Subject: [PATCH 23/30] tree-walk.h API: add a get_tree_entry_path() function

From: Ævar Arnfjörð Bjarmason <[email-masked]>
Date: Mon, 8 Mar 2021 16:06:43 +0100

Add a get_tree_entry_path() variant in addition to
get_tree_entry_path_{mode,type,all}(). This is for those callers that
need neither the mode nor "enum object_type" parameters filled for
them.

There's callers here which doesn't need the "struct object_id" filled
either, and provides a throwaway variable for us.

See the following commits for the introduction of such code that's
being modified here:

 - shift_tree(): 68faf68938e (A new merge stragety 'subtree'.,
    2007-02-15) for the shift_tree()

 - tree_has_path(): 96e7ffbdc31 (merge-recursive: check for directory
   level conflicts, 2018-04-19)

 - init_notes(): fd53c9eb445 (Speed up git notes lookup, 2009-10-09)

 - diagnose_invalid_oid_path(): 009fee4774d (Detailed diagnosis when
   parsing an object name fails., 2009-12-07)

Those could potentially be refactored too, but I've got to stop at
some point, and right now I'm focusing downstream code that depends on
"mode" (or "enum object_type").

Signed-off-by: Ævar Arnfjörð Bjarmason <[email-masked]>
---
 match-trees.c     |  4 +---
 merge-recursive.c |  6 ++----
 notes.c           |  3 +--
 object-name.c     |  3 +--
 tree-walk.c       | 11 +++++++++++
 tree-walk.h       |  3 +++
 6 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/match-trees.c b/match-trees.c
index ce3f811ec04..60a17b92d70 100644
--- a/match-trees.c
+++ b/match-trees.c
@@ -288,12 +288,10 @@ void shift_tree(struct repository *r,
 
 	if (add_score < del_score) {
 		/* We need to pick a subtree of two */
-		unsigned short mode;
-
 		if (!*del_prefix)
 			return;
 
-		if (get_tree_entry_mode(r, hash2, del_prefix, shifted, &mode))
+		if (get_tree_entry_path(r, hash2, del_prefix, shifted))
 			die("cannot find path %s in tree %s",
 			    del_prefix, oid_to_hex(hash2));
 		return;
diff --git a/merge-recursive.c b/merge-recursive.c
index 0e891360e7e..b26d9d418f9 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1884,11 +1884,9 @@ static int tree_has_path(struct repository *r, struct tree *tree,
 			 const char *path)
 {
 	struct object_id hashy;
-	unsigned short mode_o;
-
-	return !get_tree_entry_mode(r,
+	return !get_tree_entry_path(r,
 				    &tree->object.oid, path,
-				    &hashy, &mode_o);
+				    &hashy);
 }
 
 /*
diff --git a/notes.c b/notes.c
index ef138606146..aa46cb2b09e 100644
--- a/notes.c
+++ b/notes.c
@@ -994,7 +994,6 @@ void init_notes(struct notes_tree *t, const char *notes_ref,
 		combine_notes_fn combine_notes, int flags)
 {
 	struct object_id oid, object_oid;
-	unsigned short mode;
 	struct leaf_node root_tree;
 
 	if (!t)
@@ -1021,7 +1020,7 @@ void init_notes(struct notes_tree *t, const char *notes_ref,
 		return;
 	if (flags & NOTES_INIT_WRITABLE && read_ref(notes_ref, &object_oid))
 		die("Cannot use notes ref %s", notes_ref);
-	if (get_tree_entry_mode(the_repository, &object_oid, "", &oid, &mode))
+	if (get_tree_entry_path(the_repository, &object_oid, "", &oid))
 		die("Failed to read notes tree referenced by %s (%s)",
 		    notes_ref, oid_to_hex(&object_oid));
 
diff --git a/object-name.c b/object-name.c
index 7e3b2d6d739..9ff5f83c1ff 100644
--- a/object-name.c
+++ b/object-name.c
@@ -1693,7 +1693,6 @@ static void diagnose_invalid_oid_path(struct repository *r,
 				      int object_name_len)
 {
 	struct object_id oid;
-	unsigned short mode;
 
 	if (!prefix)
 		prefix = "";
@@ -1704,7 +1703,7 @@ static void diagnose_invalid_oid_path(struct repository *r,
 	if (is_missing_file_error(errno)) {
 		char *fullname = xstrfmt("%s%s", prefix, filename);
 
-		if (!get_tree_entry_mode(r, tree_oid, fullname, &oid, &mode)) {
+		if (!get_tree_entry_path(r, tree_oid, fullname, &oid)) {
 			die(_("path '%s' exists, but not '%s'\n"
 			    "hint: Did you mean '%.*s:%s' aka '%.*s:./%s'?"),
 			    fullname,
diff --git a/tree-walk.c b/tree-walk.c
index 0ad3d80593e..83737634770 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -632,6 +632,17 @@ int get_tree_entry_all(struct repository *r,
 	return retval;
 }
 
+int get_tree_entry_path(struct repository *r,
+			const struct object_id *tree_oid,
+			const char *name,
+			struct object_id *oid)
+{
+	unsigned short mode;
+	enum object_type object_type;
+	return get_tree_entry_all(r, tree_oid, name, oid,
+				  &mode, &object_type);
+}
+
 int get_tree_entry_mode(struct repository *r,
 			const struct object_id *tree_oid,
 			const char *name,
diff --git a/tree-walk.h b/tree-walk.h
index 5db38fcb575..1bfa839b275 100644
--- a/tree-walk.h
+++ b/tree-walk.h
@@ -175,10 +175,13 @@ struct traverse_info {
  * "struct name_entry" you'd like. You always need to pointer to an
  * appropriate variable to fill in (NULL won't do!):
  *
+ * get_tree_entry_path(): <no extra argument, just get the common 'path'>
  * get_tree_entry_mode(): unsigned int mode
  * get_tree_entry_type(): enum object_type
  * get_tree_entry_all(): unsigned int mode, enum object_type
  */
+int get_tree_entry_path(struct repository *, const struct object_id *, const char *,
+			struct object_id *);
 int get_tree_entry_mode(struct repository *, const struct object_id *, const char *,
 			struct object_id *,
 			unsigned short *);
-- 
2.31.0.rc0.126.g04f22c5b82