tree 7ea16e63681ad4695f7d7cd1115c0168fc553d4b
parent 4599aa2dfa42a7b694ad295bc700db03de96d7f5
author Lorenz Brun <lorenz@monogon.tech> 1687794764 +0200
committer Lorenz Brun <lorenz@monogon.tech> 1688035298 +0000

m/p/efivarfs: refactor

This accomplishes three things:

First, split out the variable access layer from the rest of the code.
This cleans up the attribute handling, which is now done centrally as
well as making the high-level functions very short and clean. They now
also return better errors.

Second this introduces proper types for LoadOption, which can now also
be unmarshaled which was a requirement for A/B updates. This required
implementation of EFI's DevicePath structure.
While refactoring the higher-level functions for this, this also
fixes a bug where the variable index (the 4 hex nibbles at the end) were
improperly generated as lowercase hex.

Third, this adds new high-level functions for interacting with more
boot-related variables needed for the A/B effort.

Change-Id: I53490fa4898a5e7a5498ecc05a9078bd2d66c26e
Reviewed-on: https://review.monogon.dev/c/monogon/+/1855
Tested-by: Jenkins CI
Reviewed-by: Serge Bazanski <serge@monogon.tech>