[PATCH v7 10/33] refs: add do_for_each_per_worktree_ref

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Alternate refs backends might still use files to store per-worktree
refs.  So the files backend's ref-loading infrastructure should be
available to those backends, just for use on per-worktree refs.  Add
do_for_each_per_worktree_ref, which iterates over per-worktree refs.

Signed-off-by: David Turner <dturner@xxxxxxxxxxxxxxxx>
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
 refs/files-backend.c | 16 ++++++++++++++++
 refs/refs-internal.h |  7 +++++++
 2 files changed, 23 insertions(+)

diff --git a/refs/files-backend.c b/refs/files-backend.c
index f3d857a..31f38d0 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -560,6 +560,10 @@ static int do_one_ref(struct ref_entry *entry, void *cb_data)
 	struct ref_entry *old_current_ref;
 	int retval;
 
+	if (data->flags & DO_FOR_EACH_PER_WORKTREE_ONLY &&
+	    ref_type(entry->name) != REF_TYPE_PER_WORKTREE)
+		return 0;
+
 	if (!starts_with(entry->name, data->base))
 		return 0;
 
@@ -1693,6 +1697,18 @@ static int files_do_for_each_ref(const char *submodule, const char *base,
 	return do_for_each_entry(refs, base, do_one_ref, &data);
 }
 
+int do_for_each_per_worktree_ref(const char *submodule, const char *base,
+				 each_ref_fn fn, int trim, int flags,
+				 void *cb_data)
+{
+	/*
+	 * It's important that this one use the files backend, since
+	 *  that's what controls the per-worktree refs
+	 */
+	return files_do_for_each_ref(submodule, base, fn, trim,
+				     flags | DO_FOR_EACH_PER_WORKTREE_ONLY, cb_data);
+}
+
 static void unlock_ref(struct ref_lock *lock)
 {
 	/* Do not free lock->lk -- atexit() still looks at them */
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 3702737..bb0d588 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -203,6 +203,13 @@ int rename_ref_available(const char *oldname, const char *newname);
 /* Include broken references in a do_for_each_ref*() iteration: */
 #define DO_FOR_EACH_INCLUDE_BROKEN 0x01
 
+/* Only include per-worktree refs in a do_for_each_ref*() iteration */
+#define DO_FOR_EACH_PER_WORKTREE_ONLY 0x02
+
+int do_for_each_per_worktree_ref(const char *submodule, const char *base,
+				 each_ref_fn fn, int trim, int flags,
+				 void *cb_data);
+
 /* refs backends */
 typedef int ref_transaction_commit_fn(struct ref_transaction *transaction,
 				      struct strbuf *err);
-- 
2.4.2.767.g62658d5-twtrsrc

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