add Makefile for building/pushing cni binary

build/cni/Makefile

+# Copyright 2016 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.
+
+# Build the CNI binaries.
+#
+# Usage:
+#	[ARCH=amd64] [CNI_RELEASE=v0.3.0] make (build|push)
+
+ARCH?=amd64
+CNI_RELEASE?=9d5e6e60e79491207834ae8439e80c943db65a69
+CNI_TARBALL=cni-$(ARCH)-$(CNI_RELEASE).tar.gz
+CUR_DIR=$(shell pwd)
+OUTPUT_DIR=$(CUR_DIR)/output
+
+all: build
+
+build:
+	mkdir -p $(OUTPUT_DIR)
+
+	docker run -it -v $(OUTPUT_DIR):/output golang:1.6 /bin/bash -c "\
+	git clone https://github.com/containernetworking/cni\
+	&& cd cni \
+	&& git checkout $(CNI_RELEASE) \
+	&& CGO_ENABLED=0 GOOS=linux GOARCH=$(ARCH) ./build \
+	&& tar -zcvf $(CNI_TARBALL) bin/ \
+	&& mv $(CNI_TARBALL) /output/"
+
+# Backward Compatibility
+ifeq ($(ARCH),amd64)
+	cp $(OUTPUT_DIR)/$(CNI_TARBALL) $(OUTPUT_DIR)/cni-$(CNI_RELEASE).tar.gz
+endif
+
+push: build
+	gsutil cp $(OUTPUT_DIR)/$(CNI_TARBALL) gs://kubernetes-release/network-plugins
+
+ifeq ($(ARCH),amd64)
+	gsutil cp cni-$(CNI_RELEASE).tar.gz gs://kubernetes-release/network-plugins
+endif
+
+clean:
+	rm -rf output/
+
+.PHONY: all