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grub/util/grub-fstest.c
Peter Jones d5a32255de misc: Make grub_strtol() "end" pointers have safer const qualifiers 
Currently the string functions grub_strtol(), grub_strtoul(), and
grub_strtoull() don't declare the "end" pointer in such a way as to
require the pointer itself or the character array to be immutable to the
implementation, nor does the C standard do so in its similar functions,
though it does require us not to change any of it.

The typical declarations of these functions follow this pattern:

long
strtol(const char * restrict nptr, char ** restrict endptr, int base);

Much of the reason for this is historic, and a discussion of that
follows below, after the explanation of this change.  (GRUB currently
does not include the "restrict" qualifiers, and we name the arguments a
bit differently.)

The implementation is semantically required to treat the character array
as immutable, but such accidental modifications aren't stopped by the
compiler, and the semantics for both the callers and the implementation
of these functions are sometimes also helped by adding that requirement.

This patch changes these declarations to follow this pattern instead:

long
strtol(const char * restrict nptr,
       const char ** const restrict endptr,
       int base);

This means that if any modification to these functions accidentally
introduces either an errant modification to the underlying character
array, or an accidental assignment to endptr rather than *endptr, the
compiler should generate an error.  (The two uses of "restrict" in this
case basically mean strtol() isn't allowed to modify the character array
by going through *endptr, and endptr isn't allowed to point inside the
array.)

It also means the typical use case changes to:

  char *s = ...;
  const char *end;
  long l;

  l = strtol(s, &end, 10);

Or even:

  const char *p = str;
  while (p && *p) {
	  long l = strtol(p, &p, 10);
	  ...
  }

This fixes 26 places where we discard our attempts at treating the data
safely by doing:

  const char *p = str;
  long l;

  l = strtol(p, (char **)&ptr, 10);

It also adds 5 places where we do:

  char *p = str;
  while (p && *p) {
	  long l = strtol(p, (const char ** const)&p, 10);
	  ...
	  /* more calls that need p not to be pointer-to-const */
  }

While moderately distasteful, this is a better problem to have.

With one minor exception, I have tested that all of this compiles
without relevant warnings or errors, and that /much/ of it behaves
correctly, with gcc 9 using 'gcc -W -Wall -Wextra'.  The one exception
is the changes in grub-core/osdep/aros/hostdisk.c , which I have no idea
how to build.

Because the C standard defined type-qualifiers in a way that can be
confusing, in the past there's been a slow but fairly regular stream of
churn within our patches, which add and remove the const qualifier in many
of the users of these functions.  This change should help avoid that in
the future, and in order to help ensure this, I've added an explanation
in misc.h so that when someone does get a compiler warning about a type
error, they have the fix at hand.

The reason we don't have "const" in these calls in the standard is
purely anachronistic: C78 (de facto) did not have type qualifiers in the
syntax, and the "const" type qualifier was added for C89 (I think; it
may have been later).  strtol() appears to date from 4.3BSD in 1986,
which means it could not be added to those functions in the standard
without breaking compatibility, which is usually avoided.

The syntax chosen for type qualifiers is what has led to the churn
regarding usage of const, and is especially confusing on string
functions due to the lack of a string type.  Quoting from C99, the
syntax is:

 declarator:
  pointer[opt] direct-declarator
 direct-declarator:
  identifier
  ( declarator )
  direct-declarator [ type-qualifier-list[opt] assignment-expression[opt] ]
  ...
  direct-declarator [ type-qualifier-list[opt] * ]
  ...
 pointer:
  * type-qualifier-list[opt]
  * type-qualifier-list[opt] pointer
 type-qualifier-list:
  type-qualifier
  type-qualifier-list type-qualifier
 ...
 type-qualifier:
  const
  restrict
  volatile

So the examples go like:

const char foo;			// immutable object
const char *foo;		// mutable pointer to object
char * const foo;		// immutable pointer to mutable object
const char * const foo;		// immutable pointer to immutable object
const char const * const foo; 	// XXX extra const keyword in the middle
const char * const * const foo; // immutable pointer to immutable
				//   pointer to immutable object
const char ** const foo;	// immutable pointer to mutable pointer
				//   to immutable object

Making const left-associative for * and right-associative for everything
else may not have been the best choice ever, but here we are, and the
inevitable result is people using trying to use const (as they should!),
putting it at the wrong place, fighting with the compiler for a bit, and
then either removing it or typecasting something in a bad way.  I won't
go into describing restrict, but its syntax has exactly the same issue
as with const.

Anyway, the last example above actually represents the *behavior* that's
required of strtol()-like functions, so that's our choice for the "end"
pointer.

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2020-02-28 12:41:29 +01:00

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/* grub-fstest.c - debug tool for filesystem driver */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008,2009,2010 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/misc.h>
#include <grub/device.h>
#include <grub/disk.h>
#include <grub/file.h>
#include <grub/fs.h>
#include <grub/env.h>
#include <grub/term.h>
#include <grub/mm.h>
#include <grub/lib/hexdump.h>
#include <grub/crypto.h>
#include <grub/command.h>
#include <grub/i18n.h>
#include <grub/zfs/zfs.h>
#include <grub/emu/hostfile.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "progname.h"
#pragma GCC diagnostic ignored "-Wmissing-prototypes"
#pragma GCC diagnostic ignored "-Wmissing-declarations"
#include "argp.h"
#pragma GCC diagnostic error "-Wmissing-prototypes"
#pragma GCC diagnostic error "-Wmissing-declarations"
static grub_err_t
execute_command (const char *name, int n, char **args)
{
grub_command_t cmd;
cmd = grub_command_find (name);
if (! cmd)
grub_util_error (_("can't find command `%s'"), name);
return (cmd->func) (cmd, n, args);
}
enum {
CMD_LS = 1,
CMD_CP,
CMD_CAT,
CMD_CMP,
CMD_HEX,
CMD_CRC,
CMD_BLOCKLIST,
CMD_TESTLOAD,
CMD_ZFSINFO,
CMD_XNU_UUID
};
#define BUF_SIZE 32256
static grub_disk_addr_t skip, leng;
static int uncompress = 0;
static void
read_file (char *pathname, int (*hook) (grub_off_t ofs, char *buf, int len, void *hook_arg), void *hook_arg)
{
static char buf[BUF_SIZE];
grub_file_t file;
if ((pathname[0] == '-') && (pathname[1] == 0))
{
grub_device_t dev;
dev = grub_device_open (0);
if ((! dev) || (! dev->disk))
grub_util_error ("%s", grub_errmsg);
grub_util_info ("total sectors : %" GRUB_HOST_PRIuLONG_LONG,
(unsigned long long) dev->disk->total_sectors);
if (! leng)
leng = (dev->disk->total_sectors << GRUB_DISK_SECTOR_BITS) - skip;
while (leng)
{
grub_size_t len;
len = (leng > BUF_SIZE) ? BUF_SIZE : leng;
if (grub_disk_read (dev->disk, 0, skip, len, buf))
{
char *msg = grub_xasprintf (_("disk read fails at offset %lld, length %lld"),
(long long) skip, (long long) len);
grub_util_error ("%s", msg);
}
if (hook (skip, buf, len, hook_arg))
break;
skip += len;
leng -= len;
}
grub_device_close (dev);
return;
}
file = grub_file_open (pathname, ((uncompress == 0)
? GRUB_FILE_TYPE_NO_DECOMPRESS : GRUB_FILE_TYPE_NONE)
| GRUB_FILE_TYPE_FSTEST);
if (!file)
{
grub_util_error (_("cannot open `%s': %s"), pathname,
grub_errmsg);
return;
}
grub_util_info ("file size : %" GRUB_HOST_PRIuLONG_LONG,
(unsigned long long) file->size);
if (skip > file->size)
{
char *msg = grub_xasprintf (_("invalid skip value %lld"),
(unsigned long long) skip);
grub_util_error ("%s", msg);
return;
}
{
grub_off_t ofs, len;
ofs = skip;
len = file->size - skip;
if ((leng) && (leng < len))
len = leng;
file->offset = skip;
while (len)
{
grub_ssize_t sz;
sz = grub_file_read (file, buf, (len > BUF_SIZE) ? BUF_SIZE : len);
if (sz < 0)
{
char *msg = grub_xasprintf (_("read error at offset %llu: %s"),
(unsigned long long) ofs, grub_errmsg);
grub_util_error ("%s", msg);
break;
}
if ((sz == 0) || (hook (ofs, buf, sz, hook_arg)))
break;
ofs += sz;
len -= sz;
}
}
grub_file_close (file);
}
struct cp_hook_ctx
{
FILE *ff;
const char *dest;
};
static int
cp_hook (grub_off_t ofs, char *buf, int len, void *_ctx)
{
struct cp_hook_ctx *ctx = _ctx;
(void) ofs;
if ((int) fwrite (buf, 1, len, ctx->ff) != len)
{
grub_util_error (_("cannot write to `%s': %s"),
ctx->dest, strerror (errno));
return 1;
}
return 0;
}
static void
cmd_cp (char *src, const char *dest)
{
struct cp_hook_ctx ctx =
{
.dest = dest
};
ctx.ff = grub_util_fopen (dest, "wb");
if (ctx.ff == NULL)
{
grub_util_error (_("cannot open OS file `%s': %s"), dest,
strerror (errno));
return;
}
read_file (src, cp_hook, &ctx);
fclose (ctx.ff);
}
static int
cat_hook (grub_off_t ofs, char *buf, int len, void *_arg __attribute__ ((unused)))
{
(void) ofs;
if ((int) fwrite (buf, 1, len, stdout) != len)
{
grub_util_error (_("cannot write to the stdout: %s"),
strerror (errno));
return 1;
}
return 0;
}
static void
cmd_cat (char *src)
{
read_file (src, cat_hook, 0);
}
static int
cmp_hook (grub_off_t ofs, char *buf, int len, void *ff_in)
{
FILE *ff = ff_in;
static char buf_1[BUF_SIZE];
if ((int) fread (buf_1, 1, len, ff) != len)
{
char *msg = grub_xasprintf (_("read error at offset %llu: %s"),
(unsigned long long) ofs, grub_errmsg);
grub_util_error ("%s", msg);
return 1;
}
if (grub_memcmp (buf, buf_1, len) != 0)
{
int i;
for (i = 0; i < len; i++, ofs++)
if (buf_1[i] != buf[i])
{
char *msg = grub_xasprintf (_("compare fail at offset %llu"),
(unsigned long long) ofs);
grub_util_error ("%s", msg);
return 1;
}
}
return 0;
}
static void
cmd_cmp (char *src, char *dest)
{
FILE *ff;
if (grub_util_is_directory (dest))
{
grub_util_fd_dir_t dir = grub_util_fd_opendir (dest);
grub_util_fd_dirent_t entry;
if (dir == NULL)
{
grub_util_error (_("OS file %s open error: %s"), dest,
grub_util_fd_strerror ());
return;
}
while ((entry = grub_util_fd_readdir (dir)))
{
char *srcnew, *destnew;
char *ptr;
if (strcmp (entry->d_name, ".") == 0
|| strcmp (entry->d_name, "..") == 0)
continue;
srcnew = xmalloc (strlen (src) + sizeof ("/")
+ strlen (entry->d_name));
destnew = xmalloc (strlen (dest) + sizeof ("/")
+ strlen (entry->d_name));
ptr = grub_stpcpy (srcnew, src);
*ptr++ = '/';
strcpy (ptr, entry->d_name);
ptr = grub_stpcpy (destnew, dest);
*ptr++ = '/';
strcpy (ptr, entry->d_name);
if (grub_util_is_special_file (destnew))
continue;
cmd_cmp (srcnew, destnew);
}
grub_util_fd_closedir (dir);
return;
}
ff = grub_util_fopen (dest, "rb");
if (ff == NULL)
{
grub_util_error (_("OS file %s open error: %s"), dest,
strerror (errno));
return;
}
if ((skip) && (fseeko (ff, skip, SEEK_SET)))
grub_util_error (_("cannot seek `%s': %s"), dest,
strerror (errno));
read_file (src, cmp_hook, ff);
{
grub_uint64_t pre;
pre = ftell (ff);
fseek (ff, 0, SEEK_END);
if (pre != ftell (ff))
grub_util_error ("%s", _("unexpected end of file"));
}
fclose (ff);
}
static int
hex_hook (grub_off_t ofs, char *buf, int len, void *arg __attribute__ ((unused)))
{
hexdump (ofs, buf, len);
return 0;
}
static void
cmd_hex (char *pathname)
{
read_file (pathname, hex_hook, 0);
}
static int
crc_hook (grub_off_t ofs, char *buf, int len, void *crc_ctx)
{
(void) ofs;
GRUB_MD_CRC32->write(crc_ctx, buf, len);
return 0;
}
static void
cmd_crc (char *pathname)
{
grub_uint8_t *crc32_context = xmalloc (GRUB_MD_CRC32->contextsize);
GRUB_MD_CRC32->init(crc32_context);
read_file (pathname, crc_hook, crc32_context);
GRUB_MD_CRC32->final(crc32_context);
printf ("%08x\n",
grub_be_to_cpu32 (grub_get_unaligned32 (GRUB_MD_CRC32->read (crc32_context))));
free (crc32_context);
}
static const char *root = NULL;
static int args_count = 0;
static int nparm = 0;
static int num_disks = 1;
static char **images = NULL;
static int cmd = 0;
static char *debug_str = NULL;
static char **args = NULL;
static int mount_crypt = 0;
static void
fstest (int n)
{
char *host_file;
char *loop_name;
int i;
for (i = 0; i < num_disks; i++)
{
char *argv[2];
loop_name = grub_xasprintf ("loop%d", i);
if (!loop_name)
grub_util_error ("%s", grub_errmsg);
host_file = grub_xasprintf ("(host)%s", images[i]);
if (!host_file)
grub_util_error ("%s", grub_errmsg);
argv[0] = loop_name;
argv[1] = host_file;
if (execute_command ("loopback", 2, argv))
grub_util_error (_("`loopback' command fails: %s"), grub_errmsg);
grub_free (loop_name);
grub_free (host_file);
}
{
if (mount_crypt)
{
char *argv[2] = { xstrdup ("-a"), NULL};
if (execute_command ("cryptomount", 1, argv))
grub_util_error (_("`cryptomount' command fails: %s"),
grub_errmsg);
free (argv[0]);
}
}
grub_ldm_fini ();
grub_lvm_fini ();
grub_mdraid09_fini ();
grub_mdraid1x_fini ();
grub_diskfilter_fini ();
grub_diskfilter_init ();
grub_mdraid09_init ();
grub_mdraid1x_init ();
grub_lvm_init ();
grub_ldm_init ();
switch (cmd)
{
case CMD_LS:
execute_command ("ls", n, args);
break;
case CMD_ZFSINFO:
execute_command ("zfsinfo", n, args);
break;
case CMD_CP:
cmd_cp (args[0], args[1]);
break;
case CMD_CAT:
cmd_cat (args[0]);
break;
case CMD_CMP:
cmd_cmp (args[0], args[1]);
break;
case CMD_HEX:
cmd_hex (args[0]);
break;
case CMD_CRC:
cmd_crc (args[0]);
break;
case CMD_BLOCKLIST:
execute_command ("blocklist", n, args);
grub_printf ("\n");
break;
case CMD_TESTLOAD:
execute_command ("testload", n, args);
grub_printf ("\n");
break;
case CMD_XNU_UUID:
{
grub_device_t dev;
grub_fs_t fs;
char *uuid = 0;
char *argv[3] = { xstrdup ("-l"), NULL, NULL};
dev = grub_device_open (n ? args[0] : 0);
if (!dev)
grub_util_error ("%s", grub_errmsg);
fs = grub_fs_probe (dev);
if (!fs)
grub_util_error ("%s", grub_errmsg);
if (!fs->fs_uuid)
grub_util_error ("%s", _("couldn't retrieve UUID"));
if (fs->fs_uuid (dev, &uuid))
grub_util_error ("%s", grub_errmsg);
if (!uuid)
grub_util_error ("%s", _("couldn't retrieve UUID"));
argv[1] = uuid;
execute_command ("xnu_uuid", 2, argv);
grub_free (argv[0]);
grub_free (uuid);
grub_device_close (dev);
}
}
for (i = 0; i < num_disks; i++)
{
char *argv[2];
loop_name = grub_xasprintf ("loop%d", i);
if (!loop_name)
grub_util_error ("%s", grub_errmsg);
argv[0] = xstrdup ("-d");
argv[1] = loop_name;
execute_command ("loopback", 2, argv);
grub_free (loop_name);
grub_free (argv[0]);
}
}
static struct argp_option options[] = {
{0, 0, 0 , OPTION_DOC, N_("Commands:"), 1},
{N_("ls PATH"), 0, 0 , OPTION_DOC, N_("List files in PATH."), 1},
{N_("cp FILE LOCAL"), 0, 0, OPTION_DOC, N_("Copy FILE to local file LOCAL."), 1},
{N_("cat FILE"), 0, 0 , OPTION_DOC, N_("Copy FILE to standard output."), 1},
{N_("cmp FILE LOCAL"), 0, 0, OPTION_DOC, N_("Compare FILE with local file LOCAL."), 1},
{N_("hex FILE"), 0, 0 , OPTION_DOC, N_("Show contents of FILE in hex."), 1},
{N_("crc FILE"), 0, 0 , OPTION_DOC, N_("Get crc32 checksum of FILE."), 1},
{N_("blocklist FILE"), 0, 0, OPTION_DOC, N_("Display blocklist of FILE."), 1},
{N_("xnu_uuid DEVICE"), 0, 0, OPTION_DOC, N_("Compute XNU UUID of the device."), 1},
{"root", 'r', N_("DEVICE_NAME"), 0, N_("Set root device."), 2},
{"skip", 's', N_("NUM"), 0, N_("Skip N bytes from output file."), 2},
{"length", 'n', N_("NUM"), 0, N_("Handle N bytes in output file."), 2},
{"diskcount", 'c', N_("NUM"), 0, N_("Specify the number of input files."), 2},
{"debug", 'd', N_("STRING"), 0, N_("Set debug environment variable."), 2},
{"crypto", 'C', NULL, 0, N_("Mount crypto devices."), 2},
{"zfs-key", 'K',
/* TRANSLATORS: "prompt" is a keyword. */
N_("FILE|prompt"), 0, N_("Load zfs crypto key."), 2},
{"verbose", 'v', NULL, 0, N_("print verbose messages."), 2},
{"uncompress", 'u', NULL, 0, N_("Uncompress data."), 2},
{0, 0, 0, 0, 0, 0}
};
/* Print the version information. */
static void
print_version (FILE *stream, struct argp_state *state)
{
fprintf (stream, "%s (%s) %s\n", program_name, PACKAGE_NAME, PACKAGE_VERSION);
}
void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
static error_t
argp_parser (int key, char *arg, struct argp_state *state)
{
const char *p;
switch (key)
{
case 'r':
root = arg;
return 0;
case 'K':
if (strcmp (arg, "prompt") == 0)
{
char buf[1024];
grub_puts_ (N_("Enter ZFS password: "));
if (grub_password_get (buf, 1023))
{
grub_zfs_add_key ((grub_uint8_t *) buf, grub_strlen (buf), 1);
}
}
else
{
FILE *f;
ssize_t real_size;
grub_uint8_t buf[1024];
f = grub_util_fopen (arg, "rb");
if (!f)
{
printf (_("%s: error:"), program_name);
printf (_("cannot open `%s': %s"), arg, strerror (errno));
printf ("\n");
return 0;
}
real_size = fread (buf, 1, 1024, f);
fclose (f);
if (real_size < 0)
{
printf (_("%s: error:"), program_name);
printf (_("cannot read `%s': %s"), arg, strerror (errno));
printf ("\n");
return 0;
}
grub_zfs_add_key (buf, real_size, 0);
}
return 0;
case 'C':
mount_crypt = 1;
return 0;
case 's':
skip = grub_strtoul (arg, &p, 0);
if (*p == 's')
skip <<= GRUB_DISK_SECTOR_BITS;
return 0;
case 'n':
leng = grub_strtoul (arg, &p, 0);
if (*p == 's')
leng <<= GRUB_DISK_SECTOR_BITS;
return 0;
case 'c':
num_disks = grub_strtoul (arg, NULL, 0);
if (num_disks < 1)
{
fprintf (stderr, "%s", _("Invalid disk count.\n"));
argp_usage (state);
}
if (args_count != 0)
{
/* TRANSLATORS: disk count is optional but if it's there it must
be before disk list. So please don't imply disk count as mandatory.
*/
fprintf (stderr, "%s", _("Disk count must precede disks list.\n"));
argp_usage (state);
}
return 0;
case 'd':
debug_str = arg;
return 0;
case 'v':
verbosity++;
return 0;
case 'u':
uncompress = 1;
return 0;
case ARGP_KEY_END:
if (args_count < num_disks)
{
fprintf (stderr, "%s", _("No command is specified.\n"));
argp_usage (state);
}
if (args_count - 1 - num_disks < nparm)
{
fprintf (stderr, "%s", _("Not enough parameters to command.\n"));
argp_usage (state);
}
return 0;
case ARGP_KEY_ARG:
break;
default:
return ARGP_ERR_UNKNOWN;
}
if (args_count < num_disks)
{
if (args_count == 0)
images = xmalloc (num_disks * sizeof (images[0]));
images[args_count] = grub_canonicalize_file_name (arg);
args_count++;
return 0;
}
if (args_count == num_disks)
{
if (!grub_strcmp (arg, "ls"))
{
cmd = CMD_LS;
}
else if (!grub_strcmp (arg, "zfsinfo"))
{
cmd = CMD_ZFSINFO;
}
else if (!grub_strcmp (arg, "cp"))
{
cmd = CMD_CP;
nparm = 2;
}
else if (!grub_strcmp (arg, "cat"))
{
cmd = CMD_CAT;
nparm = 1;
}
else if (!grub_strcmp (arg, "cmp"))
{
cmd = CMD_CMP;
nparm = 2;
}
else if (!grub_strcmp (arg, "hex"))
{
cmd = CMD_HEX;
nparm = 1;
}
else if (!grub_strcmp (arg, "crc"))
{
cmd = CMD_CRC;
nparm = 1;
}
else if (!grub_strcmp (arg, "blocklist"))
{
cmd = CMD_BLOCKLIST;
nparm = 1;
}
else if (!grub_strcmp (arg, "testload"))
{
cmd = CMD_TESTLOAD;
nparm = 1;
}
else if (grub_strcmp (arg, "xnu_uuid") == 0)
{
cmd = CMD_XNU_UUID;
nparm = 0;
}
else
{
fprintf (stderr, _("Invalid command %s.\n"), arg);
argp_usage (state);
}
args_count++;
return 0;
}
args[args_count - 1 - num_disks] = xstrdup (arg);
args_count++;
return 0;
}
struct argp argp = {
options, argp_parser, N_("IMAGE_PATH COMMANDS"),
N_("Debug tool for filesystem driver."),
NULL, NULL, NULL
};
int
main (int argc, char *argv[])
{
const char *default_root;
char *alloc_root;
grub_util_host_init (&argc, &argv);
args = xmalloc (argc * sizeof (args[0]));
argp_parse (&argp, argc, argv, 0, 0, 0);
/* Initialize all modules. */
grub_init_all ();
grub_gcry_init_all ();
if (debug_str)
grub_env_set ("debug", debug_str);
default_root = (num_disks == 1) ? "loop0" : "md0";
alloc_root = 0;
if (root)
{
if ((*root >= '0') && (*root <= '9'))
{
alloc_root = xmalloc (strlen (default_root) + strlen (root) + 2);
sprintf (alloc_root, "%s,%s", default_root, root);
root = alloc_root;
}
}
else
root = default_root;
grub_env_set ("root", root);
if (alloc_root)
free (alloc_root);
/* Do it. */
fstest (args_count - 1 - num_disks);
/* Free resources. */
grub_gcry_fini_all ();
grub_fini_all ();
return 0;
}
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