Make docker build pipeline always use clean env and actaully work

.dockerignore

@@ -1 +1,25 @@
+# Copyright 2015 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.
+
+# Do not include the Docker build pipeline itself.
+build/Dockerfile
+build/run-gulp-in-docker.sh
+
+# Ignore all development artifacts so that the build is always clean.
 .git
+.tmp/
+.tools/
+bower_components/
+dist/
+node_modules/

Dockerfile → build/Dockerfile

@@ -14,17 +14,17 @@
 
 # This is a Dockerfile for running and building Kubernetes dashboard
 # It installs all deps in the container and adds the dashboard source
-# This way it abstracts all required build tools away and lets the user run gulp tasks on the code with only docker installed
+# This way it abstracts all required build tools away and lets the user
+# run gulp tasks on the code with only docker installed
 
 # golang is based on debian:jessie
-FROM golang:1.5.3
+FROM golang
 
-# Install python, java and nodejs. go is already installed
-# A small tweak, apt-get update is already run by the nodejs setup script, so there's no need to run it again
+# Install java and nodejs. go is already installed
+# A small tweak, apt-get update is already run by the nodejs setup script,
+# so there's no need to run it again
 RUN curl -sL https://deb.nodesource.com/setup_5.x | bash - \
   && apt-get install -y --no-install-recommends \
-	file \
-	python \
 	openjdk-7-jre \
 	nodejs \
 	&& rm -rf /var/lib/apt/lists/* \
@@ -37,13 +37,8 @@ RUN curl -sSL https://get.docker.com/builds/Linux/x86_64/docker-1.9.1 > /usr/bin
 # Current directory is always /dashboard
 WORKDIR /dashboard
 
-# Copy over package.json bower.json and postinstall.sh.
-# Why? Because of docker caching, npm install will only run again if one of these have changed
-COPY package.json bower.json ./
-COPY build/postinstall.sh build/
+# Copy entire source tree.
+COPY ./ ./
 
 # Install all npm deps, bower deps and godep. This will take a while.
 RUN npm install --unsafe-perm
-
-# Copy over the rest of the source
-COPY ./ ./

build/run-gulp-in-docker.sh

@@ -19,9 +19,11 @@
 DOCKER_RUN_OPTS=${DOCKER_RUN_OPTS:-}
 DASHBOARD_IMAGE_NAME="kubernetes-dashboard-build-image"
 DEFAULT_COMMAND=${DEFAULT_COMMAND:-"node_modules/.bin/gulp"}
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
-# Always test if the image is up-to-date. If nothing has changed since last build, it'll just use the already-built image
-docker build -t ${DASHBOARD_IMAGE_NAME} .
+# Always test if the image is up-to-date. If nothing has changed since last build,
+# it'll just use the already-built image
+docker build -t ${DASHBOARD_IMAGE_NAME} -f ${DIR}/Dockerfile ${DIR}/../
 
 # Run gulp in the container in interactive mode and expose necessary ports automatically
 docker run \