#!/usr/bin/env bash

#TODO(critical): handle conflict prevalance, especially in sync_attrs function
#TODO(critical): writelockfiles remote does not shut execution

PROGRAM="osync" # Rsync based two way sync engine with fault tolerance
AUTHOR="(C) 2013-2016 by Orsiris de Jong"
CONTACT="http://www.netpower.fr/osync - ozy@netpower.fr"
PROGRAM_VERSION=1.2-dev-parallel
PROGRAM_BUILD=2016082201
IS_STABLE=no



#### MINIMAL-FUNCTION-SET BEGIN ####

## FUNC_BUILD=2016082204
## BEGIN Generic functions for osync & obackup written in 2013-2016 by Orsiris de Jong - http://www.netpower.fr - ozy@netpower.fr

## type -p does not work on platforms other than linux (bash). If if does not work, always assume output is not a zero exitcode
if ! type "$BASH" > /dev/null; then
	echo "Please run this script only with bash shell. Tested on bash >= 3.2"
	exit 127
fi

## Correct output of sort command (language agnostic sorting)
export LC_ALL=C

# Standard alert mail body
MAIL_ALERT_MSG="Execution of $PROGRAM instance $INSTANCE_ID on $(date) has warnings/errors."

# Environment variables that can be overriden by programs
_DRYRUN=0
_SILENT=0
_LOGGER_PREFIX="date"
_LOGGER_STDERR=0
if [ "$KEEP_LOGGING" == "" ]; then
        KEEP_LOGGING=1801
fi

# Initial error status, logging 'WARN', 'ERROR' or 'CRITICAL' will enable alerts flags
ERROR_ALERT=0
WARN_ALERT=0


## allow debugging from command line with _DEBUG=yes
if [ ! "$_DEBUG" == "yes" ]; then
	_DEBUG=no
	SLEEP_TIME=.05 # Tested under linux and FreeBSD bash, #TODO tests on cygwin / msys
	_VERBOSE=0
else
	SLEEP_TIME=1
	trap 'TrapError ${LINENO} $?' ERR
	_VERBOSE=1
fi

SCRIPT_PID=$$

LOCAL_USER=$(whoami)
LOCAL_HOST=$(hostname)

## Default log file until config file is loaded
if [ -w /var/log ]; then
	LOG_FILE="/var/log/$PROGRAM.log"
elif ([ "$HOME" != "" ] && [ -w "$HOME" ]); then
	LOG_FILE="$HOME/$PROGRAM.log"
else
	LOG_FILE="./$PROGRAM.log"
fi

## Default directory where to store temporary run files
if [ -w /tmp ]; then
	RUN_DIR=/tmp
elif [ -w /var/tmp ]; then
	RUN_DIR=/var/tmp
else
	RUN_DIR=.
fi


# Default alert attachment filename
ALERT_LOG_FILE="$RUN_DIR/$PROGRAM.last.log"

# Set error exit code if a piped command fails
	set -o pipefail
	set -o errtrace


function Dummy {

	sleep $SLEEP_TIME
}

# Sub function of Logger
function _Logger {
	local svalue="${1}" # What to log to stdout
	local lvalue="${2:-$svalue}" # What to log to logfile, defaults to screen value
	local evalue="${3}" # What to log to stderr

	echo -e "$lvalue" >> "$LOG_FILE"

	if [ "$_LOGGER_STDERR" -eq 1 ]; then
		cat <<< "$evalue" 1>&2
	elif [ "$_SILENT" -eq 0 ]; then
		echo -e "$svalue"
	fi
}

# General log function with log levels
function Logger {
	local value="${1}" # Sentence to log (in double quotes)
	local level="${2}" # Log level: PARANOIA_DEBUG, DEBUG, NOTICE, WARN, ERROR, CRITIAL

	if [ "$_LOGGER_PREFIX" == "time" ]; then
		prefix="TIME: $SECONDS - "
	elif [ "$_LOGGER_PREFIX" == "date" ]; then
		prefix="$(date) - "
	else
		prefix=""
	fi

	if [ "$level" == "CRITICAL" ]; then
		_Logger "$prefix\e[41m$value\e[0m" "$prefix$level:$value" "$level:$value"
		ERROR_ALERT=1
		return
	elif [ "$level" == "ERROR" ]; then
		_Logger "$prefix\e[91m$value\e[0m" "$prefix$level:$value" "$level:$value"
		ERROR_ALERT=1
		return
	elif [ "$level" == "WARN" ]; then
		_Logger "$prefix\e[93m$value\e[0m" "$prefix$level:$value" "$level:$value"
		WARN_ALERT=1
		return
	elif [ "$level" == "NOTICE" ]; then
		_Logger "$prefix$value"
		return
	elif [ "$level" == "DEBUG" ]; then
		if [ "$_DEBUG" == "yes" ]; then
			_Logger "$prefix$value"
			return
		fi
	else
		_Logger "\e[41mLogger function called without proper loglevel.\e[0m"
		_Logger "$prefix$value"
	fi
}

# QuickLogger subfunction, can be called directly
function _QuickLogger {
	local value="${1}"
	local destination="${2}" # Destination: stdout, log, both


	if ([ "$destination" == "log" ] || [ "$destination" == "both" ]); then
		echo -e "$(date) - $value" >> "$LOG_FILE"
	elif ([ "$destination" == "stdout" ] || [ "$destination" == "both" ]); then
		echo -e "$value"
	fi
}

# Generic quick logging function
function QuickLogger {
	local value="${1}"


	if [ "$_SILENT" -eq 1 ]; then
		_QuickLogger "$value" "log"
	else
		_QuickLogger "$value" "stdout"
	fi
}

# Portable child (and grandchild) kill function tester under Linux, BSD and MacOS X
function KillChilds {
	local pid="${1}" # Parent pid to kill childs
	local self="${2:-false}" # Should parent be killed too ?


	if children="$(pgrep -P "$pid")"; then
		for child in $children; do
			KillChilds "$child" true
		done
	fi
		# Try to kill nicely, if not, wait 15 seconds to let Trap actions happen before killing
	if ( [ "$self" == true ] && kill -0 $pid > /dev/null 2>&1); then
		Logger "Sending SIGTERM to process [$pid]." "DEBUG"
		kill -s TERM "$pid"
		if [ $? != 0 ]; then
			sleep 15
			Logger "Sending SIGTERM to process [$pid] failed." "DEBUG"
			kill -9 "$pid"
			if [ $? != 0 ]; then
				Logger "Sending SIGKILL to process [$pid] failed." "DEBUG"
				return 1
			fi
		else
			return 0
		fi
	else
		return 0
	fi
}

function KillAllChilds {
	local pids="${1}" # List of parent pids to kill separated by semi-colon
	local self="${2:-false}" # Should parent be killed too ?


	local errorcount=0

	IFS=';' read -a pidsArray <<< "$pids"
	for pid in "${pidsArray[@]}"; do
		KillChilds $pid $self
		if [ $? != 0 ]; then
			errorcount=$((errorcount+1))
			fi
	done
	return $errorcount
}

# osync/obackup/pmocr script specific mail alert function, use SendEmail function for generic mail sending
function SendAlert {

	local mail_no_attachment=
	local attachment_command=
	local subject=

	# Windows specific settings
	local encryption_string=
	local auth_string=

	if [ "$DESTINATION_MAILS" == "" ]; then
		return 0
	fi

	if [ "$_DEBUG" == "yes" ]; then
		Logger "Debug mode, no warning mail will be sent." "NOTICE"
		return 0
	fi

	# <OSYNC SPECIFIC>
	if [ "$_QUICK_SYNC" == "2" ]; then
		Logger "Current task is a quicksync task. Will not send any alert." "NOTICE"
		return 0
	fi
	# </OSYNC SPECIFIC>

	eval "cat \"$LOG_FILE\" $COMPRESSION_PROGRAM > $ALERT_LOG_FILE"
	if [ $? != 0 ]; then
		Logger "Cannot create [$ALERT_LOG_FILE]" "WARN"
		mail_no_attachment=1
	else
		mail_no_attachment=0
	fi
	MAIL_ALERT_MSG="$MAIL_ALERT_MSG"$'\n\n'$(tail -n 50 "$LOG_FILE")
	if [ $ERROR_ALERT -eq 1 ]; then
		subject="Error alert for $INSTANCE_ID"
	elif [ $WARN_ALERT -eq 1 ]; then
		subject="Warning alert for $INSTANCE_ID"
	else
		subject="Alert for $INSTANCE_ID"
	fi

	if [ "$mail_no_attachment" -eq 0 ]; then
		attachment_command="-a $ALERT_LOG_FILE"
	fi
	if type mutt > /dev/null 2>&1 ; then
		echo "$MAIL_ALERT_MSG" | $(type -p mutt) -x -s "$subject" $DESTINATION_MAILS $attachment_command
		if [ $? != 0 ]; then
			Logger "Cannot send alert mail via $(type -p mutt) !!!" "WARN"
		else
			Logger "Sent alert mail using mutt." "NOTICE"
			return 0
		fi
	fi

	if type mail > /dev/null 2>&1 ; then
		if [ "$mail_no_attachment" -eq 0 ] && $(type -p mail) -V | grep "GNU" > /dev/null; then
			attachment_command="-A $ALERT_LOG_FILE"
		elif [ "$mail_no_attachment" -eq 0 ] && $(type -p mail) -V > /dev/null; then
			attachment_command="-a$ALERT_LOG_FILE"
		else
			attachment_command=""
		fi
		echo "$MAIL_ALERT_MSG" | $(type -p mail) $attachment_command -s "$subject" $DESTINATION_MAILS
		if [ $? != 0 ]; then
			Logger "Cannot send alert mail via $(type -p mail) with attachments !!!" "WARN"
			echo "$MAIL_ALERT_MSG" | $(type -p mail) -s "$subject" $DESTINATION_MAILS
			if [ $? != 0 ]; then
				Logger "Cannot send alert mail via $(type -p mail) without attachments !!!" "WARN"
			else
				Logger "Sent alert mail using mail command without attachment." "NOTICE"
				return 0
			fi
		else
			Logger "Sent alert mail using mail command." "NOTICE"
			return 0
		fi
	fi

	if type sendmail > /dev/null 2>&1 ; then
		echo -e "Subject:$subject\r\n$MAIL_ALERT_MSG" | $(type -p sendmail) $DESTINATION_MAILS
		if [ $? != 0 ]; then
			Logger "Cannot send alert mail via $(type -p sendmail) !!!" "WARN"
		else
			Logger "Sent alert mail using sendmail command without attachment." "NOTICE"
			return 0
		fi
	fi

	# Windows specific
	if type "mailsend.exe" > /dev/null 2>&1 ; then

		if [ "$SMTP_ENCRYPTION" != "tls" ] && [ "$SMTP_ENCRYPTION" != "ssl" ]  && [ "$SMTP_ENCRYPTION" != "none" ]; then
			Logger "Bogus smtp encryption, assuming none." "WARN"
			encryption_string=
		elif [ "$SMTP_ENCRYPTION" == "tls" ]; then
			encryption_string=-starttls
		elif [ "$SMTP_ENCRYPTION" == "ssl" ]:; then
			encryption_string=-ssl
		fi
		if [ "$SMTP_USER" != "" ] && [ "$SMTP_USER" != "" ]; then
			auth_string="-auth -user \"$SMTP_USER\" -pass \"$SMTP_PASSWORD\""
		fi
		$(type mailsend.exe) -f $SENDER_MAIL -t "$DESTINATION_MAILS" -sub "$subject" -M "$MAIL_ALERT_MSG" -attach "$attachment" -smtp "$SMTP_SERVER" -port "$SMTP_PORT" $encryption_string $auth_string
		if [ $? != 0 ]; then
			Logger "Cannot send mail via $(type mailsend.exe) !!!" "WARN"
		else
			Logger "Sent mail using mailsend.exe command with attachment." "NOTICE"
			return 0
		fi
	fi

	# Windows specific, kept for compatibility (sendemail from http://caspian.dotconf.net/menu/Software/SendEmail/)
	if type sendemail > /dev/null 2>&1 ; then
		if [ "$SMTP_USER" != "" ] && [ "$SMTP_PASSWORD" != "" ]; then
			SMTP_OPTIONS="-xu $SMTP_USER -xp $SMTP_PASSWORD"
		else
			SMTP_OPTIONS=""
		fi
		$(type -p sendemail) -f $SENDER_MAIL -t "$DESTINATION_MAILS" -u "$subject" -m "$MAIL_ALERT_MSG" -s $SMTP_SERVER $SMTP_OPTIONS > /dev/null 2>&1
		if [ $? != 0 ]; then
			Logger "Cannot send alert mail via $(type -p sendemail) !!!" "WARN"
		else
			Logger "Sent alert mail using sendemail command without attachment." "NOTICE"
			return 0
		fi
	fi

	# pfSense specific
	if [ -f /usr/local/bin/mail.php ]; then
		echo "$MAIL_ALERT_MSG" | /usr/local/bin/mail.php -s="$subject"
		if [ $? != 0 ]; then
			Logger "Cannot send alert mail via /usr/local/bin/mail.php (pfsense) !!!" "WARN"
		else
			Logger "Sent alert mail using pfSense mail.php." "NOTICE"
			return 0
		fi
	fi

	# If function has not returned 0 yet, assume it is critical that no alert can be sent
	Logger "Cannot send alert (neither mutt, mail, sendmail, mailsend, sendemail or pfSense mail.php could be used)." "ERROR" # Is not marked critical because execution must continue

	# Delete tmp log file
	if [ -f "$ALERT_LOG_FILE" ]; then
		rm "$ALERT_LOG_FILE"
	fi
}

# Generic email sending function.
# Usage (linux / BSD), attachment is optional, can be "/path/to/my.file" or ""
# SendEmail "subject" "Body text" "receiver@example.com receiver2@otherdomain.com" "/path/to/attachment.file"
# Usage (Windows, make sure you have mailsend.exe in executable path, see http://github.com/muquit/mailsend)
# attachment is optional but must be in windows format like "c:\\some\path\\my.file", or ""
# smtp_server.domain.tld is mandatory, as is smtp_port (should be 25, 465 or 587)
# encryption can be set to tls, ssl or none
# smtp_user and smtp_password are optional
# SendEmail "subject" "Body text" "receiver@example.com receiver2@otherdomain.com" "/path/to/attachment.file" "sender_email@example.com" "smtp_server.domain.tld" "smtp_port" "encryption" "smtp_user" "smtp_password"
function SendEmail {
	local subject="${1}"
	local message="${2}"
	local destination_mails="${3}"
	local attachment="${4}"
	local sender_email="${5}"
	local smtp_server="${6}"
	local smtp_port="${7}"
	local encryption="${8}"
	local smtp_user="${9}"
	local smtp_password="${10}"

	# CheckArguments will report a warning that can be ignored if used in Windows with paranoia debug enabled

	local mail_no_attachment=
	local attachment_command=

	local encryption_string=
	local auth_string=

	if [ ! -f "$attachment" ]; then
		attachment_command="-a $ALERT_LOG_FILE"
		mail_no_attachment=1
	else
		mail_no_attachment=0
	fi

	if type mutt > /dev/null 2>&1 ; then
		echo "$message" | $(type -p mutt) -x -s "$subject" "$destination_mails" $attachment_command
		if [ $? != 0 ]; then
			Logger "Cannot send mail via $(type -p mutt) !!!" "WARN"
		else
			Logger "Sent mail using mutt." "NOTICE"
			return 0
		fi
	fi

	if type mail > /dev/null 2>&1 ; then
		if [ "$mail_no_attachment" -eq 0 ] && $(type -p mail) -V | grep "GNU" > /dev/null; then
			attachment_command="-A $attachment"
		elif [ "$mail_no_attachment" -eq 0 ] && $(type -p mail) -V > /dev/null; then
			attachment_command="-a$attachment"
		else
			attachment_command=""
		fi
		echo "$message" | $(type -p mail) $attachment_command -s "$subject" "$destination_mails"
		if [ $? != 0 ]; then
			Logger "Cannot send mail via $(type -p mail) with attachments !!!" "WARN"
			echo "$message" | $(type -p mail) -s "$subject" "$destination_mails"
			if [ $? != 0 ]; then
				Logger "Cannot send mail via $(type -p mail) without attachments !!!" "WARN"
			else
				Logger "Sent mail using mail command without attachment." "NOTICE"
				return 0
			fi
		else
			Logger "Sent mail using mail command." "NOTICE"
			return 0
		fi
	fi

	if type sendmail > /dev/null 2>&1 ; then
		echo -e "Subject:$subject\r\n$message" | $(type -p sendmail) "$destination_mails"
		if [ $? != 0 ]; then
			Logger "Cannot send mail via $(type -p sendmail) !!!" "WARN"
		else
			Logger "Sent mail using sendmail command without attachment." "NOTICE"
			return 0
		fi
	fi

	# Windows specific
	if type "mailsend.exe" > /dev/null 2>&1 ; then
		if [ "$sender_email" == "" ]; then
			Logger "Missing sender email." "ERROR"
			return 1
		fi
		if [ "$smtp_server" == "" ]; then
			Logger "Missing smtp port." "ERROR"
			return 1
		fi
		if [ "$smtp_port" == "" ]; then
			Logger "Missing smtp port, assuming 25." "WARN"
			smtp_port=25
		fi
		if [ "$encryption" != "tls" ] && [ "$encryption" != "ssl" ]  && [ "$encryption" != "none" ]; then
			Logger "Bogus smtp encryption, assuming none." "WARN"
			encryption_string=
		elif [ "$encryption" == "tls" ]; then
			encryption_string=-starttls
		elif [ "$encryption" == "ssl" ]:; then
			encryption_string=-ssl
		fi
		if [ "$smtp_user" != "" ] && [ "$smtp_password" != "" ]; then
			auth_string="-auth -user \"$smtp_user\" -pass \"$smtp_password\""
		fi
		$(type mailsend.exe) -f "$sender_email" -t "$destination_mails" -sub "$subject" -M "$message" -attach "$attachment" -smtp "$smtp_server" -port "$smtp_port" $encryption_string $auth_string
		if [ $? != 0 ]; then
			Logger "Cannot send mail via $(type mailsend.exe) !!!" "WARN"
		else
			Logger "Sent mail using mailsend.exe command with attachment." "NOTICE"
			return 0
		fi
	fi

	# pfSense specific
	if [ -f /usr/local/bin/mail.php ]; then
		echo "$message" | /usr/local/bin/mail.php -s="$subject"
		if [ $? != 0 ]; then
			Logger "Cannot send mail via /usr/local/bin/mail.php (pfsense) !!!" "WARN"
		else
			Logger "Sent mail using pfSense mail.php." "NOTICE"
			return 0
		fi
	fi

	# If function has not returned 0 yet, assume it is critical that no alert can be sent
	Logger "Cannot send mail (neither mutt, mail, sendmail, sendemail, mailsend (windows) or pfSense mail.php could be used)." "ERROR" # Is not marked critical because execution must continue
}

function TrapError {
	local job="$0"
	local line="$1"
	local code="${2:-1}"
	if [ $_SILENT -eq 0 ]; then
		echo -e " /!\ ERROR in ${job}: Near line ${line}, exit code ${code}"
	fi
}

function LoadConfigFile {
	local config_file="${1}"


	if [ ! -f "$config_file" ]; then
		Logger "Cannot load configuration file [$config_file]. Cannot start." "CRITICAL"
		exit 1
	elif [[ "$1" != *".conf" ]]; then
		Logger "Wrong configuration file supplied [$config_file]. Cannot start." "CRITICAL"
		exit 1
	else
		grep '^[^ ]*=[^;&]*' "$config_file" > "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID" # WITHOUT COMMENTS
		# Shellcheck source=./sync.conf
		source "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID"
	fi

	CONFIG_FILE="$config_file"
}

function Spinner {
	if [ $_SILENT -eq 1 ]; then
		return 0
	fi

	case $toggle
	in
	1)
	echo -n " \ "
	echo -ne "\r"
	toggle="2"
	;;

	2)
	echo -n " | "
	echo -ne "\r"
	toggle="3"
	;;

	3)
	echo -n " / "
	echo -ne "\r"
	toggle="4"
	;;

	*)
	echo -n " - "
	echo -ne "\r"
	toggle="1"
	;;
	esac
}

# Array to string converter, see http://stackoverflow.com/questions/1527049/bash-join-elements-of-an-array
# usage: joinString separaratorChar Array
function joinString {
	local IFS="$1"; shift; echo "$*";
}

# Time control function for background processes, suitable for multiple synchronous processes
# Fills a global variable called WAIT_FOR_TASK_COMPLETION that contains list of failed pids in format pid1:result1;pid2:result2
# Warning: Don't imbricate this function into another run if you plan to use the global variable output
function WaitForTaskCompletion {
	local pids="${1}" # pids to wait for, separated by semi-colon
	local soft_max_time="${2}" # If program with pid $pid takes longer than $soft_max_time seconds, will log a warning, unless $soft_max_time equals 0.
	local hard_max_time="${3}" # If program with pid $pid takes longer than $hard_max_time seconds, will stop execution, unless $hard_max_time equals 0.
	local caller_name="${4}" # Who called this function
	local counting="${5:-true}" # Count time since function has been launched if true, since script has been launched if false
	local keep_logging="${6:-0}" # Log a standby message every X seconds. Set to zero to disable logging


	local soft_alert=0 # Does a soft alert need to be triggered, if yes, send an alert once
	local log_ttime=0 # local time instance for comparaison

	local seconds_begin=$SECONDS # Seconds since the beginning of the script
	local exec_time=0 # Seconds since the beginning of this function

	local retval=0 # return value of monitored pid process
	local errorcount=0 # Number of pids that finished with errors

	local pidCount # number of given pids
	local pidState # State of the process

	IFS=';' read -a pidsArray <<< "$pids"
	pidCount=${#pidsArray[@]}

	WAIT_FOR_TASK_COMPLETION=""

	while [ ${#pidsArray[@]} -gt 0 ]; do
		newPidsArray=()

		Spinner
		if [ $counting == true ]; then
			exec_time=$(($SECONDS - $seconds_begin))
		else
			exec_time=$SECONDS
		fi

		if [ $keep_logging -ne 0 ]; then
			if [ $((($exec_time + 1) % $keep_logging)) -eq 0 ]; then
				if [ $log_ttime -ne $exec_time ]; then # Fix when sleep time lower than 1s
					log_ttime=$exec_time
					Logger "Current tasks still running with pids [$(joinString , ${pidsArray[@]})]." "NOTICE"
				fi
			fi
		fi

		if [ $exec_time -gt $soft_max_time ]; then
			if [ $soft_alert -eq 0 ] && [ $soft_max_time -ne 0 ]; then
				Logger "Max soft execution time exceeded for task [$caller_name] with pids [$(joinString , ${pidsArray[@]})]." "WARN"
				soft_alert=1
				SendAlert

			fi
			if [ $exec_time -gt $hard_max_time ] && [ $hard_max_time -ne 0 ]; then
				Logger "Max hard execution time exceeded for task [$caller_name] with pids [$(joinString , ${pidsArray[@]})]. Stopping task execution." "ERROR"
				for pid in "${pidsArray[@]}"; do
					KillChilds $pid true
					if [ $? == 0 ]; then
						Logger "Task with pid [$pid] stopped successfully." "NOTICE"
					else
						Logger "Could not stop task with pid [$pid]." "ERROR"
					fi
				done
				SendAlert
				errrorcount=$((errorcount+1))
			fi
		fi

		for pid in "${pidsArray[@]}"; do
			if kill -0 $pid > /dev/null 2>&1; then
				# Handle uninterruptible sleep state or zombies by ommiting them from running process array (How to kill that is already dead ? :)
				#TODO(high): have this tested on *BSD, Mac & Win
				pidState=$(ps -p$pid -o state= 2 > /dev/null)
				if [ "$pidState" != "D" ] && [ "$pidState" != "Z" ]; then
					newPidsArray+=($pid)
				fi
			else
				# pid is dead, get it's exit code from wait command
				wait $pid
				retval=$?
				if [ $retval -ne 0 ]; then
					errorcount=$((errorcount+1))
					Logger "${FUNCNAME[0]} called by [$caller_name] finished monitoring [$pid] with exitcode [$result]." "DEBUG"
					if [ "$WAIT_FOR_TASK_COMPLETION" == "" ]; then
						WAIT_FOR_TASK_COMPLETION="$pid:$result"
					else
						WAIT_FOR_TASK_COMPLETION=";$pid:$result"
					fi
				fi
			fi
		done

		pidsArray=("${newPidsArray[@]}")
		sleep $SLEEP_TIME
	done


	# Return exit code if only one process was monitored, else return number of errors
	if [ $pidCount -eq 1 ] && [ $errorcount -eq 0 ]; then
		return $errorcount
	else
		return $errorcount
	fi
}

function CleanUp {

	if [ "$_DEBUG" != "yes" ]; then
		rm -f "$RUN_DIR/$PROGRAM."*".$SCRIPT_PID"
		# Fix for sed -i requiring backup extension for BSD & Mac (see all sed -i statements)
		rm -f "$RUN_DIR/$PROGRAM."*".$SCRIPT_PID.tmp"
	fi
}

#### MINIMAL-FUNCTION-SET END ####

# obsolete, use StripQuotes
function SedStripQuotes {
	echo $(echo $1 | sed "s/^\([\"']\)\(.*\)\1\$/\2/g")
}

# Usage: var=$(StripSingleQuotes "$var")
function StripSingleQuotes {
	local string="${1}"
	string="${string/#\'/}" # Remove singlequote if it begins string
	string="${string/%\'/}" # Remove singlequote if it ends string
	echo "$string"
}

# Usage: var=$(StripDoubleQuotes "$var")
function StripDoubleQuotes {
	local string="${1}"
	string="${string/#\"/}"
	string="${string/%\"/}"
	echo "$string"
}

function StripQuotes {
	local string="${1}"
	echo "$(StripSingleQuotes $(StripDoubleQuotes $string))"
}

function EscapeSpaces {
	local string="${1}" # String on which spaces will be escaped
	echo "${string// /\ }"
}

function IsNumeric {
	eval "local value=\"${1}\"" # Needed eval so variable variables can be processed

	local re="^-?[0-9]+([.][0-9]+)?$"
	if [[ $value =~ $re ]]; then
		echo 1
	else
		echo 0
	fi
}

## from https://gist.github.com/cdown/1163649
function urlEncode {
	local length="${#1}"

	local LANG=C
	for (( i = 0; i < length; i++ )); do
		local c="${1:i:1}"
		case $c in
			[a-zA-Z0-9.~_-])
			printf "$c"
			;;
			*)
			printf '%%%02X' "'$c"
			;;
		esac
	done
}

function urlDecode {
	local url_encoded="${1//+/ }"

	printf '%b' "${url_encoded//%/\\x}"
}

function GetLocalOS {

	local local_os_var=

	local_os_var="$(uname -spio 2>&1)"
	if [ $? != 0 ]; then
		local_os_var="$(uname -v 2>&1)"
		if [ $? != 0 ]; then
			local_os_var="$(uname)"
		fi
	fi

	case $local_os_var in
		*"Linux"*)
		LOCAL_OS="Linux"
		;;
		*"BSD"*)
		LOCAL_OS="BSD"
		;;
		*"MINGW32"*|*"CYGWIN"*)
		LOCAL_OS="msys"
		;;
		*"Darwin"*)
		LOCAL_OS="MacOSX"
		;;
		*)
		if [ "$IGNORE_OS_TYPE" == "yes" ]; then		#DOC: Undocumented option
			Logger "Running on unknown local OS [$local_os_var]." "WARN"
			return
		fi
		Logger "Running on >> $local_os_var << not supported. Please report to the author." "ERROR"
		exit 1
		;;
	esac
	Logger "Local OS: [$local_os_var]." "DEBUG"
}

function GetRemoteOS {

	local cmd=
	local remote_os_var=


	if [ "$REMOTE_OPERATION" == "yes" ]; then
		CheckConnectivity3rdPartyHosts
		CheckConnectivityRemoteHost
		cmd=$SSH_CMD' "uname -spio" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'" 2>&1'
		Logger "cmd: $cmd" "DEBUG"
		eval "$cmd" &
		WaitForTaskCompletion $! 120 240 ${FUNCNAME[0]}"-1" true $KEEP_LOGGING
		retval=$?
		if [ $retval != 0 ]; then
			cmd=$SSH_CMD' "uname -v" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'" 2>&1'
			Logger "cmd: $cmd" "DEBUG"
			eval "$cmd" &
			WaitForTaskCompletion $! 120 240 ${FUNCNAME[0]}"-2" true $KEEP_LOGGING
			retval=$?
			if [ $retval != 0 ]; then
				cmd=$SSH_CMD' "uname" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'" 2>&1'
				Logger "cmd: $cmd" "DEBUG"
				eval "$cmd" &
				WaitForTaskCompletion $! 120 240 ${FUNCNAME[0]}"-3" true $KEEP_LOGGING
				retval=$?
				if [ $retval != 0 ]; then
					Logger "Cannot Get remote OS type." "ERROR"
				fi
			fi
		fi

		remote_os_var=$(cat "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID")

		case $remote_os_var in
			*"Linux"*)
			REMOTE_OS="Linux"
			;;
			*"BSD"*)
			REMOTE_OS="BSD"
			;;
			*"MINGW32"*|*"CYGWIN"*)
			REMOTE_OS="msys"
			;;
			*"Darwin"*)
			REMOTE_OS="MacOSX"
			;;
			*"ssh"*|*"SSH"*)
			Logger "Cannot connect to remote system." "CRITICAL"
			exit 1
			;;
			*)
			if [ "$IGNORE_OS_TYPE" == "yes" ]; then		#DOC: Undocumented option
				Logger "Running on unknown remote OS [$remote_os_var]." "WARN"
				return
			fi
			Logger "Running on remote OS failed. Please report to the author if the OS is not supported." "CRITICAL"
			Logger "Remote OS said:\n$remote_os_var" "CRITICAL"
			exit 1
		esac

		Logger "Remote OS: [$remote_os_var]." "DEBUG"
	fi
}

function RunLocalCommand {
	local command="${1}" # Command to run
	local hard_max_time="${2}" # Max time to wait for command to compleet

	if [ $_DRYRUN -ne 0 ]; then
		Logger "Dryrun: Local command [$command] not run." "NOTICE"
		return 0
	fi

	Logger "Running command [$command] on local host." "NOTICE"
	eval "$command" > "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID" 2>&1 &
	WaitForTaskCompletion $! 0 $hard_max_time ${FUNCNAME[0]} true $KEEP_LOGGING
	retval=$?
	if [ $retval -eq 0 ]; then
		Logger "Command succeded." "NOTICE"
	else
		Logger "Command failed." "ERROR"
	fi

	if [ $_VERBOSE -eq 1 ] || [ $retval -ne 0 ]; then
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
	fi

	if [ "$STOP_ON_CMD_ERROR" == "yes" ] && [ $retval -ne 0 ]; then
		Logger "Stopping on command execution error." "CRITICAL"
		exit 1
	fi
}

## Runs remote command $1 and waits for completition in $2 seconds
function RunRemoteCommand {
	local command="${1}" # Command to run
	local hard_max_time="${2}" # Max time to wait for command to compleet

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost
	if [ $_DRYRUN -ne 0 ]; then
		Logger "Dryrun: Local command [$command] not run." "NOTICE"
		return 0
	fi

	Logger "Running command [$command] on remote host." "NOTICE"
	cmd=$SSH_CMD' "$command" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd" &
	WaitForTaskCompletion $! 0 $hard_max_time ${FUNCNAME[0]} true $KEEP_LOGGING
	retval=$?
	if [ $retval -eq 0 ]; then
		Logger "Command succeded." "NOTICE"
	else
		Logger "Command failed." "ERROR"
	fi

	if [ -f "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID" ] && ([ $_VERBOSE -eq 1 ] || [ $retval -ne 0 ])
	then
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
	fi

	if [ "$STOP_ON_CMD_ERROR" == "yes" ] && [ $retval -ne 0 ]; then
		Logger "Stopping on command execution error." "CRITICAL"
		exit 1
	fi
}

function RunBeforeHook {

	local pids=

	if [ "$LOCAL_RUN_BEFORE_CMD" != "" ]; then
		RunLocalCommand "$LOCAL_RUN_BEFORE_CMD" $MAX_EXEC_TIME_PER_CMD_BEFORE &
		pids="$!"
	fi

	if [ "$REMOTE_RUN_BEFORE_CMD" != "" ]; then
		RunRemoteCommand "$REMOTE_RUN_BEFORE_CMD" $MAX_EXEC_TIME_PER_CMD_BEFORE &
		pids="$pids;$!"
	fi
	if [ "$pids" != "" ]; then
		WaitForTaskCompletion $pids 0 0 ${FUNCNAME[0]} true $KEEP_LOGGING
	fi
}

function RunAfterHook {

	local pids

	if [ "$LOCAL_RUN_AFTER_CMD" != "" ]; then
		RunLocalCommand "$LOCAL_RUN_AFTER_CMD" $MAX_EXEC_TIME_PER_CMD_AFTER &
		pids="$!"
	fi

	if [ "$REMOTE_RUN_AFTER_CMD" != "" ]; then
		RunRemoteCommand "$REMOTE_RUN_AFTER_CMD" $MAX_EXEC_TIME_PER_CMD_AFTER &
		pids="$pids;$!"
	fi
	if [ "$pids" != "" ]; then
		WaitForTaskCompletion $pids 0 0 ${FUNCNAME[0]} true $KEEP_LOGGING
	fi
}

function CheckConnectivityRemoteHost {

	if [ "$_PARANOIA_DEBUG" != "yes" ]; then # Do not loose time in paranoia debug

		if [ "$REMOTE_HOST_PING" != "no" ] && [ "$REMOTE_OPERATION" != "no" ]; then
			eval "$PING_CMD $REMOTE_HOST > /dev/null 2>&1" &
			WaitForTaskCompletion $! 10 180 ${FUNCNAME[0]} true $KEEP_LOGGING
			if [ $? != 0 ]; then
				Logger "Cannot ping $REMOTE_HOST" "ERROR"
				return 1
			fi
		fi
	fi
}

function CheckConnectivity3rdPartyHosts {

	local remote_3rd_party_success
	local pids

	if [ "$_PARANOIA_DEBUG" != "yes" ]; then # Do not loose time in paranoia debug

		if [ "$REMOTE_3RD_PARTY_HOSTS" != "" ]; then
			remote_3rd_party_success=0
			for i in $REMOTE_3RD_PARTY_HOSTS
			do
				eval "$PING_CMD $i > /dev/null 2>&1" &
				WaitForTaskCompletion $! 180 360 ${FUNCNAME[0]} true $KEEP_LOGGING
				if [ $? != 0 ]; then
					Logger "Cannot ping 3rd party host $i" "NOTICE"
				else
					remote_3rd_party_success=1
				fi
			done

			if [ $remote_3rd_party_success -ne 1 ]; then
				Logger "No remote 3rd party host responded to ping. No internet ?" "ERROR"
				return 1
			else
				return 0
			fi
		fi
	fi
}

#__BEGIN_WITH_PARANOIA_DEBUG
#__END_WITH_PARANOIA_DEBUG

function RsyncPatternsAdd {
	local pattern_type="${1}"	# exclude or include
	local pattern="${2}"

	local rest

	# Disable globbing so wildcards from exclusions do not get expanded
	set -f
	rest="$pattern"
	while [ -n "$rest" ]
	do
		# Take the string until first occurence until $PATH_SEPARATOR_CHAR
		str=${rest%%;*}
		# Handle the last case
		if [ "$rest" = "${rest/$PATH_SEPARATOR_CHAR/}" ]; then
			rest=
		else
			# Cut everything before the first occurence of $PATH_SEPARATOR_CHAR
			rest=${rest#*$PATH_SEPARATOR_CHAR}
		fi
			if [ "$RSYNC_PATTERNS" == "" ]; then
			RSYNC_PATTERNS="--"$pattern_type"=\"$str\""
		else
			RSYNC_PATTERNS="$RSYNC_PATTERNS --"$pattern_type"=\"$str\""
		fi
	done
	set +f
}

function RsyncPatternsFromAdd {
	local pattern_type="${1}"
	local pattern_from="${2}"

	## Check if the exclude list has a full path, and if not, add the config file path if there is one
	if [ "$(basename $pattern_from)" == "$pattern_from" ]; then
		pattern_from="$(dirname $CONFIG_FILE)/$pattern_from"
	fi

	if [ -e "$pattern_from" ]; then
		RSYNC_PATTERNS="$RSYNC_PATTERNS --"$pattern_type"-from=\"$pattern_from\""
	fi
}

function RsyncPatterns {

       if [ "$RSYNC_PATTERN_FIRST" == "exclude" ]; then
		if [ "$RSYNC_EXCLUDE_PATTERN" != "" ]; then
			RsyncPatternsAdd "exclude" "$RSYNC_EXCLUDE_PATTERN"
		fi
		if [ "$RSYNC_EXCLUDE_FROM" != "" ]; then
			RsyncPatternsFromAdd "exclude" "$RSYNC_EXCLUDE_FROM"
		fi
		if [ "$RSYNC_INCLUDE_PATTERN" != "" ]; then
			RsyncPatternsAdd "$RSYNC_INCLUDE_PATTERN" "include"
		fi
		if [ "$RSYNC_INCLUDE_FROM" != "" ]; then
			RsyncPatternsFromAdd "include" "$RSYNC_INCLUDE_FROM"
		fi
	elif [ "$RSYNC_PATTERN_FIRST" == "include" ]; then
		if [ "$RSYNC_INCLUDE_PATTERN" != "" ]; then
			RsyncPatternsAdd "include" "$RSYNC_INCLUDE_PATTERN"
		fi
		if [ "$RSYNC_INCLUDE_FROM" != "" ]; then
			RsyncPatternsFromAdd "include" "$RSYNC_INCLUDE_FROM"
		fi
		if [ "$RSYNC_EXCLUDE_PATTERN" != "" ]; then
			RsyncPatternsAdd "exclude" "$RSYNC_EXCLUDE_PATTERN"
		fi
		if [ "$RSYNC_EXCLUDE_FROM" != "" ]; then
			RsyncPatternsFromAdd "exclude" "$RSYNC_EXCLUDE_FROM"
		fi
	else
		Logger "Bogus RSYNC_PATTERN_FIRST value in config file. Will not use rsync patterns." "WARN"
	fi
}

function PreInit {

	## SSH compression
	if [ "$SSH_COMPRESSION" != "no" ]; then
		SSH_COMP=-C
	else
		SSH_COMP=
	fi

	## Ignore SSH known host verification
	if [ "$SSH_IGNORE_KNOWN_HOSTS" == "yes" ]; then
		SSH_OPTS="-o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no"
	fi

	## Support for older config files without RSYNC_EXECUTABLE option
	if [ "$RSYNC_EXECUTABLE" == "" ]; then
		RSYNC_EXECUTABLE=rsync
	fi

	## Sudo execution option
	if [ "$SUDO_EXEC" == "yes" ]; then
		if [ "$RSYNC_REMOTE_PATH" != "" ]; then
			RSYNC_PATH="sudo $RSYNC_REMOTE_PATH/$RSYNC_EXECUTABLE"
		else
			RSYNC_PATH="sudo $RSYNC_EXECUTABLE"
		fi
		COMMAND_SUDO="sudo"
	else
		if [ "$RSYNC_REMOTE_PATH" != "" ]; then
			RSYNC_PATH="$RSYNC_REMOTE_PATH/$RSYNC_EXECUTABLE"
		else
			RSYNC_PATH="$RSYNC_EXECUTABLE"
		fi
		COMMAND_SUDO=""
	fi

	 ## Set rsync default arguments
	RSYNC_ARGS="-rltD"
	if [ "$_DRYRUN" -eq 1 ]; then
		RSYNC_DRY_ARG="-n"
		DRY_WARNING="/!\ DRY RUN"
	else
		RSYNC_DRY_ARG=""
	fi

	RSYNC_ATTR_ARGS=""
	if [ "$PRESERVE_PERMISSIONS" != "no" ]; then
		RSYNC_ATTR_ARGS=$RSYNC_ATTR_ARGS" -p"
	fi
	if [ "$PRESERVE_OWNER" != "no" ]; then
		RSYNC_ATTR_ARGS=$RSYNC_ATTR_ARGS" -o"
	fi
	if [ "$PRESERVE_GROUP" != "no" ]; then
		RSYNC_ATTR_ARGS=$RSYNC_ATTR_ARGS" -g"
	fi
	if [ "$PRESERVE_ACL" == "yes" ]; then
		RSYNC_ATTR_ARGS=$RSYNC_ATTR_ARGS" -A"
	fi
	if [ "$PRESERVE_XATTR" == "yes" ]; then
		RSYNC_ATTR_ARGS=$RSYNC_ATTR_ARGS" -X"
	fi
	if [ "$RSYNC_COMPRESS" == "yes" ]; then
		RSYNC_ARGS=$RSYNC_ARGS" -z"
	fi
	if [ "$COPY_SYMLINKS" == "yes" ]; then
		RSYNC_ARGS=$RSYNC_ARGS" -L"
	fi
	if [ "$KEEP_DIRLINKS" == "yes" ]; then
		RSYNC_ARGS=$RSYNC_ARGS" -K"
	fi
	if [ "$PRESERVE_HARDLINKS" == "yes" ]; then
		RSYNC_ARGS=$RSYNC_ARGS" -H"
	fi
	if [ "$CHECKSUM" == "yes" ]; then
		RSYNC_TYPE_ARGS=$RSYNC_TYPE_ARGS" --checksum"
	fi
	if [ "$BANDWIDTH" != "" ] && [ "$BANDWIDTH" != "0" ]; then
		RSYNC_ARGS=$RSYNC_ARGS" --bwlimit=$BANDWIDTH"
	fi

	if [ "$PARTIAL" == "yes" ]; then
		RSYNC_ARGS=$RSYNC_ARGS" --partial --partial-dir=\"$PARTIAL_DIR\""
		RSYNC_PARTIAL_EXCLUDE="--exclude=\"$PARTIAL_DIR\""
	fi

	if [ "$DELTA_COPIES" != "no" ]; then
		RSYNC_ARGS=$RSYNC_ARGS" --no-whole-file"
	else
		RSYNC_ARGS=$RSYNC_ARGS" --whole-file"
	fi

	 ## Set compression executable and extension
	COMPRESSION_LEVEL=3
	if type xz > /dev/null 2>&1
	then
		COMPRESSION_PROGRAM="| xz -$COMPRESSION_LEVEL"
		COMPRESSION_EXTENSION=.xz
	elif type lzma > /dev/null 2>&1
	then
		COMPRESSION_PROGRAM="| lzma -$COMPRESSION_LEVEL"
		COMPRESSION_EXTENSION=.lzma
	elif type pigz > /dev/null 2>&1
	then
		COMPRESSION_PROGRAM="| pigz -$COMPRESSION_LEVEL"
		COMPRESSION_EXTENSION=.gz
		# obackup specific
		COMPRESSION_OPTIONS=--rsyncable
	elif type gzip > /dev/null 2>&1
	then
		COMPRESSION_PROGRAM="| gzip -$COMPRESSION_LEVEL"
		COMPRESSION_EXTENSION=.gz
		# obackup specific
		COMPRESSION_OPTIONS=--rsyncable
	else
		COMPRESSION_PROGRAM=
		COMPRESSION_EXTENSION=
	fi
	ALERT_LOG_FILE="$ALERT_LOG_FILE$COMPRESSION_EXTENSION"
}

function PostInit {

	# Define remote commands
	SSH_CMD="$(type -p ssh) $SSH_COMP -i $SSH_RSA_PRIVATE_KEY $SSH_OPTS $REMOTE_USER@$REMOTE_HOST -p $REMOTE_PORT"
	SCP_CMD="$(type -p scp) $SSH_COMP -i $SSH_RSA_PRIVATE_KEY -P $REMOTE_PORT"
	RSYNC_SSH_CMD="$(type -p ssh) $SSH_COMP -i $SSH_RSA_PRIVATE_KEY $SSH_OPTS -p $REMOTE_PORT"
}

function InitLocalOSSettings {

	## If running under Msys, some commands do not run the same way
	## Using mingw version of find instead of windows one
	## Getting running processes is quite different
	## Ping command is not the same
	if [ "$LOCAL_OS" == "msys" ]; then
		FIND_CMD=$(dirname $BASH)/find
		PING_CMD='$SYSTEMROOT\system32\ping -n 2'
	else
		FIND_CMD=find
		PING_CMD="ping -c 2 -i .2"
	fi

	## Stat command has different syntax on Linux and FreeBSD/MacOSX
	if [ "$LOCAL_OS" == "MacOSX" ] || [ "$LOCAL_OS" == "BSD" ]; then
		STAT_CMD="stat -f \"%Sm\""
		STAT_CTIME_MTIME_CMD="stat -f %N;%c;%m"
	else
		STAT_CMD="stat --format %y"
		STAT_CTIME_MTIME_CMD="stat -c %n;%Z;%Y"
	fi
}

function InitRemoteOSSettings {

	#TODO: fix add -E when both initiator and targets don't run MacOSX and PRESERVE_EXECUTABILITY=yes
	## MacOSX does not use the -E parameter like Linux or BSD does (-E is mapped to extended attrs instead of preserve executability)
	if [ "$PRESERVE_EXECUTABILITY" != "no" ];then
		if [ "$LOCAL_OS" != "MacOSX" ] && [ "$REMOTE_OS" != "MacOSX" ]; then
			RSYNC_ATTR_ARGS=$RSYNC_ATTR_ARGS" -E"
		fi
	fi

	if [ "$REMOTE_OS" == "msys" ]; then
		REMOTE_FIND_CMD=$(dirname $BASH)/find
	else
		REMOTE_FIND_CMD=find
	fi

	## Stat command has different syntax on Linux and FreeBSD/MacOSX
	if [ "$LOCAL_OS" == "MacOSX" ] || [ "$LOCAL_OS" == "BSD" ]; then
		REMOTE_STAT_CMD="stat -f \"%Sm\""
		REMOTE_STAT_CTIME_MTIME_CMD="stat -f \\\"%N;%c;%m\\\""
	else
		REMOTE_STAT_CMD="stat --format %y"
		REMOTE_STAT_CTIME_MTIME_CMD="stat -c \\\"%n;%Z;%Y\\\""
	fi

}

## IFS debug function
function PrintIFS {
	printf "IFS is: %q" "$IFS"
}

## END Generic functions
_LOGGER_PREFIX="time"

## Working directory. This directory exists in any replica and contains state files, backups, soft deleted files etc
OSYNC_DIR=".osync_workdir"

function TrapStop {
	if [ $SOFT_STOP -eq 0 ]; then
		Logger " /!\ WARNING: Manual exit of osync is really not recommended. Sync will be in inconsistent state." "WARN"
		Logger " /!\ WARNING: If you are sure, please hit CTRL+C another time to quit." "WARN"
		SOFT_STOP=1
		return 1
	fi

	if [ $SOFT_STOP -eq 1 ]; then
		Logger " /!\ WARNING: CTRL+C hit twice. Exiting osync. Please wait while replicas get unlocked..." "WARN"
		SOFT_STOP=2
		exit 2
	fi
}

function TrapQuit {
	local exitcode

	if [ $ERROR_ALERT -ne 0 ]; then
		UnlockReplicas
		if [ "$_DEBUG" != "yes" ]
		then
			SendAlert
		else
			Logger "Debug mode, no alert mail will be sent." "NOTICE"
		fi
		if [ "$RUN_AFTER_CMD_ON_ERROR" == "yes" ]; then
			RunAfterHook
		fi
		CleanUp
		Logger "$PROGRAM finished with errors." "ERROR"
		exitcode=1
	elif [ $WARN_ALERT -ne 0 ]; then
		UnlockReplicas
		if [ "$_DEBUG" != "yes" ]
		then
			SendAlert
		else
			Logger "Debug mode, no alert mail will be sent." "NOTICE"
		fi
		if [ "$RUN_AFTER_CMD_ON_ERROR" == "yes" ]; then
			RunAfterHook
		fi
		CleanUp
		Logger "$PROGRAM finished with warnings." "WARN"
		exitcode=2	# Warning exit code must not force daemon mode to quit
	else
		UnlockReplicas
		RunAfterHook
		CleanUp
		Logger "$PROGRAM finished." "NOTICE"
		exitcode=0
	fi

	KillChilds $$ > /dev/null 2>&1

	exit $exitcode
}

function CheckEnvironment {

	if [ "$REMOTE_OPERATION" == "yes" ]; then
		if ! type ssh > /dev/null 2>&1 ; then
			Logger "ssh not present. Cannot start sync." "CRITICAL"
			exit 1
		fi
	fi

	if ! type rsync > /dev/null 2>&1 ; then
		Logger "rsync not present. Sync cannot start." "CRITICAL"
		exit 1
	fi
}

function CheckCurrentConfig {

	if [ "$INSTANCE_ID" == "" ]; then
		Logger "No INSTANCE_ID defined in config file." "CRITICAL"
		exit 1
	fi

	if [ "$INITIATOR_SYNC_DIR" == "" ]; then
		Logger "No INITIATOR_SYNC_DIR set in config file." "CRITICAL"
		exit 1
	fi

	if [ "$TARGET_SYNC_DIR" == "" ]; then
		Logger "Not TARGET_SYNC_DIR set in config file." "CRITICAL"
		exit 1
	fi

	# Check all variables that should contain "yes" or "no"
	declare -a yes_no_vars=(CREATE_DIRS SUDO_EXEC SSH_COMPRESSION SSH_IGNORE_KNOWN_HOSTS REMOTE_HOST_PING PRESERVE_PERMISSIONS PRESERVE_OWNER PRESERVE_GROUP PRESERVE_EXECUTABILITY PRESERVE_ACL PRESERVE_XATTR COPY_SYMLINKS KEEP_DIRLINKS PRESERVE_HARDLINKS CHECKSUM RSYNC_COMPRESS CONFLICT_BACKUP CONFLICT_BACKUP_MULTIPLE SOFT_DELETE RESUME_SYNC FORCE_STRANGER_LOCK_RESUME PARTIAL DELTA_COPIES STOP_ON_CMD_ERROR RUN_AFTER_CMD_ON_ERROR)
	for i in "${yes_no_vars[@]}"; do
		test="if [ \"\$$i\" != \"yes\" ] && [ \"\$$i\" != \"no\" ]; then Logger \"Bogus $i value defined in config file. Correct your config file or update it using the update script if using and old version.\" \"CRITICAL\"; exit 1; fi"
		eval "$test"
	done

	# Check all variables that should contain a numerical value >= 0
	declare -a num_vars=(MINIMUM_SPACE BANDWIDTH SOFT_MAX_EXEC_TIME HARD_MAX_EXEC_TIME KEEP_LOGGING MIN_WAIT MAX_WAIT CONFLICT_BACKUP_DAYS SOFT_DELETE_DAYS RESUME_TRY MAX_EXEC_TIME_PER_CMD_BEFORE MAX_EXEC_TIME_PER_CMD_AFTER)
	for i in "${num_vars[@]}"; do
		test="if [ $(IsNumeric \"\$$i\") -eq 0 ]; then Logger \"Bogus $i value defined in config file. Correct your config file or update it using the update script if using and old version.\" \"CRITICAL\"; exit 1; fi"
		eval "$test"
	done

	#TODO(low): Add runtime variable tests (RSYNC_ARGS etc)
}

###### Osync specific functions (non shared)

function _CheckReplicaPathsLocal {
	local replica_path="${1}"

	if [ ! -w "$replica_path" ]; then
		Logger "Local replica path [$replica_path] is not writable." "CRITICAL"
		exit 1
	fi

	if [ ! -d "$replica_path" ]; then
		if [ "$CREATE_DIRS" == "yes" ]; then
			$COMMAND_SUDO mkdir -p "$replica_path" >> "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID" 2>&1
			if [ $? != 0 ]; then
				Logger "Cannot create local replica path [$replica_path]." "CRITICAL"
				Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)"
				exit 1
			else
				Logger "Created local replica path [$replica_path]." "NOTICE"
			fi
		else
			Logger "Local replica path [$replica_path] does not exist." "CRITICAL"
			exit 1
		fi
	fi
}

function _CheckReplicaPathsRemote {
	local replica_path="${1}"

	local cmd

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "if [ ! -w \"'$replica_path'\" ];then exit 1; fi" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd"
	if [ $? != 0 ]; then
		Logger "Remote replica path [$replica_path] is not writable." "CRITICAL"
		exit 1
	fi

	cmd=$SSH_CMD' "if ! [ -d \"'$replica_path'\" ]; then if [ \"'$CREATE_DIRS'\" == \"yes\" ]; then '$COMMAND_SUDO' mkdir -p \"'$replica_path'\"; fi; fi" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd"
	if [ $? != 0 ]; then
		Logger "Cannot create remote replica path [$replica_path]." "CRITICAL"
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "ERROR"
		exit 1
	fi
}

function CheckReplicaPaths {

	local pids

	# Use direct comparaison before having a portable realpath implementation
	#INITIATOR_SYNC_DIR_CANN=$(realpath "${INITIATOR[1]}")	#TODO(verylow): investigate realpath & readlink issues on MSYS and busybox here
	#TARGET_SYNC_DIR_CANN=$(realpath "${TARGET[1]})

	if [ "$REMOTE_OPERATION" != "yes" ]; then
		if [ "${INITIATOR[1]}" == "${TARGET[1]}" ]; then
			Logger "Initiator and target path [${INITIATOR[1]}] cannot be the same." "CRITICAL"
			exit 1
		fi
	fi

	_CheckReplicaPathsLocal "${INITIATOR[1]}" &
	pids="$!"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_CheckReplicaPathsLocal "${TARGET[1]}" &
		pids="$pids;$!"
	else
		_CheckReplicaPathsRemote "${TARGET[1]}" &
		pids="$pids;$!"
	fi
	WaitForTaskCompletion $pids 720 1800 ${FUNCNAME[0]} false $KEEP_LOGGING
	if [ $? -ne 0 ]; then
		Logger "Cancelling task." "CRITICAL"
		exit 1
	fi
}

function _CheckDiskSpaceLocal {
	local replica_path="${1}"

	local disk_space

	Logger "Checking minimum disk space in [$replica_path]." "NOTICE"

	disk_space=$(df -P "$replica_path" | tail -1 | awk '{print $4}')
	if [ $disk_space -lt $MINIMUM_SPACE ]; then
		Logger "There is not enough free space on replica [$replica_path] ($disk_space KB)." "WARN"
	fi
}

function _CheckDiskSpaceRemote {
	local replica_path="${1}"

	Logger "Checking minimum disk space on target [$replica_path]." "NOTICE"

	local cmd
	local disk_space

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "'$COMMAND_SUDO' df -P \"'$replica_path'\"" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd"
	if [ $? != 0 ]; then
		Logger "Cannot get free space on target [$replica_path]." "ERROR"
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
	else
		disk_space=$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID | tail -1 | awk '{print $4}')
		if [ $disk_space -lt $MINIMUM_SPACE ]; then
			Logger "There is not enough free space on replica [$replica_path] ($disk_space KB)." "WARN"
		fi
	fi
}

function CheckDiskSpace {

	local pids

	if [ $MINIMUM_SPACE -eq 0 ]; then
		Logger "Skipped minimum space check." "NOTICE"
		return 0
	fi

	_CheckDiskSpaceLocal "${INITIATOR[1]}" &
	pids="$!"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_CheckDiskSpaceLocal "${TARGET[1]}" &
		pids="$pids;$!"
	else
		_CheckDiskSpaceRemote "${TARGET[1]}" &
		pids="$pids;$!"
	fi
	WaitForTaskCompletion $pids 720 1800 ${FUNCNAME[0]} true $KEEP_LOGGING
}


function _CreateStateDirsLocal {
	local replica_state_dir="${1}"

	if ! [ -d "$replica_state_dir" ]; then
		$COMMAND_SUDO mkdir -p "$replica_state_dir" >> "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID" 2>&1
		if [ $? != 0 ]; then
			Logger "Cannot create state dir [$replica_state_dir]." "CRITICAL"
			Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "ERROR"
			exit 1
		fi
	fi
}

function _CreateStateDirsRemote {
	local replica_state_dir="${1}"

	local cmd

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "if ! [ -d \"'$replica_state_dir'\" ]; then '$COMMAND_SUDO' mkdir -p \"'$replica_state_dir'\"; fi" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd"
	if [ $? != 0 ]; then
		Logger "Cannot create remote state dir [$replica_state_dir]." "CRITICAL"
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "ERROR"
		exit 1
	fi
}

function CreateStateDirs {

	local pids

	_CreateStateDirsLocal "${INITIATOR[1]}${INITIATOR[3]}" &
	pids="$!"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_CreateStateDirsLocal "${TARGET[1]}${TARGET[3]}" &
		pids="$pids;$!"
	else
		_CreateStateDirsRemote "${TARGET[1]}${TARGET[3]}" &
		pids="$pids;$!"
	fi
	WaitForTaskCompletion $pids 720 1800 ${FUNCNAME[0]} true $KEEP_LOGGING
	if [ $? -ne 0 ]; then
		Logger "Cancelling task." "CRITICAL"
		exit 1
	fi
}

function _CheckLocksLocal {
	local lockfile="${1}"

	local lockfile_content
	local lock_pid
	local lock_instance_id

	if [ -f "$lockfile" ]; then
		lockfile_content=$(cat $lockfile)
		Logger "Master lock pid present: $lockfile_content" "DEBUG"
		lock_pid=${lockfile_content%@*}
		lock_instance_id=${lockfile_content#*@}
		kill -9 $lock_pid > /dev/null 2>&1
		if [ $? != 0 ]; then
			Logger "There is a dead osync lock in [$lockfile]. Instance [$lock_pid] no longer running. Resuming." "NOTICE"
		else
			Logger "There is already a local instance of osync running [$lock_pid] for this replica. Cannot start." "CRITICAL"
			exit 1
		fi
	fi
}

function _CheckLocksRemote {
	local lockfile="${1}"

	local cmd
	local lock_pid
	local lock_instance_id
	local lockfile_content

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "if [ -f \"'$lockfile'\" ]; then cat \"'$lockfile'\"; fi" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'"'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd"
	if [ $? != 0 ]; then
		if [ -f "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID" ]; then
			lockfile_content=$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)
		else
			Logger "Cannot get remote lockfile." "CRITICAL"
			exit 1
		fi
	fi

	lock_pid=${lockfile_content%@*}
	lock_instance_id=${lockfile_content#*@}

	if [ "$lock_pid" != "" ] && [ "$lock_instance_id" != "" ]; then
		Logger "Remote lock is: $lock_pid@$lock_instance_id" "DEBUG"

		kill -0 $lock_pid > /dev/null 2>&1
		if [ $? != 0 ]; then
			if [ "$lock_instance_id" == "$INSTANCE_ID" ]; then
				Logger "There is a dead osync lock on target replica that corresponds to this initiator sync id [$lock_instance_id]. Instance [$lock_pid] no longer running. Resuming." "NOTICE"
			else
				if [ "$FORCE_STRANGER_LOCK_RESUME" == "yes" ]; then
					Logger "WARNING: There is a dead osync lock on target replica that does not correspond to this initiator sync-id [$lock_instance_id]. Forcing resume." "WARN"
				else
					Logger "There is a dead osync lock on target replica that does not correspond to this initiator sync-id [$lock_instance_id]. Will not resume." "CRITICAL"
					exit 1
				fi
			fi
		else
			Logger "There is already a local instance of osync that locks target replica [$lock_pid@$lock_instance_id]. Cannot start." "CRITICAL"
			exit 1
		fi
	fi
}

function CheckLocks {

	local pids

	if [ $_NOLOCKS -eq 1 ]; then
		return 0
	fi

	# Do not bother checking for locks when FORCE_UNLOCK is set
	if [ $FORCE_UNLOCK -eq 1 ]; then
		WriteLockFiles
		if [ $? != 0 ]; then
			exit 1
		fi
	fi

	_CheckLocksLocal "${INITIATOR[2]}" &
	pids="$!"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_CheckLocksLocal "${TARGET[2]}" &
		pids="$pids;$!"
	else
		_CheckLocksRemote "${TARGET[2]}" &
		pids="$pids;$!"
	fi
	WaitForTaskCompletion $pids 720 1800 ${FUNCNAME[0]} true $KEEP_LOGGING
	if [ $? -ne 0 ]; then
		Logger "Cancelling task." "CRITICAL"
		exit 1
	fi
	WriteLockFiles
}

function _WriteLockFilesLocal {
	local lockfile="${1}"

	$COMMAND_SUDO echo "$SCRIPT_PID@$INSTANCE_ID" > "$lockfile"
	if [ $?	!= 0 ]; then
		Logger "Could not create lock file [$lockfile]." "CRITICAL"
		exit 1
	else
		Logger "Locked replica on [$lockfile]." "DEBUG"
	fi
}

function _WriteLockFilesRemote {
	local lockfile="${1}"

	local cmd=

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "echo '$SCRIPT_PID@$INSTANCE_ID' | '$COMMAND_SUDO' tee \"'$lockfile'\"" > /dev/null 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd"
	if [ $? != 0 ]; then
		Logger "Could not set lock on remote $replica_type replica." "CRITICAL"
		exit 1
	else
		Logger "Locked remote $replica_type replica." "DEBUG"
	fi
}

function WriteLockFiles {

	local pids

	_WriteLockFilesLocal "${INITIATOR[2]}" &
	pids="$!"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_WriteLockFilesLocal "${TARGET[2]}" &
		pids="$pids;$!"
	else
		_WriteLockFilesRemote "${TARGET[2]}" &
		pids="$pids;$!"
	fi
	WaitForTaskCompletion $pids 720 1800 ${FUNCNAME[0]} true $KEEP_LOGGING
	if [ $? -ne 0 ]; then
		Logger "Cancelling task." "CRITICAL"
		exit 1
	fi
	LOCK_FILES_EXIST=1
}

function _UnlockReplicasLocal {
	local lockfile="${1}"

	if [ -f "$lockfile" ]; then
		$COMMAND_SUDO rm "$lockfile"
		if [ $? != 0 ]; then
			Logger "Could not unlock local replica." "ERROR"
		else
			Logger "Removed local replica lock." "DEBUG"
		fi
	fi
}

function _UnlockReplicasRemote {
	local lockfile="${1}"

	local cmd=

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "if [ -f \"'$lockfile'\" ]; then '$COMMAND_SUDO' rm -f \"'$lockfile'\"; fi" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd"
	if [ $? != 0 ]; then
		Logger "Could not unlock remote replica." "ERROR"
		Logger "Command Output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
	else
		Logger "Removed remote replica lock." "DEBUG"
	fi
}

function UnlockReplicas {

	local pids

	if [ $_NOLOCKS -eq 1 ] || [ $LOCK_FILES_EXIST -eq 0 ]; then
		return 0
	fi

	_UnlockReplicasLocal "${INITIATOR[2]}" &
	pids="$!"

	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_UnlockReplicasLocal "${TARGET[2]}" &
		pids="$pids;$!"
	else
		_UnlockReplicasRemote "${TARGET[2]}" &
		pids="$pids;$!"
	fi
	WaitForTaskCompletion $pids 720 1800 ${FUNCNAME[0]} true $KEEP_LOGGING
}

###### Sync core functions

	## Rsync does not like spaces in directory names, considering it as two different directories. Handling this schema by escaping space.
	## It seems this only happens when trying to execute an rsync command through weval $rsync_cmd on a remote host.
	## So I am using unescaped $INITIATOR_SYNC_DIR for local rsync calls and escaped $ESC_INITIATOR_SYNC_DIR for remote rsync calls like user@host:$ESC_INITIATOR_SYNC_DIR
	## The same applies for target sync dir..............................................T.H.I.S..I.S..A..P.R.O.G.R.A.M.M.I.N.G..N.I.G.H.T.M.A.R.E

function tree_list {
	local replica_path="${1}" # path to the replica for which a tree needs to be constructed
	local replica_type="${2}" # replica type: initiator, target
	local tree_filename="${3}" # filename to output tree (will be prefixed with $replica_type)

	local escaped_replica_path
	local rsync_cmd


	#WIP
	#if [ "$replica_type" == "${INITIATOR[0]}" ]; then
	#	exit 12
	#fi

	escaped_replica_path=$(EscapeSpaces "$replica_path")

	Logger "Creating $replica_type replica file list [$replica_path]." "NOTICE"
	if [ "$REMOTE_OPERATION" == "yes" ] && [ "$replica_type" == "${TARGET[0]}" ]; then
		CheckConnectivity3rdPartyHosts
		CheckConnectivityRemoteHost
		rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $RSYNC_ARGS $RSYNC_ATTR_ARGS $RSYNC_TYPE_ARGS -8 --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE -e \"$RSYNC_SSH_CMD\" --list-only $REMOTE_USER@$REMOTE_HOST:\"$escaped_replica_path/\" | grep \"^-\|^d\" | awk '{\$1=\$2=\$3=\$4=\"\" ;print}' | awk '{\$1=\$1 ;print}' | (grep -v \"^\.$\" || :) | sort > \"$RUN_DIR/$PROGRAM.$replica_type.$SCRIPT_PID\""
	else
		rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $RSYNC_ARGS $RSYNC_ATTR_ARGS $RSYNC_TYPE_ARGS -8 --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --list-only \"$replica_path/\" | grep \"^-\|^d\" | awk '{\$1=\$2=\$3=\$4=\"\" ;print}' | awk '{\$1=\$1 ;print}' | (grep -v \"^\.$\" || :) | sort > \"$RUN_DIR/$PROGRAM.$replica_type.$SCRIPT_PID\""
	fi
	Logger "RSYNC_CMD: $rsync_cmd" "DEBUG"
	## Redirect commands stderr here to get rsync stderr output in logfile with eval "$rsync_cmd" 2>> "$LOG_FILE"
	## When log writing fails, $! is empty and WaitForTaskCompletion fails.  Removing the 2>> log
	eval "$rsync_cmd"
	retval=$?
	## Retval 24 = some files vanished while creating list
	if ([ $retval == 0 ] || [ $retval == 24 ]) && [ -f "$RUN_DIR/$PROGRAM.$replica_type.$SCRIPT_PID" ]; then
		mv -f "$RUN_DIR/$PROGRAM.$replica_type.$SCRIPT_PID" "${INITIATOR[1]}${INITIATOR[3]}/$replica_type$tree_filename"
		return $?
	else
		Logger "Cannot create replica file list in [$replica_path]." "CRITICAL"
		return $retval
	fi
}

# delete_list(replica, tree-file-after, tree-file-current, deleted-list-file, deleted-failed-list-file): Creates a list of files vanished from last run on replica $1 (initiator/target)
function delete_list {
	local replica_type="${1}" # replica type: initiator, target
	local tree_file_after="${2}" # tree-file-after, will be prefixed with replica type
	local tree_file_current="${3}" # tree-file-current, will be prefixed with replica type
	local deleted_list_file="${4}" # file containing deleted file list, will be prefixed with replica type
	local deleted_failed_list_file="${5}" # file containing files that could not be deleted on last run, will be prefixed with replica type

	local cmd

	Logger "Creating $replica_type replica deleted file list." "NOTICE"
	if [ -f "${INITIATOR[1]}${INITIATOR[3]}/$replica_type$TREE_AFTER_FILENAME_NO_SUFFIX" ]; then
		## Same functionnality, comm is much faster than grep but is not available on every platform
		if type comm > /dev/null 2>&1 ; then
			cmd="comm -23 \"${INITIATOR[1]}${INITIATOR[3]}/$replica_type$TREE_AFTER_FILENAME_NO_SUFFIX\" \"${INITIATOR[1]}${INITIATOR[3]}/$replica_type$tree_file_current\" > \"${INITIATOR[1]}${INITIATOR[3]}/$replica_type$deleted_list_file\""
		else
			## The || : forces the command to have a good result
			cmd="(grep -F -x -v -f \"${INITIATOR[1]}${INITIATOR[3]}/$replica_type$tree_file_current\" \"${INITIATOR[1]}${INITIATOR[3]}/$replica_type$TREE_AFTER_FILENAME_NO_SUFFIX\" || :) > \"${INITIATOR[1]}${INITIATOR[3]}/$replica_type$deleted_list_file\""
		fi

		Logger "CMD: $cmd" "DEBUG"
		eval "$cmd" 2>> "$LOG_FILE"
		retval=$?

		# Add delete failed file list to current delete list and then empty it
		if [ -f "${INITIATOR[1]}${INITIATOR[3]}/$replica_type$deleted_failed_list_file" ]; then
			cat "${INITIATOR[1]}${INITIATOR[3]}/$replica_type$deleted_failed_list_file" >> "${INITIATOR[1]}${INITIATOR[3]}/$replica_type$deleted_list_file"
			rm -f "${INITIATOR[1]}${INITIATOR[3]}/$replica_type$deleted_failed_list_file"
		fi

		return $retval
	else
		touch "${INITIATOR[1]}${INITIATOR[3]}/$replica_type$deleted_list_file"
		return $retval
	fi
}

function _get_file_ctime_mtime_local {
	local replica_path="${1}" # Contains replica path
	local replica_type="${2}" # Initiator / Target
	local file_list="${3}" # Contains list of files to get time attrs

	echo -n "" > "$RUN_DIR/$PROGRAM.ctime_mtime.$replica_type.$SCRIPT_PID"
	while read -r file; do $STAT_CTIME_MTIME_CMD "$replica_path$file" | sort >> "$RUN_DIR/$PROGRAM.ctime_mtime.$replica_type.$SCRIPT_PID"; done < "$file_list"
}

function _get_file_ctime_mtime_remote {
	local replica_path="${1}" # Contains replica path
	local replica_type="${2}"
	local file_list="${3}"

	local cmd

	cmd='cat "'$file_list'" | '$SSH_CMD' "while read -r file; do '$REMOTE_STAT_CTIME_MTIME_CMD' \"'$replica_path'\$file\"; done | sort" > "'$RUN_DIR/$PROGRAM.ctime_mtime.$replica_type.$SCRIPT_PID'"'
	Logger "CMD: $cmd" "DEBUG"
	eval "$cmd"
	if [ $? != 0 ]; then
		Logger "Getting file attributes failed [$retval] on $replica_type. Stopping execution." "CRITICAL"
		if [ $_VERBOSE -eq 0 ] && [ -f "$RUN_DIR/$PROGRAM.ctime_mtime.$replica_type.$SCRIPT_PID" ]; then
			Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.ctime_mtime.$replica_type.$SCRIPT_PID)" "NOTICE"
		fi
		exit 1
	fi
}

# rsync does sync with mtime, but file attribute modifications only change ctime.
# Hence, detect newer ctime on the replica that gets updated first with CONFLICT_PREVALANCE and update all newer file attributes on this replica before real update
function sync_attrs {
	local initiator_replica="${1}"
	local target_replica="${2}"
	local delete_list_filename="$DELETED_LIST_FILENAME" # Contains deleted list filename, will be prefixed with replica type

	local rsync_cmd
	local retval

	Logger "Getting list of files that need updates." "NOTICE"

	if [ "$REMOTE_OPERATION" == "yes" ]; then
		CheckConnectivity3rdPartyHosts
		CheckConnectivityRemoteHost
		rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" -i -n -8 $RSYNC_ARGS $RSYNC_ATTR_ARGS $RSYNC_PARTIAL_EXCLUDE -e \"$RSYNC_SSH_CMD\" --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE \"$initiator_replica\" $REMOTE_USER@$REMOTE_HOST:\"$target_replica\" >> $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID 2>&1 &"
	else
		rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" -i -n -8 $RSYNC_ARGS $RSYNC_ATTR_ARGS $RSYNC_PARTIAL_EXCLUDE --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE \"$initiator_replica\" \"$target_replica\" >> $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID 2>&1 &"
	fi
	Logger "RSYNC_CMD: $rsync_cmd" "DEBUG"
	eval "$rsync_cmd"
	WaitForTaskCompletion $! $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME ${FUNCNAME[0]} false $KEEP_LOGGING
	#WIP: return retval from process instead of err count if only one pid is tested
	retval=$?
	if [ $_VERBOSE -eq 1 ] && [ -f "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID" ]; then
		Logger "List:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
	fi

	if [ $retval != 0 ] && [ $retval != 24 ]; then
		Logger "Getting list of files that need updates failed [$retval]. Stopping execution." "CRITICAL"
		if [ $_VERBOSE -eq 0 ] && [ -f "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID" ]; then
			Logger "Rsync output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
		fi
		exit 1 #WIP: check why exit $retval was used
	else
		cat "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID" | ( grep -Ev "^[^ ]*(c|s|t)[^ ]* " || :) | ( grep -E "^[^ ]*(p|o|g|a)[^ ]* " || :) | sed -e 's/^[^ ]* //' >> "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}-cleaned.$SCRIPT_PID"
		if [ $? != 0 ]; then
			Logger "Cannot prepare file list for attribute sync." "CRITICAL"
			exit 1
		fi
	fi

	Logger "Getting ctimes for pending files on initiator." "NOTICE"
	_get_file_ctime_mtime_local "${INITIATOR[1]}" "${INITIATOR[0]}" "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}-cleaned.$SCRIPT_PID" &
	pids="$!"

	Logger "Getting ctimes for pending files on target." "NOTICE"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_get_file_ctime_mtime_local "${TARGET[1]}" "${TARGET[0]}" "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}-cleaned.$SCRIPT_PID" &
		pids="$pids;$!"
	else
		_get_file_ctime_mtime_remote "${TARGET[1]}" "${TARGET[0]}" "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}-cleaned.$SCRIPT_PID" &
		pids="$pids;$!"
	fi
	WaitForTaskCompletion $pids 1800 0 ${FUNCNAME[0]} true $KEEP_LOGGING

	# If target gets updated first, then sync_attr must update initiator's attrs first
	# For join, remove leading replica paths

	sed -i'.tmp' "s;^${INITIATOR[1]};;g" "$RUN_DIR/$PROGRAM.ctime_mtime.${INITIATOR[0]}.$SCRIPT_PID"
	sed -i'.tmp' "s;^${TARGET[1]};;g" "$RUN_DIR/$PROGRAM.ctime_mtime.${TARGET[0]}.$SCRIPT_PID"

	if [ "$CONFLICT_PREVALANCE" == "${TARGET[0]}" ]; then
		local source_dir="${INITIATOR[1]}"
		local esc_source_dir=$(EscapeSpaces "${INITIATOR[1]}")
		local dest_dir="${TARGET[1]}"
		local esc_dest_dir=$(EscapeSpaces "${TARGET[1]}")
		local dest_replica="${TARGET[0]}"
		join -j 1 -t ';' -o 1.1,1.2,2.2 "$RUN_DIR/$PROGRAM.ctime_mtime.${INITIATOR[0]}.$SCRIPT_PID" "$RUN_DIR/$PROGRAM.ctime_mtime.${TARGET[0]}.$SCRIPT_PID" | awk -F';' '{if ($2 > $3) print $1}' > "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}-ctime_files.$SCRIPT_PID"
	else
		local source_dir="${TARGET[1]}"
		local esc_source_dir=$(EscapeSpaces "${TARGET[1]}")
		local dest_dir="${INITIATOR[1]}"
		local esc_dest_dir=$(EscapeSpaces "${INITIATOR[1]}")
		local dest_replica="${INITIATOR[0]}"
		join -j 1 -t ';' -o 1.1,1.2,2.2 "$RUN_DIR/$PROGRAM.ctime_mtime.${TARGET[0]}.$SCRIPT_PID" "$RUN_DIR/$PROGRAM.ctime_mtime.${INITIATOR[0]}.$SCRIPT_PID" | awk -F';' '{if ($2 > $3) print $1}' > "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}-ctime_files.$SCRIPT_PID"
	fi

	if [ $(wc -l < "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}-ctime_files.$SCRIPT_PID") -eq 0 ]; then
		Logger "Updating file attributes on $dest_replica not required" "NOTICE"
		return 0
	fi

	Logger "Updating file attributes on $dest_replica." "NOTICE"

	if [ "$REMOTE_OPERATION" == "yes" ]; then
		CheckConnectivity3rdPartyHosts
		CheckConnectivityRemoteHost

		# No rsync args (hence no -r) because files are selected with --from-file
		if [ "$dest_replica" == "${INITIATOR[0]}" ]; then
			rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $RSYNC_DRY_ARG $RSYNC_ATTR_ARGS $SYNC_OPTS -e \"$RSYNC_SSH_CMD\" --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/${INITIATOR[0]}$delete_list_filename\" --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/${TARGET[0]}$delete_list_filename\" --files-from=\"$RUN_DIR/$PROGRAM.${FUNCNAME[0]}-ctime_files.$SCRIPT_PID\" $REMOTE_USER@$REMOTE_HOST:\"$esc_source_dir\" \"$dest_dir\" >> $RUN_DIR/$PROGRAM.attr-update.$dest_replica.$SCRIPT_PID 2>&1 &"
		else
			rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $RSYNC_DRY_ARG $RSYNC_ATTR_ARGS $SYNC_OPTS -e \"$RSYNC_SSH_CMD\" --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/${INITIATOR[0]}$delete_list_filename\" --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/${TARGET[0]}$delete_list_filename\" --files-from=\"$RUN_DIR/$PROGRAM.${FUNCNAME[0]}-ctime_files.$SCRIPT_PID\" \"$source_dir\" $REMOTE_USER@$REMOTE_HOST:\"$esc_dest_dir\" >> $RUN_DIR/$PROGRAM.attr-update.$dest_replica.$SCRIPT_PID 2>&1 &"
		fi
	else
		rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $RSYNC_DRY_ARG $RSYNC_ATTR_ARGS $SYNC_OPTS --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/${INITIATOR[0]}$delete_list_filename\" --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/${TARGET[0]}$delete_list_filename\" --files-from=\"$RUN_DIR/$PROGRAM.${FUNCNAME[0]}-ctime_files.$SCRIPT_PID\" \"$source_dir\" \"$dest_dir\" >> $RUN_DIR/$PROGRAM.attr-update.$dest_replica.$SCRIPT_PID 2>&1 &"

	fi

	Logger "RSYNC_CMD: $rsync_cmd" "DEBUG"
	eval "$rsync_cmd"
	WaitForTaskCompletion $! $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME ${FUNCNAME[0]} false $KEEP_LOGGING
	#WIP: the same
	retval=$?
	if [ $_VERBOSE -eq 1 ] && [ -f "$RUN_DIR/$PROGRAM.attr-update.$dest_replica.$SCRIPT_PID" ]; then
		Logger "List:\n$(cat $RUN_DIR/$PROGRAM.attr-update.$dest_replica.$SCRIPT_PID)" "NOTICE"
	fi

	if [ $retval != 0 ] && [ $retval != 24 ]; then
		Logger "Updating file attributes on $dest_replica [$retval]. Stopping execution." "CRITICAL"
		if [ $_VERBOSE -eq 0 ] && [ -f "$RUN_DIR/$PROGRAM.attr-update.$dest_replica.$SCRIPT_PID" ]; then
			Logger "Rsync output:\n$(cat $RUN_DIR/$PROGRAM.attr-update.$dest_replica.$SCRIPT_PID)" "NOTICE"
		fi
		exit 1 #WIP check why exit $retval was used
	else
		Logger "Successfully updated file attributes on $dest_replica replica." "NOTICE"
	fi
}

# sync_update(source replica, destination replica, delete_list_filename)
function sync_update {
	local source_replica="${1}" # Contains replica type of source: initiator, target
	local destination_replica="${2}" # Contains replica type of destination: initiator, target
	local delete_list_filename="${3}" # Contains deleted list filename, will be prefixed with replica type

	local rsync_cmd
	local retval

	Logger "Updating $destination_replica replica." "NOTICE"
	if [ "$source_replica" == "${INITIATOR[0]}" ]; then
		local source_dir="${INITIATOR[1]}"
		local esc_source_dir=$(EscapeSpaces "${INITIATOR[1]}")
		local dest_dir="${TARGET[1]}"
		local esc_dest_dir=$(EscapeSpaces "${TARGET[1]}")
		local backup_args="$TARGET_BACKUP"
	else
		local source_dir="${TARGET[1]}"
		local esc_source_dir=$(EscapeSpaces "${TARGET[1]}")
		local dest_dir="${INITIATOR[1]}"
		local esc_dest_dir=$(EscapeSpaces "${INITIATOR[1]}")
		local backup_args="$INITIATOR_BACKUP"
	fi

	if [ "$REMOTE_OPERATION" == "yes" ]; then
		CheckConnectivity3rdPartyHosts
		CheckConnectivityRemoteHost
		if [ "$source_replica" == "${INITIATOR[0]}" ]; then
			rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $RSYNC_ARGS $RSYNC_DRY_ARG $RSYNC_ATTR_ARGS $RSYNC_TYPE_ARGS $SYNC_OPTS -e \"$RSYNC_SSH_CMD\" $backup_args --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/$source_replica$delete_list_filename\" --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/$destination_replica$delete_list_filename\" \"$source_dir\" $REMOTE_USER@$REMOTE_HOST:\"$esc_dest_dir\" >> $RUN_DIR/$PROGRAM.update.$destination_replica.$SCRIPT_PID 2>&1"
		else
			rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $RSYNC_ARGS $RSYNC_DRY_ARG $RSYNC_ATTR_ARGS $RSYNC_TYPE_ARGS $SYNC_OPTS -e \"$RSYNC_SSH_CMD\" $backup_args --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/$destination_replica$delete_list_filename\" --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/$source_replica$delete_list_filename\" $REMOTE_USER@$REMOTE_HOST:\"$esc_source_dir\" \"$dest_dir\" >> $RUN_DIR/$PROGRAM.update.$destination_replica.$SCRIPT_PID 2>&1"
		fi
	else
		rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $RSYNC_ARGS $RSYNC_DRY_ARG $RSYNC_ATTR_ARGS $RSYNC_TYPE_ARGS $SYNC_OPTS $backup_args --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/$source_replica$delete_list_filename\" --exclude-from=\"${INITIATOR[1]}${INITIATOR[3]}/$destination_replica$delete_list_filename\" \"$source_dir\" \"$dest_dir\" >> $RUN_DIR/$PROGRAM.update.$destination_replica.$SCRIPT_PID 2>&1"
	fi
	Logger "RSYNC_CMD: $rsync_cmd" "DEBUG"
	eval "$rsync_cmd"
	retval=$?
	if [ $_VERBOSE -eq 1 ] && [ -f "$RUN_DIR/$PROGRAM.update.$destination_replica.$SCRIPT_PID" ]; then
		Logger "List:\n$(cat $RUN_DIR/$PROGRAM.update.$destination_replica.$SCRIPT_PID)" "NOTICE"
	fi

	if [ $retval != 0 ] && [ $retval != 24 ]; then
		Logger "Updating $destination_replica replica failed. Stopping execution." "CRITICAL"
		if [ $_VERBOSE -eq 0 ] && [ -f "$RUN_DIR/$PROGRAM.update.$destination_replica.$SCRIPT_PID" ]; then
			Logger "Rsync output:\n$(cat $RUN_DIR/$PROGRAM.update.$destination_replica.$SCRIPT_PID)" "NOTICE"
		fi
		exit 1 #WIP exit $retval
	else
		Logger "Updating $destination_replica replica succeded." "NOTICE"
		return 0
	fi
}

# delete_local(replica dir, delete file list, delete dir, delete failed file)
function _delete_local {
	local replica_dir="${1}" # Full path to replica
	local deleted_list_file="${2}" # file containing deleted file list, will be prefixed with replica type
	local deletion_dir="${3}" # deletion dir in format .[workdir]/deleted
	local deleted_failed_list_file="${4}" # file containing files that could not be deleted on last run, will be prefixed with replica type

	local parentdir
	local previous_file=""

	if [ -d "$replica_dir$deletion_dir" ] && [ $_DRYRUN -ne 1 ]; then
		$COMMAND_SUDO mkdir -p "$replica_dir$deletion_dir"
	fi

	while read -r files; do
		## On every run, check wheter the next item is already deleted because it is included in a directory already deleted
		if [[ "$files" != "$previous_file/"* ]] && [ "$files" != "" ]; then
			if [ $_VERBOSE -eq 1 ]; then
				Logger "Soft deleting $replica_dir$files" "NOTICE"
			fi

			if [ "$SOFT_DELETE" != "no" ]; then
				if [ $_DRYRUN -ne 1 ]; then
					if [ -e "$replica_dir$deletion_dir/$files" ]; then
						rm -rf "${replica_dir:?}$deletion_dir/$files"
					fi

					if [ -e "$replica_dir$files" ]; then
						# In order to keep full path on soft deletion, create parent directories before move
						parentdir="$(dirname "$files")"
						if [ "$parentdir" != "." ]; then
							mkdir -p "$replica_dir$deletion_dir/$parentdir"
							mv -f "$replica_dir$files" "$replica_dir$deletion_dir/$parentdir"
						else
							mv -f "$replica_dir$files" "$replica_dir$deletion_dir"
						fi
						if [ $? != 0 ]; then
							Logger "Cannot move $replica_dir$files to deletion directory." "ERROR"
							echo "$files" >> "${INITIATOR[1]}${INITIATOR[3]}/$deleted_failed_list_file"
						fi
					fi
				fi
			else
				if [ $_DRYRUN -ne 1 ]; then
					if [ -e "$replica_dir$files" ]; then
						rm -rf "$replica_dir$files"
						if [ $? != 0 ]; then
							Logger "Cannot delete $replica_dir$files" "ERROR"
							echo "$files" >> "${INITIATOR[1]}${INITIATOR[3]}/$deleted_failed_list_file"
						fi
					fi
				fi
			fi
			previous_file="$files"
		fi
	done < "${INITIATOR[1]}${INITIATOR[3]}/$deleted_list_file"
}

function _delete_remote {
	local replica_dir="${1}" # Full path to replica
	local deleted_list_file="${2}" # file containing deleted file list, will be prefixed with replica type
	local deletion_dir="${3}" # deletion dir in format .[workdir]/deleted
	local deleted_failed_list_file="${4}" # file containing files that could not be deleted on last run, will be prefixed with replica type

	local esc_dest_dir
	local rsync_cmd

	## This is a special coded function. Need to redelcare local functions on remote host, passing all needed variables as escaped arguments to ssh command.
	## Anything beetween << ENDSSH and ENDSSH will be executed remotely

	# Additionnaly, we need to copy the deletetion list to the remote state folder
	esc_dest_dir="$(EscapeSpaces "${TARGET[1]}${TARGET[3]}")"
	rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" -e \"$RSYNC_SSH_CMD\" \"${INITIATOR[1]}${INITIATOR[3]}/$deleted_list_file\" $REMOTE_USER@$REMOTE_HOST:\"$esc_dest_dir/\" >> $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.precopy.$SCRIPT_PID 2>&1"
	Logger "RSYNC_CMD: $rsync_cmd" "DEBUG"
	eval "$rsync_cmd" 2>> "$LOG_FILE"
	if [ $? != 0 ]; then
		Logger "Cannot copy the deletion list to remote replica." "ERROR"
		if [ -f "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.precopy.$SCRIPT_PID" ]; then
			Logger "$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.precopy.$SCRIPT_PID)" "ERROR"
		fi
		exit 1
	fi

#TODO(critical): check output file without & and sleep 5
$SSH_CMD ERROR_ALERT=0 sync_on_changes=$sync_on_changes _SILENT=$_SILENT _DEBUG=$_DEBUG _DRYRUN=$_DRYRUN _VERBOSE=$_VERBOSE COMMAND_SUDO=$COMMAND_SUDO FILE_LIST="$(EscapeSpaces "${TARGET[1]}${TARGET[3]}/$deleted_list_file")" REPLICA_DIR="$(EscapeSpaces "$replica_dir")" SOFT_DELETE=$SOFT_DELETE DELETE_DIR="$(EscapeSpaces "$deletion_dir")" FAILED_DELETE_LIST="$(EscapeSpaces "${TARGET[1]}${TARGET[3]}/$deleted_failed_list_file")" 'bash -s' << 'ENDSSH' >> "$RUN_DIR/$PROGRAM.remote_deletion.$SCRIPT_PID" 2>&1

	## The following lines are executed remotely
	function _logger {
		local value="${1}" # What to log
		echo -e "$value" >&2 #TODO(high): logfile output missing

		if [ $_SILENT -eq 0 ]; then
		echo -e "$value"
		fi
	}

	function Logger {
		local value="${1}" # What to log
		local level="${2}" # Log level: DEBUG, NOTICE, WARN, ERROR, CRITIAL

		local prefix="RTIME: $SECONDS - "

		if [ "$level" == "CRITICAL" ]; then
			_logger "$prefix\e[41m$value\e[0m"
			ERROR_ALERT=1
		elif [ "$level" == "ERROR" ]; then
			_logger "$prefix\e[91m$value\e[0m"
			ERROR_ALERT=1
		elif [ "$level" == "WARN" ]; then
			_logger "$prefix\e[93m$value\e[0m"
		elif [ "$level" == "NOTICE" ]; then
			_logger "$prefix$value"
		elif [ "$level" == "DEBUG" ]; then
			if [ "$_DEBUG" == "yes" ]; then
				_logger "$prefix$value"
			fi
		else
			_logger "\e[41mLogger function called without proper loglevel.\e[0m"
			_logger "$prefix$value"
		fi
	}

	## Empty earlier failed delete list
	> "$FAILED_DELETE_LIST"

	parentdir=
	previous_file=""

	if [ -d "$replica_dir$deletion_dir" ] && [ $_DRYRUN -ne 1 ]; then
		$COMMAND_SUDO mkdir -p "$replica_dir$deletion_dir"
	fi

	while read -r files; do
		## On every run, check wheter the next item is already deleted because it is included in a directory already deleted
		if [[ "$files" != "$previous_file/"* ]] && [ "$files" != "" ]; then
			if [ $_VERBOSE -eq 1 ]; then
				Logger "Soft deleting $REPLICA_DIR$files" "NOTICE"
			fi

			if [ "$SOFT_DELETE" != "no" ]; then
				if [ $_DRYRUN -ne 1 ]; then
					if [ -e "$REPLICA_DIR$DELETE_DIR/$files" ]; then
						$COMMAND_SUDO rm -rf "$REPLICA_DIR$DELETE_DIR/$files"
					fi

					if [ -e "$REPLICA_DIR$files" ]; then
						# In order to keep full path on soft deletion, create parent directories before move
						parentdir="$(dirname "$files")"
						if [ "$parentdir" != "." ]; then
							$COMMAND_SUDO mkdir -p "$REPLICA_DIR$DELETE_DIR/$parentdir"
							$COMMAND_SUDO mv -f "$REPLICA_DIR$files" "$REPLICA_DIR$DELETE_DIR/$parentdir"
						else
							$COMMAND_SUDO mv -f "$REPLICA_DIR$files" "$REPLICA_DIR$DELETE_DIR"
						fi
						if [ $? != 0 ]; then
							Logger "Cannot move $REPLICA_DIR$files to deletion directory." "ERROR"
							echo "$files" >> "$FAILED_DELETE_LIST"
						fi
					fi
				fi
			else
				if [ $_DRYRUN -ne 1 ]; then
					if [ -e "$REPLICA_DIR$files" ]; then
						$COMMAND_SUDO rm -rf "$REPLICA_DIR$files"
						if [ $? != 0 ]; then
							Logger "Cannot delete $REPLICA_DIR$files" "ERROR"
							echo "$files" >> "$FAILED_DELETE_LIST"
						fi
					fi
				fi
			fi
			previous_file="$files"
		fi
	done < "$FILE_LIST"
ENDSSH

	## Copy back the deleted failed file list
	esc_source_file="$(EscapeSpaces "${TARGET[1]}${TARGET[3]}/$deleted_failed_list_file")"
	rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" -e \"$RSYNC_SSH_CMD\" $REMOTE_USER@$REMOTE_HOST:\"$esc_source_file\" \"${INITIATOR[1]}${INITIATOR[3]}\" > \"$RUN_DIR/$PROGRAM.remote_failed_deletion_list_copy.$SCRIPT_PID\""
	Logger "RSYNC_CMD: $rsync_cmd" "DEBUG"
	eval "$rsync_cmd" 2>> "$LOG_FILE"
	result=$?
	if [ $result != 0 ]; then
		Logger "Cannot copy back the failed deletion list to initiator replica." "CRITICAL"
		if [ -f "$RUN_DIR/$PROGRAM.remote_failed_deletion_list_copy.$SCRIPT_PID" ]; then
			Logger "Comand output: $(cat $RUN_DIR/$PROGRAM.remote_failed_deletion_list_copy.$SCRIPT_PID)" "NOTICE"
		fi
		exit 1 #WIP exit $retval
	fi
	return 0
}

# delete_propagation(replica name, deleted_list_filename, deleted_failed_file_list)
function deletion_propagation {
	local replica_type="${1}" # Contains replica type: initiator, target
	local deleted_list_file="${2}" # file containing deleted file list, will be prefixed with replica type
	local deleted_failed_list_file="${3}" # file containing files that could not be deleted on last run, will be prefixed with replica type

	local replica_dir
	local delete_dir

	Logger "Propagating deletions to $replica_type replica." "NOTICE"

	if [ "$replica_type" == "${INITIATOR[0]}" ]; then
		replica_dir="${INITIATOR[1]}"
		delete_dir="${INITIATOR[5]}"

		_delete_local "$replica_dir" "${TARGET[0]}$deleted_list_file" "$delete_dir" "${TARGET[0]}$deleted_failed_list_file"
		retval=$?
		if [ $retval != 0 ]; then
			Logger "Deletion on replica $replica_type failed." "CRITICAL"
			exit 1
		fi
	else
		replica_dir="${TARGET[1]}"
		delete_dir="${TARGET[5]}"

		if [ "$REMOTE_OPERATION" == "yes" ]; then
			_delete_remote "$replica_dir" "${INITIATOR[0]}$deleted_list_file" "$delete_dir" "${INITIATOR[0]}$deleted_failed_list_file"
		else
			_delete_local "$replica_dir" "${INITIATOR[0]}$deleted_list_file" "$delete_dir" "${INITIATOR[0]}$deleted_failed_list_file"
		fi
		retval=$?
		if [ $retval == 0 ]; then
			if [ -f "$RUN_DIR/$PROGRAM._delete_remote.$SCRIPT_PID" ] && [ $_VERBOSE -eq 1 ]; then
				Logger "Remote:\n$(cat $RUN_DIR/$PROGRAM._delete_remote.$SCRIPT_PID)" "DEBUG"
			fi
			return $retval
		else
			Logger "Deletion on remote system failed." "CRITICAL"
			if [ -f "$RUN_DIR/$PROGRAM.remote_deletion.$SCRIPT_PID" ]; then
				Logger "Remote:\n$(cat $RUN_DIR/$PROGRAM.remote_deletion.$SCRIPT_PID)" "CRITICAL"
			fi
			exit 1
		fi
	fi
}

###### Sync function in 6 steps
######
###### Step 0a & 0b: Create current file list of replicas
###### Step 1a & 1b: Create deleted file list of replicas
###### Step 3: Update file attributes
###### Step 3a & 3b: Update replicas
###### Step 4a & 4b: Propagate deletions on replicas
###### Step 5a & 5b: Create after run file list of replicas

function Sync {

	local resumeCount
	local resumeInitiator
	local resumeTarget

	local initiatorPid
	local targetPid

	local initiatorFail
	local targetFail

	Logger "Starting synchronization task." "NOTICE"
	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	if [ "$RESUME_SYNC" != "no" ]; then
		if [ -f "${INITIATOR[9]}" ]; then
			resumeCount=$(cat "${INITIATOR[9]}")
		else
			resumeCount=0
		fi

		if [ $resumeCount -lt $RESUME_TRY ]; then
			if [ -f "${INITIATOR[7]}" ]; then
				resumeInitiator=$(cat "${INITIATOR[7]}")
			else
				resumeInitiator="synced"
			fi

			if [ -f "${INITIATOR[8]}" ]; then
				resumeTarget=$(cat "${INITIATOR[8]}")
			else
				resumeTarget="synced"
			fi

			if [ "$resumeInitiator" != "synced" ]; then
				Logger "WARNING: Trying to resume aborted execution on $($STAT_CMD "${INITIATOR[7]}") at task [$resumeInitiator] for initiator. [$resumeCount] previous tries." "WARN"
				echo $(($resumeCount+1)) > "${INITIATOR[9]}"
			else
				resumeInitiator="none"
			fi

			if [ "$resumeTarget" != "synced" ]; then
				Logger "WARNING: Trying to resume aborted execution on $($STAT_CMD "${INITIATOR[8]}") as task [$resumeTarget] for target. [$resumeCount] previous tries." "WARN"
				echo $(($resumeCount+1)) > "${INITIATOR[9]}"
			else
				resumeTarget="none"
			fi
		else
			Logger "Will not resume aborted execution. Too many resume tries [$resumeCount]." "WARN"
			echo "0" > "${INITIATOR[9]}"
			resumeInitiator="none"
			resumeTarget="none"
		fi
	else
		resumeInitiator="none"
		resumeTarget="none"
	fi


	################################################################################################################################################# Actual sync begins here

	## Step 0a & 0b
	if [ "$resumeInitiator" == "none" ] || [ "$resumeTarget" == "none" ] || [ "$resumeInitiator" == "${SYNC_ACTION[0]}" ] || [ "$resumeTarget" == "${SYNC_ACTION[0]}" ]; then
		if [ "$resumeInitiator" == "none" ] || [ "$resumeInitiator" == "${SYNC_ACTION[0]}" ]; then
			tree_list "${INITIATOR[1]}" "${INITIATOR[0]}" "$TREE_CURRENT_FILENAME" &
			initiatorPid="$!"
		fi

		if [ "$resumeTarget" == "none" ] || [ "$resumeTarget" == "${SYNC_ACTION[0]}" ]; then
			tree_list "${TARGET[1]}" "${TARGET[0]}" "$TREE_CURRENT_FILENAME" &
			targetPid="$!"
		fi

		WaitForTaskCompletion "$initiatorPid;$targetPid" $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME ${FUNCNAME[0]} false $KEEP_LOGGING
		if [ $? != 0 ]; then
			IFS=';' read -r -a pidArray <<< "$WAIT_FOR_TASK_COMPLETION"
			initiatorFail=false
			targetFail=false
			for pid in "${pidArray[@]}"; do
				pid=${pid%:*}
				if [ $pid == $initiatorPid ]; then
					echo "${SYNC_ACTION[0]}" > "${INITIATOR[7]}"
					initiatorFail=true
				elif [ $pid == $targetPid ]; then
					echo "${SYNC_ACTION[0]}" > "${INITIATOR[8]}"
					targetFail=true
				fi
			done

			if [ $initiatorFail == false ]; then
				echo "${SYNC_ACTION[1]}" > "${INITIATOR[7]}"
			fi

			if [ $targetFail == false ]; then
				echo "${SYNC_ACTION[1]}" > "${INITIATOR[8]}"
			fi

			exit 1
		else
			echo "${SYNC_ACTION[1]}" > "${INITIATOR[7]}"
			echo "${SYNC_ACTION[1]}" > "${INITIATOR[8]}"
			resumeInitiator="${SYNC_ACTION[1]}"
			resumeTarget="${SYNC_ACTION[1]}"
		fi
	fi

	## Step 1a & 1b
	if [ "$resumeInitiator" == "${SYNC_ACTION[1]}" ] || [ "$resumeTarget" == "${SYNC_ACTION[1]}" ]; then
		if [ "$resumeInitiator" == "${SYNC_ACTION[1]}" ]; then
			delete_list "${INITIATOR[0]}" "$TREE_AFTER_FILENAME" "$TREE_CURRENT_FILENAME" "$DELETED_LIST_FILENAME" "$FAILED_DELETE_LIST_FILENAME" &
			initiatorPid="$!"
		fi

		if [ "$resumeTarget" == "${SYNC_ACTION[1]}" ]; then
			delete_list "${TARGET[0]}" "$TREE_AFTER_FILENAME" "$TREE_CURRENT_FILENAME" "$DELETED_LIST_FILENAME" "$FAILED_DELETE_LIST_FILENAME" &
			targetPid="$!"
		fi

		WaitForTaskCompletion "$initiatorPid;$targetPid" $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME ${FUNCNAME[0]} false $KEEP_LOGGING
		if [ $? != 0 ]; then
			IFS=';' read -r -a pidArray <<< "$WAIT_FOR_TASK_COMPLETION"
			initiatorFail=false
			targetFail=false
			for pid in "${pidArray[@]}"; do
				pid=${pid%:*}
				if [ $pid == $initiatorPid ]; then
					echo "${SYNC_ACTION[1]}" > "${INITIATOR[7]}"
					initiatorFail=true
				elif [ $pid == $targetPid ]; then
					echo "${SYNC_ACTION[1]}" > "${INITIATOR[8]}"
					targetFail=true
				fi
			done

			if [ $initiatorFail == false ]; then
				echo "${SYNC_ACTION[2]}" > "${INITIATOR[7]}"
			fi

			if [ $targetFail == false ]; then
				echo "${SYNC_ACTION[2]}" > "${INITIATOR[8]}"
			fi

			exit 1
		else
			echo "${SYNC_ACTION[2]}" > "${INITIATOR[7]}"
			echo "${SYNC_ACTION[2]}" > "${INITIATOR[8]}"
			resumeInitiator="${SYNC_ACTION[2]}"
			resumeTarget="${SYNC_ACTION[2]}"
		fi
	fi

	## Step 2
	if [ "$resumeInitiator" == "${SYNC_ACTION[2]}" ] || [ "$resumeTarget" == "${SYNC_ACTION[2]}" ]; then
		if [ "$RSYNC_ATTR_ARGS" != "" ]; then
			sync_attrs "${INITIATOR[1]}" "$TARGET_SYNC_DIR"
			WaitForTaskCompletion $! $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME ${FUNCNAME[0]} false $KEEP_LOGGING
			if [ $? != 0 ]; then
				echo "${SYNC_ACTION[2]}" > "${INITIATOR[7]}"
				echo "${SYNC_ACTION[2]}" > "${INITIATOR[8]}"
				exit 1
			else
				echo "${SYNC_ACTION[3]}" > "${INITIATOR[7]}"
				echo "${SYNC_ACTION[3]}" > "${INITIATOR[8]}"
				resumeInitiator="${SYNC_ACTION[3]}"
				resumeTarget="${SYNC_ACTION[3]}"

			fi
		else
			echo "${SYNC_ACTION[3]}" > "${INITIATOR[7]}"
			echo "${SYNC_ACTION[3]}" > "${INITIATOR[8]}"
			resumeInitiator="${SYNC_ACTION[3]}"
			resumeTarget="${SYNC_ACTION[3]}"
		fi
	fi

	## Step 3a & 3b
	if [ "$resumeInitiator" == "${SYNC_ACTION[3]}" ] || [ "$resumeTarget" == "${SYNC_ACTION[3]}" ]; then
		if [ "$resumeInitiator" == "${SYNC_ACTION[3]}" ]; then
			sync_update "${TARGET[0]}" "${INITIATOR[0]}" "$DELETED_LIST_FILENAME" &
			initiatorPid="$!"
		fi

		if [ "$resumeTarget" == "${SYNC_ACTION[3]}" ]; then
			sync_update "${INITIATOR[0]}" "${TARGET[0]}" "$DELETED_LIST_FILENAME" &
			targetPid="$!"
		fi

		WaitForTaskCompletion "$initiatorPid;$targetPid" $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME ${FUNCNAME[0]} false $KEEP_LOGGING
		if [ $? != 0 ]; then
			IFS=';' read -r -a pidArray <<< "$WAIT_FOR_TASK_COMPLETION"
			initiatorFail=false
			targetFail=false
			for pid in "${pidArray[@]}"; do
				pid=${pid%:*}
				if [ $pid == $initiatorPid ]; then
					echo "${SYNC_ACTION[3]}" > "${INITIATOR[7]}"
					initiatorFail=true
				elif [ $pid == $targetPid ]; then
					echo "${SYNC_ACTION[3]}" > "${INITIATOR[8]}"
					targetFail=true
				fi
			done

			if [ $initiatorFail == false ]; then
				echo "${SYNC_ACTION[4]}" > "${INITIATOR[7]}"
			fi

			if [ $targetFail == false ]; then
				echo "${SYNC_ACTION[4]}" > "${INITIATOR[8]}"
			fi

			exit 1
		else
			echo "${SYNC_ACTION[4]}" > "${INITIATOR[7]}"
			echo "${SYNC_ACTION[4]}" > "${INITIATOR[8]}"
			resumeInitiator="${SYNC_ACTION[4]}"
			resumeTarget="${SYNC_ACTION[4]}"
		fi
	fi

	## Step 4a & 4b
	if [ "$resumeInitiator" == "${SYNC_ACTION[4]}" ] || [ "$resumeTarget" == "${SYNC_ACTION[4]}" ]; then
		if [ "$resumeInitiator" == "${SYNC_ACTION[4]}" ]; then
			deletion_propagation "${TARGET[0]}" "$DELETED_LIST_FILENAME" "$FAILED_DELETE_LIST_FILENAME" &
			initiatorPid="$!"
		fi

		if [ "$resumeTarget" == "${SYNC_ACTION[4]}" ]; then
			deletion_propagation "${INITIATOR[0]}" "$DELETED_LIST_FILENAME" "$FAILED_DELETE_LIST_FILENAME" &
			targetPid="$!"
		fi

		WaitForTaskCompletion "$initiatorPid;$targetPid" $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME ${FUNCNAME[0]} false $KEEP_LOGGING
		if [ $? != 0 ]; then
			IFS=';' read -r -a pidArray <<< "$WAIT_FOR_TASK_COMPLETION"
			initiatorFail=false
			targetFail=false
			for pid in "${pidArray[@]}"; do
				pid=${pid%:*}
				if [ $pid == $initiatorPid ]; then
					echo "${SYNC_ACTION[4]}" > "${INITIATOR[7]}"
					initiatorFail=true
				elif [ $pid == $targetPid ]; then
					echo "${SYNC_ACTION[4]}" > "${INITIATOR[8]}"
					targetFail=true
				fi
			done

			if [ $initiatorFail == false ]; then
				echo "${SYNC_ACTION[5]}" > "${INITIATOR[7]}"
			fi

			if [ $targetFail == false ]; then
				echo "${SYNC_ACTION[5]}" > "${INITIATOR[8]}"
			fi

			exit 1
		else
			echo "${SYNC_ACTION[5]}" > "${INITIATOR[7]}"
			echo "${SYNC_ACTION[5]}" > "${INITIATOR[8]}"
			resumeInitiator="${SYNC_ACTION[5]}"
			resumeTarget="${SYNC_ACTION[5]}"

		fi
	fi

	## Step 5a & 5b
	if [ "$resumeInitiator" == "${SYNC_ACTION[5]}" ] || [ "$resumeTarget" == "${SYNC_ACTION[5]}" ]; then
		if [ "$resumeInitiator" == "${SYNC_ACTION[5]}" ]; then
			tree_list "${INITIATOR[1]}" "${INITIATOR[0]}" "$TREE_AFTER_FILENAME" &
			initiatorPid="$!"
		fi

		if [ "$resumeTarget" == "${SYNC_ACTION[5]}" ]; then
			tree_list "${TARGET[1]}" "${TARGET[0]}" "$TREE_AFTER_FILENAME" &
			targetPid="$!"
		fi

		WaitForTaskCompletion "$initiatorPid;$targetPid" $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME ${FUNCNAME[0]} false $KEEP_LOGGING
		if [ $? != 0 ]; then
			IFS=';' read -r -a pidArray <<< "$WAIT_FOR_TASK_COMPLETION"
			initiatorFail=false
			targetFail=false
			for pid in "${pidArray[@]}"; do
				pid=${pid%:*}
				if [ $pid == $initiatorPid ]; then
					echo "${SYNC_ACTION[5]}" > "${INITIATOR[7]}"
					initiatorFail=true
				elif [ $pid == $targetPid ]; then
					echo "${SYNC_ACTION[5]}" > "${INITIATOR[8]}"
					targetFail=true
				fi
			done

			if [ $initiatorFail == false ]; then
				echo "${SYNC_ACTION[6]}" > "${INITIATOR[7]}"
			fi

			if [ $targetFail == false ]; then
				echo "${SYNC_ACTION[6]}" > "${INITIATOR[8]}"
			fi

			exit 1
		else
			echo "${SYNC_ACTION[6]}" > "${INITIATOR[7]}"
			echo "${SYNC_ACTION[6]}" > "${INITIATOR[8]}"
			resumeInitiator="${SYNC_ACTION[6]}"
			resumeTarget="${SYNC_ACTION[6]}"
		fi
	fi

	Logger "Finished synchronization task." "NOTICE"
	echo "0" > "${INITIATOR[9]}"
}

function _SoftDeleteLocal {
	local replica_type="${1}" # replica type (initiator, target)
	local replica_deletion_path="${2}" # Contains the full path to softdelete / backup directory without ending slash
	local change_time="${3}"

	local retval

	if [ -d "$replica_deletion_path" ]; then
		if [ $_DRYRUN -eq 1 ]; then
			Logger "Listing files older than $change_time days on $replica_type replica. Does not remove anything." "NOTICE"
		else
			Logger "Removing files older than $change_time days on $replica_type replica." "NOTICE"
		fi

		if [ $_VERBOSE -eq 1 ]; then
			# Cannot launch log function from xargs, ugly hack
			$COMMAND_SUDO $FIND_CMD "$replica_deletion_path/" -type f -ctime +$change_time -print0 | xargs -0 -I {} echo "Will delete file {}" >> "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID"
			Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
			$COMMAND_SUDO $FIND_CMD "$replica_deletion_path/" -type d -empty -ctime +$change_time -print0 | xargs -0 -I {} echo "Will delete directory {}" >> "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID"
			Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
		fi

		if [ $_DRYRUN -ne 1 ]; then
			$COMMAND_SUDO $FIND_CMD "$replica_deletion_path/" -type f -ctime +$change_time -print0 | xargs -0 -I {} $COMMAND_SUDO rm -f "{}" && $COMMAND_SUDO $FIND_CMD "$replica_deletion_path/" -type d -empty -ctime +$change_time -print0 | xargs -0 -I {} $COMMAND_SUDO rm -rf "{}" >> "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID" 2>&1
		else
			Dummy
		fi
		retval=$?
		if [ $retval -ne 0 ]; then
			Logger "Error while executing cleanup on $replica_type replica." "ERROR"
			Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
		else
			Logger "Cleanup complete on $replica_type replica." "NOTICE"
		fi
	elif [ -d "$replica_deletion_path" ] && ! [ -w "$replica_deletion_path" ]; then
		Logger "Warning: $replica_type replica dir [$replica_deletion_path] is not writable. Cannot clean old files." "ERROR"
	fi
}

function _SoftDeleteRemote {
	local replica_type="${1}"
	local replica_deletion_path="${2}" # Contains the full path to softdelete / backup directory without ending slash
	local change_time="${3}"

	local retval

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	if [ $_DRYRUN -eq 1 ]; then
		Logger "Listing files older than $change_time days on $replica_type replica. Does not remove anything." "NOTICE"
	else
		Logger "Removing files older than $change_time days on $replica_type replica." "NOTICE"
	fi

	if [ $_VERBOSE -eq 1 ]; then
		# Cannot launch log function from xargs, ugly hack
		cmd=$SSH_CMD' "if [ -d \"'$replica_deletion_path'\" ]; then '$COMMAND_SUDO' '$REMOTE_FIND_CMD' \"'$replica_deletion_path'/\" -type f -ctime +'$change_time' -print0 | xargs -0 -I {} echo Will delete file {} && '$COMMAND_SUDO' '$REMOTE_FIND_CMD' \"'$replica_deletion_path'/\" -type d -empty -ctime '$change_time' -print0 | xargs -0 -I {} echo Will delete directory {}; else echo \"No remote backup/deletion directory.\"; fi" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'" 2>&1'
		Logger "cmd: $cmd" "DEBUG"
		eval "$cmd"
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
	fi

	if [ $_DRYRUN -ne 1 ]; then
		cmd=$SSH_CMD' "if [ -d \"'$replica_deletion_path'\" ]; then '$COMMAND_SUDO' '$REMOTE_FIND_CMD' \"'$replica_deletion_path'/\" -type f -ctime +'$change_time' -print0 | xargs -0 -I {} '$COMMAND_SUDO' rm -f \"{}\" && '$COMMAND_SUDO' '$REMOTE_FIND_CMD' \"'$replica_deletion_path'/\" -type d -empty -ctime '$change_time' -print0 | xargs -0 -I {} '$COMMAND_SUDO' rm -rf \"{}\"; else echo \"No remote backup/deletion directory.\"; fi" > "'$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID'" 2>&1'

		Logger "cmd: $cmd" "DEBUG"
		eval "$cmd"
	else
		Dummy
	fi
	retval=$?
	if [ $retval -ne 0 ]; then
		Logger "Error while executing cleanup on remote $replica_type replica." "ERROR"
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID)" "NOTICE"
	else
		Logger "Cleanup complete on $replica_type replica." "NOTICE"
	fi
}

function SoftDelete {

	local pids

	if [ "$CONFLICT_BACKUP" != "no" ] && [ $CONFLICT_BACKUP_DAYS -ne 0 ]; then
		Logger "Running conflict backup cleanup." "NOTICE"

		_SoftDeleteLocal "${INITIATOR[0]}" "${INITIATOR[1]}${INITIATOR[4]}" $CONFLICT_BACKUP_DAYS &
		pids="$!"
		if [ "$REMOTE_OPERATION" != "yes" ]; then
			_SoftDeleteLocal "${TARGET[0]}" "${TARGET[1]}${TARGET[4]}" $CONFLICT_BACKUP_DAYS &
			pids="$pids;$!"
		else
			_SoftDeleteRemote "${TARGET[0]}" "${TARGET[1]}${TARGET[4]}" $CONFLICT_BACKUP_DAYS &
			pids="$pids;$!"
		fi
		WaitForTaskCompletion $pids 720 1800 ${FUNCNAME[0]} true $KEEP_LOGGING
	fi

	if [ "$SOFT_DELETE" != "no" ] && [ $SOFT_DELETE_DAYS -ne 0 ]; then
		Logger "Running soft deletion cleanup." "NOTICE"

		_SoftDeleteLocal "${INITIATOR[0]}" "${INITIATOR[1]}${INITIATOR[5]}" $SOFT_DELETE_DAYS &
		pids="$!"
		if [ "$REMOTE_OPERATION" != "yes" ]; then
			_SoftDeleteLocal "${TARGET[0]}" "${TARGET[1]}${TARGET[5]}" $SOFT_DELETE_DAYS &
			pids="$pids;$!"
		else
			_SoftDeleteRemote "${TARGET[0]}" "${TARGET[1]}${TARGET[5]}" $SOFT_DELETE_DAYS &
			pids="$pids;$!"
		fi
		WaitForTaskCompletion $pids 720 1800 ${FUNCNAME[0]} true $KEEP_LOGGING
	fi
}

function Init {

	# Set error exit code if a piped command fails
	set -o pipefail
	set -o errtrace

	# Do not use exit and quit traps if osync runs in monitor mode
	if [ $sync_on_changes -eq 0 ]; then
		trap TrapStop INT HUP TERM QUIT
		trap TrapQuit EXIT
	else
		trap TrapQuit TERM EXIT HUP QUIT
	fi

	local uri
	local hosturiandpath
	local hosturi


	## Test if target dir is a ssh uri, and if yes, break it down it its values
	if [ "${TARGET_SYNC_DIR:0:6}" == "ssh://" ]; then
		REMOTE_OPERATION="yes"

		# remove leadng 'ssh://'
		uri=${TARGET_SYNC_DIR#ssh://*}
		if [[ "$uri" == *"@"* ]]; then
			# remove everything after '@'
			REMOTE_USER=${uri%@*}
		else
			REMOTE_USER=$LOCAL_USER
		fi

		if [ "$SSH_RSA_PRIVATE_KEY" == "" ]; then
			SSH_RSA_PRIVATE_KEY=~/.ssh/id_rsa
		fi

		# remove everything before '@'
		hosturiandpath=${uri#*@}
		# remove everything after first '/'
		hosturi=${hosturiandpath%%/*}
		if [[ "$hosturi" == *":"* ]]; then
			REMOTE_PORT=${hosturi##*:}
		else
			REMOTE_PORT=22
		fi
		REMOTE_HOST=${hosturi%%:*}

		# remove everything before first '/'
		TARGET_SYNC_DIR=${hosturiandpath#*/}
	fi

	## Make sure there is only one trailing slash on path
	INITIATOR_SYNC_DIR="${INITIATOR_SYNC_DIR%/}/"
	TARGET_SYNC_DIR="${TARGET_SYNC_DIR%/}/"

	## Replica format
	## Why the f*** does bash not have simple objects ?

	#${REPLICA[0]}	contains replica type (initiator / target)
	#${REPLICA[1]}	contains full replica path (can be absolute or relative) with ending slash
	#${REPLICA[2]}	contains full lock file path
	#${REPLICA[3]}	contains state dir path, relative to replica path
	#${REPLICA[4]}	contains backup dir path, relative to replica path
	#${REPLICA[5]}	contains deletion dir path, relative to replica path
	#${REPLICA[6]}	contains partial dir path, relative to replica path
	#${REPLICA[7]}  contains full initiator last action file path
	#${REPLICA[8]}  contains full target last action file path
	#${REPLICA[9]}  contains full resume count file path

	# Local variables used for state filenames
	local lock_filename="lock"
	local state_dir="state"
	local backup_dir="backup"
	local delete_dir="deleted"
	local partial_dir="_partial"
	local last_action="last-action"
	local resume_count="resume-count"
	if [ "$_DRYRUN" -eq 1 ]; then
		local dry_suffix="-dry"
	else
		local dry_suffix=
	fi

	#TODO(low): integrate this into ${REPLICA[x]}
	TREE_CURRENT_FILENAME="-tree-current-$INSTANCE_ID$dry_suffix"
	TREE_AFTER_FILENAME="-tree-after-$INSTANCE_ID$dry_suffix"
	TREE_AFTER_FILENAME_NO_SUFFIX="-tree-after-$INSTANCE_ID"
	DELETED_LIST_FILENAME="-deleted-list-$INSTANCE_ID$dry_suffix"
	FAILED_DELETE_LIST_FILENAME="-failed-delete-$INSTANCE_ID$dry_suffix"


	INITIATOR=(
	'initiator'
	"$INITIATOR_SYNC_DIR"
	"$INITIATOR_SYNC_DIR$OSYNC_DIR/$lock_filename"
	"$OSYNC_DIR/$state_dir"
	"$OSYNC_DIR/$backup_dir"
	"$OSYNC_DIR/$delete_dir"
	"$OSYNC_DIR/$partial_dir"
	"$INITIATOR_SYNC_DIR$OSYNC_DIR/$state_dir/initiator-$last_action-$INSTANCE_ID$dry_suffix"
	"$INITIATOR_SYNC_DIR$OSYNC_DIR/$state_dir/target-$last_action-$INSTANCE_ID$dry_suffix"
	"$INITIATOR_SYNC_DIR$OSYNC_DIR/$state_dir/$resume_count-$INSTANCE_ID$dry_suffix"
	)

	TARGET=(
	'target'
	"$TARGET_SYNC_DIR"
	"$TARGET_SYNC_DIR$OSYNC_DIR/$lock_filename"
	"$OSYNC_DIR/$state_dir"
	"$OSYNC_DIR/$backup_dir"
	"$OSYNC_DIR/$delete_dir"
	"$OSYNC_DIR/$partial_dir"
	"$TARGET_SYNC_DIR$OSYNC_DIR/$state_dir/$last_action-$INSTANCE_ID$dry_suffix"
	"$TARGET_SYNC_DIR$OSYNC_DIR/$state_dir/$resume_count-$INSTANCE_ID$dry_suffix"
	)

	PARTIAL_DIR=$OSYNC_DIR"_partial"

	## Set sync only function arguments for rsync
	SYNC_OPTS="-u"

	if [ $_VERBOSE -eq 1 ]; then
		SYNC_OPTS=$SYNC_OPTS" -i"
	fi

	if [ $STATS -eq 1 ]; then
		SYNC_OPTS=$SYNC_OPTS" --stats"
	fi

	## Add Rsync include / exclude patterns
	if [ $_QUICK_SYNC -lt 2 ]; then
		RsyncPatterns
	fi

	## Conflict options
	if [ "$CONFLICT_BACKUP" != "no" ]; then
		INITIATOR_BACKUP="--backup --backup-dir=\"${INITIATOR[1]}${INITIATOR[4]}\""
		TARGET_BACKUP="--backup --backup-dir=\"${TARGET[1]}${TARGET[4]}\""
		if [ "$CONFLICT_BACKUP_MULTIPLE" == "yes" ]; then
			INITIATOR_BACKUP="$INITIATOR_BACKUP --suffix .$(date +%Y.%m.%d-%H.%M.%S)"
			TARGET_BACKUP="$TARGET_BACKUP --suffix .$(date +%Y.%m.%d-%H.%M.%S)"
		fi
	else
		INITIATOR_BACKUP=""
		TARGET_BACKUP=""
	fi

	SYNC_ACTION=(
	'replica-tree'
	'deleted-list'
	'sync_attrs'
	'update-replica'
	'delete-propagation'
	'replica-tree-after'
	'synced'
	)
}

function Main {

	CreateStateDirs
	CheckLocks
	Sync
}

function Usage {

	if [ "$IS_STABLE" != "yes" ]; then
		echo -e "\e[93mThis is an unstable dev build. Please use with caution.\e[0m"
	fi

	echo "$PROGRAM $PROGRAM_VERSION $PROGRAM_BUILD"
	echo $AUTHOR
	echo $CONTACT
	echo ""
	echo "You may use osync with a full blown configuration file, or use its default options for quick command line sync."
	echo "Usage: osync.sh /path/to/config/file [OPTIONS]"
	echo "or     osync.sh --initiator=/path/to/initiator/replica --target=/path/to/target/replica [OPTIONS] [QUICKSYNC OPTIONS]"
	echo "or     osync.sh --initiator=/path/to/initiator/replica --target=ssh://[backupuser]@remotehost.com[:portnumber]//path/to/target/replica [OPTIONS] [QUICKSYNC OPTIONS]"
	echo ""
	echo "[OPTIONS]"
	echo "--dry             Will run osync without actually doing anything; just testing"
	echo "--silent          Will run osync without any output to stdout, used for cron jobs"
	echo "--verbose         Increases output"
	echo "--stats           Adds rsync transfer statistics to verbose output"
	echo "--partial         Allows rsync to keep partial downloads that can be resumed later (experimental)"
	echo "--no-maxtime      Disables any soft and hard execution time checks"
	echo "--force-unlock    Will override any existing active or dead locks on initiator and target replica"
	echo "--on-changes      Will launch a sync task after a short wait period if there is some file activity on initiator replica. You should try daemon mode instead"
	echo ""
	echo "[QUICKSYNC OPTIONS]"
	echo "--initiator=\"\"		Master replica path. Will contain state and backup directory (is mandatory)"
	echo "--target=\"\" 		Local or remote target replica path. Can be a ssh uri like ssh://user@host.com:22//path/to/target/replica (is mandatory)"
	echo "--rsakey=\"\"		Alternative path to rsa private key for ssh connection to target replica"
	echo "--instance-id=\"\"	Optional sync task name to identify this synchronization task when using multiple targets"
	echo ""
	echo "Additionaly, you may set most osync options at runtime. eg:"
	echo "SOFT_DELETE_DAYS=365 osync.sh --initiator=/path --target=/other/path"
	echo ""
	exit 128
}

function SyncOnChanges {

	local cmd
	local retval

	if ! type inotifywait > /dev/null 2>&1 ; then
		Logger "No inotifywait command found. Cannot monitor changes." "CRITICAL"
		exit 1
	fi

	Logger "#### Running osync in file monitor mode." "NOTICE"

	while true; do
		if [ "$ConfigFile" != "" ]; then
			cmd='bash '$osync_cmd' "'$ConfigFile'" '$opts
		else
			cmd='bash '$osync_cmd' '$opts
		fi
		Logger "daemon cmd: $cmd" "DEBUG"
		eval "$cmd"
		retval=$?
		if [ $retval != 0 ] && [ $retval != 2 ]; then
			Logger "osync child exited with error." "ERROR"
		fi

		Logger "#### Monitoring now." "NOTICE"
		inotifywait --exclude $OSYNC_DIR $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE -qq -r -e create -e modify -e delete -e move -e attrib --timeout "$MAX_WAIT" "$INITIATOR_SYNC_DIR" &
		wait $!
		retval=$?
		if [ $retval == 0 ]; then
			Logger "#### Changes detected, waiting $MIN_WAIT seconds before running next sync." "NOTICE"
			sleep $MIN_WAIT
		elif [ $retval == 2 ]; then
			Logger "#### $MAX_WAIT timeout reached, running sync." "NOTICE"
		else
			Logger "#### inotify error detected, waiting $MIN_WAIT seconds before running next sync." "ERROR"
			sleep $MIN_WAIT
		fi
	done

}

# quicksync mode settings, overriden by config file
STATS=0
PARTIAL=0
if [ "$CONFLICT_PREVALANCE" == "" ]; then
	CONFLICT_PREVALANCE=initiator
fi

LOCK_FILES_EXIST=0
FORCE_UNLOCK=0
no_maxtime=0
opts=""
ERROR_ALERT=0
SOFT_STOP=0
_QUICK_SYNC=0
sync_on_changes=0
_NOLOCKS=0
osync_cmd=$0

if [ $# -eq 0 ]
then
	Usage
fi

first=1
for i in "$@"; do
	case $i in
		--dry)
		_DRYRUN=1
		opts=$opts" --dry"
		;;
		--silent)
		_SILENT=1
		opts=$opts" --silent"
		;;
		--verbose)
		_VERBOSE=1
		opts=$opts" --verbose"
		;;
		--stats)
		STATS=1
		opts=$opts" --stats"
		;;
		--partial)
		PARTIAL="yes"
		opts=$opts" --partial"
		;;
		--force-unlock)
		FORCE_UNLOCK=1
		opts=$opts" --force-unlock"
		;;
		--no-maxtime)
		no_maxtime=1
		opts=$opts" --no-maxtime"
		;;
		--help|-h|--version|-v)
		Usage
		;;
		--initiator=*)
		_QUICK_SYNC=$(($_QUICK_SYNC + 1))
		no_maxtime=1
		INITIATOR_SYNC_DIR=${i##*=}
		opts=$opts" --initiator=\"$INITIATOR_SYNC_DIR\""
		;;
		--target=*)
		_QUICK_SYNC=$(($_QUICK_SYNC + 1))
		TARGET_SYNC_DIR=${i##*=}
		opts=$opts" --target=\"$TARGET_SYNC_DIR\""
		no_maxtime=1
		;;
		--rsakey=*)
		SSH_RSA_PRIVATE_KEY=${i##*=}
		opts=$opts" --rsakey=\"$SSH_RSA_PRIVATE_KEY\""
		;;
		--instance-id=*)
		INSTANCE_ID=${i##*=}
		opts=$opts" --instance-id=\"$INSTANCE_ID\""
		;;
		--on-changes)
		sync_on_changes=1
		_NOLOCKS=1
		_LOGGER_PREFIX="date"
		_LOGGER_STDERR=1
		;;
		--no-locks)
		_NOLOCKS=1
		;;
		*)
		if [ $first == "0" ]; then
			Logger "Unknown option '$i'" "CRITICAL"
			Usage
		fi
		;;
	esac
	first=0
done

# Remove leading space if there is one
opts="${opts# *}"

	## Here we set default options for quicksync tasks when no configuration file is provided.

	if [ $_QUICK_SYNC -eq 2 ]; then
		if [ "$INSTANCE_ID" == "" ]; then
			INSTANCE_ID="quicksync_task"
		fi

		# Let the possibility to initialize those values directly via command line like SOFT_DELETE_DAYS=60 ./osync.sh

		if [ "$MINIMUM_SPACE" == "" ]; then
			MINIMUM_SPACE=1024
		fi

		if [ "$CONFLICT_BACKUP_DAYS" == "" ]; then
			CONFLICT_BACKUP_DAYS=30
		fi

		if [ "$SOFT_DELETE_DAYS" == "" ]; then
			SOFT_DELETE_DAYS=30
		fi

		if [ "$RESUME_TRY" == "" ]; then
			RESUME_TRY=1
		fi

		if [ "$SOFT_MAX_EXEC_TIME" == "" ]; then
			SOFT_MAX_EXEC_TIME=0
		fi

		if [ "$HARD_MAX_EXEC_TIME" == "" ]; then
			HARD_MAX_EXEC_TIME=0
		fi

		MIN_WAIT=30
		REMOTE_OPERATION=no
	else
		ConfigFile="${1}"
		LoadConfigFile "$ConfigFile"
	fi

	if [ "$LOGFILE" == "" ]; then
		if [ -w /var/log ]; then
			LOG_FILE="/var/log/$PROGRAM.$INSTANCE_ID.log"
		elif ([ "$HOME" != "" ] && [ -w "$HOME" ]); then
			LOG_FILE="$HOME/$PROGRAM.$INSTANCE_ID.log"
		else
			LOG_FILE="./$PROGRAM.$INSTANCE_ID.log"
		fi
	else
		LOG_FILE="$LOGFILE"
	fi
	Logger "Script begin, logging to [$LOG_FILE]." "DEBUG"

	if [ "$IS_STABLE" != "yes" ]; then
		Logger "This is an unstable dev build. Please use with caution." "WARN"
	fi

	GetLocalOS
	InitLocalOSSettings
	CheckEnvironment
	PreInit
	Init
	PostInit
	if [ $_QUICK_SYNC -lt 2 ]; then
		CheckCurrentConfig
	fi

	DATE=$(date)
	Logger "-------------------------------------------------------------" "NOTICE"
	Logger "$DRY_WARNING $DATE - $PROGRAM $PROGRAM_VERSION script begin." "NOTICE"
	Logger "-------------------------------------------------------------" "NOTICE"
	Logger "Sync task [$INSTANCE_ID] launched as $LOCAL_USER@$LOCAL_HOST (PID $SCRIPT_PID)" "NOTICE"

	if [ $sync_on_changes -eq 1 ]; then
		SyncOnChanges
	else
		GetRemoteOS
		InitRemoteOSSettings

		if [ $no_maxtime -eq 1 ]; then
			SOFT_MAX_EXEC_TIME=0
			HARD_MAX_EXEC_TIME=0
		fi
		CheckReplicaPaths
		CheckDiskSpace
		RunBeforeHook
		Main
		if [ $? == 0 ]; then
			SoftDelete
		fi
	fi