<p>I found piston seems a decent tool for managing rails plugins, but when I try to do piston convert for my project with git based plugins, it just went dead completely and seems its trying to look for .svn with svn tools.</p>

<p>I am on piston 1.4.0, is that git natively supported or I would have to build from edge?</p>

I'm using piston 1.9.x for exactly this reason - since 1.9, it has
supported Git importing
.
Instructions on installing can be found
here
.