checkout-cache -f: a better way?

Being a weirdo, I don't use cogito for kernel development, just git itself. I store branches in .git/refs/heads/ per the defacto standard, and use the attached script to switch the working directory from one branch to another.

Problem is, 'git-checkout-cache -q -f -a' really pounds the disk, and takes quite a while.

Is there any way to avoid -f, while ensuring that the working directory truly represents the new branch?

BitKeeper has a secret checkout arg '-S', which will leave files untouched if the mtime/size information is unchanged.

	Jeff

#!/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