tvl-depot/tvix
Aspen Smith 98b89e53e2 test(tvix/eval): Add test asserting size of Value
Now that I've done a ton of things to make sure Value is small on the
stack (16 bytes, which is a perfectly reasonable size for a programming
language Value enum), add a test asserting it stays that way.

These size improvements have a measurable impact, too - here's the
`hello outpath` benchmark compared between canon (as of r/7495) and this
commit:

hello outpath time:   [990.56 ms 995.83 ms 1.0070 s]
              change: [-7.1397% -6.1302% -5.1651%] (p = 0.00 < 0.05)
              Performance has improved.

Change-Id: If99a0976eab28eb5e516fcd2f4a0e068145af23e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10799
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
2024-02-13 16:49:53 +00:00
..
.vscode chore(tvix): fix vscode rust-analyzer recommendation 2022-10-15 16:54:28 +00:00
boot refactor(tvix/nar-bridge): mv nar-bridge{,-http} 2023-10-05 06:17:10 +00:00
build feat(tvix/build): add CLI entrypoint 2024-01-15 18:54:35 +00:00
build-go chore(3p/sources): Bump channels & overlays 2024-01-19 21:47:32 +00:00
castore feat(tvix/castore/blobsvc): add Chunked{Blob,Reader} 2024-02-10 14:24:51 +00:00
castore-go chore(3p/sources): Bump channels & overlays 2024-01-19 21:47:32 +00:00
cli fix(tvix): Represent strings as byte arrays 2024-01-31 14:51:49 +00:00
docs docs(tvix/docs): add document about drvPath differences 2023-08-20 22:08:02 +00:00
eval test(tvix/eval): Add test asserting size of Value 2024-02-13 16:49:53 +00:00
glue feat(tvix/eval): Box Value::Catchable 2024-02-13 16:49:53 +00:00
nar-bridge feat(tvix/store/nar-info): Support async blob upload 2024-01-23 17:01:16 +00:00
nix-compat fix(nix-compat): accept SRI hashes of invalid length 2024-01-20 17:14:30 +00:00
nix-lang-test-suite docs(tvix): initial notes on a possible generic Nix lang test suite 2024-01-22 14:21:19 +00:00
scripts chore(tvix): Run criterion benchmarks for the whole workspace 2023-12-20 18:04:43 +00:00
serde refactor(tvix/eval): Box Value::String 2024-02-02 16:16:56 +00:00
store docs(tvix/store/pathinfosvc): document nix+http[s] 2024-02-05 18:40:52 +00:00
store-go chore(3p/sources): Bump channels & overlays 2024-01-19 21:47:32 +00:00
tools chore(tvix/tools/turbofetch): bump magic-buffer to 0.1.1 2024-02-07 20:03:24 +00:00
verify-lang-tests feat(tvix/eval): strengthen significantly catchable test suite 2024-02-10 15:34:15 +00:00
website feat(tvix/website): Link to windtunnel results page 2023-12-23 17:12:25 +00:00
.gitignore chore(tvix): add /*.sled to .gitignore 2023-09-24 17:05:48 +00:00
buildkite.yml chore(tvix): move buildkite.yml from views/tvix to tvix/ 2023-10-25 08:22:57 +00:00
Cargo.lock fix(tvix): Represent strings as byte arrays 2024-01-31 14:51:49 +00:00
Cargo.nix fix(tvix): Represent strings as byte arrays 2024-01-31 14:51:49 +00:00
Cargo.toml chore(tvix): switch to upstream futures 0.3.30 2023-12-24 21:45:04 +00:00
clippy.toml chore(tvix): add missing clippy attributes & config 2023-11-05 20:28:38 +00:00
crate-hashes.json chore(tvix): switch to upstream futures 0.3.30 2023-12-24 21:45:04 +00:00
default.nix fix(tvix): fix build on darwin 2024-02-06 19:10:59 +00:00
LICENSE chore(tvix): Bootstrap Tvix folder 2021-03-27 00:09:49 +00:00
logo.webp refactor(tvix): move logo to //tvix:logo 2023-09-10 13:13:14 +00:00
OWNERS chore(depot): update OWNERS files for aspen 2023-12-20 18:35:58 +00:00
README.md refactor(tools): move crate2nix generate here 2024-01-18 15:02:15 +00:00
shell.nix chore(tvix/shell): add cargo-expand to debug proc-macro 2024-01-18 12:29:46 +00:00


Tvix is a new implementation of the Nix language and package manager. See the announcement post for information about the background of this project.

Tvix is developed by TVL in our monorepo, the depot, at //tvix. Code reviews take place on Gerrit, bugs are filed in our issue tracker.

For more information about Tvix, feel free to reach out. We are interested in people who would like to help us review designs, brainstorm and describe requirements that we may not yet have considered.

Most of the discussion around development happens on our IRC channel, which you can join in several ways documented on tvl.fyi, or on our mailing list.

Contributions to Tvix follow the TVL review flow and contribution guidelines.

WARNING: Tvix is not ready for use in production. None of our current APIs should be considered stable in any way.

WARNING: Any other instances of this project or repository are josh-mirrors. We do not accept code contributions or issues outside of the tooling and communication methods outlined above.

Components

This folder contains the following components:

  • //tvix/castore - subtree storage/transfer in a content-addressed fashion
  • //tvix/cli - preliminary REPL & CLI implementation for Tvix
  • //tvix/eval - an implementation of the Nix programming language
  • //tvix/nar-bridge
    • nar-bridge-http: A HTTP webserver providing a Nix HTTP Binary Cache interface in front of a tvix-store
  • //tvix/nix-compat - a Rust library for compatibility with C++ Nix, features like encodings and hashing schemes and formats
  • //tvix/serde - a Rust library for using the Nix language for app configuration
  • //tvix/store - a "filesystem" linking Nix store paths and metadata with the content-addressed layer

Some additional folders with auxiliary things exist and can be explored at your leisure.

Building the CLI

The CLI can also be built with standard Rust tooling (i.e. cargo build), as long as you are in a shell with the right dependencies.

  • If you cloned the full monorepo, it can be provided by mg shell //tvix:shell.
  • If you cloned the tvix workspace only (git clone https://code.tvl.fyi/depot.git:workspace=views/tvix.git), nix-shell provides it.

If you're in the TVL monorepo, you can also run mg build //tvix/cli (or mg build from inside that folder) for a more incremental build.

Please follow the depot-wide instructions on how to get mg and use the depot tooling.

Compatibility

Important note: We only use and test Nix builds of our software against Nix 2.3. There are a variety of bugs and subtle problems in newer Nix versions which we do not have the bandwidth to address, builds in newer Nix versions may or may not work.

Rust projects, crate2nix

Some parts of Tvix are written in Rust. To simplify the dependency management on the Nix side of these builds, we use crate2nix in a single Rust workspace in //tvix to maintain the Nix build configuration.

When making changes to Cargo dependency configuration in any of the Rust projects under //tvix, be sure to run mg run //tools:crate2nix-generate in //tvix itself and commit the changes to the generated Cargo.nix file. This only applies to the full TVL checkout.

License structure

All code implemented for Tvix is licensed under the GPL-3.0, with the exception of the protocol buffer definitions used for communication between services which are available under a more permissive license (MIT).

The idea behind this structure is that any direct usage of our code (e.g. linking to it, embedding the evaluator, etc.) will fall under the terms of the GPL3, but users are free to implement their own components speaking these protocols under the terms of the MIT license.