#!/bin/bash

# Copyright 2015 The Kubernetes Authors All rights reserved.
#
# 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 errexit
set -o nounset
set -o pipefail

declare -r KUBE_RELEASE_BUCKET_URL="https://storage.googleapis.com/kubernetes-release"
declare -r KUBE_TAR_NAME="kubernetes.tar.gz"

usage() {
	echo "usage:
  $0 [stable|release|latest|latest-green]

        stable:        latest stable version
        release:       latest release candidate
        latest:        latest ci build
        latest-green:  latest ci build to pass gce e2e"
}

if [[ $# -ne 1 ]]; then
    usage
    exit 1
fi

case "$1" in
  "latest")
    # latest ci version is written in the latest.txt in the /ci dir
    KUBE_TAR_RELATIVE_PATH="ci"
    KUBE_VERSION_FILE="latest.txt"
    ;;
  "latest-green")
    # latest ci version to pass gce e2e is written in the latest-green.txt in the /ci dir
    KUBE_TAR_RELATIVE_PATH="ci"
    KUBE_VERSION_FILE="latest-green.txt"
    ;;
  "stable")
    # latest stable release version is written in the stable.txt file in the /release dir
    KUBE_TAR_RELATIVE_PATH="release"
    KUBE_VERSION_FILE="stable.txt"
    ;;
  "release")
    # latest release candidate version is written in latest.txt in the /release dir
    KUBE_TAR_RELATIVE_PATH="release"
    KUBE_VERSION_FILE="latest.txt"
    ;;
  *)
    usage
    exit 1
    ;;
esac

KUBE_BINARY_DIRECTORY="${KUBE_RELEASE_BUCKET_URL}/${KUBE_TAR_RELATIVE_PATH}"
KUBE_VERSION=$(curl --silent --fail "${KUBE_BINARY_DIRECTORY}/${KUBE_VERSION_FILE}")
KUBE_BINARY_PATH="${KUBE_BINARY_DIRECTORY}/${KUBE_VERSION}/${KUBE_TAR_NAME}"

curl --fail -o kubernetes-${KUBE_VERSION}.tar.gz "${KUBE_BINARY_PATH}"