History

Florian Klink a6580748aa feat(tvix/store/digests): use bytes::Bytes instead of Vec<u8> This will save us some copies, because a clone will simply create an additional pointer to the same data. Change-Id: I017a5d6b4c85a861b5541ebad2858ad4fbf8e8fa Reviewed-on: https://cl.tvl.fyi/c/depot/+/8978 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Autosubmit: flokli <flokli@flokli.de> Tested-by: BuildkiteCI		2023-07-21 19:01:50 +00:00
..
docs	docs(tvix/store): various improvements	2023-07-07 09:48:32 +00:00
protos	refactor(tvix/store): use bytes for node names and symlink targets	2023-07-21 19:01:49 +00:00
src	feat(tvix/store/digests): use bytes::Bytes instead of Vec<u8>	2023-07-21 19:01:50 +00:00
build.rs	refactor(tvix/store): remove needless borrow in build.rs	2023-02-15 18:40:36 +00:00
Cargo.toml	feat(tvix/store/blobsvc): add from_addr	2023-06-14 20:44:36 +00:00
default.nix	chore(tvix/store): drop separate bin package	2023-03-14 22:23:10 +00:00
README.md	docs(tvix/store): drop nar-bridge references	2023-06-09 15:33:14 +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 when needed.

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 -- daemon &
$ 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.