Merge tags from multiple refs

#!/bin/sh

rm -rf origin client
git init origin
( cd origin
  echo 'A file' > file.txt
  git add file.txt
  git commit -m 'Initial commit' )
git clone origin client
cat > client/.git/config <<EOF
[core]
        repositoryformatversion = 0
        filemode = true
        bare = false
        logallrefupdates = true
        ignorecase = true
        precomposeunicode = true
[remote "origin"]
        url = /Users/christian.goetze/git/tag-merge-demo/origin
        fetch = +refs/heads/*:refs/remotes/origin/*
        fetch = +refs/private/tags/*:refs/tags/*
[branch "master"]
        remote = origin
        merge = refs/heads/master
        rebase = true
EOF

( cd client
  git tag PUBLIC_TAG
  git push origin 'refs/tags/PUBLIC_TAG:refs/tags/PUBLIC_TAG'
  git tag PRIVATE_TAG
  git push origin 'refs/tags/PRIVATE_TAG:refs/private/tags/PRIVATE_TAG'
  git remote show origin
  git fetch --prune
  git tag )