# backup configs
BackupDirList="/etc /usr/syno/etc /var /usr/syno/synoman/webman/3rdparty /usr/local /root/.ssh /usr/syno/selfcheck/packages"
BackupSubDirList="/etc/nginx/sites-enabled /etc/postgresql/user.conf.d"
RemoveUPSFiles="/usr/syno/etc/ups.conf /usr/syno/etc/upsd.conf /usr/syno/etc/upsd.users /usr/syno/etc/upsmon.conf /usr/syno/etc/upssched.conf"
RemovePPPOEFiles="/etc/ppp/ip-up /etc/ppp/ip-down /etc/ppp/ip-function /etc/ppp/ipv6-up /etc/ppp/ipv6-down /etc/ppp/options"
RemoveCUPSFilters="/usr/local/cups/filter/bannertops /usr/local/cups/filter/commandtops /usr/local/cups/filter/gziptoany /usr/local/cups/filter/imagetops /usr/local/cups/filter/imagetoraster /usr/local/cups/filter/pdftops /usr/local/cups/filter/pstops /usr/local/cups/filter/rastertoepson /usr/local/cups/filter/rastertohp /usr/local/cups/filter/rastertolabel /usr/local/cups/filter/rastertopwg /usr/local/cups/filter/texttops /usr/local/cups/filter/hpgltops"
RemoveCUPSFiles="/usr/local/cups/mime.types /usr/local/cups/mime.convs /etc/cups/cupsd.conf /usr/local/cups/cupsd.conf /usr/local/cups/testprint ${RemoveCUPSFilters}"
RemoveHostapdFiles="/etc/hostapd/stainfo.sh /etc/hostapd/mac_filter/mfscript.sh /usr/syno/etc/rfkill.sh"
RemoveSSLFiles="/usr/syno/etc/ssl/mkcert.sh /usr/syno/etc/ssl/mkcgikey.sh"
RemoveUSBModemFiles="/usr/syno/etc/usbmodem/wcdma_list.json /usr/syno/etc/usbmodem/usb_modeswitch.d/*"
RemovePHPFiles="/etc/php/php.ini /etc/php/php-fpm.conf /etc/php/conf.d/opcache.ini"
RemoveSynoServiceConf="/usr/syno/etc/synoservice.d/global.setting /usr/syno/etc/synoservice.d/system.cfg"
RemoveFileList="/etc/ftpusers /etc/rc /etc/rc.network /usr/syno/etc/rc.atalk /usr/syno/etc/.htpasswd /usr/syno/etc/lpd/lpd.conf /usr/syno/etc/printcap ${RemoveUPSFiles} /etc/lvm/lvm.conf /usr/local/etc/rc.d/SynoEnablePersonalServices.sh /etc/rc.network_routing /usr/syno/etc/rc.tun /usr/syno/etc/afpd.conf /etc/pam.d/samba ${RemovePPPOEFiles} ${RemoveCUPSFiles} ${RemoveHostapdFiles} /usr/syno/etc/iptables_guest_net.sh /etc/ld.so.preload /etc/tc/default.cmd $RemoveSSLFiles /etc/logrotate.conf $RemoveUSBModemFiles $RemovePHPFiles $RemoveSynoServiceConf /usr/syno/etc/ssdp/dsm_desc.xml /usr/syno/etc/iptables_time_ctrl.sh /etc/profile /etc/inputrc /etc/dhclient/dhclient-script /etc/dhclient/ipv4/dhclient.conf /etc/dhclient/ipv6/dhclient.conf /usr/syno/etc/www/SSLProfile.json /etc/vimrc /usr/syno/etc/cacert.pem /usr/syno/etc/iptables_modules_list /usr/syno/etc/iptables_chain_list /usr/local/bin/python* /etc/sudoers /usr/syno/etc/autoupdate.notify /usr/syno/etc/hybrid_ha_model_groups.list"
RemoveCUPSDir="/usr/local/cups/backend /usr/local/cups/mime"
RemoveDirList="/etc/pam.d /usr/syno/etc/vfs /var/run /var/update /var/state/ups /usr/syno/etc/ups /var/spool/postfix ${RemoveCUPSDir} /etc/fw_security/sysconf /etc/init /etc/logrotate.d /etc/syslog-ng /var/lib/dpkg /etc/httpd/conf /etc/postgresql /etc/nginx /etc/wide-dhcpv6 /etc/apparmor.d /usr/syno/etc/synoservice.d /var/dynlib /etc/iproute2/script /etc/ssl/certs /etc/dbus-1 /usr/syno/etc/dbus-1 /etc/avahi /usr/syno/etc/synovpnclient/scripts /var/lib/apparmor /usr/syno/etc/www/app.d /usr/syno/etc/rc.d /usr/syno/etc/bluetooth/ /usr/syno/etc/smallupdate_patch /etc/ImageMagick-6 /usr/syno/etc/logcollector /var/cache/texts /var/lib/drive-bundle/firmware"
# list of folders who will be preserved util bootup finished
UpdateBackupDirList="/usr/syno/etc/synoservice.d /usr/syno/etc/timebkp /var/run"

# _fileIsAppendOnly File
_fileIsAppendOnly() {
	if [ ! -e "$1" -o ! -f "$1" ]; then
		/bin/echo "Failed to check file attribute: '$1' is not valid file"
		return 1
	fi

	local File="$1"

	# "-----a-------e-- /tmp/main.c" split space
	# "-----a-------e--"             check if 'a' exist
	lsattr "$File" | grep -o '^[^\ ]*\ ' | grep -q 'a'

	return $?
}

# _getAppendOnlyFiles RootMnt
_getAppendOnlyFiles() {
	if [ -z "$1" -o ! -d "$1" ]; then
		/bin/echo "Failed to query append only config: '$1' is not valid directory" >&2
		return 1
	fi

	local Root="$1"

	local RmLog="${Root}/var/log/rm.log"
	local RmLogRotationPattern="${Root}/var/log/rm.log.[0-9]*.xz"

	local RmLogAndRotations=$(ls -d ${RmLog} ${RmLogRotationPattern} 2>/dev/null)
	for f in ${RmLogAndRotations}; do
		if _fileIsAppendOnly "$f"; then
			echo "$f"
		fi
	done
}

# BackupExtraConfig RootMnt
BackupExtraConfig() {
	if [ -z "$1" -o ! -d $1 ]; then
		/bin/echo "Failed to backup extra config: Wrong Parameters"
		return 1
	fi

	local UPDATE_BKPDIR="$1/.syno/update_bkp"
	# backup file which will be override after untar hda1
	/bin/rm -rf ${UPDATE_BKPDIR}
	for TargetDir in ${UpdateBackupDirList}; do
		[ ! -e $1/$TargetDir ] && continue
		/bin/echo "$1/$TargetDir ==>    ${UPDATE_BKPDIR}/$TargetDir/"
		local TargetPrefix=`dirname ${TargetDir}`
		/bin/mkdir -p ${UPDATE_BKPDIR}/${TargetPrefix}
		/bin/cp -a $1/$TargetDir ${UPDATE_BKPDIR}/${TargetDir}
	done
}

# BackupConfig RootMnt DataMnt
BackupConfig() {
	if [ -z "$1" -o -z "$2" -o ! -d $1 -o ! -d $2 ]; then
		/bin/echo "Failed to backup config: Wrong Parameters"
		return 1
	fi

	local BKPDIR="$2/.upd@te"
	local BKPSUBDIR="$2/.upd@te_sub"
	# backup configs whose parent directory will be removed
	for ConfigSubDir in ${BackupSubDirList}; do
		if [ ! -d "$1/${ConfigSubDir}" ]; then
			continue
		fi
		/bin/echo "$1/$ConfigSubDir ->	${BKPSUBDIR}${ConfigSubDir}/"
		/bin/mkdir -p ${BKPSUBDIR}/${ConfigSubDir}
		/bin/echo n | /bin/mv -i $1/$ConfigSubDir/* ${BKPSUBDIR}/${ConfigSubDir}/ 2> /dev/null
		/bin/echo n | /bin/mv -i $1/$ConfigSubDir/.[^.]* ${BKPSUBDIR}/${ConfigSubDir}/ 2> /dev/null
	done
	# backup user configs before upgrading
	for ConfigDir in ${BackupDirList}; do
		if [ ! -d "$1/${ConfigDir}" ]; then
			continue
		fi
		/bin/echo "$1/$ConfigDir ->	${BKPDIR}${ConfigDir}/"
		/bin/mkdir -p ${BKPDIR}/${ConfigDir}
		/bin/echo n | /bin/mv -i $1/$ConfigDir/* ${BKPDIR}/${ConfigDir}/ 2> /dev/null
		/bin/echo n | /bin/mv -i $1/$ConfigDir/.[^.]* ${BKPDIR}/${ConfigDir}/ 2> /dev/null
	done

	# remove need-to-upgrade files
	for RemovalFile in ${RemoveFileList}; do
		/bin/echo "Removing ${BKPDIR}/${RemovalFile}..."
		/bin/rm -f ${BKPDIR}/${RemovalFile}
	done

	# remove need-to-upgrade dir
	for RemovalDir in ${RemoveDirList}; do
		/bin/echo "Removing ${BKPDIR}/${RemovalDir}..."
		/bin/rm -rf ${BKPDIR}/${RemovalDir}
	done
}

# RestoreConfig RootMnt DataMnt IsSameDevice
RestoreConfig() {
	if [ -z "$1" -o -z "$2" -o -z "$3" ]; then
		/bin/echo "Failed to restore config: Wrong Parameters"
		return 1
	fi

	local BKPDIR="$2/.upd@te"
	local BKPSUBDIR="$2/.upd@te_sub"

	local AppendOnlyFilesInDataMnt="$(_getAppendOnlyFiles $BKPDIR)"

	/bin/echo "temporarily remove +a flag from files in backup dir:"
	for f in ${AppendOnlyFilesInDataMnt}; do
		/bin/echo "  remove +a from $f"
		chattr -a "$f"
	done

	# copy backed-up config files
	if [ "$3" = "yes" ]; then
		/bin/cp -alf ${BKPDIR}/* $1/
		/bin/cp -alf ${BKPSUBDIR}/* $1/
	else
		if [ -f ${BKPDIR}/etc/passwd -a -h $1/etc/passwd ]; then
			/bin/rm -f $1/etc/passwd
		fi
		if [ -f ${BKPDIR}/etc/group -a -h $1/etc/group ]; then
			/bin/rm -f $1/etc/group
		fi
		/bin/cp -af ${BKPDIR}/* $1/
		/bin/cp -af ${BKPSUBDIR}/* $1/
	fi

	# remove backup config files
	/bin/rm -rf ${BKPDIR}
	/bin/rm -rf ${BKPSUBDIR}

	/bin/echo "restore +a attribute after config restored:"
	for f in ${AppendOnlyFilesInDataMnt}; do
		# remove "/tmpMnt" from "/tmpMnt/.upd@te/var/log.rm.log" to "/var/log.rm.log"
		RelativePath=${f#$BKPDIR}

		f="$1/$RelativePath"

		/bin/echo "  restore +a for $f"
		chattr +a ${f}
	done
}