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Several users have reported problems with 'virsh start' failing because it was encountering a managed save situation where the managed save file was incomplete. Be more robust to this by using two different magic numbers, so that newer libvirt can gracefully handle an incomplete file differently than a complete one, while older libvirt will at least fail up front rather than trying to load only to have qemu fail at the end. Managed save is a convenience - it exists to preserve as much state as possible; if the state was not preserved, it is reasonable to just log that fact, then proceed with a fresh boot. On the other hand, user saves are under user control, so we must fail, but by making the failure message distinct, the user can better decide how to handle the situation of an incomplete save file. * src/qemu/qemu_driver.c (QEMUD_SAVE_PARTIAL): New define. (qemuDomainSaveInternal): Use it to mark incomplete images. (qemuDomainSaveImageOpen, qemuDomainObjRestore): Add parameter that controls what to do with partial images. (qemuDomainRestoreFlags, qemuDomainSaveImageGetXMLDesc) (qemuDomainSaveImageDefineXML, qemuDomainObjStart): Update callers. Based on an initial idea by Osier Yang.
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>