This repository contains my extremely experimental, not-production-ready, outright dangerous work that is all based around Jujutsu.

The code here is different than the code I contribute directly to upstream; the work here is too experimental for now. Perhaps one day this repository might be obsolete and most of my work will all be in Jujutsu itself. But for now having a separate repository is the best way to iterate quickly without disturbing everyone and while researching, and in practice I'll always want a laboratory to cook things up.

In short, you probably don't want to bother with this stuff unless you're direcly working with me on it, so you know what you're up against.

This project uses Buck2 for the build system and has significant infrastructure to drive it. One goal — among others — is to explore build system <-> filesystem <-> version control integration, and this requires a system like Buck to achieve (so using it is a good way to figure that out.)

If you have questions or want to help out, you can contact me, @aseipp, on the Jujutsu Discord.

Broadly unorganized and in no particular order.

TBD.

TBD.

• Toolchains
  • Hermetic toolchain
    • Rust
    • Clang (all platforms)
    • Windows
      • Is hermetic MSVC possible?
• DevEx improvements
  • Turnkey Codespaces for instant-hacking
    • Pre-warmed/Pre-built devcontainer
      • Current boot time is ~several minutes on a cold start
    • Tested on macOS, Windows, Linux
    • devcontainer that can be launched from GitHub UI
    • dotslash, rust-analyzer, buck2, rust-project preinstalled
    • Working buck2 build/rust-analyzer support on first click
      • Fixed by facebook/buck2@da5ede70e160dbc2c2ec948a16b57f9ac9ba165f
  • Target Determination
    • supertd is available (from buck2-change-detector)
  • Dependency monitoring + security updates
    • Dependabot integration with our third-party Cargo.toml?
      • How would we run reindeer buckify?
    • osv.dev integration?
      • RUSTSEC support based on Cargo.lock
      • Generic 3rd party support (BoringSSL, zstd, etc)
        • Still needs testing: mimalloc, capnproto, zlib
      • Open issues:
        • Querying Git Repos google/osv.dev#2576
• Platform support
  • macOS
    • x86_64 macOS support
      • Requires x86_64 binaries for smoltar; needs macos-13 runners
  • Windows
    • aarch64-windows support
      • Should come in Q4 2024 when GHA runners are available?
    • windows_shim for DotSlash, improving Windows ergonomics
      • Requires committing .exe files, so size is absolutely critical
      • Does not exist upstream; TBA

Upstream bugs and PRs:

• Offline build support — unclear how to proceed
  • Import 3rd party library source code into the repository?
  • Reindeer support for .crate files: facebookincubator/reindeer#46
• Log & build reporting
  • buck log --trace-id ... OSS support: facebook/buck2#770
    • Patched in https://github.com/thoughtpolice/buck2 fork used by this repo.
    • Can replay any GHA build (within ~24hrs) with a known Build ID
    • facebook/buck2#702
  • Bazel Event Stream support: facebook/buck2#811
    • See also: facebook/buck2#685
    • Will allow us to abstract away underlying CI to some extent
• RE/AC support:
  • rust_library caching for local_only=True (TBA)
  • Missing support for local execution ActionCache support
    • Patched in https://github.com/thoughtpolice/buck2 fork used by this repo.
    • facebook/buck2#765
    • facebook/buck2#771
  • Wrong hashing algorithm used for upload permission checks facebook/buck2#784
    • Patched in https://github.com/thoughtpolice/buck2 fork used by this repo.
  • Block on concurrent blob uploads facebook/buck2#750
    • Patched in https://github.com/thoughtpolice/buck2 fork used by this repo.
  • File size logic bugs facebook/buck2#639
  • Buggy concurrency limiter: facebook/buck2#642
  • Failure diagonstics facebook/buck2#656
• rust-analyzer + rust-project
  • rust-project: add support for specifying buck2 exe facebook/buck2#774
  • linked_projects support: rust-lang/rust-analyzer#17246
  • Unbreak OSS use of rust-project: facebook/buck2#659
  • --sysroot-mode support for rust-project: facebook/buck2#745
  • rust-project check is broken: facebook/buck2#754
  • Invalid dep graph due to lack of sysroot_src
  • Prebuilt rust-project binaries + dotslash: facebook/buck2#766
• UX improvements
  • buck2 test should build targets too facebook/buck2#702
  • Aggressively annoying download warnings facebook/buck2#316
    • Patched in https://github.com/thoughtpolice/buck2 fork used by this repo.
  • Improve ValidationInfo failure messages facebook/buck2#769
  • Add subtarget information to test name facebook/buck2#743
• Platform support
  • buck2 aarch64-linux binaries don't with 16k page size facebook/buck2#693

Apache 2.0.