Git-Repository.md

+The official source for Emulab is kept in a set of Git repositories. For
+general information about Git, see
+[http://git-scm.com](http://git-scm.com) or [http://progit.org](http://progit.org). 
+
+### Available Repositories
+
+There are two Emulab repositories available.
+
+  * A stable repository, called **emulab-stable**, which contains code
+    after it has been vetted (eg. after it has run for a while on the Utah
+    Emulab site). We recommend that most people use this repository. 
+  * A development repository, called **emulab-devel**, which contains the
+    latest "bleeding edge" changes to the code base. This code may not
+    necessarily be tested well, or at all. 
+
+We have also created a [repository for "contributed
+code"](https://wiki.emulab.net/wiki/ContribRepository?searchterm=contrib)
+which will contain code contributed by other developers.
+
+All of our public repositories can be browsed at
+[https://gitlab.flux.utah.edu/emulab](https://gitlab.flux.utah.edu/emulab). 
+
+### Anonymous Read-Only Access to Emulab Git
+
+We provide anonymous read-only access to the Emulab Git repository via HTTPs.
+The **emulab-stable** repository may be cloned using the following
+<tt>git</tt> command: 
+```
+git clone https://gitlab.flux.utah.edu/emulab/emulab-stable
+```
+
+The **emulab-devel** repository may be cloned as follows:
+```
+git clone https://gitlab.flux.utah.edu/emulab/emulab-devel
+```
+
+Once you have a Git checkout, following the instructions for
+[upgrading](https://gitlab.flux.utah.edu/emulab/emulab-devel/wikis/install/Updating%20Emulab%20Software)
+your site. 
+
+### Updating From Old Repository Locations
+
+If you have a git clone from one of our old repositories on
+git-public.flux.utah.edu, you can apply the appropriate command below to
+point it to the newer GitLab location: 
+
+For **emulab-stable** repositories:
+```
+git remote set-url origin https://gitlab.flux.utah.edu/emulab/emulab-stable
+```
+
+For **emulab-devel** repositories:
+```
+git remote set-url origin https://gitlab.flux.utah.edu/emulab/emulab-devel
+```
+
+### Contributing to the Emulab code
+
+The [GitLab](https://gitlab.flux.utah.edu) site that we use to host Emulab
+operates much like GitHub and other git hosting services, so to contribute
+to Emulab development you can: 
+
+  * Watch or submit
+    [issues on the emulab-devel repository](https://gitlab.flux.utah.edu/emulab/emulab-devel/issues).
+  * Fork the [emulab-devel repository](https://gitlab.flux.utah.edu/emulab/emulab-devel), 
+    push up changes, and submit a Merge Request.
+
+To do either of these, you will need an account on
+[GitLab](https://gitlab.flux.utah.edu); our GitLab site has open
+registration, so just click on the "Sign In" button and make a new account.
+