#!/usr/bin/env bash

PROGRAM="osync" # Rsync based two way sync engine with fault tolerance
AUTHOR="(L) 2013-2016 by Orsiris de Jong"
CONTACT="http://www.netpower.fr/osync - ozy@netpower.fr"
PROGRAM_VERSION=1.1-dev
PROGRAM_BUILD=2016021602
IS_STABLE=no

source "./ofunctions.sh"

## Working directory. This is the name of the osync subdirectory contained in every replica.
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 1
	fi
}

function TrapQuit {
	if [ $ERROR_ALERT -ne 0 ]; then
		UnlockReplicas
		if [ "$_DEBUG" != "yes" ]
		then
			SendAlert
		else
			Logger "Debug mode, no alert mail will be sent." "NOTICE"
		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
		CleanUp
		Logger "$PROGRAM finished with warnings." "WARN"
	else
		UnlockReplicas
		CleanUp
		Logger "$PROGRAM finished." "NOTICE"
		exitcode=0
	fi

#TODO: Check new KillChilds function for service mode

#	if ps -p $OSYNC_SUB_PID > /dev/null 2>&1
#	then
#		kill -s SIGTERM $OSYNC_SUB_PID
#		if [ $? == 0 ]; then
#			Logger "Stopped sub process [$OSYNC_SUB_PID]." "DEBUG"
#		else
#			Logger "Could not terminate sub process [$OSYNC_SUB_PID]. Trying the hard way." "DEBUG"
#			kill -9 $OSYNC_SUB_PID
#			if [ $? != 0 ]; then
#				Logger "Could not kill sub process [$OSYNC_SUB_PID]." "ERROR"
#			fi
#		fi
#	fi

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

	exit $exitcode
}

function CheckEnvironment {
        __CheckArguments 0 $# $FUNCNAME "$@"    #__WITH_PARANOIA_DEBUG

        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 {
        __CheckArguments 0 $# $FUNCNAME "$@"    #__WITH_PARANOIA_DEBUG

        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 REMOTE_HOST_PING 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)
        for i in ${yes_no_vars[@]}; do
                test="if [ \"\$$i\" != \"yes\" ] && [ \"\$$i\" != \"no\" ]; then Logger \"Bogus $i value defined in config file.\" \"CRITICAL\"; exit 1; fi"
                eval "$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 MIN_WAIT MAX_WAIT CONFLICT_BACKUP_DAYS SOFT_DELETE_DAYS RESUME_TRY)
        for i in ${num_vars[@]}; do
		test="if [ $(IsNumeric \"\$$i\") -eq 0 ]; then Logger \"Bogus $i value defined in config file.\" \"CRITICAL\"; exit 1; fi"
                eval "$test"
        done

        #TODO-v2.1: Add runtime variable tests (RSYNC_ARGS etc)
}

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

function _CreateStateDirsLocal {
	local replica_state_dir="${1}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

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

function _CreateStateDirsRemote {
	local replica_state_dir="${1}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "if ! [ -d \"'$replica_state_dir'\" ]; then '$COMMAND_SUDO' mkdir -p \"'$replica_state_dir'\"; fi" > "'$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID'" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd" &
	WaitForTaskCompletion $! 720 1800 $FUNCNAME
	if [ $? != 0 ]; then
		Logger "Cannot create remote state dir [$replica_state_dir]." "CRITICAL"
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID)" "ERROR"
		exit 1
	fi
}

function CreateStateDirs {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	_CreateStateDirsLocal "$INITIATOR_STATE_DIR"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_CreateStateDirsLocal "$TARGET_STATE_DIR"
	else
		_CreateStateDirsRemote "$TARGET_STATE_DIR"
	fi
}

function _CheckReplicaPathsLocal {
	local replica_path="${1}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	if [ ! -d "$replica_path" ]; then
		if [ "$CREATE_DIRS" == "yes" ]; then
			$COMMAND_SUDO mkdir -p "$replica_path" > "$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID" 2>&1
			if [ $? != 0 ]; then
				Logger "Cannot create local replica path [$replica_path]." "CRITICAL"
				Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$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

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

function _CheckReplicaPathsRemote {
	local replica_path="${1}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost
	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.$SCRIPT_PID'" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd" &
	WaitForTaskCompletion $! 720 1800 $FUNCNAME
	if [ $? != 0 ]; then
		Logger "Cannot create remote replica path [$replica_path]." "CRITICAL"
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID)" "ERROR"
		exit 1
	fi

	cmd=$SSH_CMD' "if [ ! -w \"'$replica_path'\" ];then exit 1; fi" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd" &
	WaitForTaskCompletion $! 720 1800 $FUNCNAME
	if [ $? != 0 ]; then
		Logger "Remote replica path [$replica_path] is not writable." "CRITICAL"
		exit 1
	fi
}

function CheckReplicaPaths {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	#INITIATOR_SYNC_DIR_CANN=$(realpath "$INITIATOR_SYNC_DIR")	#TODO: investigate realpath & readlink issues on MSYS and busybox here
	#TARGET_SYNC_DIR_CANN=$(realpath "$TARGET_SYNC_DIR")

	#if [ "$REMOTE_OPERATION" != "yes" ]; then
	#	if [ "$INITIATOR_SYNC_DIR_CANN" == "$TARGET_SYNC_DIR_CANN" ]; then
	#		Logger "Master directory [$INITIATOR_SYNC_DIR] cannot be the same as target directory." "CRITICAL"
	#		exit 1
	#	fi
	#fi

	_CheckReplicaPathsLocal "$INITIATOR_SYNC_DIR"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_CheckReplicaPathsLocal "$TARGET_SYNC_DIR"
	else
		_CheckReplicaPathsRemote "$TARGET_SYNC_DIR"
	fi
}

function _CheckDiskSpaceLocal {
	local replica_path="${1}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

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

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

function _CheckDiskSpaceRemote {
	local replica_path="${1}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

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

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "'$COMMAND_SUDO' df -P \"'$replica_path'\"" > "'$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID'" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd" &
	WaitForTaskCompletion $! 720 1800 $FUNCNAME
	if [ $? != 0 ]; then
		Logger "Cannot get free space on target [$replica_path]." "ERROR"
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID)" "NOTICE"
	else
		local target_space=$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID | tail -1 | awk '{print $4}')
		if [ $target_space -lt $MINIMUM_SPACE ]; then
			Logger "There is not enough free space on target [$replica_path]." "WARN"
		fi
	fi
}

function CheckDiskSpace {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	_CheckDiskSpaceLocal "$INITIATOR_SYNC_DIR"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_CheckDiskSpaceLocal "$TARGET_SYNC_DIR"
	else
		_CheckDiskSpaceRemote "$TARGET_SYNC_DIR"
	fi
}

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

	__CheckArguments 2 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	# 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_from="${1}"
        local pattern_type="${2}"

        __CheckArguments 2 $# $FUNCNAME "$@"    #__WITH_PARANOIA_DEBUG

        ## 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 {
        __CheckArguments 0 $# $FUNCNAME "$@"    #__WITH_PARANOIA_DEBUG

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

function _WriteLockFilesLocal {
	local lockfile="${1}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	$COMMAND_SUDO echo "$SCRIPT_PID@$INSTANCE_ID" > "$lockfile" #TODO: Determine best format for lockfile for v2
	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}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "echo '$SCRIPT_PID@$INSTANCE_ID' | '$COMMAND_SUDO' tee \"'$lockfile'\"" > /dev/null 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd" &
	WaitForTaskCompletion $! 720 1800 $FUNCNAME
	if [ $? != 0 ]; then
		Logger "Could not set lock on remote target replica." "CRITICAL"
		exit 1
	else
		Logger "Locked remote target replica." "DEBUG"
	fi
}

function WriteLockFiles {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	_WriteLockFilesLocal "$INITIATOR_LOCKFILE"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_WriteLockFilesLocal "$TARGET_LOCKFILE"
	else
		_WriteLockFilesRemote "$TARGET_LOCKFILE"
	fi
}

function _CheckLocksLocal {
	local lockfile="${1}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	if [ -f "$lockfile" ]; then
		local lockfile_content=$(cat $lockfile)
		Logger "Master lock pid present: $lockfile_content" "DEBUG"
		local lock_pid=${lockfile_content%@*}
		local lock_instance_id=${lockfile_content#*@}
		ps -p$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]. Cannot start." "CRITICAL"
			exit 1
		fi
	fi
}

function _CheckLocksRemote { #TODO: Rewrite this a bit more beautiful
	local lockfile="${1}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "if [ -f \"'$lockfile'\" ]; then cat \"'$lockfile'\"; fi" > "'$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID'"'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd" &
	WaitForTaskCompletion $! 720 1800 $FUNCNAME
	if [ $? != 0 ]; then
		if [ -f "$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID" ]; then
			local lockfile_content=$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID)
		else
			Logger "Cannot get remote lockfile." "CRITICAL"
			exit 1
		fi
	fi

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

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

		ps -p$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 {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	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_LOCKFILE"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_CheckLocksLocal "$TARGET_LOCKFILE"
	else
		_CheckLocksRemote "$TARGET_LOCKFILE"
	fi

	WriteLockFiles
}

function _UnlockReplicasLocal {
	local lockfile="${1}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	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}"
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	cmd=$SSH_CMD' "if [ -f \"'$lockfile'\" ]; then '$COMMAND_SUDO' rm -f \"'$lockfile'\"; fi" > "'$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID'" 2>&1'
	Logger "cmd: $cmd" "DEBUG"
	eval "$cmd" &
	WaitForTaskCompletion $! 720 1800 $FUNCNAME
	if [ $? != 0 ]; then
		Logger "Could not unlock remote replica." "ERROR"
		Logger "Command Output:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID)" "NOTICE"
	else
		Logger "Removed remote replica lock." "DEBUG"
	fi
}

function UnlockReplicas {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

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

	_UnlockReplicasLocal "$INITIATOR_LOCKFILE"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_UnlockReplicasLocal "$TARGET_LOCKFILE"
	else
		_UnlockReplicasRemote "$TARGET_LOCKFILE"
	fi
}

###### 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)
	__CheckArguments 3 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	local escaped_replica_path=$(EscapeSpaces "$replica_path")

	Logger "Creating $replica_type replica file list [$replica_path]." "NOTICE"
	if [ "$REMOTE_OPERATION" == "yes" ] && [ "$replica_type" == "target" ]; then
		CheckConnectivity3rdPartyHosts
		CheckConnectivityRemoteHost
		rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $RSYNC_ARGS $RSYNC_ATTR_ARGS $RSNYC_TYPE_ARGS -8 --exclude \"$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 $RSNYC_TYPE_ARGS -8 --exclude \"$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: $rsync_cmd" "DEBUG"
	## Redirect commands stderr here to get rsync stderr output in logfile
	eval "$rsync_cmd" 2>> "$LOG_FILE"
	WaitForCompletion $! $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME $FUNCNAME
	retval=$?
	## 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_STATE_DIR/$replica_type$tree_filename"
		return $?
	else
		Logger "Cannot create replica file list." "CRITICAL"
		exit $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
	__CheckArguments 5 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	# TODO: Check why external filenames are used (see _DRYRUN option because of NOSUFFIX)

	Logger "Creating $replica_type replica deleted file list." "NOTICE"
	if [ -f "$INITIATOR_STATE_DIR/$replica_type$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 \"$INITIATOR_STATE_DIR/$replica_type$TREE_AFTER_FILENAME_NO_SUFFIX\" \"$INITIATOR_STATE_DIR/$replica_type$tree_file_current\" > \"$INITIATOR_STATE_DIR/$replica_type$deleted_list_file\""
		else
			## The || : forces the command to have a good result
			cmd="(grep -F -x -v -f \"$INITIATOR_STATE_DIR/$replica_type$tree_file_current\" \"$INITIATOR_STATE_DIR/$replica_type$TREE_AFTER_FILENAME_NO_SUFFIX\" || :) > \"$INITIATOR_STATE_DIR/$replica_type$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 "$INITIATOR_STATE_DIR/$replica_type$deleted_failed_list_file" ]; then
			cat "$INITIATOR_STATE_DIR/$replica_type$deleted_failed_list_file" >> "$INITIATOR_STATE_DIR/$replica_type$deleted_list_file"
			rm -f "$INITIATOR_STATE_DIR/$replica_type$deleted_failed_list_file"
		fi

		return $retval
	else
		touch "$INITIATOR_STATE_DIR/$replica_type$deleted_list_file"
		return $retval
	fi
}

function _get_file_attrs_local {
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG
}

function _get_file_attrs_remote {
	__CheckArguments 1 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG
}

function sync_attrs {
	local initiator_replica="${1}" # Contains #TODO: Write ACL update function, check other ctime related attributes (xattr ?)
	local target_replica="${2}"
	__CheckArguments 2 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	if [ "$REMOTE_OPERATION" == "yes" ]; then
		CheckConnectivity3rdPartyHosts
		CheckConnectivityRemoteHost
		rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" -i $RSYNC_ARGS $RSYNC_ATTR_ARGS $RSYNC_PARTIAL_EXCLUDE -e \"$RSYNC_SSH_CMD\" $BACKUP_DIR --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"$INITIATOR_STATE_DIR/$source_replica$delete_list_filename\" --exclude-from=\"$INITIATOR_STATE_DIR/$destination_replica$delete_list_filename\" \"$initiator_replica/\" $REMOTE_USER@$REMOTE_HOST:\"$target_replica/\" > $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID 2>&1 &"
	else
		rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" -i $RSYNC_ARGS $RSYNC_ATTR_ARGS $RSYNC_PARTIAL_EXCLUDE --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"$INITIATOR_STATE_DIR/$source_replica$delete_list_filename\" --exclude-from=\"$INITIATOR_STATE_DIR/$destination_replica$delete_list_filename\" \"$initiator_replica/\" \"$target_replica/\" > $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID 2>&1 &"
	fi
	Logger "RSYNC_CMD: $rsync_cmd" "DEBUG"
	eval "$rsync_cmd"
	WaitForCompletion $! $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME $FUNCNAME
	retval=$?
	if [ $_VERBOSE -eq 1 ] && [ -f "$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID" ]; then
		Logger "List:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID)" "NOTICE"
	fi

	if [ $retval != 0 ] && [ $retval != 24 ]; then
		Logger "Getting file attributes failed [$retval]. Stopping execution." "CRITICAL"
		if [ $_VERBOSE -eq 0 ] && [ -f "$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID" ]; then
			Logger "Rsync output:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID)" "NOTICE"
		fi
		exit $retval
	else
		cat "$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID" | grep -Ev "^[^ ]*(c|s|t)[^ ]* " | grep -E "^[^ ]*(p|o|g|a)[^ ]* " | sed -e 's/^[^ ]* //' > "$RUN_DIR/$PROGRAM.$FUNCNAME-cleaned.$SCRIPT_PID"
		Logger "Getting file attributes on replicas succeded." "NOTICE"
	fi

	_get_file_attrs_local "$INITIATOR_SYNC_DIR"
	if [ "$REMOTE_OPERATION" != "yes" ]; then
		_get_file_attrs_remote $(EscapeSpaces "$TARGET_SYNC_DIR")
	else
		_get_file_attrs_local "$TARGET_SYNC_DIR"
	fi

	#WIP
	# Join both files into tmp file
	# Rsync file from tmp file

}

# 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
	__CheckArguments 3 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	Logger "Updating $destination_replica replica." "NOTICE"
	if [ "$source_replica" == "initiator" ]; then
		SOURCE_DIR="$INITIATOR_SYNC_DIR"
		ESC_SOURCE_DIR=$(EscapeSpaces "$INITIATOR_SYNC_DIR")
		DEST_DIR="$TARGET_SYNC_DIR"
		ESC_DEST_DIR=$(EscapeSpaces "$TARGET_SYNC_DIR")
		BACKUP_DIR="$TARGET_BACKUP"
	else
		SOURCE_DIR="$TARGET_SYNC_DIR"
		ESC_SOURCE_DIR=$(EscapeSpaces "$TARGET_SYNC_DIR")
		DEST_DIR="$INITIATOR_SYNC_DIR"
		ESC_DEST_DIR=$(EscapeSpaces "$INITIATOR_SYNC_DIR")
		BACKUP_DIR="$INITIATOR_BACKUP"
	fi

	if [ "$REMOTE_OPERATION" == "yes" ]; then
		CheckConnectivity3rdPartyHosts
		CheckConnectivityRemoteHost
		if [ "$source_replica" == "initiator" ]; then
			rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $RSYNC_ARGS $RSYNC_ATTR_ARGS $RSYNC_TYPE_ARGS $SYNC_OPTS -e \"$RSYNC_SSH_CMD\" $BACKUP_DIR --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"$INITIATOR_STATE_DIR/$source_replica$delete_list_filename\" --exclude-from=\"$INITIATOR_STATE_DIR/$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_ATTR_ARGS $RSNYC_TYPE_ARGS $SYNC_OPTS -e \"$RSYNC_SSH_CMD\" $BACKUP_DIR --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"$INITIATOR_STATE_DIR/$destination_replica$delete_list_filename\" --exclude-from=\"$INITIATOR_STATE_DIR/$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_ATTR_ARGS $RSNYC_TYPE_ARGS $SYNC_OPTS $BACKUP_DIR --exclude \"$OSYNC_DIR\" $RSYNC_PATTERNS $RSYNC_PARTIAL_EXCLUDE --exclude-from=\"$INITIATOR_STATE_DIR/$source_replica$delete_list_filename\" --exclude-from=\"$INITIATOR_STATE_DIR/$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"
	WaitForCompletion $! $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME $FUNCNAME
	retval=$?
	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 $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
	__CheckArguments 4 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	## On every run, check wheter the next item is already deleted because it is included in a directory already deleted
	previous_file=""
	OLD_IFS=$IFS
	IFS=$'\r\n'
	for files in $(cat "$INITIATOR_STATE_DIR/$deleted_list_file")
	do
		if [[ "$files" != "$previous_file/"* ]] && [ "$files" != "" ]; then
			if [ "$SOFT_DELETE" != "no" ]; then
				if [ ! -d "$replica_dir$deletion_dir" ]; then
					mkdir -p "$replica_dir$deletion_dir"
					if [ $? != 0 ]; then
						Logger "Cannot create replica deletion directory." "ERROR"
					fi
				fi

				if [ $_VERBOSE -eq 1 ]; then
					Logger "Soft deleting $replica_dir$files" "NOTICE"
				fi

				if [ $_DRYRUN -ne 1 ]; then
					if [ -e "$replica_dir$deletion_dir/$files" ]; then
						rm -rf "${replica_dir:?}$deletion_dir/$files"
					fi
					# In order to keep full path on soft deletion, create parent directories before move
					parentdir="$(dirname "$files")"
					if [ "$parentdir" != "." ]; then
						mkdir --parents "$replica_dir$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_STATE_DIR/$deleted_failed_list_file"
					fi
				fi
			else
				if [ $_VERBOSE -eq 1 ]; then
					Logger "Deleting $replica_dir$files" "NOTICE"
				fi

				if [ $_DRYRUN -ne 1 ]; then
					rm -rf "$replica_dir$files"
					if [ $? != 0 ]; then
						Logger "Cannot delete $replica_dir$files" "ERROR"
						echo "$files" >> "$INITIATOR_STATE_DIR/$deleted_failed_list_file"
					fi
				fi
			fi
			previous_file="$files"
		fi
	done
	IFS=$OLD_IFS
}

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
	__CheckArguments 4 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	## 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_STATE_DIR")"
	rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $SYNC_OPTS -e \"$RSYNC_SSH_CMD\" \"$INITIATOR_STATE_DIR/$2\" $REMOTE_USER@$REMOTE_HOST:\"$ESC_DEST_DIR/\" > $RUN_DIR/$PROGRAM.$FUNCNAME.precopy.$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.precopy.$SCRIPT_PID" ]; then
			Logger "$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.precopy.$SCRIPT_PID)" "ERROR"
		fi
		exit 1
	fi

$SSH_CMD ERROR_ALERT=0 sync_on_changes=$sync_on_changes _SILENT=$_SILENT _DEBUG=$_DEBUG _DRYRUN=$_DRYRUN _VERBOSE=$_VERBOSE COMMAND_SUDO=$COMMAND_SUDO FILE_LIST="$(EscapeSpaces "$TARGET_STATE_DIR/$deleted_list_file")" REPLICA_DIR="$(EscapeSpaces "$replica_dir")" DELETE_DIR="$(EscapeSpaces "$deletion_dir")" FAILED_DELETE_LIST="$(EscapeSpaces "$TARGET_STATE_DIR/$deleted_failed_list_file")" 'bash -s' << 'ENDSSH' > "$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" >> "$LOG_FILE"

		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

		# Special case in daemon mode we should timestamp instead of counting seconds
		if [ $sync_on_changes -eq 1 ]; then
			prefix="$(date) - "
		else
			prefix="RTIME: $SECONDS - "
		fi

		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"

	## On every run, check wheter the next item is already deleted because it is included in a directory already deleted
	previous_file=""
	OLD_IFS=$IFS
	IFS=$'\r\n'
	for files in $(cat "$FILE_LIST")
	do
		if [[ "$files" != "$previous_file/"* ]] && [ "$files" != "" ]; then
			if [ ! -d "$REPLICA_DIR$DELETE_DIR" ]; then
					$COMMAND_SUDO mkdir -p "$REPLICA_DIR$DELETE_DIR"
					if [ $? != 0 ]; then
						Logger "Cannot create replica deletion directory." "ERROR"
					fi
				fi

			if [ "$SOFT_DELETE" != "no" ]; then
				if [ $_VERBOSE -eq 1 ]; then
					Logger "Soft deleting $REPLICA_DIR$files" "NOTICE"
				fi

				if [ $_DRYRUN -ne 1 ]; then
					if [ -e "$REPLICA_DIR$DELETE_DIR/$files" ]; then
						$COMMAND_SUDO rm -rf "$REPLICA_DIR$DELETE_DIR/$files"
					fi
					# In order to keep full path on soft deletion, create parent directories before move
					parentdir="$(dirname "$files")"
					if [ "$parentdir" != "." ]; then
						$COMMAND_SUDO mkdir --parents "$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"1
					fi
					if [ $? != 0 ]; then
						Logger "Cannot move $REPLICA_DIR$files to deletion directory." "ERROR"
						echo "$files" >> "$FAILED_DELETE_LIST"
					fi
				fi
			else
				if [ $_VERBOSE -eq 1 ]; then
					Logger "Deleting $REPLICA_DIR$files" "NOTICE"
				fi

				if [ $_DRYRUN -ne 1 ]; then
					$COMMAND_SUDO rm -rf "$REPLICA_DIR$files"
					if [ $? != 0 ]; then
						Logger "Cannot delete $REPLICA_DIR$files" "ERROR"
						echo "$files" >> "$TARGET_STATE_DIR/$FAILED_DELETE_LIST"
					fi
				fi
			fi
			previous_file="$files"
		fi
	done
	IFS=$OLD_IFS
ENDSSH

	## Need to add a trivial sleep time to give ssh time to log to local file
	sleep 5

	## Copy back the deleted failed file list
	ESC_SOURCE_FILE="$(EscapeSpaces "$TARGET_STATE_DIR/$deleted_failed_list_file")"
	#TODO: Need to check if file exists prior to copy (or add a filemask and copy all state files)
	rsync_cmd="$(type -p $RSYNC_EXECUTABLE) --rsync-path=\"$RSYNC_PATH\" $SYNC_OPTS -e \"$RSYNC_SSH_CMD\" $REMOTE_USER@$REMOTE_HOST:\"$ESC_SOURCE_FILE\" \"$INITIATOR_STATE_DIR\" > \"$RUN_DIR/$PROGRAM.remote_failed_deletion_list_copy.$SCRIPT_PID\""
	Logger "RSYNC_CMD: $rsync_cmd" "DEBUG"
	eval "$rsync_cmd" 2>> "$LOG_FILE"
	if [ $? != 0 ]; then
		Logger "Cannot copy back the failed deletion list to initiator replica." "CRITICAL"
		if [ -f "$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
	fi



	exit $?
}

# 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
	__CheckArguments 3 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

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

	if [ "$replica_type" == "initiator" ]; then
		REPLICA_DIR="$INITIATOR_SYNC_DIR"
		DELETE_DIR="$INITIATOR_DELETE_DIR"

		_delete_local "$REPLICA_DIR" "target$deleted_list_file" "$DELETE_DIR" "target$deleted_failed_list_file" &
		WaitForCompletion $! $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME $FUNCNAME
		retval=$?
		if [ $retval != 0 ]; then
			Logger "Deletion on replica $replica_type failed." "CRITICAL"
			exit 1
		fi
	else
		REPLICA_DIR="$TARGET_SYNC_DIR"
		DELETE_DIR="$TARGET_DELETE_DIR"

		if [ "$REMOTE_OPERATION" == "yes" ]; then
			_delete_remote "$REPLICA_DIR" "initiator$deleted_list_file" "$DELETE_DIR" "initiator$deleted_failed_list_file" &
		else
			_delete_local "$REPLICA_DIR" "initiator$deleted_list_file" "$DELETE_DIR" "initiator$deleted_failed_list_file" &
		fi
		WaitForCompletion $! $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME $FUNCNAME
		retval=$?
		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._delete_remote.$SCRIPT_PID)" "CRITICAL"
			fi
			exit 1
		fi
	fi
}

###### Sync function in 6 steps (functions above)
######
###### Step 1: Create current tree list for initiator and target replicas (Steps 1M and 1S)
###### Step 2: Create deleted file list for initiator and target replicas (Steps 2M and 2S)
###### Step 3a: Update initiator and target file attributes only
###### Step 3b: Update initiator and target replicas (Steps 3M and 3S, order depending on conflict prevalence)
###### Step 4: Deleted file propagation to initiator and target replicas (Steps 4M and 4S)
###### Step 5: Create after run tree list for initiator and target replicas (Steps 5M and 5S)

function Sync {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

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

	if [ -f "$INITIATOR_LAST_ACTION" ] && [ "$RESUME_SYNC" != "no" ]; then
		resume_sync=$(cat "$INITIATOR_LAST_ACTION")
		if [ -f "$INITIATOR_RESUME_COUNT" ]; then
			resume_count=$(cat "$INITIATOR_RESUME_COUNT")
		else
			resume_count=0
		fi

		if [ $resume_count -lt $RESUME_TRY ]; then
			if [ "$resume_sync" != "sync.success" ]; then
				Logger "WARNING: Trying to resume aborted osync execution on $($STAT_CMD "$INITIATOR_LAST_ACTION") at task [$resume_sync]. [$resume_count] previous tries." "WARN"
				echo $(($resume_count+1)) > "$INITIATOR_RESUME_COUNT"
			else
				resume_sync=none
			fi
		else
			Logger "Will not resume aborted osync execution. Too many resume tries [$resume_count]." "WARN"
			echo "noresume" > "$INITIATOR_LAST_ACTION"
			echo "0" > "$INITIATOR_RESUME_COUNT"
			resume_sync=none
		fi
	else
		resume_sync=none
	fi


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

	## This replaces the case statement because ;& operator is not supported in bash 3.2... Code is more messy than case :(
	if [ "$resume_sync" == "none" ] || [ "$resume_sync" == "noresume" ] || [ "$resume_sync" == "${SYNC_ACTION[0]}.fail" ]; then
		#initiator_tree_current
		tree_list "$INITIATOR_SYNC_DIR" initiator "$TREE_CURRENT_FILENAME"
		if [ $? == 0 ]; then
			echo "${SYNC_ACTION[0]}.success" > "$INITIATOR_LAST_ACTION"
		else
			echo "${SYNC_ACTION[0]}.fail" > "$INITIATOR_LAST_ACTION"
		fi
		resume_sync="resumed"
	fi
	if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[0]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[1]}.fail" ]; then
		#target_tree_current
		tree_list "$TARGET_SYNC_DIR" target "$TREE_CURRENT_FILENAME"
		if [ $? == 0 ]; then
			echo "${SYNC_ACTION[1]}.success" > "$INITIATOR_LAST_ACTION"
		else
			echo "${SYNC_ACTION[1]}.fail" > "$INITIATOR_LAST_ACTION"
		fi
		resume_sync="resumed"
	fi
	if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[1]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[2]}.fail" ]; then
		delete_list initiator "$TREE_AFTER_FILENAME" "$TREE_CURRENT_FILENAME" "$DELETED_LIST_FILENAME" "$FAILED_DELETE_LIST_FILENAME"
		if [ $? == 0 ]; then
			echo "${SYNC_ACTION[2]}.success" > "$INITIATOR_LAST_ACTION"
		else
			echo "${SYNc_ACTION[2]}.fail" > "$INITIATOR_LAST_ACTION"
		fi
		resume_sync="resumed"
	fi
	if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[2]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[3]}.fail" ]; then
		delete_list target "$TREE_AFTER_FILENAME" "$TREE_CURRENT_FILENAME" "$DELETED_LIST_FILENAME" "$FAILED_DELETE_LIST_FILENAME"
		if [ $? == 0 ]; then
			echo "${SYNC_ACTION[3]}.success" > "$INITIATOR_LAST_ACTION"
		else
			echo "${SYNC_ACTION[3]}.fail" > "$INITIATOR_LAST_ACTION"
		fi
		resume_sync="resumed"
	fi
	if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[3]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[4]}.fail" ]; then
		sync_attrs "$INITIATOR_SYNC_DIR" "$TARGET_SYNC_DIR"
		if [ $? == 0 ]; then
			echo "${SYNC_ACTION[4]}.success" > "$INITIATOR_LAST_ACTION"
		else
			echo "${SYNC_ACTION[4]}.fail" > "$INITIATOR_LAST_ACTION"
		fi
		resume_sync="resumed"
	fi
	if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[4]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[5]}.fail" ] || [ "$resume_sync" == "${SYNC_ACTION[6]}.fail" ] || [ "$resume_sync" == "${SYNC_ACTION[5]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[6]}.success" ]; then
		if [ "$CONFLICT_PREVALANCE" != "initiator" ]; then
			if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[4]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[5]}.fail" ]; then
				sync_update target initiator "$DELETED_LIST_FILENAME"
				if [ $? == 0 ]; then
					echo "${SYNC_ACTION[5]}.success" > "$INITIATOR_LAST_ACTION"
				else
					echo "${SYNC_ACTION[5]}.fail" > "$INITIATOR_LAST_ACTION"
				fi
				resume_sync="resumed"
			fi
			if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[5]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[6]}.fail" ]; then
				sync_update initiator target "$DELETED_LIST_FILENAME"
				if [ $? == 0 ]; then
					echo "${SYNC_ACTION[6]}.success" > "$INITIATOR_LAST_ACTION"
				else
					echo "${SYNC_ACTION[6]}.fail" > "$INITIATOR_LAST_ACTION"
				fi
				resume_sync="resumed"
			fi
		else
			if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[4]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[6]}.fail" ]; then
				sync_update initiator target "$DELETED_LIST_FILENAME"
				if [ $? == 0 ]; then
					echo "${SYNC_ACTION[6]}.success" > "$INITIATOR_LAST_ACTION"
				else
					echo "${SYNC_ACTION[6]}.fail" > "$INITIATOR_LAST_ACTION"
				fi
				resume_sync="resumed"
			fi
			if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[6]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[5]}.fail" ]; then
				sync_update target initiator "$DELETED_LIST_FILENAME"
				if [ $? == 0 ]; then
					echo "${SYNC_ACTION[5]}.success" > "$INITIATOR_LAST_ACTION"
				else
					echo "${SYNC_ACTION[5]}.fail" > "$INITIATOR_LAST_ACTION"
				fi
				resume_sync="resumed"
			fi
		fi
	fi
	if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[5]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[6]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[7]}.fail" ]; then
		deletion_propagation target "$DELETED_LIST_FILENAME" "$FAILED_DELETE_LIST_FILENAME"
		if [ $? == 0 ]; then
			echo "${SYNC_ACTION[7]}.success" > "$INITIATOR_LAST_ACTION"
		else
			echo "${SYNC_ACTION[7]}.fail" > "$INITIATOR_LAST_ACTION"
		fi
		resume_sync="resumed"
	fi
	if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[7]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[8]}.fail" ]; then
		deletion_propagation initiator "$DELETED_LIST_FILENAME" "$FAILED_DELETE_LIST_FILENAME"
		if [ $? == 0 ]; then
			echo "${SYNC_ACTION[8]}.success" > "$INITIATOR_LAST_ACTION"
		else
			echo "${SYNC_ACTION[8]}.fail" > "$INITIATOR_LAST_ACTION"
		fi
		resume_sync="resumed"
	fi
	if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[8]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[9]}.fail" ]; then
		#initiator_tree_after
		tree_list "$INITIATOR_SYNC_DIR" initiator "$TREE_AFTER_FILENAME"
		if [ $? == 0 ]; then
			echo "${SYNC_ACTION[9]}.success" > "$INITIATOR_LAST_ACTION"
		else
			echo "${SYNC_ACTION[9]}.fail" > "$INITIATOR_LAST_ACTION"
		fi
		resume_sync="resumed"
	fi
	if [ "$resume_sync" == "resumed" ] || [ "$resume_sync" == "${SYNC_ACTION[9]}.success" ] || [ "$resume_sync" == "${SYNC_ACTION[10]}.fail" ]; then
		#target_tree_after
		tree_list "$TARGET_SYNC_DIR" target "$TREE_AFTER_FILENAME"
		if [ $? == 0 ]; then
			echo "${SYNC_ACTION[10]}.success" > "$INITIATOR_LAST_ACTION"
		else
			echo "${SYNC_ACTION[10]}.fail" > "$INITIATOR_LAST_ACTION"
		fi
		resume_sync="resumed"
	fi

	Logger "Finished synchronization task." "NOTICE"
	echo "${SYNC_ACTION[11]}" > "$INITIATOR_LAST_ACTION"

	echo "0" > "$INITIATOR_RESUME_COUNT"
}

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}"
	__CheckArguments 3 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	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
			$FIND_CMD "$replica_deletion_path/" -type f -ctime +$change_time -print0 | xargs -0 -I {} echo "Will delete file {}" > "$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID"
			Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID)" "NOTICE"
			$FIND_CMD "$replica_deletion_path/" -type d -empty -ctime +$change_time -print0 | xargs -0 -I {} echo "Will delete directory {}" > "$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID"
			Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID)" "NOTICE"
		fi
			if [ $_DRYRUN -ne 1 ]; then
			$FIND_CMD "$replica_deletion_path/" -type f -ctime +$change_time -print0 | xargs -0 -I {} rm -f "{}" && $FIND_CMD "$replica_deletion_path/" -type d -empty -ctime +$change_time -print0 | xargs -0 -I {} rm -rf "{}" > "$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID" 2>&1 &
		else
			Dummy &
		fi
		WaitForCompletion $! $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME $FUNCNAME
		retval=$?
		if [ $retval -ne 0 ]; then
			Logger "Error while executing cleanup on $replica_type replica." "ERROR"
			Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$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}"
	__CheckArguments 3 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	CheckConnectivity3rdPartyHosts
	CheckConnectivityRemoteHost

	if [ $_DRYRUN -eq 1 ]; then
		Logger "Listing files older than $change_time days on target replica. Does not remove anything." "NOTICE"
	else
		Logger "Removing files older than $change_time days on target 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 +'$change_time' -print0 | xargs -0 -I {} echo Will delete file {} && '$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.\"; exit 1; fi" > "'$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID'" 2>&1'
		Logger "cmd: $cmd" "DEBUG"
		eval "$cmd" &
		WaitForCompletion $! $SOFT_MAX_EXEC_TIME $HARD_MAX_EXEC_TIME $FUNCNAME
		Logger "Command output:\n$(cat $RUN_DIR/$PROGRAM.$FUNCNAME.$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 +'$change_time' -print0 | xargs -0 -I {} rm -f \"{}\" && '$REMOTE_FIND_CMD' \"'$replica_deletion_path'/\" -type d -empty -ctime '$change_time' -print0 | xargs -0 -I {} rm -rf \"{}\"; else echo \"No remote backup/deletion directory.\"; fi" > "'$RUN_DIR/$PROGRAM.$FUNCNAME.$SCRIPT_PID'" 2>&1'

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

function SoftDelete {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

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

		_SoftDeleteLocal "intiator" "$INITIATOR_SYNC_DIR$INITIATOR_BACKUP_DIR" $CONFLICT_BACKUP_DAYS
		if [ "$REMOTE_OPERATION" != "yes" ]; then
			_SoftDeleteLocal "target" "$TARGET_SYNC_DIR$TARGET_BACKUP_DIR" $CONFLICT_BACKUP_DAYS
		else
			_SoftDeleteRemote "target" "$TARGET_SYNC_DIR$TARGET_BACKUP_DIR" $CONFLICT_BACKUP_DAYS
		fi
	fi

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

		_SoftDeleteLocal "initiator" "$INITIATOR_SYNC_DIR$INITIATOR_DELETE_DIR" $SOFT_DELETE_DAYS
		if [ "$REMOTE_OPERATION" != "yes" ]; then
			_SoftDeleteLocal "target" "$TARGET_SYNC_DIR$TARGET_DELETE_DIR" $SOFT_DELETE_DAYS
		else
			_SoftDeleteRemote "target" "$TARGET_SYNC_DIR$TARGET_DELETE_DIR" $SOFT_DELETE_DAYS
		fi
	fi
}

function Init {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	# 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 SIGINT SIGKILL SIGHUP SIGTERM SIGQUIT
		trap TrapQuit SIGKILL EXIT
	else
		trap TrapQuit SIGTERM EXIT SIGKILL SIGHUP SIGQUIT
	fi

	## 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%/}/"

	INITIATOR_STATE_DIR="$INITIATOR_SYNC_DIR$OSYNC_DIR/state"
	TARGET_STATE_DIR="$TARGET_SYNC_DIR$OSYNC_DIR/state"
	STATE_DIR="$OSYNC_DIR/state"
	INITIATOR_LOCKFILE="$INITIATOR_STATE_DIR/lock"
	TARGET_LOCKFILE="$TARGET_STATE_DIR/lock"

	## Working directories to keep backups of updated / deleted files
	INITIATOR_BACKUP_DIR="$OSYNC_DIR/backups"
	INITIATOR_DELETE_DIR="$OSYNC_DIR/deleted"
	TARGET_BACKUP_DIR="$OSYNC_DIR/backups"
	TARGET_DELETE_DIR="$OSYNC_DIR/deleted"

	## Partial downloads dirs
	PARTIAL_DIR=$OSYNC_DIR"_partial"

	## TODO: checksum=no / yes not implemented, be careful with sync_attrs which must itemize based on mtime

	## 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

	## Conflict options
	if [ "$CONFLICT_BACKUP" != "no" ]; then
		INITIATOR_BACKUP="--backup --backup-dir=\"$INITIATOR_BACKUP_DIR\""
		TARGET_BACKUP="--backup --backup-dir=\"$TARGET_BACKUP_DIR\""
		if [ "$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

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

	## Filenames for state files
	if [ $_DRYRUN -eq 1 ]; then
		dry_suffix="-dry"
	fi

	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$dry_suffix"
	INITIATOR_LAST_ACTION="$INITIATOR_STATE_DIR/last-action-$INSTANCE_ID$dry_suffix"
	INITIATOR_RESUME_COUNT="$INITIATOR_STATE_DIR/resume-count-$INSTANCE_ID$dry_suffix"

	## Sync function actions (0-10)
	SYNC_ACTION=(
	'initiator-replica-tree'
	'target-replica-tree'
	'initiator-deleted-list'
	'target-deleted-list'
	'sync-attrs'
	'update-initiator-replica'
	'update-target-replica'
	'delete-propagation-target'
	'delete-propagation-initiator'
	'initiator-replica-tree-after'
	'target-replica-tree-after'
	'sync.success'
	)
}

function Main {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	CreateStateDirs
	CheckLocks
	Sync
}

function Usage {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	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 {
	__CheckArguments 0 $# $FUNCNAME "$@"	#__WITH_PARANOIA_DEBUG

	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 ]; then
			Logger "osync child exited with error." "CRITICAL"
			exit $retval
		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" "$INITIATOR_SYNC_DIR" &
		OSYNC_SUB_PID=$!
		wait $OSYNC_SUB_PID
		retval=$?
		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

}

stats=0
PARTIAL=0
FORCE_UNLOCK=0
no_maxtime=0
# Alert flags
opts=""
soft_alert_total=0
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
		;;
		--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_$INSTANCE_ID.log
		else
			LOG_FILE=./$PROGRAM_$INSTANCE_ID.log
		fi
	else
		LOG_FILE="$LOGFILE"
	fi

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

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

	if [ $sync_on_changes -eq 1 ]; then
		SyncOnChanges
	else
		DATE=$(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 [ $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
		RunAfterHook
	fi