Support for a custom gitlab-shell script in config

[pspoerri]

Overwrite script gitlab-shell script location in config.yml.
Possible uses:

• Setup a custom Ruby Environment and wrap gitlab shell script
• Add some additional checks

I'm aware of issue https://github.com/gitlabhq/gitlab-shell/issues/12 . But the suggested solution namely setting

PermitUserEnvironment yes 

in the SSH config will introduce additional problems which we don't want:

• We increase the risk for an incursion.
• It makes the management of a machine running gitlab a nightmare. Since the sshd config needs to be managed somehow.

Hence I suggest the following solution which allows overwriting the gitlab-shell binary with a custom script defined in the gitlab-shell config:

• The config can be deployed with puppet.
• The binary can contain whichever ruby version settings want.
• The default config will still use the default script.
• The solution is gitlab-shell version agnostic: Update gitlab-shell, keep the edited script.

An alternative would be to just overwrite gitlab-shell script and edit with every update. Which makes upgrading a pain.

[coveralls]

Coverage increased (+0%) when pulling 8679bff on minusinf:master into 2fb506d on gitlabhq:master.

[pspoerri]

This pull request can be closed since I didn't notice that it is sufficient to setup the environment in /home/git/.bashrc in the following way:

export PATH=/usr/local/rvm/gems/ruby-1.9.3-p429@gitlab/bin:/usr/local/rvm/gems/ruby-1.9.3-p429/bin:/usr/local/rvm/gems/ruby-1.9.3-p429@global/bin:/usr/local/rvm/rubies/ruby-1.9.3-p429/bin:/usr/local/rvm/bin:/usr/bin:/bin export GEM_PATH=/usr/local/rvm/gems/ruby-1.9.3-p429@gitlab:/usr/local/rvm/gems/ruby-1.9.3-p429@global # If not running interactively, don't do anything [ -z "$PS1" ] && return # rest of the .bashrc