From 507736c87c49712ac618169d17a659bd6c25eecc Mon Sep 17 00:00:00 2001
From: Colin Watson <cjwatson@ubuntu.com>
Date: Fri, 2 Jul 2010 12:32:05 +0100
Subject: [PATCH] * util/grub-mkconfig_lib.in (uses_abstraction): New function.
 * util/grub.d/10_linux.in: Use it to check for LVM, so that LVM-on-RAID is
 handled correctly.

---
 ChangeLog                 |  6 ++++++
 util/grub-mkconfig_lib.in | 12 ++++++++++++
 util/grub.d/10_linux.in   |  2 +-
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index badca6588..fc139b4ca 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-07-02  Colin Watson  <cjwatson@ubuntu.com>
+
+	* util/grub-mkconfig_lib.in (uses_abstraction): New function.
+	* util/grub.d/10_linux.in: Use it to check for LVM, so that
+	LVM-on-RAID is handled correctly.
+
 2010-07-02  Colin Watson  <cjwatson@ubuntu.com>
 
 	* docs/grub.texi (Changes from GRUB Legacy): New section.
diff --git a/util/grub-mkconfig_lib.in b/util/grub-mkconfig_lib.in
index bdd2b8c6f..9a77d1bdf 100644
--- a/util/grub-mkconfig_lib.in
+++ b/util/grub-mkconfig_lib.in
@@ -190,3 +190,15 @@ version_find_latest ()
 gettext_quoted () {
   $gettext "$@" | sed "s/'/'\\\\''/g"
 }
+
+uses_abstraction () {
+  device=$1
+
+  abstraction="`${grub_probe} --device ${device} --target=abstraction`"
+  for module in ${abstraction}; do
+    if test "x${module}" = "x$2"; then
+      return 0
+    fi
+  done
+  return 1
+}
diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
index 2e0143df2..14b85c7f1 100644
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -45,7 +45,7 @@ esac
 
 if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
     || ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
-    || [ "x`grub-probe -t abstraction --device ${GRUB_DEVICE}`" = "xlvm"  ] ; then
+    || uses_abstraction "${GRUB_DEVICE}" lvm; then
   LINUX_ROOT_DEVICE=${GRUB_DEVICE}
 else
   LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}