The `hooks/pre-receive` file I use for cameronmalek.com and other sites. It makes sure the working directory is clean before pushing updates, forcing the developer to commit and pull server-side updates first. It doesn't detect any staged, uncommitted files. A situation where someone stages but fails to commit a file isn't anticipated.

pre-receive.sh

#!/bin/sh
export GIT_WORK_TREE=/home/cameronm/public_html/
export GIT_DIR=/home/cameronm/git/cameronmalek.git

ec=0

# test for unstaged, uncommitted files
git diff --exit-code &>-
if [ "$?" -ne 0 ]; then
	echo "Changes not staged"
	ec=$(($ec + 1));
fi

# test for unadded files
if [ -z $(git ls-files --exclude-standard --others) ]; then
	exit 0;
else 
	echo "Unadded files"
	ec=$(($ec + 1));
fi

exit $ec;

Very nice and just what I was looking for ;-)

Would be interesting to see the "staged, but not committed files"-check added as well for completeness
``git diff --staged`

Another idea I'm playing with is to get the script to commit any changes before exiting and stopping the push, so the repo is "pull-ready" for the developer to merge the changes.
What are your thoughts on that ?

Very nice and just what I was looking for ;-)

Would be interesting to see the "staged, but not committed files"-check added as well for completeness
``git diff --staged`

Another idea I'm playing with is to get the script to commit any changes before exiting and stopping the push, so the repo is "pull-ready" for the developer to merge the changes.
What are your thoughts on that ?

Wow, 5 years later and I finally see this comment for the first time. These days I don't need a script like this since DevOps came around.