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If you run 'setup-disk /dev/sda /dev/sdb ...' then automatically set
up raid, even if no -r option was specified. If more than 2 disks
are specified then use raid5, otherwise use raid1.

ask first what disk to use, and then after how to use it.

ref #558

And initial work for data-only disk support.

This reverts commit a04a2d18.

code is a bit messy. needs a cleanup. but its a start.

We check if its shared with previous file. If it is, we try create
a hardlink or we clone it. This should work in most cases.

We need to fix it first.

- ask for timezone after root password (before we start syslog)
- rephrase the questinos and fix input prompt to be on same line

- use alpine version from /etc/alpine-release
- dont ask for testing repo, but just add it commented
- give user option to edit file manually
- give user opptortunity to add several mirrors
- first time default is 'detect fastest', second default is 'done'
- only update apk index if anything changed

apk update -q will output error if any and be quiet otherwise.
we dont need extra logic to fish out error messages.

We only need the hostname after we found the mirror we want

saves a fork

Might be handy if we want count differently, strip comments etc in future

use get_hostname_from_url function to make it more readable

- allow override MIRRORS via env var
- don't error if MIRRORS.txt is missing
- other minor cleanups

A tool for extracting files from iso images frrom a stream.

Will be used for setup-bootable.

Use case ... in instead of if ... elif ...

fix typo when calling setup-timezone