File grub2-pass-corret-root-for-nfsroot.patch of Package grub2

From 340fd0c8717c2bf33163a18bfec72243b0e51862 Mon Sep 17 00:00:00 2001
From: Michael Chang <mchang@suse.com>
Date: Thu, 30 Aug 2012 15:43:17 +0800
Subject: [PATCH] Pass corret root= for nfsroot

References: bnc#774548, bsc#1069094
Patch-Mainline: no

Fix / is mounted on nfs. The fix is to pass kernel parameters
with correct root= for nfs. However since grub2 doesn't support
nfs file system module, the /boot on nfs is not possible and
grub2-probe not work in probing nfs mounted path. The fix is merely
on the script level and not use grub2-probe for above reasons.

v2: Filter out autofs and securityfs from /proc/self/mountinfo (bsc#1069094)

---
 util/grub-mkconfig.in |   37 ++++++++++++++++++++++++++++++-------
 1 files changed, 30 insertions(+), 7 deletions(-)

Index: grub-2.02/util/grub-mkconfig.in
===================================================================
--- grub-2.02.orig/util/grub-mkconfig.in
+++ grub-2.02/util/grub-mkconfig.in
@@ -131,22 +131,47 @@ else
     exit 1
 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
+probe_nfsroot_device () {
+    while read line ; do
+        part1=`echo $line | sed -e 's! - .*$!!'`
+        part2=`echo $line | sed -n -e 's! - \(.*\)$!\n\1!p' | sed 1d`
 
-# 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
+        set -- $part1
+        path=$5
+
+        set -- $part2
+        fstype=$1
+        device=$2
+
+        if [ "x${path}" = "x/" ] &&
+           [ "x${fstype}" = "xnfs" -o "x${fstype}" = "xnfs4" ] ; then
+            echo "${fstype}:$device"
+            return
+        fi
+    done
+}
+
+NFSROOT_DEVICE="`awk '($9!="autofs")&&($9!="securityfs")' /proc/self/mountinfo | probe_nfsroot_device`"
 
-# Filesystem for the device containing our userland.  Used for stuff like
-# choosing Hurd filesystem module.
-GRUB_FS="`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2> /dev/null || echo unknown`"
+if [ "x${NFSROOT_DEVICE}" != "x" ]; then
+    GRUB_DEVICE=""
+    GRUB_DEVICE_UUID=""
+    GRUB_FS="unknown"
+else
+    # 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
 
-if [ x"$GRUB_FS" = xunknown ]; then
-    GRUB_FS="$(stat -f --printf=%T / || echo unknown)"
+
+    if [ x"$GRUB_FS" = x ] || [ x"$GRUB_FS" = xunknown ]; then
+	GRUB_FS="$(stat -f --printf=%T / || echo unknown)"
+    fi
 fi
 
+# 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
+
 if test -f ${sysconfdir}/default/grub ; then
   . ${sysconfdir}/default/grub
 fi
Index: grub-2.02/util/grub.d/10_linux.in
===================================================================
--- grub-2.02.orig/util/grub.d/10_linux.in
+++ grub-2.02/util/grub.d/10_linux.in
@@ -76,6 +76,12 @@ linux_entry ()
   type="$3"
   args="$4"
 
+  if [ -n "${linux_root_device_thisversion}" ]; then
+    root_device="root=${linux_root_device_thisversion}"
+  else
+    root_device=""
+  fi
+
   if [ -z "$boot_device_id" ]; then
       boot_device_id="$(grub_get_device_id "${GRUB_DEVICE}")"
   fi
@@ -131,7 +137,7 @@ linux_entry ()
   message="$(gettext_printf "Loading Linux %s ..." ${version})"
   sed "s/^/$submenu_indentation/" << EOF
 	echo	'$(echo "$message" | grub_quote)'
-	linux	${rel_dirname}/${basename} root=${linux_root_device_thisversion} ${args}
+	linux	${rel_dirname}/${basename} ${root_device} ${args}
 EOF
   if test -n "${initrd}" ; then
     # TRANSLATORS: ramdisk isn't identifier. Should be translated.
Index: grub-2.02/util/grub.d/20_linux_xen.in
===================================================================
--- grub-2.02.orig/util/grub.d/20_linux_xen.in
+++ grub-2.02/util/grub.d/20_linux_xen.in
@@ -91,6 +91,11 @@ linux_entry ()
   type="$4"
   args="$5"
   xen_args="$6"
+  if [ -n "${linux_root_device_thisversion}" ]; then
+    root_device="root=${linux_root_device_thisversion}"
+  else
+    root_device=""
+  fi
   if [ -z "$boot_device_id" ]; then
       boot_device_id="$(grub_get_device_id "${GRUB_DEVICE}")"
   fi
@@ -130,7 +135,7 @@ linux_entry ()
         fi
 	multiboot	${rel_xen_dirname}/${xen_basename} placeholder ${xen_args} \${xen_rm_opts}
 	echo	'$(echo "$lmessage" | grub_quote)'
-	module	${rel_dirname}/${basename} placeholder root=${linux_root_device_thisversion} ${args}
+	module	${rel_dirname}/${basename} placeholder ${root_device} ${args}
 EOF
   if test -n "${initrd}" ; then
     # TRANSLATORS: ramdisk isn't identifier. Should be translated.