protected override string GetCantExecuteReasonCore(IXenObject item)
{
VDI vdi = item as VDI;
if (vdi == null)
{
return(base.GetCantExecuteReasonCore(item));
}
SR sr = vdi.Connection.Resolve <SR>(vdi.SR);
if (sr == null)
{
return(Messages.SR_COULD_NOT_BE_CONTACTED);
}
VDI.FriendlyType vdiType = vdi.VDIType();
if (vdi.Locked)
{
return(vdiType == VDI.FriendlyType.SNAPSHOT ? Messages.CANNOT_DELETE_SNAPSHOT_IN_USE
: vdiType == VDI.FriendlyType.ISO ? Messages.CANNOT_DELETE_ISO_IN_USE
: Messages.CANNOT_DELETE_VD_IN_USE);
}
if (sr.Physical())
{
return(FriendlyErrorNames.VDI_IS_A_PHYSICAL_DEVICE);
}
if (sr.IsToolsSR())
{
return(Messages.CANNOT_DELETE_TOOLS_SR);
}
if (vdi.IsUsedByHA())
{
return(Messages.CANNOT_DELETE_HA_VD);
}
if (vdi.IsMetadataForDR())
{
return(Messages.CANNOT_DELETE_DR_VD);
}
List <VBD> vbds = vdi.Connection.ResolveAll <VBD>(vdi.VBDs);
if (vbds.Count > 1 && !AllowMultipleVBDDelete)
{
return(Messages.CANNOT_DELETE_VDI_MULTIPLE_VBDS);
}
foreach (VBD vbd in vbds)
{
VM vm = vdi.Connection.Resolve <VM>(vbd.VM);
if (vdiType == VDI.FriendlyType.SYSTEM_DISK)
{
if (vm.power_state == vm_power_state.Running)
{
return(string.Format(
Messages.CANNOT_DELETE_IN_USE_SYS_VD,
Helpers.GetName(vm).Ellipsise(20)));
}
}
if (vbd.Locked)
{
return(vdiType == VDI.FriendlyType.SNAPSHOT ? Messages.CANNOT_DELETE_SNAPSHOT_IN_USE
: vdiType == VDI.FriendlyType.ISO ? Messages.CANNOT_DELETE_ISO_IN_USE
: Messages.CANNOT_DELETE_VD_IN_USE);
}
if (vbd.currently_attached)
{
if (!AllowRunningVMDelete)
{
return(string.Format(Messages.CANNOT_DELETE_VDI_ACTIVE_ON,
Helpers.GetName(vm).Ellipsise(20)));
}
DeactivateVBDCommand cmd = new DeactivateVBDCommand(Program.MainWindow, vbd);
if (!cmd.CanExecute())
{
var reasons = cmd.GetCantExecuteReasons();
return(reasons.Count > 0
? string.Format(Messages.CANNOT_DELETE_CANNOT_DEACTIVATE_REASON,
Helpers.GetName(vm).Ellipsise(20), reasons.ElementAt(0).Value)
: Messages.UNKNOWN);
}
}
}
// This is a necessary final check, there are other blocking reasons non covered in this method
// Known examples:
// - someone else is calling a delete on this vdi already, altering the allowed ops
// - the storage manager cannot perform a delete on the SR due to drivers
if (!vdi.allowed_operations.Contains(vdi_operations.destroy))
{
return(vdiType == VDI.FriendlyType.SNAPSHOT ? Messages.CANNOT_DELETE_SNAPSHOT_GENERIC
: vdiType == VDI.FriendlyType.ISO ? Messages.CANNOT_DELETE_ISO_GENERIC
: Messages.CANNOT_DELETE_VD_GENERIC);
}
return(base.GetCantExecuteReasonCore(item));
}
protected bool CanExecute(VDI vdi)
{
if (vdi == null)
{
return(false);
}
SR sr = vdi.Connection.Resolve <SR>(vdi.SR);
if (sr == null)
{
return(false);
}
if (vdi.Locked)
{
return(false);
}
if (sr.Physical())
{
return(false);
}
if (sr.IsToolsSR())
{
return(false);
}
if (vdi.IsUsedByHA())
{
return(false);
}
List <VBD> vbds = vdi.Connection.ResolveAll <VBD>(vdi.VBDs);
if (vbds.Count > 1 && !AllowMultipleVBDDelete)
{
return(false);
}
foreach (VBD vbd in vbds)
{
VM vm = vdi.Connection.Resolve <VM>(vbd.VM);
if (vdi.type == vdi_type.system)
{
if (vm.power_state == vm_power_state.Running)
{
return(false);
}
}
if (vbd.Locked)
{
return(false);
}
if (vbd.currently_attached)
{
//Check if we can unplug
DeactivateVBDCommand cmd = new DeactivateVBDCommand(Program.MainWindow, vbd);
if (!AllowRunningVMDelete || !cmd.CanExecute())
{
return(false);
}
}
}
if (sr.HBALunPerVDI())
{
return(true);
}
if (!vdi.allowed_operations.Contains(vdi_operations.destroy))
{
if (AllowRunningVMDelete)
{
// We deliberately DONT call allowed operations because we assume we know better :)
// Xapi will think we can't delete because VBDs are plugged. We are going to unplug them.
// Known risks of this method that will make us fail because we are disrespecting xapi:
// - someone else is calling a delete on this vdi already, altering the allowed ops
// - the storage manager cannot perform a delete on the SR due to drivers
return(true);
}
return(false);
}
return(true);
}