1 | # functions used by the udev rule generator
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2 |
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3 | # Copyright (C) 2006 Marco d'Itri <md@Linux.IT>
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4 | # Updated for LFS by Bruce Dubbs <bdubbs@linuxfromscratch.org>
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5 | # Hardcoded RUNDIR
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6 |
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7 | # This program is free software: you can redistribute it and/or modify
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8 | # it under the terms of the GNU General Public License as published by
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9 | # the Free Software Foundation, either version 2 of the License, or
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10 | # (at your option) any later version.
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11 |
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12 | # This program is distributed in the hope that it will be useful,
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13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | # GNU General Public License for more details.
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16 |
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17 | # You should have received a copy of the GNU General Public License
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18 | # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 |
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20 | PATH='/usr/bin:/bin:/usr/sbin:/sbin'
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21 |
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22 | # Read a single line from file $1 in the $DEVPATH directory.
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23 | # The function must not return an error even if the file does not exist.
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24 | sysread() {
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25 | local file="$1"
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26 | [ -e "/sys$DEVPATH/$file" ] || return 0
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27 | local value
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28 | read value < "/sys$DEVPATH/$file" || return 0
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29 | echo "$value"
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30 | }
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31 |
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32 | sysreadlink() {
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33 | local file="$1"
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34 | [ -e "/sys$DEVPATH/$file" ] || return 0
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35 | readlink -f /sys$DEVPATH/$file 2> /dev/null || true
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36 | }
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37 |
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38 | # Return true if a directory is writeable.
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39 | writeable() {
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40 | if ln -s test-link $1/.is-writeable 2> /dev/null; then
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41 | rm -f $1/.is-writeable
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42 | return 0
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43 | else
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44 | return 1
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45 | fi
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46 | }
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47 |
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48 | # Create a lock file for the current rules file.
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49 | lock_rules_file() {
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50 | RUNDIR=/run/udev
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51 | [ -e "$RUNDIR" ] || return 0
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52 |
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53 | RULES_LOCK="$RUNDIR/.lock-${RULES_FILE##*/}"
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54 |
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55 | retry=30
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56 | while ! mkdir $RULES_LOCK 2> /dev/null; do
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57 | if [ $retry -eq 0 ]; then
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58 | echo "Cannot lock $RULES_FILE!" >&2
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59 | exit 2
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60 | fi
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61 | sleep 1
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62 | retry=$(($retry - 1))
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63 | done
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64 | }
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65 |
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66 | unlock_rules_file() {
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67 | [ "$RULES_LOCK" ] || return 0
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68 | rmdir $RULES_LOCK || true
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69 | }
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70 |
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71 | # Choose the real rules file if it is writeable or a temporary file if not.
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72 | # Both files should be checked later when looking for existing rules.
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73 | choose_rules_file() {
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74 | RUNDIR=/run/udev
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75 | local tmp_rules_file="$RUNDIR/tmp-rules--${RULES_FILE##*/}"
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76 | [ -e "$RULES_FILE" -o -e "$tmp_rules_file" ] || PRINT_HEADER=1
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77 |
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78 | if writeable ${RULES_FILE%/*}; then
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79 | RO_RULES_FILE='/dev/null'
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80 | else
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81 | RO_RULES_FILE=$RULES_FILE
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82 | RULES_FILE=$tmp_rules_file
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83 | fi
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84 | }
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85 |
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86 | # Return the name of the first free device.
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87 | raw_find_next_available() {
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88 | local links="$1"
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89 |
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90 | local basename=${links%%[ 0-9]*}
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91 | local max=-1
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92 | for name in $links; do
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93 | local num=${name#$basename}
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94 | [ "$num" ] || num=0
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95 | [ $num -gt $max ] && max=$num
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96 | done
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97 |
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98 | local max=$(($max + 1))
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99 | # "name0" actually is just "name"
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100 | [ $max -eq 0 ] && return
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101 | echo "$max"
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102 | }
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103 |
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104 | # Find all rules matching a key (with action) and a pattern.
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105 | find_all_rules() {
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106 | local key="$1"
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107 | local linkre="$2"
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108 | local match="$3"
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109 |
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110 | local search='.*[[:space:],]'"$key"'"('"$linkre"')".*'
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111 | echo $(sed -n -r -e 's/^#.*//' -e "${match}s/${search}/\1/p" \
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112 | $RO_RULES_FILE \
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113 | $([ -e $RULES_FILE ] && echo $RULES_FILE) \
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114 | 2>/dev/null)
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115 | }
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