am 7c386a61: Merge "Extend and document the "wait" command"

* commit '7c386a610d9164c12932452d1ff671e070956ec1':
  Extend and document the "wait" command

init/builtins.c

@@ -799,6 +799,8 @@ int do_wait(int nargs, char **args)
 {
     if (nargs == 2) {
         return wait_for_file(args[1], COMMAND_RETRY_TIMEOUT);
-    }
-    return -1;
+    } else if (nargs == 3) {
+        return wait_for_file(args[1], atoi(args[2]));
+    } else
+        return -1;
 }

init/readme.txt

@@ -207,6 +207,11 @@ trigger <event>
    Trigger an event.  Used to queue an action from another
    action.
 
+wait <path> [ <timeout> ]
+  Poll for the existence of the given file and return when found,
+  or the timeout has been reached. If timeout is not specified it
+  currently defaults to five seconds.
+
 write <path> <string> [ <string> ]*
    Open the file at <path> and write one or more strings
    to it with write(2)