From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Peter Jones <pjones@redhat.com>

Date: Thu, 4 Sep 2014 16:49:25 -0400

Subject: [PATCH] Add GRUB_DISABLE_UUID.

This will cause "search --fs-uuid --set=root ..." not to be generated by

grub2-mkconfig, and instead simply attempt to use the grub device name

as it understands it.

Signed-off-by: Peter Jones <pjones@redhat.com>

---

 docs/grub.texi            |  7 +++++++

 util/grub-mkconfig.in     | 22 +++++++++++++++++++---

 util/grub-mkconfig_lib.in |  4 ++--

 3 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/docs/grub.texi b/docs/grub.texi

index 2adfa97be..2fd32608c 100644

--- a/docs/grub.texi

+++ b/docs/grub.texi

@@ -1441,6 +1441,13 @@ enable the use of partition UUIDs, set this option to @samp{false}.

 If this option is set to @samp{true}, disable the generation of recovery

 mode menu entries.

+@item GRUB_DISABLE_UUID

+Normally, @command{grub-mkconfig} will generate menu entries that use

+universally-unique identifiers (UUIDs) to identify various filesystems to

+search for files.  This is usually more reliable, but in some cases it may

+not be appropriate.  To disable this use of UUIDs, set this option to

+@samp{true}.

+

 @item GRUB_VIDEO_BACKEND

 If graphical video support is required, either because the @samp{gfxterm}

 graphical terminal is in use or because @samp{GRUB_GFXPAYLOAD_LINUX} is set,

diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in

index bc5a3f175..b0a8626dd 100644

--- a/util/grub-mkconfig.in

+++ b/util/grub-mkconfig.in

@@ -133,12 +133,12 @@ fi

 # Device containing our userland.  Typically used for root= parameter.

 GRUB_DEVICE="`${grub_probe} --target=device /`"

-GRUB_DEVICE_UUID="`${grub_probe} --device ${GRUB_DEVICE} --target=fs_uuid 2> /dev/null`" || true

-GRUB_DEVICE_PARTUUID="`${grub_probe} --device ${GRUB_DEVICE} --target=partuuid 2> /dev/null`" || true

+GRUB_DEVICE_UUID_GENERATED="`${grub_probe} --device ${GRUB_DEVICE} --target=fs_uuid 2> /dev/null`" || true

+GRUB_DEVICE_PARTUUID_GENERATED="`${grub_probe} --device ${GRUB_DEVICE} --target=partuuid 2> /dev/null`" || true

 # Device containing our /boot partition.  Usually the same as GRUB_DEVICE.

 GRUB_DEVICE_BOOT="`${grub_probe} --target=device /boot`"

-GRUB_DEVICE_BOOT_UUID="`${grub_probe} --device ${GRUB_DEVICE_BOOT} --target=fs_uuid 2> /dev/null`" || true

+GRUB_DEVICE_BOOT_UUID_GENERATED="`${grub_probe} --device ${GRUB_DEVICE_BOOT} --target=fs_uuid 2> /dev/null`" || true

 # Filesystem for the device containing our userland.  Used for stuff like

 # choosing Hurd filesystem module.

@@ -158,6 +158,21 @@ if test -f ${sysconfdir}/default/grub ; then

   . ${sysconfdir}/default/grub

 fi

+if [ "x$GRUB_DISABLE_UUID" != "xtrue" ]; then

+  if [ -z "$GRUB_DEVICE_UUID" ]; then

+    GRUB_DEVICE_UUID="$GRUB_DEVICE_UUID_GENERATED"

+  fi

+  if [ -z "$GRUB_DEVICE_BOOT_UUID" ]; then

+    GRUB_DEVICE_BOOT_UUID="$GRUB_DEVICE_BOOT_UUID_GENERATED"

+  fi

+  if [ -z "$GRUB_DEVICE_UUID" ]; then

+    GRUB_DEVICE_UUID="$GRUB_DEVICE_UUID_GENERATED"

+  fi

+  if [ -z "$GRUB_DEVICE_PART_UUID" ]; then

+    GRUB_DEVICE_PART_UUID="$GRUB_DEVICE_PART_UUID_GENERATED"

+  fi

+fi

+

 # XXX: should this be deprecated at some point?

 if [ "x${GRUB_TERMINAL}" != "x" ] ; then

   GRUB_TERMINAL_INPUT="${GRUB_TERMINAL}"

@@ -227,6 +242,7 @@ export GRUB_DEFAULT \

   GRUB_DISABLE_LINUX_UUID \

   GRUB_DISABLE_LINUX_PARTUUID \

   GRUB_DISABLE_RECOVERY \

+  GRUB_DISABLE_UUID \

   GRUB_VIDEO_BACKEND \

   GRUB_GFXMODE \

   GRUB_BACKGROUND \

diff --git a/util/grub-mkconfig_lib.in b/util/grub-mkconfig_lib.in

index 0f801cab3..1001a1223 100644

--- a/util/grub-mkconfig_lib.in

+++ b/util/grub-mkconfig_lib.in

@@ -156,7 +156,7 @@ prepare_grub_to_access_device ()

   if [ "x$fs_hint" != x ]; then

     echo "set root='$fs_hint'"

   fi

-  if fs_uuid="`"${grub_probe}" --device $@ --target=fs_uuid 2> /dev/null`" ; then

+  if [ "x$GRUB_DISABLE_UUID" != "xtrue" ] && fs_uuid="`"${grub_probe}" --device $@ --target=fs_uuid 2> /dev/null`" ; then

     hints="`"${grub_probe}" --device $@ --target=hints_string 2> /dev/null`" || hints=

     echo "if [ x\$feature_platform_search_hint = xy ]; then"

     echo "  search --no-floppy --fs-uuid --set=root ${hints} ${fs_uuid}"

@@ -173,7 +173,7 @@ grub_get_device_id ()

   IFS='

 '

   device="$1"

-  if fs_uuid="`"${grub_probe}" --device ${device} --target=fs_uuid 2> /dev/null`" ; then

+  if [ "x$GRUB_DISABLE_UUID" != "xtrue" ] && fs_uuid="`"${grub_probe}" --device ${device} --target=fs_uuid 2> /dev/null`" ; then

     echo "$fs_uuid";

   else

     echo $device |sed 's, ,_,g'