#!/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"

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

cp /bin/bash /bin/ls /bin/mkdir /bin/mv /bin/pwd /bin/rm /bin/ping bin/
cp /usr/bin/id /usr/bin/ssh /usr/bin/scp usr/bin/
cp /usr/lib/ssh/sftp-server usr/lib/ssh/

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

cp \
/lib/ld-linux.so.2 \
/lib/libc.so.6 \
/lib/libcrypt.so.1 \
/lib/libdl.so.2 \
/lib/libhistory.so.4 \
/lib/libm.so.6 \
/lib/libncurses.so.5 \
/lib/libnsl.so.1 \
/lib/libnss_files.so.2 \
/lib/libnss_compat.so.2 \
/lib/libpthread.so.0 \
/lib/libpam.so.0 \
/lib/libpam_misc.so.0 \
/lib/libreadline.so.4 \
/lib/libresolv.so.2 \
/lib/librt.so.1 \
/lib/libutil.so.1 \
/lib/libz.so.1 \
lib/

cp \
/usr/lib/libcrypto.so.0.9.6 \
usr/lib/

cd "$SDIR"