Description of problem:
Failed to perform git pull while deploying rails according to instructions on github.

Version-Release number of selected component (if applicable):
rhc-cartridge-rack-1.1-0.88.1-1.el6_2.noarch

How reproducible:
Always

Steps to Reproduce:
1.Create a rails application
$ rhc app create -a railsapp -t ruby-1.8
2.Add mysql support to your application
$ rhc app cartridge add -a railsapp -c mysql-5.1
3.Add this upstream rails quickstart repo
$ cd railsapp
$ git remote add upstream -m master git:openshift/rails-example.git
$ git pull -s recursive -X theirs upstream master
  
Actual results:
<----------------output------------>
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
<---------------------------------->

Expected results:
Git pull should succeed.

Additional info: