quick, raw, git svn checkout.

gistfile1.py

from fabric.operations import local
from fabric.context_managers import cd, lcd

repo     = raw_input("URL: ")
dest_dir = raw_input("Dest Dir: ")


local("mkdir -p " + dest_dir)
local("git svn clone --stdlayout %(url)s %(dest)s" % { "url":  repo,
                                                       "dest": dest_dir })

with lcd(dest_dir):
    local("git-svn-clone-externals")

    local("git svn create-ignore")
    local("git commit")