tree 2020e1b302ee98961c6cae21fbfc5f67e81115e9
parent 73a6f0d869c67223c0461d1b00af3f38c0928baf
author Shawn McCarney <shawnmm@us.ibm.com> 1731901777 -0600
committer Shawn McCarney <shawnmm@us.ibm.com> 1732133233 -0600

Get model using command line tool

Get the PSU model using a command line tool specified in the meson
options.  The default tool is 'psutils --get-model'.  The tool should
get the model data directly from the PSU.

This is more accurate than getting the Model property of the Asset
interface on D-Bus.  Inventory Manager saves its state to files.  When
the BMC is booted, Inventory Manager initializes itself using the saved
state. This is necessary to handle the scenario where the BMC is
rebooted while the rest of the system is powered on (such as a
concurrent BMC code update).

However, if all power was removed from the system, a PSU may have been
added/removed/replaced while the BMC was offline. When the BMC boots,
the Inventory Manager saved state is not correct.

Eventually the PSU monitoring application will update the model on
D-Bus, but this can take a non-trivial amount of time.  This is
especially true if EntityManager is used to provide the PSU bus and
address information to the PSU monitoring application.

Tested:
* Verified all automated tests build and run successfully
* Verified application uses command line tool to obtain model
* Verified command line tool was returning the correct model
* Test where command line tool fails with non-zero exit code
* Tested where all PSU information available when application starts
* Tested where PSU information is obtained after application starts
  using the InterfacesAdded handler
* Tested where PSU presence changes and is obtained by the
  PropertiesChanged handler
* Full test plan is available at
  https://gist.github.com/smccarney/87bd821a6d317ec0915d1f162028ff01

Change-Id: Ia9d35850aa6ac27dd006679991272232d67390ff
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>