History

Florian Klink 9e809e21cc feat(tvix/store): implement iteration over Directory nodes This provides a `Directory.nodes()` function, returning an iterator over all three node types in an ordered fashion. Change-Id: Ib98696c03a9db8b6c613d6e2bf5587c1ae35133f Reviewed-on: https://cl.tvl.fyi/c/depot/+/7955 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI		2023-01-31 13:29:18 +00:00
..
docs	docs(tvix/store): add README, document services and store model	2022-12-26 11:38:52 +00:00
protos	refactor(tvix/store): move protobuf build config one level up	2023-01-06 17:57:06 +00:00
src	feat(tvix/store): implement iteration over Directory nodes	2023-01-31 13:29:18 +00:00
build.rs	feat(tvix/store): implement reflection	2022-12-30 20:25:09 +00:00
Cargo.toml	refactor(tvix): introduce nix-compat crate	2023-01-31 13:26:18 +00:00
default.nix	refactor(tvix/store): move protobuf build config one level up	2023-01-06 17:57:06 +00:00
README.md	docs(tvix/store): add README, document services and store model	2022-12-26 11:38:52 +00:00

README.md

//tvix/store

This contains the code hosting the tvix-store.

For the local store, Nix realizes files on the filesystem in /nix/store (and maintains some metadata in a SQLite database). For "remote stores", it communicates this metadata in NAR (Nix ARchive) and NARInfo format.

Compared to the Nix model, tvix-store stores data on a much more granular level than that, which provides more deduplication possibilities, and more granular copying.

However, enough information is preserved to still be able to render NAR and NARInfo (handled by //tvix/nar-bridge).

More Information

Check the protos/ subfolder for the definition of the exact RPC methods and messages.

Interacting with the GRPC service manually

The shell environment in //tvix provides evans, which is an interactive REPL-based gPRC client.

You can use it to connect to a tvix-store and call the various RPC methods.

$ cargo run &
$ evans --host localhost --port 8000 -r repl
  ______
 |  ____|
 | |__    __   __   __ _   _ __    ___
 |  __|   \ \ / /  / _. | | '_ \  / __|
 | |____   \ V /  | (_| | | | | | \__ \
 |______|   \_/    \__,_| |_| |_| |___/

 more expressive universal gRPC client


tvix.store.v1@localhost:8000> service BlobService

tvix.store.v1.BlobService@localhost:8000> call Put --bytes-from-file
data (TYPE_BYTES) => /run/current-system/system
{
  "digest": "KOM3/IHEx7YfInAnlJpAElYezq0Sxn9fRz7xuClwNfA="
}

tvix.store.v1.BlobService@localhost:8000> call Get --bytes-as-base64
digest (TYPE_BYTES) => KOM3/IHEx7YfInAnlJpAElYezq0Sxn9fRz7xuClwNfA=
{
  "data": "eDg2XzY0LWxpbnV4"
}

$ echo eDg2XzY0LWxpbnV4 | base64 -d
x86_64-linux

Thanks to tvix-store providing gRPC Server Reflection (with reflection feature), you don't need to point evans to the .proto files.