[libvirt] About libvirt.py stdout redirection

[Daniel P. Berrange]

On Thu, Jan 16, 2014 at 06:31:02PM +0800, me,apporc wrote:
> Dear developers,
> As we know libvirt.py using libvirtmod.so, eg:
> 
>     def defineXML(self, xml):
>         """Define a domain, but does not start it.
>         This definition is persistent, until explicitly undefined with
>         virDomainUndefine(). A previous definition for this domain would be
>         overriden if it already exists. """
>         ret = libvirtmod.virDomainDefineXML(self._o, xml)
>         if ret is None:raise libvirtError('virDomainDefineXML() failed',
> conn=self)
>         __tmp = virDomain(self,_obj=ret)
>         return __tmp
> 
> 
> In my python program
> 
> #test.py
> import libvirt
> conn=libvirt.open("qemu:///system")
> xml=...
> conn.defineXML(xml) # Because i need this xml to be wrong for feature
> testing here
>  # Error will happen here, and error message is printed to stderr.
> 
> The error message is annoying.
> I need to know how to hide the error message printing to stderr by
> libvirtmod.
> 
> After i add sys.stderr = open('xxx', 'w') before invoking
> conn.defineXML(xml),  the error message is still printed to the terminal.
> Which means, i can redirect stderr to anywhere else in my python program,
>  but it changes back to terminal when control flow go to libvirtmod.

Do this:

  def libvirt_ignore(ignore, err):
      pass
  libvirt.registerErrorHandler(f=libvirt_ignore, ctx=None)

Daniel
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