#!/bin/sh

mountdef="$(grep -Eo 'home=[^ ]+' /proc/cmdline)"
mountdef="${mountdef#home=}"
mountpath="${mountdef%%;*}"
mountpath="${mountpath#*://}"
mounttype="${mountdef%%://*}"
mountopts="${mountdef#*;}"

macaddr="$(ip address show |grep -Eom1 'link/ether [0-9a-fA-F:]+' |tr : _)"
macaddr="${macaddr#link/ether }"

[ "$mounttype" = "$mountdef" ] && mounttype=auto
[ ! "$macaddr" ] && macaddr=noname

if [ "$mountpath" -a "$mountopts" ]; then
  mount -t "$mounttype" "$mountpath" /home -o "$mountopts"
elif [ "$mountpath" ]; then
  mount -t "$mounttype" "$mountpath" /home
fi

usermod -d "/home/${macaddr}/" guest