PATH='/sbin:/bin'

source /etc/eni_utils/eni-helper

# 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
}

#fix me
RUNDIR=/dev/.udev
if [ ! -d $RUNDIR ]; then
	mkdir -p $RUNDIR
fi

# Create a lock file for the current rules file.
lock_rules_file() {
	eni_log 'rule_generator.functions: enter lock_rules_file'
	#fix me
	#RUNDIR=$(udevadm info --run)
	eni_log "rule_generator.functions: RUNDIR: ${RULES_LOCK}"
	[ -e "$RUNDIR" ] || return 0

	RULES_LOCK="$RUNDIR/.lock-${RULES_FILE##*/}"
	eni_log "rule_generator.functions: run dir: RULES_LOCK: ${RULES_LOCK}"

	retry=30
	while ! mkdir $RULES_LOCK 2> /dev/null; do
		eni_log "rule_generator.functions: enter lock rules file while loop 3333 trying to mkdir $RULES_LOCK"
		if [ $retry -eq 0 ]; then
			 echo "Cannot lock $RULES_FILE!" >&2
			 exit 2
		fi
		sleep 1
		retry=$(($retry - 1))
	done
    eni_log 'rule_generator.functions: enter lock rules file 4444'
}

unlock_rules_file() {
	eni_log 'rule_generator.functions: enter 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() {
	#fix me
	#RUNDIR=$(udevadm info --run)
	local tmp_rules_file="$RUNDIR/tmp-rules--${RULES_FILE##*/}"

	eni_log "rule_generator.functions: tmp_rules_file is: ${tmp_rules_file}"
	eni_log "rule_generator.functions: RULES_FILE is: ${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)
}