1 # functions used by the udev rule generator
3 # Copyright (C) 2006 Marco d'Itri <md@Linux.IT>
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation, either version 2 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 PATH='/usr/bin:/bin:/usr/sbin:/sbin'
20 # Read a single line from file $1 in the $DEVPATH directory.
21 # The function must not return an error even if the file does not exist.
24 [ -e "/sys$DEVPATH/$file" ] || return 0
26 read value < "/sys$DEVPATH/$file" || return 0
32 [ -e "/sys$DEVPATH/$file" ] || return 0
33 readlink -f /sys$DEVPATH/$file 2> /dev/null || true
36 # Return true if a directory is writeable.
38 if ln -s test-link $1/.is-writeable 2> /dev/null; then
39 rm -f $1/.is-writeable
46 # Create a lock file for the current rules file.
48 RUNDIR=$(udevadm info --run)
49 [ -e "$RUNDIR" ] || return 0
51 RULES_LOCK="$RUNDIR/.lock-${RULES_FILE##*/}"
54 while ! mkdir $RULES_LOCK 2> /dev/null; do
55 if [ $retry -eq 0 ]; then
56 echo "Cannot lock $RULES_FILE!" >&2
65 [ "$RULES_LOCK" ] || return 0
66 rmdir $RULES_LOCK || true
69 # Choose the real rules file if it is writeable or a temporary file if not.
70 # Both files should be checked later when looking for existing rules.
72 RUNDIR=$(udevadm info --run)
73 local tmp_rules_file="$RUNDIR/tmp-rules--${RULES_FILE##*/}"
74 [ -e "$RULES_FILE" -o -e "$tmp_rules_file" ] || PRINT_HEADER=1
76 if writeable ${RULES_FILE%/*}; then
77 RO_RULES_FILE='/dev/null'
79 RO_RULES_FILE=$RULES_FILE
80 RULES_FILE=$tmp_rules_file
84 # Return the name of the first free device.
85 raw_find_next_available() {
88 local basename=${links%%[ 0-9]*}
90 for name in $links; do
91 local num=${name#$basename}
93 [ $num -gt $max ] && max=$num
96 local max=$(($max + 1))
97 # "name0" actually is just "name"
98 [ $max -eq 0 ] && return
102 # Find all rules matching a key (with action) and a pattern.
108 local search='.*[[:space:],]'"$key"'"('"$linkre"')".*'
109 echo $(sed -n -r -e 's/^#.*//' -e "${match}s/${search}/\1/p" \
111 $([ -e $RULES_FILE ] && echo $RULES_FILE) \