Adventures in Git: Deploy on Push

For posterity, here's a small Git post-receive script to update a checkout when the bare repository receives a push:

GIT_WORK_TREE=/path/to/git/clone git checkout -f

Note that GIT_WORK_TREE is the path to the checked-out files, not the bare repository. You can only push to bare repos! If you get this error message on push, make a bare repo with git init --bare and push to that instead.

Writing objects: 100% (3/3), 274 bytes, done.
Total 3 (delta 0), reused 0 (delta 0)
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 /path/to/repo
 ! [remote rejected] master -> master (branch is currently checked out)
 error: failed to push some refs to '/path/to/repo'