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/* editenv.c - tool to edit environment block. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008,2009,2010,2013 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.h>
#include <grub/types.h>
#include <grub/emu/misc.h>
#include <grub/util/misc.h>
#include <grub/util/install.h>
#include <grub/lib/envblk.h>
#include <grub/i18n.h>
#include <grub/emu/hostfile.h>
#include <errno.h>
#include <string.h>
#if !defined(_WIN32)
#include <libgen.h>
#endif
#define DEFAULT_ENVBLK_SIZE 1024
#define GRUB_ENVBLK_MESSAGE "# WARNING: Do not edit this file by tools other than "PACKAGE"-editenv!!!\n"
void
grub_util_create_envblk_file (const char *name)
{
FILE *fp;
char *buf, *pbuf, *namenew;
#if !defined(_WIN32)
ssize_t size = 1;
char *rename_target = xstrdup (name);
int rc;
#endif
buf = xmalloc (DEFAULT_ENVBLK_SIZE);
namenew = xasprintf ("%s.new", name);
fp = grub_util_fopen (namenew, "wb");
if (! fp)
grub_util_error (_("cannot open `%s': %s"), namenew,
strerror (errno));
pbuf = buf;
memcpy (pbuf, GRUB_ENVBLK_SIGNATURE, sizeof (GRUB_ENVBLK_SIGNATURE) - 1);
pbuf += sizeof (GRUB_ENVBLK_SIGNATURE) - 1;
memcpy (pbuf, GRUB_ENVBLK_MESSAGE, sizeof (GRUB_ENVBLK_MESSAGE) - 1);
pbuf += sizeof (GRUB_ENVBLK_MESSAGE) - 1;
memset (pbuf , '#',
DEFAULT_ENVBLK_SIZE - sizeof (GRUB_ENVBLK_SIGNATURE) - sizeof (GRUB_ENVBLK_MESSAGE) + 2);
if (fwrite (buf, 1, DEFAULT_ENVBLK_SIZE, fp) != DEFAULT_ENVBLK_SIZE)
grub_util_error (_("cannot write to `%s': %s"), namenew,
strerror (errno));
if (grub_util_file_sync (fp) < 0)
grub_util_error (_("cannot sync `%s': %s"), namenew, strerror (errno));
free (buf);
fclose (fp);
#if defined(_WIN32)
if (grub_util_rename (namenew, name) < 0)
grub_util_error (_("cannot rename the file %s to %s"), namenew, name);
#else
while (1)
{
char *linkbuf;
ssize_t retsize;
linkbuf = xmalloc (size + 1);
retsize = grub_util_readlink (rename_target, linkbuf, size);
if (retsize < 0 && (errno == ENOENT || errno == EINVAL))
{
free (linkbuf);
break;
}
else if (retsize < 0)
{
free (linkbuf);
grub_util_error (_("cannot rename the file %s to %s: %m"), namenew, name);
}
else if (retsize == size)
{
free (linkbuf);
size += 128;
continue;
}
linkbuf[retsize] = '\0';
if (linkbuf[0] == '/')
{
free (rename_target);
rename_target = linkbuf;
}
else
{
char *dbuf = xstrdup (rename_target);
const char *dir = dirname (dbuf);
free (rename_target);
rename_target = xasprintf ("%s/%s", dir, linkbuf);
free (dbuf);
free (linkbuf);
}
}
rc = grub_util_rename (namenew, rename_target);
if (rc < 0 && errno == EXDEV)
{
rc = grub_install_copy_file (namenew, rename_target, 1);
grub_util_unlink (namenew);
}
free (rename_target);
if (rc < 0)
grub_util_error (_("cannot rename the file %s to %s: %m"), namenew, name);
#endif
free (namenew);
}
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