refactor(tvix/src/nar): drop NARCalculationService r/6270

There's only one way to calculate NAR files, by walking through them.

Things like caching such replies should be done closer to where we use
these, composing NARCalculationService doesn't actually give us much.

Instead, expose two functions, `nar::calculate_size_and_sha256` and
`nar::writer_nar`, the latter writing NAR to a writer, the former using
write_nar to only keeping the NAR size and digest.

Change-Id: Ie5d2cfea35470fdbb5cbf9da1136b0cdf0250266
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8723
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>

1 files changed, 2 insertions, 11 deletions

diff --git a/tvix/cli/src/main.rs b/tvix/cli/src/main.rs
index 459177717c..0a1794006d 100644
--- a/tvix/cli/src/main.rs
+++ b/tvix/cli/src/main.rs
@@ -73,20 +73,11 @@ fn interpret(code: &str, path: Option<PathBuf>, args: &Args, explain: bool) -> b
 
     let blob_service = MemoryBlobService::default();
     let directory_service = MemoryDirectoryService::default();
-    let path_info_service = MemoryPathInfoService::default();
-    let nar_calculation_service = tvix_store::nar::NonCachingNARCalculationService::new(
-        Box::new(blob_service.clone()),
-        directory_service.clone(),
-    );
+    let path_info_service = MemoryPathInfoService::default(); // TODO: update to pass in blob and directory svc
 
     eval.io_handle = Box::new(tvix_io::TvixIO::new(
         known_paths.clone(),
-        tvix_store::TvixStoreIO::new(
-            Box::new(blob_service),
-            directory_service,
-            path_info_service,
-            nar_calculation_service,
-        ),
+        tvix_store::TvixStoreIO::new(Box::new(blob_service), directory_service, path_info_service),
     ));
 
     // bundle fetchurl.nix (used in nixpkgs) by resolving <nix> to