verbosity for jack test

engine/start.py

@@ -194,11 +194,13 @@ def _is_jack_running():
     """Check for JACK"""
     import ctypes
     import os
-    silent = os.open(os.devnull, os.O_WRONLY)
+
-    stdout = os.dup(1)
+    if not args.verbose:
-    stderr = os.dup(2)
+        silent = os.open(os.devnull, os.O_WRONLY)
-    os.dup2(silent, 1) #stdout
+        stdout = os.dup(1)
-    os.dup2(silent, 2) #stderr
+        stderr = os.dup(2)
+        os.dup2(silent, 1) #stdout
+        os.dup2(silent, 2) #stderr
     cjack = ctypes.cdll.LoadLibrary("libjack.so.0")
     class jack_client_t(ctypes.Structure):
         _fields_ = []
@@ -210,8 +212,9 @@ def _is_jack_running():
     except ValueError: #NULL pointer access
         ret = False
     cjack.jack_client_close(ctypesJackClient)
-    os.dup2(stdout, 1) #stdout
+    if not args.verbose:
-    os.dup2(stderr, 2) #stderr
+        os.dup2(stdout, 1) #stdout
+        os.dup2(stderr, 2) #stderr
     return ret
 
 def checkJackOrExit(prettyName):