0ad07e928a
The grub-editenv create command will wrongly overwrite /boot/grub2/grubenv with a regular file if grubenv is a symbolic link. But instead, it should create a new file in the path the symlink points to. This lets /boot/grub2/grubenv be a symlink to /boot/efi/EFI/fedora/grubenv even when they're different mount points, which allows grub2-editenv to be the same across platforms (i.e. UEFI vs BIOS). For example, in Fedora the GRUB EFI builds have prefix set to /EFI/fedora (on the EFI System Partition), but for BIOS machine it'll be /boot/grub2 (which may or may not be its own mountpoint). With this patch, on EFI machines we can make /boot/grub2/grubenv a symlink to /boot/efi/EFI/fedora/grubenv, and the same copy of grub-set-default will work on both kinds of systems. Windows doesn't implement a readlink primitive, so the current behaviour is maintained for this operating system. Signed-off-by: Peter Jones <pjones@redhat.com> Signed-off-by: Jonathan Lebon <jlebon@redhat.com> Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/* editenv.c - tool to edit environment block. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008,2009,2010,2013 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <grub/types.h>
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#include <grub/emu/misc.h>
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#include <grub/util/misc.h>
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#include <grub/util/install.h>
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#include <grub/lib/envblk.h>
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#include <grub/i18n.h>
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#include <grub/emu/hostfile.h>
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#include <errno.h>
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#include <string.h>
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#if !defined(_WIN32)
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#include <libgen.h>
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#endif
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#define DEFAULT_ENVBLK_SIZE 1024
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#define GRUB_ENVBLK_MESSAGE "# WARNING: Do not edit this file by tools other than "PACKAGE"-editenv!!!\n"
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void
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grub_util_create_envblk_file (const char *name)
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{
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FILE *fp;
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char *buf, *pbuf, *namenew;
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#if !defined(_WIN32)
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ssize_t size = 1;
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char *rename_target = xstrdup (name);
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int rc;
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#endif
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buf = xmalloc (DEFAULT_ENVBLK_SIZE);
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namenew = xasprintf ("%s.new", name);
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fp = grub_util_fopen (namenew, "wb");
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if (! fp)
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grub_util_error (_("cannot open `%s': %s"), namenew,
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strerror (errno));
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pbuf = buf;
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memcpy (pbuf, GRUB_ENVBLK_SIGNATURE, sizeof (GRUB_ENVBLK_SIGNATURE) - 1);
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pbuf += sizeof (GRUB_ENVBLK_SIGNATURE) - 1;
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memcpy (pbuf, GRUB_ENVBLK_MESSAGE, sizeof (GRUB_ENVBLK_MESSAGE) - 1);
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pbuf += sizeof (GRUB_ENVBLK_MESSAGE) - 1;
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memset (pbuf , '#',
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DEFAULT_ENVBLK_SIZE - sizeof (GRUB_ENVBLK_SIGNATURE) - sizeof (GRUB_ENVBLK_MESSAGE) + 2);
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if (fwrite (buf, 1, DEFAULT_ENVBLK_SIZE, fp) != DEFAULT_ENVBLK_SIZE)
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grub_util_error (_("cannot write to `%s': %s"), namenew,
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strerror (errno));
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if (grub_util_file_sync (fp) < 0)
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grub_util_error (_("cannot sync `%s': %s"), namenew, strerror (errno));
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free (buf);
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fclose (fp);
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#if defined(_WIN32)
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if (grub_util_rename (namenew, name) < 0)
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grub_util_error (_("cannot rename the file %s to %s"), namenew, name);
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#else
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while (1)
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{
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char *linkbuf;
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ssize_t retsize;
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linkbuf = xmalloc (size + 1);
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retsize = grub_util_readlink (rename_target, linkbuf, size);
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if (retsize < 0 && (errno == ENOENT || errno == EINVAL))
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{
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free (linkbuf);
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break;
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}
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else if (retsize < 0)
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{
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free (linkbuf);
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grub_util_error (_("cannot rename the file %s to %s: %m"), namenew, name);
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}
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else if (retsize == size)
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{
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free (linkbuf);
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size += 128;
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continue;
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}
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linkbuf[retsize] = '\0';
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if (linkbuf[0] == '/')
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{
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free (rename_target);
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rename_target = linkbuf;
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}
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else
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{
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char *dbuf = xstrdup (rename_target);
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const char *dir = dirname (dbuf);
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free (rename_target);
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rename_target = xasprintf ("%s/%s", dir, linkbuf);
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free (dbuf);
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free (linkbuf);
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}
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}
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rc = grub_util_rename (namenew, rename_target);
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if (rc < 0 && errno == EXDEV)
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{
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rc = grub_install_copy_file (namenew, rename_target, 1);
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grub_util_unlink (namenew);
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}
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free (rename_target);
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if (rc < 0)
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grub_util_error (_("cannot rename the file %s to %s: %m"), namenew, name);
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#endif
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free (namenew);
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}
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