I am confused on how to invoke the web app. I am learning how to use this tool, however I don't feel quite confident yet. I wanted to test out the web app, to play around with configurations and auto syncing, however I stumbled over this:
➜ ~ git annex help webapp // works fine
➜ ~ git annex webapp
Invalid argument `webapp' // uhh what.
git-annex-webapp didn't work either.
I installed with brew. El Capitan, latest update as of right now.
git-annex can be built with or without support for the webapp. I suppose that your brew install is of the latter variety. For a build with the webappp included: http://git-annex.branchable.com/install/OSX/ (or ask the brew developers to include the webapp in their build)
After revisiting this issue the guys over at Homebrew have no idea whats going on apparently. The build process seems to be fairly complicated although obviously automated by cabal. The feature just seemed to went missing and nobody has an idea where to search. I am currently compiling from source and fairly confident that I will get it working.
Since not everyone has the time to deal with this in their freetime, and brew is pretty much done to to this kind of thing automagically, maybe it is worth checking with them what went wrong.
https://github.com/Homebrew/homebrew/search?q=git+annex+webapp&type=Issues&utf8=%E2%9C%93 reveals two issues about the webapp and S3 features disappearing in between updates with no changes to the formula.
Seems to have been resolved in brew by forcing the Webapp flag, which I think is the right solution.