[bug #67134] Backup GTP table should be used when primary is corrupted

Alice <[email protected]> Sat, 17 May 2025 04:46:59 -0400 (EDT)

Newsgroups	gmane.comp.boot-loaders.grub.bugs
Message-ID	<[email protected]>

URL:
  <https://savannah.gnu.org/bugs/?67134>

                 Summary: Backup GTP table should be used when primary is
corrupted
                   Group: GNU GRUB
               Submitter: nonbin
               Submitted: Sat 17 May 2025 08:46:50 AM GMT
                Category: Disk &amp; Partition
                Severity: Major
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name:
        Originator Email:
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
                 Release:
         Reproducibility: None
         Planned Release: None


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Follow-up Comments:


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Date: Sat 17 May 2025 08:46:50 AM GMT By: Alice <nonbin>
I have NixOS with GRUB 2.12, I installed Windows on a separate partition,
which corrupted the main GPT table.

I was dumped to the grub shell (I don't think it was rescue mode) and "ls"
showed only hd0 with no partitions. I then booted a live  USB to diagnose, and
running fdisk gave me the message: "The backup GPT table is corrupt, but the
primary appears OK, so that will be used." I copied the backup table and
everything went back to normal.

My suggestions for improving this type of issue:
- show a message explaining why we have fallen back to shell or rescue (in all
cases)
- boot using the backup table after a confirmation
- add a shell and rescue command to use the backup table







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