feat(tvix/store/nar): add read_nar method r/6951

This adds a function that can ingest a NAR file into a given
blob_service and directory_service, returning the root node.

Passing around the directory_putter is a bit annoying, but at least for
this linear "reading through a NAR" case, we don't need it to be clone
or sync.

Change-Id: Ia26d596f5dffc6dbd69aa39a82b59bba41685a9c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9915
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI

1 files changed, 2 insertions, 0 deletions

diff --git a/tvix/store/src/nar/mod.rs b/tvix/store/src/nar/mod.rs
index fc6805e9e758..25a9e18826c8 100644
--- a/tvix/store/src/nar/mod.rs
+++ b/tvix/store/src/nar/mod.rs
@@ -1,7 +1,9 @@
 use data_encoding::BASE64;
 use tvix_castore::{B3Digest, Error};
 
+mod import;
 mod renderer;
+pub use import::read_nar;
 pub use renderer::calculate_size_and_sha256;
 pub use renderer::write_nar;