Windows CI: Setup for testing against Windows

Signed-off-by: John Howard <jhoward@microsoft.com>

hack/make/.ensure-frozen-images

@@ -30,7 +30,7 @@ fi
 if ! docker inspect "${images[@]}" &> /dev/null; then
 	hardCodedDir='/docker-frozen-images'
 	if [ -d "$hardCodedDir" ]; then
-		# Do not use a subshell for the following command. Windows CI
+		# Do not use a subshell for the following command. Windows to Linux CI
 		# runs bash 3.x so will not trap an error in a subshell.
 		# http://stackoverflow.com/questions/22630363/how-does-set-e-work-with-subshells
 		set -x; tar -cC "$hardCodedDir" . | docker load; set +x
@@ -55,7 +55,7 @@ if ! docker inspect "${images[@]}" &> /dev/null; then
 				}
 			}
 		' "${DOCKERFILE:=Dockerfile}" | sh -x
-		# Do not use a subshell for the following command. Windows CI
+		# Do not use a subshell for the following command. Windows to Linux CI
 		# runs bash 3.x so will not trap an error in a subshell.
 		# http://stackoverflow.com/questions/22630363/how-does-set-e-work-with-subshells
 		set -x; tar -cC "$dir" . | docker load; set +x

hack/make/.ensure-frozen-images-windows

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -e
+
+# This scripts sets up the required images for Windows to Windows CI
+
+# Tag windowsservercore as latest
+set +e
+! BUILD=$(docker images | grep windowsservercore | grep -v latest | awk '{print $2}')
+if [ -z $BUILD ]; then
+	echo "ERROR: Could not find windowsservercore images"
+	exit 1
+fi
+
+! LATESTCOUNT=$(docker images | grep windowsservercore | grep -v $BUILD | wc -l)
+if [ $LATESTCOUNT -ne 1 ]; then
+	set -e
+	docker tag windowsservercore:$BUILD windowsservercore:latest
+	echo "INFO: Tagged windowsservercore:$BUILD with latest"
+fi
+
+# Busybox (requires windowsservercore)
+if [ -z "$(docker images | grep busybox)" ]; then
+	echo "INFO: Building busybox"
+	docker build -t busybox https://raw.githubusercontent.com/jhowardmsft/busybox/master/Dockerfile
+fi

hack/make/.integration-daemon-setup

@@ -2,7 +2,12 @@
 set -e
 
 bundle .detect-daemon-osarch
+if [ $DOCKER_ENGINE_GOOS != "windows" ]; then
 	bundle .ensure-emptyfs
 	bundle .ensure-frozen-images
 	bundle .ensure-httpserver
 	bundle .ensure-syscall-test
+else
+	# Note this is Windows to Windows CI, not Windows to Linux CI
+	bundle .ensure-frozen-images-windows
+fi