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[3/5] submodule--helper: use correct display path helper

Message ID 7cd1c46f350bf26216814dcf9dd4b8002a91467a.1656372017.git.gitgitgadget@gmail.com (mailing list archive)
State Superseded
Headers show
Series submodule: remove "--recursive-prefix" | expand

Commit Message

Glen Choo June 27, 2022, 11:20 p.m. UTC 
From: Glen Choo <chooglen@google.com>

Replace a chunk of code in update_submodule() with an equivalent
do_get_submodule_displaypath() invocation. This is already tested by
t/t7406-submodule-update.sh:'submodule update --init --recursive from
subdirectory', so no tests are added.

The two are equivalent because:

- Exactly one of recursive_prefix|prefix is non-NULL at a time; prefix
  is set at the superproject level, and recursive_prefix is set when
  recursing into submodules. There is also a BUG() statement in
  get_submodule_displaypath() that asserts that both cannot be non-NULL.

- In get_submodule_displaypath(), get_super_prefix() always returns NULL
  because "--super-prefix" is never passed. Thus calling it is
  equivalent to calling do_get_submodule_displaypath() with super_prefix
  = NULL.

Therefore:

- When recursive_prefix is non-NULL, prefix is NULL, and thus
  get_submodule_displaypath() just returns prefixed_path. This is
  identical to calling do_get_submodule_displaypath() with super_prefix
  = recursive_prefix because the return value is still the concatenation
  of recursive_prefix + update_data->sm_path.

- When prefix is non-NULL, prefixed_path = update_data->sm_path. Thus
  calling get_submodule_displaypath() with prefixed_path is equivalent
  to calling do_get_submodule_displaypath() with update_data->sm_path

Signed-off-by: Glen Choo <chooglen@google.com>
---
 builtin/submodule--helper.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)
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Patch

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 7a963a967b8..fa8256526e9 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -2445,19 +2445,11 @@  static void update_data_to_args(struct update_data *update_data, struct strvec *
 
 static int update_submodule(struct update_data *update_data)
 {
-	char *prefixed_path;
-
 	ensure_core_worktree(update_data->sm_path);
 
-	if (update_data->recursive_prefix)
-		prefixed_path = xstrfmt("%s%s", update_data->recursive_prefix,
-					update_data->sm_path);
-	else
-		prefixed_path = xstrdup(update_data->sm_path);
-
-	update_data->displaypath = get_submodule_displaypath(prefixed_path,
-							     update_data->prefix);
-	free(prefixed_path);
+	update_data->displaypath = do_get_submodule_displaypath(update_data->sm_path,
+								update_data->prefix,
+								update_data->recursive_prefix);
 
 	determine_submodule_update_strategy(the_repository, update_data->just_cloned,
 					    update_data->sm_path, update_data->update_default,