QEMU for riscv virt machine passes its own DTB. Overriding DTB breaks
Linux loading.

ttySI0 was a name of HiFive Unleashed serial console. It was changed to
ttySIF0.

The intention behind this commit to allow user to get all needed stuff
to launch a particular image inside QEMU without need to download the
firmware from the net or in a case of booting procedure change in
future.

Another workaround for https://bugzilla.altlinux.org/show_bug.cgi?id=39663

Education rescue does not require wireless support.

startup soon won't be installed by anyone.

isolinux supports Hardware Detection Tool.

As new exfat filesystem is merged into linux-5.7 kernel, exfatprogs is
created as an official userspace utilities that contain all of the standard
utilities for creating and fixing and debugging exfat filesystem in linux
system. fuse-exfat not needed.

This is necessary for kernels 5.10 and higher on systems with sysvinit,
since no one else on these systems except this service will mount
evivars in /sys/firmware/efi/efivars.

Also needed for livecd.

cmac.ko needed for use SMB2 and newer.
Reported-by: sin@

The base font is needed not only in the installer, but also in the
installed system, since the final steps start alterator from the
installed system.
use/fonts/system leave as an alias.

squashfs built with this option are not loaded with modern kernels.

Sorting profiles was a mistake. stage1 must run ahead of the stage2
subprofiles, as this is the stage where the squash compression
settings are configured.
See-also:
commit da65dc2f
https://lists.altlinux.org/pipermail/devel-distro/2021-March/002319.html

List base+regular+extra contains lvm, mdadm, which are not needed
in rootfs.

So that you can not add them to rootfs.

In mkimage 0.2.41 it is implemented only for mki-pack-efionly-isoboot,
mki-pack-grubpc-isoboot, mki-pack-isoboot.

By default, when building an image, xorriso generates
an image UUID of the form YYYY-MM-DD-hh-mm-ss-cc
from the current time.
If the xorriso command line has a parameter
-volume_date uuid YYYYMMDDhhmmsscc
then the UUID of the image is generated from it.
This feature reads the current time and creates variables:
UUID_ISO containing YYYY-MM-DD-hh-mm-ss-cc
UUID_ISO_SHRT containing YYYYMMDDhhmmsscc
Also add 60-cdrom_id.rules to initrd
This allows to identify CD/DVD by UUID
and use to boot the installer
method:disk,uuid:YYYY-MM-DD-hh-mm-ss-cc

See-also: https://lists.altlinux.org/pipermail/community/2021-March/688298.html