rule_generator.functions revision 4ec9c3e79771aa95586390cecff4218cc8938160
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# functions used by the udev rule generator
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# Copyright (C) 2006 Marco d'Itri <md@Linux.IT>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# This program is free software: you can redistribute it and/or modify
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# it under the terms of the GNU General Public License as published by
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# the Free Software Foundation, either version 2 of the License, or
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# (at your option) any later version.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# This program is distributed in the hope that it will be useful,
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# but WITHOUT ANY WARRANTY; without even the implied warranty of
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# GNU General Public License for more details.
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk# You should have received a copy of the GNU General Public License
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk# along with this program. If not, see <http://www.gnu.org/licenses/>.
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenkPATH='/sbin:/bin'
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkPATH='/sbin:/bin'
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# Read a single line from file $1 in the $DEVPATH directory.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# The function must not return an error even if the file does not exist.
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk local file="$1"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk [ -e "/sys$DEVPATH/$file" ] || return 0
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk read value < "/sys$DEVPATH/$file" || return 0
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk echo "$value"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenksysreadlink() {
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk local file="$1"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk [ -e "/sys$DEVPATH/$file" ] || return 0
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk readlink -f /sys$DEVPATH/$file 2> /dev/null || true
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# Return true if a directory is writeable.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkwriteable() {
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk if ln -s test-link $1/.is-writeable 2> /dev/null; then
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk rm -f $1/.is-writeable
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# Create a lock file for the current rules file.
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenklock_rules_file() {
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk RUNDIR=$(udevadm info --run)
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk [ -e "$RUNDIR" ] || return 0
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk RULES_LOCK="$RUNDIR/.lock-${RULES_FILE##*/}"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk while ! mkdir $RULES_LOCK 2> /dev/null; do
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk if [ $retry -eq 0 ]; then
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk echo "Cannot lock $RULES_FILE!" >&2
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk retry=$(($retry - 1))
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkunlock_rules_file() {
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk [ "$RULES_LOCK" ] || return 0
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk rmdir $RULES_LOCK || true
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# Choose the real rules file if it is writeable or a temporary file if not.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk# Both files should be checked later when looking for existing rules.
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenkchoose_rules_file() {
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk RUNDIR=$(udevadm info --run)
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk local tmp_rules_file="$RUNDIR/tmp-rules--${RULES_FILE##*/}"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk [ -e "$RULES_FILE" -o -e "$tmp_rules_file" ] || PRINT_HEADER=1
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk if writeable ${RULES_FILE%/*}; then
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk RO_RULES_FILE='/dev/null'
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk RO_RULES_FILE=$RULES_FILE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk RULES_FILE=$tmp_rules_file
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk# Return the name of the first free device.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkraw_find_next_available() {
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk local links="$1"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk local basename=${links%%[ 0-9]*}
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk local max=-1
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk for name in $links; do
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk local num=${name#$basename}
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk [ "$num" ] || num=0
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk [ $num -gt $max ] && max=$num
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk local max=$(($max + 1))
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk # "name0" actually is just "name"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk [ $max -eq 0 ] && return
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk# Find all rules matching a key (with action) and a pattern.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkfind_all_rules() {
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk local key="$1"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk local linkre="$2"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk local match="$3"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk local search='.*[[:space:],]'"$key"'"('"$linkre"')".*'
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk echo $(sed -n -r -e 's/^#.*//' -e "${match}s/${search}/\1/p" \
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk $RO_RULES_FILE \
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk $([ -e $RULES_FILE ] && echo $RULES_FILE) \