# Plugin SyncGit by Céondo Ltd

The SyncGit plugin allow the direct creation and synchronisation of
git repositories with the InDefero database. This requires giving
access to the repositories using a dedicated SSH account, usually the
`git` account.

## Prerequisites

A good understanding of:

* the security issues related to using a SSH account on a server;
* the principle of public/private SSH keys;
* the rights/ownership of files on a Linux/BSD/nix system;

Yes, what you are going to do has security implications.

## Git user configuration

On your system, you will need to create a new `git` account. This
account will only be used to access the git repositories and at the
moment cannot be shared for other use.

First create a new git account:

    $ sudo adduser \
          --system \
          --shell /bin/sh \
          --gecos 'git version control' \
          --group \
          --disabled-password \
          --home /home/git \
          git

Then, we need to create the base SSH files with the right permissions:

    $ sudo su git
    $ mkdir /home/git/.ssh
    $ touch /home/git/.ssh/authorized_keys
    $ chmod 0700 /home/git/.ssh
    $ chmod 0600 /home/git/.ssh/authorized_keys
    $ exit

We add the `www-data` user to the `git` group so it can access the
repositories to read the content:

    $ sudo usermod -a -G git www-data

Do not forget to restart Apache or your fastcgi process to take the
group addition into account.

## Creation of the repositories base

For each project using git in InDefero a corresponding bare repository
will be created in `/home/git/repositories`. For example, if the
shortname of your project is `wonder`, it will be created in
`/home/git/repositories/wonder.git`

    $ sudo -H -u git mkdir /home/git/repositories

## InDefero Configuration

First, you need to have python installed on your system to be able to
run the very small python script `gitserve.py` in the `scripts`
folder. Here is a configuration example:


    $cfg['git_repositories'] = '/home/git/repositories/%s.git';
    $cfg['git_remote_url'] = 'git://yourdomain.com/%s.git';
    $cfg['idf_plugin_syncgit_path_gitserve'] = '/home/www/indefero/scripts/gitserve.py'; # yes .py
    $cfg['idf_plugin_syncgit_path_authorized_keys'] = '/home/git/.ssh/authorized_keys';
    $cfg['idf_plugin_syncgit_sync_file'] = '/tmp/SYNC-GIT';
    # Remove the git repositories which do not have a corresponding project
    # This is run at cron time
    $cfg['idf_plugin_syncgit_remove_orphans'] = false;
    # git account home dir
    $cfg['idf_plugin_syncgit_git_home_dir'] = '/home/git'; 
    # where are going to be the git repositories
    $cfg['idf_plugin_syncgit_base_repositories'] = '/home/git/repositories'; 

When someone will change his SSH key or add a new one, the
`/tmp/SYNC-GIT` file will be created. The cron job
`/home/www/indefero/scripts/gitcron.php` will see the file and update
the content of the `authorized_keys` file.

## Cron Job Configuration

You need to run a cron job every now and then to synchronize the SSH
keys. The command to run in the cron job is:

    php /home/www/indefero/scripts/gitcron.php

The user of the cron job must be `git`.

## Git daemon configuration

Put in `/etc/event.d/local-git-daemon` the following:

    start on startup
    stop on shutdown
    
    exec /usr/bin/git-daemon \
    	--user=git --group=git \
    	--verbose \
    	--reuseaddr \
    	--base-path=/home/git/repositories/ \
    	/home/git/repositories/
    respawn

Then run:

    $ sudo start local-git-daemon