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If debugging is enabled, the debug messages are sent to stderr. Moreover, if a command has catching of stderr set, the messages gets mixed with stdout output (assuming both outputs are stored in the same variable). The resulting string then doesn't necessarily have to start with desired prefix then. This bug exposes itself when parsing dnsmasq output: 2012-12-06 11:18:11.445+0000: 18491: error : dnsmasqCapsSetFromBuffer:664 : internal error cannot parse /usr/sbin/dnsmasq version number in '2012-12-06 11:11:02.232+0000: 18492: debug : virFileClose:72 : Closed fd 22' We can clearly see that the output of dnsmasq --version doesn't start with expected "Dnsmasq version " string but a libvirt debug output.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>