git-svn fetch fail

[gepa21]

Trying to fetch Bullet Physics fails with message :
Invalid filesystem path syntax: REPORT request failed on '/svn/!svn/vcc/default'
: Target path '/trunk' does not exist at /usr/lib/perl5/site_perl/Git/SVN/Ra.pm
line 282

But the bullet physics has a trunk :
https://code.google.com/p/bullet/source/browse/

Steps to reproduce :

1. add remote :
   [svn-remote "svn_upstream"]
   url = http://bullet.googlecode.com/svn/trunk
   fetch = :refs/remotes/svn_upstream

2. fetch
   $ git svn fetch svn_upstream

Result :
Invalid filesystem path syntax: REPORT request failed on '/svn/!svn/vcc/default'
: Target path '/trunk' does not exist at /usr/lib/perl5/site_perl/Git/SVN/Ra.pm
line 282

[gepa21]

ok, i finally found how to make it work.. it seems i had to do :
[svn-remote "svn"]
url = http://bullet.googlecode.com/svn
fetch = trunk:refs/remotes/trunk

although this is the only repository the previous way didn't work.. but it works with this :)