Phosphor code updater

[Vijay Khemka]

Hi Brad,
I looked into code updater from phosphor-software-manager as you suggested last week. As per current implementation, it is copying all 4 partition uboot, kernel, rootfs and rwfs. I wanted to make some modification to allow user to choose whether to upgrade rwfs or not. This way, all persistent storage can be retained after upgrade as well.

In my proposal, I will add another property named FactoryImageInstall which can be set as 1. ”true” means whole image would be installed including rwfs and 2. “false” means everything will be installed except rwfs partition. This way, old rwfs partition will be retained. This property will be under  xyz.openbmc_project.Software.Activation  interface.

Please provide your opinion. I will send patch soon.

Regards
-Vijay
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