detection and use of multiple CD/DVDs

[Dale Einarson]

Allo,
   I was wondering if any one had come up with a better idea for 
distinguishing more then one IDE CDROM, DVD, DVDR, DVDR at a time then;
     Adding ide-scsi to boot switches
     Linking appropriate device names
     Adding mount points to autofs?


   If there is a better way( I am sure, or at least I hope) I would be 
greatful for some pointers.  Sorry for the long read, thanks for any help.



Disclaimers:
    I am new to linux so hardware detection utilities are not something 
I am greatly familiar with.  I realize this is prone to break(and 
messy), but it works :}

##############################################################
# Once completed a user with more than one cd/dvd burning device
#  * should have a link from scd to the apropriate name(cdr/dvdr etc)
#  * should have autofs handling the mounting
#  * should have grub (in this case) providing the ide-scsi argument
##############################################################


CDLOG=/tmp/cdrom.log

# +------------------------------------------------------
# | Define devs for DVD through CD
# |  -- Any line starting with hd containing a 'CD word'
# |    add to $CDLOG
# +------------------------------------------------------
DVDR=`dmesg | grep "DVD.RW"|cut -d: -f1|grep ^hd.|sort -u|tee $CDLOG`

CDR=` dmesg|grep "RW"|fgrep -v  -f $CDLOG|cut -d: -f1|grep ^hd.|sort 
-u|tee -a $CDLOG`

DVD=` dmesg|grep "DVD.ROM"|fgrep -v  -f $CDLOG|cut -d: -f1|grep 
^hd.|sort -u|tee -a $CDLOG`

CD=`  dmesg|grep "CD"|fgrep -v  -f $CDLOG|cut -d: -f1|grep ^hd.|sort 
-u|tee -a $CDLOG`

# +------------------------------------------------------
# | make organized list of 'writer' devs ( aka scd?)
# | - aiding the numbering scheme
# +------------------------------------------------------
SCD=`echo -e "$DVDR $CDR" |tr " " '\012' |sort -u`


# +------------------------------------------------------
# | initialize device numbers  for dvdr, cdr and scd
# +------------------------------------------------------
DNO=0
CNO=0
CDNO=0

CDOPTS="-fstype=iso9660,ro,sync,nodev,nosuid"


# +------------------------------------------------------
# |
# | link hd? to $NAME, add point to autofs
# |
# |  if NAME=writer add bootargs hd?=ide-scsi
# |     +-> if DVDR use dvdr, else use cdr
# +------------------------------------------------------
addpoint(){
    if [ "$NAME" == "writer"  ] ; then
       if ( echo $DVDR | grep -q $DEV ) ;then
          NAME=dvdr
	 NO=$DNO
	 DNO=`expr 1 + $DNO`
       else
	 NAME=cdr
	 NO=$CNO
	 CNO=`expr 1 + $CNO`
       fi
       export BOOTARGS=" $BOOTARGS $DEV=ide-scsi"

       ####  IF ide-scsi then scd should be used not $DEV
       DEV=scd
       ln -s /dev/$DEV$CDNO $target/dev/$NAME$NO
       echo $NAME$NO $CDOPS :/dev/scd$CDNO >> $target/etc/AutoFS/auto.mnt
       CDNO=`expr 1 + $CDNO`
     else
       ln -s /dev/$DEV $target/dev/$NAME$NO
       echo $NAME$NO $CDOPS :/dev/$DEV$NO >> $target/etc/AutoFS/auto.mnt
    fi
        NO=`expr 1 + $NO`
}
# +------------------------------------------------------




# +------------------------------------------------------
#  For each DEV call addpoint with NAME=`device type`
#  and increment the device number ( eg dvd0, dvd1 )
#     where "device type" is either writer, DVD or CD
# +------------------------------------------------------
for DEV in $SCD ;do
    NAME=writer
    addpoint
done

#   reset dev number
NO="0"
for DEV in $CD ;do
    NAME=cdrom
    addpoint
    NO=`expr 1 + $NO`
done

#   reset dev number
NO="0"
for DEV in $DVD ;do
    NAME=cdrom
    addpoint
    NO=`expr 1 + $NO`
done


# +------------------------------------------------------
# |  add $BOOTARGS to the kernel boot args
# +------------------------------------------------------
 >>>>SNIP<<<<
cat > $gmenu <<-EOF

	# created by FAI
	
	timeout 10
	default 0
	color cyan/blue white/blue

	title Debian GNU/Linux, $kernelversion $BOOTARGS
	root $broot
	kernel $gpath root=$ROOT_PARTITION $BOOTARGS
	$initrdopt
EOF

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





   'Zugemessen ward dem Lichte seine Zeit  ; aber zeitlos und
raumlos ist der Nacht Herrschaft.'


Cheers!
dale