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128 lines
3.1 KiB
Bash
128 lines
3.1 KiB
Bash
#!/bin/sh -e
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# This script is run if an optical drive lacks a rule for persistent naming.
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#
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# It adds symlinks for optical drives based on the device class determined
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# by cdrom_id and used ID_PATH to identify the device.
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# (C) 2006 Marco d'Itri <md@Linux.IT>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# debug, if UDEV_LOG=<debug>
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if [ -n "$UDEV_LOG" ]; then
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if [ "$UDEV_LOG" -ge 7 ]; then
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set -x
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fi
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fi
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RULES_FILE="/etc/udev/rules.d/70-persistent-cd.rules"
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. /lib/udev/rule_generator.functions
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find_next_available() {
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raw_find_next_available "$(find_all_rules 'SYMLINK\+=' "$1")"
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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="$3"
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{
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if [ "$PRINT_HEADER" ]; then
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PRINT_HEADER=
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echo "# This file was automatically generated by the $0"
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echo "# program, run by the cd-aliases-generator.rules rules file."
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echo "#"
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echo "# You can modify it, as long as you keep each rule on a single"
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echo "# line, and set the \$GENERATED variable."
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echo ""
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fi
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[ "$comment" ] && echo "# $comment"
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echo "$match, SYMLINK+=\"$link\", ENV{GENERATED}=\"1\""
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} >> $RULES_FILE
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SYMLINKS="$SYMLINKS $link"
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}
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if [ -z "$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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if [ "$1" ]; then
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METHOD="$1"
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else
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METHOD='by-path'
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fi
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case "$METHOD" in
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by-path)
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if [ -z "$ID_PATH" ]; then
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echo "$DEVPATH not supported by path_id. by-id may work." >&2
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exit 1
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fi
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RULE="ENV{ID_PATH}==\"$ID_PATH\""
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;;
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by-id)
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if [ "$ID_SERIAL" ]; then
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RULE="ENV{ID_SERIAL}==\"$ID_SERIAL\""
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elif [ "$ID_MODEL" -a "$ID_REVISION" ]; then
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RULE="ENV{ID_MODEL}==\"$ID_MODEL\", ENV{ID_REVISION}==\"$ID_REVISION\""
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else
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echo "$DEVPATH not supported by ata_id. by-path may work." >&2
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exit 1
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fi
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;;
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*)
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echo "Invalid argument (must be either by-path or by-id)." >&2
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exit 1
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;;
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esac
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# Prevent concurrent processes from modifying the file at the same time.
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lock_rules_file
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# Check if the rules file is writeable.
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choose_rules_file
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link_num=$(find_next_available 'cdrom[0-9]*')
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match="SUBSYSTEM==\"block\", ENV{ID_CDROM}==\"?*\", $RULE"
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comment="$ID_MODEL ($ID_PATH)"
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write_rule "$match" "cdrom$link_num" "$comment"
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[ "$ID_CDROM_CD_R" -o "$ID_CDROM_CD_RW" ] && \
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write_rule "$match" "cdrw$link_num"
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[ "$ID_CDROM_DVD" ] && \
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write_rule "$match" "dvd$link_num"
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[ "$ID_CDROM_DVD_R" -o "$ID_CDROM_DVD_RW" -o "$ID_CDROM_DVD_RAM" ] && \
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write_rule "$match" "dvdrw$link_num"
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echo >> $RULES_FILE
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unlock_rules_file
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echo $SYMLINKS
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exit 0
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