Problem with git-push (newbie)

rm -Rf /tmp/public/
mkdir  /tmp/public/
cd     /tmp/public/
echo 0 > VERSION
git init
git add VERSION
git commit -a -m 'Create empty repo'

rm -Rf /tmp/here/
mkdir  /tmp/here/
cd     /tmp/here/
git clone /tmp/public/ .
echo 1 > VERSION
echo 2 > otherfile
git add VERSION otherfile
git commit -a -m 'Version 1'
git push
#   ^ error messages:
# Counting objects: 6, done.
# Delta compression using up to 4 threads.
# Compressing objects: 100% (2/2), done.
# Writing objects: 100% (4/4), 288 bytes, done.
# Total 4 (delta 0), reused 0 (delta 0)
# Unpacking objects: 100% (4/4), done.
# remote: error: refusing to update checked out branch: refs/heads/master
# remote: error: By default, updating the current branch in a non-bare repository
# remote: error: is denied, because it will make the index and work tree inconsistent
# remote: error: with what you pushed, and will require 'git reset --hard' to match
# remote: error: the work tree to HEAD.
# remote: error:
# remote: error: You can set 'receive.denyCurrentBranch' configuration variable to
# remote: error: 'ignore' or 'warn' in the remote repository to allow pushing into
# remote: error: its current branch; however, this is not recommended unless you
# remote: error: arranged to update its work tree to match what you pushed in some
# remote: error: other way.
# remote: error:
# remote: error: To squelch this message and still keep the default behaviour, set
# remote: error: 'receive.denyCurrentBranch' configuration variable to 'refuse'.
# To /tmp/public/
#  ! [remote rejected] master -> master (branch is currently checked out)
# error: failed to push some refs to '/tmp/public/'