diff options
Diffstat (limited to 'udev/contrib/debian/write_cd_aliases')
-rw-r--r-- | udev/contrib/debian/write_cd_aliases | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/udev/contrib/debian/write_cd_aliases b/udev/contrib/debian/write_cd_aliases new file mode 100644 index 0000000..ea8eeb7 --- /dev/null +++ b/udev/contrib/debian/write_cd_aliases @@ -0,0 +1,120 @@ +#!/bin/sh -e + +# Updated for LFS by B. Dubbs, 2012-09-23 +# Fix RULES_LOCK location + + +RULES_FILE="/etc/udev/rules.d/82-persistent-cd.rules" + +############################################################################## +lock_rules_file() { + RULES_LOCK="/run/udev/lock-${RULES_FILE##*/}" + + if [ ! -d /run/udev/ ]; then + echo "write_cd_aliases: /run/udev does not exist!" >&2 + exit 2 + fi + + retry=10 + 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 + |