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| 1 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| 2 * Use of this source code is governed by a BSD-style license that can be |
| 3 * found in the LICENSE file. |
| 4 * |
| 5 * Driver for using rootdev.c from the commandline |
| 6 */ |
| 7 #include <err.h> |
| 8 #include <errno.h> |
| 9 #include <getopt.h> |
| 10 #include <linux/limits.h> |
| 11 #include <stdbool.h> |
| 12 #include <stdio.h> |
| 13 #include <stdlib.h> |
| 14 #include <string.h> |
| 15 #include <sys/stat.h> |
| 16 #include <sys/types.h> |
| 17 #include <unistd.h> |
| 18 |
| 19 #include "rootdev.h" |
| 20 |
| 21 static void print_help(const char *progname) { |
| 22 fprintf(stderr, |
| 23 "%s [OPTIONS] [PATH]\n" |
| 24 "Outputs the containing device for the specified PATH.\n" |
| 25 "With no arguments, '/' is assumed.\n" |
| 26 "\n" |
| 27 "Options:\n" |
| 28 " -h\tthis message.\n" |
| 29 "\n" |
| 30 " -c\tcreate the /dev node if it cannot be found\n" |
| 31 " -d\treturn the block device only if possible\n" |
| 32 " -i\treturn path even if the node doesn't exist\n" |
| 33 " -s\tif possible, return the first slave of the root device\n" |
| 34 "\n" |
| 35 " --block [path]\tset the path to block under the sys mount point\n" |
| 36 " --dev [path]\tset the path to dev mount point\n" |
| 37 " --major [num]\tset the major number of the rootdev\n" |
| 38 " --minor [num]\tset the minor number of the rootdev\n", |
| 39 progname); |
| 40 } |
| 41 |
| 42 static int flag_help = 0; |
| 43 static int flag_use_slave = 0; |
| 44 static int flag_strip_partition = 0; |
| 45 static int flag_ignore = 0; |
| 46 static int flag_create = 0; |
| 47 static int flag_major = 0; |
| 48 static int flag_minor = 0; |
| 49 static const char *flag_path = "/"; |
| 50 static char *flag_block_path = "/sys/block"; |
| 51 static char *flag_dev_path = "/dev"; |
| 52 |
| 53 static void parse_args(int argc, char **argv) { |
| 54 while (1) { |
| 55 int c; |
| 56 int option_index = 0; |
| 57 static const struct option long_options[] = { |
| 58 {"c", no_argument, &flag_create, 1}, |
| 59 {"d", no_argument, &flag_strip_partition, 1}, |
| 60 {"h", no_argument, &flag_help, 1}, |
| 61 {"i", no_argument, &flag_ignore, 1}, |
| 62 {"s", no_argument, &flag_use_slave, 1}, |
| 63 /* Long arguments for testing. */ |
| 64 {"block", required_argument, NULL, 'b'}, |
| 65 {"dev", required_argument, NULL, 'd'}, |
| 66 {"major", required_argument, NULL, 'M'}, |
| 67 {"minor", required_argument, NULL, 'm'}, |
| 68 {0, 0, 0, 0} |
| 69 }; |
| 70 c = getopt_long_only(argc, argv, "", long_options, &option_index); |
| 71 |
| 72 if (c == -1) |
| 73 break; |
| 74 |
| 75 if (c == '?') { |
| 76 flag_help = 1; |
| 77 break; |
| 78 } |
| 79 |
| 80 switch (c) { |
| 81 case 'b': |
| 82 flag_block_path = optarg; |
| 83 break; |
| 84 case 'd': |
| 85 flag_dev_path = optarg; |
| 86 break; |
| 87 case 'M': |
| 88 flag_major = atoi(optarg); |
| 89 break; |
| 90 case 'm': |
| 91 flag_minor = atoi(optarg); |
| 92 break; |
| 93 } |
| 94 |
| 95 } |
| 96 |
| 97 if (flag_create && flag_strip_partition) { |
| 98 flag_help = 1; |
| 99 warnx("-c and -d are incompatible at present."); |
| 100 return; |
| 101 } |
| 102 |
| 103 if (optind < argc) { |
| 104 flag_path = argv[optind++]; |
| 105 } |
| 106 |
| 107 if (optind < argc) { |
| 108 fprintf(stderr, "Too many free arguments: %d\n", argc - optind); |
| 109 flag_help = 1; |
| 110 } |
| 111 } |
| 112 |
| 113 int main(int argc, char **argv) { |
| 114 struct stat path_stat; |
| 115 char path[PATH_MAX]; |
| 116 int ret; |
| 117 dev_t root_dev; |
| 118 parse_args(argc, argv); |
| 119 |
| 120 if (flag_help) { |
| 121 print_help(argv[0]); |
| 122 return 1; |
| 123 } |
| 124 |
| 125 if (flag_major || flag_minor) { |
| 126 root_dev = makedev(flag_major, flag_minor); |
| 127 } else { |
| 128 /* Yields the containing dev_t in st_dev. */ |
| 129 if (stat(flag_path, &path_stat) != 0) |
| 130 err(1, "Cannot stat(%s)", flag_path); |
| 131 root_dev = path_stat.st_dev; |
| 132 } |
| 133 |
| 134 ret = rootdev_wrapper(path, sizeof(path), |
| 135 flag_use_slave, |
| 136 flag_strip_partition, |
| 137 &root_dev, |
| 138 flag_block_path, |
| 139 flag_dev_path); |
| 140 |
| 141 if (ret == 1 && flag_create) { |
| 142 /* TODO(wad) add flag_force to allow replacement */ |
| 143 ret = 0; |
| 144 if (mknod(path, S_IFBLK | S_IRUSR | S_IWUSR, root_dev) && errno != EEXIST) { |
| 145 warn("failed to create %s", path); |
| 146 ret = 1; |
| 147 } |
| 148 } |
| 149 |
| 150 if (flag_ignore && ret > 0) |
| 151 ret = 0; |
| 152 |
| 153 if (path[0] != '\0') |
| 154 printf("%s\n", path); |
| 155 |
| 156 return ret; |
| 157 } |
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