feat(tvix/nix-compat): add a basic listing deserializer r/8539

.ls files are useful to seek in a NAR without parsing it entirely.

The responsibility of validating the files is on the caller.

Change-Id: I5d1da28b5479c38f20ca5babe60e362a2217c9ea
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12196
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/tvix/nix-compat/src/nar/listing/test.rs b/tvix/nix-compat/src/nar/listing/test.rs
new file mode 100644
index 000000000000..088a6133f531
--- /dev/null
+++ b/tvix/nix-compat/src/nar/listing/test.rs
@@ -0,0 +1,10 @@
+use crate::nar;
+
+#[test]
+fn nixos_release() {
+    let listing_bytes = include_bytes!("../tests/nixos-release.ls");
+    let listing: nar::listing::Listing = serde_json::from_slice(listing_bytes).unwrap();
+
+    let nar::listing::Listing::V1 { root, .. } = listing;
+    assert!(matches!(root, nar::listing::ListingEntry::Directory { .. }));
+}