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modules/nixos/common/reboot: add kexec

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This commit is contained in:
zowoq 2024-05-09 15:14:57 +10:00
parent 27d30ede8d
commit 654f4190df
1 changed files with 8 additions and 3 deletions

11
modules/nixos/common/reboot.nix
View file

@ -1,15 +1,20 @@
{ config, pkgs, ... }:
{
# adapted from https://github.com/NixOS/nixpkgs/blob/3428bdf3c93a7608615dddd44dec50c3df89b4be/nixos/modules/tasks/auto-upgrade.nix
# adapted from:
# https://github.com/NixOS/nixpkgs/blob/3428bdf3c93a7608615dddd44dec50c3df89b4be/nixos/modules/system/boot/kexec.nix
# https://github.com/NixOS/nixpkgs/blob/3428bdf3c93a7608615dddd44dec50c3df89b4be/nixos/modules/tasks/auto-upgrade.nix
systemd.services.reboot-after-update = {
restartIfChanged = false;
unitConfig.X-StopOnRemoval = false;
serviceConfig.Type = "oneshot";
path = [ config.systemd.package pkgs.coreutils ];
path = [ config.systemd.package pkgs.coreutils pkgs.kexec-tools ];
script = ''
booted="$(readlink /run/booted-system/{initrd,kernel,kernel-modules} && cat /run/booted-system/kernel-params)"
built="$(readlink /nix/var/nix/profiles/system/{initrd,kernel,kernel-modules} && cat /nix/var/nix/profiles/system/kernel-params)"
p="$(readlink -f /nix/var/nix/profiles/system)"
built="$(readlink $p/{initrd,kernel,kernel-modules} && cat $p/kernel-params)"
if [ "''${booted}" != "''${built}" ]; then
# don't use kexec if system is virtualized
systemd-detect-virt -q || kexec --load $p/kernel --initrd=$p/initrd --append="$(cat $p/kernel-params) init=$p/init"
systemctl reboot
fi
'';