commands/probe.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2009  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/types.h>
  20 #include <grub/misc.h>
  21 #include <grub/mm.h>
  22 #include <grub/err.h>
  23 #include <grub/dl.h>
  24 #include <grub/device.h>
  25 #include <grub/disk.h>
  26 #include <grub/partition.h>
  27 #include <grub/net.h>
  28 #include <grub/fs.h>
  29 #include <grub/file.h>
  30 #include <grub/misc.h>
  31 #include <grub/env.h>
  32 #include <grub/extcmd.h>
  33
  34 static const struct grub_arg_option options[] =
  35   {
  36     {"set",             's', GRUB_ARG_OPTION_OPTIONAL,
  37      "set a variable to return value", "VAR", ARG_TYPE_STRING},
  38     {"driver",          'd', 0, "determine driver", 0, 0},
  39     {"partmap",         'p', 0, "determine partition map type", 0, 0},
  40     {"fs",              'f', 0, "determine filesystem type", 0, 0},
  41     {"fs-uuid",         'u', 0, "determine filesystem UUID", 0, 0},
  42     {"label",           'l', 0, "determine filesystem label", 0, 0},
  43     {0, 0, 0, 0, 0, 0}
  44   };
  45
  46 static grub_err_t
  47 grub_cmd_probe (grub_extcmd_t cmd, int argc, char **args)
  48 {
  49   struct grub_arg_list *state = cmd->state;
  50   grub_device_t dev;
  51   grub_fs_t fs;
  52   char *ptr;
  53   grub_err_t err;
  54
  55   if (argc < 1)
  56     return grub_error (GRUB_ERR_BAD_ARGUMENT, "device name required");
  57
  58   ptr = args[0] + grub_strlen (args[0]) - 1;
  59   if (args[0][0] == '(' && *ptr == ')')
  60     {
  61       *ptr = 0;
  62       dev = grub_device_open (args[0] + 1);
  63       *ptr = ')';
  64     }
  65   else
  66     dev = grub_device_open (args[0]);
  67   if (! dev)
  68     return grub_error (GRUB_ERR_BAD_DEVICE, "couldn't open device");
  69
  70   if (state[1].set)
  71     {
  72       const char *val = "none";
  73       if (dev->net)
  74         val = dev->net->dev->name;
  75       if (dev->disk)
  76         val = dev->disk->dev->name;
  77       if (state[0].set)
  78         grub_env_set (state[0].arg, val);
  79       else
  80         grub_printf ("%s", val);
  81       return GRUB_ERR_NONE;
  82     }
  83   if (state[2].set)
  84     {
  85       const char *val = "none";
  86       if (dev->disk && dev->disk->partition)
  87         val = dev->disk->partition->partmap->name;
  88       if (state[0].set)
  89         grub_env_set (state[0].arg, val);
  90       else
  91         grub_printf ("%s", val);
  92       return GRUB_ERR_NONE;
  93     }
  94   fs = grub_fs_probe (dev);
  95   if (! fs)
  96     return grub_error (GRUB_ERR_UNKNOWN_FS, "unrecognised fs");
  97   if (state[3].set)
  98     {
  99       if (state[0].set)
 100         grub_env_set (state[0].arg, fs->name);
 101       else
 102         grub_printf ("%s", fs->name);
 103       return GRUB_ERR_NONE;
 104     }
 105   if (state[4].set)
 106     {
 107       char *uuid;
 108       if (! fs->uuid)
 109         return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 110                            "uuid for this FS isn't supported yet");
 111       err = fs->uuid (dev, &uuid);
 112       if (err)
 113         return err;
 114       if (! uuid)
 115         return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 116                            "uuid for this FS isn't supported yet");
 117
 118       if (state[0].set)
 119         grub_env_set (state[0].arg, uuid);
 120       else
 121         grub_printf ("%s", uuid);
 122       grub_free (uuid);
 123       return GRUB_ERR_NONE;
 124     }
 125   if (state[5].set)
 126     {
 127       char *label;
 128       if (! fs->label)
 129         return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 130                            "label for this FS isn't supported yet");
 131       err = fs->label (dev, &label);
 132       if (err)
 133         return err;
 134       if (! label)
 135         return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 136                            "uuid for this FS isn't supported yet");
 137
 138       if (state[0].set)
 139         grub_env_set (state[0].arg, label);
 140       else
 141         grub_printf ("%s", label);
 142       grub_free (label);
 143       return GRUB_ERR_NONE;
 144     }
 145   return grub_error (GRUB_ERR_BAD_ARGUMENT, "unrecognised target");
 146 }
 147
 148 static grub_extcmd_t cmd;
 149
 150 GRUB_MOD_INIT (probe)
 151 {
 152   cmd = grub_register_extcmd ("probe", grub_cmd_probe, GRUB_COMMAND_FLAG_BOTH,
 153                               "probe [DEVICE]",
 154                               "Retrieve device info.", options);
 155 }
 156
 157 GRUB_MOD_FINI (probe)
 158 {
 159   grub_unregister_extcmd (cmd);
 160 }