#!/bin/bash
#
# This script will set-up added users.
#
# Written by Alessandro Lo-Presti (Agilo).
# E-mail: agilo3@gmail.com
#

UDEBUG=1;	# uncomment to enable debugging.
UTMPDIR="/tmp"	# Temporary directory.

if [ "$1" == "postinstall" ]; then
 [ $UDEBUG ] && echo "DEBUG: Post-install started.";

 [ $UDEBUG ] && echo "DEBUG: Step 3 - Verifying if a user was added.";
 if [ "$(diff /etc/passwd $UTMPDIR/passwd.old | grep '<')" ]; then
  [ $UDEBUG ] && echo "DEBUG: At least one line changed.";

  if [ $(diff /etc/passwd $UTMPDIR/passwd.old | grep "<" | wc -l) -gt 1 ]; then
   [ $UDEBUG ] && echo "DEBUG: Multiple lines have changed.";
    for i in $(diff /etc/passwd $UTMPDIR/passwd.old | grep "<" | awk -F":" '{print $6}'); do
     [ $UDEBUG ] && echo "DEBUG: Step 4 - Processing: $i";

     [ $UDEBUG ] && echo "DEBUG: Step 4.1 - Removing old home dir.";
     gksudo "mv $i /home/oldusers/"

     [ $UDEBUG ] && echo "DEBUG: Step 4.2 - Copying new home dir.";
     gksudo "cp -r /home/templateuser $i"

     [ $UDEBUG ] && echo "DEBUG: Step 4.3 - Setting up rights to new home dir.";
     gksudo "chown -R $(echo $i | awk -F"/" '{print $3}'):users $i"

    done
  else
   [ $UDEBUG ] && echo "DEBUG: Only one line changed.";
   USERHOMEDIR="$(diff /etc/passwd $UTMPDIR/passwd.old | grep "<" | awk -F":" '{print $6}')";

   [ $UDEBUG ] && echo "DEBUG: Step 4 - Processing: $USERHOMEDIR";

   [ $UDEBUG ] && echo "DEBUG: Step 4.1 - Removing old home dir.";
   gksudo "mv $USERHOMEDIR /home/oldusers/"

   [ $UDEBUG ] && echo "DEBUG: Step 4.2 - Copying new home dir.";
   gksudo "cp -r /home/templateuser $USERHOMEDIR"

   [ $UDEBUG ] && echo "DEBUG: Step 4.3 - Setting up rights to new home dir.";
   gksudo "chown -R $(echo $USERHOMEDIR | awk -F"/" '{print $3}'):users $USERHOMEDIR"
  fi

 else
  [ $UDEBUG ] && echo "DEBUG: Nothing to do, no users were added. Exiting normally."
 fi

 [ $UDEBUG ] && echo "DEBUG: Deleting copied passwd file."
 rm $UTMPDIR/passwd.old

else
 [ $UDEBUG ] && echo "DEBUG: Step 1 - Copying passwd for differentiation.";
 [ -e $UTMPDIR ] && [ -w $UTMPDIR ] && cp /etc/passwd $UTMPDIR/passwd.old
 [ $? != 0 ] && echo "Unable to copy passwd file, exiting." && exit 1;

 [ $UDEBUG ] && echo "DEBUG: Step 2 - Running users-admin and usersetup.";
 gksudo users-admin && gksudo $0 postinstall
fi