Description:

Swift upgrades from source versions subsequent to Victoria fail to be detected. The issue occurs because the get_os_version_package function cannot find a valid codename for versions beyond Victoria. This is the chain of events that lead to this issue:

• The function do_action_openstack_upgrade calls openstack_upgrade_available(package) to determine if an OpenStack upgrade is available for the specified package, Swift in this case (reference).
• Inside openstack_upgrade_available, the current Swift version is determined by get_os_version_package (reference).
• The function get_os_version_package attempts to find the version by looking up the SWIFT_CODENAMES dictionary (reference). However, since the version is not included in SWIFT_CODENAMES, the function returns None.
• As a result, openstack_upgrade_available determines that no upgrade is available, returning False (reference).
• Because openstack_upgrade_available(package) returns False, the do_action_openstack_upgrade function sets the action status to {'outcome': 'no upgrade available'} and terminates without performing the upgrade (reference).

Expected Behavior:

The charm should correctly identify the Source version, compare it to the Target version, and proceed with the upgrade.

Current Behavior:

The upgrade fails because the SWIFT_CODENAMES mapping does not include entries for versions beyond Victoria, returning {'outcome': 'no upgrade available'}.

Possible Solution

Determine the Swift version similarly to how it is done for other OpenStack packages: by identifying the current release using the openstack-release package.

Steps to Reproduce:

1. Attempt to upgrade Swift from Wallaby to Xena.
2. Observe that the upgrade fails with the message: {'outcome': 'no upgrade available.'}.