[Pkg-libvirt-maintainers] Bug#591936: [libvirt0] connect to remote kvm might fail (and probably also local), due to nc

[Martin Braure de Calignon]

Package: libvirt0
Version: 0.8.2-1
Severity: normal

--- Please enter the report below this line. ---
Hello,

I had a problem on my machine, trying to connect to a remote server.
Using virt-manager, I had a new remove ssh server, given a user at host address.
But then it failed. In debug, I saw the following message:

** begin message **
Uncaught Error: Unable to open a connection to the libvirt management daemon.

Libvirt URI is: qemu+ssh://user@host/system

Verify that:
 - The 'libvirtd' daemon has been started
 : Unable to open connection to hypervisor URI 'qemu+ssh://mbraure@devqual2.beepntrack.com/system':
server closed connection: nc: invalid option -- q
usage: nc [-46DdhklnrStUuvzC] [-i interval] [-p source_port]
	  [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_version]
	  [-x proxy_address[:port]] [hostname] [port[s]]

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/connection.py", line 971, in _try_open
    None], flags)
  File "/usr/lib/python2.6/dist-packages/libvirt.py", line 111, in openAuth
    if ret is None:raise libvirtError('virConnectOpenAuth() failed')
libvirtError: server closed connection: nc: invalid option -- q
usage: nc [-46DdhklnrStUuvzC] [-i interval] [-p source_port]
	  [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_version]
	  [-x proxy_address[:port]] [hostname] [port[s]]


Maybe you need to install ssh-askpass in order to authenticate.
** end message **


Of course, ssh-askpass was installed. Seeing the error, I check the nc command on the
remote machine, and there is no "-q" option. Suppress the "q" option in the source code 
src/remote/remote_driver.c and it work like a charm.
I think the same problem can occured in local as there's also a "nc" call in the qemu_driver.

One simple test (but I do not have any virtual machine on this computer) should be to
update-alternative --config nc and choose the BSD version rather than the nc.traditional,
as this one does not have (I think) any -q option.

Perhaps I've done something wrong, but I'm sure that removing the -q option from the "remote_driver.c"
makes virt-manager working perfectly.


Cheers,

Martin Braure de Calignon

--- System information. ---
Architecture: i386
Kernel:       Linux 2.6.32-5-686

Debian Release: squeeze/sid
  995 testing         www.debian-multimedia.org 
  995 testing         security.debian.org 
  995 testing         ftp2.fr.debian.org 
  500 stable          ftp2.fr.debian.org 
   50 unstable        ftp2.fr.debian.org 
    1 experimental    ftp2.fr.debian.org 

--- Package information. ---
Depends                (Version) | Installed
================================-+-==============
libc6                   (>= 2.8) | 2.11.2-2
libcap-ng0                       | 0.6.4-1
libgcrypt11           (>= 1.4.2) | 1.4.5-2
libgnutls26        (>= 2.7.14-0) | 2.8.6-1
libsasl2-2                       | 2.1.23.dfsg1-5
libxenstore3.0        (>= 3.2.0) | 4.0.1~rc3-1
libxml2               (>= 2.7.4) | 2.7.7.dfsg-4


Recommends      (Version) | Installed
=========================-+-===========
lvm2                      | 2.02.66-2


Package's Suggests field is empty.






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