#!/bin/bash

# .git/hooks/pre-receive

SCRIPTPATH=$(dirname $(realpath -s $0))
BRANCH="master"

while read oldrev newrev ref
do
	if [ "$ref" = "refs/heads/$BRANCH" ];
	then
		echo "Ref $ref received. Deploying ${BRANCH} branch to production..."
		if [ ! git diff --name-only $1..$2 | grep 'post-receive' ]; then
			echo "Updated post-receive hook detected. Installing..."
			git archive $newrev | tar -x -C /tmp/newrev
			cp /tmp/newrev/post-receive $SCRIPTPATH/post-receive
			rm -rf /tmp/newrev
		fi
	else
		echo "Ref $ref received. Doing nothing: only the ${BRANCH} branch may be deployed on this server."
	fi
done