Add output types for BIOS and EFI ISOs

Note that the EFI ISO is not yet automatically sized, and the
kernel command lines are currently hard coded in the builders.

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

tools/mkimage-iso-efi/Dockerfile

@@ -0,0 +1,15 @@
+FROM alpine:3.5
+
+RUN \
+  apk update && apk upgrade && \
+  apk add --no-cache \
+  libarchive-tools \
+  binutils \
+  gummiboot \
+  mtools \
+  xorriso \
+  && true
+
+COPY . .
+
+CMD [ "/make-efi" ]

tools/mkimage-iso-efi/Makefile

@@ -0,0 +1,29 @@
+.PHONY: tag push
+
+BASE=alpine:3.5
+IMAGE=mkimage-iso-efi
+
+default: push
+
+hash: Dockerfile make-efi
+	DOCKER_CONTENT_TRUST=1 docker pull $(BASE)
+	tar cf - $^ | docker build --no-cache -t $(IMAGE):build -
+	docker run --rm --entrypoint /bin/sh $(IMAGE):build -c 'cat $^ /lib/apk/db/installed | sha1sum' | sed 's/ .*//' > $@
+
+push: hash
+	docker pull mobylinux/$(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:

tools/mkimage-iso-efi/make-efi

@@ -0,0 +1,73 @@
+#!/bin/sh
+
+set -e
+
+mkdir -p /tmp/efi
+cd /tmp/efi
+
+# input is a tarball of vmlinuz64 and initrd.img on stdin
+# output is an iso on stdout
+
+# extract. BSD tar auto recognises compression, unlike GNU tar
+# only if stdin is a tty, if so need files volume mounted...
+[ -t 0 ] || bsdtar xzf -
+
+INITRD="$(find . -name '*.img')"
+KERNEL="$(find . -name vmlinuz64 -or -name bzImage)"
+
+[ "$KERNEL" = "vmlinuz64" ] || mv "$KERNEL" vmlinuz64
+[ "$INITRD" = "initrd.img" ] || mv "$INITRD" initrd.img
+
+# clean up subdirectories
+find . -mindepth 1 -maxdepth 1 -type d | xargs rm -rf
+
+# Docker for Windows specific options, should be moved
+WINDOWS_OPTIONS="mobyplatform=windows vsyscall=emulate page_poison=1 panic=1 rootdelay=300 noautodetect"
+
+# Create a EFI boot file with kernel and initrd. From:
+# https://github.com/haraldh/mkrescue-uefi/blob/master/mkrescue-uefi.sh
+cp /usr/lib/gummiboot/linuxx64.efi.stub .
+echo "earlyprintk=ttyS0,115200 console=ttyS0,115200 $WINDOWS_OPTIONS" > cmdline.txt
+
+objcopy \
+	--add-section .osrel=/etc/os-release --change-section-vma .osrel=0x20000 \
+	--add-section .cmdline=./cmdline.txt --change-section-vma .cmdline=0x30000 \
+	--add-section .linux=./vmlinuz64 --change-section-vma .linux=0x40000 \
+	--add-section .initrd=initrd.img --change-section-vma .initrd=0x3000000 \
+	./linuxx64.efi.stub \
+	mobylinux.efi
+
+# create a ISO with a EFI boot partition
+mkdir -p iso
+dd if=/dev/zero of=iso/efi.raw bs=1024 count=78000
+mkfs.vfat iso/efi.raw
+
+echo "mtools_skip_check=1" >> /etc/mtools.conf && \
+mmd -i iso/efi.raw ::/EFI
+mmd -i iso/efi.raw ::/EFI/BOOT
+mcopy -i iso/efi.raw mobylinux.efi ::/EFI/BOOT/BOOTX64.EFI
+
+xorriso -as mkisofs \
+	-R -f -e efi.raw -no-emul-boot -o mobylinux-efi.iso iso
+
+cat mobylinux-efi.iso
+
+# How to build a VHDX. Commented out because we are currently not using it
+# Don't delete: It took too long to figure out how to do this...
+# # create a disk image (150MB)
+# # This is a little odd, as we run this as part of the default command.
+# # Can't run this during the build step as it requires privilege.
+# # The Magic numbers in losetup are startsector (2048) times 512 and
+# # (endsector - startsector) * 512
+# CMD cd /tmp/efi && \
+#     dd if=/dev/zero of=disk.raw bs=1024 count=51200 && \
+#     sgdisk -N 1 -t 1:ef00 disk.raw && \
+#     losetup -o 1048576 --sizelimit 51362816 /dev/loop/1 disk.raw && \
+#     mkfs.vfat /dev/loop/1 && \
+#     echo "drive c: file=\"/dev/loop/1\" mtools_skip_check=1" > /etc/mtools.conf && \
+#     mmd c:/EFI && \
+#     mmd c:/EFI/BOOT && \
+#     mcopy mobylinux.efi c:/EFI/BOOT/BOOTX64.EFI && \
+#     losetup -d /dev/loop/1 && \
+#     qemu-img convert -O vhdx disk.raw mobylinux-boot.vhdx && \
+#     cp /tmp/efi/mobylinux.efi /tmp/efi/mobylinuxefi.iso /tmp/efi/mobylinux-boot.vhdx /mnt/