radicle: Remove ReadRepository::identity_root_of

This function is unused.

crates/radicle/src/storage.rs

@@ -545,9 +545,6 @@ pub trait ReadRepository: Sized + ValidateRepository {
     /// Get the root commit of the canonical identity branch.
     fn identity_root(&self) -> Result<Oid, RepositoryError>;
 
-    /// Get the root commit of the identity branch of a specific remote.
-    fn identity_root_of(&self, remote: &RemoteId) -> Result<Oid, RepositoryError>;
-
     /// Load the identity history.
     fn identity(&self) -> Result<Identity, RepositoryError>
     where

crates/radicle/src/storage/git.rs

@@ -891,21 +891,6 @@ impl ReadRepository for Repository {
         Ok(root.into())
     }
 
-    fn identity_root_of(&self, remote: &RemoteId) -> Result<Oid, RepositoryError> {
-        // Remotes that run newer clients will have this reference set. For older clients,
-        // compute the root OID based on the identity head.
-        if let Ok(root) = self.reference_oid(remote, &git::refs::storage::IDENTITY_ROOT) {
-            return Ok(root);
-        }
-        let oid = self.identity_head_of(remote)?;
-        let root = self
-            .revwalk(oid)?
-            .last()
-            .ok_or(RepositoryError::Doc(DocError::Missing))??;
-
-        Ok(root.into())
-    }
-
     fn canonical_identity_head(&self) -> Result<Oid, RepositoryError> {
         let blob = match self.backend.find_blob(self.id.deref().into()) {
             Ok(blob) => blob,

crates/radicle/src/storage/git/cob.rs

@@ -365,10 +365,6 @@ impl<R: storage::ReadRepository> ReadRepository for DraftStore<'_, R> {
         self.repo.identity_root()
     }
 
-    fn identity_root_of(&self, remote: &RemoteId) -> Result<Oid, RepositoryError> {
-        self.repo.identity_root_of(remote)
-    }
-
     fn canonical_identity_head(&self) -> Result<Oid, RepositoryError> {
         self.repo.canonical_identity_head()
     }

crates/radicle/src/test/storage.rs

@@ -327,10 +327,6 @@ impl ReadRepository for MockRepository {
         Ok(self.doc.commit)
     }
 
-    fn identity_root_of(&self, _remote: &RemoteId) -> Result<Oid, RepositoryError> {
-        Ok(self.doc.commit)
-    }
-
     fn canonical_identity_head(&self) -> Result<Oid, RepositoryError> {
         Ok(self.doc.commit)
     }