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Re: [libvirt] [PATCH] snapshot: detect when qemu lacks disk-snapshot support



On 10/18/2011 03:51 PM, Eric Blake wrote:
Noticed when testing new libvirt against old qemu that lacked the
snapshot_blkdev HMP command.  Libvirt was mistakenly treating the
command as successful, and re-writing the domain XML to use the
just-created 0-byte file, rendering the domain broken on restart.

* src/qemu/qemu_monitor_text.c (qemuMonitorTextDiskSnapshot):
Notice another possible error message.
---
  src/qemu/qemu_monitor_text.c |    3 ++-
  1 files changed, 2 insertions(+), 1 deletions(-)

Phooey - testing reveals that this fixes the main problem (the command now fails with a nice error without corrupting the domain xml:

# virsh snapshot-create --disk-only dom
error: operation failed: Failed to take snapshot: unknown command: 'snapshot_blkdev'

), but isn't quite perfect (the 0-byte file is still left behind). v2 coming up soon.

--
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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