Short script to do it all: (it's not perfect, but it does the job...)
#!/bin/bash
# variables:
# existing svn repository
SVNREPO=$1
# new git repository
GITREPO=$2
# username
# SVNUSERNAME=$3
# DO THIS FIRST TO CREATE USERLIST: (just do it manually, and add all users into one big file)
# for getting authors
# svn log $SVNREPO -q | awk -F '|' '/^r/ {sub("^ ", "", $2); sub(" quot;, "", $2); print $2" = "$2" <"$2">"}' | sort -u > ~/svn_convert/authors-transform.txt
#now edit ~/svn_convert/autors-transform.txt
#create temporary git folder
mkdir git_tmp_repo
cd git_tmp_repo
#clone repo to git
git svn clone --no-metadata -A ~/svn_convert/authors-transform.txt . -T $SVNREPO
#optimize repo
git gc
git fsck
# clean SVN sections from Git
git config --remove-section svn
git config --remove-section svn-remote.svn
rm -rf .git/svn .git/{logs/,}refs/remotes/svn/
# add remote
git remote add origin $GITREPO
# push to master
git push -u origin master
# remove temporary git folder
cd ..
rm -rf git_tmp_repo
