patch_tftpd-hpa_config() {
	echo "# Stopping tftpd-hpa server in case it's not managed by inetd... "
	systemctl stop tftpd-hpa || perror "Failed"
	# No sense in patching, we will drop this little entry.
	echo "# Copying tftpd-hpa configuration... "
	cp -p "$BASEDIR/static_files/tftpd/tftpd-hpa" "/etc/default/tftpd-hpa" || perror "failed"
	echo "# Copying remap file... "
	mkdir -p "/opt/openslx"
	cp -p "$BASEDIR/static_files/tftpd/tftpd-remap" "/opt/openslx/tftpd-remap" || perror "failed"
	# sometimes a tftp stating line remains in /etc/inetd.conf. Let's have a look and kill this interesting line:
	echo -n "# Checking /etc/inetd.conf for a tftp entry... "
	if [ -f /etc/inetd.conf ]; then
		if [ "$(grep -c "^tftp.*dgram.*udp4" /etc/inetd.conf)" -gt 0 ]; then
			echo -n " found. Deleting... "
			sed -i '/^tftp.*dgram.*udp4/d' /etc/inetd.conf
			echo " ok."
		else
			echo " no entry found."
		fi
	else
		echo " no /etc/inetd.conf found."
	fi	
}

copy_tftpd-hpa_service() {
	echo "# Copying tftpd-hpa service file... "
	cp -p "$BASEDIR/static_files/tftpd/tftpd-hpa.service" "/etc/systemd/system/tftpd-hpa.service" || perror "failed"
	echo -n "# Linking tftpd-hpa service file into (/etc/systemd/system/)multi-user.target.wants... "
	ln -s ../tftpd-hpa.service /etc/systemd/system/multi-user.target.wants/tftpd-hpa.service \
		&& echo "ok." || perror "Could not link tftpd-hpa service file into multiuser target!"
}

patch_lighttpd_config() {
	local mod file
	service lighttpd stop
	echo "# Customizing lighttpd config"
	cp -p "$BASEDIR/static_files/lighttpd.conf" /etc/lighttpd/lighttpd.conf || perror "failed."
	cp -p "$BASEDIR/static_files/lighttpd-auto-ssl.sh" /usr/share/lighttpd/auto-ssl.sh || perror "failed."
	cp -p "$BASEDIR/static_files/lighttpd-include-conf-d.sh" /usr/share/lighttpd/include-conf-d.sh || perror "failed."
	cp -a "$BASEDIR/static_files/patch_lighttpd_phpchildren" /usr/local/sbin/patch_lighttpd_phpchildren || perror "failed."
	chmod +x /usr/share/lighttpd/auto-ssl.sh || perror "failed"
	chmod +x /usr/share/lighttpd/include-conf-d.sh || perror "failed"
	chmod +x /usr/local/sbin/patch_lighttpd_phpchildren || perror "failed"
	for mod in fastcgi fastcgi-php; do
		file=$(echo /etc/lighttpd/conf-available/??-${mod}.conf) # expand ??
		[ -f "$file" ] || perror "Could not find path for $mod"
		file=$(basename "$file")
		ln -sf "../conf-available/$file" "/etc/lighttpd/conf-enabled/$file" || perror "Could not enable module $mod"
	done

	# Increase php threads (set dynamically)
	mkdir -p /etc/systemd/system/lighttpd.service.d || perror "Could not create /etc/systemd/system/lighttpd.service.d"
	cat > "/etc/systemd/system/lighttpd.service.d/10-dynamic_php_children.conf" <<-HDOC
		[Service]
		ExecStartPre=/usr/local/sbin/patch_lighttpd_phpchildren
	HDOC
	mkdir -p "$WWWDIR" || perror "Could not create www-dir ($WWWDIR)"
}

patch_php_config() {
	echo -n "# Patching php configuration... "

	if [ $(ls -d /etc/php/*/|wc -l) -eq 1 ]; then
		local PHPINIFILE="$(ls -d /etc/php/*/)/cgi/php.ini"
	fi
		pwarning "No php ini file found - or more than one."
	fi

	if [ -f "$PHPINIFILE" ]; then
		grep -E "^\s*upload_max_filesize" "$PHPINIFILE" # 2>/dev/null 1>&2
		
		if [ "$?" -eq 0 ]; then
			echo -n "upload_max_filesize entry found; patching to 100M... "
			sed -i.sik -e '/^\s*upload_max_filesize/c\upload_max_filesize = 100M' "$PHPINIFILE"
		else
			echo -n "no upload_max_filesize entry found; appending 100M entry... "
			echo "upload_max_filesize = 100M" >> "$PHPINIFILE"
		fi

		if grep -q -E '^\s*post_max_size' "$PHPINIFILE"; then
			sed -i -e '/^\s*post_max_size/c\post_max_size = 100M' "$PHPINIFILE" || pwarning "Could not increase PHP upload limit"
		else
			echo "post_max_size = 100M" >> "$PHPINIFILE" || pwarning "Could not increase PHP upload limit"
		fi

		echo "ok."
		service lighttpd reload
	else
		echo "php ini file (${PHPINIFILE}) not found."
		pwarning "Could not patch php ini file. Please check manually and make sure upload_max_filesize is appropriately set (50-100MB)."
	fi
}

config_nfs() {
	echo -n "# Patching /etc/exports for NFS... "
	if [ $(grep -c "/srv/openslx/nfs" /etc/exports) -gt 0 ]; then
		echo -n "NFS entry already there; doing nothing."
	else
		echo '/srv/openslx/nfs   *(ro,async,insecure,no_root_squash,no_subtree_check)'  >> /etc/exports
		echo "ok."
	fi
	mkdir -p /srv/openslx/nfs 2>/dev/null
	chown dmsd:images /srv/openslx/nfs
	chmod 775 /srv/openslx/nfs
}

write_apt_config() {
	echo -n "# Configuring apt unattended/periodic updates... "
	cp "$BASEDIR/static_files/system/apt-upgrade-conf" "/etc/apt/apt.conf.d/02periodic" && echo " done." || pwarning "failed."
}