# Running octocatalog-diff from a branch

When we are assisting with troubleshooting, or implementing a feature you've requested, we may ask you to run `octocatalog-diff` from a non-master branch to try it out.

This document is intended for people who may not be familiar with git, GitHub, and/or ruby. If you already know how to do this in another way, feel free!

## Installation

1. Determine the branch name. If there's an open Pull Request, you can see the branch name near the top of the page.

    ![Pull Request branch](/doc/images/pull-request-identify-branch.png)

1. Clone the `octocatalog-diff` repository in your home directory. From the command line:

    ```
    cd $HOME
    git clone https://github.com/github/octocatalog-diff.git
    ```

1. Change into the directory created by your checkout:

    ```
    cd $HOME/octocatalog-diff
    ```

1. Check out the branch you wish to use, filling in the branch name you determined in the first step:

    ```
    git checkout BRANCH_NAME_FROM_STEP_1
    ```

1. Bootstrap the repository to pull in dependencies:

    ```
    ./script/bootstrap
    ```

1. Optional but recommended - run the test suite:

    ```
    rake
    ```

## Use

Now that you have `octocatalog-diff` checked out and bootstrapped, it's time to use it.

We've created a wrapper script to make this easier for you.

1. Change directories to the location where you ordinarily run `octocatalog-diff` (for example: in your Puppet repository).

    ```
    cd /etc/puppetlabs/code
    ```

1. Run the `script/octocatalog-diff-wrapper` script from *this* checkout. For example, if you checked out `octocatalog-diff` to your home directory, you could use:

    ```
    $HOME/octocatalog-diff/script/octocatalog-diff-wrapper <options>
    ```

:warning: Note: If you are requesting our help, please use the debug option (`-d`) to display debugging information.