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FROM stagex/busybox AS busybox
FROM stagex/musl AS musl
FROM stagex/xorriso AS xorriso
FROM stagex/syslinux AS syslinux
FROM stagex/cpio AS cpio
FROM stagex/linux-airgap AS linux
FROM stagex/mtools AS mtools
FROM stagex/xz AS xz
FROM stagex/grub:local AS grub
FROM scratch AS base
COPY --from=busybox . /
COPY --from=musl . /
COPY --from=xorriso . /
COPY --from=cpio . /
COPY --from=mtools . /
COPY --from=linux . /
COPY --from=syslinux . /
COPY --from=xz . /
COPY --from=grub . /
FROM base AS build
## Kernel
COPY --from=linux /bzImage iso/boot/vmlinuz
## Initramfs
COPY --from=stagex/busybox . initramfs
COPY --chmod=0755 <<-EOF initramfs/init
#!/bin/sh
/bin/sh
EOF
RUN <<-EOF
set -eux
cd initramfs
find . \
| cpio -o -H newc \
| gzip -9 \
> ../iso/boot/initramfs
EOF
## Grub (EFI Boot)
COPY <<-EOF iso/boot/grub/grub.cfg
menuentry "Linux Airgap" {
linux /boot/vmlinuz
initrd /boot/initramfs
}
EOF
COPY <<-EOF grub_early.cfg
search --no-floppy --set=root --label "Airgap"
set prefix=(\$root)/boot/grub
EOF
RUN <<-EOF
set -eux
mkdir -p iso/efi/boot
grub-mkimage \
--config="grub_early.cfg" \
--prefix="/boot/grub" \
--output="iso/efi/boot/bootx64.efi" \
--format="x86_64-efi" \
--compression="xz" \
all_video \
disk \
part_gpt \
part_msdos \
linux \
normal \
configfile \
search \
search_label \
efi_gop \
fat \
iso9660 \
cat \
echo \
ls \
test \
true \
help \
gzio
EOF
RUN <<-EOF
mformat -i iso/boot/grub/efi.img -C -f 1440 -N 0 ::
mcopy -i iso/boot/grub/efi.img iso/efi
touch -md "@0" iso/boot/grub/efi.img
EOF
## Syslinux (BIOS Boot)
COPY <<-EOF iso/boot/syslinux/syslinux.cfg
TIMEOUT 2
PROMPT -1
DEFAULT Airgap
LABEL Airgap
MENU LABEL Linux Airgap
KERNEL /boot/vmlinuz
INITRD /boot/initramfs
EOF
RUN <<-EOF
mkdir -p iso/boot/syslinux
for file in \
isohdpfx.bin \
isolinux.bin \
ldlinux.c32 \
libutil.c32 \
libcom32.c32 \
mboot.c32; \
do
mv /usr/share/syslinux/$file iso/boot/syslinux/$file || return 1
done
EOF
## Build Hybrid EFI/BIOS ISO
FROM build AS install
RUN xorrisofs \
-output airgap.iso \
-full-iso9660-filenames \
-joliet \
-rational-rock \
-sysid LINUX \
-isohybrid-mbr iso/boot/syslinux/isohdpfx.bin \
-eltorito-boot boot/syslinux/isolinux.bin \
-eltorito-catalog boot/syslinux/boot.cat \
-no-emul-boot \
-boot-load-size 4 \
-boot-info-table \
-eltorito-alt-boot \
-e boot/grub/efi.img \
-no-emul-boot \
-isohybrid-gpt-basdat \
-follow-links \
iso/
FROM scratch AS package
COPY --from=install /iso /iso
COPY --from=install /airgap.iso /