tree 27d7b709d45aa195527a6a4543c2db142d54aa68
parent 33cf9f08755eee80498ee5b2e0056263d1ed00bc
author Faisal Awada <faisal@us.ibm.com> 1715884292 -0500
committer George Liu <liuxiwei@ieisystem.com> 1719277958 +0000

Waiting for PSUs to be available during startup

Modified the Software PSU Updater Service to wait until inventory
service available. Updated ItemUpdater::scanDirectory to search
for the installed PSU model directory. For example, the PSU model
2B1E should have a directory named /usr/share/obmc/psu/2B1E. The
firmware file and the MANIFEST reside in the model directory.

Added a new function, `onInterfacesAdded`, processes D-Bus messages
to update the internal state of PSU  devices. It performs the following
steps:
- Read D-Bus message to extract the object path and interfaces.
- Check for PSU Interface.
- Retrieve all PSUs inventory paths from the D-Bus.
- Update PSU present status and model. If the PSU is present and has
  valid version, process FW update to latest version.

Fixed the issue with version comparison when there is no firmware to
compare with.

Tested:
Tested the code in simulation module and verified it waits for all PSUs
to be discovered. Verified phosphor-psu-code-manager invokes psutils to
get the PSU version, compare and update.

Change-Id: Ic26e215baffd56fc070cc0cf6d3fff92fdfb914c
Signed-off-by: Faisal Awada <faisal@us.ibm.com>