Check if CONTAINER_IP could be determined (#2046)

Co-authored-by: Georg Lauterbach <44545919+georglauterbach@users.noreply.github.com>

target/scripts/helper-functions.sh

@@ -208,3 +208,9 @@ function _monitored_files_checksums
   )
 }
 export -f _monitored_files_checksums
+
+function _shutdown
+{
+  _notify 'err' "Shutting down.."
+  kill 1
+}

target/scripts/startup/check-stack.sh

@@ -25,7 +25,7 @@ function _check_hostname
   if ! grep -q -E '^(\S+[.]\S+)$' <<< "${HOSTNAME}"
   then
     _notify 'err' 'Setting hostname/domainname is required'
-    kill "$(< /var/run/supervisord.pid)"
+    _shutdown
     return 1
   fi
 }

target/scripts/startup/setup-stack.sh

@@ -1108,6 +1108,12 @@ function _setup_docker_permit
     grep 'inet ' | sed 's|[^0-9\.\/]*||g' | cut -d '/' -f 1)
   CONTAINER_NETWORK="$(echo "${CONTAINER_IP}" | cut -d '.' -f1-2).0.0"
 
+  if [[ -z ${CONTAINER_IP} ]]
+  then
+    _notify 'err' "Detecting the container IP address failed. Check if NETWORK_INTERFACE is correctly configured."
+    _shutdown
+  fi
+
   while read -r IP
   do
     CONTAINER_NETWORKS+=("${IP}")
@@ -1156,7 +1162,7 @@ function _setup_postfix_virtual_transport
   if [[ -z ${POSTFIX_DAGENT} ]]
   then
     _notify 'err' "${POSTFIX_DAGENT} not set."
-    kill -15 "$(< /var/run/supervisord.pid)"
+    _shutdown
     return 1
   fi