1 files changed, 58 insertions, 0 deletions
diff --git a/tvix/store/protos/pathinfo.proto b/tvix/store/protos/pathinfo.proto
new file mode 100644
index 000000000000..aa98c6df9a2d
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+++ b/tvix/store/protos/pathinfo.proto
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2022 The Tvix Authors
+syntax = "proto3";
+
+package tvix.store.v1;
+
+import "tvix/castore/protos/castore.proto";
+
+option go_package = "code.tvl.fyi/tvix/store/protos;storev1";
+
+// PathInfo shows information about a Nix Store Path.
+// That's a single element inside /nix/store.
+message PathInfo {
+    // The path can be a directory, file or symlink.
+    tvix.castore.v1.Node node = 1;
+
+    // List of references (output path hashes)
+    // This really is the raw *bytes*, after decoding nixbase32, and not a
+    // base32-encoded string.
+    repeated bytes references = 2;
+
+    // see below.
+    NARInfo narinfo = 3;
+}
+
+// Nix C++ uses NAR (Nix Archive) as a format to transfer store paths,
+// and stores metadata and signatures in NARInfo files.
+// Store all these attributes in a separate message.
+//
+// This is useful to render .narinfo files to clients, or to preserve/validate
+// these signatures.
+// As verifying these signatures requires the whole NAR file to be synthesized,
+// moving to another signature scheme is desired.
+// Even then, it still makes sense to hold this data, for old clients.
+message NARInfo {
+    // This represents a (parsed) signature line in a .narinfo file.
+    message Signature {
+        string name = 1;
+        bytes data = 2;
+    };
+
+    // This size of the NAR file, in bytes.
+    uint64 nar_size = 1;
+
+    // The sha256 of the NAR file representation.
+    bytes nar_sha256 = 2;
+
+    // The signatures in a .narinfo file.
+    repeated Signature signatures = 3;
+
+    // A list of references. To validate .narinfo signatures, a fingerprint
+    // needs to be constructed.
+    // This fingerprint doesn't just contain the hashes of the output paths of
+    // all references (like PathInfo.references), but their whole (base)names,
+    // so we need to keep them somewhere.
+    repeated string reference_names = 4;
+
+}