arch/common/grub2/commands/search.c

   1 /* search.c - search devices based on a file or a filesystem label */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2005,2007  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/types.h>
  21 #include <grub/misc.h>
  22 #include <grub/mm.h>
  23 #include <grub/err.h>
  24 #include <grub/dl.h>
  25 #include <grub/normal.h>
  26 #include <grub/arg.h>
  27 #include <grub/device.h>
  28 #include <grub/file.h>
  29 #include <grub/env.h>
  30
  31 static const struct grub_arg_option options[] =
  32   {
  33     {"file", 'f', 0, "search devices by a file (default)", 0, 0},
  34     {"label", 'l', 0, "search devices by a filesystem label", 0, 0},
  35     {"set", 's', GRUB_ARG_OPTION_OPTIONAL, "set a variable to the first device found", "VAR", ARG_TYPE_STRING},
  36     {0, 0, 0, 0, 0, 0}
  37   };
  38
  39 static void
  40 search_label (const char *key, const char *var)
  41 {
  42   int count = 0;
  43   auto int iterate_device (const char *name);
  44
  45   int iterate_device (const char *name)
  46     {
  47       grub_device_t dev;
  48
  49       dev = grub_device_open (name);
  50       if (dev)
  51         {
  52           grub_fs_t fs;
  53
  54           fs = grub_fs_probe (dev);
  55           if (fs && fs->label)
  56             {
  57               char *label;
  58
  59               (fs->label) (dev, &label);
  60               if (grub_errno == GRUB_ERR_NONE && label)
  61                 {
  62                   if (grub_strcmp (label, key) == 0)
  63                     {
  64                       /* Found!  */
  65                       grub_printf (" %s", name);
  66                       if (count++ == 0 && var)
  67                         grub_env_set (var, name);
  68                     }
  69
  70                   grub_free (label);
  71                 }
  72             }
  73
  74           grub_device_close (dev);
  75         }
  76
  77       grub_errno = GRUB_ERR_NONE;
  78       return 0;
  79     }
  80
  81   grub_device_iterate (iterate_device);
  82
  83   if (count == 0)
  84     grub_error (GRUB_ERR_FILE_NOT_FOUND, "no such device: %s", key);
  85 }
  86
  87 static void
  88 search_file (const char *key, const char *var)
  89 {
  90   int count = 0;
  91   char *buf = 0;
  92   auto int iterate_device (const char *name);
  93
  94   int iterate_device (const char *name)
  95     {
  96       grub_size_t len;
  97       char *p;
  98       grub_file_t file;
  99
 100       len = grub_strlen (name) + 2 + grub_strlen (key) + 1;
 101       p = grub_realloc (buf, len);
 102       if (! p)
 103         return 1;
 104
 105       buf = p;
 106       grub_sprintf (buf, "(%s)%s", name, key);
 107
 108       file = grub_file_open (buf);
 109       if (file)
 110         {
 111           /* Found!  */
 112           grub_printf (" %s", name);
 113           if (count++ == 0 && var)
 114             grub_env_set (var, name);
 115
 116           grub_file_close (file);
 117         }
 118
 119       grub_errno = GRUB_ERR_NONE;
 120       return 0;
 121     }
 122
 123   grub_device_iterate (iterate_device);
 124
 125   grub_free (buf);
 126
 127   if (grub_errno == GRUB_ERR_NONE && count == 0)
 128     grub_error (GRUB_ERR_FILE_NOT_FOUND, "no such device");
 129 }
 130
 131 static grub_err_t
 132 grub_cmd_search (struct grub_arg_list *state, int argc, char **args)
 133 {
 134   const char *var = 0;
 135
 136   if (argc == 0)
 137     return grub_error (GRUB_ERR_INVALID_COMMAND, "no argument specified");
 138
 139   if (state[2].set)
 140     var = state[2].arg ? : "root";
 141
 142   if (state[1].set)
 143     search_label (args[0], var);
 144   else
 145     search_file (args[0], var);
 146
 147   return grub_errno;
 148 }
 149
 150 GRUB_MOD_INIT(search)
 151 {
 152   (void) mod;                   /* To stop warning. */
 153   grub_register_command ("search", grub_cmd_search, GRUB_COMMAND_FLAG_BOTH,
 154                          "search [-f|-l|-s] NAME",
 155                          "Search devices by a file or a filesystem label."
 156                          " If --set is specified, the first device found is"
 157                          " set to a variable. If no variable name is"
 158                          " specified, \"root\" is used.",
 159                          options);
 160 }
 161
 162 GRUB_MOD_FINI(search)
 163 {
 164   grub_unregister_command ("search");
 165 }