#!/bin/bash
# fix-cdrom written by Joerg Schirottke (Kano), optimized by Locsmif, 2005-01-29

if [ $(id -u) != 0 ]; then
 echo Error: You must be root to run this script!
 exit 1
fi

CDINFO="/proc/sys/dev/cdrom/info"
VERBOSE="-v"
[ "$1" != "-v" ] && unset VERBOSE

function mkcdvdtable () { 
function mkarr () {
# split left and right by colon
IFS=":"; eval "$1=(\$2)"; unset IFS
# make the array $1 become it's own second element which is [1] (counting from zero)
# the second element is the right part of the colon
eval "$1=(\${$1[1]})"
}
# read the cdrom information file line-by-line, and make arrays out of important lines
while read L
do 
 case $L in 
  "drive name"*) mkarr DEV "$L";;
  *"write CD-R"*) mkarr BCD "$L";;
  *"write DVD-R:"*) mkarr BDVD "$L";;
  *"read DVD"*) mkarr RDVD "$L";; 
  *);;
 esac
# Had to use < <(cat ... ) because unpredictable behavior occured trying to read the special file with Bash
done < <(cat $CDINFO)
unset IFS
}

function cdvdp {
local I
for ((I=0;I<${#DEV[@]};I++))
do
# look device name up in array 
 [[ ${DEV[I]} = $(basename $1) ]] && break
done
# report back <device> <can burn cd> <can read dvd> <can burn dvd>
echo "${DEV[I]} ${BCD[I]} ${RDVD[I]} ${BDVD[I]}"
}

function isburner () { 
local DARR
DARR=($(cdvdp $1))
# array elements 1 and 3   (of 0 1 2 3)   tell us if it's a burner
((${DARR[1]} || ${DARR[3]})) && return 0 || return 1
}

function isdvd () { 
local DARR
DARR=($(cdvdp $1)) 
# return the inverse of the flag found (since in Bash, unlike boolean, exit code 0 is succesful and 1 is not)
return $((!${DARR[2]}))
}

function isdvdburner () {
local DARR
DARR=($(cdvdp $1))
# return the inverse of the flag found (since in Bash, unlike boolean, exit code 0 is succesful and 1 is not)
return $((!${DARR[3]}))
}

function create-symlink {
rm -f $2
ln $VERBOSE -s $1 $2
}

function fix-ide-perm {
chown root:disk /dev/hd*
unset CDROM DISK FLOPPY
for DEVICE in /proc/ide/hd?; do
 [ $(< $DEVICE/media) == cdrom ] && CDROM="$CDROM ${DEVICE##*/}"
 [ $(< $DEVICE/media) == disk ] && DISK="$DISK ${DEVICE##*/}"
 [ $(< $DEVICE/media) == floppy ] && FLOPPY="$FLOPPY ${DEVICE##*/}"
done
for DEVICE in $DISK; do
 chown $VERBOSE root.disk /dev/$DEVICE
done
for DEVICE in $FLOPPY; do
 chown $VERBOSE root.floppy /dev/$DEVICE
done
for DEVICE in $CDROM; do
 chown $VERBOSE root.cdrom /dev/$DEVICE
done
}

fix-ide-perm
mkcdvdtable
#CDROM="${DEV[@]}"
CDROM=$(awk '/name/{for (i=NF;i>=3;i--) {print $i}}' $CDINFO)
unset COUNT BURN_COUNT DVD_COUNT DVD_BURN_COUNT
rm -f /dev/cdrom* /dev/cdburner* /dev/dvd* /dev/cdaudio*
for DEVICE in $CDROM; do
 create-symlink /dev/$DEVICE /dev/cdrom$COUNT
 #! ((COUNT)) && create-symlink /dev/cdrom /dev/cdaudio
 ((COUNT++))
 isburner $DEVICE && { create-symlink /dev/$DEVICE /dev/cdburner$BURN_COUNT ; ((BURN_COUNT++)) ; }
 isdvd $DEVICE && { create-symlink /dev/$DEVICE /dev/dvd$DVD_COUNT ; ((DVD_COUNT++)) ; }
 isdvdburner $DEVICE && { create-symlink /dev/$DEVICE /dev/dvdburner$DVD_BURN_COUNT ; ((DVD_BURN_COUNT++)) ; }
done