Redmine

percy li wrote:

(1) Add a button in the "Repository Setting" page, in order to create a new subversion repository and use it immediately.

There is already a script to generate subversion repositories. Its documented as HowTo Automate repository creation. This script could be fairly easily integrated into a post-creation hook or a button with a small plugin.

(2) Let users in Redmine system be able to authenticate subversion smoothly. (built-in support, not by apache's mod_auth_mysql etc.)

I don't think that's possible as repositories would have to be served through redmine itself. I think this is

1. out of scope for Redmine
2. hard to achieve regarding the many different deployment strategies

I think the webserver (or whatever system you use for your specific repository needs) is a better place to handle these diverse authentication issues.

(3) Manage ACLs (whether a user has permission to read/write a subversion repository) and authenticate logins according to the ACLs.

Using Apache modules and the integration features of Redmine.pm (see Repositories access control with apache mod_dav_svn and mod_perl). There are still some outstanding features like #3712 though. What's so bad about mod_auth_mysql or mod_dbd (see #4640)