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#!/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
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