Subject: grep -q Portability
From: Richard Laager rlaager@wiktel.com Mon Aug 8 15:42:18 2011 -0500
Date: Tue Aug 9 11:33:31 2011 -0400:
Git: d078def94fda124304da95733d41844384e739ad

I don't think I've sent this one to the list yet.

The nc -q autodetection code fails if the target system's grep does not
have a -q argument (quite the ironic coincidence). I believe -q is
specified by POSIX, but Solaris 11's /bin/grep does not support -q.
Redirecting to /dev/null works portably. (In fact, this is even
recommended in favor of -q for portability by GNU grep's man page.)

This needs to be changed in virt-manager's src/virtManager/console.py.

Richard

Index: virt-manager-0.9.0/src/virtManager/console.py
===================================================================
--- virt-manager-0.9.0.orig/src/virtManager/console.py
+++ virt-manager-0.9.0/src/virtManager/console.py
@@ -93,7 +93,7 @@ class Tunnel(object):
             nc_params = "%s %s" % (gaddr, gport)
 
         nc_cmd = (
-            """nc -q 2>&1 | grep -q "requires an argument";"""
+            """nc -q 2>&1 | grep "requires an argument" >/dev/null;"""
             """if [ $? -eq 0 ] ; then"""
             """   CMD="nc -q 0 %(nc_params)s";"""
             """else"""