Whilst doing git svn clone -s https://svn.example.com/repo/ I received the following output:
git svn clone -s https://svn.example.com/repo/
r3073 = a6132f3a937b632015e66d694250da9f606b8333 (r
I believe the problem with spaces is fixed in Git >= 1.8.0 (See: #786942).
So you should upgrade it.
I've tested it and it seems to work in the recent version of git.
See GitHub Home page: https://github.com/git/git