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feat(tvix/store): add write_nar function

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This adds a function that consumes a [proto::node::Node] pointing to the
root of a (store) path, and writes the contents in NAR serialization to
the passed [std::io::Write].

We need this in various places:

 - tvix-store's calculate_nar() RPC method needs to render a NAR stream
   to get the nar hash, which is necessary to give things imported in
   the store a "NAR-based" store path.

 - communication with (remote) Nix (via daemon protocol) needs a NAR
   representation.

 - Things like nar-bridge, exposing a NAR/NARInfo HTTP interface need a
   NAR representation.

Change-Id: I7fb2e0bf01814a1c09094c0e35394d9d6b3e43b6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7956
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
This commit is contained in:
Florian Klink 2023-01-29 20:48:23 +01:00 • committed by flokli
parent a23b7e17c0
commit 0db73cb2bd
6 changed files with 351 additions and 22 deletions
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22
tvix/Cargo.nix
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@ -83,16 +83,6 @@ rec {
# File a bug if you depend on any for non-debug work!
debug = internal.debugCrate { inherit packageId; };
};
"tvix-nar" = rec {
packageId = "tvix-nar";
build = internal.buildRustCrateWithFeatures {
packageId = "tvix-nar";
};
# Debug support which might change between releases.
# File a bug if you depend on any for non-debug work!
debug = internal.debugCrate { inherit packageId; };
};
"tvix-serde" = rec {
packageId = "tvix-serde";
build = internal.buildRustCrateWithFeatures {
@ -7971,18 +7961,6 @@ rec {
}
];
};
"tvix-nar" = rec {
crateName = "tvix-nar";
version = "0.0.0";
edition = "2021";
# We can't filter paths with references in Nix 2.4
# See https://github.com/NixOS/nix/issues/5410
src =
if (lib.versionOlder builtins.nixVersion "2.4pre20211007")
then lib.cleanSourceWith { filter = sourceFilter; src = ./nar; }
else ./nar;
};
"tvix-serde" = rec {
crateName = "tvix-serde";