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#! /bin/sh -e
#
# Map cdrom, cdm, cdmrw, cd-r, cdrw, dvd, dvdrw, dvdram to suitable devices.
# Prefers cd* for DVD-incapable and cdrom and dvd for read-only devices.
# First parameter is the kernel device name.
# Second parameter, if present, must be "-d" => output the full mapping.
#
# Usage:
# BUS="ide", KERNEL="hd[a-z]", PROGRAM="/etc/udev/cdsymlinks.sh %k", SYMLINK="%c{1} %c{2} %c{3} %c{4} %c{5} %c{6}"
# BUS="scsi", KERNEL="sr[0-9]*", PROGRAM="/etc/udev/cdsymlinks.sh %k", SYMLINK="%c{1} %c{2} %c{3} %c{4} %c{5} %c{6}"
# BUS="scsi", KERNEL="scd[0-9]*", PROGRAM="/etc/udev/cdsymlinks.sh %k", SYMLINK="%c{1} %c{2} %c{3} %c{4} %c{5} %c{6}"
# (this last one is "just in case")
#
# (c) 2004 Darren Salt <linux@youmustbejoking.demon.co.uk>
test -e /proc/sys/dev/cdrom/info || exit 0
# Defaults; it's better that you alter them in /etc/udev/cdsymlinks.conf
OUTPUT='CD CDRW DVD DVDRW DVDRAM'
NUMBERED_LINKS=1
test -e /etc/udev/cdsymlinks.conf && . /etc/udev/cdsymlinks.conf
DEBUG=''
test "$2" = '-d' && DEBUG=1
# Array emulation. 'setArray FOO a b c' gives FOO=3 FOO_1=a FOO_2=b FOO_3=c
setArray () {
local _ARRAY=$1
local _INDEX=0
shift
while test $# -ne 0; do
eval ${_ARRAY}_$_INDEX="$1"
_INDEX=$(($_INDEX+1))
shift
done
eval $_ARRAY=$_INDEX
}
ix () { eval echo -n \$$1_$2; }
ixs () { eval $1_$2="$3"; }
# Args: variable, value
# Returns true if value is not in variable (a whitespace-separated list)
notin () {
test "$2" = '' && return 0
local i
for i in `eval echo '$'$1`; do
test "$i" != "$2" || return 1
done
}
# Scan /proc/sys/dev/cdrom/info for details on the present devices
setArray DEVICES `sed -re '/^drive name:/I! d; s/.*://' /proc/sys/dev/cdrom/info`
setArray DVDRAMs `sed -re '/^Can write DVD-RAM:/I! d; s/.*://' /proc/sys/dev/cdrom/info`
setArray DVDRWs `sed -re '/^Can write DVD-R:/I! d; s/.*://' /proc/sys/dev/cdrom/info`
setArray DVDs `sed -re '/^Can read DVD:/I! d; s/.*://' /proc/sys/dev/cdrom/info`
setArray CDRWs `sed -re '/^Can write CD-RW:/I! d; s/.*://' /proc/sys/dev/cdrom/info`
setArray CDRs `sed -re '/^Can write CD-R:/I! d; s/.*://' /proc/sys/dev/cdrom/info`
setArray CDMRWs `sed -re '/^Can write MRW:/I! d; s/.*://' /proc/sys/dev/cdrom/info`
setArray CDMs `sed -re '/^Can read MRW:/I! d; s/.*://' /proc/sys/dev/cdrom/info`
# How many devices do we have?
NumDevs=$(($DEVICES-1))
Count=''
i=-1
while test $i -ne $NumDevs; do
i=$(($i+1));
Count="$i${Count:+ }$Count";
done
# Fill in any missing capabilities information (assume not capable)
for i in $Count; do
test "`ix DVDRAMs $i`" != '' || ixs DVDRAMs $i 0
test "`ix DVDRWs $i`" != '' || ixs DVDRWs $i 0
test "`ix DVDs $i`" != '' || ixs DVDs $i 0
test "`ix CDRWs $i`" != '' || ixs CDRWs $i 0
test "`ix CDRs $i`" != '' || ixs CDRs $i 0
test "`ix CDMRWs $i`" != '' || ixs CDMRWs $i 0
test "`ix CDMs $i`" != '' || ixs CDMs $i 0
done
DVDRAM=''
DVDRW=''
DVD=''
CDRW=''
CDR=''
CDMRW=''
CDM=''
CD=''
# Calculate symlink->device mappings.
# We need to be careful about how we assign mappings because we want
# read-only devices to have /dev/cdrom and /dev/dvd.
# Hot-plugged CD/DVD devices may well cause this scheme some problems.
for i in $Count; do
test "`ix DVDRAMs $i`" = 1 && DVDRAM="$DVDRAM `ix DEVICES $i`"
done
for i in $Count; do
test "`ix DVDRWs $i`" = 1 && DVDRW="$DVDRW `ix DEVICES $i`"
done
for i in $Count; do
test "`ix DVDs $i`" = 1 && DVD="$DVD `ix DEVICES $i`"
done
for i in $Count; do
test "`ix CDRWs $i`" = 1 && CDRW="$CDRW `ix DEVICES $i`"
done
for i in $Count; do
test "`ix CDRs $i`" = 1 && CDR="$CDR `ix DEVICES $i`"
done
for i in $Count; do
test "`ix CDMRWs $i`" = 1 && CDMRW="$CDMRW `ix DEVICES $i`"
done
for i in $Count; do
test "`ix CDMs $i`" = 1 && CDM="$CDM `ix DEVICES $i`"
done
for i in $Count; do
CD="$CD `ix DEVICES $i`"
done
# Debug output
if test "$DEBUG" = 1; then
echo 'Devices:' `for i in $Count; do ix DEVICES $i; echo -n \ ; done`
echo 'DVDRAM :' `for i in $Count; do ix DVDRAMs $i; echo -n \ ; done` $DVDRAM
echo 'DVDRW :' `for i in $Count; do ix DVDRWs $i; echo -n \ ; done` $DVDRW
echo 'DVD :' `for i in $Count; do ix DVDs $i; echo -n \ ; done` $DVD
echo 'CDRW :' `for i in $Count; do ix CDRWs $i; echo -n \ ; done` $CDRW
echo 'CD-R :' `for i in $Count; do ix CDRs $i; echo -n \ ; done` $CDR
echo 'CDMRW :' `for i in $Count; do ix CDMRWs $i; echo -n \ ; done` $CDMRW
echo 'CDM :' `for i in $Count; do ix CDMs $i; echo -n \ ; done` $CDM
echo 'CDROM : (all)' $CD
fi
# Prepare symlink names output
output () {
test "`eval echo '$'$3`" = '' && return
local i
local COUNT=''
local DEVLS="`ls -dl \"/dev/$2\" \"/dev/$2\"[0-9]* 2>/dev/null`"
local PRESENT="`echo "$DEVLS" |
sed -re 's!^.* /dev/('$2'[[:digit:]]*) -> [^[:space:]]+$!\1!'`"
for i in `eval echo '$'$3`; do
# First, we look for existing symlinks to the target device.
local DEVPRESENT="`echo "$DEVLS" |
sed -re 's!^.* /dev/('$2'[[:digit:]]*) -> '$i'$!\1!; t X; d; :X'`"
if test "$DEVPRESENT" != ""; then
# Existing symlinks found - don't output a new one.
# If the target dev ($1) is the current dev ($i), we output their names.
test "$1" = "$i" && echo " $DEVPRESENT" | sed -e 'N; $ s/\n/ /'
else
# If we found no existing symlinks for the target device...
# Find the next available (not present) symlink name.
# We always need to do this for reasons of output consistency: if a
# symlink is created by udev as a result of use of this program, we
# DON'T want different output!
until notin PRESENT "$2$COUNT"; do
COUNT=$(($COUNT+1))
done
# If the target dev ($1) is the current dev ($i), we output its name.
if test $(($NUMBERED_LINKS)) -ne 0 || test "$COUNT" -eq 0; then
test "$i" = "$1" && echo -n " $2$COUNT"
fi
# If the link isn't in our "existing links" list, add it and increment
# our counter.
if test ! -e "/dev/$2$COUNT"; then
PRESENT="$PRESENT\n$2$COUNT"
COUNT=$(($COUNT+1))
fi
fi
done
}
# And output it
notin OUTPUT CD || echo -n "`output "$1" cdrom CD`"
notin OUTPUT CDMRW || echo -n "`output "$1" cdmrw CDM`"
notin OUTPUT CDWMRW || echo -n "`output "$1" cdwmrw CDMRW`"
notin OUTPUT CDR || echo -n "`output "$1" cd-r CDR`"
notin OUTPUT CDRW || echo -n "`output "$1" cdrw CDRW`"
notin OUTPUT DVD || echo -n "`output "$1" dvd DVD`"
notin OUTPUT DVDRW || echo -n "`output "$1" dvdrw DVDRW`"
notin OUTPUT DVDRAM || echo -n "`output "$1" dvdram DVDRAM`"
echo
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