Initialise a git repo for which push -f works out-of-the-box, and automatically resets to the updated commit.

init_git_repo.sh

#!/bin/bash

git init
git config receive.denyCurrentBranch ignore
touch .git/hooks/post-receive
chmod +x .git/hooks/post-receive

cat >> .git/hooks/post-receive << EOF
#!/bin/bash

test "\${PWD%/.git}" != "\$PWD" && cd .. 
unset GIT_DIR GIT_WORK_TREE

git reset --hard
EOF