fix: make Repository::kind() detect linked worktrees of bare repos

gix/src/repository/location.rs

@@ -127,9 +127,10 @@ impl crate::Repository {
     pub fn kind(&self) -> crate::repository::Kind {
         use gix_discover::path::RepositoryKind::*;
         match gix_discover::path::repository_kind(self.git_dir()) {
-            None | Some(Common) => crate::repository::Kind::Common,
             Some(Submodule) => crate::repository::Kind::Submodule,
             Some(LinkedWorktree) => crate::repository::Kind::LinkedWorkTree,
+            None | Some(Common) if self.git_dir() != self.common_dir() => crate::repository::Kind::LinkedWorkTree,
+            None | Some(Common) => crate::repository::Kind::Common,
         }
     }
 

gix/tests/fixtures/make_worktree_repo.sh

@@ -64,3 +64,8 @@ git init non-bare-turned-bare
 
   git worktree add ../worktree-of-bare-repo
 )
+
+git clone --bare --shared repo natively-bare-repo
+(cd natively-bare-repo
+  git worktree add ../worktree-of-natively-bare-repo
+)

gix/tests/gix/repository/open.rs

@@ -190,6 +190,51 @@ fn worktree_of_bare_repo() -> crate::Result {
     Ok(())
 }
 
+#[test]
+fn worktree_of_natively_bare_repo() -> crate::Result {
+    let repo = named_subrepo_opts(
+        "make_worktree_repo.sh",
+        "worktree-of-natively-bare-repo",
+        gix::open::Options::isolated(),
+    )?;
+    assert_ne!(
+        repo.workdir(),
+        None,
+        "we have opened the repo through a worktree, which is never bare"
+    );
+    assert!(
+        !repo
+            .worktree()
+            .expect("the worktree is available, it's linked")
+            .is_main(),
+        "linked worktrees can exist for any repository, even bare"
+    );
+    assert!(
+        repo.is_bare(),
+        "the shared config has core.bare=true, which a linked worktree inherits even though it has a workdir"
+    );
+    assert_eq!(repo.kind(), gix::repository::Kind::LinkedWorkTree);
+    Ok(())
+}
+
+#[test]
+fn natively_bare_repo_itself_is_common() -> crate::Result {
+    let repo = named_subrepo_opts(
+        "make_worktree_repo.sh",
+        "natively-bare-repo",
+        gix::open::Options::isolated(),
+    )?;
+    assert!(repo.is_bare());
+    assert_eq!(repo.workdir(), None, "the bare repository itself has no worktree");
+    assert_eq!(
+        repo.git_dir(),
+        repo.common_dir(),
+        "there is no linked-worktree redirection"
+    );
+    assert_eq!(repo.kind(), gix::repository::Kind::Common);
+    Ok(())
+}
+
 #[test]
 fn non_bare_non_git_repo_without_worktree() -> crate::Result {
     let repo = named_subrepo_opts(