grub/util/grub-setup.c

/* grub-setup.c - make GRUB usable */
/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011  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.h>
#include <grub/types.h>
#include <grub/emu/misc.h>
#include <grub/util/misc.h>
#include <grub/device.h>
#include <grub/disk.h>
#include <grub/file.h>
#include <grub/fs.h>
#include <grub/partition.h>
#include <grub/env.h>
#include <grub/emu/hostdisk.h>
#include <grub/term.h>
#include <grub/i18n.h>
#include <grub/util/lvm.h>
#ifdef GRUB_SETUP_SPARC64
#include <grub/util/ofpath.h>
#include <grub/sparc64/ieee1275/boot.h>
#include <grub/sparc64/ieee1275/kernel.h>
#else
#include <grub/i386/pc/boot.h>
#include <grub/i386/pc/kernel.h>
#endif

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <assert.h>
#include <grub/emu/getroot.h>
#include "progname.h"
#include <grub/reed_solomon.h>
#include <grub/msdos_partition.h>
#include <include/grub/crypto.h>

#define _GNU_SOURCE	1
#include <argp.h>

/* On SPARC this program fills in various fields inside of the 'boot' and 'core'
 * image files.
 *
 * The 'boot' image needs to know the OBP path name of the root
 * device.  It also needs to know the initial block number of
 * 'core' (which is 'diskboot' concatenated with 'kernel' and
 * all the modules, this is created by grub-mkimage).  This resulting
 * 'boot' image is 512 bytes in size and is placed in the second block
 * of a partition.
 *
 * The initial 'diskboot' block acts as a loader for the actual GRUB
 * kernel.  It contains the loading code and then a block list.
 *
 * The block list of 'core' starts at the end of the 'diskboot' image
 * and works it's way backwards towards the end of the code of 'diskboot'.
 *
 * We patch up the images with the necessary values and write out the
 * result.
 */

#define DEFAULT_BOOT_FILE	"boot.img"
#define DEFAULT_CORE_FILE	"core.img"

#ifdef GRUB_SETUP_SPARC64
#define grub_target_to_host16(x)	grub_be_to_cpu16(x)
#define grub_target_to_host32(x)	grub_be_to_cpu32(x)
#define grub_target_to_host64(x)	grub_be_to_cpu64(x)
#define grub_host_to_target16(x)	grub_cpu_to_be16(x)
#define grub_host_to_target32(x)	grub_cpu_to_be32(x)
#define grub_host_to_target64(x)	grub_cpu_to_be64(x)
#elif defined (GRUB_SETUP_BIOS)
#define grub_target_to_host16(x)	grub_le_to_cpu16(x)
#define grub_target_to_host32(x)	grub_le_to_cpu32(x)
#define grub_target_to_host64(x)	grub_le_to_cpu64(x)
#define grub_host_to_target16(x)	grub_cpu_to_le16(x)
#define grub_host_to_target32(x)	grub_cpu_to_le32(x)
#define grub_host_to_target64(x)	grub_cpu_to_le64(x)
#else
#error Complete this
#endif

static void
write_rootdev (char *core_img, grub_device_t root_dev,
	       char *boot_img, grub_uint64_t first_sector)
{
#ifdef GRUB_SETUP_BIOS
  {
    grub_uint8_t *boot_drive;
    grub_disk_addr_t *kernel_sector;
    boot_drive = (grub_uint8_t *) (boot_img + GRUB_BOOT_MACHINE_BOOT_DRIVE);
    kernel_sector = (grub_disk_addr_t *) (boot_img
					  + GRUB_BOOT_MACHINE_KERNEL_SECTOR);

    /* FIXME: can this be skipped?  */
    *boot_drive = 0xFF;

    *kernel_sector = grub_cpu_to_le64 (first_sector);
  }
#endif
#ifdef GRUB_SETUP_SPARC64
  {
    grub_disk_addr_t *kernel_byte;
    kernel_byte = (grub_disk_addr_t *) (boot_img
					+ GRUB_BOOT_AOUT_HEADER_SIZE
					+ GRUB_BOOT_MACHINE_KERNEL_BYTE);
    *kernel_byte = grub_cpu_to_be64 (first_sector << GRUB_DISK_SECTOR_BITS);
  }
#endif
}

#ifdef GRUB_SETUP_SPARC64
#define BOOT_SECTOR 1
#else
#define BOOT_SECTOR 0
#endif

static void
setup (const char *dir,
       const char *boot_file, const char *core_file,
       const char *dest, int force,
       int fs_probe, int allow_floppy)
{
  char *boot_path, *core_path, *core_path_dev, *core_path_dev_full;
  char *boot_img, *core_img;
  char *root = 0;
  size_t boot_size, core_size;
  grub_uint16_t core_sectors;
  grub_device_t root_dev = 0, dest_dev;
  struct grub_boot_blocklist *first_block, *block;
  char *tmp_img;
  grub_disk_addr_t first_sector;
#ifdef GRUB_SETUP_BIOS
  grub_uint16_t current_segment
    = GRUB_BOOT_I386_PC_KERNEL_SEG + (GRUB_DISK_SECTOR_SIZE >> 4);
#endif
  grub_uint16_t last_length = GRUB_DISK_SECTOR_SIZE;
  grub_file_t file;
  FILE *fp;

  auto void NESTED_FUNC_ATTR save_first_sector (grub_disk_addr_t sector,
						unsigned offset,
						unsigned length);
  auto void NESTED_FUNC_ATTR save_blocklists (grub_disk_addr_t sector,
					      unsigned offset,
					      unsigned length);

  void NESTED_FUNC_ATTR save_first_sector (grub_disk_addr_t sector,
					   unsigned offset,
					   unsigned length)
    {
      grub_util_info ("the first sector is <%" PRIuGRUB_UINT64_T ",%u,%u>",
		      sector, offset, length);

      if (offset != 0 || length != GRUB_DISK_SECTOR_SIZE)
	grub_util_error ("%s", _("the first sector of the core file is not sector-aligned"));

      first_sector = sector;
    }

  void NESTED_FUNC_ATTR save_blocklists (grub_disk_addr_t sector,
					 unsigned offset,
					 unsigned length)
    {
      struct grub_boot_blocklist *prev = block + 1;

      grub_util_info ("saving <%" PRIuGRUB_UINT64_T ",%u,%u>",
		      sector, offset, length);

      if (offset != 0 || last_length != GRUB_DISK_SECTOR_SIZE)
	grub_util_error ("%s", _("non-sector-aligned data is found in the core file"));

      if (block != first_block
	  && (grub_target_to_host64 (prev->start)
	      + grub_target_to_host16 (prev->len)) == sector)
	{
	  grub_uint16_t t = grub_target_to_host16 (prev->len) + 1;
	  prev->len = grub_host_to_target16 (t);
	}
      else
	{
	  block->start = grub_host_to_target64 (sector);
	  block->len = grub_host_to_target16 (1);
#ifdef GRUB_SETUP_BIOS
	  block->segment = grub_host_to_target16 (current_segment);
#endif

	  block--;
	  if (block->len)
	    grub_util_error ("%s", _("the sectors of the core file are too fragmented"));
	}

      last_length = length;
#ifdef GRUB_SETUP_BIOS
      current_segment += GRUB_DISK_SECTOR_SIZE >> 4;
#endif
    }

  /* Read the boot image by the OS service.  */
  boot_path = grub_util_get_path (dir, boot_file);
  boot_size = grub_util_get_image_size (boot_path);
  if (boot_size != GRUB_DISK_SECTOR_SIZE)
    grub_util_error (_("the size of `%s' is not %u"),
		     boot_path, GRUB_DISK_SECTOR_SIZE);
  boot_img = grub_util_read_image (boot_path);
  free (boot_path);

  core_path = grub_util_get_path (dir, core_file);
  core_size = grub_util_get_image_size (core_path);
  core_sectors = ((core_size + GRUB_DISK_SECTOR_SIZE - 1)
		  >> GRUB_DISK_SECTOR_BITS);
  if (core_size < GRUB_DISK_SECTOR_SIZE)
    grub_util_error (_("the size of `%s' is too small"), core_path);
#ifdef GRUB_SETUP_BIOS
  if (core_size > 0xFFFF * GRUB_DISK_SECTOR_SIZE)
    grub_util_error (_("the size of `%s' is too large"), core_path);
#endif

  core_img = grub_util_read_image (core_path);

  /* Have FIRST_BLOCK to point to the first blocklist.  */
  first_block = (struct grub_boot_blocklist *) (core_img
						+ GRUB_DISK_SECTOR_SIZE
						- sizeof (*block));
  grub_util_info ("root is `%s', dest is `%s'", root, dest);

  grub_util_info ("Opening dest");
  dest_dev = grub_device_open (dest);
  if (! dest_dev)
    grub_util_error ("%s", grub_errmsg);

  {
    char **root_devices = grub_guess_root_devices (dir);
    char **cur;
    int found = 0;

    for (cur = root_devices; *cur; cur++)
      {
	char *drive;
	grub_device_t try_dev;

	drive = grub_util_get_grub_dev (*cur);
	if (!drive)
	  continue;
	try_dev = grub_device_open (drive);
	if (! try_dev)
	  continue;
	if (!found && try_dev->disk->id == dest_dev->disk->id
	    && try_dev->disk->dev->id == dest_dev->disk->dev->id)
	  {
	    if (root_dev)
	      grub_device_close (root_dev);
	    free (root);
	    root_dev = try_dev;
	    root = drive;
	    found = 1;
	    continue;
	  }
	if (!root_dev)
	  {
	    root_dev = try_dev;
	    root = drive;
	    continue;
	  }
	grub_device_close (try_dev);	
	free (drive);
      }
    if (!root_dev)
      {
	grub_util_error ("guessing the root device failed, because of `%s'",
			 grub_errmsg);
      }
    grub_util_info ("guessed root_dev `%s' from "
		    "dir `%s'", root_dev->disk->name, dir);
  }

  grub_util_info ("setting the root device to `%s'", root);
  if (grub_env_set ("root", root) != GRUB_ERR_NONE)
    grub_util_error ("%s", grub_errmsg);

#ifdef GRUB_SETUP_BIOS
  /* Read the original sector from the disk.  */
  tmp_img = xmalloc (GRUB_DISK_SECTOR_SIZE);
  if (grub_disk_read (dest_dev->disk, 0, 0, GRUB_DISK_SECTOR_SIZE, tmp_img))
    grub_util_error ("%s", grub_errmsg);
#endif

#ifdef GRUB_SETUP_BIOS
  {
    grub_uint16_t *boot_drive_check;
    boot_drive_check = (grub_uint16_t *) (boot_img
					  + GRUB_BOOT_MACHINE_DRIVE_CHECK);
    /* Copy the possible DOS BPB.  */
    memcpy (boot_img + GRUB_BOOT_MACHINE_BPB_START,
	    tmp_img + GRUB_BOOT_MACHINE_BPB_START,
	    GRUB_BOOT_MACHINE_BPB_END - GRUB_BOOT_MACHINE_BPB_START);

    /* If DEST_DRIVE is a hard disk, enable the workaround, which is
       for buggy BIOSes which don't pass boot drive correctly. Instead,
       they pass 0x00 or 0x01 even when booted from 0x80.  */
    if (!allow_floppy && !grub_util_biosdisk_is_floppy (dest_dev->disk))
      /* Replace the jmp (2 bytes) with double nop's.  */
      *boot_drive_check = 0x9090;
  }
#endif

#ifdef GRUB_SETUP_BIOS
  {
    grub_partition_map_t dest_partmap = NULL;
    grub_partition_t container = dest_dev->disk->partition;
    int multiple_partmaps = 0;
    int is_ldm;
    grub_err_t err;
    grub_disk_addr_t *sectors;
    int i;
    grub_fs_t fs;
    unsigned int nsec;

    /* Unlike root_dev, with dest_dev we're interested in the partition map even
       if dest_dev itself is a whole disk.  */
    auto int NESTED_FUNC_ATTR identify_partmap (grub_disk_t disk,
						const grub_partition_t p);
    int NESTED_FUNC_ATTR identify_partmap (grub_disk_t disk __attribute__ ((unused)),
					   const grub_partition_t p)
    {
      if (p->parent != container)
	return 0;
      /* NetBSD and OpenBSD subpartitions have metadata inside a partition,
	 so they are safe to ignore.
       */
      if (grub_strcmp (p->partmap->name, "netbsd") == 0
	  || grub_strcmp (p->partmap->name, "openbsd") == 0)
	return 0;
      if (dest_partmap == NULL)
	{
	  dest_partmap = p->partmap;
	  return 0;
	}
      if (dest_partmap == p->partmap)
	return 0;
      multiple_partmaps = 1;
      return 1;
    }

    grub_partition_iterate (dest_dev->disk, identify_partmap);

    if (container && grub_strcmp (container->partmap->name, "msdos") == 0
	&& dest_partmap
	&& (container->msdostype == GRUB_PC_PARTITION_TYPE_NETBSD
	    || container->msdostype == GRUB_PC_PARTITION_TYPE_OPENBSD))
      {
	grub_util_warn ("%s", _("Attempting to install GRUB to a disk with multiple partition labels or both partition label and filesystem.  This is not supported yet."));
	goto unable_to_embed;
      }

    fs = grub_fs_probe (dest_dev);
    if (!fs)
      grub_errno = GRUB_ERR_NONE;

    is_ldm = grub_util_is_ldm (dest_dev->disk);

#ifdef GRUB_SETUP_BIOS
    if (fs_probe)
      {
	if (!fs && !dest_partmap)
	  grub_util_error (_("unable to identify a filesystem in %s; safety check can't be performed"),
			   dest_dev->disk->name);
	if (fs && !fs->reserved_first_sector)
	  /* TRANSLATORS: Filesystem may reserve the space just GRUB isn't sure about it.  */
	  grub_util_error (_("%s appears to contain a %s filesystem which isn't known to "
			     "reserve space for DOS-style boot.  Installing GRUB there could "
			     "result in FILESYSTEM DESTRUCTION if valuable data is overwritten "
			     "by grub-setup (--skip-fs-probe disables this "
			     "check, use at your own risk)"), dest_dev->disk->name, fs->name);

	if (dest_partmap && strcmp (dest_partmap->name, "msdos") != 0
	    && strcmp (dest_partmap->name, "gpt") != 0
	    && strcmp (dest_partmap->name, "bsd") != 0
	    && strcmp (dest_partmap->name, "netbsd") != 0
	    && strcmp (dest_partmap->name, "openbsd") != 0
	    && strcmp (dest_partmap->name, "sunpc") != 0)
	  /* TRANSLATORS: Partition map may reserve the space just GRUB isn't sure about it.  */
	  grub_util_error (_("%s appears to contain a %s partition map which isn't known to "
			     "reserve space for DOS-style boot.  Installing GRUB there could "
			     "result in FILESYSTEM DESTRUCTION if valuable data is overwritten "
			     "by grub-setup (--skip-fs-probe disables this "
			     "check, use at your own risk)"), dest_dev->disk->name, dest_partmap->name);
	if (is_ldm && dest_partmap && strcmp (dest_partmap->name, "msdos") != 0
	    && strcmp (dest_partmap->name, "gpt") != 0)
	  grub_util_error (_("%s appears to contain a %s partition map and "
			     "LDM which isn't known to be a safe combination."
			     "  Installing GRUB there could "
			     "result in FILESYSTEM DESTRUCTION if valuable data"
			     " is overwritten "
			     "by grub-setup (--skip-fs-probe disables this "
			     "check, use at your own risk)"),
			   dest_dev->disk->name, dest_partmap->name);

      }
#endif

    /* Copy the partition table.  */
    if (dest_partmap ||
        (!allow_floppy && !grub_util_biosdisk_is_floppy (dest_dev->disk)))
      memcpy (boot_img + GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC,
	      tmp_img + GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC,
	      GRUB_BOOT_MACHINE_PART_END - GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC);

    free (tmp_img);
    
    if (! dest_partmap && ! fs && !is_ldm)
      {
	grub_util_warn ("%s", _("Attempting to install GRUB to a partitionless disk or to a partition.  This is a BAD idea."));
	goto unable_to_embed;
      }
    if (multiple_partmaps || (dest_partmap && fs) || (is_ldm && fs))
      {
	grub_util_warn ("%s", _("Attempting to install GRUB to a disk with multiple partition labels.  This is not supported yet."));
	goto unable_to_embed;
      }

    if (dest_partmap && !dest_partmap->embed)
      {
	grub_util_warn (_("Partition style '%s' doesn't support embedding"),
			dest_partmap->name);
	goto unable_to_embed;
      }

    if (fs && !fs->embed)
      {
	grub_util_warn (_("File system '%s' doesn't support embedding"),
			fs->name);
	goto unable_to_embed;
      }

    nsec = core_sectors;
    if (is_ldm)
      err = grub_util_ldm_embed (dest_dev->disk, &nsec,
				 GRUB_EMBED_PCBIOS, &sectors);
    else if (dest_partmap)
      err = dest_partmap->embed (dest_dev->disk, &nsec,
				 GRUB_EMBED_PCBIOS, &sectors);
    else
      err = fs->embed (dest_dev, &nsec,
		       GRUB_EMBED_PCBIOS, &sectors);
    if (!err && nsec < core_sectors)
      {
	err = grub_error (GRUB_ERR_OUT_OF_RANGE,
			  N_("Your embedding area is unusually small.  "
			     "core.img won't fit in it."));
      }
    
    if (err)
      {
	grub_util_warn ("%s", grub_errmsg);
	grub_errno = GRUB_ERR_NONE;
	goto unable_to_embed;
      }

    if (nsec > 2 * core_sectors)
      nsec = 2 * core_sectors;
    if (nsec > ((0x78000 - GRUB_KERNEL_I386_PC_LINK_ADDR)
		>> GRUB_DISK_SECTOR_BITS))
      nsec = ((0x78000 - GRUB_KERNEL_I386_PC_LINK_ADDR)
	      >> GRUB_DISK_SECTOR_BITS);

    /* Clean out the blocklists.  */
    block = first_block;
    while (block->len)
      {
	grub_memset (block, 0, sizeof (block));
      
	block--;

	if ((char *) block <= core_img)
	  grub_util_error ("%s", _("no terminator in the core image"));
      }

    save_first_sector (sectors[0] + grub_partition_get_start (container),
		       0, GRUB_DISK_SECTOR_SIZE);

    block = first_block;
    for (i = 1; i < nsec; i++)
      save_blocklists (sectors[i] + grub_partition_get_start (container),
		       0, GRUB_DISK_SECTOR_SIZE);

    write_rootdev (core_img, root_dev, boot_img, first_sector);

    core_img = realloc (core_img, nsec * GRUB_DISK_SECTOR_SIZE);
    first_block = (struct grub_boot_blocklist *) (core_img
						  + GRUB_DISK_SECTOR_SIZE
						  - sizeof (*block));

    grub_size_t no_rs_length;
    *(grub_uint32_t *) (core_img + GRUB_DISK_SECTOR_SIZE
			+ GRUB_KERNEL_I386_PC_REED_SOLOMON_REDUNDANCY)
      = grub_host_to_target32 (nsec * GRUB_DISK_SECTOR_SIZE - core_size);
    no_rs_length = grub_target_to_host16 
      (*(grub_uint16_t *) (core_img
			   + GRUB_DISK_SECTOR_SIZE
			   + GRUB_KERNEL_I386_PC_NO_REED_SOLOMON_LENGTH));

    if (no_rs_length == 0xffff)
      grub_util_error ("%s", _("core.img version mismatch"));

    void *tmp = xmalloc (core_size);
    grub_memcpy (tmp, core_img, core_size);
    grub_reed_solomon_add_redundancy (core_img + no_rs_length + GRUB_DISK_SECTOR_SIZE,
				      core_size - no_rs_length - GRUB_DISK_SECTOR_SIZE,
				      nsec * GRUB_DISK_SECTOR_SIZE
				      - core_size);
    assert (grub_memcmp (tmp, core_img, core_size) == 0);
    free (tmp);

    /* Make sure that the second blocklist is a terminator.  */
    block = first_block - 1;
    block->start = 0;
    block->len = 0;
    block->segment = 0;

    /* Write the core image onto the disk.  */
    for (i = 0; i < nsec; i++)
      grub_disk_write (dest_dev->disk, sectors[i], 0,
		       GRUB_DISK_SECTOR_SIZE,
		       core_img + i * GRUB_DISK_SECTOR_SIZE);

    grub_free (sectors);

    goto finish;
  }

unable_to_embed:
#endif

  if (dest_dev->disk->dev->id != root_dev->disk->dev->id)
    grub_util_error ("%s", _("embedding is not possible, but this is required for "
			     "RAID and LVM install"));

#ifdef GRUB_SETUP_BIOS
  if (dest_dev->disk->id != root_dev->disk->id
      || dest_dev->disk->dev->id != root_dev->disk->dev->id)
    /* TRANSLATORS: cross-disk refers to /boot being on one disk
       but MBR on another.  */
    grub_util_error ("%s", _("embedding is not possible, but this is required for "
			     "cross-disk install"));
#endif

  grub_util_warn ("%s", _("Embedding is not possible.  GRUB can only be installed in this "
			  "setup by using blocklists.  However, blocklists are UNRELIABLE and "
			  "their use is discouraged."));
  if (! force)
    grub_util_error ("%s", _("will not proceed with blocklists"));

  /* The core image must be put on a filesystem unfortunately.  */
  grub_util_info ("will leave the core image on the filesystem");

  /* Make sure that GRUB reads the identical image as the OS.  */
  tmp_img = xmalloc (core_size);
  core_path_dev_full = grub_util_get_path (dir, core_file);
  core_path_dev = grub_make_system_path_relative_to_its_root (core_path_dev_full);
  free (core_path_dev_full);

  grub_util_biosdisk_flush (root_dev->disk);

#define MAX_TRIES	5
  {
    int i;
    for (i = 0; i < MAX_TRIES; i++)
      {
	grub_util_info ((i == 0) ? _("attempting to read the core image `%s' from GRUB")
			: _("attempting to read the core image `%s' from GRUB again"),
			core_path_dev);

	grub_disk_cache_invalidate_all ();

	grub_file_filter_disable_compression ();
	file = grub_file_open (core_path_dev);
	if (file)
	  {
	    if (grub_file_size (file) != core_size)
	      grub_util_info ("succeeded in opening the core image but the size is different (%d != %d)",
			      (int) grub_file_size (file), (int) core_size);
	    else if (grub_file_read (file, tmp_img, core_size)
		     != (grub_ssize_t) core_size)
	      grub_util_info ("succeeded in opening the core image but cannot read %d bytes",
			      (int) core_size);
	    else if (memcmp (core_img, tmp_img, core_size) != 0)
	      {
#if 0
		FILE *dump;
		FILE *dump2;

		dump = fopen ("dump.img", "wb");
		if (dump)
		  {
		    fwrite (tmp_img, 1, core_size, dump);
		    fclose (dump);
		  }

		dump2 = fopen ("dump2.img", "wb");
		if (dump2)
		  {
		    fwrite (core_img, 1, core_size, dump2);
		    fclose (dump2);
		  }

#endif
		grub_util_info ("succeeded in opening the core image but the data is different");
	      }
	    else
	      {
		grub_file_close (file);
		break;
	      }

	    grub_file_close (file);
	  }
	else
	  grub_util_info ("couldn't open the core image");

	if (grub_errno)
	  grub_util_info ("error message = %s", grub_errmsg);

	grub_errno = GRUB_ERR_NONE;
	grub_util_biosdisk_flush (root_dev->disk);
	sleep (1);
      }

    if (i == MAX_TRIES)
      grub_util_error (_("cannot read `%s' correctly"), core_path_dev);
  }

  /* Clean out the blocklists.  */
  block = first_block;
  while (block->len)
    {
      block->start = 0;
      block->len = 0;
#ifdef GRUB_SETUP_BIOS
      block->segment = 0;
#endif

      block--;

      if ((char *) block <= core_img)
	grub_util_error ("%s", _("no terminator in the core image"));
    }

  /* Now read the core image to determine where the sectors are.  */
  grub_file_filter_disable_compression ();
  file = grub_file_open (core_path_dev);
  if (! file)
    grub_util_error ("%s", grub_errmsg);

  file->read_hook = save_first_sector;
  if (grub_file_read (file, tmp_img, GRUB_DISK_SECTOR_SIZE)
      != GRUB_DISK_SECTOR_SIZE)
    grub_util_error ("%s", _("failed to read the first sector of the core image"));

  block = first_block;
  file->read_hook = save_blocklists;
  if (grub_file_read (file, tmp_img, core_size - GRUB_DISK_SECTOR_SIZE)
      != (grub_ssize_t) core_size - GRUB_DISK_SECTOR_SIZE)
    grub_util_error ("%s", _("failed to read the rest sectors of the core image"));

#ifdef GRUB_SETUP_SPARC64
  {
    char *boot_devpath;
    boot_devpath = (char *) (boot_img
			     + GRUB_BOOT_AOUT_HEADER_SIZE
			     + GRUB_BOOT_MACHINE_BOOT_DEVPATH);
    if (dest_dev->disk->id != root_dev->disk->id
	|| dest_dev->disk->dev->id != root_dev->disk->dev->id)
      {
	const char *dest_ofpath;
	dest_ofpath
	  = grub_util_devname_to_ofpath (grub_util_biosdisk_get_osdev (root_dev->disk));
	grub_util_info ("dest_ofpath is `%s'", dest_ofpath);
	strncpy (boot_devpath, dest_ofpath,
		 GRUB_BOOT_MACHINE_BOOT_DEVPATH_END
		 - GRUB_BOOT_MACHINE_BOOT_DEVPATH - 1);
	boot_devpath[GRUB_BOOT_MACHINE_BOOT_DEVPATH_END
		   - GRUB_BOOT_MACHINE_BOOT_DEVPATH - 1] = 0;
      }
    else
      {
	grub_util_info ("non cross-disk install");
	memset (boot_devpath, 0, GRUB_BOOT_MACHINE_BOOT_DEVPATH_END
		- GRUB_BOOT_MACHINE_BOOT_DEVPATH);
      }
    grub_util_info ("boot device path %s", boot_devpath);
  }
#endif

  grub_file_close (file);

  free (core_path_dev);
  free (tmp_img);

  write_rootdev (core_img, root_dev, boot_img, first_sector);

  /* Write the first two sectors of the core image onto the disk.  */
  grub_util_info ("opening the core image `%s'", core_path);
  fp = fopen (core_path, "r+b");
  if (! fp)
    grub_util_error (_("cannot open `%s': %s"), core_path,
		     strerror (errno));

  grub_util_write_image (core_img, GRUB_DISK_SECTOR_SIZE * 2, fp, core_path);
  fclose (fp);

#ifdef GRUB_SETUP_BIOS
 finish:
#endif

  /* Write the boot image onto the disk.  */
  if (grub_disk_write (dest_dev->disk, BOOT_SECTOR,
		       0, GRUB_DISK_SECTOR_SIZE, boot_img))
    grub_util_error ("%s", grub_errmsg);

  grub_util_biosdisk_flush (root_dev->disk);
  grub_util_biosdisk_flush (dest_dev->disk);

  free (core_path);
  free (core_img);
  free (boot_img);
  grub_device_close (dest_dev);
  grub_device_close (root_dev);
}

static struct argp_option options[] = {
  {"boot-image",  'b', N_("FILE"), 0,
   N_("use FILE as the boot image [default=%s]"), 0},
  {"core-image",  'c', N_("FILE"), 0,
   N_("use FILE as the core image [default=%s]"), 0},
  {"directory",   'd', N_("DIR"),  0,
   N_("use GRUB files in the directory DIR [default=%s]"), 0},
  {"device-map",  'm', N_("FILE"), 0,
   N_("use FILE as the device map [default=%s]"), 0},
  {"force",       'f', 0,      0,
   N_("install even if problems are detected"), 0},
  {"skip-fs-probe",'s',0,      0,
   N_("do not probe for filesystems in DEVICE"), 0},
  {"verbose",     'v', 0,      0, N_("print verbose messages."), 0},
  {"allow-floppy", 'a', 0,      0,
   N_("make the drive also bootable as floppy (default for fdX devices). May break on some BIOSes."), 0},

  { 0, 0, 0, 0, 0, 0 }
};

static char *
help_filter (int key, const char *text, void *input __attribute__ ((unused)))
{
  switch (key)
    {
      case 'b':
        return xasprintf (text, DEFAULT_BOOT_FILE);

      case 'c':
        return xasprintf (text, DEFAULT_CORE_FILE);

      case 'd':
        return xasprintf (text, DEFAULT_DIRECTORY);

      case 'm':
        return xasprintf (text, DEFAULT_DEVICE_MAP);

      default:
        return (char *) text;
    }
}

struct arguments
{
  char *boot_file;
  char *core_file;
  char *dir;
  char *dev_map;
  int  force;
  int  fs_probe;
  int allow_floppy;
  char *device;
};

static error_t
argp_parser (int key, char *arg, struct argp_state *state)
{
  /* Get the input argument from argp_parse, which we
     know is a pointer to our arguments structure. */
  struct arguments *arguments = state->input;

  switch (key)
    {
      case 'a':
        arguments->allow_floppy = 1;
        break;

      case 'b':
        if (arguments->boot_file)
          free (arguments->boot_file);

        arguments->boot_file = xstrdup (arg);
        break;

      case 'c':
        if (arguments->core_file)
          free (arguments->core_file);

        arguments->core_file = xstrdup (arg);
        break;

      case 'd':
        if (arguments->dir)
          free (arguments->dir);

        arguments->dir = xstrdup (arg);
        break;

      case 'm':
        if (arguments->dev_map)
          free (arguments->dev_map);

        arguments->dev_map = xstrdup (arg);
        break;

      case 'f':
        arguments->force = 1;
        break;

      case 's':
        arguments->fs_probe = 0;
        break;

      case 'v':
        verbosity++;
        break;

      case ARGP_KEY_ARG:
        if (state->arg_num == 0)
          arguments->device = xstrdup(arg);
        else
          {
            /* Too many arguments. */
	    fprintf (stderr, _("Unknown extra argument `%s'."), arg);
	    fprintf (stderr, "\n");
            argp_usage (state);
          }
        break;

      case ARGP_KEY_NO_ARGS:
          fprintf (stderr, "%s", _("No device is specified.\n"));
          argp_usage (state);
	  exit (1);
          break;

      default:
        return ARGP_ERR_UNKNOWN;
    }

  return 0;
}

static struct argp argp = {
  options, argp_parser, N_("DEVICE"),
  "\n"N_("\
Set up images to boot from DEVICE.\n\
\n\
You should not normally run this program directly.  Use grub-install instead.")
"\v"N_("\
DEVICE must be an OS device (e.g. /dev/sda)."),
  NULL, help_filter, NULL
};

static char *
get_device_name (char *dev)
{
  size_t len = strlen (dev);

  if (dev[0] != '(' || dev[len - 1] != ')')
    return 0;

  dev[len - 1] = '\0';
  return dev + 1;
}

int
main (int argc, char *argv[])
{
  char *root_dev = NULL;
  char *dest_dev = NULL;
  struct arguments arguments;

  set_program_name (argv[0]);

  grub_util_init_nls ();

  /* Default option values. */
  memset (&arguments, 0, sizeof (struct arguments));
  arguments.fs_probe  = 1;

  /* Parse our arguments */
  if (argp_parse (&argp, argc, argv, 0, 0, &arguments) != 0)
    {
      fprintf (stderr, "%s", _("Error in parsing command line arguments\n"));
      exit(1);
    }

#ifdef GRUB_SETUP_SPARC64
  arguments.force = 1;
#endif

  if (verbosity > 1)
    grub_env_set ("debug", "all");

  /* Initialize the emulated biosdisk driver.  */
  grub_util_biosdisk_init (arguments.dev_map ? : DEFAULT_DEVICE_MAP);

  /* Initialize all modules. */
  grub_init_all ();
  grub_gcry_init_all ();

  grub_lvm_fini ();
  grub_mdraid09_fini ();
  grub_mdraid1x_fini ();
  grub_diskfilter_fini ();
  grub_diskfilter_init ();
  grub_mdraid09_init ();
  grub_mdraid1x_init ();
  grub_lvm_init ();

  dest_dev = get_device_name (arguments.device);
  if (! dest_dev)
    {
      /* Possibly, the user specified an OS device file.  */
      dest_dev = grub_util_get_grub_dev (arguments.device);
      if (! dest_dev)
        {
          char *program = xstrdup(program_name);
          fprintf (stderr, _("Invalid device `%s'.\n"), arguments.device);
          argp_help (&argp, stderr, ARGP_HELP_STD_USAGE, program);
          free(program);
          exit(1);
        }
      grub_util_info ("transformed OS device `%s' into GRUB device `%s'",
                      arguments.device, dest_dev);
    }
  else
    {
      /* For simplicity.  */
      dest_dev = xstrdup (dest_dev);
      grub_util_info ("Using `%s' as GRUB device", dest_dev);
    }

  /* Do the real work.  */
  setup (arguments.dir ? : DEFAULT_DIRECTORY,
	 arguments.boot_file ? : DEFAULT_BOOT_FILE,
	 arguments.core_file ? : DEFAULT_CORE_FILE,
	 dest_dev, arguments.force,
	 arguments.fs_probe, arguments.allow_floppy);

  /* Free resources.  */
  grub_fini_all ();
  grub_util_biosdisk_fini ();

  free (arguments.boot_file);
  free (arguments.core_file);
  free (arguments.dir);
  free (arguments.dev_map);
  free (arguments.device);
  free (root_dev);
  free (dest_dev);

  return 0;
}