It is senseless to configure the ipv6-auto hook
multiple times for a zone.

Signed-off-by: Jonatan Schlag <jonatan.schlag(a)ipfire.org>
---
 src/hooks/configs/ipv6-auto | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/hooks/configs/ipv6-auto b/src/hooks/configs/ipv6-auto
index 44cef48..c362797 100644
--- a/src/hooks/configs/ipv6-auto
+++ b/src/hooks/configs/ipv6-auto
@@ -34,6 +34,11 @@ hook_new() {
 	local zone="${1}"
 	shift
 
+	if zone_config_hook_is_configured ${zone} "ipv6-auto"; then
+		log ERROR "You can configure the ipv6-auto hook only once for a zone"
+		return ${EXIT_ERROR}
+	fi
+
 	while read arg; do
 		case "${arg}" in
 			--privacy-extensions=*)
-- 
2.6.3