btrfs.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public
   4  * License v2 as published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   9  * General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public
  12  * License along with this program; if not, write to the
  13  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14  * Boston, MA 021110-1307, USA.
  15  */
  16
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20
  21 #include "volumes.h"
  22 #include "crc32c.h"
  23 #include "commands.h"
  24 #include "utils.h"
  25 #include "help.h"
  26
  27 static const char * const btrfs_cmd_group_usage[] = {
  28         "btrfs [--help] [--version] <group> [<group>...] <command> [<args>]",
  29         NULL
  30 };
  31
  32 static const char btrfs_cmd_group_info[] =
  33         "Use --help as an argument for information on a specific group or command.";
  34
  35 static inline const char *skip_prefix(const char *str, const char *prefix)
  36 {
  37         size_t len = strlen(prefix);
  38         return strncmp(str, prefix, len) ? NULL : str + len;
  39 }
  40
  41 static int parse_one_token(const char *arg, const struct cmd_group *grp,
  42                            const struct cmd_struct **cmd_ret)
  43 {
  44         const struct cmd_struct *cmd = grp->commands;
  45         const struct cmd_struct *abbrev_cmd = NULL, *ambiguous_cmd = NULL;
  46
  47         for (; cmd->token; cmd++) {
  48                 const char *rest;
  49
  50                 rest = skip_prefix(arg, cmd->token);
  51                 if (!rest) {
  52                         if (!prefixcmp(cmd->token, arg)) {
  53                                 if (abbrev_cmd) {
  54                                         /*
  55                                          * If this is abbreviated, it is
  56                                          * ambiguous. So when there is no
  57                                          * exact match later, we need to
  58                                          * error out.
  59                                          */
  60                                         ambiguous_cmd = abbrev_cmd;
  61                                 }
  62                                 abbrev_cmd = cmd;
  63                         }
  64                         continue;
  65                 }
  66                 if (*rest)
  67                         continue;
  68
  69                 *cmd_ret = cmd;
  70                 return 0;
  71         }
  72
  73         if (ambiguous_cmd)
  74                 return -2;
  75
  76         if (abbrev_cmd) {
  77                 *cmd_ret = abbrev_cmd;
  78                 return 0;
  79         }
  80
  81         return -1;
  82 }
  83
  84 static const struct cmd_struct *
  85 parse_command_token(const char *arg, const struct cmd_group *grp)
  86 {
  87         const struct cmd_struct *cmd = NULL;
  88
  89         switch(parse_one_token(arg, grp, &cmd)) {
  90         case -1:
  91                 help_unknown_token(arg, grp);
  92         case -2:
  93                 help_ambiguous_token(arg, grp);
  94         }
  95
  96         return cmd;
  97 }
  98
  99 static void handle_help_options_next_level(const struct cmd_struct *cmd,
 100                 int argc, char **argv)
 101 {
 102         if (argc < 2)
 103                 return;
 104
 105         if (!strcmp(argv[1], "--help")) {
 106                 if (cmd->next) {
 107                         argc--;
 108                         argv++;
 109                         help_command_group(cmd->next, argc, argv);
 110                 } else {
 111                         usage_command(cmd, 1, 0);
 112                 }
 113
 114                 exit(0);
 115         }
 116 }
 117
 118 int handle_command_group(const struct cmd_group *grp, int argc,
 119                          char **argv)
 120
 121 {
 122         const struct cmd_struct *cmd;
 123
 124         argc--;
 125         argv++;
 126         if (argc < 1) {
 127                 usage_command_group(grp, 0, 0);
 128                 exit(1);
 129         }
 130
 131         cmd = parse_command_token(argv[0], grp);
 132
 133         handle_help_options_next_level(cmd, argc, argv);
 134
 135         fixup_argv0(argv, cmd->token);
 136         return cmd->fn(argc, argv);
 137 }
 138
 139 static const struct cmd_group btrfs_cmd_group;
 140
 141 static const char * const cmd_help_usage[] = {
 142         "btrfs help [--full]",
 143         "Display help information",
 144         "",
 145         "--full     display detailed help on every command",
 146         NULL
 147 };
 148
 149 static int cmd_help(int argc, char **argv)
 150 {
 151         help_command_group(&btrfs_cmd_group, argc, argv);
 152         return 0;
 153 }
 154
 155 static const char * const cmd_version_usage[] = {
 156         "btrfs version",
 157         "Display btrfs-progs version",
 158         NULL
 159 };
 160
 161 static int cmd_version(int argc, char **argv)
 162 {
 163         printf("%s\n", PACKAGE_STRING);
 164         return 0;
 165 }
 166
 167 static void check_options(int argc, char **argv)
 168 {
 169         const char *arg;
 170
 171         if (argc == 0)
 172                 return;
 173
 174         arg = argv[0];
 175
 176         if (arg[0] != '-' ||
 177             !strcmp(arg, "--help") ||
 178             !strcmp(arg, "--version"))
 179                 return;
 180
 181         fprintf(stderr, "Unknown option: %s\n", arg);
 182         fprintf(stderr, "usage: %s\n",
 183                 btrfs_cmd_group.usagestr[0]);
 184         exit(129);
 185 }
 186
 187 static const struct cmd_group btrfs_cmd_group = {
 188         btrfs_cmd_group_usage, btrfs_cmd_group_info, {
 189                 { "subvolume", cmd_subvolume, NULL, &subvolume_cmd_group, 0 },
 190                 { "filesystem", cmd_filesystem, NULL, &filesystem_cmd_group, 0 },
 191                 { "balance", cmd_balance, NULL, &balance_cmd_group, 0 },
 192                 { "device", cmd_device, NULL, &device_cmd_group, 0 },
 193                 { "scrub", cmd_scrub, NULL, &scrub_cmd_group, 0 },
 194                 { "check", cmd_check, cmd_check_usage, NULL, 0 },
 195                 { "rescue", cmd_rescue, NULL, &rescue_cmd_group, 0 },
 196                 { "restore", cmd_restore, cmd_restore_usage, NULL, 0 },
 197                 { "inspect-internal", cmd_inspect, NULL, &inspect_cmd_group, 0 },
 198                 { "property", cmd_property, NULL, &property_cmd_group, 0 },
 199                 { "send", cmd_send, cmd_send_usage, NULL, 0 },
 200                 { "receive", cmd_receive, cmd_receive_usage, NULL, 0 },
 201                 { "quota", cmd_quota, NULL, &quota_cmd_group, 0 },
 202                 { "qgroup", cmd_qgroup, NULL, &qgroup_cmd_group, 0 },
 203                 { "replace", cmd_replace, NULL, &replace_cmd_group, 0 },
 204                 { "help", cmd_help, cmd_help_usage, NULL, 0 },
 205                 { "version", cmd_version, cmd_version_usage, NULL, 0 },
 206                 NULL_CMD_STRUCT
 207         },
 208 };
 209
 210 int main(int argc, char **argv)
 211 {
 212         const struct cmd_struct *cmd;
 213         const char *bname;
 214         int ret;
 215
 216         btrfs_config_init();
 217
 218         if ((bname = strrchr(argv[0], '/')) != NULL)
 219                 bname++;
 220         else
 221                 bname = argv[0];
 222
 223         if (!strcmp(bname, "btrfsck")) {
 224                 argv[0] = "check";
 225         } else {
 226                 argc--;
 227                 argv++;
 228                 check_options(argc, argv);
 229                 if (argc > 0) {
 230                         if (!prefixcmp(argv[0], "--"))
 231                                 argv[0] += 2;
 232                 } else {
 233                         usage_command_group_short(&btrfs_cmd_group);
 234                         exit(1);
 235                 }
 236         }
 237
 238         cmd = parse_command_token(argv[0], &btrfs_cmd_group);
 239
 240         handle_help_options_next_level(cmd, argc, argv);
 241
 242         crc32c_optimization_init();
 243
 244         fixup_argv0(argv, cmd->token);
 245
 246         ret = cmd->fn(argc, argv);
 247
 248         btrfs_close_all_devices();
 249
 250         exit(ret);
 251 }