tvl-depot/tvix/README.md

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<img src="https://tvix.dev/logo.webp">
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-----------------
Tvix is a new implementation of the Nix language and package manager. See the
[announcement post][post-1] for information about the background of this
project.
Tvix is developed by [TVL][tvl] in our monorepo, the `depot`, at
[//tvix][tvix-src]. Code reviews take place on [Gerrit][tvix-gerrit], bugs are
filed in [our issue tracker][b].
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][getting-in-touch], or on our
[mailing list][].
Contributions to Tvix follow the TVL [review flow][review-docs] and
[contribution guidelines][contributing].
[post-1]: https://tvl.fyi/blog/rewriting-nix
[tvl]: https://tvl.fyi
[tvix-src]: https://cs.tvl.fyi/depot/-/tree/tvix/
[tvix-gerrit]: https://cl.tvl.fyi/q/path:%255Etvix.*
[b]: https://b.tvl.fyi
[getting-in-touch]: https://tvl.fyi/#getting-in-touch
[mailing list]: https://inbox.tvl.su
[review-docs]: https://code.tvl.fyi/about/docs/REVIEWS.md
[contributing]: https://code.tvl.fyi/about/docs/CONTRIBUTING.md
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][josh]. We do not accept code contributions or issues outside of
the tooling and communication methods outlined above.
[josh]: https://github.com/josh-project/josh
## 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
feat(tvix/nar-bridge): add nar-bridge-pathinfo command This adds an additional nar-bridge-pathinfo command. It exposes a PathInfoService for a HTTP Binary Cache, ingesting data into a BlobService/DirectoryService as it goes through the NAR file. It does this whenever it receives a Get request for a specific output path, and waits returning with the PathInfo response until it ingested the data. It does not do any sort of caching - this means it re-downloads NAR files again whenever the PathInfo is requested again, so you most likely do not want to use this currently. It's one building component as soon as we have store composition (which we currently don't, so don't use this). It can be used as an alternative mechanism to ingest data (Blobs and Directories) of a given store path from a binary cache into tvix-store. ``` ❯ nix-build -A third_party.nixpkgs.hello /nix/store/mdi7lvrn2mx7rfzv3fdq3v5yw8swiks6-hello-2.12.1 ❯ nix hash to-sri --type sha1 mdi7lvrn2mx7rfzv3fdq3v5yw8swiks6 sha1-Rs/INeK+7IGbG/u7fHoVNm96Yqs= ❯ out=$(mg build //tvix/nar-bridge) $out/bin/nar-bridge-pathinfo --log-level debug & INFO[0000] Starting nar-bridge-pathinfosvc at [::]:8001 ❯ mg run //tvix:store -- daemon & [mg] building target //tvix:store [mg] running target //tvix:store 2023-10-03T16:21:57.433739Z INFO tvix_store: tvix-store listening on [::]:8000 at src/bin/tvix-store.rs:229 ❯ evans --host localhost --port 8001 -r repl […] tvix.store.v1.PathInfoService@localhost:8001> call Get ✔ by_output_hash by_output_hash (TYPE_BYTES) => Rs/INeK+7IGbG/u7fHoVNm96Yqs= { "narinfo": { "narSha256": "sXrPtjqhSoc2u0YfM1HVZThknkSYuRuHdtKCB6wkDFo=", "narSize": "226552", "referenceNames": [ "aw2fw9ag10wr9pf0qk4nk5sxi0q0bn56-glibc-2.37-8", "mdi7lvrn2mx7rfzv3fdq3v5yw8swiks6-hello-2.12.1" ], "signatures": [ { "data": "7guDbfaF2Q29HY0c5axhtuacfxN6uxuEqeUfncDiSvMSAWvfHVMppB89ILqV8FE58pEQ04tSbMnRhR3FGPV0AA==", "name": "cache.nixos.org-1" } ] }, "node": { "directory": { "digest": "xvo6BYbYaDw76IibLu5sr+VZoj9iM0ET2RUuYSYLwKE=", "name": "bWRpN2x2cm4ybXg3cmZ6djNmZHEzdjV5dzhzd2lrczYtaGVsbG8tMi4xMi4x", "size": 141 } }, "references": [ "ptgFMIhdl2nJxMDdlDkITyXuBFc=", "Rs/INeK+7IGbG/u7fHoVNm96Yqs=" ] } ``` Change-Id: I50167d0ac081c91adf5cf2733bbc4dc0993bd46e Reviewed-on: https://cl.tvl.fyi/c/depot/+/9539 Autosubmit: flokli <flokli@flokli.de> Tested-by: BuildkiteCI Reviewed-by: Connor Brewster <cbrewster@hey.com> Reviewed-by: Brian Olsen <me@griff.name>
2023-10-03 18:08:34 +02:00
* `//tvix/nar-bridge`
* `nar-bridge-http`: A HTTP webserver providing a Nix HTTP Binary Cache interface in front of a tvix-store
* `nar-bridge-pathinfo`: A gRPC server, exposing a Nix HTTP Binary Cache as a tvix-store PathInfoService
* `//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 //tvix:crate2nixGenerate --` 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.