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grub-install: Allow to install to non-EFI ESP when --force

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Although the EFI specification enforces support for FAT ESP, it's free
for EFI implementations to implement support for ESPs with other formats
(e.g. ext4, ntfs, etc), and at least U-Boot EFI will support ext4 ESP if
U-Boot is built with ext4 support. In some situations a GRUB installation
on such a non-FAT ESP could be useful (e.g. a NTFS-based USB disk that
can dual boot a Windows installation media and a Linux LiveCD).

As this is advanced and implementation-dependent behavior, let grub-install
allow this kind of installation, but only when --force is specified.

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Icenowy Zheng 2022-04-24 15:36:33 +08:00 committed by Daniel Kiper
parent 63d3211403
commit 3aec085410
1 changed files with 6 additions and 1 deletions
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7
util/grub-install.c
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@ -1092,7 +1092,12 @@ main (int argc, char *argv[])
efidir_is_mac = 1;
if (!efidir_is_mac && grub_strcmp (fs->name, "fat") != 0)
grub_util_error (_("%s doesn't look like an EFI partition"), efidir);
{
if (force)
grub_util_warn (_("%s doesn't look like an EFI partition, system may not boot"), efidir);
else
grub_util_error (_("%s doesn't look like an EFI partition"), efidir);
}
/* The EFI specification requires that an EFI System Partition must
contain an "EFI" subdirectory, and that OS loaders are stored in