It is senseless to configure the ipv4-dhcp hook
multiple times for a zone.

Signed-off-by: Jonatan Schlag <jonatan.schlag(a)ipfire.org>
---
 src/hooks/configs/ipv4-dhcp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/hooks/configs/ipv4-dhcp b/src/hooks/configs/ipv4-dhcp
index ef23082..39e0312 100644
--- a/src/hooks/configs/ipv4-dhcp
+++ b/src/hooks/configs/ipv4-dhcp
@@ -35,6 +35,11 @@ hook_new() {
 	local zone="${1}"
 	shift
 
+	if zone_config_hook_is_configured ${zone} "ipv4-dhcp"; then
+		log ERROR "You can configure the ipv4-dhcp hook only once for a zone"
+		return ${EXIT_ERROR}
+	fi
+
 	while [ $# -gt 0 ]; do
 		case "${1}" in
 			--delay=*)
-- 
2.6.3