| /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| * |
| * Driver for using rootdev.c from the commandline |
| */ |
| #include <err.h> |
| #include <errno.h> |
| #include <getopt.h> |
| #include <linux/limits.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include "rootdev.h" |
| |
| static void print_help(const char *progname) { |
| fprintf(stderr, |
| "%s [OPTIONS] [PATH]\n" |
| "Outputs the containing device for the specified PATH.\n" |
| "With no arguments, '/' is assumed.\n" |
| "\n" |
| "Options:\n" |
| " -h\tthis message.\n" |
| "\n" |
| " -c\tcreate the /dev node if it cannot be found\n" |
| " -d\treturn the block device only if possible\n" |
| " -i\treturn path even if the node doesn't exist\n" |
| " -s\tif possible, return the first slave of the root device\n" |
| "\n" |
| " --block [path]\tset the path to block under the sys mount point\n" |
| " --dev [path]\tset the path to dev mount point\n" |
| " --major [num]\tset the major number of the rootdev\n" |
| " --minor [num]\tset the minor number of the rootdev\n", |
| progname); |
| } |
| |
| static int flag_help = 0; |
| static int flag_use_slave = 0; |
| static int flag_strip_partition = 0; |
| static int flag_ignore = 0; |
| static int flag_create = 0; |
| static int flag_major = 0; |
| static int flag_minor = 0; |
| static const char *flag_path = "/"; |
| static char *flag_block_path = "/sys/block"; |
| static char *flag_dev_path = "/dev"; |
| |
| static void parse_args(int argc, char **argv) { |
| while (1) { |
| int c; |
| int option_index = 0; |
| static const struct option long_options[] = { |
| {"c", no_argument, &flag_create, 1}, |
| {"d", no_argument, &flag_strip_partition, 1}, |
| {"h", no_argument, &flag_help, 1}, |
| {"i", no_argument, &flag_ignore, 1}, |
| {"s", no_argument, &flag_use_slave, 1}, |
| /* Long arguments for testing. */ |
| {"block", required_argument, NULL, 'b'}, |
| {"dev", required_argument, NULL, 'd'}, |
| {"major", required_argument, NULL, 'M'}, |
| {"minor", required_argument, NULL, 'm'}, |
| {0, 0, 0, 0} |
| }; |
| c = getopt_long_only(argc, argv, "", long_options, &option_index); |
| |
| if (c == -1) |
| break; |
| |
| if (c == '?') { |
| flag_help = 1; |
| break; |
| } |
| |
| switch (c) { |
| case 'b': |
| flag_block_path = optarg; |
| break; |
| case 'd': |
| flag_dev_path = optarg; |
| break; |
| case 'M': |
| flag_major = atoi(optarg); |
| break; |
| case 'm': |
| flag_minor = atoi(optarg); |
| break; |
| } |
| |
| } |
| |
| if (flag_create && flag_strip_partition) { |
| flag_help = 1; |
| warnx("-c and -d are incompatible at present."); |
| return; |
| } |
| |
| if (optind < argc) { |
| flag_path = argv[optind++]; |
| } |
| |
| if (optind < argc) { |
| fprintf(stderr, "Too many free arguments: %d\n", argc - optind); |
| flag_help = 1; |
| } |
| } |
| |
| int main(int argc, char **argv) { |
| struct stat path_stat; |
| char path[PATH_MAX]; |
| int ret; |
| dev_t root_dev; |
| parse_args(argc, argv); |
| |
| if (flag_help) { |
| print_help(argv[0]); |
| return 1; |
| } |
| |
| if (flag_major || flag_minor) { |
| root_dev = makedev(flag_major, flag_minor); |
| } else { |
| /* Yields the containing dev_t in st_dev. */ |
| if (stat(flag_path, &path_stat) != 0) |
| err(1, "Cannot stat(%s)", flag_path); |
| root_dev = path_stat.st_dev; |
| } |
| |
| ret = rootdev_wrapper(path, sizeof(path), |
| flag_use_slave, |
| flag_strip_partition, |
| &root_dev, |
| flag_block_path, |
| flag_dev_path); |
| |
| if (ret == 1 && flag_create) { |
| /* TODO(wad) add flag_force to allow replacement */ |
| ret = 0; |
| if (mknod(path, S_IFBLK | S_IRUSR | S_IWUSR, root_dev) && errno != EEXIST) { |
| warn("failed to create %s", path); |
| ret = 1; |
| } |
| } |
| |
| if (flag_ignore && ret > 0) |
| ret = 0; |
| |
| if (path[0] != '\0') |
| printf("%s\n", path); |
| |
| return ret; |
| } |