m/p/devicemapper: make parameter encoding part of package

The DM kernel interface gets a single parameter string for each DM
target in a table but internally the kernel immediately decodes it into
an argv-style list of string arguments. Because everything needs to do
it and it can be quite hard to get right, let's make it part of the
devicemapper package. Properly encoding this also means you get
actionable errors when you pass invalid data instead of weird kernel
errors or misbehavior.

Change-Id: I8060871a7459183c0395e5e4e8aac517544b2e87
Reviewed-on: https://review.monogon.dev/c/monogon/+/309
Reviewed-by: Sergiusz Bazanski <serge@monogon.tech>
4 files changed
tree: b07722231a9cf0fd3c0b81486bd637e11cbd7b6b
  1. build/
  2. intellij/
  3. metropolis/
  4. scripts/
  5. third_party/
  6. .bazelignore
  7. .bazelproject
  8. .bazelrc
  9. .git-ignore-revs
  10. .gitignore
  11. BUILD
  12. LICENSE
  13. README.md
  14. WORKSPACE
README.md

Monogon Monorepo

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

⚠️ This is pre-release software that happens to be publicly available. Nothing to see here, please move along.

Environment

Our build environment requires a working Podman binary (your distribution should have one).

Usage

Spinning up: scripts/create_container.sh

Spinning down: scripts/destroy_container.sh

Running commands: scripts/run_in_container.sh <...>

Using bazel using a wrapper script: scripts/bin/bazel <...> (add to your local $PATH for convenience)

IntelliJ

This repository is compatible with the IntelliJ Bazel plugin, which enables full autocompletion for external dependencies and generated code. All commands run inside the container, and necessary paths are mapped into the container.

The following steps are necessary:

  • Install Google's Bazel plugin in IntelliJ. On IntelliJ 2020.3 or later, you need to install a beta release of the plugin.

  • Add the absolute path to your ~/.cache/bazel-monogon folder to your idea64.vmoptions (Help → Edit Custom VM Options) and restart IntelliJ:

    -Dbazel.bep.path=/home/leopold/.cache/bazel-monogon

  • Set "Bazel Binary Location" in Other Settings → Bazel Settings to the absolute path of scripts/bin/bazel. This is a wrapper that will execute Bazel inside the container.

  • Use File → Import Bazel project... to create a new project from .bazelproject.

After running the first sync, everything should now resolve in the IDE, including generated code.

Metropolis

Run a single node cluster

Launch the node:

scripts/bin/bazel run //:launch

Run a kubectl command:

scripts/bin/bazel run //metropolis/cli/dbg -- kubectl describe

Run tests:

scripts/bin/bazel test //...