1 files changed, 126 insertions, 0 deletions
diff --git a/udev/write_cd_rules b/udev/write_cd_rules
new file mode 100755
index 0000000..645b9cd
--- /dev/null
+++ b/udev/write_cd_rules
@@ -0,0 +1,126 @@
+#!/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