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>
11 files changed
tree: 7ea16e63681ad4695f7d7cd1115c0168fc553d4b
  1. .github/
  2. build/
  3. cloud/
  4. go/
  5. intellij/
  6. metropolis/
  7. net/
  8. third_party/
  9. tools/
  10. .bazelignore
  11. .bazelproject
  12. .bazelrc
  13. .bazelrc.sandboxroot
  14. .bazelversion
  15. .git-ignore-revs
  16. .gitignore
  17. BUILD.bazel
  18. CODING_STANDARDS.md
  19. go.mod
  20. go.sum
  21. LICENSE
  22. README.md
  23. SETUP.md
  24. WORKSPACE
README.md

Monogon Monorepo

This is the main repository containing the source code for the Monogon Platform.

This is pre-release software - take a look, and check back later!

Environment

Our build environment is self-contained and requires only minimal host dependencies:

  • A Linux machine or VM.
  • Bazelisk >= v1.15.0
  • A reasonably recent kernel with user namespaces enabled.
  • Working KVM with access to /dev/kvm (if you want to run tests).

Our docs assume that Bazelisk is available as bazel on your PATH.

Refer to SETUP.md for detailed instructions.

Monogon OS

Run a single node demo cluster

Build CLI and node image:

bazel build //metropolis/cli/dbg //:launch -c dbg

Launch an ephemeral test node:

bazel test //:launch -c dbg --test_output=streamed

Run a kubectl command while the test is running:

bazel-bin/metropolis/cli/dbg/dbg_/dbg kubectl describe node

Test suite

Run full test suite:

bazel test -c dbg //...