File: getroot.c

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/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 1999,2000,2001,2002,2003,2006,2007,2008,2009,2010,2011,2012,2013  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 <config-util.h>
#include <config.h>

#include <sys/stat.h>
#include <sys/types.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#include <error.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif

#include <grub/types.h>

#include <grub/util/misc.h>

#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/emu/misc.h>
#include <grub/emu/hostdisk.h>
#include <grub/emu/getroot.h>

#include <sys/wait.h>

# include <sys/types.h>
# include <sys/mkdev.h>
# include <sys/dkio.h>


char *
grub_util_part_to_disk (const char *os_dev,
			struct stat *st,
			int *is_part)
{
  char *colon = grub_strrchr (os_dev, ':');

  if (! S_ISCHR (st->st_mode))
    {
      *is_part = 0;
      return xstrdup (os_dev);
    }

  if (grub_memcmp (os_dev, "/devices", sizeof ("/devices") - 1) == 0
      && colon)
    {
      char *ret = xmalloc (colon - os_dev + sizeof (":q,raw"));
      if (grub_strcmp (colon, ":q,raw") != 0)
	*is_part = 1;
      grub_memcpy (ret, os_dev, colon - os_dev);
      grub_memcpy (ret + (colon - os_dev), ":q,raw", sizeof (":q,raw"));
      return ret;
    }
  else
    return xstrdup (os_dev);
}

enum grub_dev_abstraction_types
grub_util_get_dev_abstraction_os (const char *os_dev __attribute__((unused)))
{
  return GRUB_DEV_ABSTRACTION_NONE;
}

int
grub_util_pull_device_os (const char *os_dev __attribute__ ((unused)),
			  enum grub_dev_abstraction_types ab __attribute__ ((unused)))
{
  return 0;
}

char *
grub_util_get_grub_dev_os (const char *os_dev __attribute__ ((unused)))
{
  return NULL;
}

grub_disk_addr_t
grub_util_find_partition_start_os (const char *dev)
{
  int fd;
  struct extpart_info pinfo;

  fd = open (dev, O_RDONLY);
  if (fd == -1)
    {
      grub_error (GRUB_ERR_BAD_DEVICE, N_("cannot open `%s': %s"),
		  dev, strerror (errno));
      return 0;
    }

  if (ioctl (fd, DKIOCEXTPARTINFO, &pinfo))
    {
      grub_error (GRUB_ERR_BAD_DEVICE,
		  "cannot get disk geometry of `%s'", dev);
      close (fd);
      return 0;
    }

  close (fd);

  return pinfo.p_start;
}