nova/nova/virt/libvirt
Lee Yarwood 2c6e59e835 libvirt: Avoid using os-brick encryptors when device_path isn't provided
When disconnecting an encrypted volume the Libvirt driver uses the
presence of a Libvirt secret associated with the volume to determine if
the new style native QEMU LUKS decryption or original decryption method
using os-brick encrytors is used.

While this works well in most deployments some issues have been observed
in Kolla based environments where the Libvirt secrets are not fully
persisted between host reboots or container upgrades. This can lead to
_detach_encryptor attempting to build an encryptor which will fail if
the associated connection_info for the volume does not contain a
device_path, such as in the case for encrypted rbd volumes.

This change adds a simple conditional to _detach_encryptor to ensure we
return when device_path is not present in connection_info and native
QEMU LUKS decryption is available. This handles the specific use
case where we are certain that the encrypted volume was never decrypted
using the os-brick encryptors, as these require a local block device on
the compute host and have thus never supported rbd.

It is still safe to build an encryptor and call detach_volume when a
device_path is present however as change I9f52f89b8466d036 made such
calls idempotent within os-brick.

Change-Id: Id670f13a7f197e71c77dc91276fc2fba2fc5f314
Closes-bug: #1821696
(cherry picked from commit 56ca4d32dd)
(cherry picked from commit c6432ac021)
2019-04-30 09:27:36 +01:00
..
storage Merge "Revert "Re-using the code of os brick cinder"" 2018-06-19 02:08:35 +00:00
volume libvirt: set device address tag only if setting disk unit 2019-04-18 15:56:28 +00:00
__init__.py Remove vi modelines 2014-02-03 14:19:44 +00:00
blockinfo.py Rename block_device_info_get_root 2018-01-11 20:46:13 +00:00
compat.py Remove translation of log messages 2017-06-13 11:20:28 +07:00
config.py Implement discard for file backed memory 2018-06-21 11:45:31 -05:00
designer.py add mtu to libvirt xml for ethernet and bridge types 2018-06-06 09:39:40 -04:00
driver.py libvirt: Avoid using os-brick encryptors when device_path isn't provided 2019-04-30 09:27:36 +01:00
firewall.py Replaces uuid.uuid4 with uuidutils.generate_uuid() 2017-07-25 10:45:03 +05:30
guest.py Add missing libvirt exception during device detach 2019-04-10 14:31:16 -06:00
host.py libvirt: Don't react to VIR_DOMAIN_EVENT_SUSPENDED_MIGRATED events 2018-08-23 14:44:22 -04:00
imagebackend.py libvirt: set device address tag only if setting disk unit 2019-04-18 15:56:28 +00:00
imagecache.py Move the dac_admin privsep code to a new location. 2017-09-18 23:14:11 +10:00
instancejobtracker.py Remove translation of log messages 2017-06-13 11:20:28 +07:00
migration.py libvirt: Avoid setting MTU during live migration if unset 2018-10-29 22:46:06 +01:00
utils.py Add method to get cpu traits 2018-07-24 12:37:46 +00:00
vif.py libvirt: skip setting rx/tx queue sizes for not virto interfaces 2018-09-04 07:09:27 +00:00