[PATCH 04/10] submodule init: support multiple worktrees

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

The entire submodule section in the superproject will be per-worktree
and written to $GIT_DIR/config.worktree.

The behavior when you only have one worktree (and not enabled
extensions.worktreeConfig) is the same as before, everything is still
written in $GIT_DIR/config

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/submodule--helper.c    | 14 +++++---------
 t/t2405-worktree-submodules.sh | 28 ++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 9 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 7b328ec060..6b749b41fb 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -639,15 +639,11 @@ static void init_submodule(const char *path, const char *prefix,
 		die(_("No url found for submodule path '%s' in .gitmodules"),
 			displaypath);
 
-	/*
-	 * NEEDSWORK: In a multi-working-tree world, this needs to be
-	 * set in the per-worktree config.
-	 *
-	 * Set active flag for the submodule being initialized
-	 */
+	check_multi_worktree_support();
+
 	if (!is_submodule_active(the_repository, path)) {
 		strbuf_addf(&sb, "submodule.%s.active", sub->name);
-		git_config_set_gently(sb.buf, "true");
+		repo_config_set_worktree_gently(the_repository, sb.buf, "true");
 		strbuf_reset(&sb);
 	}
 
@@ -672,7 +668,7 @@ static void init_submodule(const char *path, const char *prefix,
 			free(oldurl);
 		}
 
-		if (git_config_set_gently(sb.buf, url))
+		if (repo_config_set_worktree_gently(the_repository, sb.buf, url))
 			die(_("Failed to register url for submodule path '%s'"),
 			    displaypath);
 		if (!(flags & OPT_QUIET))
@@ -693,7 +689,7 @@ static void init_submodule(const char *path, const char *prefix,
 		} else
 			upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 
-		if (git_config_set_gently(sb.buf, upd))
+		if (repo_config_set_worktree_gently(the_repository, sb.buf, upd))
 			die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 	}
 	strbuf_release(&sb);
diff --git a/t/t2405-worktree-submodules.sh b/t/t2405-worktree-submodules.sh
index 3ee5380e88..2ee3e2d039 100755
--- a/t/t2405-worktree-submodules.sh
+++ b/t/t2405-worktree-submodules.sh
@@ -39,4 +39,32 @@ test_expect_success 'add submodules' '
 	test -d .git/worktrees/secondary/modules/sub2
 '
 
+test_expect_success 'init submodules' '
+	git clone --no-local .git cloned &&
+	(
+		cd cloned &&
+		git config extensions.worktreeConfig true &&
+		git submodule init sub1 &&
+		git worktree add secondary origin/secondary &&
+		cd secondary &&
+		git submodule init sub2
+	) &&
+
+	git -C cloned config --get-regexp "submodule.*" | sort >actual1 &&
+	cat >expected1 <<-EOF &&
+	submodule.sub1.active true
+	submodule.sub1.url $(pwd)/submodsrc
+	EOF
+	test_cmp expected1 actual1 &&
+	! test -d cloned/.git/modules/sub1 &&
+
+	git -C cloned/secondary config --get-regexp "submodule.*" | sort >actual2 &&
+	cat >expected2 <<-EOF &&
+	submodule.sub2.active true
+	submodule.sub2.url $(pwd)/submodsrc
+	EOF
+	test_cmp expected2 actual2 &&
+	! test -d cloned/.git/worktrees/secondary/modules/sub2
+'
+
 test_done
-- 
2.20.0.482.g66447595a7