/* search.c - search devices based on a file or a filesystem label */
/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2005,2007,2008,2009  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/types.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/err.h>
#include <grub/dl.h>
#include <grub/device.h>
#include <grub/file.h>
#include <grub/env.h>
#include <grub/command.h>
#include <grub/search.h>
#include <grub/i18n.h>

#ifdef DO_SEARCH_FILE
GRUB_EXPORT(grub_search_fs_file);
#elif defined (DO_SEARCH_FS_UUID)
GRUB_EXPORT(grub_search_fs_uuid);
#else
GRUB_EXPORT(grub_search_label);
#endif

struct search_fs_closure
{
  const char *key;
  const char *var;
  int no_floppy;
  int count;
};

static int
iterate_device (const char *name, void *closure)
{
  struct search_fs_closure *c = closure;
  int found = 0;

  /* Skip floppy drives when requested.  */
  if (c->no_floppy &&
      name[0] == 'f' && name[1] == 'd' && name[2] >= '0' && name[2] <= '9')
    return 0;

#ifdef DO_SEARCH_FILE
  {
    char *buf;
    grub_file_t file;

    buf = grub_xasprintf ("(%s)%s", name, c->key);
    if (! buf)
      return 1;

    file = grub_file_open (buf);
    if (file)
      {
	found = 1;
	grub_file_close (file);
      }
    grub_free (buf);
  }
#else
  {
    /* SEARCH_FS_UUID or SEARCH_LABEL */
    grub_device_t dev;
    grub_fs_t fs;
    char *quid;

    dev = grub_device_open (name);
    if (dev)
      {
	fs = grub_fs_probe (dev);

#ifdef DO_SEARCH_FS_UUID
#define compare_fn grub_strcasecmp
#define read_fn uuid
#else
#define compare_fn grub_strcmp
#define read_fn label
#endif

	if (fs && fs->read_fn)
	  {
	    fs->read_fn (dev, &quid);

	    if (grub_errno == GRUB_ERR_NONE && quid)
	      {
		if (compare_fn (quid, c->key) == 0)
		  found = 1;

		grub_free (quid);
	      }
	  }

	grub_device_close (dev);
      }
  }
#endif

  if (found)
    {
      c->count++;
      if (c->var)
	grub_env_set (c->var, name);
      else
	grub_printf (" %s", name);
    }

  grub_errno = GRUB_ERR_NONE;
  return (found && c->var);
}

void
FUNC_NAME (const char *key, const char *var, int no_floppy)
{
  struct search_fs_closure c;

  c.key = key;
  c.var = var;
  c.no_floppy = no_floppy;
  c.count = 0;

  /* First try without autoloading if we're setting variable. */
  if (c.var)
    {
      grub_fs_autoload_hook_t saved_autoload;

      saved_autoload = grub_fs_autoload_hook;
      grub_fs_autoload_hook = 0;
      grub_device_iterate (iterate_device, &c);

      /* Restore autoload hook.  */
      grub_fs_autoload_hook = saved_autoload;

      /* Retry with autoload if nothing found.  */
      if (grub_errno == GRUB_ERR_NONE && c.count == 0)
	grub_device_iterate (iterate_device, &c);
    }
  else
    grub_device_iterate (iterate_device, &c);

  if (grub_errno == GRUB_ERR_NONE && c.count == 0)
    grub_error (GRUB_ERR_FILE_NOT_FOUND, "no such device: %s", key);
}

static grub_err_t
grub_cmd_do_search (grub_command_t cmd __attribute__ ((unused)), int argc,
		    char **args)
{
  if (argc == 0)
    return grub_error (GRUB_ERR_BAD_ARGUMENT, "no argument specified");

  FUNC_NAME (args[0], argc == 1 ? 0 : args[1], 0);

  return grub_errno;
}

static grub_command_t cmd;

#ifdef DO_SEARCH_FILE
GRUB_MOD_INIT(search_file)
#elif defined (DO_SEARCH_FS_UUID)
GRUB_MOD_INIT(search_fs_uuid)
#else
GRUB_MOD_INIT(search_fs_label)
#endif
{
  cmd =
    grub_register_command (COMMAND_NAME, grub_cmd_do_search,
			   N_("NAME [VARIABLE]"),
			   HELP_MESSAGE);
}

#ifdef DO_SEARCH_FILE
GRUB_MOD_FINI(search_file)
#elif defined (DO_SEARCH_FS_UUID)
GRUB_MOD_FINI(search_fs_uuid)
#else
GRUB_MOD_FINI(search_fs_label)
#endif
{
  grub_unregister_command (cmd);
}
