Remove additional bin/bash comment. Exit the installation process if …

…/usr/local/kubebuilder folder exists. Rename KUBEBUILDER_VAR_NAME

scripts/install.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+#
+# 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)
+#
+# The script fetches the latest kubebuilder release candidate and untars it.
+# It lets users to do curl -L https://git.io//getLatestKubebuilder | KUBEBUILDER_VERSION=1.0.5 sh -
+# for instance to change the version fetched.
+
+OS="$(uname)"
+if [ "x${OS}" = "xDarwin" ] ; then
+  OSEXT="darwin"
+else
+  OSEXT="linux"
+fi
+ARCH=amd64
+
+if [ "x${KUBEBUILDER_VERSION}" = "x" ] ; then
+  KUBEBUILDER_VERSION=$(curl -L -s https://api.github.com/repos/kubernetes-sigs/kubebuilder/releases/latest | \
+                  grep tag_name | sed "s/ *\"tag_name\": *\"\\(.*\\)\",*/\\1/")
+fi
+
+KUBEBUILDER_VERSION=${KUBEBUILDER_VERSION#"v"}
+KUBEBUILDER_VERSION_NAME="kubebuilder_${KUBEBUILDER_VERSION}"
+URL="https://github.com/kubernetes-sigs/kubebuilder/releases/download/v${KUBEBUILDER_VERSION}/${KUBEBUILDER_VERSION_NAME}_${OSEXT}_${ARCH}.tar.gz"
+echo "Downloading ${KUBEBUILDER_VERSION_NAME} from $URL ..."
+curl -L "$URL" | tar xz
+
+echo "Downloaded these executable files into $NAME: "
+ls "${KUBEBUILDER_VERSION_NAME}_${OSEXT}_${ARCH}/bin"
+mv ${KUBEBUILDER_VERSION_NAME}_${OSEXT}_${ARCH} kubebuilder && sudo mv -f kubebuilder /usr/local/
+RETVAL=$?
+
+if [ $RETVAL -eq 0 ]; then
+  echo "Add kubebuilder to your path; e.g copy paste in your shell and/or ~/.profile:"
+  echo "export PATH=\$PATH:/usr/local/kubebuilder/bin"
+else
+  echo "\n/usr/local/kubebuilder folder is not empty. Please delete or backup it before to install ${KUBEBUILDER_VERSION_NAME}"
+fi