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