1 | #!/bin/sh -e
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2 |
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3 | # This script is run if an optical drive lacks a rule for persistent naming.
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4 | #
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5 | # It adds symlinks for optical drives based on the device class determined
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6 | # by cdrom_id and used ID_PATH to identify the device.
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7 |
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8 | # (C) 2006 Marco d'Itri <md@Linux.IT>
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9 | #
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10 | # This program is free software: you can redistribute it and/or modify
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11 | # it under the terms of the GNU General Public License as published by
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12 | # the Free Software Foundation, either version 2 of the License, or
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13 | # (at your option) any later version.
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14 |
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15 | # This program is distributed in the hope that it will be useful,
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16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | # GNU General Public License for more details.
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19 |
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20 | # You should have received a copy of the GNU General Public License
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21 | # along with this program. If not, see <http://www.gnu.org/licenses/>.
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22 |
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23 | # debug, if UDEV_LOG=<debug>
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24 | if [ -n "$UDEV_LOG" ]; then
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25 | if [ "$UDEV_LOG" -ge 7 ]; then
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26 | set -x
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27 | fi
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28 | fi
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29 |
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30 | RULES_FILE="/etc/udev/rules.d/70-persistent-cd.rules"
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31 |
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32 | . /lib/udev/rule_generator.functions
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33 |
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34 | find_next_available() {
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35 | raw_find_next_available "$(find_all_rules 'SYMLINK\+=' "$1")"
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36 | }
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37 |
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38 | write_rule() {
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39 | local match="$1"
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40 | local link="$2"
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41 | local comment="$3"
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42 |
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43 | {
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44 | if [ "$PRINT_HEADER" ]; then
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45 | PRINT_HEADER=
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46 | echo "# This file was automatically generated by the $0"
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47 | echo "# program, run by the cd-aliases-generator.rules rules file."
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48 | echo "#"
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49 | echo "# You can modify it, as long as you keep each rule on a single"
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50 | echo "# line, and set the \$GENERATED variable."
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51 | echo ""
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52 | fi
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53 |
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54 | [ "$comment" ] && echo "# $comment"
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55 | echo "$match, SYMLINK+=\"$link\", ENV{GENERATED}=\"1\""
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56 | } >> $RULES_FILE
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57 | SYMLINKS="$SYMLINKS $link"
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58 | }
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59 |
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60 | if [ -z "$DEVPATH" ]; then
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61 | echo "Missing \$DEVPATH." >&2
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62 | exit 1
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63 | fi
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64 | if [ -z "$ID_CDROM" ]; then
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65 | echo "$DEVPATH is not a CD reader." >&2
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66 | exit 1
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67 | fi
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68 |
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69 | if [ "$1" ]; then
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70 | METHOD="$1"
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71 | else
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72 | METHOD='by-path'
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73 | fi
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74 |
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75 | case "$METHOD" in
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76 | by-path)
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77 | if [ -z "$ID_PATH" ]; then
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78 | echo "$DEVPATH not supported by path_id. by-id may work." >&2
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79 | exit 1
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80 | fi
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81 | RULE="ENV{ID_PATH}==\"$ID_PATH\""
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82 | ;;
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83 |
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84 | by-id)
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85 | if [ "$ID_SERIAL" ]; then
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86 | RULE="ENV{ID_SERIAL}==\"$ID_SERIAL\""
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87 | elif [ "$ID_MODEL" -a "$ID_REVISION" ]; then
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88 | RULE="ENV{ID_MODEL}==\"$ID_MODEL\", ENV{ID_REVISION}==\"$ID_REVISION\""
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89 | else
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90 | echo "$DEVPATH not supported by ata_id. by-path may work." >&2
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91 | exit 1
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92 | fi
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93 | ;;
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94 |
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95 | *)
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96 | echo "Invalid argument (must be either by-path or by-id)." >&2
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97 | exit 1
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98 | ;;
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99 | esac
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100 |
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101 | # Prevent concurrent processes from modifying the file at the same time.
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102 | lock_rules_file
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103 |
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104 | # Check if the rules file is writeable.
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105 | choose_rules_file
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106 |
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107 | link_num=$(find_next_available 'cdrom[0-9]*')
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108 |
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109 | match="SUBSYSTEM==\"block\", ENV{ID_CDROM}==\"?*\", $RULE"
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110 |
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111 | comment="$ID_MODEL ($ID_PATH)"
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112 |
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113 | write_rule "$match" "cdrom$link_num" "$comment"
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114 | [ "$ID_CDROM_CD_R" -o "$ID_CDROM_CD_RW" ] && \
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115 | write_rule "$match" "cdrw$link_num"
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116 | [ "$ID_CDROM_DVD" ] && \
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117 | write_rule "$match" "dvd$link_num"
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118 | [ "$ID_CDROM_DVD_R" -o "$ID_CDROM_DVD_RW" -o "$ID_CDROM_DVD_RAM" ] && \
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119 | write_rule "$match" "dvdrw$link_num"
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120 | echo >> $RULES_FILE
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121 |
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122 | unlock_rules_file
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123 |
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124 | echo $SYMLINKS
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125 |
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126 | exit 0
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