Draft: add examples/debvm-create-grub

Johannes Schauer Marin Rodriguesrequested to merge
debvm-create-grub into main

In the same style of debvm-create and debvm-run, debvm-create-grub is a thin wrapper around debvm-create and all options given to debvm-create-grub are passed down to debvm-create (except for the --boot, --output and --help options).

In contrast to debvm-create, debvm-create-grub creates a disk image that includes a partition table and bootloader (grub). This has the advantage over debvm-create, that the resulting images

  • do not require debvm-run but
  • can be directly used with qemu-system-*, libvirt or autopkgtest-virt-qemu.

This has the disadvantage over debvm-create that the resulting images

  • do not work with debvm-run
  • can never be bit-by-bit identical
  • only work on platforms for which there is grub

Example how to create an image for autopkgtest-virt-qemu:

examples/debvm-create-grub --size 2G --output=rootfs.img -- \
    --architecture=arm64 \
    --include linux-image-generic \
    --customize-hook='env AUTOPKGTEST_BUILD_QEMU=1 /usr/share/autopkgtest/setup-commands/setup-testbed "$1"'

Without the --boot option, its default (auto) will select efi for arm*, bios for x86 and ieee1275 for ppc64el.

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