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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='/usr/bin:/bin:/usr/sbin:/sbin'
+
+# 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 $1/.is-writeable
+ return 0
+ else
+ return 1
+ fi
+}
+
+# Create a lock file for the current rules file.
+lock_rules_file() {
+ RUNDIR=$(udevadm info --run)
+ [ -e "$RUNDIR" ] || return 0
+
+ RULES_LOCK="$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 $RULES_LOCK || true
+}
+
+# Choose the real rules file if it is writeable or a temporary file if not.
+# Both files should be checked later when looking for existing rules.
+choose_rules_file() {
+ RUNDIR=$(udevadm info --run)
+ local tmp_rules_file="$RUNDIR/tmp-rules--${RULES_FILE##*/}"
+ [ -e "$RULES_FILE" -o -e "$tmp_rules_file" ] || PRINT_HEADER=1
+
+ 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)
+}