packages: let microvm-update-* bail out with elaborative exception

packages.nix

@@ -160,14 +160,11 @@ lib.attrsets.mapAttrs
           ssh ${target} "time nix-collect-garbage -d && time nix-store --optimise"
         '';
 
-        "microvm-update-${name}" = pkgs.writeScriptBin "microvm-update-${name}" ''
+        "microvm-update-${name}" = pkgs.writeScriptBin "microvm-update-${name}" (
+          if builtins.elem (hostConfig.c3d2.deployment.server or null) [ "server9" "server10" ]
+          then ''
             #!${pkgs.runtimeShell} -e
 
-          ${lib.optionalString (! builtins.elem (hostConfig.c3d2.deployment.server or null) [ "server9" "server10" ]) ''
-            echo "MicroVM must be configured to proper server" >&2
-            exit 1
-          ''}
-
             ${hostConfig.system.build.copyToServer} ${inputPaths}
 
             ${hostConfig.system.build.runOnServer} bash -e <<END
@@ -191,7 +188,9 @@ lib.attrsets.mapAttrs
 
             systemctl restart microvm@${name}.service
             END
-        '';
+          ''
+          else throw "${name} is not configured to run on microvm.nix. Is it a physical host or is it deployed in Skyflake?"
+        );
 
         "microvm-update-${name}-local" = pkgs.writeScriptBin "microvm-update-${name}" ''
           #!${pkgs.runtimeShell} -e