Modifying Plugins and Subversion

Hello,

I'm new to both Rails and Subversion so please bear with me.

Let's say I install a plugin with --externals set, and then make some
custom modifications to the plugin... If I perform a commit on my
local project, will my plugin modifications commit to the svn server I
initially dloaded from or to local? If the commit goes to the
remote svn server, I imagine I shouldn't do this... If so, should I be
installing the plugin locally first if I plan to make custom
modifications and use subversion to track my revisions? Will using
'install --checkout' allow me to do this?

Hope that made sense. Thanks.

You'll have to use something like Piston. I've never used it myself,
but it seems like this is what you need.

http://piston.rubyforge.org/

That looks like it should do the trick. Thanks.