Re: CD Symlinks Solution Idea

[Jim Gifford <maillist@jg555.com>]

After some feedback received from this list and my peers, a small issue 
now has been fixed. Thank you all for your ideas.

The solution will be persistent on the IDE side, but not sure on the 
SCSI side of the house.

Here is the complete solution.

Udev Rules
BUS="ide",     KERNEL="hd[a-z]", ACTION="add", IMPORT="cdrom_id 
--export $tempnode"
BUS="scsi",    KERNEL="sr[0-9]*", ACTION="add", IMPORT="cdrom_id 
--export $tempnode"
BUS="scsi",    KERNEL="scd[a-z]", ACTION="add", IMPORT="cdrom_id 
--export $tempnode"
BUS="scsi",    KERNEL="sg[0-9]*", ACTION="add", DRIVER="sr", 
GROUP="cdrom"

BUS="ide", ENV{ID_CDROM}="?*",        PROGRAM="cdsymlink_helper.sh %k 
ide", SYMLINK+="cdrom%c"
BUS="ide", ENV{ID_CDROM_CD_R}="?*",   PROGRAM="cdsymlink_helper.sh %k 
ide", SYMLINK+="cdr%c"
BUS="ide", ENV{ID_CDROM_CD_RW}="?*",  PROGRAM="cdsymlink_helper.sh %k 
ide", SYMLINK+="cdrw%c"
BUS="ide", ENV{ID_CDROM_DVD}="?*",    PROGRAM="cdsymlink_helper.sh %k 
ide", SYMLINK+="dvd%c"
BUS="ide", ENV{ID_CDROM_DVD_R}="?*",  PROGRAM="cdsymlink_helper.sh %k 
ide", SYMLINK+="dvdrw%c"

BUS="scsi", ENV{ID_CDROM}="?*",       PROGRAM="cdsymlink_helper.sh %n 
scsi", SYMLINK+="cdrom%c"
BUS="scsi", ENV{ID_CDROM_CD_R}="?*",  PROGRAM="cdsymlink_helper.sh %n 
scsi", SYMLINK+="cdr%c"
BUS="scsi", ENV{ID_CDROM_CD_RW}="?*", PROGRAM="cdsymlink_helper.sh %n 
scsi", SYMLINK+="cdrw%c"
BUS="scsi", ENV{ID_CDROM_DVD}="?*",   PROGRAM="cdsymlink_helper.sh %n 
scsi", SYMLINK+="dvd%c"
BUS="scsi", ENV{ID_CDROM_DVD_R}="?*", PROGRAM="cdsymlink_helper.sh %n 
scsi", SYMLINK+="dvdrw%c"

cdsymlink_helper.sh

#!/bin/sh
KERN_NAME="$1"
BUS="$2"
test=0

if [ "$KERN_NAME" = "" ]; then
        mesg Bad invocation: \$1 is not set
        exit 1
fi

if [ "$BUS" = "ide" ]; then
        FILES="`ls /sys/bus/ide/drivers/ide-cdrom | grep '\.' `"
                for file in $FILES; do
                        TEST="`ls /sys/bus/ide/drivers/ide-cdrom/$file | 
grep -c $KERN_NAME`"
                        if [ "$TEST" = "1" ]; then
                                link="`echo $file | cut -f2 -d.`"
                                while [ $test -lt 1 ] ; do
                                        if [ -e /dev/cdrom$link ]; then
                                                link=$[$link+1]
                                        else
                                                test=1
                                                echo $link
                                        fi
                                done
                        fi
                done
fi

if [ "$BUS" = "SCSI" ]; then
        link=$KERN_NAME
                while [ $test -lt 1 ] ; do
                        if [ -e /dev/cdrom$link ]; then
                                link=$[$link+1]
                        else
                                test=1
                                echo $link
                        fi
                done
fi



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