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-rw-r--r--rule_generator/rule_generator.functions120
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-# functions used by the udev rule generator
-
-# Copyright (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/>.
-
-PATH='/sbin:/bin'
-#
-
-PATH='/sbin:/bin'
-
-# Read a single line from file $1 in the $DEVPATH directory.
-# The function must not return an error even if the file does not exist.
-sysread() {
- local file="$1"
- [ -e "/sys$DEVPATH/$file" ] || return 0
- local value
- read value < "/sys$DEVPATH/$file" || return 0
- echo "$value"
-}
-
-sysreadlink() {
- local file="$1"
- [ -e "/sys$DEVPATH/$file" ] || return 0
- readlink -f /sys$DEVPATH/$file 2> /dev/null || true
-}
-
-# Return true if a directory is writeable.
-writeable() {
- if ln -s test-link $1/.is-writeable 2> /dev/null; then
- rm -f $1/.is-writeable
- return 0
- else
- return 1
- fi
-}
-
-# Create a lock file for the current rules file.
-lock_rules_file() {
- RUNDIR="/run/udev/"
-
- RULES_LOCK="$RUNDIR/.lock-${RULES_FILE##*/}"
-
- retry=30
- while ! mkdir $RULES_LOCK 2> /dev/null; do
- if [ $retry -eq 0 ]; then
- echo "Cannot lock $RULES_FILE!" >&2
- exit 2
- fi
- sleep 1
- retry=$(($retry - 1))
- done
-}
-
-unlock_rules_file() {
- [ "$RULES_LOCK" ] || return 0
- rmdir $RULES_LOCK || true
-}
-
-# Choose the real rules file if it is writeable or a temporary file if not.
-# Both files should be checked later when looking for existing rules.
-choose_rules_file() {
- RUNDIR="/run/udev/"
-
- local tmp_rules_file="$RUNDIR/tmp-rules--${RULES_FILE##*/}"
- [ -e "$RULES_FILE" -o -e "$tmp_rules_file" ] || PRINT_HEADER=1
-
- [ -d "${RULES_FILE%/*}" ] || if writeable ${RULES_FILE%/rules.d/*}; then
- mkdir -p "${RULES_FILE%/*}"
- fi
-
- if writeable ${RULES_FILE%/*}; then
- RO_RULES_FILE='/dev/null'
- else
- RO_RULES_FILE=$RULES_FILE
- RULES_FILE=$tmp_rules_file
- fi
-}
-
-# Return the name of the first free device.
-raw_find_next_available() {
- local links="$1"
-
- local basename=${links%%[ 0-9]*}
- local max=-1
- for name in $links; do
- local num=${name#$basename}
- [ "$num" ] || num=0
- [ $num -gt $max ] && max=$num
- done
-
- local max=$(($max + 1))
- # "name0" actually is just "name"
- [ $max -eq 0 ] && return
- echo "$max"
-}
-
-# Find all rules matching a key (with action) and a pattern.
-find_all_rules() {
- local key="$1"
- local linkre="$2"
- local match="$3"
-
- local search='.*[[:space:],]'"$key"'"('"$linkre"')".*'
- echo $(sed -n -r -e 's/^#.*//' -e "${match}s/${search}/\1/p" \
- $RO_RULES_FILE \
- $([ -e $RULES_FILE ] && echo $RULES_FILE) \
- 2>/dev/null)
-}