How to trigger unison sync files and directories when there's any change on OSX?

Question

I have a need to sync two directories on OSX. I find this post recommending using unison.

I tried unison, it seems it can sync two directories very well. But it doesn't do synchronization automatically( always keep two directories synced when there's any change ).

So I guess to accomplish my purpose, unison should be used with a trigger which will watch changes and notify unison to do its work.

But how to do that? Any recommendation and tutorial?

Answer 1

Unison has this capability built in. Just add the line repeat = watch to your Unison profile.

Answer 2

Install Unison:

brew install unison

Install unox:

git clone [email protected]:hnsl/unox.git
cd unox
ln -s $PWD/unox.py /usr/local/bin/unison-fsmonitor

Do the initial sync:

unison -auto -batch dirA dirB

Run the continuous bidirectional sync:

unison -auto -batch -repeat watch -times dirA dirB