Implement OEM mechanism to handle xyz.openbmc_project.Condition.HostFirmware interface

[Thu Nguyen]

Dear Geissonator,


After commit 
https://github.com/openbmc/phosphor-state-manager/commit/0d1c3f1f9329c853677f0581287afef83eeea0f0

when BMC boots up, phosphor-host-state directly checks  the host state 
thru interface xyz.openbmc_project.Condition.HostFirmware.

It does not check the existing of /run/openbmc/host@%d-on as before.


I plan to implement "oem mechanism" to handle the interface 
xyz.openbmc_project.Condition.HostFirmware.

Which will use the GPIO interface to update the host state. I researched 
the code handle this interface in phosphor-host-ipmi and pldm.

I wonder which repo should I upstream the code? Currently, we don't have 
any OEM repo in github to upstream the code.

Do you have any idea to handle interface in bash scripts?


Regards.

Thu Nguyen.