Description of problem:
Errors are reported when trying to use two hostDisk volumes on a VM that point to the same directory. The VM does not start.

The events from the VMI are:
  Warning  FailedCreate  2m               virtualmachine-controller  Error creating pod: Pod "virt-launcher-vm-hostdisk-5-bktxl" is invalid: [spec.containers[0].volumeMounts[4].mountPath: Invalid value: "/srv/vms": must be unique, spec.containers[0].volumeMounts[5].mountPath: Invalid value: "/srv/vms": must be unique]

Images from multiple VMs can exist in the same local directory and the error is not reported and the VMs start. But a single VM cannot put multiple images into the same directory.

I tried adding the shared option, set to both true and false, to the hostDisk definitions and the issue remained.


Version-Release number of selected component (if applicable):


How reproducible:
always

Steps to Reproduce:
1. create a directory to hold virtual machine disk images
2. create a virtualMachine that uses hostDisk for its disks. each hostDisk points to a seperate image file in the same directory
3.

Actual results:
VM will not start

Expected results:
disk images are created in the shared directory and the VM starts.

Additional info:
The following is the VM definition.


apiVersion: kubevirt.io/v1alpha3
kind: VirtualMachine
metadata:
  creationTimestamp: 2019-07-03T15:35:22Z
  generation: 1
  labels:
    kubevirt.io/vm: vm-hostdisk-5
  name: vm-hostdisk-5
  namespace: host-disk-test
  resourceVersion: "3190108"
  selfLink: /apis/kubevirt.io/v1alpha3/namespaces/host-disk-test/virtualmachines/vm-hostdisk-5
  uid: 2beba160-9da8-11e9-88af-120000002442
spec:
  running: false
  template:
    metadata:
      creationTimestamp: null
      labels:
        kubevirt.io/vm: vm-hostdisk-5
    spec:
      domain:
        cpu:
          cores: 2
        devices:
          disks:
          - bootOrder: 2
            disk:
              bus: virtio
            name: os-disk
          - disk:
              bus: virtio
            name: data1-disk
          - disk:
              bus: virtio
            name: data2-disk
          interfaces:
          - bootOrder: 1
            bridge: {}
            macAddress: "02:12:00:12:12:14"
            name: multus-br
        machine:
          type: ""
        resources:
          requests:
            cpu: "2"
            memory: 8Gi
      networks:
      - multus:
          networkName: multus-br
        name: multus-br
      terminationGracePeriodSeconds: 0
      volumes:
      - hostDisk:
          capacity: 100Gi
          path: /srv/vms/vm-hostdisk-5-os.img
          shared: true
          type: DiskOrCreate
        name: os-disk
      - hostDisk:
          capacity: 10Gi
          path: /srv/vms/vm-hostdisk-5-data1.img
          shared: true
          type: DiskOrCreate
        name: data1-disk
      - hostDisk:
          capacity: 10Gi
          path: /srv/vms/vm-hostdisk-5-data2.img
          shared: true
          type: DiskOrCreate
        name: data2-disk
status: {}