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the metadata for the raid on boot partition will be at the end of
device, so it will work to boot. It is also tested and works.

We want have fewer features in the initfs and only add those that are
needed and detected.

This is a revert of 25c4933f

we fix this by unsetting BOOTLOADER for all data only setups.

also fix potential issue where we may have multiple swap devices

New features:

* auto detect EFI boot and install EFI ESP (force with env USE_EFI=1)
* allow specifying bootloader by env BOOTLOADER (grub or syslinux)
* allow specifying disk label by env DISKLABEL (dos or gpt)

TODO:

* Make sure MBR is only overwritten on native installs.
* Do some more checks to prevent non standard/supported setup
  like GPT on BIOS installs.

TESTS run on ESXi 6.5:

Simple native install

* syslinux OK
* GRUB OK

Extended native install

* LVM OK
* RAID OK
* RAID+LVM OK

EFI install

* Default OK
* LVM OK see: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=592834
* RAID NOT SUPPORTED

Data install DOS

* Default OK
* LVM OK

Data install GPT

* Default OK
* LVM OK but: /lib/rc/sh/openrc-run.sh: line 273:
  can't create /sys/fs/cgroup/openrc/syslog/tasks: nonexistent directory

ref #7524

- move extlinux_raidopt to setup_syslinux and pass bootdev instead
- pass kernel_opts to grub config too
- make sure to quote the args to setup_grub/syslinux

This patch allows to install Alpine in the disk on ppc64le.
It installs grub and also configure the 'PowerPC PReP boot'
partition correctly.

For now the installation is enabled by selecting 'sys' option (same
option used for syslinux) in the setup options.

needed for zfs

pv-grub does not support 64bit in ext4. We will likely never need a 16T
boot partition so let us just disable 64bit for /boot.

ref #6962

fixes #2876

ref #5719

give the opportunity to set extra opts fo mkfs

The filesystem may be compiled into the kernel

filter out ramX block devices (major=1)

We should not start modloop when system root is on disk.

Do not install e2fsprogs unless it will be used

when we have a device like /dev/mapper/vg0-lv_root, then will the LV
name not match with lvs' first column.

fix typo in btrfs-progs. add kernel module eary so /dev/btrfs-control is
created.

ref #4445

ref #4421

Give the option so enable lvm when asking how o use selected disk

the use of \+ is a GNU BRE extension that is not supported in musl.