[libvirt] Hyper-V driver API version support

[surface at me.is-a-linux-user.org]

> On Fri, Aug 09, 2013 at 10:13:03AM +0200, 
> surface at me.is-a-linux-user.org wrote:
>> Hello
>> 
>> The "version" function is not supported by the hyperv driver:
>> $ virsh --connect=hyperv://hypervhost version
>> Compiled against library: libvirt 1.1.1
>> Using library: libvirt 1.1.1
>> Using API: Hyper-V 1.1.1
>> error: failed to get the hypervisor version
>> error: this function is not supported by the connection driver:
>> virConnectGetVersion
>> 
>> But we need this funtion for the "external/libvirt" stonith plugin
>> of clusterglue:
>> 
>> $ cat /usr/lib/stonith/plugins/libvirt | more
>> # get status of stonith device (*NOT* of the domain).
>> # If we can retrieve some info from the hypervisor
>> # the stonith device is OK.
>> libvirt_status() {
>>     out=$($VIRSH -c $hypervisor_uri version 2>&1)
>>     if [ $? -eq 0 ]
>>     then
>>         out=`echo "$out" | tail -1`
>>         ha_log.sh notice "$hypervisor_uri: $out"
>>         return 0
>>     fi
>> 
>>     ha_log.sh err "Failed to get status for $hypervisor_uri"
>>     ha_log.sh err "$out"
>>     return 1
>> }
>> 
>> So, we can't implement libvirt stonith with hyperv support in our
>> corosync/pacemaker cluster. Is it possible to implement the
>> "version" function for hyperv into virConnectGetVersion? Or exist
>> any workaround for this problem?
> 
> I'm sure its possible, but it needs someone with knowledge of the
> Hyper-V apis to write a patch and there's only a couple of people
> in libvirt comunity who can do that. Patches welcome from any able
> person...
> 
> Daniel

Hi Daniel

I don't know which api is used for the driver handling, maybe you mean 
this one here: http://msdn.microsoft.com/en-us/library/aa155227.aspx

I tested the following command on our micro$oft server:
PS C:\Users\administrator> gwmi -namespace "root\virtualization" 
Msvm_VirtualSystemManagementService


__GENUS                 : 2
__CLASS                 : Msvm_VirtualSystemManagementService
__SUPERCLASS            : CIM_VirtualSystemManagementService
__DYNASTY               : CIM_ManagedElement
__RELPATH               : 
Msvm_VirtualSystemManagementService.CreationClassName="Msvm_VirtualSystemManagementService",N
                           
ame="vmms",SystemCreationClassName="Msvm_ComputerSystem",SystemName="VSRV1"
__PROPERTY_COUNT        : 21
__DERIVATION            : {CIM_VirtualSystemManagementService, 
CIM_Service, CIM_EnabledLogicalElement,
                           CIM_LogicalElement...}
__SERVER                : VSRV1
__NAMESPACE             : root\virtualization
__PATH                  : 
\\VSRV1\root\virtualization:Msvm_VirtualSystemManagementService.CreationClassName="Msvm_
                           
VirtualSystemManagementService",Name="vmms",SystemCreationClassName="Msvm_ComputerSystem",Sys
                           temName="VSRV1"
Caption                 : Hyper-V Virtual System Management Service
CreationClassName       : Msvm_VirtualSystemManagementService
Description             : Service for creating, manipulating, and 
managing virtual systems
ElementName             : Hyper-V Virtual System Management Service
EnabledDefault          : 2
EnabledState            : 2
HealthState             : 5
InstallDate             : 20130717120539.000000-000
Name                    : vmms
OperationalStatus       : {2}
OtherEnabledState       :
PrimaryOwnerContact     :
PrimaryOwnerName        :
RequestedState          : 12
Started                 : True
StartMode               :
Status                  : OK
StatusDescriptions      : {The service is running normally}
SystemCreationClassName : Msvm_ComputerSystem
SystemName              : VSRV1
TimeOfLastStateChange   : 20130801095437.000000-000
PSComputerName          : VSRV1

so I think we can query the state like this:
PS C:\Users\administrator> gwmi -namespace "root\virtualization" 
Msvm_VirtualSystemManagementService | select Status


Status
------
OK

It's not the version, but we need something to let libvirt stonith know, 
that the stonith device can connect to hyperv and the hyperv service is 
running..