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Diffstat (limited to 'extras/cdsymlinks.sh')
| -rw-r--r-- | extras/cdsymlinks.sh | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/extras/cdsymlinks.sh b/extras/cdsymlinks.sh new file mode 100644 index 0000000000..e99be2e544 --- /dev/null +++ b/extras/cdsymlinks.sh @@ -0,0 +1,184 @@ +#! /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 |