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b1643dc15c
virFileOpenAs takes desired uid:gid as arguments, and not only uses them for a fork/setuid/setgid when retrying failed open operations, but additionally always forces the opened file to be owned by the given uid:gid. One example of the problems this causes is that, when restoring a domain from a file that is owned by the qemu user, opening the file chowns it to root. if dynamic_ownership=1 this is coincidentally expected, but if dynamic_ownership=0, no existing file should ever have its ownership changed. This patch adds an extra check before calling fchown() - it only does it if O_CREAT was passed to virFileOpenAs() in the openflags.
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>