[libvirt] [PATCH] domain: Improve error output for virDomainListGetStats

Eric Blake eblake at redhat.com
Tue Nov 4 11:19:41 UTC 2014

On 11/04/2014 07:51 AM, Luyao Huang wrote:
> When pass flags --domain and --list-* to cmdDomstats,
> a unsupport error will output from qemuConnectGetAllDomainStats.
> error: unsupported flags (0x1) in function qemuConnectGetAllDomainStats
>>From manual of virsh: The approaches can't be combined.

NACK.  While they cannot be combined in the current implementation, I
see nothing that would prohibit a future implementation from allowing
the combination (for example, show me all stats for a given domain, but
only if the domain is running).  Prohibiting in libvirt-domian.c would
prevent an older RPC client from talking to a newer server that supports
the combination.  We should only prohibit combinations in libvirt-*.c if
there is no chance we will ever extend things to allow the combination.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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