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Add the xyz.openbmc_project.Software.Version interface to
the elog entries. This allows a user to know what BMC code
level was running when the error was created. The level is
persisted along with the other elog fields.
If this code is flashed on a system that was running older code,
and there were existing error logs, the version property will
be left empty in the restored log entries.
Older code is still able to restore logs created by this code
as the version property is at the end of the serialized data
and so is just ignored by Cereal.
Resolves openbmc/openbmc#3133
Tested: Check that new error logs have the code level, and that
restarting phosphor-log-manager preserves that property
on the existing logs. Various incantations of running
the older code with logs created by this code, and running
this code with logs created by older code.
Change-Id: I682aa3bf97c8352ce6dda05dfdf55d33173de891
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
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