feat: add script in the repo to setup envtest

.gitignore

@@ -13,6 +13,7 @@ docs/book/book/
 
 # skip bin
 bin/*
+testbin/*
 
 # skip .out files (coverage tests)
 *.out

scripts/setup_envtest_bins.sh

@@ -0,0 +1,86 @@
+#!/bin/sh
+
+#  Copyright 2020 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.
+
+# This file will be  fetched as: curl -L https://git.io/getLatestKubebuilder | sh -
+# so it should be pure bourne shell, not bash (and not reference other scripts)
+
+set -eu
+
+# To use envtest is required to have etcd, kube-apiserver and kubetcl binaries installed locally.
+# This script will create the directory testbin and perform this setup for linux or mac os x envs in
+
+# Kubernetes version e.g v1.18.2
+K8S_VER=$1
+# ETCD version e.g v3.4.3
+ETCD_VER=$2
+OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+ARCH=$(uname -m | sed 's/x86_64/amd64/')
+ETCD_EXT="tar.gz"
+TESTBIN_DIR=testbin
+
+function setup_testenv_bin() {
+  # Do nothing if the $TESTBIN_DIR directory exist already.
+  if [ ! -d $TESTBIN_DIR ]; then
+    mkdir -p $TESTBIN_DIR
+
+    # install etcd binary
+    # the extension for linux env is not equals for mac os x
+    if [ $OS == "darwin" ]; then
+       ETCD_EXT="zip"
+    fi
+    [[ -x ${TESTBIN_DIR}/etcd ]] || curl -L https://storage.googleapis.com/etcd/${ETCD_VER}/etcd-${ETCD_VER}-${OS}-${ARCH}.${ETCD_EXT} | tar zx -C ${TESTBIN_DIR} --strip-components=1 etcd-${ETCD_VER}-${OS}-${ARCH}/etcd
+
+    # install kube-apiserver and kubetcl binaries
+    if [ $OS == "darwin" ]
+    then
+      # kubernetes do not provide the kubernetes-server for darwin,
+      # In this way, to have the kube-apiserver is required to build it locally
+      # if the project is cloned locally already do nothing
+      if [ ! -d $GOPATH/src/k8s.io/kubernetes ]; then
+      git clone https://github.com/kubernetes/kubernetes $GOPATH/src/k8s.io/kubernetes --depth=1 -b ${K8S_VER}
+      fi
+
+      # if the kube-apiserve is built already then, just copy it
+      if [ ! -f $GOPATH/src/k8s.io/kubernetes/_output/local/bin/darwin/amd64/kube-apiserver ]; then
+      DIR=$(pwd)
+      cd $GOPATH/src/k8s.io/kubernetes
+      # Build for linux first otherwise it won't work for darwin - :(
+      export KUBE_BUILD_PLATFORMS="linux/amd64"
+      make WHAT=cmd/kube-apiserver
+      export KUBE_BUILD_PLATFORMS="darwin/amd64"
+      make WHAT=cmd/kube-apiserver
+      cd ${DIR}
+      fi
+      cp $GOPATH/src/k8s.io/kubernetes/_output/local/bin/darwin/amd64/kube-apiserver $TESTBIN_DIR/
+
+      # setup kubectl binary
+      curl -LO https://storage.googleapis.com/kubernetes-release/release/${K8S_VER}/bin/darwin/amd64/kubectl
+      chmod +x kubectl
+      mv kubectl $TESTBIN_DIR/
+
+      # allow run the tests without the Mac OS Firewall popup shows for each execution
+      codesign --deep --force --verbose --sign - ./${TESTBIN_DIR}/kube-apiserver
+    else
+      [[ -x $TESTBIN_DIR/kube-apiserver && -x ${TESTBIN_DIR}/kubectl ]] || curl -L https://dl.k8s.io/${K8S_VER}/kubernetes-server-${OS}-${ARCH}.tar.gz | tar zx -C ${TESTBIN_DIR} --strip-components=3 kubernetes/server/bin/kube-apiserver kubernetes/server/bin/kubectl
+    fi
+  fi
+  export PATH=/$TESTBIN_DIR:$PATH
+  export TEST_ASSET_KUBECTL=/$TESTBIN_DIR/kubectl
+  export TEST_ASSET_KUBE_APISERVER=/$TESTBIN_DIR/kube-apiserver
+  export TEST_ASSET_ETCD=/$TESTBIN_DIR/etcd
+}
+
+setup_testenv_bin