60 lines
1.8 KiB
Markdown
60 lines
1.8 KiB
Markdown
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# //tvix/store
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This contains the code hosting the tvix-store.
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For the local store, Nix realizes files on the filesystem in `/nix/store` (and
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maintains some metadata in a SQLite database). For "remote stores", it
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communicates this metadata in NAR (Nix ARchive) and NARInfo format.
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Compared to the Nix model, `tvix-store` stores data on a much more granular
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level than that, which provides more deduplication possibilities, and more
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granular copying.
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However, enough information is preserved to still be able to render NAR and
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NARInfo (handled by `//tvix/nar-bridge`).
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## More Information
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Check the `protos/` subfolder for the definition of the exact RPC methods and
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messages.
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## Interacting with the GRPC service manually
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The shell environment in `//tvix` provides `evans`, which is an interactive
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REPL-based gPRC client.
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You can use it to connect to a `tvix-store` and call the various RPC methods.
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```shell
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$ cargo run &
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$ evans --host localhost --port 8000 -r repl
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______
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| ____|
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| |__ __ __ __ _ _ __ ___
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| __| \ \ / / / _. | | '_ \ / __|
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| |____ \ V / | (_| | | | | | \__ \
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|______| \_/ \__,_| |_| |_| |___/
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more expressive universal gRPC client
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tvix.store.v1@localhost:8000> service BlobService
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tvix.store.v1.BlobService@localhost:8000> call Put --bytes-from-file
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data (TYPE_BYTES) => /run/current-system/system
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{
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"digest": "KOM3/IHEx7YfInAnlJpAElYezq0Sxn9fRz7xuClwNfA="
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}
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tvix.store.v1.BlobService@localhost:8000> call Get --bytes-as-base64
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digest (TYPE_BYTES) => KOM3/IHEx7YfInAnlJpAElYezq0Sxn9fRz7xuClwNfA=
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{
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"data": "eDg2XzY0LWxpbnV4"
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}
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$ echo eDg2XzY0LWxpbnV4 | base64 -d
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x86_64-linux
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```
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Thanks to `tvix-store` providing gRPC Server Reflection (with `reflection`
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feature), you don't need to point `evans` to the `.proto` files.
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