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====== Accessing a Subversion Repository ======

This page explains how to access a [[http://subversion.tigris.org|Subversion (svn)]] repository.  This page is primarily for UNIX and Mac (Leopard) users.  Windows instructions are [[using_subversion_from_windows|here]].  See [[administering_subversion|this page]] for setup and administrative information.

====== Creating an SSH Key for Access to the Repository ======

On a UNIX system, use ''ssh-keygen'' to create a public/private key pair.  Give it a host-specific name (to distinguish it from any other ssh keys you may have) and store it in the default directory (''~/.ssh''):

  % ssh-keygen -t rsa -f ~/.ssh/id_rsa_svn1

''ssh-keygen'' will prompt you for a passphrase to lock the key.  This protection is not necessary; you can skip it by pressing ''ENTER'' twice.  ''ssh-keygen'' will create two files in your ''~/.ssh'' directory, with the private key in ''id_rsa_svn1'' and the public key in ''id_rsa_svn1.pub''.  

Send the repository administrator a copy of your public key file, ''id_rsa_svn1.pub'', who will then create an svn account for you and tie your public key to that account.
====== Setting Up Your Working Environment for Repository Access ======

While waiting for the administrator to create your svn account, you can read the svn [[http://svnbook.red-bean.com/en/1.4/svn.tour.html|tour]] or [[http://subversion.tigris.org|other]] documentation and set up your UNIX environment for svn access.

If you're only dealing with this one repository (i.e., you're not involved in any other projects that use svn), then it is simplest to just set the ''SVN_SSH'' environment variable to turn on ssh key access and log you in to the server account.  For example, bash users edit ''~/.bashrc'' to include (note that ''svn_login'' is specific to the host where the repository is stored; your administrator should provide this information):

  SVN_SSH="ssh -i $HOME/.ssh/id_rsa_svn1 -l svn_login"
  export SVN_SSH
  
For Mac users (and perhaps any UNIX users) it might be necessary to add a "-q" option to the ssh command to suppress a spurious "Killed by signal 15" message.

Once your svn account is created, cd to a suitable directory and get a copy of the repository (''host'' is also site specific and should be provided by your administrator):

  % svn checkout svn+ssh://host.cs.purdue.edu repository

These commands create a ''repository'' subdirectory with a complete copy of the source code repository.  The repository may be organized as [[http://svnbook.red-bean.com/en/1.4/svn.reposadmin.planning.html#svn.reposadmin.projects.chooselayout|recommended by the svn community]]: one directory per "project", with each project containing a ''branches'', ''tags'', and ''trunk'' subdirectory.  You'll notice that the repository directory contains two subdirectories: skeletons for "project1" and "project2".  The main place to create files (e.g., source code) is in the ''trunk'' directory.  Start there.

====== Creating a New Project ======

The basic steps for adding a new project are to start in the repository directory, make sure you are up-to-date, create the directory structure, add to the project, then commit:

  % cd repository
  % svn update
  % mkdir project3 project3/branches project3/tags project3/trunk
  % svn add project3
  % svn commit

Create your first file(s) in ''project3/trunk''.