refactor(tvix/castore): drop {Directory,File,Symlink}Node r/8505

Add a `SymlinkTarget` type to represent validated symlink targets.
With this, no invalid states are representable, so we can make `Node` be
just an enum of all three kind of types, and allow access to these
fields directly.

Change-Id: I20bdd480c8d5e64a827649f303c97023b7e390f2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12216
Reviewed-by: benjaminedwardwebb <benjaminedwardwebb@gmail.com>
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Tested-by: BuildkiteCI

1 files changed, 0 insertions, 35 deletions

diff --git a/tvix/castore/src/nodes/directory_node.rs b/tvix/castore/src/nodes/directory_node.rs
deleted file mode 100644
index e6e6312a7a0c..000000000000
--- a/tvix/castore/src/nodes/directory_node.rs
+++ /dev/null
@@ -1,35 +0,0 @@
-use crate::B3Digest;
-
-/// A DirectoryNode is a pointer to a [Directory], by its [Directory::digest].
-/// It also records a`size`.
-/// Such a node is either an element in the [Directory] it itself is contained in,
-/// or a standalone root node./
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct DirectoryNode {
-    /// The blake3 hash of a Directory message, serialized in protobuf canonical form.
-    digest: B3Digest,
-    /// Number of child elements in the Directory referred to by `digest`.
-    /// Calculated by summing up the numbers of nodes, and for each directory.
-    /// its size field. Can be used for inode allocation.
-    /// This field is precisely as verifiable as any other Merkle tree edge.
-    /// Resolve `digest`, and you can compute it incrementally. Resolve the entire
-    /// tree, and you can fully compute it from scratch.
-    /// A credulous implementation won't reject an excessive size, but this is
-    /// harmless: you'll have some ordinals without nodes. Undersizing is obvious
-    /// and easy to reject: you won't have an ordinal for some nodes.
-    size: u64,
-}
-
-impl DirectoryNode {
-    pub fn new(digest: B3Digest, size: u64) -> Self {
-        Self { digest, size }
-    }
-
-    pub fn digest(&self) -> &B3Digest {
-        &self.digest
-    }
-
-    pub fn size(&self) -> u64 {
-        self.size
-    }
-}