git-fat VS janpatch

I've always liked the simplicity of git-fat [0]:

* Initial setup includes git filter rules so that "git add" automatically uses get-fat for matching files.

* It works by rsync'ing to/from the remote. The setup for this is in a single ".gitfat" file, separate from the filter rules.

* You do need to run "git fat push" and "git fat pull"; this can probably be automated with hooks.

So just offhand without even trying to think about the "right" way to do what you want, the committed ".gitfat" could be to a read-only remote, then you can swap it with your own un-committed file for a push that has an rsync-writeable remote.

Also, the whole thing is a single 628-line python file, so worst case it would be easy to tweak it to read something like ".gitfat-push" and not have to manually swap it.

[0] https://github.com/jedbrown/git-fat

Saving bandwidth with delta firmware updates In this article, François Baldassari, CEO at Memfault, presents step-by-step a way to enable firmware updates even for the devices connected over low bandwidth. The library JANPatch is used. It's the "embedded systems" and commercial friendly implementation of JojoDiff.

In embedded almost everybody uses efficient binary delta diffs and patching for DFOTA (delta firmware over the air update). Jojodiff exists as GPL and MIT variants.

http://jojodiff.sourceforge.net/

https://github.com/janjongboom/janpatch