grub-core/kern/corecmd.c

   1 /* corecmd.c - critical commands which are registered in kernel */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 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/mm.h>
  21 #include <grub/dl.h>
  22 #include <grub/err.h>
  23 #include <grub/env.h>
  24 #include <grub/misc.h>
  25 #include <grub/term.h>
  26 #include <grub/file.h>
  27 #include <grub/device.h>
  28 #include <grub/command.h>
  29 #include <grub/i18n.h>
  30
  31 /* set ENVVAR=VALUE */
  32 static grub_err_t
  33 grub_core_cmd_set (struct grub_command *cmd __attribute__ ((unused)),
  34                    int argc, char *argv[])
  35 {
  36   char *var;
  37   char *val;
  38
  39   if (argc < 1)
  40     {
  41       struct grub_env_var *env;
  42       FOR_SORTED_ENV (env)
  43         grub_printf ("%s=%s\n", env->name, grub_env_get (env->name));
  44       return 0;
  45     }
  46
  47   var = argv[0];
  48   val = grub_strchr (var, '=');
  49   if (! val)
  50     return grub_error (GRUB_ERR_BAD_ARGUMENT, "not an assignment");
  51
  52   val[0] = 0;
  53   grub_env_set (var, val + 1);
  54   val[0] = '=';
  55
  56   return 0;
  57 }
  58
  59 static grub_err_t
  60 grub_core_cmd_unset (struct grub_command *cmd __attribute__ ((unused)),
  61                      int argc, char *argv[])
  62 {
  63   if (argc < 1)
  64     return grub_error (GRUB_ERR_BAD_ARGUMENT,
  65                        N_("one argument expected"));
  66
  67   grub_env_unset (argv[0]);
  68   return 0;
  69 }
  70
  71 /* insmod MODULE */
  72 static grub_err_t
  73 grub_core_cmd_insmod (struct grub_command *cmd __attribute__ ((unused)),
  74                       int argc, char *argv[])
  75 {
  76   grub_dl_t mod;
  77
  78   if (argc == 0)
  79     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
  80
  81   if (argv[0][0] == '/' || argv[0][0] == '(' || argv[0][0] == '+')
  82     mod = grub_dl_load_file (argv[0]);
  83   else
  84     mod = grub_dl_load (argv[0]);
  85
  86   if (mod)
  87     grub_dl_ref (mod);
  88
  89   return 0;
  90 }
  91
  92 static int
  93 grub_mini_print_devices (const char *name, void *data __attribute__ ((unused)))
  94 {
  95   grub_printf ("(%s) ", name);
  96
  97   return 0;
  98 }
  99
 100 static int
 101 grub_mini_print_files (const char *filename,
 102                        const struct grub_dirhook_info *info,
 103                        void *data __attribute__ ((unused)))
 104 {
 105   grub_printf ("%s%s ", filename, info->dir ? "/" : "");
 106
 107   return 0;
 108 }
 109
 110 /* ls [ARG] */
 111 static grub_err_t
 112 grub_core_cmd_ls (struct grub_command *cmd __attribute__ ((unused)),
 113                   int argc, char *argv[])
 114 {
 115   if (argc < 1)
 116     {
 117       grub_device_iterate (grub_mini_print_devices, NULL);
 118       grub_xputs ("\n");
 119       grub_refresh ();
 120     }
 121   else
 122     {
 123       char *device_name;
 124       grub_device_t dev = 0;
 125       grub_fs_t fs;
 126       char *path;
 127
 128       device_name = grub_file_get_device_name (argv[0]);
 129       if (grub_errno)
 130         goto fail;
 131       dev = grub_device_open (device_name);
 132       if (! dev)
 133         goto fail;
 134
 135       fs = grub_fs_probe (dev);
 136       path = grub_strchr (argv[0], ')');
 137       if (! path)
 138         path = argv[0];
 139       else
 140         path++;
 141
 142       if (! *path && ! device_name)
 143         {
 144           grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid argument");
 145           goto fail;
 146         }
 147
 148       if (! *path)
 149         {
 150           if (grub_errno == GRUB_ERR_UNKNOWN_FS)
 151             grub_errno = GRUB_ERR_NONE;
 152
 153           grub_printf ("(%s): Filesystem is %s.\n",
 154                        device_name, fs ? fs->name : "unknown");
 155         }
 156       else if (fs)
 157         {
 158           (fs->fs_dir) (dev, path, grub_mini_print_files, NULL);
 159           grub_xputs ("\n");
 160           grub_refresh ();
 161         }
 162
 163     fail:
 164       if (dev)
 165         grub_device_close (dev);
 166
 167       grub_free (device_name);
 168     }
 169
 170   return grub_errno;
 171 }
 172
 173 void
 174 grub_register_core_commands (void)
 175 {
 176   grub_command_t cmd;
 177   cmd = grub_register_command ("set", grub_core_cmd_set,
 178                                N_("[ENVVAR=VALUE]"),
 179                                N_("Set an environment variable."));
 180   if (cmd)
 181     cmd->flags |= GRUB_COMMAND_FLAG_EXTRACTOR;
 182   grub_register_command ("unset", grub_core_cmd_unset,
 183                          N_("ENVVAR"),
 184                          N_("Remove an environment variable."));
 185   grub_register_command ("ls", grub_core_cmd_ls,
 186                          N_("[ARG]"), N_("List devices or files."));
 187   grub_register_command ("insmod", grub_core_cmd_insmod,
 188                          N_("MODULE"), N_("Insert a module."));
 189 }