History

Florian Klink c77c7ae9a5 fix(tvix/store/blobservice/seeker): fix debug assert We were asserting absolute_offset > self.pos, but that's not true for both being zero. Ramp up the tracing bits a bit, so we actually can see this in the debug logs. Change-Id: I21693bcafab227549b19cd6f1215d2f8dee77ecc Reviewed-on: https://cl.tvl.fyi/c/depot/+/9292 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Reviewed-by: Connor Brewster <cbrewster@hey.com> Autosubmit: flokli <flokli@flokli.de> Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>		2023-09-12 12:15:08 +00:00
..
docs	docs(tvix/store): various improvements	2023-07-07 09:48:32 +00:00
protos	fix(tvix/protos): support []byte node names	2023-09-09 12:13:02 +00:00
src	fix(tvix/store/blobservice/seeker): fix debug assert	2023-09-12 12:15:08 +00:00
build.rs	feat(tvix/store/proto): use Bytes instead of Vec<u8>	2023-07-22 09:03:02 +00:00
Cargo.toml	feat(tvix/store): fix ctrl-c handling on mount command	2023-09-05 21:13:49 +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.