radicle: Allow all references to be included in sigrefs

Previously, the `references_of` implementation restricted the set of
references to certain categories: heads, tags, notes, rad, and cobs.

This is too restrictive to allow peers to share any references they
want. The only exceptions is references `refs/tmp/heads` that are
created for creating patches.

CHANGELOG.md

@@ -11,6 +11,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## New Features
 
+- The set of references returned by `references_of` were restricted to `heads`,
+  `tags`, `notes`, `rad`, and `cobs`. The restriction is lifted, and the only
+  references filtered out are `refs/tmp/heads` – used by `radicle-remote-helper`
+  to create temporary patches.
+
 ## Fixed Bugs
 
 ## Deprecations

crates/radicle/src/storage/git.rs

@@ -739,6 +739,17 @@ impl ReadRepository for Repository {
             .graph_descendant_of(head.into(), ancestor.into())
     }
 
+    /// The published references of the given `remote`.
+    ///
+    /// Note that this includes all references, including `refs/rad/sigrefs`.
+    /// This reference must be removed before signing the payload.
+    ///
+    /// # Skipped References
+    ///
+    /// References created by [`staging::patch`], i.e. references that begin
+    /// with `refs/tmp/heads`, are skipped.
+    ///
+    /// [`staging::patch`]: crate::git::refs::storage::staging::patch
     fn references_of(&self, remote: &RemoteId) -> Result<Refs, Error> {
         let entries = self
             .backend
@@ -750,22 +761,15 @@ impl ReadRepository for Repository {
             let name = e.name().ok_or(Error::InvalidRef)?;
             let (_, refname) = git::parse_ref::<RemoteId>(name)?;
             let oid = e.resolve()?.target().ok_or(Error::InvalidRef)?;
-            let (_, category, _, _) = refname.non_empty_components();
+            let (_, category, subcategory, _) = refname.non_empty_components();
 
-            use git::fmt::{component, name};
-
-            if [
-                name::HEADS,
-                name::TAGS,
-                name::NOTES,
-                &component!("rad"),
-                &component!("cobs"),
-            ]
-            .contains(&category.as_ref())
-            {
+            match (category.as_str(), subcategory.as_str()) {
+                ("tmp", "heads") => continue,
+                _ => {
                     refs.insert(refname.into(), oid.into());
                 }
             }
+        }
         Ok(refs.into())
     }