submodule: check index for prefix before adding submodule

submodule: check path and prefix before adding submodule


submodule: fix test errors

src/submodule.c

@@ -660,7 +660,10 @@ int git_submodule_add_setup(
 	int use_gitlink)
 {
 	int error = 0;
+	size_t path_len;
+	const char *dir;
 	git_config_backend *mods = NULL;
+	git_index *index;
 	git_submodule *sm = NULL;
 	git_buf name = GIT_BUF_INIT, real_url = GIT_BUF_INIT;
 	git_repository *subrepo = NULL;
@@ -688,6 +691,34 @@ int git_submodule_add_setup(
 		goto cleanup;
 	}
 
+	/* get the index for the repo */
+
+	if ((error = git_repository_index__weakptr(&index, repo)) < 0)
+		goto cleanup;
+
+	/* see if the submodule name exists as a file on the index */
+
+	if ((error = git_index_find(NULL, index, path)) == 0) {
+		giterr_set(GITERR_SUBMODULE,
+			"'%s' already exists in the index", path);
+		return GIT_EEXISTS;
+	}
+
+	/* We need the path to end with '/' so we can check it as a directory prefix */
+
+	path_len = strlen(path);
+	dir = git__malloc(path_len + 1);
+	strcpy(dir, path);
+	git_path_string_to_dir(dir, path_len + 1);
+
+	/* see if the submodule name exists as a directory on the index */
+
+	if ((error = git_index_find_prefix(NULL, index, dir)) == 0) {
+		giterr_set(GITERR_SUBMODULE,
+			"'%s' already exists in the index", path);
+		return GIT_EEXISTS;
+	}
+
 	/* update .gitmodules */
 
 	if (!(mods = open_gitmodules(repo, GITMODULES_CREATE))) {

tests/submodule/add.c

@@ -128,3 +128,69 @@ void test_submodule_add__url_relative_to_workdir(void)
 
 	assert_submodule_url("TestGitRepository", git_repository_workdir(g_repo));
 }
+
+void test_submodule_add__path_exists_in_index(void)
+{
+	git_index *index;
+	git_submodule *sm;
+	git_buf dirname = GIT_BUF_INIT;
+	git_buf filename = GIT_BUF_INIT;
+	FILE *fd;
+
+	/* In this repo, HEAD (master) has no remote tracking branc h*/
+	g_repo = cl_git_sandbox_init("testrepo");
+
+	git_buf_joinpath(&dirname, git_repository_workdir(g_repo), "/TestGitRepository");
+	git_buf_joinpath(&filename, dirname.ptr, "/test.txt");
+
+	mkdir(dirname.ptr, 0700);
+	fd = fopen(filename.ptr, "w");
+	fclose(fd);
+
+	cl_git_pass(
+		git_repository_index__weakptr(&index, g_repo)
+	);
+
+	cl_git_pass(
+		git_index_add_bypath(index, "TestGitRepository/test.txt")
+	);
+
+	cl_git_fail_with(
+		git_submodule_add_setup(&sm, g_repo, "./", "TestGitRepository", 1),
+		GIT_EEXISTS
+	);
+
+	git_buf_free(&dirname);
+	git_buf_free(&filename);
+}
+
+void test_submodule_add__file_exists_in_index(void)
+{
+	git_index *index;
+	git_submodule *sm;
+	git_buf name = GIT_BUF_INIT;
+	FILE *fd;
+
+	/* In this repo, HEAD (master) has no remote tracking branc h*/
+	g_repo = cl_git_sandbox_init("testrepo");
+
+	git_buf_joinpath(&name, git_repository_workdir(g_repo), "/TestGitRepository");
+
+	fd = fopen(name.ptr, "w");
+	fclose(fd);
+
+	cl_git_pass(
+		git_repository_index__weakptr(&index, g_repo)
+	);
+
+	cl_git_pass(
+		git_index_add_bypath(index, "TestGitRepository")
+	);
+
+	cl_git_fail_with(
+		git_submodule_add_setup(&sm, g_repo, "./", "TestGitRepository", 1),
+		GIT_EEXISTS
+	);
+
+	git_buf_free(&name);
+}