1 files changed, 21 insertions, 0 deletions
diff --git a/nixos/modules/system/boot/kexec.nix b/nixos/modules/system/boot/kexec.nix
new file mode 100644
index 00000000000..b7821f9509f
--- /dev/null
+++ b/nixos/modules/system/boot/kexec.nix
@@ -0,0 +1,21 @@
+{ config, pkgs, ... }:
+
+{
+  environment.systemPackages = [ pkgs.kexectools ];
+
+  systemd.services."prepare-kexec" =
+    { description = "Preparation for kexec";
+      wantedBy = [ "kexec.target" ];
+      before = [ "systemd-kexec.service" ];
+      unitConfig.DefaultDependencies = false;
+      serviceConfig.Type = "oneshot";
+      path = [ pkgs.kexectools ];
+      script =
+        ''
+          p=$(readlink -f /nix/var/nix/profiles/system)
+          if ! [ -d $p ]; then exit 1; fi
+          exec kexec --load $p/kernel --initrd=$p/initrd --append="$(cat $p/kernel-params) init=$p/init"
+        '';
+    };
+
+}
\ No newline at end of file