From fbeda573a9798fda3d18e67cef004df70e412789 Mon Sep 17 00:00:00 2001
From: Eduardo <edward.lara.lara@gmail.com>
Date: Wed, 30 Jun 2021 11:38:27 +0200
Subject: [PATCH] 20-grub-install: Use relative paths for btrfs in BLS snippets

When SUSE_BTRFS_SNAPSHOT_BOOTING=true is set in /etc/default/grub, paths
to kernel and initrd images need to be relative. Since are used along with
snapper, configured so the default btrfs subvolume is the current snapshot.

Resolves: rhbz#1906191
---
 20-grub.install | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/20-grub.install b/20-grub.install
index 436360d..2a0ac32 100755
--- a/20-grub.install
+++ b/20-grub.install
@@ -112,7 +112,12 @@ case "$COMMAND" in
 
             LINUX="$(grep '^linux[ \t]' "${BLS_TARGET}" | sed -e 's,^linux[ \t]*,,')"
             INITRD="$(grep '^initrd[ \t]' "${BLS_TARGET}" | sed -e 's,^initrd[ \t]*,,')"
-            LINUX_RELPATH="$(grub2-mkrelpath /boot${LINUX})"
+            if [[ "$(grub2-probe --device $(grub2-probe --target=device /) --target=fs)" == "btrfs" &&
+		      "${SUSE_BTRFS_SNAPSHOT_BOOTING}" == "true" ]]; then
+                LINUX_RELPATH="$(grub2-mkrelpath -r /boot${LINUX})"
+            else
+                LINUX_RELPATH="$(grub2-mkrelpath /boot${LINUX})"
+            fi
             BOOTPREFIX="$(dirname ${LINUX_RELPATH})"
             ROOTPREFIX="$(dirname "/boot${LINUX}")"