mirror of
https://github.com/Poltern/lfs-ru.git
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121 lines
2.8 KiB
Bash
121 lines
2.8 KiB
Bash
#!/bin/sh -e
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# Updated for LFS by B. Dubbs, 2012-09-23
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# Fix RULES_LOCK location
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RULES_FILE="/etc/udev/rules.d/82-persistent-cd.rules"
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##############################################################################
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lock_rules_file() {
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RULES_LOCK="/run/udev/lock-${RULES_FILE##*/}"
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if [ ! -d /run/udev/ ]; then
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echo "write_cd_aliases: /run/udev does not exist!" >&2
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exit 2
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fi
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retry=10
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while ! mkdir $RULES_LOCK 2> /dev/null; do
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if [ $retry -eq 0 ]; then
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echo "Cannot lock $RULES_FILE!" >&2
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exit 2
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fi
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sleep 1
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retry=$(($retry - 1))
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done
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}
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unlock_rules_file() {
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rmdir $RULES_LOCK || true
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}
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##############################################################################
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find_next_available() {
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# use echo to convert newlines to spaces
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local links=`echo $(find_all_symlinks $1)`
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local basename=${links%%[ 0-9]*}
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local max=-1
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for name in $links; do
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local num=${name#$basename}
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[ "$num" ] || num=0
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[ $num -gt $max ] && max=$num
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done
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max=$(($max + 1))
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# "name0" actually is just "name"
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[ $max -eq 0 ] && return
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echo "$max"
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}
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find_all_symlinks() {
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local linkre="$1"
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local match="$2"
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[ -e $RULES_FILE ] || return
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local search='.*[[:space:],]SYMLINK+="\('"$linkre"'\)"[[:space:]]*\(,.*\|\\\|\)$'
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sed -n -e "${match}s/${search}/\1/p" $RULES_FILE
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}
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write_rule() {
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local match="$1"
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local link="$2"
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local comment="$3"
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[ -e "$RULES_FILE" ] || PRINT_HEADER=1
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{
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if [ "$PRINT_HEADER" ]; then
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PRINT_HEADER=
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echo "# This file was automatically generated by the $0"
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echo "# program, probably run by the 83-cdrom.rules rules file."
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echo "#"
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echo "# You can modify it, as long as you keep each rule on a single line"
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echo "# and set the \$GENERATED variable."
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echo ""
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fi
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[ "$comment" ] && echo "# $comment"
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echo "ACTION==\"add\", SUBSYSTEM==\"block\", $match, ENV{ID_CDROM}==\"1\", SYMLINK+=\"$link\", ENV{GENERATED}=\"1\""
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} >> $RULES_FILE
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SYMLINKS="$SYMLINKS $link"
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}
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##############################################################################
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if [ -z "$DEVPATH" ]; then
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echo "Missing \$DEVPATH." >&2
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exit 1
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fi
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if [ -z "$ID_CDROM" ]; then
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echo "$DEVPATH is not a CD reader." >&2
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exit 1
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fi
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# Prevent parallel processes from modifying the file at the same time.
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lock_rules_file
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link_num=$(find_next_available 'cdrom[0-9]*')
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#match="ENV{ID_PATH}==\"$ID_PATH\""
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#kernel=${DEVPATH##*/}
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#match="KERNEL==\"$kernel\""
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id=${PHYSDEVPATH##*/}
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match="BUS==\"$PHYSDEVBUS\", ID==\"$id\""
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comment="$ID_MODEL ($ID_PATH)"
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write_rule "$match" "cdrom$link_num" "$comment"
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[ "$ID_CDROM_CD_RW" ] && write_rule "$match" "cdrw$link_num"
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[ "$ID_CDROM_DVD" ] && write_rule "$match" "dvd$link_num"
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[ "$ID_CDROM_DVD_RW" ] && write_rule "$match" "dvdrw$link_num"
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unlock_rules_file
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echo $SYMLINKS
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exit 0
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