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a03121bcfe
If qemudDomainRestore fails to open the domain save file, create a pipe, then fork a process that does setuid(qemu_user) and opens the file, then reads this file and stuffs it into the pipe. the parent libvirtd process will use the other end of the pipe as its fd, then reap the child process after it's done reading. This makes domain restore work on a root-squash NFS share that is only visible to the qemu user. * src/qemu/qemu_driver.c: add new qemudOpenAsUID() helper function, and use it in qemudDomainRestore() if reading as root directly failed.
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>