File grub2-10_linux-avoid-multi-device-root-kernel-argument.patch of Package grub2.2174

From 7290bb5623cd8d9b50b756d0ea40eb6a269985e7 Mon Sep 17 00:00:00 2001
From: Andrei Borzenkov <arvidjaar@gmail.com>
Date: Mon, 1 Feb 2016 20:13:48 +0300
Subject: [PATCH] 10_linux: avoid multi-device root= kernel argument

If root filesystem is multidev btrfs, do not attempt to pass all devices as
kernel root= argument. This results in splitting command line in GRUB due to
embedded newline and even if we managed to quote it, kernel does not know how
to interpret it anyway. Multidev btrfs requires user space device scanning,
so passing single device would not work too.

This still respects user settings GRUB_DISABLE_LINUX_UUID. Not sure what we
should do in this case.

Closes: 45709
---
 util/grub.d/10_linux.in     | 4 +++-
 util/grub.d/20_linux_xen.in | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

Index: grub-2.02~beta2/util/grub.d/10_linux.in
===================================================================
--- grub-2.02~beta2.orig/util/grub.d/10_linux.in
+++ grub-2.02~beta2/util/grub.d/10_linux.in
@@ -43,9 +43,11 @@ case ${GRUB_DEVICE} in
   ;;
 esac
 
+# btrfs may reside on multiple devices. We cannot pass them as value of root= parameter
+# and mounting btrfs requires user space scanning, so force UUID in this case.
 if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
     || ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
-    || uses_abstraction "${GRUB_DEVICE}" lvm; then
+    || test -e "${GRUB_DEVICE}" && uses_abstraction "${GRUB_DEVICE}" lvm; then
   LINUX_ROOT_DEVICE=${GRUB_DEVICE}
 else
   LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
Index: grub-2.02~beta2/util/grub.d/20_linux_xen.in
===================================================================
--- grub-2.02~beta2.orig/util/grub.d/20_linux_xen.in
+++ grub-2.02~beta2/util/grub.d/20_linux_xen.in
@@ -53,9 +53,11 @@ case ${GRUB_DEVICE} in
   ;;
 esac
 
+# btrfs may reside on multiple devices. We cannot pass them as value of root= parameter
+# and mounting btrfs requires user space scanning, so force UUID in this case.
 if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
     || ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
-    || uses_abstraction "${GRUB_DEVICE}" lvm; then
+    || test -e "${GRUB_DEVICE}" && uses_abstraction "${GRUB_DEVICE}" lvm; then
   LINUX_ROOT_DEVICE=${GRUB_DEVICE}
 else
   LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}