refs: retrieve worktree ref stores via associated repository

Similar as with the preceding commit, the worktree ref stores are always
looked up via `the_repository`. Also, again, those ref stores are stored
in a global map.

Refactor the code so that worktrees have a pointer to their repository.
Like this, we can move the global map into `struct repository` and stop
using `the_repository`. With this change, we can now in theory look up
worktree ref stores for repositories other than `the_repository`. In
practice, the worktree code will need further changes to look up
arbitrary worktrees.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/repository.h b/repository.h
index 0389df0461..4bd8969005 100644
--- a/repository.h
+++ b/repository.h
@@ -117,6 +117,12 @@ struct repository {
 	struct strmap submodule_ref_stores;
 
 	/*
+	 * A strmap of ref_stores, stored by worktree id, accessible via
+	 * `get_worktree_ref_store()`.
+	 */
+	struct strmap worktree_ref_stores;
+
+	/*
 	 * Contains path to often used file names.
 	 */
 	struct repo_path_cache cached_paths;