krops writeDeploy: add operation parameter

README.md

@@ -125,13 +125,17 @@ architecture.
 
 ### `fast` (optional, defaults to false)
 
-Run `nixos-rebuild switch` immediately without building the system
-in a dedicated `nix build` step.
+Run `nixos-rebuild` immediately without building the system in a dedicated `nix
+build` step.
 
 ### `force` (optional, defaults to false)
 
 Create the sentinel file (`/var/src/.populate`) before syncing the new source.
 
+### `operation` (optional, defaults to "switch")
+
+Specifies which `nixos-rebuild` operation to perform.
+
 ## writeTest
 
 Very similiar to writeDeploy, but just builds the system on the target without

pkgs/krops/default.nix

@@ -49,6 +49,7 @@ in
     crossDeploy ? false,
     fast ? null,
     force ? false,
+    operation ? "switch",
     source,
     target
   }: let
@@ -65,7 +66,7 @@ in
           (populate { inherit backup force source; target = buildTarget'; })}
         ${populate { inherit backup force source; target = target'; }}
         ${rebuild ([
-          "switch"
+          operation
         ] ++ lib.optionals crossDeploy [
           "--no-build-nix"
         ] ++ lib.optionals (buildTarget' != target') [