[GRUB PARTUUID PATCH V8 4/4] Update grub script template files

[Nicholas Vinson <nvinson234@gmail.com>]

Update grub-mkconfig.in and 10_linux.in to support grub-probe's new
partuuid target.  Update grub.texi documenation.

Signed-off-by: Nicholas Vinson <nvinson234@gmail.com>
---
 docs/grub.texi          |  9 +++++++++
 util/grub-mkconfig.in   |  3 +++
 util/grub.d/10_linux.in | 12 +++++++++---
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/docs/grub.texi b/docs/grub.texi
index 65b4bbeda..019ce5d03 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -1424,6 +1424,15 @@ the Linux kernel, using a @samp{root=UUID=...} kernel parameter.  This is
 usually more reliable, but in some cases it may not be appropriate.  To
 disable the use of UUIDs, set this option to @samp{true}.
 
+@item GRUB_ENABLE_LINUX_PARTUUID
+Setting this option to @samp{true} changes the behavior of
+@command{grub-mkconfig} so that it identifies the device containing the root
+filesystem by the partition UUID via the @samp{root=PARTUUID=...} kernel
+parameter.  This is desirable for Linux systems where identifying the root
+filesystem by its filesystem UUID or device name is inappropriate.  However,
+this option is only supported in Linux kernel versions 2.6.37 (3.10 for systems
+using the MSDOS partition scheme) or newer.
+
 @item GRUB_DISABLE_RECOVERY
 If this option is set to @samp{true}, disable the generation of recovery
 mode menu entries.
diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
index 35ef583b0..9a1f92bdf 100644
--- a/util/grub-mkconfig.in
+++ b/util/grub-mkconfig.in
@@ -134,6 +134,7 @@ 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
 
 # Device containing our /boot partition.  Usually the same as GRUB_DEVICE.
 GRUB_DEVICE_BOOT="`${grub_probe} --target=device /boot`"
@@ -188,6 +189,7 @@ if [ "x${GRUB_ACTUAL_DEFAULT}" = "xsaved" ] ; then GRUB_ACTUAL_DEFAULT="`"${grub
 # override them.
 export GRUB_DEVICE \
   GRUB_DEVICE_UUID \
+  GRUB_DEVICE_PARTUUID \
   GRUB_DEVICE_BOOT \
   GRUB_DEVICE_BOOT_UUID \
   GRUB_FS \
@@ -223,6 +225,7 @@ export GRUB_DEFAULT \
   GRUB_TERMINAL_OUTPUT \
   GRUB_SERIAL_COMMAND \
   GRUB_DISABLE_LINUX_UUID \
+  GRUB_ENABLE_LINUX_PARTUUID \
   GRUB_DISABLE_RECOVERY \
   GRUB_VIDEO_BACKEND \
   GRUB_GFXMODE \
diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
index faedf74e1..53de33bea 100644
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -45,12 +45,18 @@ 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/${GRUB_DEVICE_UUID}" \
+if [ "x${GRUB_DEVICE_UUID}" = "x" ] && [ "x${GRUB_DEVICE_PARTUUID}" = "x" ] \
+    || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
+    || ( ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
+        && ! test -e "/dev/disk/by-partuuid/${GRUB_DEVICE_PARTUUID}" ) \
     || ( test -e "${GRUB_DEVICE}" && uses_abstraction "${GRUB_DEVICE}" lvm ); then
   LINUX_ROOT_DEVICE=${GRUB_DEVICE}
-else
+elif [ "x${GRUB_ENABLE_LINUX_PARTUUID}" != "xtrue" ] \
+    || [ "x${GRUB_DEVICE_PARTUUID}" = "x" ] \
+    || ! test -e "/dev/disk/by-partuuid/${GRUB_DEVICE_PARTUUID}"; then
   LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
+else
+  LINUX_ROOT_DEVICE=PARTUUID=${GRUB_DEVICE_PARTUUID}
 fi
 
 case x"$GRUB_FS" in
-- 
2.16.3