Suppose
svn-working-copy
is a working copy of the svn repo.hgimportsvn svn-working-copy hg-repo
Pull all SVN history with hgpullsvncd hg-repo
hgpullsvn
Do an update for good measurehg update (optional)
Clean up the .svn and .hgignore directories.cd hg-repo
find . -name .svn | xargs -0 rm -rf
find . -name .hgignore | xargs -0 rm -rf
Done. Yay.