117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
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/* 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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