/*

  * Copyright (C) 2008  Kristian Høgsberg <krh@redhat.com>

  * Copyright (C) 2008  Red Hat, Inc

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License along

  * with this program; if not, write to the Free Software Foundation, Inc.,

  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

  */

 #include <stdlib.h>

 #include <stddef.h>

 #include <stdio.h>

 #include <stdint.h>

 #include <string.h>

 #include <sys/stat.h>

 #include <unistd.h>

 #include <fcntl.h>

 #include <dirent.h>

 #include <curl/curl.h>

 #include <fnmatch.h>

 #include <errno.h>

 #include "razor.h"

 #include "razor-internal.h"

 static const char system_repo_filename[] = "system.repo";

 static const char next_repo_filename[] = "system-next.repo";

 static const char rawhide_repo_filename[] = "rawhide.repo";

 static const char updated_repo_filename[] = "system-updated.repo";

 static const char razor_root_path[] = "/var/lib/razor";

 static const char root[] = "install";

 static const char *repo_filename = system_repo_filename;

 static int

 command_list(int argc, const char *argv[])

 {

 	struct razor_set *set;

 	struct razor_package_iterator *pi;

 	struct razor_package *package;

 	const char *pattern, *name, *version, *arch;

 	int only_names = 0, i = 0;

 	if (i < argc && strcmp(argv[i], "--only-names") == 0) {

 		only_names = 1;

 		i++;

 	}

 	pattern = argv[i];

 	set = razor_set_open(repo_filename);

 	pi = razor_package_iterator_create(set);

 	while (razor_package_iterator_next(pi, &package,

 					   &name, &version, &arch)) {

 		if (pattern && fnmatch(pattern, name, 0) != 0)

 			continue;

 		if (only_names)

 			printf("%s\n", name);

 		else

 			printf("%s-%s.%s\n", name, version, arch);

 	}

 	razor_package_iterator_destroy(pi);

 	razor_set_destroy(set);

 	return 0;

 }

 static int

 list_properties(const char *package_name,

 		enum razor_property_type required_type)

 {

 	struct razor_set *set;

 	struct razor_property *property;

 	struct razor_package *package;

 	struct razor_property_iterator *pi;

 	const char *name, *version;

 	enum razor_property_type type;

 	enum razor_version_relation relation;

 	set = razor_set_open(repo_filename);

 	if (package_name)

 		package = razor_set_get_package(set, package_name);

 	else

 		package = NULL;

 	pi = razor_property_iterator_create(set, package);

 	while (razor_property_iterator_next(pi, &property,

 					    &name, &relation, &version,

 					    &type)) {

 		if (type != required_type)

 			continue;

 		if (version[0] == '\0')

 			printf("%s\n", name);

 		else

 			printf("%s %s %s\n", name,

 			       razor_version_relations[relation], version);

 	}

 	razor_property_iterator_destroy(pi);

 	razor_set_destroy(set);

 	return 0;

 }

 static int

 command_list_requires(int argc, const char *argv[])

 {

 	return list_properties(argv[0], RAZOR_PROPERTY_REQUIRES);

 }

 static int

 command_list_provides(int argc, const char *argv[])

 {

 	return list_properties(argv[0], RAZOR_PROPERTY_PROVIDES);

 }

 static int

 command_list_obsoletes(int argc, const char *argv[])

 {

 	return list_properties(argv[0], RAZOR_PROPERTY_OBSOLETES);

 }

 static int

 command_list_conflicts(int argc, const char *argv[])

 {

 	return list_properties(argv[0], RAZOR_PROPERTY_CONFLICTS);

 }

 static int

 command_list_files(int argc, const char *argv[])

 {

 	struct razor_set *set;

 	set = razor_set_open(repo_filename);

 	if (set == NULL)

 		return 1;

 	razor_set_list_files(set, argv[0]);

 	razor_set_destroy(set);

 	return 0;

 }

 static int

 command_list_file_packages(int argc, const char *argv[])

 {

 	struct razor_set *set;

 	struct razor_package_iterator *pi;

 	struct razor_package *package;

 	const char *name, *version, *arch;

 	set = razor_set_open(repo_filename);

 	if (set == NULL)

 		return 1;

 	pi = razor_package_iterator_create_for_file(set, argv[0]);

 	while (razor_package_iterator_next(pi, &package,

 					   &name, &version, &arch))

 		printf("%s-%s\n", name, version);

 	razor_package_iterator_destroy(pi);

 	razor_set_destroy(set);

 	return 0;

 }

 static int

 command_list_package_files(int argc, const char *argv[])

 {

 	struct razor_set *set;

 	set = razor_set_open(repo_filename);

 	if (set == NULL)

 		return 1;

 	razor_set_list_package_files(set, argv[0]);

 	razor_set_destroy(set);

 	return 0;

 }

 static void

 list_packages_for_property(struct razor_set *set,

 			   struct razor_property *property)

 {

 	struct razor_package_iterator *pi;

 	struct razor_package *package;

 	const char *name, *version, *arch;

 	pi = razor_package_iterator_create_for_property(set, property);

 	while (razor_package_iterator_next(pi, &package,

 					   &name, &version, &arch))

 		printf("%s-%s.%s\n", name, version, arch);

 	razor_package_iterator_destroy(pi);

 }

 static int

 list_property_packages(const char *ref_name,

 		       const char *ref_version,

 		       enum razor_property_type ref_type)

 {

 	struct razor_set *set;

 	struct razor_property *property;

 	struct razor_property_iterator *pi;

 	const char *name, *version;

 	enum razor_property_type type;

 	enum razor_version_relation relation;

 	if (ref_name == NULL)

 		return 0;

 	set = razor_set_open(repo_filename);

 	if (set == NULL)

 		return 1;

 	pi = razor_property_iterator_create(set, NULL);

 	while (razor_property_iterator_next(pi, &property,

 					    &name, &relation, &version,

 					    &type)) {

 		if (strcmp(ref_name, name) != 0)

 			continue;

 		if (ref_version && relation == RAZOR_VERSION_EQUAL &&

 		    strcmp(ref_version, version) != 0)

 			continue;

 		if (ref_type != type)

 			continue;

 		list_packages_for_property(set, property);

 	}

 	razor_property_iterator_destroy(pi);

 	return 0;

 }

 static int

 command_what_requires(int argc, const char *argv[])

 {

 	return list_property_packages(argv[0], argv[1],

 				      RAZOR_PROPERTY_REQUIRES);

 }

 static int

 command_what_provides(int argc, const char *argv[])

 {

 	return list_property_packages(argv[0], argv[1],

 				      RAZOR_PROPERTY_PROVIDES);

 }

 static int

 show_progress(void *clientp,

 	      double dltotal, double dlnow, double ultotal, double ulnow)

 {

 	const char *file = clientp;

 	if (!dlnow < dltotal)

 		fprintf(stderr, "\rdownloading %s, %dkB/%dkB",

 			file, (int) dlnow / 1024, (int) dltotal / 1024);

 	return 0;

 }

 static int

 download_if_missing(const char *url, const char *file)

 {

 	CURL *curl;

 	struct stat buf;

 	char error[256];

 	FILE *fp;

 	CURLcode res;

 	long response;

 	curl = curl_easy_init();

 	if (curl == NULL)

 		return 1;

 	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, error);

 	curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0);

 	curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, show_progress);

 	curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, file);

 	if (stat(file, &buf) < 0) {

 		fp = fopen(file, "w");

 		if (fp == NULL) {

 			fprintf(stderr,

 				"failed to open %s for writing\n", file);

 			return -1;

 		}

 		curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);

 		curl_easy_setopt(curl, CURLOPT_URL, url);

 		res = curl_easy_perform(curl);

 		fclose(fp);

 		if (res != CURLE_OK) {

 			fprintf(stderr, "curl error: %s\n", error);

 			unlink(file);

 			return -1;

 		}

 		res = curl_easy_getinfo(curl,

 					CURLINFO_RESPONSE_CODE, &response);

 		if (res != CURLE_OK) {

 			fprintf(stderr, "curl error: %s\n", error);

                         unlink(file);

                         return -1;

 		}

 		if (response != 200) {

 			fprintf(stderr, " - failed %ld\n", response);

                         unlink(file);

                         return -1;

 		}

 		fprintf(stderr, "\n");

 	}

 	curl_easy_cleanup(curl);

 	return 0;

 }

 #define REPO_URL "http://download.fedora.redhat.com" \

 	"/pub/fedora/linux/development/i386/os"

 static int

 command_import_yum(int argc, const char *argv[])

 {

 	struct razor_set *set;

 	if (download_if_missing(REPO_URL "/repodata/primary.xml.gz",

 				"primary.xml.gz") < 0)

 		return -1;

 	if (download_if_missing(REPO_URL "/repodata/filelists.xml.gz",

 				"filelists.xml.gz") < 0)

 		return -1;

 	set = razor_set_create_from_yum();

 	if (set == NULL)

 		return 1;

 	razor_set_write(set, rawhide_repo_filename);

 	razor_set_destroy(set);

 	printf("wrote %s\n", rawhide_repo_filename);

 	return 0;

 }

 static int

 command_import_rpmdb(int argc, const char *argv[])

 {

 	struct razor_set *set;

 	set = razor_set_create_from_rpmdb();

 	if (set == NULL)

 		return 1;

 	razor_set_write(set, repo_filename);

 	razor_set_destroy(set);

 	printf("wrote %s\n", repo_filename);

 	return 0;

 }

 static int

 command_validate(int argc, const char *argv[])

 {

 	struct razor_set *set;

 	set = razor_set_open(repo_filename);

 	if (set == NULL)

 		return 1;

 	razor_set_list_unsatisfied(set);

 	razor_set_destroy(set);

 	return 0;

 }

 static int

 mark_packages_for_update(struct razor_transaction *trans,

 			 struct razor_set *set, const char *pattern)

 {

 	struct razor_package_iterator *pi;

 	struct razor_package *package;

 	const char *name, *version, *arch;

 	int matches = 0;

 	pi = razor_package_iterator_create(set);

 	while (razor_package_iterator_next(pi, &package,

 					   &name, &version, &arch)) {

 		if (pattern && fnmatch(pattern, name, 0) == 0) {

 			razor_transaction_install_package(trans, package);

 			matches++;

 		}

 	}

 	razor_package_iterator_destroy(pi);

 	return matches;

 }

 static int

 mark_packages_for_removal(struct razor_transaction *trans,

 			  struct razor_set *set, const char *pattern)

 {

 	struct razor_package_iterator *pi;

 	struct razor_package *package;

 	const char *name, *version, *arch;

 	int matches = 0;

 	pi = razor_package_iterator_create(set);

 	while (razor_package_iterator_next(pi, &package,

 					   &name, &version, &arch)) {

 		if (pattern && fnmatch(pattern, name, 0) == 0) {

 			razor_transaction_remove_package(trans, package);

 			matches++;

 		}

 	}

 	razor_package_iterator_destroy(pi);

 	return matches;

 }

 static int

 command_update(int argc, const char *argv[])

 {

 	struct razor_set *set, *upstream;

 	struct razor_transaction *trans;

 	int i, errors;

 	set = razor_set_open(repo_filename);

 	upstream = razor_set_open(rawhide_repo_filename);

 	if (set == NULL || upstream == NULL)

 		return 1;

 	trans = razor_transaction_create(set, upstream);

 	if (argc == 0)

 		razor_transaction_update_all(trans);

 	for (i = 0; i < argc; i++) {

 		if (mark_packages_for_update(trans, upstream, argv[i]) == 0) {

 			fprintf(stderr, "no match for %s\n", argv[i]);

 			return 1;

 		}

 	}

 	errors = razor_transaction_resolve(trans);

 	if (errors)

 		return 1;

 	set = razor_transaction_finish(trans);

 	razor_set_write(set, updated_repo_filename);

 	razor_set_destroy(set);

 	razor_set_destroy(upstream);

 	printf("wrote system-updated.repo\n");

 	return 0;

 }

 static int

 command_remove(int argc, const char *argv[])

 {

 	struct razor_set *set;

 	struct razor_transaction *trans;

 	int i, errors;

 	set = razor_set_open(repo_filename);

 	if (set == NULL)

 		return 1;

 	trans = razor_transaction_create(set, NULL);

 	for (i = 0; i < argc; i++) {

 		if (mark_packages_for_removal(trans, set, argv[i]) == 0) {

 			fprintf(stderr, "no match for %s\n", argv[i]);

 			return 1;

 		}

 	}

 	errors = razor_transaction_resolve(trans);

 	if (errors)

 		return 1;

 	set = razor_transaction_finish(trans);

 	razor_set_write(set, updated_repo_filename);

 	razor_set_destroy(set);

 	printf("wrote system-updated.repo\n");

 	return 0;

 }

 static void

 print_diff(const char *name,

 	   const char *old_version, const char *new_version, const char *arch,

 	   void *data)

 {

 	if (old_version)

 		printf("removing %s %s\n", name, old_version);

 	else

 		printf("install %s %s\n", name, new_version);

 }

 static int

 command_diff(int argc, const char *argv[])

 {

 	struct razor_set *set, *updated;

 	set = razor_set_open(repo_filename);

 	updated = razor_set_open(updated_repo_filename);

 	if (set == NULL || updated == NULL)

 		return 1;

 	razor_set_diff(set, updated, print_diff, NULL);	

 	razor_set_destroy(set);

 	razor_set_destroy(updated);

 	return 0;

 }

 static int

 command_import_rpms(int argc, const char *argv[])

 {

 	DIR *dir;

 	struct dirent *de;

 	struct razor_importer *importer;

 	struct razor_set *set;

 	struct razor_rpm *rpm;

 	int len;

 	char filename[256];

 	const char *dirname = argv[0];

 	if (dirname == NULL) {

 		fprintf(stderr, "usage: razor import-rpms DIR\n");

 		return -1;

 	}

 	dir = opendir(dirname);

 	if (dir == NULL) {

 		fprintf(stderr, "couldn't read dir %s\n", dirname);

 		return -1;

 	}

 	importer = razor_importer_new();

 	while (de = readdir(dir), de != NULL) {

 		len = strlen(de->d_name);

 		if (len < 5 || strcmp(de->d_name + len - 4, ".rpm") != 0)

 		    continue;

 		snprintf(filename, sizeof filename,

 			 "%s/%s", dirname, de->d_name);

 		rpm = razor_rpm_open(filename);

 		if (rpm == NULL) {

 			fprintf(stderr,

 				"failed to open rpm \"%s\"\n", filename);

 			continue;

 		}

 		if (razor_importer_add_rpm(importer, rpm)) {

 			fprintf(stderr, "couldn't import %s\n", filename);

 			break;

 		}

 		razor_rpm_close(rpm);

 	}

 	if (de != NULL) {

 		razor_importer_destroy(importer);

 		return -1;

 	}

 	set = razor_importer_finish(importer);

 	razor_set_write(set, repo_filename);

 	razor_set_destroy(set);

 	printf("wrote %s\n", repo_filename);

 	return 0;

 }

 static void

 download_package(const char *name,

 		 const char *old_version,

 		 const char *new_version,

 		 const char *arch,

 		 void *data)

 {

 	char file[PATH_MAX], url[256];

 	const char *v;

 	int *errors = data;

 	if (old_version)

 		return;

 	/* Skip epoch */

 	v = strchr(new_version, ':');

 	if (v != NULL)

 		v = v + 1;

 	else

 		v = new_version;

 	snprintf(url, sizeof url,

 		 REPO_URL "/Packages/%s-%s.%s.rpm", name, v, arch);

 	snprintf(file, sizeof file,

 		 "rpms/%s-%s.%s.rpm", name, v, arch);

 	if (download_if_missing(url, file) < 0)

 		(*errors)++;

 }

 static void

 install_package(const char *name,

 		const char *old_version,

 		const char *new_version,

 		const char *arch,

 		void *data)

 {

 	const char *v, *root = data;

 	char file[PATH_MAX];

 	struct razor_rpm *rpm;

 	if (old_version) {

 		printf("removing %s %s not handled\n", name, old_version);

 		return;

 	}

 	/* Skip epoch */

 	v = strchr(new_version, ':');

 	if (v != NULL)

 		v = v + 1;

 	else

 		v = new_version;

 	printf("install %s %s\n", name, v);

 	snprintf(file, sizeof file, "rpms/%s-%s.%s.rpm", name, v, arch);

  	rpm = razor_rpm_open(file);

 	if (rpm == NULL) {

 		fprintf(stderr, "failed to open rpm %s\n", file);

 		return;

 	}

 	if (razor_rpm_install(rpm, root) < 0) {

 		fprintf(stderr,

 			"failed to install rpm %s\n", file);

 		return;

 	}

 	razor_rpm_close(rpm);

 }

 static int

 command_install(int argc, const char *argv[])

 {

 	struct razor_set *system, *upstream, *next;

 	struct razor_transaction *trans;

 	char path[PATH_MAX], new_path[PATH_MAX];

 	int i = 0, errors, fd, dependencies = 1;

 	if (i < argc && strcmp(argv[i], "--no-dependencies") == 0) {

 		dependencies = 0;

 		i++;

 	}

 	/* Create the new next repo file up front to ensure exclusive

 	 * access. */

 	snprintf(new_path, sizeof new_path,

 		 "%s%s/%s", root, razor_root_path, next_repo_filename);

 	fd = open(new_path, O_CREAT | O_WRONLY | O_TRUNC | O_EXCL, 0666);

 	if (fd < 0) {

 		fprintf(stderr, "failed to get lock file, "

 			"maybe previous operation crashed?\n");

 		/* FIXME: Use fcntl advisory locking to figure out

 		 * whether previous operation crashed or is still in

 		 * progress. */

 		return -1;

 	}

 	upstream = razor_set_open(rawhide_repo_filename);

 	snprintf(path, sizeof path,

 		 "%s%s/%s", root, razor_root_path, system_repo_filename);

 	system = razor_set_open(path);

 	if (system == NULL || upstream == NULL) {

 		unlink(new_path);

 		return 1;

 	}

 	trans = razor_transaction_create(system, upstream);

 	for (; i < argc; i++) {

 		if (mark_packages_for_update(trans, upstream, argv[i]) == 0) {

 			fprintf(stderr, "no package matched %s\n", argv[i]);

 			unlink(new_path);

 			return 1;

 		}

 	}

 	if (dependencies) {

 		errors = razor_transaction_resolve(trans);

 		if (errors) {

 			unlink(new_path);

 			return 1;

 		}

 	}

 	next = razor_transaction_finish(trans);

 	razor_set_write_to_fd(next, fd);

 	printf("wrote %s\n", new_path);

 	if (mkdir("rpms", 0777) && errno != EEXIST) {

 		fprintf(stderr, "failed to create rpms directory.\n");

 		return 1;

 	}

 	razor_set_diff(system, next, download_package, &errors);

 	if (errors > 0) {

 		fprintf(stderr, "failed to download %d packages\n", errors);

 		unlink(new_path);

                 return 1;

         }

 	/* FIXME: We need to figure out the right install order here,

 	 * so the post and pre scripts can run. */

 	razor_set_diff(system, next, install_package, (void *) root);

 	razor_set_destroy(next);

 	razor_set_destroy(system);

 	razor_set_destroy(upstream);

 	/* Make it so. */

 	rename(new_path, path);

 	printf("renamed %s to %s\n", new_path, path);

 	return 0;

 }

 static int

 command_init(int argc, const char *argv[])

 {

 	struct stat buf;

 	struct razor_set *set;

 	char path[PATH_MAX];

 	if (stat(root, &buf) < 0) {

 		if (mkdir(root, 0777) < 0) {

 			fprintf(stderr,

 				"could not create install root \"%s\"\n",

 				root);

 			return -1;

 		}

 		fprintf(stderr, "created install root \"%s\"\n", root);

 	} else if (!S_ISDIR(buf.st_mode)) {

 		fprintf(stderr,

 			"install root \"%s\" exists, but is not a directory\n",

 			root);

 		return -1;

 	}

 	snprintf(path, sizeof path, "%s/%s",

 		 razor_root_path, system_repo_filename);

 	if (razor_create_dir(root, path) < 0) {

 		fprintf(stderr, "could not create %s%s\n",

 			root, razor_root_path);

 		return -1;

 	}

 	set = razor_set_create();

 	snprintf(path, sizeof path, "%s%s/%s",

 		 root, razor_root_path, system_repo_filename);

 	if (razor_set_write(set, path) < 0) {

 		fprintf(stderr, "could not write initial package set\n");

 		return -1;

 	}

 	razor_set_destroy(set);

 	return 0;

 }

 static int

 command_download(int argc, const char *argv[])

 {

 	struct razor_set *set;

 	struct razor_package_iterator *pi;

 	struct razor_package *package;

 	const char *pattern = argv[0], *name, *version, *arch;

 	char url[256], file[256];

 	int matches = 0;

 	if (mkdir("rpms", 0777) && errno != EEXIST) {

 		fprintf(stderr, "failed to create rpms directory.\n");

 		return 1;

 	}

 	set = razor_set_open(rawhide_repo_filename);

 	pi = razor_package_iterator_create(set);

 	while (razor_package_iterator_next(pi, &package,

 					   &name, &version, &arch)) {

 		if (pattern && fnmatch(pattern, name, 0) != 0)

 			continue;

 		matches++;

 		snprintf(url, sizeof url,

 			 REPO_URL "/Packages/%s-%s.%s.rpm",

 			 name, version, arch);

 		snprintf(file, sizeof file,

 			 "rpms/%s-%s.%s.rpm", name, version, arch);

 		download_if_missing(url, file);

 	}

 	razor_package_iterator_destroy(pi);

 	razor_set_destroy(set);

 	if (matches == 0)

 		fprintf(stderr, "no packages matched \"%s\"\n", pattern);

 	else if (matches == 1)

 		fprintf(stderr, "downloaded 1 package\n");

 	else

 		fprintf(stderr, "downloaded %d packages\n", matches);

 	return 0;

 }

 static struct {

 	const char *name;

 	const char *description;

 	int (*func)(int argc, const char *argv[]);

 } razor_commands[] = {

 	{ "list", "list all packages", command_list },

 	{ "list-requires", "list all requires for the given package", command_list_requires },

 	{ "list-provides", "list all provides for the given package", command_list_provides },

 	{ "list-obsoletes", "list all obsoletes for the given package", command_list_obsoletes },

 	{ "list-conflicts", "list all conflicts for the given package", command_list_conflicts },

 	{ "list-files", "list files for package set", command_list_files },

 	{ "list-file-packages", "list packages owning file", command_list_file_packages },

 	{ "list-package-files", "list files in package", command_list_package_files },

 	{ "what-requires", "list the packages that have the given requires", command_what_requires },

 	{ "what-provides", "list the packages that have the given provides", command_what_provides },

 	{ "import-yum", "import yum metadata files", command_import_yum },

 	{ "import-rpmdb", "import the system rpm database", command_import_rpmdb },

 	{ "import-rpms", "import rpms from the given directory", command_import_rpms },

 	{ "validate", "validate a package set", command_validate },

 	{ "update", "update all or specified packages", command_update },

 	{ "remove", "remove specified packages", command_remove },

 	{ "diff", "show diff between two package sets", command_diff },

 	{ "install", "install rpm", command_install },

 	{ "init", "init razor root", command_init },

 	{ "download", "download packages", command_download }

 };

 static int

 usage(void)

 {

 	int i;

 	printf("usage:\n");

 	for (i = 0; i < ARRAY_SIZE(razor_commands); i++)

 		printf("  %-20s%s\n",

 		       razor_commands[i].name, razor_commands[i].description);

 	return 1;

 }

 int

 main(int argc, const char *argv[])

 {

 	char *repo;

 	int i;

 	repo = getenv("RAZOR_REPO");

 	if (repo != NULL)

 		repo_filename = repo;

 	if (argc < 2)

 		return usage();

 	for (i = 0; i < ARRAY_SIZE(razor_commands); i++)

 		if (strcmp(razor_commands[i].name, argv[1]) == 0)

 			return razor_commands[i].func(argc - 2, argv + 2);

 	return usage();

 }