1 files changed, 111 insertions, 0 deletions
diff --git a/udev-config/contrib/debian/write_cd_aliases b/udev-config/contrib/debian/write_cd_aliases
new file mode 100644
index 000000000..6443b6dcf
--- /dev/null
+++ b/udev-config/contrib/debian/write_cd_aliases
@@ -0,0 +1,111 @@
+#!/bin/sh -e
+
+RULES_FILE="/etc/udev/rules.d/82-persistent-cd.rules"
+
+##############################################################################
+lock_rules_file() {
+  RULES_LOCK="/dev/.udev/.lock-${RULES_FILE##*/}"
+
+  retry=30
+  while ! mkdir $RULES_LOCK 2> /dev/null; do
+    if [ $retry -eq 0 ]; then
+       echo "Cannot lock $RULES_FILE!" >&2
+       exit 2
+    fi
+    sleep 1
+    retry=$(($retry - 1))
+  done
+}
+
+unlock_rules_file() {
+  rmdir $RULES_LOCK || true
+}
+
+##############################################################################
+find_next_available() {
+  # use echo to convert newlines to spaces
+  local links=`echo $(find_all_symlinks $1)`
+  local basename=${links%%[ 0-9]*}
+  local max=-1
+  for name in $links; do
+    local num=${name#$basename}
+    [ "$num" ] || num=0
+    [ $num -gt $max ] && max=$num
+  done
+
+  max=$(($max + 1))
+  # "name0" actually is just "name"
+  [ $max -eq 0 ] && return
+  echo "$max"
+}
+
+find_all_symlinks() {
+  local linkre="$1"
+  local match="$2"
+
+  [ -e $RULES_FILE ] || return
+
+  local search='.*[[:space:],]SYMLINK+="\('"$linkre"'\)"[[:space:]]*\(,.*\|\\\|\)$'
+
+  sed -n -e "${match}s/${search}/\1/p" $RULES_FILE
+}
+
+write_rule() {
+  local match="$1"
+  local link="$2"
+  local comment="$3"
+
+  [ -e "$RULES_FILE" ] || PRINT_HEADER=1
+  {
+  if [ "$PRINT_HEADER" ]; then
+    PRINT_HEADER=
+    echo "# This file was automatically generated by the $0"
+    echo "# program, probably run by the 83-cdrom.rules rules file."
+    echo "#"
+    echo "# You can modify it, as long as you keep each rule on a single line"
+    echo "# and set the \$GENERATED variable."
+    echo ""
+  fi
+
+  [ "$comment" ] && echo "# $comment"
+  echo "ACTION==\"add\", SUBSYSTEM==\"block\", $match, ENV{ID_CDROM}==\"1\", SYMLINK+=\"$link\", ENV{GENERATED}=\"1\""
+  } >> $RULES_FILE
+  SYMLINKS="$SYMLINKS $link"
+}
+
+##############################################################################
+if [ -z "$DEVPATH" ]; then
+  echo "Missing \$DEVPATH." >&2
+  exit 1
+fi
+if [ -z "$ID_CDROM" ]; then
+  echo "$DEVPATH is not a CD reader." >&2
+  exit 1
+fi
+
+# Prevent parallel processes from modifying the file at the same time.
+lock_rules_file
+
+link_num=$(find_next_available 'cdrom[0-9]*')
+
+#match="ENV{ID_PATH}==\"$ID_PATH\""
+
+#kernel=${DEVPATH##*/}
+#match="KERNEL==\"$kernel\""
+
+id=${PHYSDEVPATH##*/}
+match="BUS==\"$PHYSDEVBUS\", ID==\"$id\""
+
+comment="$ID_MODEL ($ID_PATH)"
+
+			  write_rule "$match" "cdrom$link_num" "$comment"
+[ "$ID_CDROM_CD_RW" ]  && write_rule "$match" "cdrw$link_num"
+[ "$ID_CDROM_DVD" ]    && write_rule "$match" "dvd$link_num"
+[ "$ID_CDROM_DVD_RW" ] && write_rule "$match" "dvdrw$link_num"
+
+unlock_rules_file
+
+echo $SYMLINKS
+
+exit 0
+