refactor(tvix/nar-bridge): do root directory dgst check in uploader r/6709

This check makes more sense there, and gives stronger semantics - Done()
only succeeds if the other side successfully received everything, *and*
came up with the same hashes as we did.

Change-Id: I20b706961053fd00d22cc70e1c8cc859705587e0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9542
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: Connor Brewster <cbrewster@hey.com>

1 files changed, 1 insertions, 20 deletions

diff --git a/tvix/nar-bridge/pkg/pathinfosvc/server.go b/tvix/nar-bridge/pkg/pathinfosvc/server.go
index 0b573d2131..545966b204 100644
--- a/tvix/nar-bridge/pkg/pathinfosvc/server.go
+++ b/tvix/nar-bridge/pkg/pathinfosvc/server.go
@@ -200,31 +200,12 @@ func (p *PathInfoServiceServer) Get(ctx context.Context, getPathInfoRequest *sto
 
 	// Close the directories uploader. This ensures the DirectoryService has
 	// properly persisted all Directory messages sent.
-	directoriesPutResponse, err := directoriesUploader.Done()
-	if err != nil {
+	if _, err := directoriesUploader.Done(); err != nil {
 		log.WithError(err).Error("error during directory upload")
 
 		return nil, status.Error(codes.Internal, "error during directory upload")
 	}
 
-	// If we uploaded directories (so directoriesPutResponse doesn't return null),
-	// the RootDigest field in directoriesPutResponse should match the digest
-	// returned in importedPathInfo.
-	// This check ensures the directory service came up with the same root hash as we did.
-	if directoriesPutResponse != nil {
-		rootDigestPathInfo := pathInfo.GetNode().GetDirectory().GetDigest()
-		rootDigestDirectoriesPutResponse := directoriesPutResponse.GetRootDigest()
-
-		log := log.WithFields(logrus.Fields{
-			"root_digest_pathinfo":             rootDigestPathInfo,
-			"root_digest_directories_put_resp": rootDigestDirectoriesPutResponse,
-		})
-		if !bytes.Equal(rootDigestPathInfo, rootDigestDirectoriesPutResponse) {
-			log.Errorf("returned root digest doesn't match what's calculated")
-			return nil, status.Error(codes.Internal, "error in root digest calculation")
-		}
-	}
-
 	// Compare NAR hash in the NARInfo with the one we calculated while reading the NAR
 	// We already checked above that the digest is in sha256.
 	importedNarSha256 := pathInfo.GetNarinfo().GetNarSha256()