grub-core/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 #include <grub/i18n.h>
  34
  35 GRUB_MOD_LICENSE ("GPLv3+");
  36
  37 static const struct grub_arg_option options[] =
  38   {
  39     {"set",             's', 0,
  40      N_("Set a variable to return value."), N_("VARNAME"), ARG_TYPE_STRING},
  41     /* TRANSLATORS: It's a driver that is currently in use to access
  42        the diven disk.  */
  43     {"driver",          'd', 0, N_("Determine driver."), 0, 0},
  44     {"partmap",         'p', 0, N_("Determine partition map type."), 0, 0},
  45     {"fs",              'f', 0, N_("Determine filesystem type."), 0, 0},
  46     {"fs-uuid",         'u', 0, N_("Determine filesystem UUID."), 0, 0},
  47     {"label",           'l', 0, N_("Determine filesystem label."), 0, 0},
  48     {0, 0, 0, 0, 0, 0}
  49   };
  50
  51 static grub_err_t
  52 grub_cmd_probe (grub_extcmd_context_t ctxt, int argc, char **args)
  53 {
  54   struct grub_arg_list *state = ctxt->state;
  55   grub_device_t dev;
  56   grub_fs_t fs;
  57   char *ptr;
  58   grub_err_t err;
  59
  60   if (argc < 1)
  61     return grub_error (GRUB_ERR_BAD_ARGUMENT, "device name required");
  62
  63   ptr = args[0] + grub_strlen (args[0]) - 1;
  64   if (args[0][0] == '(' && *ptr == ')')
  65     {
  66       *ptr = 0;
  67       dev = grub_device_open (args[0] + 1);
  68       *ptr = ')';
  69     }
  70   else
  71     dev = grub_device_open (args[0]);
  72   if (! dev)
  73     return grub_errno;
  74
  75   if (state[1].set)
  76     {
  77       const char *val = "none";
  78       if (dev->net)
  79         val = dev->net->protocol->name;
  80       if (dev->disk)
  81         val = dev->disk->dev->name;
  82       if (state[0].set)
  83         grub_env_set (state[0].arg, val);
  84       else
  85         grub_printf ("%s", val);
  86       grub_device_close (dev);
  87       return GRUB_ERR_NONE;
  88     }
  89   if (state[2].set)
  90     {
  91       const char *val = "none";
  92       if (dev->disk && dev->disk->partition)
  93         val = dev->disk->partition->partmap->name;
  94       if (state[0].set)
  95         grub_env_set (state[0].arg, val);
  96       else
  97         grub_printf ("%s", val);
  98       grub_device_close (dev);
  99       return GRUB_ERR_NONE;
 100     }
 101   fs = grub_fs_probe (dev);
 102   if (! fs)
 103     return grub_errno;
 104   if (state[3].set)
 105     {
 106       if (state[0].set)
 107         grub_env_set (state[0].arg, fs->name);
 108       else
 109         grub_printf ("%s", fs->name);
 110       grub_device_close (dev);
 111       return GRUB_ERR_NONE;
 112     }
 113   if (state[4].set)
 114     {
 115       char *uuid;
 116       if (! fs->uuid)
 117         return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 118                            N_("%s does not support UUIDs"), fs->name);
 119       err = fs->uuid (dev, &uuid);
 120       if (err)
 121         return err;
 122       if (! uuid)
 123         return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 124                            N_("%s does not support UUIDs"), fs->name);
 125
 126       if (state[0].set)
 127         grub_env_set (state[0].arg, uuid);
 128       else
 129         grub_printf ("%s", uuid);
 130       grub_free (uuid);
 131       grub_device_close (dev);
 132       return GRUB_ERR_NONE;
 133     }
 134   if (state[5].set)
 135     {
 136       char *label;
 137       if (! fs->label)
 138         return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 139                            N_("filesystem `%s' does not support labels"),
 140                            fs->name);
 141       err = fs->label (dev, &label);
 142       if (err)
 143         return err;
 144       if (! label)
 145         return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 146                            N_("filesystem `%s' does not support labels"),
 147                            fs->name);
 148
 149       if (state[0].set)
 150         grub_env_set (state[0].arg, label);
 151       else
 152         grub_printf ("%s", label);
 153       grub_free (label);
 154       grub_device_close (dev);
 155       return GRUB_ERR_NONE;
 156     }
 157   grub_device_close (dev);
 158   return grub_error (GRUB_ERR_BAD_ARGUMENT, "unrecognised target");
 159 }
 160
 161 static grub_extcmd_t cmd;
 162
 163 GRUB_MOD_INIT (probe)
 164 {
 165   cmd = grub_register_extcmd ("probe", grub_cmd_probe, 0, N_("DEVICE"),
 166                               N_("Retrieve device info."), options);
 167 }
 168
 169 GRUB_MOD_FINI (probe)
 170 {
 171   grub_unregister_extcmd (cmd);
 172 }