Build a GCE image

- this is a raw 1GB filesystem image with syslinux for booting
- built with libguestfs so does not need any privileges
- need not be built on GCE
- there is a target that runs the image in qemu for local tests

Does not yet have a script to upload the image to cloud storage or create image from it.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

alpine/.gitignore

@@ -2,6 +2,7 @@
 *.tag
 *.iso
 *.vhd
+*.tar.gz
 /mobylinux-boot.vhdx
 /mobylinux.efi
 etc/moby-commit

alpine/Makefile

@@ -16,6 +16,9 @@ BIOS_IMAGE=mobylinux/mkimage-iso-bios@sha256:7e28f7745fd62284142dce59a137c3331f7
 # Tag: 95d4fef1a9555b640b4f94a4a3968533714059fe
 PAD4_IMAGE=mobylinux/pad4@sha256:a26e02f16bdafa241a55e05fa09b9bb260e69a3a8c90418bb40b4ae936437d17
 
+# Tag: df1b8ef666d66694e84f23772937ff45c46fa6c1
+GCE_IMAGE=mobylinux/mkimage-gce@sha256:b19ba24184ed5602df5b666ed475d5d7211fa67bee51d3e6380cf0380c63f65b
+
 moby.img: Dockerfile mkinitrd.sh init $(ETCFILES)
 	$(MAKE) -C kernel
 	$(MAKE) -j -C packages
@@ -76,7 +79,13 @@ mobylinux-efi.iso: Dockerfile.efi initrd.img kernel/x86_64/vmlinuz64
 
 mobylinux-bios.iso: initrd.img kernel/x86_64/vmlinuz64
 	tar cf - initrd.img -C kernel/x86_64 vmlinuz64 | \
-	  docker run --rm --net=none --log-driver=none -i $(BIOS_IMAGE) >$@
+		docker run --rm --net=none --log-driver=none -i $(BIOS_IMAGE) >$@
+
+gce: gce.img.tar.gz
+
+gce.img.tar.gz: common
+	tar cf - initrd.img -C kernel/x86_64 vmlinuz64 | \
+		docker run --rm --net=none --log-driver=none -i $(GCE_IMAGE) >$@
 
 common: initrd.img
 	$(MAKE) -C kernel

alpine/base/guestfs/Dockerfile

@@ -0,0 +1,4 @@
+FROM debian:jessie
+
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get -yq upgrade && apt-get install -yq libguestfs-tools syslinux linux-image-amd64 vim

alpine/base/guestfs/Makefile

@@ -0,0 +1,29 @@
+.PHONY: tag push
+
+BASE=debian:jessie
+IMAGE=guestfs
+
+default: push
+
+hash: Dockerfile
+	DOCKER_CONTENT_TRUST=1 docker pull $(BASE)
+	tar cf - $^ | docker build --no-cache -t $(IMAGE):build -
+	docker run --rm $(IMAGE):build sh -c 'apt list --installed 2>/dev/null | sha1sum' | sed 's/ .*//' > hash
+
+push: hash
+	docker pull mobylinux/$(IMAGE):$(shell cat hash) || \
+		(docker tag $(IMAGE):build mobylinux/$(IMAGE):$(shell cat hash) && \
+		 docker push mobylinux/$(IMAGE):$(shell cat hash))
+	docker rmi $(IMAGE):build
+	rm -f hash
+
+tag: hash
+	docker pull mobylinux/$(IMAGE):$(shell cat hash) || \
+		docker tag $(IMAGE):build mobylinux/$(IMAGE):$(shell cat hash)
+	docker rmi $(IMAGE):build
+	rm -f hash
+
+clean:
+	rm -f hash
+
+.DELETE_ON_ERROR:

alpine/base/mkimage-gce/Dockerfile

@@ -0,0 +1,10 @@
+# Tag: 8719f0f33b3cf9d59a62be64a42220978ac96486
+FROM mobylinux/guestfs@sha256:c7229f01c1a54270d2bc3597c30121628c18db211ed32fb7202823b6eaa4f853
+
+WORKDIR /tmp/image
+
+COPY . .
+
+COPY make-gce /usr/bin
+
+CMD [ "/usr/bin/make-gce" ]

alpine/base/mkimage-gce/Makefile

@@ -0,0 +1,27 @@
+.PHONY: tag push
+
+IMAGE=mkimage-gce
+
+default: push
+
+hash: Dockerfile make-gce syslinux.cfg
+	tar cf - $^ | docker build --no-cache -t $(IMAGE):build -
+	docker run --rm $(IMAGE):build sh -c "(cat $^; apt list --installed 2>/dev/null) | sha1sum" | sed 's/ .*//' > hash
+
+push: hash
+	docker pull mobylinux/$(IMAGE):$(shell cat hash) || \
+		(docker tag $(IMAGE):build mobylinux/$(IMAGE):$(shell cat hash) && \
+		 docker push mobylinux/$(IMAGE):$(shell cat hash))
+	docker rmi $(IMAGE):build
+	rm -f hash
+
+tag: hash
+	docker pull mobylinux/$(IMAGE):$(shell cat hash) || \
+		docker tag $(IMAGE):build mobylinux/$(IMAGE):$(shell cat hash)
+	docker rmi $(IMAGE):build
+	rm -f hash
+
+clean:
+	rm -f hash
+
+.DELETE_ON_ERROR:

alpine/base/mkimage-gce/make-gce

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+set -e
+
+# input is a tarball of vmlinuz64 and initrd.img on stdin
+# output is a compressed tarball of a raw disk image on stdout
+
+mkdir -p files
+tar xf - -C files
+
+cp syslinux.cfg files
+
+tar cf files.tar -C files .
+
+virt-make-fs --size=1G --type=ext4 --partition files.tar disk.raw
+
+guestfish -a disk.raw -m /dev/sda1 <<EOF
+  upload /usr/lib/SYSLINUX/mbr.bin /mbr.bin
+  copy-file-to-device /mbr.bin /dev/sda size:440
+  rm /mbr.bin
+  extlinux /
+  part-set-bootable /dev/sda 1 true
+EOF
+
+tar cf - disk.raw | gzip -9

alpine/base/mkimage-gce/syslinux.cfg

@@ -0,0 +1,5 @@
+DEFAULT linux
+LABEL linux
+    KERNEL /vmlinuz64
+    INITRD /initrd.img
+    APPEND earlyprintk=ttyS0,115200 console=ttyS0,115200