How to force subversion to ask for username at a commit

Hello subversion users

I have a problem that maybe some others have encountered in the past before.

We have here a simulation lab with several pc's. On each machine (linux) is the same repository checked out with the same username. Password storing is enabled, so users do not enter a password when updating the working copy. The most time we develop software for this lab in our office where each user commits changes with his user name on his pc. When it comes to integration and testing in the lab we do a lot of additions of code in the lab on some of the pc's and we have to update all others with an svn update. So far so good. The problem is, that all commits done in the lab are done with the user the repo was checked out with and no one can realy figure out who made which changes. I would like to be able to do updates with the user that checked out the repo without entering any password and get asked by subversion at a commit for a user and password.
What I tried so far was that I gave this lab checkout user only read access to the repo and all others read/write access, enabled password storing only during the first checkout so that this single password was stored in the auth section of my .subversion folder. Disabled the password section afterwards and tried to commit changes. I only get the error that it is forbidden for this user, because it tries to use the user which checked out the working copy. Is there a way to force the svn client to ask for a user name when commiting and still can do svn updates with the lab user without entering any passwords? Maybe a wrapper script around svn? Or is there any internal configuration settings I can use?

On my local machine I am using subversion 1.4
On the server is currently a 1.3.2 installed

Thanks for any hints and tips.

Andreas Benzler

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