echo "This script sets up read permissions for the kernel's event devices 
in order for your user to be able to run WhatPulse. It will create a new
group called 'input', add your username to that group, and make the event
devices readable for the group. Press Ctrl+C now if you don't want this,
or press Return to continue."

read temp

if [ "`whoami`" != "root" ] ; then
    echo "This script must be run as root (e.g. using sudo). Will now exit."
    exit
fi

# set up persistent settings

if [ -r /etc/udev/rules.d/99-whatpulse-input.rules ] ; then
    echo "/etc/udev/rules.d/99-whatpulse-input.rules already exists. Will not change it."
else
    echo "KERNEL==\"event*\",       NAME=\"input/%k\", MODE=\"640\", GROUP=\"input\"" >> /etc/udev/rules.d/99-whatpulse-input.rules
    if [ $? != 0 ] ; then
        echo "There was some error creating the udev rule file. Sorry. Quitting."
        exit
    fi
    echo "UDEV rules file has been set up."
fi

if [ -n "`cat /etc/group | grep -e ^input:`" ] ; then
    echo "Group 'input' already exists!"
else
    groupadd input
    echo "Created group 'input'."
fi

echo "Please enter the username that should get added to the group:"
read username

if [ -z "$username" ] ; then
    echo "What do you mean by an empty username? Quitting."
    exit
fi

if [ -z "`cat /etc/passwd | grep -e ^$username:`" ] ; then
    echo "This username doesn't exist. Quitting."
    exit
fi

gpasswd -a $username input &> /dev/null
if [ $? != 0 ] ; then
    # maybe this is openSUSE (or a similar system)
    usermod -A input $username &> /dev/null
    if [ $? != 0 ] ; then
        echo "There was a problem adding your username to the group 'input'.
Please add your user to the 'input' group yourself."
    else
        echo "Added user '$username' to group 'input', using the special openSUSE method."
    fi
else
    echo "Added user '$username' to group 'input'."
fi
echo " "
echo "Setup of persistent permission settings complete."

# apply non-persistent settings so that no reboot is necessary :-)

echo " "
echo "Since the UDEV rules will only be applied when you restart your 
computer, this script will now apply temporary read permissions for all 
users to the device files to let you use WhatPulse immediately. You have 
the chance to cancel this by pressing Ctrl+C now (which you should do if 
you fear that other users on your computer might log your keyboard 
events!). Otherwise press Return to continue."

read temp

find /dev/input/ -iname 'event*' -exec chmod 644 {} \;

echo "All done, have fun using WhatPulse!"