#!/bin/sh

if [ "x$1" != "x" ]
then
	if [ "$1" == "master" ]
	then
		( cd .git && rm -f HEAD && ln -s refs/heads/master HEAD )
	else
		if [ ! -f .git/refs/heads/$1 ]
		then
			echo Branch $1 not found.
			exit 1
		fi

		( cd .git && rm -f HEAD && ln -s refs/heads/$1 HEAD )
	fi
fi

git-read-tree $(cat .git/HEAD) && \
	git-checkout-cache -q -f -a && \
	git-update-cache --refresh