is contained in:
Florian Klink 2018-05-05 13:51:04 +02:00 committed by Tuomas Tynkkynen
parent 70c57fe363
commit d4468bedb5
1 changed files with 10 additions and 5 deletions
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15
nixos/modules/virtualisation/qemu-vm.nix
View file

@ -24,7 +24,11 @@ let
cfg = config.virtualisation;
qemuGraphics = lib.optionalString (!cfg.graphics) "-nographic";
kernelConsole = if cfg.graphics then "" else "console=${qemuSerialDevice}";
# enable both serial console and tty0. select preferred console (last one) based on cfg.graphics
kernelConsoles = let
consoles = [ "console=${qemuSerialDevice}" "console=tty0" ];
in lib.concatStringsSep " " (if cfg.graphics then consoles else reverseList consoles);
# XXX: This is very ugly and in the future we really should use attribute
# sets to build ALL of the QEMU flags instead of this mixed mess of Nix
@ -107,7 +111,7 @@ let
${mkDiskIfaceDriveFlag "0" "file=$NIX_DISK_IMAGE,cache=writeback,werror=report"} \
-kernel ${config.system.build.toplevel}/kernel \
-initrd ${config.system.build.toplevel}/initrd \
-append "$(cat ${config.system.build.toplevel}/kernel-params) init=${config.system.build.toplevel}/init regInfo=${regInfo}/registration ${kernelConsole} $QEMU_KERNEL_PARAMS" \
-append "$(cat ${config.system.build.toplevel}/kernel-params) init=${config.system.build.toplevel}/init regInfo=${regInfo}/registration ${kernelConsoles} $QEMU_KERNEL_PARAMS" \
''} \
$extraDisks \
${qemuGraphics} \
@ -247,9 +251,10 @@ in
default = true;
description =
''
Whether to run QEMU with a graphics window, or access
the guest computer serial port through the host tty.
'';
Whether to run QEMU with a graphics window, or in nographic mode.
Serial console will be enabled on both settings, but this will
change the preferred console.
'';
};
virtualisation.cores =