Function sparse_checkout_init

builtin/sparse-checkout.c:456–521

} init_opts;

static int sparse_checkout_init(int argc, const char **argv, const char *prefix,
				struct repository *repo)
{
	struct pattern_list pl;
	char *sparse_filename;
	int res;
	struct object_id oid;

	static struct option builtin_sparse_checkout_init_options[] = {
		OPT_BOOL(0, "cone", &init_opts.cone_mode,
			 N_("initialize the sparse-checkout in cone mode")),
		OPT_BOOL(0, "sparse-index", &init_opts.sparse_index,
			 N_("toggle the use of a sparse index")),
		OPT_END(),
	};

	setup_work_tree(the_repository);
	repo_read_index(repo);

	init_opts.cone_mode = -1;
	init_opts.sparse_index = -1;

	argc = parse_options(argc, argv, prefix,
			     builtin_sparse_checkout_init_options,
			     builtin_sparse_checkout_init_usage, 0);

	if (update_modes(repo, &init_opts.cone_mode, &init_opts.sparse_index))
		return 1;

	memset(&pl, 0, sizeof(pl));

	sparse_filename = get_sparse_checkout_filename();
	res = add_patterns_from_file_to_list(sparse_filename, "", 0, &pl, NULL, 0);

	/* If we already have a sparse-checkout file, use it. */
	if (res >= 0) {
		free(sparse_filename);
		clear_pattern_list(&pl);
		return update_working_directory(repo, NULL);
	}

	if (repo_get_oid(repo, "HEAD", &oid)) {
		FILE *fp;

		/* assume we are in a fresh repo, but update the sparse-checkout file */
		if (safe_create_leading_directories(repo, sparse_filename))
			die(_("unable to create leading directories of %s"),
			    sparse_filename);
		fp = xfopen(sparse_filename, "w");
		if (!fp)
			die(_("failed to open '%s'"), sparse_filename);

		free(sparse_filename);
		fprintf(fp, "/*\n!/*/\n");
		fclose(fp);
		return 0;
	}