kubernetes: Autogenerate file with image cache digests

Signed-off-by: Ian Campbell <ijc@docker.com>

projects/kubernetes/image-cache/Makefile

@@ -33,3 +33,7 @@ dl: $(patsubst %,dl/%.tar,$(COMMON_IMAGES) $(CONTROL_PLANE_IMAGES))
 .PHONY: clean
 clean:
 	rm -rf dl
+
+.PHONY: refresh
+refresh:
+	./mkversions > versions.mk

projects/kubernetes/image-cache/mkversions

@@ -0,0 +1,45 @@
+#!/bin/sh
+repo=gcr.io/google_containers
+kube_version=v1.7.4
+kube_dns_version=1.14.4
+pause_version=3.0
+etcd_version=3.0.17
+
+common="
+	kube-proxy-amd64:$kube_version
+	k8s-dns-sidecar-amd64:$kube_dns_version
+	k8s-dns-kube-dns-amd64:$kube_dns_version
+	k8s-dns-dnsmasq-nanny-amd64:$kube_dns_version
+	pause-amd64:$pause_version"
+
+control="
+	kube-apiserver-amd64:$kube_version
+	kube-controller-manager-amd64:$kube_version
+	kube-scheduler-amd64:$kube_version
+	etcd-amd64:$etcd_version"
+
+for i in $common $control ; do
+	docker image pull "$repo/$i" 1>&2
+done
+
+oi() {
+	local i="$1"
+	digest=$(docker image inspect "$repo/$i" | jq -r '.[].RepoDigests[0]')
+	i=$(echo "${i}@${digest#*@}" | sed -e 's/:/\\:/g')
+	echo " \\"
+	echo -n "  ${i}"
+}
+
+rm -f $t
+echo "# autogenerated by mkversions"
+echo -n "COMMON_IMAGES :="
+for i in $common ; do
+	oi "$i"
+done
+echo ""
+echo ""
+echo -n "CONTROL_PLANE_IMAGES :="
+for i in $control ; do
+	oi "$i"
+done
+echo ""

projects/kubernetes/image-cache/versions.mk

@@ -1,3 +1,4 @@
+# autogenerated by mkversions
 COMMON_IMAGES := \
   kube-proxy-amd64\:v1.7.4@sha256\:5373a1c294c9ffb2e842d74d3df8fcc5bed68c02af3fb3611c2fd71a411a68fe \
   k8s-dns-sidecar-amd64\:1.14.4@sha256\:97074c951046e37d3cbb98b82ae85ed15704a290cce66a8314e7f846404edde9 \