Persistent storage of AssetTag

[Troy.Lee at vertiv.com]

Hi,

We met an issue about persistent storage of AssetTag.
AssetTag is managed by phosphor-inventor-manager, and it was defined with assettag.yaml.
Though we could update the AssetTag with DCMI command over IPMI or DBus, but the value will not retain after BMC reboot.

If we use Notify over DBus, I could see the value is stored in /var/lib/phosphor-inventory-manager/xyz/openbmc_project/inventory/system/xyz.openbmc_project.Inventory.Decorator.AssetTag.
After phosphor-inventor-manager started, it first deserialize from AssetTag json file from Manager::restore(), and then it be overwritten with default value in Manager::run().
The issues seems to be related to the startup event with actions name of "createObjects".

Does this behavior work as expect in OpenBMC? (AssetTag become empty string after reboot)
Does anyone have suggestion how to change the YAML to have persistent storage for Asset Tag?

Reference:
- assettag.yaml: https://github.com/openbmc/openbmc/blob/master/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager-assettag/assettag.yaml
- manager::restore(): https://github.com/openbmc/phosphor-inventory-manager/blob/ded627c42f5e5319e3704fff742a0227c05f00a9/manager.cpp#L355-L359
- manager::run(): https://github.com/openbmc/phosphor-inventory-manager/blob/master/manager.cpp#L114-L117
- Issue#2867: https://github.com/openbmc/openbmc/issues/2867



Thanks,
Troy Lee
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