[bug #62756] grub-install fails with /dev/md_NAME style device names

[Csordás Hunor]

URL:
  <https://savannah.gnu.org/bugs/?62756>

                 Summary: grub-install fails with /dev/md_NAME style device
names
                 Project: GNU GRUB
               Submitter: hunor
               Submitted: Tue 12 Jul 2022 05:36:30 PM UTC
                Category: Installation
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: Git master
                 Release: 
         Discussion Lock: Any
         Reproducibility: Every Time
         Planned Release: None


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Follow-up Comments:


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Date: Tue 12 Jul 2022 05:36:30 PM UTC By: Csordás Hunor <hunor>
I get the following error from grub-install on Linux with named md devices:


# grub-install --no-nvram
Installing for x86_64-efi platform.
grub-install: error: unknown kind of RAID device `/dev/md_efi'.


The reason is that grub_util_get_raid_grub_dev in
grub-core/osdep/linux/getroot.c doesn't support this device name format, and
fails before even trying to figure out the mduuid/* one.

The device name is not arbitary - the mdadm utility creates device names like
this in /dev if the "CREATE names=yes" option is present in its configuration
file. Incidentally, mdadm (because of a bug) requires this option to allow the
creation of the usual /dev/md/NAME symlinks since Linux 5.18 (unless the
kernel is configured with the "new" CONFIG_BLOCK_LEGACY_AUTOLOAD config
option).







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