Comment 0 for bug 1631481

Resize revertion leaves instance directory on the second host with Ceph image backend. As the result the second attempt to resize the instance to the same host fails with n-cpu.log:

Traceback (most recent call last):
  File "/opt/stack/nova/nova/compute/manager.py", line 3942, in finish_resize
    disk_info, image_meta)
  File "/opt/stack/nova/nova/compute/manager.py", line 3907, in _finish_resize
    old_instance_type)
  File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    self.force_reraise()
  File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    six.reraise(self.type_, self.value, self.tb)
  File "/opt/stack/nova/nova/compute/manager.py", line 3902, in _finish_resize
    block_device_info, power_on)
  File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 7185, in finish_migration
    self._ensure_console_log_for_instance(instance)
  File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 2845, in _ensure_console_log_for_instance
    libvirt_utils.file_open(console_file, 'a').close()
  File "/opt/stack/nova/nova/virt/libvirt/utils.py", line 313, in file_open
    return open(*args, **kwargs)
IOError: [Errno 13] Permission denied: '/opt/stack/data/nova/instances/ad52ca5b-bb65-4f7c-87e8-750cb3cd9c5e/console.log'

$ ll ~/data/nova/instances/ad52ca5b-bb65-4f7c-87e8-750cb3cd9c5e/
total 24
-rw-rw-r--. 1 qemu qemu 19342 Oct 7 21:23 console.log
-rw-rw-r--. 1 stack libvirtd 2762 Oct 7 21:22 libvirt.xml

Steps to reproduce:
1 Run 2-nodes devstack with Ceph image backend
2 Run an instance
 $ nova boot --image cirros-0.3.4-x86_64-disk --flavor t1.nano inst-1
3 Disable the instance host
 $ nova service-disable 172.16.1.10 nova-compute
4 Resize the instance to another host
 $ nova migrate inst-1
5 Revert resize
 $ nova resize-revert inst-1
6 Resize the instance again
 $ nova migrate inst-1
7 Check the instance state

Actual result - the instance is in error state.
Expected result - the instance is in verify_resize state.

Check n-cpu.log on the second node, where the instance was migrated.