Issue using svn with svn+ssh:// protocol

[shawn99452]

Our SVN instance is configured using svn+ssh:// protocol; everyone connects using a public key. We use virtual users - everyone specifies the same linux user on the svn server, and the authorized_keys file on the server automatically maps the private key used to log in to the appropriate user using the --tunnel-user option. Normally, from the command line, we would use something like "svn checkout svn+ssh://SVN_USER@DOMAIN_NAME/project/trunk". On the web server, I've created a virtual user for Apache's user with read-only access to svn; using "sudo -u www-data svn ls SVN_PATH/@, I get a working listing of the remote repository, so mantis should work with it. I've tried configuring the URL similarly in SourceSVN, and get the error listed below. I've also tried omitting the user, and specifying it in the "svn user" section (leaving the password blank since we use keys), and that also fails (with a different less informative error).

I'm guessing that this isn't working because this is a fairly niche use of svn (we do this so we can have the repository externally available for remote work, without having to worry about credentials being guessed; normal user/password authentication is disabled), and to simplify deployment scripts on remote servers that pull from svn.

I've modified mantis a few times to fix issues and extend it, and am proficient in linux administration tasks, and am a senior full-stack software developer, so I'm ok with making code changes to make this work, but I wanted to see if anyone else had tried with a configuration like this, and I just don't have it set up correctly, or had pointers on where to start looking in the plugin to make this work right.

Error message when I try to use Import Latest Data, or Import Everything; happens immediately (I've replaced our svn user with SVN_USER below, and our domain name with DOMAIN_NAME):

APPLICATION ERROR #plugin_SourceSVN_svn_cmd

Subversion execution returned an error: "svn: E205000: Try 'svn help info' for more information svn: E205000: Syntax error parsing peg revision 'DOMAIN_NAME'; did you mean 'svn+ssh://SVN_USER@DOMAIN_NAME@'?". Please use the "Back" button in your web browser to return to the previous page. There you can correct whatever problems >were identified in this error or select another action. You can also click an option from the menu bar to go directly to a new >section.