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+==================
+Proxy Repositories
+==================
+
+It's often the case that users wish to set up a maven/ivy proxy
+repository inside their corporate firewall, and have developer
+sbt instances resolve artifacts through such a proxy.  Let's detail
+what exact changes must be made for this to work.
+
+Overview
+========
+
+The situation arises when many developers inside an organization
+are attempting to resolve artifacts.  Each developer's machine
+will hit the internet and download an artifact, regardless of
+whether or not another on the team has already done so.  Proxy
+repositories provide a single point of remote download for an
+organization.  In addition to control and security concerns, 
+Proxy repositories are primarily important for increased speed
+across a team.
+
+.. image:: proxy-cloud-setup.png
+
+There are many good proxy repository solutions out there, with
+the big three being (in alphabetical order):
+
+* Archiva_
+* Artifactory_
+* Nexus_
+
+Once you have a proxy repository installed and configured,
+then it's time to configure SBT for your needs.
+
+
+sbt Configuration
+=================
+
+sbt requires configuration in two places to make use of a
+proxy repository.   The first is the ``~/.sbt/repositories``
+file, and the second is the launcher script.
+
+
+``~/.sbt/repositories``
+---------------------
+The repositories file is an external configuration for the
+:doc:`/Detailed-Topics/Launcher`.  The exact syntax for the
+configuration file is detailed in the :doc:`/Detailed-Topics/Blah`
+documentation.   
+
+Here's an example config:
+
+.. code-block:: ini
+
+    [repositories]
+      local
+      my-ivy-proxy-releases: http://repo.company.com/ivy-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]
+      my-maven-proxy-releases: http://repo.company.com/maven-releases/
+
+This example configuration has three repositories configured for sbt.
+
+The first resolver is ``local``, and is used so that artifacts pushed
+using ``publish-local`` will be seen in other sbt projects.
+
+The second resolver is ``my-ivy-proxy-releases``.   This repository
+is used to resolve sbt *itself* from the company proxy repository,
+as well as any sbt plugins that may be required.   Note that the
+ivy resolver pattern is important, make sure that yours matches the
+one shown or you may not be able to resolve sbt plugins.
+
+The final resolver is ``my-maven-proxy-releases``.  This repository
+is a proxy for all standard maven repositories, including
+maven central.
+
+
+Launcher Script
+---------------------
+The sbt launcher supports two configuration options that
+allow the usage of proxy repositories.  The first is the
+``sbt.override.build.repos`` setting and the second is the 
+``sbt.repository.config`` setting.
+
+``sbt.override.build.repos``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+This setting is used to specify that all sbt project added resolvers 
+should be ignored in favor of those configured in the ``repositories``
+configuration.  Using this with a properly configured
+``~/.sbt/repositories`` file leads to only your proxy repository
+used for builds.
+
+It is specified like so:
+
+.. code-block:: console
+
+    -Dsbt.override.build.repos=true
+
+
+
+``sbt.repository.config``
+~~~~~~~~~~~~~~~~~~~~~~~~~
+If you are unable to create a ``~/.sbt/repositories`` file, due
+to user permission errors or for convenience of developers, you
+can modify the sbt start script directly with the following:
+
+.. code-block:: console
+
+    -Dsbt.repository.config=<path-to-your-repo-file>
+
+This is only necessary if users do not already have their own default
+repository file.
+
+
+
+.. _Archiva: http://archiva.apache.org/
+.. _Artifactory: http://www.jfrog.com/home/v_artifactory_opensource_overview
+.. _Nexus: http://www.sonatype.org/nexus/
+
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