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) 2005,2007,2008,2009  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/device.h>
  26 #include <grub/file.h>
  27 #include <grub/env.h>
  28 #include <grub/command.h>
  29 #include <grub/search.h>
  30 #include <grub/i18n.h>
  31
  32 void
  33 FUNC_NAME (const char *key, const char *var, int no_floppy)
  34 {
  35   int count = 0;
  36   grub_fs_autoload_hook_t saved_autoload;
  37
  38   auto int iterate_device (const char *name);
  39   int iterate_device (const char *name)
  40   {
  41     int found = 0;
  42
  43     /* Skip floppy drives when requested.  */
  44     if (no_floppy &&
  45         name[0] == 'f' && name[1] == 'd' && name[2] >= '0' && name[2] <= '9')
  46       return 0;
  47
  48 #ifdef DO_SEARCH_FILE
  49       {
  50         char *buf;
  51         grub_file_t file;
  52
  53         buf = grub_xasprintf ("(%s)%s", name, key);
  54         if (! buf)
  55           return 1;
  56
  57         file = grub_file_open (buf);
  58         if (file)
  59           {
  60             found = 1;
  61             grub_file_close (file);
  62           }
  63         grub_free (buf);
  64       }
  65 #else
  66       {
  67         /* SEARCH_FS_UUID or SEARCH_LABEL */
  68         grub_device_t dev;
  69         grub_fs_t fs;
  70         char *quid;
  71
  72         dev = grub_device_open (name);
  73         if (dev)
  74           {
  75             fs = grub_fs_probe (dev);
  76
  77 #ifdef DO_SEARCH_FS_UUID
  78 #define compare_fn grub_strcasecmp
  79 #define read_fn uuid
  80 #else
  81 #define compare_fn grub_strcmp
  82 #define read_fn label
  83 #endif
  84
  85             if (fs && fs->read_fn)
  86               {
  87                 fs->read_fn (dev, &quid);
  88
  89                 if (grub_errno == GRUB_ERR_NONE && quid)
  90                   {
  91                     if (compare_fn (quid, key) == 0)
  92                       found = 1;
  93
  94                     grub_free (quid);
  95                   }
  96               }
  97
  98             grub_device_close (dev);
  99           }
 100       }
 101 #endif
 102
 103     if (found)
 104       {
 105         count++;
 106         if (var)
 107           grub_env_set (var, name);
 108         else
 109           grub_printf (" %s", name);
 110       }
 111
 112     grub_errno = GRUB_ERR_NONE;
 113     return (found && var);
 114   }
 115
 116   /* First try without autoloading if we're setting variable. */
 117   if (var)
 118     {
 119       saved_autoload = grub_fs_autoload_hook;
 120       grub_fs_autoload_hook = 0;
 121       grub_device_iterate (iterate_device);
 122
 123       /* Restore autoload hook.  */
 124       grub_fs_autoload_hook = saved_autoload;
 125
 126       /* Retry with autoload if nothing found.  */
 127       if (grub_errno == GRUB_ERR_NONE && count == 0)
 128         grub_device_iterate (iterate_device);
 129     }
 130   else
 131     grub_device_iterate (iterate_device);
 132
 133   if (grub_errno == GRUB_ERR_NONE && count == 0)
 134     grub_error (GRUB_ERR_FILE_NOT_FOUND, "no such device: %s", key);
 135 }
 136
 137 static grub_err_t
 138 grub_cmd_do_search (grub_command_t cmd __attribute__ ((unused)), int argc,
 139                     char **args)
 140 {
 141   if (argc == 0)
 142     return grub_error (GRUB_ERR_BAD_ARGUMENT, "no argument specified");
 143
 144   FUNC_NAME (args[0], argc == 1 ? 0 : args[1], 0);
 145
 146   return grub_errno;
 147 }
 148
 149 static grub_command_t cmd;
 150
 151 #ifdef DO_SEARCH_FILE
 152 GRUB_MOD_INIT(search_fs_file)
 153 #elif defined (DO_SEARCH_FS_UUID)
 154 GRUB_MOD_INIT(search_fs_uuid)
 155 #else
 156 GRUB_MOD_INIT(search_label)
 157 #endif
 158 {
 159   cmd =
 160     grub_register_command (COMMAND_NAME, grub_cmd_do_search,
 161                            N_("NAME [VARIABLE]"),
 162                            HELP_MESSAGE);
 163 }
 164
 165 #ifdef DO_SEARCH_FILE
 166 GRUB_MOD_FINI(search_fs_file)
 167 #elif defined (DO_SEARCH_FS_UUID)
 168 GRUB_MOD_FINI(search_fs_uuid)
 169 #else
 170 GRUB_MOD_FINI(search_label)
 171 #endif
 172 {
 173   grub_unregister_command (cmd);
 174 }