Git post-receive hook to update Redmine changesets

post-receive

#!/bin/sh

# Add this hook to /usr/share/git-core/templates/hooks to enable for all new repositories.

REPO_URL=`echo $PWD | sed 's:/hooks$::'` /usr/share/redmine/script/runner /usr/share/redmine/extra/update_repository.rb -e production > /dev/null 2>&1 &

update_repository.rb

# Add this code to /usr/share/redmine/extra/update_repository.rb

r = Repository.find_by_url(ENV['REPO_URL'])
r.fetch_changesets unless r.nil?

Your gitosis user should belong to the www-data group (or whichever group your web server runs as) so it may update the repository in your database if using Sqlite:
$ usermod -a -G www-data gitosis

Oh, and now you can turn "Auto-fetch Commits" off in Redmine's settings.