Git pre-push hook not working

The name of the hook must be exactly pre-push (not pre-push.sh, not pre-push.exe, not pre-push.py ...)

pre-push.sh isn't a valid hook name. Instead this needs to be placed on the server as a pre-receive hook.

I just ran into the same problem and had a proper name for the hook BUT also had to make sure it was executable

chmod 766 .git/hooks/pre-push

fixed it.