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https://bugzilla.redhat.com/show_bug.cgi?id=1282288 Although commit id '77346f27' resolves part of the problem regarding creating a qemu-img image in an NFS root-squash environment, it really didn't fix the entire problem. Unfortunately it only masked the problem. It seems qemu-img must open/create the image using 0644, which if used by target.perms would result in the chmod not being called since the mode desired and set match. Although qemu-img could conceivably ignore the mode when creating, libvirt has more knowledge of the environment and can make the adjustment to the mode far more easily by using virFileOpenAs with VIR_FILE_OPEN_FORCE_MODE. If that's successful, then we know on return the file will have the right owner and mode, so we can declare success
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>