refactor(tvix/store): implement rename for node::Node r/6546

This returns a node with a new name.

Change-Id: Iebcab537f8dd63d826b9841d4d0181fcb941afdd
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9211
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

2 files changed, 13 insertions, 16 deletions

diff --git a/tvix/store/src/proto/mod.rs b/tvix/store/src/proto/mod.rs
index 9ee98d8c1c51..c502befe7db1 100644
--- a/tvix/store/src/proto/mod.rs
+++ b/tvix/store/src/proto/mod.rs
@@ -203,6 +203,17 @@ impl NamedNode for node::Node {
     }
 }
 
+impl node::Node {
+    /// Returns the node with a new name.
+    pub fn rename(self, name: bytes::Bytes) -> Self {
+        match self {
+            node::Node::Directory(n) => node::Node::Directory(DirectoryNode { name, ..n }),
+            node::Node::File(n) => node::Node::File(FileNode { name, ..n }),
+            node::Node::Symlink(n) => node::Node::Symlink(SymlinkNode { name, ..n }),
+        }
+    }
+}
+
 /// Accepts a name, and a mutable reference to the previous name.
 /// If the passed name is larger than the previous one, the reference is updated.
 /// If it's not, an error is returned.
diff --git a/tvix/store/src/store_io.rs b/tvix/store/src/store_io.rs
index 615d1f50f4a3..024d90576f06 100644
--- a/tvix/store/src/store_io.rs
+++ b/tvix/store/src/store_io.rs
@@ -131,26 +131,12 @@ impl TvixStoreIO {
             build_regular_ca_path(name, &nar_hash_with_mode, Vec::<String>::new(), false).unwrap();
 
         // assemble a new root_node with a name that is derived from the nar hash.
-        let renamed_root_node = {
-            let name = output_path.to_string().into_bytes().into();
-
-            match root_node {
-                crate::proto::node::Node::Directory(n) => {
-                    crate::proto::node::Node::Directory(crate::proto::DirectoryNode { name, ..n })
-                }
-                crate::proto::node::Node::File(n) => {
-                    crate::proto::node::Node::File(crate::proto::FileNode { name, ..n })
-                }
-                crate::proto::node::Node::Symlink(n) => {
-                    crate::proto::node::Node::Symlink(crate::proto::SymlinkNode { name, ..n })
-                }
-            }
-        };
+        let root_node = root_node.rename(output_path.to_string().into_bytes().into());
 
         // assemble the [crate::proto::PathInfo] object.
         let path_info = crate::proto::PathInfo {
             node: Some(crate::proto::Node {
-                node: Some(renamed_root_node),
+                node: Some(root_node),
             }),
             // There's no reference scanning on path contents ingested like this.
             references: vec![],