[PATCH 08/10] submodule.c: do not copy around submodule list

From: Stefan Beller <sbeller@google.com>
Date: Aug 8, 2018, 22:17 UTC
Message-ID: <20180808221752.195419-9-sbeller@google.com>
In-Reply-To: <20180808221752.195419-1-sbeller@google.com>

'calculate_changed_submodule_paths' uses a local list to compute the changed submodules, and then produces the result by copying appropriate items into the result list.

Instead use the result list directly and prune items afterwards using string_list_remove_empty_items.

As a side effect, we'll have access to the util pointer for longer that contains the commits that we need to fetch.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 submodule.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/submodule.c b/submodule.c
index 92988239f6b..21757e32908 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1128,8 +1128,7 @@ static void calculate_changed_submodule_paths(
 	struct submodule_parallel_fetch *spf)
 {
 	struct argv_array argv = ARGV_ARRAY_INIT;
-	struct string_list changed_submodules = STRING_LIST_INIT_DUP;
-	const struct string_list_item *name;
+	struct string_list_item *name;
 
 	/* No need to check if there are no submodules configured */
 	if (!submodule_from_path(the_repository, NULL, NULL))
@@ -1146,9 +1145,9 @@ static void calculate_changed_submodule_paths(
 	 * Collect all submodules (whether checked out or not) for which new
 	 * commits have been recorded upstream in "changed_submodule_names".
 	 */
-	collect_changed_submodules(&changed_submodules, &argv);
+	collect_changed_submodules(&spf->changed_submodule_names, &argv);
 
-	for_each_string_list_item(name, &changed_submodules) {
+	for_each_string_list_item(name, &spf->changed_submodule_names) {
 		struct oid_array *commits = name->util;
 		const struct submodule *submodule;
 		const char *path = NULL;
@@ -1162,12 +1161,14 @@ static void calculate_changed_submodule_paths(
 		if (!path)
 			continue;
 
-		if (!submodule_has_commits(path, commits))
-			string_list_append(&spf->changed_submodule_names,
-					   name->string);
+		if (submodule_has_commits(path, commits)) {
+			oid_array_clear(commits);
+			*name->string = '\0';
+		}
 	}
 
-	free_submodules_oids(&changed_submodules);
+	string_list_remove_empty_items(&spf->changed_submodule_names, 1);
+
 	argv_array_clear(&argv);
 	oid_array_clear(&ref_tips_before_fetch);
 	oid_array_clear(&ref_tips_after_fetch);
@@ -1362,7 +1363,7 @@ int fetch_populated_submodules(struct repository *r,
 
 	argv_array_clear(&spf.args);
 out:
-	string_list_clear(&spf.changed_submodule_names, 1);
+	free_submodules_oids(&spf.changed_submodule_names);
 	return spf.result;
 }

-- 
2.18.0.597.ga71716f1ad-goog