Initial commit

README.md

@@ -1,2 +1,3 @@
 # bash-empty-daemon
 Template of empty daemon for Linux on pure bash
+

funcs.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+check_util() {
+	util_name="$1"
+	check=`whereis $util_name`
+	if [ "$check" = "" ]; then
+		echo "Error: '$util_name' is not found... Fix error and try again!"
+		exit
+	fi
+}
+
+get_util() {
+	util_name="$1"
+	IS_MAC_OS=`uname -a | grep Darwin`
+	if [ "$IS_MAC_OS" != "" ]; then
+		# Mac OS X
+		resp=`whereis $util_name | awk {'print $1'}`
+		eval "$2='$resp'"
+		return
+	else
+		# Linux
+		resp=`whereis $util_name | awk {'print $2'}`
+		eval "$2='$resp'"
+		return
+	fi
+	eval "$2=''"
+	return
+}
+
+is_pid_runned() {
+	resp=`ps aux | grep ".sh start" | grep $1`
+	if [ "$resp" != "" ]; then
+		eval "$2='1'"
+	else
+		eval "$2='0'"
+	fi
+	return
+}

loop.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# Main daemon body
+echo "Loop. Every one second. Do something here..."

run.sh

@@ -0,0 +1,136 @@
+#!/bin/sh
+
+SETT_DAEMON_MODE=1
+SETT_DAEMON_PATH="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
+SETT_DAEMON_FOLDER_LOGS="$SETT_DAEMON_PATH/logs"
+SETT_DAEMON_LOGS_WORK_FILE="$SETT_DAEMON_FOLDER_LOGS/all.log"
+SETT_DAEMON_PID_FILE="$SETT_DAEMON_PATH/pid"
+
+# Include funcs
+. "$SETT_DAEMON_PATH/funcs.sh"
+
+check_util "mkdir"
+check_util "chmod"
+check_util "touch"
+check_util "cat"
+check_util "kill"
+check_util "rm"
+
+get_util "mkdir" UTIL_MKDIR
+get_util "chmod" UTIL_CHMOD
+get_util "touch" UTIL_TOUCH
+get_util "cat" UTIL_CAT
+get_util "kill" UTIL_KILL
+get_util "rm" UTIL_RM
+
+check() {
+	if [ ! -d "$SETT_DAEMON_FOLDER_LOGS" ]; then
+		$UTIL_MKDIR "$SETT_DAEMON_FOLDER_LOGS"
+		$UTIL_CHMOD 0755 "$SETT_DAEMON_FOLDER_LOGS"
+	fi
+}
+
+log_str() {
+	process=$1
+	shift
+	log_date=$(date '+%F %T');
+	log_string="[$log_date] [$$]: $*"
+	echo "$log_string" >> "$SETT_DAEMON_LOGS_WORK_FILE"
+}
+
+loop() {
+	# Include body
+	. "$SETT_DAEMON_PATH/loop.sh"
+}
+
+start() {
+	check
+	if [ -f "$SETT_DAEMON_PID_FILE" ]; then
+		_pid=`$UTIL_CAT $SETT_DAEMON_PID_FILE`
+		is_pid_runned "$_pid" rbool
+		if [ "$rbool" = "1" ]; then
+			log_str "0" "Daemon already running with pid = $_pid"
+			echo "Daemon already running with pid = $_pid"
+			exit 0
+		fi
+	fi
+	cd /
+	if [ "$SETT_DAEMON_MODE" = 1 ]; then
+		exec >> $SETT_DAEMON_LOGS_WORK_FILE
+		exec 2>> $SETT_DAEMON_LOGS_WORK_FILE
+		exec < /dev/null
+		(
+			while [ 1 ]
+			do
+				loop
+				sleep 1
+			done
+			exit 0
+		)&
+		echo $! > $SETT_DAEMON_PID_FILE
+	else
+		while [ 1 ]
+		do
+			loop
+			sleep 1
+		done
+		exit 0
+	fi
+}
+
+stop() {
+	if [ -f "$SETT_DAEMON_PID_FILE" ]; then
+		_pid=`$UTIL_CAT $SETT_DAEMON_PID_FILE`
+		`$UTIL_KILL $_pid`
+		rt="$?"
+		if [ "$rt" = "0" ]; then
+			log_str "0" "Daemon stoped"
+			echo "Daemon stoped"
+			`$UTIL_RM $SETT_DAEMON_PID_FILE`
+		else
+			log_str "0" "Error stop daemon"
+			echo "Error stop daemon"
+		fi
+	else
+		log_str "0" "Daemon is not runned"
+		echo "Daemon is not runned"
+	fi
+}
+
+status() {
+	if [ -f "$SETT_DAEMON_PID_FILE" ]; then
+		_pid=`$UTIL_CAT $SETT_DAEMON_PID_FILE`
+		is_pid_runned "$_pid" rbool
+		if [ "$rbool" = "1" ]; then
+			echo "Daemon is runned with pid = $_pid"
+		else
+			echo "Daemon is not runned"
+		fi
+	else
+		echo "Daemon is not runned"
+	fi
+}
+
+usage() {
+	echo "$0 (once|start|stop|status)"
+}
+
+case $1 in
+	"once")
+		SETT_DAEMON_MODE=0
+		start
+		;;
+	"start")
+		start
+		;;
+	"stop")
+		stop
+		;;
+	"status")
+		status
+		;;
+	*)
+		usage
+		;;
+esac
+exit