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ref #10042

add all_video

ref #9549

this is needed for firware which is not automatically detected.

Alpine ISO are labelled with ${profile_abbrev:-$PROFILE} but grub was only
searching for $PROFILE when booting and failed to its rescue shell.

ext4 module can handle it.

Apply missing changes from f92a41f7

Also remove unused variable

The volume id cannot be longer than 32 bytes so we need to shorten it a
bit

If Xen is present and Grub is used, like on UEFI systems, use multiboot2
to load Xen and the dom0 linux kernel.

Enable grub modules:
 * part_gpt: to read files from GPT partitions
 * multiboot2: to load multiboot2 kernels, like Xen
 * gzio: to load Xen which is gzip compressed

ISO image should have files owned by root, not leaking the builder uid.

standard iso is now vanilla kernel so it does not make any sense to have
a separata vanilla iso.

Also update xen to use vanilla kernel instead of hardened

since commit 697e3045 the vanilla kernel
has a flavor suffix on vmlinuz. Adjust the boot loader configs
accordingly.

we need add a dependency that provides /bin/sh

Strictly the 'efi' folder is not needed since it's in the efi.img.
However, converting .iso to USB stick is a lot simpler when the
EFI folder is in the .iso too. This allows just copying .iso contents
to the USB stick and EFI boot will work. While Rufus supports
extracting the boot files from efi.img, it was considered more
portable to add the copy. This also simplifies updating setup-bootable
to prepare EFI bootable disks.

- use efi.img as the image name (Rufus recognizes it)
- drop need for dosfstools, use mformat from mtools instead

Most other distros seems to do this

set console=hvc0 via boot option. This configuration make init to add
hvc0 to /etc/inittab and /etc/securetty. This is needed to allow login
with 'root' user.

To boot ppc64le we need to use grub with ieee1275 platform. Said that,
a new section to support grub ieee1275 was created.
Also needed to change xorrisofs command by grub-mkrescue, that is the one
used to create a bootable image for power and it is also a wrapper to xorriso.

not enabled yet, but uncommenting the grub_mod should enable
building of isolinux+grubefi hybrid images. once uefi boot works
and is verified on aarch64, we can enable the vanilla iso image
(grsec does not support aarch64).

search for apkovl script in current dir, in ~/.mkimg and in the dir
where the mkimage script was started from.

the boot repositry needs to be signed with a key. We explicitly copy
this to initramfs so users don't need use --hostkeys which requires
access to /etc/apk/keys/

without the key in intramfs the boot repository will be useless