Bug 570629

Summary: Remote driver client hangs when connecting to Debian/Ubuntu hosts
Product: [Community] Virtualization Tools Reporter: Marc Deslauriers <marc.deslauriers>
Component: libvirtAssignee: Libvirt Maintainers <libvirt-maint>
Status: CLOSED CURRENTRELEASE QA Contact:
Severity: medium Docs Contact:
Priority: low    
Version: unspecifiedCC: berrange, crobinso, eblake, xen-maint
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OS: Linux   
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Last Closed: 2012-04-18 19:46:39 UTC Type: ---
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Patch to autodetect netcat parameters none

Description Marc Deslauriers 2010-03-04 21:31:33 UTC 
Created attachment 397928 [details]
Patch to autodetect netcat parameters

Debian/Ubuntu hosts need to add "-q 0" to netcat to properly quit. A similar bug existed in virt-manager:

https://bugzilla.redhat.com/show_bug.cgi?id=517778

Attached is a patch for libvirt that uses the same technique as virt-manager now does to autodetect if the remote netcat tool needs the -q parameter.

Based on the following virt-manager commit:

http://hg.fedorahosted.org/hg/virt-manager/rev/1f781890ea4a
Comment 1 Cole Robinson 2010-03-04 22:53:16 UTC 
I posted a similar patch upstream last month:

https://www.redhat.com/archives/libvir-list/2010-February/msg00444.html

Danpb wasn't a fan of it (understandably) and suggested a long term approach of making a custom helper to drop in /usr/libexec so that we don't need to rely on 'nc'.

However, until that work is done, it would be nice if one of these patches could be applied.
Comment 2 Eric Blake 2012-04-18 19:46:39 UTC 
Fixed in 0.9.7 with this commit:

commit a2b5c57db83559d4fe32ee90fbb6685555388e06
Author: Guido Günther <agx>
Date:   Fri Jul 8 21:07:29 2011 +0200

    Autodetect if the remote nc command supports the -q option
    
    Based on a patch by Marc Deslauriers <marc.deslauriers>
    
    RH: https://bugzilla.redhat.com/show_bug.cgi?id=562176
    Ubuntu: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/517478
    Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=573172