Merge branch 'sb/checkout-recurse-submodules' into maint

"git checkout --recurse-submodules" did not quite work with a
submodule that itself has submodules.

* sb/checkout-recurse-submodules:
  submodule: properly recurse for read-tree and checkout
  submodule: avoid auto-discovery in new working tree manipulator code
  submodule_move_head: reuse child_process structure for futher commands

submodule.c

@@ -1363,7 +1363,7 @@ static int submodule_has_dirty_index(const struct submodule *sub)
 {
 	struct child_process cp = CHILD_PROCESS_INIT;
 
-	prepare_submodule_repo_env_no_git_dir(&cp.env_array);
+	prepare_submodule_repo_env(&cp.env_array);
 
 	cp.git_cmd = 1;
 	argv_array_pushl(&cp.args, "diff-index", "--quiet",
@@ -1380,7 +1380,7 @@ static int submodule_has_dirty_index(const struct submodule *sub)
 static void submodule_reset_index(const char *path)
 {
 	struct child_process cp = CHILD_PROCESS_INIT;
-	prepare_submodule_repo_env_no_git_dir(&cp.env_array);
+	prepare_submodule_repo_env(&cp.env_array);
 
 	cp.git_cmd = 1;
 	cp.no_stdin = 1;
@@ -1438,7 +1438,7 @@ int submodule_move_head(const char *path,
 		}
 	}
 
-	prepare_submodule_repo_env_no_git_dir(&cp.env_array);
+	prepare_submodule_repo_env(&cp.env_array);
 
 	cp.git_cmd = 1;
 	cp.no_stdin = 1;
@@ -1446,7 +1446,7 @@ int submodule_move_head(const char *path,
 
 	argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
 			get_super_prefix_or_empty(), path);
-	argv_array_pushl(&cp.args, "read-tree", NULL);
+	argv_array_pushl(&cp.args, "read-tree", "--recurse-submodules", NULL);
 
 	if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
 		argv_array_push(&cp.args, "-n");
@@ -1468,15 +1468,16 @@ int submodule_move_head(const char *path,
 
 	if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
 		if (new) {
-			struct child_process cp1 = CHILD_PROCESS_INIT;
+			child_process_init(&cp);
 			/* also set the HEAD accordingly */
-			cp1.git_cmd = 1;
-			cp1.no_stdin = 1;
-			cp1.dir = path;
+			cp.git_cmd = 1;
+			cp.no_stdin = 1;
+			cp.dir = path;
 
-			argv_array_pushl(&cp1.args, "update-ref", "HEAD", new, NULL);
+			prepare_submodule_repo_env(&cp.env_array);
+			argv_array_pushl(&cp.args, "update-ref", "HEAD", new, NULL);
 
-			if (run_command(&cp1)) {
+			if (run_command(&cp)) {
 				ret = -1;
 				goto out;
 			}

t/lib-submodule-update.sh

@@ -787,11 +787,6 @@ test_submodule_switch_recursing () {
 	then
 		RESULTDS=failure
 	fi
-	RESULTR=success
-	if test "$KNOWN_FAILURE_SUBMODULE_RECURSIVE_NESTED" = 1
-	then
-		RESULTR=failure
-	fi
 	RESULTOI=success
 	if test "$KNOWN_FAILURE_SUBMODULE_OVERWRITE_IGNORED_UNTRACKED" = 1
 	then
@@ -1003,7 +998,7 @@ test_submodule_switch_recursing () {
 	'
 
 	# recursing deeper than one level doesn't work yet.
-	test_expect_$RESULTR "$command: modified submodule updates submodule recursively" '
+	test_expect_success "$command: modified submodule updates submodule recursively" '
 		prolog &&
 		reset_work_tree_to_interested add_nested_sub &&
 		(

t/t1013-read-tree-submodule.sh

@@ -5,7 +5,6 @@ test_description='read-tree can handle submodules'
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-submodule-update.sh
 
-KNOWN_FAILURE_SUBMODULE_RECURSIVE_NESTED=1
 KNOWN_FAILURE_DIRECTORY_SUBMODULE_CONFLICTS=1
 KNOWN_FAILURE_SUBMODULE_OVERWRITE_IGNORED_UNTRACKED=1
 

t/t2013-checkout-submodule.sh

@@ -64,7 +64,6 @@ test_expect_success '"checkout <submodule>" honors submodule.*.ignore from .git/
 '
 
 KNOWN_FAILURE_DIRECTORY_SUBMODULE_CONFLICTS=1
-KNOWN_FAILURE_SUBMODULE_RECURSIVE_NESTED=1
 test_submodule_switch_recursing "git checkout --recurse-submodules"
 
 test_submodule_forced_switch_recursing "git checkout -f --recurse-submodules"