tree c90d0b05f46a7d2bfe4e02a5899bd6193040c9a2
parent c2f84c7bb9107bd691d9e528f7462e2fc22cae3c
author Matt Spinler <spinler@us.ibm.com> 1684956509 -0500
committer Matt Spinler <spinler@us.ibm.com> 1685025333 -0500

Convert version 1 files to version 2 on startup

When reading in persisted property values from their files, check the
version number the file was saved in.  If that version is less than the
first version using name/value pairs, then rewrite the file using the
latest version.

This is done so that it removes the possibility of the problem described
in openbmc/phosphor-settingsd/#16 of occurring in the future, which is
where if a new property is added it gets set to another property's
value.

This also creates functions for the serializing and deserializing so the
code to do it just needs to be in one place.

Note that if a version of code runs from when before NVP support was
added, it can still read files saved with the new version so this change
is backwards compatible.

Change-Id: Ib0be93de2151bc9435664179690b0eac2bb980ff
Signed-off-by: Matt Spinler <spinler@us.ibm.com>