On 2014-08-10 at 12:17:56 +0200, Johan Tibell wrote: [...]
First, doing that was in itself a bit of a pain. 'arc diff' didn't do the right thing and included some random commit(s) instead of my single commit in my feature branch. Perhaps it tried to diff against origin/master or something, which doesn't make any sense if you know how git is meant to be used (doing that would imply that you have to constantly sync with upstream to create a patch.) I eventually got it to used the right commit by doing 'arc diff <commit id>`.
While this doesn't answer your question (I'm looking forward to Austin chiming in to answer as I'd like to understand 'arc diff' better myself), I've been using arc which myself before performing 'arc diff's to reduce my surprise/confusion about which commits 'arc diff' will effectively pick. HTH, hvr