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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Tue, 19 Mar 2019 01:27:57 +0100
Subject: [PATCH] Only set blsdir if /boot/loader/entries is in a btrfs or zfs
 partition

Commit bfc756f8d86 ("Set blsdir if the BLS directory path isn't one of the
looked up by default") attempted to set blsdir if /boot/loader/entries was
not the real path of the directory containing the BLS snippets. Which may
be the case if for example /boot/loader/entries is in a btrfs subvolume.

But in the case of ostree, /boot/loader is a symlink to the directory with
the entries for the current deployment. So with ostree the blsdir will be
wrongly set, since GRUB is able to follow the symlinks just fine. In fact,
it has to follow the symlink since otherwise GRUB will always use the BLS
files for the deployment that the symlink pointed out when blsdir was set.

So only set blsdir if /boot/loader/entries is in a btrfs or zfs partition.

Related: rhbz#1688453

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
 util/grub.d/10_linux.in     | 3 ++-
 util/grub.d/10_linux_bls.in | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
index 2547dd52115..8f7ecf65df9 100644
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -169,7 +169,8 @@ EOF
 
     if [ "x${GRUB_GRUBENV_UPDATE}" = "xyes" ]; then
         blsdir="/boot/loader/entries"
-        if [ -d "${blsdir}" ]; then
+        [ -d "${blsdir}" ] && GRUB_BLS_FS="$(${grub_probe} --target=fs ${blsdir})"
+        if [ "x${GRUB_BLS_FS}" = "xbtrfs" ] || [ "x${GRUB_BLS_FS}" = "xzfs" ]; then
             blsdir=$(make_system_path_relative_to_its_root "${blsdir}")
             if [ "x${blsdir}" != "x/loader/entries" ] && [ "x${blsdir}" != "x/boot/loader/entries" ]; then
                 ${grub_editenv} - set blsdir="${blsdir}"
diff --git a/util/grub.d/10_linux_bls.in b/util/grub.d/10_linux_bls.in
index 47b87c8a14b..1707e86f2d3 100644
--- a/util/grub.d/10_linux_bls.in
+++ b/util/grub.d/10_linux_bls.in
@@ -227,7 +227,8 @@ linux_entry ()
 
     if [ "x${GRUB_GRUBENV_UPDATE}" = "xyes" ]; then
         blsdir="/boot/loader/entries"
-        if [ -d "${blsdir}" ]; then
+        [ -d "${blsdir}" ] && GRUB_BLS_FS="$(${grub_probe} --target=fs ${blsdir})"
+        if [ "x${GRUB_BLS_FS}" = "xbtrfs" ] || [ "x${GRUB_BLS_FS}" = "xzfs" ]; then
             blsdir=$(make_system_path_relative_to_its_root "${blsdir}")
             if [ "x${blsdir}" != "x/loader/entries" ] && [ "x${blsdir}" != "x/boot/loader/entries" ]; then
                 ${grub_editenv} - set blsdir="${blsdir}"