#!/bin/sh
#
# Copyright (c) 2008 Stephen Haberman
#
# Auto-deploys the contents of the gitconfig branch to $GIT_DIR.
#
# The config file is handled specially--instead of the $GIT_DIR's config file
# being copied over entirely, the gitconfig:config is evaluated line by line
# with calls to `git config`. This means you can have settings in
# $GIT_DIR/config that are not in the gitconfig:config and they will not be
# overwritten.  Deleting $GIT_DIR/config entries has to be manually.
#
# Hooks are copied over entirely, but old ones are not deleted. Deleting
# existing hooks has to be done manually.
#

while read oldrev newrev refname ; do
	if [ "$refname" == "refs/heads/gitconfig" ] ; then
		config_hash=$(git ls-tree $newrev | grep config | grep -oP '\w{40}')
		if [[ "$config_hash" != "" ]] ; then
			git cat-file blob "$config_hash" | while read line ; do
				key="${line%=*}"
				value="${line#*=}"
				git config "${key}" "${value}"
			done
		fi

		hooks_hash=$(git ls-tree $newrev | grep hooks | grep -oP '\w{40}')
		if [[ "$hooks_hash" != "" ]] ; then
			git ls-tree "$hooks_hash" | while read mode type file_hash file_name ; do
				echo "Installing $file_name"
				git cat-file blob "$file_hash" > "hooks/$file_name"
			done
		fi

		git ls-tree $newrev | grep -v hooks | grep -v config | grep blob | while read mode type file_hash file_name ; do
			echo "Installing $file_name"
			git cat-file blob "$file_hash" > "$file_name"
		done
	fi
done