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[melanie witt <1960230@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova/xena
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1960230

Title:
  resize fails with FileExistsError if earlier resize attempt failed to
  cleanup

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) xena series:
  New

Bug description:
  This bug is related to resize with the libvirt driver

  If you are performing a resize and it fails the
  _cleanup_remote_migration() [1] function in the libvirt driver will
  try to cleanup the /var/lib/nova/instances/<uuid>_resize directory on
  the remote side [2] - if this fails the <uuid>_resize directory will
  be left behind and block any future resize attempts.

  2021-12-14 14:40:12.535 175177 INFO nova.virt.libvirt.driver
  [req-9d3477d4-3bb2-456f-9be6-dce9893b0e95
  23d6aa8884ab44ef9f214ad195d273c0 050c556faa5944a8953126c867313770 -
  default default] [instance: 99287438-c37b-44b0-834e-55685b6e83eb]
  Deletion of
  /var/lib/nova/instances/99287438-c37b-44b0-834e-55685b6e83eb_resize
  failed

  Then on next resize attempt a long time later

  2022-02-04 13:07:31.255 175177 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 10429, in migrate_disk_and_power_off
  2022-02-04 13:07:31.255 175177 ERROR oslo_messaging.rpc.server     os.rename(inst_base, inst_base_resize)
  2022-02-04 13:07:31.255 175177 ERROR oslo_messaging.rpc.server FileExistsError: [Errno 17] File exists: '/var/lib/nova/instances/99287438-c37b-44b0-834e-55685b6e83eb' -> '/var/lib/nova/instances/99287438-c37b-44b0-834e-55685b6e83eb_resize'

  This is happens here [3] because os.rename tries to rename the
  /var/lib/nova/instances/<uuid> dir to <uuid>_resize that already
  exists and fails with FileExistsError.

  We should check if the directory exists before trying to rename and
  delete it before.

  [1] https://opendev.org/openstack/nova/src/branch/stable/xena/nova/virt/libvirt/driver.py#L10773
  [2] https://opendev.org/openstack/nova/src/branch/stable/xena/nova/virt/libvirt/driver.py#L10965
  [3] https://opendev.org/openstack/nova/src/branch/stable/xena/nova/virt/libvirt/driver.py#L10915

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