051545ddf0
The first hint of something practical, a command that can restore any of the GPT structures from the alternate location. New test case must run under QEMU because the loopback device used by the other unit tests does not support writing.
116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/* gptrepair.c - verify and restore GPT info from alternate location. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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* Copyright (C) 2014 CoreOS, 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 <grub/command.h>
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#include <grub/device.h>
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#include <grub/err.h>
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#include <grub/gpt_partition.h>
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#include <grub/i18n.h>
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#include <grub/misc.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static char *
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trim_dev_name (char *name)
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{
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grub_size_t len = grub_strlen (name);
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if (len && name[0] == '(' && name[len - 1] == ')')
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{
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name[len - 1] = '\0';
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name = name + 1;
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}
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return name;
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}
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static grub_err_t
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grub_cmd_gptrepair (grub_command_t cmd __attribute__ ((unused)),
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int argc, char **args)
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{
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grub_device_t dev = NULL;
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grub_gpt_t gpt = NULL;
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char *dev_name;
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grub_uint32_t primary_crc, backup_crc;
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enum grub_gpt_status old_status;
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if (argc != 1 || !grub_strlen(args[0]))
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "device name required");
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dev_name = trim_dev_name (args[0]);
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dev = grub_device_open (dev_name);
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if (!dev)
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goto done;
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if (!dev->disk)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "not a disk");
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goto done;
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}
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gpt = grub_gpt_read (dev->disk);
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if (!gpt)
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goto done;
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primary_crc = gpt->primary.crc32;
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backup_crc = gpt->backup.crc32;
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old_status = gpt->status;
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if (grub_gpt_repair (dev->disk, gpt))
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goto done;
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if (primary_crc == gpt->primary.crc32 &&
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backup_crc == gpt->backup.crc32 &&
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old_status && gpt->status)
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{
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grub_printf_ (N_("GPT already valid, %s unmodified.\n"), dev_name);
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goto done;
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}
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if (grub_gpt_write (dev->disk, gpt))
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goto done;
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if (!(old_status & GRUB_GPT_PRIMARY_VALID))
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grub_printf_ (N_("Primary GPT for %s repaired.\n"), dev_name);
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if (!(old_status & GRUB_GPT_BACKUP_VALID))
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grub_printf_ (N_("Backup GPT for %s repaired.\n"), dev_name);
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done:
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if (gpt)
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grub_gpt_free (gpt);
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if (dev)
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grub_device_close (dev);
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return grub_errno;
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}
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static grub_command_t cmd;
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GRUB_MOD_INIT(gptrepair)
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{
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cmd = grub_register_command ("gptrepair", grub_cmd_gptrepair,
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N_("DEVICE"),
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N_("Verify and repair GPT on drive DEVICE."));
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}
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GRUB_MOD_FINI(gptrepair)
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{
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grub_unregister_command (cmd);
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}
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