[OpenWrt-Devel] [RFC PATCH] sysupgrade: introduce compatibility version for devices

[Bjørn Mork]

I haven't even bother to try to write any code to see if this is
feasible, but anyway...

I wonder if there might be more flexible and user-friendly ways to
handle upgrade incompatibilities if we are allowed to use code/metadata
from the new image in the sysupgrade process?  Instead of just providing
a version number with some simple semantics like you describe, the new
image could provide a script snippet or similar which codifies a more
precise description of the incompatibility. And even a solution, if
there is one.

For the DSA example, such a script could (optionally?) move an
incompatible config/network out of the way, while leaving all other
settings untouched.  Preserving e.g. wireless config has a lot of value.
With the possibily to cancel the upgrade, it would even attempt an
incomplete conversion.  IMHO, the main reason we can't do automatic DSA
conversion is because there will be failures.  But this isn't critical
if it is detected prior to upgrading.

Just a few random thoughts.  Since you are about to fundamentally
improve sysupgrade anyway ;-)


Bjørn

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