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-rw-r--r--rule_generator/write_cd_rules.in127
1 files changed, 127 insertions, 0 deletions
diff --git a/rule_generator/write_cd_rules.in b/rule_generator/write_cd_rules.in
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+++ b/rule_generator/write_cd_rules.in
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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="@udevconfdir@/rules.d/70-persistent-cd.rules"
+
+. @udevlibexecdir@/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
+