1 files changed, 22 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/system/boot/kexec.nix b/nixpkgs/nixos/modules/system/boot/kexec.nix
new file mode 100644
index 000000000000..61f9c6d0e7eb
--- /dev/null
+++ b/nixpkgs/nixos/modules/system/boot/kexec.nix
@@ -0,0 +1,22 @@
+{ pkgs, lib, ... }:
+
+{
+  config = lib.mkIf (lib.any (lib.meta.platformMatch pkgs.stdenv.hostPlatform) pkgs.kexectools.meta.platforms) {
+    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"
+          '';
+      };
+  };
+}