Jan Lübbe

@ejoerns I've rebased this onto the current master, which had moved some functions to `src/slot.c`.

I think we can merge the first two commits as they are, though.

I've merged the first two commits and rebased this PR.

The open comments need to be solved, but the general approach seems fine.

The open points still need to be resolved and we'd need test-cases to cover the new alternatives. Moving to the next release.

I've completed the function comments and we've done some more internal tests, so this should be ready for review.

> I've now also had a look at the tests, finally. > > Some minor fixes and proposals I've put here: https://github.com/ejoerns/rauc/tree/test-incremental But that should be all before we can...

We could add a cache for the path resolution and only print the warning once. Then `rauc status` could still show the original string.

The keyUsage/extendedKeyUsage looks fine (the check is implemented in https://github.com/rauc/rauc/blob/master/src/signature.c#L21 and you should see messages which part is actually failing). I would have hoped that `-c system.conf` with the purpose...

OK, thanks for testing this again. So we have two things we should fix: - [x] rauc -c should not silently fall back to defaults - [ ] we should...