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