[PATCH] add very nice cdsymlinks scripts.

These are from Darren Salt <linux@youmustbejoking.demon.co.uk>

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