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Re: [libvirt] [PATCH 4/4] remote: Detect 'nc' version incompatibilities



On 02/15/2010 06:11 AM, Daniel P. Berrange wrote:
> On Fri, Feb 12, 2010 at 10:32:17AM -0500, Cole Robinson wrote:
>> This ugly thing is a shell script to detect availability of
>> the -q option for 'nc': debian and suse based distros need this
>> flag to ensure the remote nc will exit on EOF, so it will go away
>> when we close the tunnel. If it doesn't go away, a useless 'nc'
>> process is left sitting on the remote host.
>>
>> Fedora's 'nc' doesn't have this option, so we can't blindly pass -q.
>> More info here:
> 
> I don't really like this approach. Shouldn't it be sufficient to
> just explicit SIGKILL the ssh client, rather than relying on the
> exit-on-EOF behaviour of nc.
> 

kill() helps prevent virt-manager from hanging, but it doesn't address the
dangling 'nc' process on the remote host that requires -q. Every connection
will leave an 'nc' process hanging.

- Cole


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