marionette: Add support for QEMU's "quit" command.

* gnu/build/marionette.scm (marionette-control): Don't wait for the
monitor prompt when the command was "quit".

diff --git a/gnu/build/marionette.scm b/gnu/build/marionette.scm
index bb018fc..61284b8 100644 (file)
--- a/gnu/build/marionette.scm
+++ b/gnu/build/marionette.scm
@@ -222,7 +222,8 @@ pcsys_monitor\")."
     (($ <marionette> _ _ monitor)
      (display command monitor)
      (newline monitor)
-     (wait-for-monitor-prompt monitor))))
+     ;; The "quit" command terminates QEMU immediately, with no output.
+     (unless (string=? command "quit") (wait-for-monitor-prompt monitor)))))
 
 (define* (marionette-screen-text marionette
                                  #:key