add make install support

Makefile

@@ -20,6 +20,7 @@ REPO_ROOT=$(PWD)
 # autodetect host GOOS and GOARCH by default, even if go is not installed
 GOOS=$(shell hack/util/goos.sh)
 GOARCH=$(shell hack/util/goarch.sh)
+INSTALL_DIR=$(shell hack/util/goinstalldir.sh)
 # use the official module proxy by default
 GOPROXY=https://proxy.golang.org
 # default build image
@@ -31,6 +32,7 @@ CACHE_VOLUME=kind-build-cache
 # variables for consistent logic, don't override these
 CONTAINER_REPO_DIR=/src/kind
 CONTAINER_OUT_DIR=$(CONTAINER_REPO_DIR)/_output/bin
+HOST_OUT_DIR=$(REPO_ROOT)/_output/bin
 
 # standard "make" target -> builds
 all: build
@@ -62,7 +64,11 @@ kind: make-cache
 # alias for building kind
 build: kind
 
+# use: make install INSTALL_DIR=/usr/local/bin
+install: build
+	cp $(HOST_OUT_DIR)/kind $(INSTALL_DIR)/kind
+
 # standard cleanup target
 clean: clean-cache
 
-.PHONY: make-cache clean-cache kind build all clean
+.PHONY: all make-cache clean-cache kind build install clean

hack/util/goinstalldir.sh

@@ -0,0 +1,47 @@
+#!/bin/sh
+# Copyright 2019 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 utility prints out the golang install dir even if go is not installed
+
+# if we have go, just ask go!
+if which go >/dev/null 2>&1; then
+  DIR=$(go env GOBIN)
+  if [ -n "${DIR}" ]; then
+    echo "${DIR}"
+    exit 0
+  fi
+  DIR=$(go env GOPATH)
+  if [ -n "${DIR}" ]; then
+    echo "${DIR}/bin"
+    exit 0
+  fi
+fi
+
+# mimic go behavior
+
+# check if GOBIN is set anyhow
+if [ -n "${GOBIN}" ]; then
+  echo "GOBIN"
+  exit 0
+fi
+
+# check if GOPATH is set anyhow
+if [ -n "${GOPATH}" ]; then
+  echo "${GOPATH}/bin"
+  exit 0
+fi
+
+# finally use default for no $GOPATH or $GOBIN
+echo "${HOME}/go/bin"