corecmd.c 4.35 KB
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/* corecmd.c - critical commands which are registered in kernel */
/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2009  Free Software Foundation, Inc.
 *
 *  GRUB is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  GRUB is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <grub/mm.h>
#include <grub/dl.h>
#include <grub/err.h>
#include <grub/env.h>
#include <grub/misc.h>
#include <grub/term.h>
#include <grub/file.h>
#include <grub/device.h>
#include <grub/command.h>
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#include <grub/i18n.h>
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/* set ENVVAR=VALUE */
static grub_err_t
grub_core_cmd_set (struct grub_command *cmd __attribute__ ((unused)),
		   int argc, char *argv[])
{
  char *var;
  char *val;

  if (argc < 1)
    {
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      struct grub_env_var *env;
      FOR_SORTED_ENV (env)
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	grub_printf ("%s=%s\n", env->name, grub_env_get (env->name));
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      return 0;
    }

  var = argv[0];
  val = grub_strchr (var, '=');
  if (! val)
    return grub_error (GRUB_ERR_BAD_ARGUMENT, "not an assignment");

  val[0] = 0;
  grub_env_set (var, val + 1);
  val[0] = '=';

  return 0;
}

static grub_err_t
grub_core_cmd_unset (struct grub_command *cmd __attribute__ ((unused)),
		     int argc, char *argv[])
{
  if (argc < 1)
    return grub_error (GRUB_ERR_BAD_ARGUMENT,
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		       N_("one argument expected"));
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  grub_env_unset (argv[0]);
  return 0;
}

/* insmod MODULE */
static grub_err_t
grub_core_cmd_insmod (struct grub_command *cmd __attribute__ ((unused)),
		      int argc, char *argv[])
{
  grub_dl_t mod;

  if (argc == 0)
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    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
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  if (argv[0][0] == '/' || argv[0][0] == '(' || argv[0][0] == '+')
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    mod = grub_dl_load_file (argv[0]);
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  else
    mod = grub_dl_load (argv[0]);
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  if (mod)
    grub_dl_ref (mod);

  return 0;
}

static int
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grub_mini_print_devices (const char *name, void *data __attribute__ ((unused)))
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{
  grub_printf ("(%s) ", name);

  return 0;
}

static int
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grub_mini_print_files (const char *filename,
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		       const struct grub_dirhook_info *info,
		       void *data __attribute__ ((unused)))
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{
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  grub_printf ("%s%s ", filename, info->dir ? "/" : "");
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  return 0;
}

/* ls [ARG] */
static grub_err_t
grub_core_cmd_ls (struct grub_command *cmd __attribute__ ((unused)),
		  int argc, char *argv[])
{
  if (argc < 1)
    {
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      grub_device_iterate (grub_mini_print_devices, NULL);
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      grub_xputs ("\n");
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      grub_refresh ();
    }
  else
    {
      char *device_name;
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      grub_device_t dev = 0;
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      grub_fs_t fs;
      char *path;

      device_name = grub_file_get_device_name (argv[0]);
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      if (grub_errno)
	goto fail;
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      dev = grub_device_open (device_name);
      if (! dev)
	goto fail;

      fs = grub_fs_probe (dev);
      path = grub_strchr (argv[0], ')');
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      if (! path)
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	path = argv[0];
      else
	path++;

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      if (! *path && ! device_name)
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	{
	  grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid argument");
	  goto fail;
	}

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      if (! *path)
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	{
	  if (grub_errno == GRUB_ERR_UNKNOWN_FS)
	    grub_errno = GRUB_ERR_NONE;

	  grub_printf ("(%s): Filesystem is %s.\n",
		       device_name, fs ? fs->name : "unknown");
	}
      else if (fs)
	{
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	  (fs->dir) (dev, path, grub_mini_print_files, NULL);
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	  grub_xputs ("\n");
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	  grub_refresh ();
	}

    fail:
      if (dev)
	grub_device_close (dev);

      grub_free (device_name);
    }

  return grub_errno;
}

void
grub_register_core_commands (void)
{
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  grub_command_t cmd;
  cmd = grub_register_command ("set", grub_core_cmd_set,
			       N_("[ENVVAR=VALUE]"),
			       N_("Set an environment variable."));
  if (cmd)
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    cmd->flags |= GRUB_COMMAND_FLAG_EXTRACTOR;
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  grub_register_command ("unset", grub_core_cmd_unset,
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			 N_("ENVVAR"),
			 N_("Remove an environment variable."));
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  grub_register_command ("ls", grub_core_cmd_ls,
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			 N_("[ARG]"), N_("List devices or files."));
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  grub_register_command ("insmod", grub_core_cmd_insmod,
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			 N_("MODULE"), N_("Insert a module."));
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}