Shell script to create a detached working directory

git-detached

#!/bin/bash

if [ $# -lt 2 ]
then
	echo "usage error: $0 <git dir> <work tree>"
	exit 1;
fi
CWD=`pwd`

if [ ! -d $1 ]
then 
	mkdir $1;
fi

cd $1;
D1=`pwd`

cd $CWD;

if [ ! -d $2 ]
then
	mkdir $2;
	echo "Created worktree at: $2"
fi

cd $2;
D2=`pwd`

cd $D1

git status &> /dev/null

if [ ! $? -eq 128 ]
then
	echo "$1 is already an initialised git tree";
	exit 1;
fi

git init --bare

git config core.worktree $D2
echo "Configured work tree at "$D2
git config core.bare false
git config receive.denycurrentbranch ignore

echo "#!/bin/sh" > hooks/post-receive
echo "git checkout -f" >> hooks/post-receive
chmod +x hooks/post-receive