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Re: [libvirt] [PATCH] daemon: Fix LIBVIRT_DEBUG=1 default output



On 10/24/2012 06:11 PM, Eric Blake wrote:
> On 10/24/2012 03:47 PM, Eric Blake wrote:
>> On 10/24/2012 03:01 PM, Cole Robinson wrote:
>>> This commit changes the behavior of LIBVIRT_DEBUG=1 libvirtd:
>>>
>>> $ git show 7022b09111d4322d21396a70d58320a9ad773962
>>> commit 7022b09111d4322d21396a70d58320a9ad773962
>>> Author: Daniel P. Berrange <berrange redhat com>
>>> Date:   Thu Sep 27 13:13:09 2012 +0100
>>>
>>>     Automatically enable systemd journal logging
>>>
>>>     Probe to see if the systemd journal is accessible, and if
>>>     so enable logging to the journal by default, rather than
>>>     stderr (current default under systemd).
>>>
>>> Previously  'LIBVIRT_DEBUG=1 /usr/sbin/libvirtd' would show all debug
>>> output to stderr, now it send debug output to the journal.
>>>
>>> Only use the journal by default if running in daemon mode, or
>>> if stdin is _not_ a tty. This should make libvirtd launched from
>>> systemd use the journal, but preserve the old behavior in most
>>> situations.
>>
>> Makes sense.
> 
> Thinking about it a bit more, should we be checking if stderr, rather
> than stdin, is a ttty?  That is, if you run 'libvirtd </dev/null' from a
> terminal, don't you still want output to the stderr tty?
> 

But the libvirtd > out 2>&1 is going to stop working which is a lot more
useful then anything stdin related.

- Cole


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