#!/bin/bash

# Copyright 2018 by the contributors
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.

set -o verbose
set -o errexit
set -o nounset
set -o pipefail

# Sanity check: This is a mustache template, so make the script die if any of
# these aren't set.
test -n "{{K8sMasterPrivateIp}}"
test -n "{{ClusterToken}}"
test -n "{{ClusterInfoBucket}}"

kubeadm reset --force

# Get the discovery file
aws s3 cp "s3://{{ClusterInfoBucket}}/cluster-info.yaml" /tmp/cluster-info.yaml

HOSTNAME="$(hostname -f 2>/dev/null || curl http://169.254.169.254/latest/meta-data/local-hostname)"

cat >/tmp/kubeadm-node.yaml <<EOF
---
apiVersion: kubeadm.k8s.io/v1beta1
kind: JoinConfiguration
discovery:
  tlsBootstrapToken: "{{ClusterToken}}"
  file:
    kubeConfigPath: "/tmp/cluster-info.yaml"
nodeRegistration:
  name: "${HOSTNAME}"
  kubeletExtraArgs:
    cloud-provider: aws
EOF

kubeadm join --config /tmp/kubeadm-node.yaml "{{K8sMasterPrivateIp}}:6443"