#!/bin/bash
if [ -z "$1" ] || [ -z "$2" ]; then
	echo "Usage: $0 <username> <chroothome>"; exit 1
fi

CHROOT_USERNAME="$1"
CHROOT_GROUP="$(id -gn $CHROOT_USERNAME)"
CHROOT_HOME="$2"
CHROOT_SHARED="/home/.chroot"

SDIR="$(pwd)"

test -d "$CHROOT_HOME" || mkdir -p "$CHROOT_HOME"
cd "$CHROOT_HOME"

mkdir -p bin dev etc usr usr/bin usr/lib usr/lib/ssh lib

mknod -m 0666 dev/tty c 5 0
mknod -m 0644 dev/urandom c 1 9

cp /etc/nsswitch.conf etc
touch etc/resolv.conf etc/profile

echo "order hosts" > etc/host.conf
echo "127.0.0.1 localhost" > etc/hosts

egrep "^(root|$CHROOT_USERNAME)" /etc/passwd > etc/passwd
egrep "^(root|$CHROOT_GROUP)" /etc/group > etc/group

mkdir .ssh
touch .ssh/known_hosts
chown "$CHROOT_USERNAME:$CHROOT_GROUP" .ssh/known_hosts

ln "$CHROOT_SHARED"/bin/* bin/ &>/dev/null
ln "$CHROOT_SHARED"/lib/* lib/ &>/dev/null
ln "$CHROOT_SHARED"/usr/bin/* usr/bin/ &>/dev/null
ln "$CHROOT_SHARED"/usr/lib/* usr/lib/ &>/dev/null
ln "$CHROOT_SHARED"/usr/lib/ssh/* usr/lib/ssh/ &>/dev/null

echo -e "#!/bin/bash\nid -Gn" > usr/bin/groups
chmod +x usr/bin/groups

cd "$SDIR"