1 files changed, 87 insertions, 5 deletions

diff --git a/submodule.c b/submodule.c
index 3b98766a6b..3200b7bb2b 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1403,7 +1403,7 @@ static void relocate_single_git_dir_into_superproject(const char *prefix,
 		/* If it is an actual gitfile, it doesn't need migration. */
 		return;
 
-	real_old_git_dir = real_pathdup(old_git_dir);
+	real_old_git_dir = real_pathdup(old_git_dir, 1);
 
 	sub = submodule_from_path(null_sha1, path);
 	if (!sub)
@@ -1412,7 +1412,7 @@ static void relocate_single_git_dir_into_superproject(const char *prefix,
 	new_git_dir = git_path("modules/%s", sub->name);
 	if (safe_create_leading_directories_const(new_git_dir) < 0)
 		die(_("could not create directory '%s'"), new_git_dir);
-	real_new_git_dir = real_pathdup(new_git_dir);
+	real_new_git_dir = real_pathdup(new_git_dir, 1);
 
 	if (!prefix)
 		prefix = get_super_prefix();
@@ -1472,14 +1472,14 @@ void absorb_git_dir_into_superproject(const char *prefix,
 		new_git_dir = git_path("modules/%s", sub->name);
 		if (safe_create_leading_directories_const(new_git_dir) < 0)
 			die(_("could not create directory '%s'"), new_git_dir);
-		real_new_git_dir = real_pathdup(new_git_dir);
+		real_new_git_dir = real_pathdup(new_git_dir, 1);
 		connect_work_tree_and_git_dir(path, real_new_git_dir);
 
 		free(real_new_git_dir);
 	} else {
 		/* Is it already absorbed into the superprojects git dir? */
-		char *real_sub_git_dir = real_pathdup(sub_git_dir);
-		char *real_common_git_dir = real_pathdup(get_git_common_dir());
+		char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
+		char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
 
 		if (!starts_with(real_sub_git_dir, real_common_git_dir))
 			relocate_single_git_dir_into_superproject(prefix, path);
@@ -1514,3 +1514,85 @@ void absorb_git_dir_into_superproject(const char *prefix,
 		strbuf_release(&sb);
 	}
 }
+
+const char *get_superproject_working_tree(void)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+	struct strbuf sb = STRBUF_INIT;
+	const char *one_up = real_path_if_valid("../");
+	const char *cwd = xgetcwd();
+	const char *ret = NULL;
+	const char *subpath;
+	int code;
+	ssize_t len;
+
+	if (!is_inside_work_tree())
+		/*
+		 * FIXME:
+		 * We might have a superproject, but it is harder
+		 * to determine.
+		 */
+		return NULL;
+
+	if (!one_up)
+		return NULL;
+
+	subpath = relative_path(cwd, one_up, &sb);
+
+	prepare_submodule_repo_env(&cp.env_array);
+	argv_array_pop(&cp.env_array);
+
+	argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
+			"ls-files", "-z", "--stage", "--full-name", "--",
+			subpath, NULL);
+	strbuf_reset(&sb);
+
+	cp.no_stdin = 1;
+	cp.no_stderr = 1;
+	cp.out = -1;
+	cp.git_cmd = 1;
+
+	if (start_command(&cp))
+		die(_("could not start ls-files in .."));
+
+	len = strbuf_read(&sb, cp.out, PATH_MAX);
+	close(cp.out);
+
+	if (starts_with(sb.buf, "160000")) {
+		int super_sub_len;
+		int cwd_len = strlen(cwd);
+		char *super_sub, *super_wt;
+
+		/*
+		 * There is a superproject having this repo as a submodule.
+		 * The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
+		 * We're only interested in the name after the tab.
+		 */
+		super_sub = strchr(sb.buf, '\t') + 1;
+		super_sub_len = sb.buf + sb.len - super_sub - 1;
+
+		if (super_sub_len > cwd_len ||
+		    strcmp(&cwd[cwd_len - super_sub_len], super_sub))
+			die (_("BUG: returned path string doesn't match cwd?"));
+
+		super_wt = xstrdup(cwd);
+		super_wt[cwd_len - super_sub_len] = '\0';
+
+		ret = real_path(super_wt);
+		free(super_wt);
+	}
+	strbuf_release(&sb);
+
+	code = finish_command(&cp);
+
+	if (code == 128)
+		/* '../' is not a git repository */
+		return NULL;
+	if (code == 0 && len == 0)
+		/* There is an unrelated git repository at '../' */
+		return NULL;
+	if (code)
+		die(_("ls-tree returned unexpected return code %d"), code);
+
+	return ret;
+}