fetch.sh

#!/bin/bash
: '
Copyright 2021 The Kubernetes Authors.

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 -e

VARIABLES_FILE="sync/shared/variables.yaml"
BUILD_FROM_SOURCE=0
[[
  $(awk '/build_from_source/ {print $2}' ${VARIABLES_FILE} | sed -e 's/^"//' -e 's/"$//' | head -1) =~ "true"
]] && BUILD_FROM_SOURCE=1

# kubernetes version can be passed as param, otherwise it will be read from variables_file

variables_file="sync/shared/variables.yaml"
version=${1:-`awk '/kubernetes_version/ {print \$2}' ${variables_file} | sed -e 's/^"//' -e 's/"$//' | head -1`}
kubernetes_latest_file=`curl -f https://storage.googleapis.com/k8s-release-dev/ci/latest-${version}.txt`

kubernetes_sha=$(echo ${kubernetes_latest_file} | cut -d "+" -f 2)
kubernetes_tag=$(echo ${kubernetes_latest_file} | cut -d "+" -f 1)

if [ ! -z ${kubernetes_sha} ]; then
  echo "Using Kubernetes version ${kubernetes_tag}-${kubernetes_sha} from upstream"
fi

if [[ $BUILD_FROM_SOURCE -eq 1 ]]; then
  if [[ -d "kubernetes" ]] ; then
      echo "kubernetes/ exists, not cloning..."
      pushd kubernetes
        git checkout $kubernetes_sha -f
      popd
    else
      git clone https://github.com/kubernetes/kubernetes.git
      pushd kubernetes
        git checkout $kubernetes_sha
      popd
  fi
fi