Redmine

No, the Redmine hook is almost worthless. See this link. I think it's being worked on.

Aron, I tried getting it to work too, and ran into the same issue. Got the same error in Apache2. Looking over the issue, the hook is not what it appears to be. It tells Redmine to fetch its local repository. It doesn't pull from remote Github repositories. The Chiliproject guys are actually recommending to remove that hook from Github. I think I'll be trying out this plugin (https://github.com/koppen/redmine_github_hook).

Ahh fantastic. Finally, a solid answer to this question that I've been grappling with all day.

Is there any reason why the Git plugin can't just do a fetch during the fetch_changesets? Seems that since it's already calling a bunch of git commands, why not chuck a 'git fetch' in there as well (or else provide an option)?

Github Redmine Service Hook still doesn't work. Payload is sent but repository isn't going to be refreshed.

Anyway, the plugin mentioned by Joshua (https://github.com/koppen/redmine_github_hook) works well with Redmine 2.1.6.
Don't forget to grant the correct permissions for the bare github repository to the Redmine-Webserver user (e.g. 'apache' or 'www-data'). This user also needs its own SSH key, because the 'git fetch' command is executed by the redmine plugin => the redmine webserver user.

Tobias, I don't use SSH keys and it works. Since the git repo local to redmine is read-only and a mirror downstream from the github repo, I use the http or git read-only link (which doesn't require SSH keys).

Chris, I forgot to tell that my test repository is a private github repo.
Therefore I needed SSH authentification to update my local bare repository. Otherwise, with the http or git read-only link, it would have asked me for username and password at every time...

I didn't try the "official" Github Redmine Service Hook with a public github repo, but with my private repo and SSH authentification it didn't work. I therefore needed the "redmine_github_hook" plugin...

The official Redmine hook on Github also failed for me. Installing https://github.com/koppen/redmine_github_hook was easy and it works (as long as the local repository is writtable).

Don't use the default Github Service hook for Redmine.

I can confirm, that https://github.com/koppen/redmine_github_hook
works great. Use that instead.

Github Service hook for Redmine is now used by SCM Creator to keep Github repos in sync.