From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Michael Chang <mchang@suse.com>
Date: Thu, 21 Aug 2014 03:39:11 +0000
Subject: [PATCH] grub2-btrfs-05-grub2-mkconfig

---
 util/grub-mkconfig.in       |  3 ++-
 util/grub-mkconfig_lib.in   |  4 ++++
 util/grub.d/00_header.in    | 24 +++++++++++++++++++++++-
 util/grub.d/10_linux.in     |  4 ++++
 util/grub.d/20_linux_xen.in |  4 ++++
 5 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
index 8218f3d47..4248b9341 100644
--- a/util/grub-mkconfig.in
+++ b/util/grub-mkconfig.in
@@ -258,7 +258,8 @@ export GRUB_DEFAULT \
   GRUB_BADRAM \
   GRUB_OS_PROBER_SKIP_LIST \
   GRUB_DISABLE_SUBMENU \
-  GRUB_DEFAULT_DTB
+  GRUB_DEFAULT_DTB \
+  SUSE_BTRFS_SNAPSHOT_BOOTING
 
 if test "x${grub_cfg}" != "x"; then
   rm -f "${grub_cfg}.new"
diff --git a/util/grub-mkconfig_lib.in b/util/grub-mkconfig_lib.in
index 113a41f94..b3aae534d 100644
--- a/util/grub-mkconfig_lib.in
+++ b/util/grub-mkconfig_lib.in
@@ -52,7 +52,11 @@ grub_warn ()
 
 make_system_path_relative_to_its_root ()
 {
+  if [ "x${SUSE_BTRFS_SNAPSHOT_BOOTING}" = "xtrue" ] ; then
+  "${grub_mkrelpath}" -r "$1"
+  else
   "${grub_mkrelpath}" "$1"
+  fi
 }
 
 is_path_readable_by_grub ()
diff --git a/util/grub.d/00_header.in b/util/grub.d/00_header.in
index 858b526c9..e2a533001 100644
--- a/util/grub.d/00_header.in
+++ b/util/grub.d/00_header.in
@@ -27,6 +27,14 @@ export TEXTDOMAINDIR="@localedir@"
 
 . "$pkgdatadir/grub-mkconfig_lib"
 
+if [ "x${SUSE_BTRFS_SNAPSHOT_BOOTING}" = "xtrue" ] &&
+   [ "x${GRUB_FS}" = "xbtrfs" ] ; then
+    cat <<EOF
+set btrfs_relative_path="y"
+export btrfs_relative_path
+EOF
+fi
+
 # Do this as early as possible, since other commands might depend on it.
 # (e.g. the `loadfont' command might need lvm or raid modules)
 for i in ${GRUB_PRELOAD_MODULES} ; do
@@ -45,7 +53,9 @@ if [ "x${GRUB_TIMEOUT_BUTTON}" = "x" ] ; then GRUB_TIMEOUT_BUTTON="$GRUB_TIMEOUT
 cat << EOF
 set pager=1
 
-if [ -s \$prefix/grubenv ]; then
+if [ -f \${config_directory}/grubenv ]; then
+  load_env -f \${config_directory}/grubenv
+elif [ -s \$prefix/grubenv ]; then
   load_env
 fi
 EOF
@@ -356,3 +366,15 @@ fi
 if [ "x${GRUB_BADRAM}" != "x" ] ; then
   echo "badram ${GRUB_BADRAM}"
 fi
+
+if [ "x${SUSE_BTRFS_SNAPSHOT_BOOTING}" = "xtrue" ] &&
+   [ "x${GRUB_FS}" = "xbtrfs" ] ; then
+    # Note: No $snapshot_num on *read-only* rollback!  (bsc#901487)
+    cat <<EOF
+if [ -n "\$extra_cmdline" ]; then
+  submenu "Bootable snapshot #\$snapshot_num" {
+    menuentry "If OK, run 'snapper rollback' and reboot." { true; }
+  }
+fi
+EOF
+fi
diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
index 4e49ccdf7..d9a05937e 100644
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -66,10 +66,14 @@ fi
 
 case x"$GRUB_FS" in
     xbtrfs)
+	if [ "x${SUSE_BTRFS_SNAPSHOT_BOOTING}" = "xtrue" ]; then
+	GRUB_CMDLINE_LINUX="${GRUB_CMDLINE_LINUX} \${extra_cmdline}"
+	else
 	rootsubvol="`make_system_path_relative_to_its_root /`"
 	rootsubvol="${rootsubvol#/}"
 	if [ "x${rootsubvol}" != x ]; then
 	    GRUB_CMDLINE_LINUX="rootflags=subvol=${rootsubvol} ${GRUB_CMDLINE_LINUX}"
+	fi
 	fi;;
     xzfs)
 	rpool=`${grub_probe} --device ${GRUB_DEVICE} --target=fs_label 2>/dev/null || true`
diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
index 972a4b5a0..bcdc3ceac 100644
--- a/util/grub.d/20_linux_xen.in
+++ b/util/grub.d/20_linux_xen.in
@@ -73,10 +73,14 @@ fi
 
 case x"$GRUB_FS" in
     xbtrfs)
+	if [ "x${SUSE_BTRFS_SNAPSHOT_BOOTING}" = "xtrue" ]; then
+	GRUB_CMDLINE_LINUX="${GRUB_CMDLINE_LINUX} \${extra_cmdline}"
+	else
 	rootsubvol="`make_system_path_relative_to_its_root /`"
 	rootsubvol="${rootsubvol#/}"
 	if [ "x${rootsubvol}" != x ]; then
 	    GRUB_CMDLINE_LINUX="rootflags=subvol=${rootsubvol} ${GRUB_CMDLINE_LINUX}"
+	fi
 	fi;;
     xzfs)
 	rpool=`${grub_probe} --device ${GRUB_DEVICE} --target=fs_label 2>/dev/null || true`