Clean cross-build image and update to protoc 3.0.2

build/build-image/cross/Dockerfile

@@ -33,24 +33,14 @@ ENV KUBE_CROSSPLATFORMS \
   windows/amd64 windows/386
 
 # Pre-compile the standard go library when cross-compiling. This is much easier now when we have go1.5+
-RUN for platform in ${KUBE_CROSSPLATFORMS}; do GOOS=${platform%/*} GOARCH=${platform##*/} go install std; done
+RUN for platform in ${KUBE_CROSSPLATFORMS}; do GOOS=${platform%/*} GOARCH=${platform##*/} go install std; done \
+    && go clean -cache
 
 # Install g++, then download and install protoc for generating protobuf output
 RUN apt-get update \
-  && apt-get install -y g++ rsync jq apt-utils file patch \
+  && apt-get install -y rsync jq apt-utils file patch unzip \
   && apt-get clean && rm -rf /var/lib/apt/lists/*
 
-RUN mkdir -p /usr/local/src/protobuf \
-  && cd /usr/local/src/protobuf \
-  && curl -sSL https://github.com/google/protobuf/releases/download/v3.0.0-beta-2/protobuf-cpp-3.0.0-beta-2.tar.gz | tar -xzv \
-  && cd protobuf-3.0.0-beta-2 \
-  && ./configure \
-  && make install \
-  && ldconfig \
-  && cd .. \
-  && rm -rf protobuf-3.0.0-beta-2 \
-  && protoc --version
-
 # Use dynamic cgo linking for architectures other than amd64 for the server platforms
 # To install crossbuild essential for other architectures add the following repository.
 RUN echo "deb http://archive.ubuntu.com/ubuntu xenial main universe" > /etc/apt/sources.list.d/cgocrosscompiling.list \
@@ -60,6 +50,16 @@ RUN echo "deb http://archive.ubuntu.com/ubuntu xenial main universe" > /etc/apt/
   && for platform in ${KUBE_DYNAMIC_CROSSPLATFORMS}; do apt-get install -y crossbuild-essential-${platform}; done \
   && apt-get clean && rm -rf /var/lib/apt/lists/*
 
+RUN PROTOBUF_VERSION=3.0.2; ZIPNAME="protoc-${PROTOBUF_VERSION}-linux-x86_64.zip"; \
+  mkdir /tmp/protoc && cd /tmp/protoc \
+  && wget "https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOBUF_VERSION}/${ZIPNAME}" \
+  && unzip "${ZIPNAME}" \
+  && chmod -R +rX /tmp/protoc \
+  && cp -pr bin /usr/local \
+  && cp -pr include /usr/local \
+  && rm -rf /tmp/protoc \
+  && protoc --version
+
 # work around 64MB tmpfs size in Docker 1.6
 ENV TMPDIR /tmp.k8s
 RUN mkdir $TMPDIR \
@@ -68,7 +68,8 @@ RUN mkdir $TMPDIR \
 
 # Get the code coverage tool and goimports
 RUN go get golang.org/x/tools/cmd/cover \
-            golang.org/x/tools/cmd/goimports
+           golang.org/x/tools/cmd/goimports \
+    && go clean -cache
 
 # Download and symlink etcd. We need this for our integration tests.
 RUN export ETCD_VERSION=v3.2.24; \

build/build-image/cross/VERSION

@@ -1 +1 @@
-v1.11.1-1
+v1.11.1-2