tree 465109ac3292aa8a13117e0a60eb77a0275d1ca2
parent b7552f0cbc6692693ef3430e0faa4f145f7b08c3
author Shawn McCarney <shawnmm@us.ibm.com> 1604536081 -0600
committer Shawn McCarney <shawnmm@us.ibm.com> 1604610564 -0600

regulators: Add hardware presence service

The regulators application needs to determine whether hardware is
present or absent.  Some voltage regulators are optional, and
configuration should only be performed if the regulator is present.

Add a new class to obtain hardware presence data from the D-Bus
xyz.openbmc_project.Inventory.Item interface.

Also define an abstract base class and a mock implementation to enable
use of gmock in test cases related to hardware presence.

Tested:
* Tested where inventory path is present
* Tested where inventory path is not present
* Tested where inventory path is invalid and results in an exception
* Verified that mock implementation could be used in a gmock test case
* Full test plan available at
  https://gist.github.com/smccarney/2b6ea6ecbbeaf5a8b1793e2321799972

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Ia25a92815efc506c3ef4ac72844c17120c4ce9b7