users/services: s6: `exec` into the run/finish commands

modules/users/s6-rc.nix

@@ -73,35 +73,33 @@ let
   serviceToFs'= {
     name,
     type,
-    contents ? null,
-    run ? null,
+    consumerFor ? null,
+    contents ? null,  #< bundle contents
     depends ? [],
     finish ? null,
     producerFor ? null,
-    consumerFor ? null,
+    run ? null,
   }: {
     "${name}".dir = {
       "type".text = type;
-      # TODO: finish and run should `exec` into their cli
-      "finish".executable = maybe (finish != null) ''
-        #!/bin/sh
-        ${finish}
-      '';
-      "run".executable = maybe (run != null) ''
-        #!/bin/sh
-        echo "starting: s6-${name}"
-        ${run} 2>&1
-      '';
       "contents".text = maybe (contents != null) (
         lib.concatStringsSep "\n" contents
       );
-      # TODO: a bundle can also have dependencies
+      "consumer-for".text = maybe (consumerFor != null) consumerFor;
       "dependencies.d".dir = lib.genAttrs
         depends
         (dep: { text = ""; })
       ;
-      "consumer-for".text = maybe (consumerFor != null) consumerFor;
+      "finish".executable = maybe (finish != null) ''
+        #!/bin/sh
+        exec ${finish}
+      '';
       "producer-for".text = maybe (producerFor != null) producerFor;
+      "run".executable = maybe (run != null) ''
+        #!/bin/sh
+        echo "starting: s6-${name}"
+        exec ${run} 2>&1
+      '';
     };
   };