serialize collection of refs that contain submodule changes

We are iterating over each pushed ref and want to check whether it
contains changes to submodules. Instead of immediately checking each ref
lets first collect them and then do the check for all of them in one
revision walk.

Signed-off-by: Heiko Voigt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: hvoigt

submodule.c

@@ -507,33 +507,39 @@ static void free_submodules_sha1s(struct string_list *submodules)
 	string_list_clear(submodules, 1);
 }
 
-int find_unpushed_submodules(unsigned char new_sha1[20],
+static void append_hash_to_argv(const unsigned char sha1[20],
+		void *data)
+{
+	struct argv_array *argv = (struct argv_array *) data;
+	argv_array_push(argv, sha1_to_hex(sha1));
+}
+
+int find_unpushed_submodules(struct sha1_array *hashes,
 		const char *remotes_name, struct string_list *needs_pushing)
 {
 	struct rev_info rev;
 	struct commit *commit;
-	const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
-	int argc = ARRAY_SIZE(argv) - 1, i;
-	char *sha1_copy;
+	int i;
 	struct string_list submodules = STRING_LIST_INIT_DUP;
+	struct argv_array argv = ARGV_ARRAY_INIT;
 
-	struct strbuf remotes_arg = STRBUF_INIT;
-
-	strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
 	init_revisions(&rev, NULL);
-	sha1_copy = xstrdup(sha1_to_hex(new_sha1));
-	argv[1] = sha1_copy;
-	argv[3] = remotes_arg.buf;
-	setup_revisions(argc, argv, &rev, NULL);
+
+	/* argv.argv[0] will be ignored by setup_revisions */
+	argv_array_push(&argv, "find_unpushed_submodules");
+	sha1_array_for_each_unique(hashes, append_hash_to_argv, &argv);
+	argv_array_push(&argv, "--not");
+	argv_array_pushf(&argv, "--remotes=%s", remotes_name);
+
+	setup_revisions(argv.argc, argv.argv, &rev, NULL);
 	if (prepare_revision_walk(&rev))
 		die("revision walk setup failed");
 
 	while ((commit = get_revision(&rev)) != NULL)
 		find_unpushed_submodule_commits(commit, &submodules);
 
 	reset_revision_walk();
-	free(sha1_copy);
-	strbuf_release(&remotes_arg);
+	argv_array_clear(&argv);
 
 	for (i = 0; i < submodules.nr; i++) {
 		struct string_list_item *item = &submodules.items[i];
@@ -571,12 +577,12 @@ static int push_submodule(const char *path)
 	return 1;
 }
 
-int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
+int push_unpushed_submodules(struct sha1_array *hashes, const char *remotes_name)
 {
 	int i, ret = 1;
 	struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 
-	if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
+	if (!find_unpushed_submodules(hashes, remotes_name, &needs_pushing))
 		return 1;
 
 	for (i = 0; i < needs_pushing.nr; i++) {

submodule.h

@@ -3,6 +3,7 @@
 
 struct diff_options;
 struct argv_array;
+struct sha1_array;
 
 enum {
 	RECURSE_SUBMODULES_CHECK = -4,
@@ -56,9 +57,9 @@ int submodule_uses_gitfile(const char *path);
 int ok_to_remove_submodule(const char *path);
 int merge_submodule(unsigned char result[20], const char *path, const unsigned char base[20],
 		    const unsigned char a[20], const unsigned char b[20], int search);
-int find_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name,
+int find_unpushed_submodules(struct sha1_array *hashes, const char *remotes_name,
 		struct string_list *needs_pushing);
-int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name);
+int push_unpushed_submodules(struct sha1_array *hashes, const char *remotes_name);
 void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir);
 int parallel_submodules(void);
 

transport.c

@@ -903,23 +903,29 @@ int transport_push(struct transport *transport,
 
 		if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
 			struct ref *ref = remote_refs;
+			struct sha1_array hashes = SHA1_ARRAY_INIT;
+
 			for (; ref; ref = ref->next)
-				if (!is_null_oid(&ref->new_oid) &&
-				    !push_unpushed_submodules(ref->new_oid.hash,
-					    transport->remote->name))
-				    die ("Failed to push all needed submodules!");
+				if (!is_null_oid(&ref->new_oid))
+					sha1_array_append(&hashes, ref->new_oid.hash);
+
+			if (!push_unpushed_submodules(&hashes, transport->remote->name))
+				die ("Failed to push all needed submodules!");
 		}
 
 		if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
 			      TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
 			struct ref *ref = remote_refs;
 			struct string_list needs_pushing = STRING_LIST_INIT_DUP;
+			struct sha1_array hashes = SHA1_ARRAY_INIT;
 
 			for (; ref; ref = ref->next)
-				if (!is_null_oid(&ref->new_oid) &&
-				    find_unpushed_submodules(ref->new_oid.hash,
-					    transport->remote->name, &needs_pushing))
-					die_with_unpushed_submodules(&needs_pushing);
+				if (!is_null_oid(&ref->new_oid))
+					sha1_array_append(&hashes, ref->new_oid.hash);
+
+			if (find_unpushed_submodules(&hashes, transport->remote->name,
+						&needs_pushing))
+				die_with_unpushed_submodules(&needs_pushing);
 		}
 
 		push_ret = transport->push_refs(transport, remote_refs, flags);