#!/bin/bash
set -eu

# 1. Create registry container unless it already exists
if [ "$(docker inspect -f '{{.State.Running}}' "${CLUSTER_DESIRED}" 2>/dev/null || true)" != 'true' ]; then
  docker run \
    -d --restart=always -p "127.0.0.1:${REGISTRY_PORT}:5000" --network bridge --name "${REGISTRY_NAME}" \
    registry:2
fi

kind create cluster --name "${CLUSTER_DESIRED}" --config=.ci/xdp/cluster-config.yaml

# 3. Add the registry config to the nodes
#
# This is necessary because localhost resolves to loopback addresses that are
# network-namespace local.
# In other words: localhost in the container is not localhost on the host.
#
# We want a consistent name that works from both ends, so we tell containerd to
# alias localhost:${reg_port} to the registry container when pulling images
REGISTRY_DIR="/etc/containerd/certs.d/localhost:${REGISTRY_PORT}"
for node in $(kind get nodes); do
  docker exec "${node}" mkdir -p "${REGISTRY_DIR}"
  cat <<EOF | docker exec -i "${node}" cp /dev/stdin "${REGISTRY_DIR}/hosts.toml"
[host."http://${REGISTRY_NAME}:5000"]
EOF
done

# 4. Connect the registry to the cluster network if not already connected
# This allows kind to bootstrap the network but ensures they're on the same network
if [ "$(docker inspect -f='{{json .NetworkSettings.Networks.kind}}' "${REGISTRY_NAME}")" = 'null' ]; then
  docker network connect "kind" "${REGISTRY_NAME}"
fi

# 5. Document the local registry
# https://github.com/kubernetes/enhancements/tree/master/keps/sig-cluster-lifecycle/generic/1755-communicating-a-local-registry
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
  name: local-registry-hosting
  namespace: kube-public
data:
  localRegistryHosting.v1: |
    host: "localhost:${REGISTRY_PORT}"
    help: "https://kind.sigs.k8s.io/docs/user/local-registry/"
EOF
