Enhance docker network ipaddresspool

Makefile

@@ -408,11 +408,11 @@ undeploy-policy-controller: ## Undeploy policy-controller from the K8s cluster s
 	$(KUSTOMIZE) build config/policy-controller | kubectl delete -f -
 
 .PHONY: install-metallb
-install-metallb: $(KUSTOMIZE) ## Installs the metallb load balancer allowing use of an LoadBalancer type with a gateway
+install-metallb: kustomize yq ## Installs the metallb load balancer allowing use of an LoadBalancer type with a gateway
 	$(KUSTOMIZE) build config/metallb | kubectl apply -f -
 	kubectl -n metallb-system wait --for=condition=Available deployments controller --timeout=300s
 	kubectl -n metallb-system wait --for=condition=ready pod --selector=app=metallb --timeout=60s
-	./utils/docker-network-ipaddresspool.sh kind | kubectl apply -n metallb-system -f -
+	./utils/docker-network-ipaddresspool.sh kind $(YQ) | kubectl apply -n metallb-system -f -
 
 .PHONY: uninstall-metallb
 uninstall-metallb: $(KUSTOMIZE) 

utils/docker-network-ipaddresspool.sh

@@ -9,20 +9,25 @@
 set -euo pipefail
 
 networkName=$1
+YQ="${2:-yq}"
 
-subnet=`docker network inspect $networkName -f '{{ (index .IPAM.Config 0).Subnet }}'`
-# shellcheck disable=SC2206
-subnetParts=(${subnet//./ })
-cidr="${subnetParts[0]}.${subnetParts[1]}.200.0/24"
+## Parse kind network subnet
+## Take only IPv4 subnets, exclude IPv6
+SUBNET=$(docker network inspect $networkName --format '{{json .IPAM.Config }}' | \
+    ${YQ} '.[] | select( .Subnet | test("^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}/\d+$")) | .Subnet')
+if [[ -z "$SUBNET" ]]; then
+   echo "Error: parsing IPv4 network address for '$networkName' docker network"
+   exit 1
+fi
 
-cat <<EOF
+cat <<EOF | ADDRESS=$SUBNET ${YQ} '(select(.kind == "IPAddressPool") | .spec.addresses[0]) = env(ADDRESS)'
+---
 apiVersion: metallb.io/v1beta1
 kind: IPAddressPool
 metadata:
   name: kuadrant-local
 spec:
-  addresses:
-  - $cidr
+  addresses: [] # set by make target
 ---
 apiVersion: metallb.io/v1beta1
 kind: L2Advertisement