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grub-editenv: Make grub-editenv chase symlinks including those across devices

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The grub-editenv create command will wrongly overwrite /boot/grub2/grubenv
with a regular file if grubenv is a symbolic link. But instead, it should
create a new file in the path the symlink points to.

This lets /boot/grub2/grubenv be a symlink to /boot/efi/EFI/fedora/grubenv
even when they're different mount points, which allows grub2-editenv to be
the same across platforms (i.e. UEFI vs BIOS).

For example, in Fedora the GRUB EFI builds have prefix set to /EFI/fedora
(on the EFI System Partition), but for BIOS machine it'll be /boot/grub2
(which may or may not be its own mountpoint).

With this patch, on EFI machines we can make /boot/grub2/grubenv a symlink
to /boot/efi/EFI/fedora/grubenv, and the same copy of grub-set-default will
work on both kinds of systems.

Windows doesn't implement a readlink primitive, so the current behaviour is
maintained for this operating system.

Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Jonathan Lebon <jlebon@redhat.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Peter Jones 2020-01-17 17:10:43 +01:00 • committed by Daniel Kiper
parent 03e72830ab
commit 0ad07e928a
2 changed files with 76 additions and 0 deletions
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11
Makefile.util.def
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@ -242,8 +242,19 @@ program = {
common = util/grub-editenv.c;
common = util/editenv.c;
common = util/grub-install-common.c;
common = grub-core/osdep/init.c;
common = grub-core/osdep/compress.c;
extra_dist = grub-core/osdep/unix/compress.c;
extra_dist = grub-core/osdep/basic/compress.c;
common = util/mkimage.c;
common = util/grub-mkimage32.c;
common = util/grub-mkimage64.c;
common = grub-core/osdep/config.c;
common = util/config.c;
common = util/resolve.c;
ldadd = '$(LIBLZMA)';
ldadd = libgrubmods.a;
ldadd = libgrubgcry.a;
ldadd = libgrubkern.a;