tools: Build qemu package from the Alpine base

Also use the git tree hash as the hash.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>

tools/qemu/Dockerfile

@@ -1,15 +1,19 @@
-FROM alpine:edge
+FROM linuxkit/alpine:5240cbd9cf371c8211c8f1968e57c51a32098c8f AS mirror
+RUN mkdir -p /out/etc/apk && cp -r /etc/apk/* /out/etc/apk/
+RUN apk add --no-cache --initdb -p /out \
+    alpine-baselayout \
+    busybox \
+    libarchive-tools \
+    qemu-img \
+    qemu-system-x86_64
 
-COPY repositories /etc/apk/
+RUN mkdir -p /out/usr/share/ovmf \
+    && cp /usr/share/ovmf/bios.bin /out/usr/share/ovmf/bios.bin
+RUN rm -rf /out/etc/apk /out/lib/apk /out/var/cache
 
-RUN \
+FROM scratch
-  apk update && apk upgrade && \
+ENTRYPOINT []
-  apk add --no-cache \
+CMD []
-  libarchive-tools \
+WORKDIR /
-  qemu-img \
+COPY --from=mirror /out/ /
-  qemu-system-arm \
-  qemu-system-x86_64 \
-  ovmf@testing \
-  && true
 
-COPY . .

tools/qemu/Makefile

@@ -1,29 +1,15 @@
 .PHONY: tag push
-
-BASE=alpine:3.5
-IMAGE=qemu
-
 default: push
 
-hash: Dockerfile repositories
+ORG?=linuxkit
-	DOCKER_CONTENT_TRUST=1 docker pull $(BASE)
+IMAGE=qemu
-	tar cf - $^ | docker build --no-cache -t $(IMAGE):build -
+DEPS=Dockerfile Makefile
-	docker run --rm --entrypoint /bin/sh $(IMAGE):build -c 'cat Dockerfile /lib/apk/db/installed | sha1sum' | sed 's/ .*//' > $@
 
-push: hash
+HASH?=$(shell git ls-tree HEAD -- ../$(notdir $(CURDIR)) | awk '{print $$3}')
-	docker pull linuxkit/$(IMAGE):$(shell cat hash) || \
-		(docker tag $(IMAGE):build linuxkit/$(IMAGE):$(shell cat hash) && \
-		 docker push linuxkit/$(IMAGE):$(shell cat hash))
-	docker rmi $(IMAGE):build
-	rm -f hash
 
-tag: hash
+tag: $(DEPS)
-	docker pull linuxkit/$(IMAGE):$(shell cat hash) || \
+	DOCKER_CONTENT_TRUST=1 docker build --no-cache --network=none -t $(ORG)/$(IMAGE):$(HASH) .
-		docker tag $(IMAGE):build linuxkit/$(IMAGE):$(shell cat hash)
-	docker rmi $(IMAGE):build
-	rm -f hash
 
-clean:
+push: tag
-	rm -f hash
+	docker pull $(ORG)/$(IMAGE):$(HASH) || \
-
+	docker push $(ORG)/$(IMAGE):$(HASH)
-.DELETE_ON_ERROR:

tools/qemu/repositories

@@ -1,2 +0,0 @@
-http://dl-cdn.alpinelinux.org/alpine/edge/main
-@testing http://dl-cdn.alpinelinux.org/alpine/edge/testing