# Copyright 2017 Google Inc. All rights reserved.

#

# 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.

# Dockerfile for building a Go application and generating the corresponding

# application Dockerfile for it. It expects the following build-args:

# go_version - Go SDK version to be bundled in this image.

# base_digest - distroless/base digest for use when generating application Dockerfile.

# build_tag - Docker label added into generated application image to identify builder.

# When this builder image is executed, it expects the application source files

# to be mounted at the current work directory.

FROM gcr.io/gcp-runtimes/ubuntu_16_0_4:latest

ARG go_version

ARG base_digest

ARG build_tag

ENV GO_VERSION ${go_version}

ENV BASE_DIGEST ${base_digest}

ENV BUILD_TAG ${build_tag}

RUN apt-get update -yq && apt-get upgrade -yq && apt-get install -y bzr git git-core mercurial subversion

# Copy checksum for use in validation.

COPY checksums/go${GO_VERSION}.sha256 /tmp/

# Download SDK and validate.

ADD https://storage.googleapis.com/golang/go${GO_VERSION}.linux-amd64.tar.gz /tmp/go.tar.gz

RUN echo "$(cat /tmp/go${GO_VERSION}.sha256) /tmp/go.tar.gz" | sha256sum -c - && \

tar -C /usr/local -xzf /tmp/go.tar.gz && \

rm /tmp/go.tar.gz /tmp/go${GO_VERSION}.sha256

COPY go-build.sh /usr/local/bin/

RUN chmod 755 /usr/local/bin/go-build.sh

ENTRYPOINT ["go-build.sh"]