Thank you. Merged.

On Sat, 2018-02-10 at 12:14 +0000, Jonatan Schlag wrote:
> We now only start radvd when we write a config for a zone into the config
> file.
> 
> Fixes: #11450
> 
> Signed-off-by: Jonatan Schlag <jonatan.schlag(a)ipfire.org>
> ---
>  src/functions/functions.radvd | 39 ++++++++++++++++++++++++---------------
>  1 file changed, 24 insertions(+), 15 deletions(-)
> 
> diff --git a/src/functions/functions.radvd b/src/functions/functions.radvd
> index 4e41160..1c8b8d0 100644
> --- a/src/functions/functions.radvd
> +++ b/src/functions/functions.radvd
> @@ -23,16 +23,16 @@ RADVD_CONFIGFILE="/etc/radvd.conf"
>  
>  radvd_update() {
>  	# (Re-)write the configuration file
> -	radvd_write_config
> -
> -	# Reload the radvd service if it is already running
> -	if service_is_active radvd; then
> -		service_reload radvd
> -		return ${EXIT_OK}
> +	if radvd_write_config; then
> +		# Reload the radvd service if it is already running
> +		if service_is_active radvd; then
> +			service_reload radvd
> +			return ${EXIT_OK}
> +		fi
> +
> +		# Start the radvd service
> +		service_start radvd
>  	fi
> -
> -	# Start the radvd service
> -	service_start radvd
>  }
>  
>  radvd_clear_config() {
> @@ -48,14 +48,21 @@ radvd_write_config() {
>  
>  	# Write the configuration for all zones.
>  	local zone
> -	for zone in $(zones_get_local); do
> -		__radvd_config_interface ${zone}
>  
> +	# The return value determine if radvd is started or not
> +	local return_value=${EXIT_FALSE}
> +
> +	for zone in $(zones_get_local); do
> +		if __radvd_config_interface ${zone}; then
> +			# We return TRUE when __radvd_config_interface returns True
> +			return_value=${EXIT_TRUE}
> +		fi
>  	done >> ${RADVD_CONFIGFILE}
>  
> -	return ${EXIT_OK}
> +	return ${return_value}
>  }
>  
> +# This function return ${EXIT_FALSE} if no radvd config was written and ${EXIT_TRUE} in all other cases
>  __radvd_config_interface() {
>  	local zone=${1}
>  	assert isset zone
> @@ -65,17 +72,17 @@ __radvd_config_interface() {
>  	# If the interface does not provide any routing information,
>  	# we can skip this whole stuff.
>  	if ! db_exists "${zone}/ipv6"; then
> -		return ${EXIT_OK}
> +		return ${EXIT_FALSE}
>  	fi
>  
>  	# Skip if zone is not active.
>  	local active="$(db_get "${zone}/ipv6/active")"
> -	[ "${active}" = "0" ] && return ${EXIT_OK}
> +	[ "${active}" = "0" ] && return ${EXIT_FALSE}
>  
>  	# Skip if there is no prefix or prefix is link-local.
>  	local addr="$(db_get "${zone}/ipv6/local-ip-address")"
>  	if [ -z "${addr}" ] || [ "${addr:0:5}" = "fe80:" ]; then
> -		return ${EXIT_OK}
> +		return ${EXIT_FALSE}
>  	fi
>  
>  	# Check if the subnet is configured by the DHCP server.
> @@ -116,6 +123,8 @@ __radvd_config_interface() {
>  
>  	print "};"
>  	print
> +
> +	return ${EXIT_TRUE}
>  }
>  
>  __radvd_config_dns() {