Document dependencies of flatcar-install script

[invidian]

Current situation
One of the install method of flatcar is using flatcar-install script, which turns out depends on some binaries, which are not documented anywhere. Those binaries may not be available in all environments.

Impact
flatcar-install script may randomly fail when executed across different environments.

Ideal future situation
There should be a documentation of which binaries are used by the script.

Implementation options
Just a list of binaries (and possibly version requirements, if needed) in the documentation would be sufficient.

e.g. to run flatcar-install script from alpine Docker image, following packages needs to be installed (snippets in Dockerfile format):

FROM alpine

RUN apk add -U bash util-linux coreutils gnupg eudev

For Ubuntu, it is:

FROM ubuntu

RUN apt update && apt install -y udev gpg wget

[invidian]

NOTE: with flatcar/init@6371236, it now also require btrfs-progs on Ubuntu or btrfs-progs-extra on alpine.

[invidian]

BTW, this is sort of addressed by flatcar/init#50 ?

[krnowak]

Yeah, there are no version checks. I suppose that the documentation could point to the toolset variable in the script for the list of required tools.

[tormath1]

Hi @invidian,

Requirements for flatcar-install have been documented by a Flatcar's contributor in here: flatcar-archive/flatcar-docs#180: https://www.flatcar.org/docs/latest/installing/bare-metal/installing-to-disk/#required-dependencies

Thanks for opening this :)