Preload docker images into kic base image

Adds support for specifying kubernetes version and preloading docker
images into the kic base image.

Though this increases the kic base image by ~1.6G, it should improve
start latency in conjunction with removing 'kubeadm pull images' in
another PR.

Makefile

@@ -19,6 +19,8 @@ VERSION_BUILD ?= 1
 RAW_VERSION=$(VERSION_MAJOR).$(VERSION_MINOR).${VERSION_BUILD}
 VERSION ?= v$(RAW_VERSION)
 
+KUBERNETES_VERSION ?= $(shell cat pkg/minikube/constants/constants.go | grep "DefaultKubernetesVersion =" | cut -d ' ' -f4 | sed 's/"//g')
+
 # Default to .0 for higher cache hit rates, as build increments typically don't require new ISO versions
 ISO_VERSION ?= v$(VERSION_MAJOR).$(VERSION_MINOR).0
 # Dashes are valid in semver, but not Linux packaging. Use ~ to delimit alpha/beta
@@ -500,10 +502,13 @@ storage-provisioner-image: out/storage-provisioner-$(GOARCH) ## Build storage-pr
 	docker build -t $(STORAGE_PROVISIONER_IMAGE) -f deploy/storage-provisioner/Dockerfile  --build-arg arch=$(GOARCH) .
 
 .PHONY: kic-base-image
-kic-base-image: ## builds the base image used for kic.
-	docker rmi -f $(REGISTRY)/kicbase:v0.0.5-snapshot || true
-	docker build -f ./hack/images/kicbase.Dockerfile -t $(REGISTRY)/kicbase:v0.0.5-snapshot  --build-arg COMMIT_SHA=${VERSION}-$(COMMIT)  .
+kic-base-image: generate-preloaded-images-tar ## builds the base image used for kic.
+	docker rmi -f $(REGISTRY)/kicbase:v0.0.5-k8s-${KUBERNETES_VERSION} || true
+	docker build -f ./hack/images/kicbase.Dockerfile -t $(REGISTRY)/kicbase:v0.0.5-k8s-${KUBERNETES_VERSION}  --build-arg COMMIT_SHA=${VERSION}-$(COMMIT) --build-arg KUBERNETES_VERSION=${KUBERNETES_VERSION} .
 
+.PHONY: generate-preloaded-images-tar
+generate-preloaded-images-tar: out/minikube
+	KUBERNETES_VERSION=${KUBERNETES_VERSION} ./hack/preload-images/generate-preloaded-images-tar.sh
 
 
 .PHONY: push-storage-provisioner-image

hack/images/kicbase.Dockerfile

@@ -2,7 +2,7 @@ ARG COMMIT_SHA
 # using base image created by kind https://github.com/kubernetes-sigs/kind
 # which is an ubuntu 19.10 with an entry-point that helps running systemd
 # could be changed to any debian that can run systemd
-FROM kindest/base:v20200122-2dfe64b2
+FROM kindest/base:v20200122-2dfe64b2 as base
 USER root
 RUN apt-get update && apt-get install -y \
   sudo \
@@ -34,12 +34,21 @@ USER root
 # https://github.com/kubernetes-sigs/kind/blob/master/images/base/files/usr/local/bin/entrypoint
 RUN mkdir -p /kind
 RUN rm -rf \
-    /var/cache/debconf/* \
-    /var/lib/apt/lists/* \
-    /var/log/* \
-    /tmp/* \
-    /var/tmp/* \
-    /usr/share/doc/* \
-    /usr/share/man/* \
-    /usr/share/local/* \
-RUN echo "kic! Build: ${COMMIT_SHA} Time :$(date)" > "/kic.txt"
+  /var/cache/debconf/* \
+  /var/lib/apt/lists/* \
+  /var/log/* \
+  /tmp/* \
+  /var/tmp/* \
+  /usr/share/doc/* \
+  /usr/share/man/* \
+  /usr/share/local/* \
+  RUN echo "kic! Build: ${COMMIT_SHA} Time :$(date)" > "/kic.txt"
+
+
+FROM busybox
+ARG KUBERNETES_VERSION
+COPY out/preloaded-images-k8s-$KUBERNETES_VERSION.tar /preloaded-images.tar
+RUN tar xvf /preloaded-images.tar -C /
+
+FROM base
+COPY --from=1 /var/lib/docker /var/lib/docker 

hack/preload-images/generate-preloaded-images-tar.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# Copyright 2016 The Kubernetes Authors 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.
+
+set -ex 
+
+PROFILE=generate-preloaded-images-tar
+KUBERNETES_VERSION=${KUBERNETES_VERSION:-""}
+TARBALL_FILENAME=preloaded-images-k8s-$KUBERNETES_VERSION.tar
+
+function delete_minikube {
+    out/minikube delete --profile=$PROFILE
+}
+
+trap "delete_minikube" ERR
+
+out/minikube start --memory=10000 --profile=$PROFILE --kubernetes-version=$KUBERNETES_VERSION
+out/minikube ssh --profile=$PROFILE -- sudo tar cvf $TARBALL_FILENAME /var/lib/docker 
+scp -o StrictHostKeyChecking=no  -i $(out/minikube ssh-key --profile=$PROFILE) docker@$(out/minikube ip --profile=$PROFILE):/home/docker/$TARBALL_FILENAME out/$TARBALL_FILENAME
+delete_minikube