tree 1a21deb8bd9f51019a3d229e476b49d357356162
parent e2e0371cd685fcfa600a9ad49b29c91fba4a1261
author Serge Bazanski <serge@monogon.tech> 1639494266 +0100
committer Sergiusz Bazanski <serge@monogon.tech> 1639748713 +0000

m: {cli,installer}: runfiles through datafile.MustGet

This implements datafile, a small library to more ergonomically resolve
Bazel runfiles:

1. It also works in cases where a tool doesn't run through `bazel run`.
2. It provides a MustGet wrapper which returns already read bytes and
   removes some boilerplate at the callsite.
3. It allows us to extend the library in the future to prepare special
   'self-contained' builds of some binaries, for example to bundle the
   installer kernel in metroctl.

We then use this library to simplify the installer and installer tests.
In the installer, we technically remove the ability to specify arbitrary
kernels/bundles on the command line, but is this functionality actually
useful?

Change-Id: I46155b9951729c810e0d36930b470edfdfd82943
Reviewed-on: https://review.monogon.dev/c/monogon/+/484
Reviewed-by: Mateusz Zalega <mateusz@monogon.tech>