Subversion Repositories livecd

#!/bin/bash

#

################################################################

#

# Enable or disable auto login to the system

#

# Urs Beyerle

#

################################################################

function usage() {

   ## Usage

   # ----------------------------------------------------------

   cat <<EOF

Enable or disables auto login

Usage: 

   livecd-autologin [-h] [-u <user>] [-s <session> ] on | off

   on:   enable autologin to system

   off:  disable autologin to system

   Optional Options:

   -u <user>:     define user for auto login, default is sluser

   -s <session>:  define session startup command, default is icewm-session

   -h:            print this screen

   Note: Works only for users with bash shell.

EOF

}

###############################################################

### definitions

###############################################################

AUTOLOGIN=""

ROOTLOGIN=""

LOCALUSER_EXISTS=""

LOCALUSER="sluser"

STARTSESSION="icewm-session"

###############################################################

### Read options from command-line

###############################################################

if [ $# -eq 0 ]; then

     usage; exit

fi

while [ $# -gt 0 ]; do

    case "$1" in

       -h)

            usage; exit;;

       -u)

            shift; LOCALUSER=$1; shift; continue;;

       -s)

            shift; STARTSESSION=$1; shift; continue;;

       on)

            AUTOLOGIN=on; shift; continue;;

       off)

            AUTOLOGIN=off; shift; continue;;

       *)

            usage; exit;;

    esac

done

###############################################################

### User

###############################################################

### test if $LOCALUSER exists

id $LOCALUSER >/dev/null 2>&1

[ "$?" = "0" ] && LOCALUSER_EXISTS="true"

### home directory of $LOCALUSER

[ $LOCALUSER_EXISTS ] && LOCALUSER_HOME=$(grep "^${LOCALUSER}:" /etc/passwd | cut -d":" -f6)

### warn message

[ ! $LOCALUSER_EXISTS ] && echo "$LOCALUSER does not exisit. Create user first and run script again."

###############################################################

# Enable autologin 

###############################################################

if [ $AUTOLOGIN = on ]; then

    echo "Enable auto login for $LOCALUSER ..."

    ### backup /etc/inittab

    echo " - Backup /etc/inittab"

    if [ ! -f /etc/inittab.no_autologin ]; then

	cp -a /etc/inittab /etc/inittab.no_autologin

    fi

    ### change init runlevel to 3

    echo " - Change init runlevel to 3"

    sed -i "s/id\:.\:initdefault/id\:3\:initdefault/" /etc/inittab

    ### autologin at tty6

    echo " - Modify /etc/inittab"

    line="6:2345:respawn:\/sbin\/mingetty --autologin $LOCALUSER tty6"

    sed -i "s/.*respawn.*tty6.*/$line/" /etc/inittab

    if [ $LOCALUSER_EXISTS ]; then

	echo " - Create user files ~/.xinitrc, ~/.xsession"

        ### create .xinitrc for LOCALUSER

	XINITRC=$LOCALUSER_HOME/.xinitrc

	echo "[ -x ~/autostart ] && ~/autostart" > $XINITRC

	echo "exec $STARTSESSION" >> $XINITRC

	chmod 755 $XINITRC

        ### link .xsession to .xinitrc

	ln -sf .xinitrc $LOCALUSER_HOME/.xsession

	echo " - Modify user file ~/.bashrc"

        ### run startx  (over .bashrc) at autotlogin of LOCALUSER and root

	grep -q "/dev/tty6" $LOCALUSER_HOME/.bashrc >/dev/null 2>&1

	if [ "$?" = "1" ]; then

	    echo 'if [ "$( tty )" = "/dev/tty6" ]; then startx; fi' >> $LOCALUSER_HOME/.bashrc

	fi

    fi

    echo "done."

fi

###############################################################

# Disable autologin 

###############################################################

if [ $AUTOLOGIN = off ]; then

    echo "Disable auto login for $LOCALUSER ..."

    ### restore /etc/inittab

    echo " - Restore original /etc/inittab"

    if [ -f /etc/inittab.no_autologin ]; then

	mv /etc/inittab.no_autologin /etc/inittab

    else

	# fall back if no original /etc/inittab found

	sed -i "s|.*respawn.*tty6.*|6:2345:respawn:/sbin/mingetty tty6|" /etc/inittab

    fi

    ### disable auto login for $LOCALUSER and root 

    if [ $LOCALUSER_EXISTS ]; then

	echo " - Delete user files ~/.xinitrc, ~/.xsession"

        # remove .xinitrc

	[ $LOCALUSER_EXISTS ] && rm -f $LOCALUSER_HOME/.xinitrc

        # remove link .xsession

	[ $LOCALUSER_EXISTS ] && rm -f $LOCALUSER_HOME/.xsession

	echo " - Modify user file ~/.bashrc"

        # remove startx line from .bashrc

	[ $LOCALUSER_EXISTS ] && sed -i "/.*\/dev\/tty6.*then startx.*/d" $LOCALUSER_HOME/.bashrc

    fi

    echo "done."

fi

###############################################################

# Final note

###############################################################

echo

echo "Please note, you may have to reboot to make the changes active."

echo