[OE-core] [PATCH] boot-directdisk: mount root by MBR disk signature for Linux 3.8+

[Jonathan Liu]

Signed-off-by: Jonathan Liu <net...@gmail.com>
---
 meta/classes/boot-directdisk.bbclass | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/meta/classes/boot-directdisk.bbclass 
b/meta/classes/boot-directdisk.bbclass
index 3169043..736bee0 100644
--- a/meta/classes/boot-directdisk.bbclass
+++ b/meta/classes/boot-directdisk.bbclass
@@ -23,7 +23,8 @@ do_bootdirectdisk[depends] += 
"dosfstools-native:do_populate_sysroot \
                                syslinux:do_populate_sysroot \
                                syslinux-native:do_populate_sysroot \
                                parted-native:do_populate_sysroot \
-                               mtools-native:do_populate_sysroot "
+                               mtools-native:do_populate_sysroot \
+                               util-linux-native:do_populate_sysroot "
 
 PACKAGES = " "
 EXCLUDE_FROM_WORLD = "1"
@@ -58,6 +59,22 @@ build_boot_dd() {
        # done in blocks, thus the mod by 16 instead of 32.
        BLOCKS=$(expr $BLOCKS + $(expr 16 - $(expr $BLOCKS % 16)))
 
+       KERNEL_VERSION=$(grep '^VERSION\s*=' ${STAGING_KERNEL_DIR}/Makefile | 
grep -o '[0-9]*$')
+       KERNEL_PATCHLEVEL=$(grep '^PATCHLEVEL\s*=' 
${STAGING_KERNEL_DIR}/Makefile | grep -o '[0-9]*$')
+
+       rm -rf $IMAGE
+       dd if=/dev/zero of=$IMAGE bs=512 seek=1 count=0
+       parted $IMAGE mklabel msdos
+
+       # If using Linux 3.8 or later, mount root by MBR disk signature
+       if [[ $KERNEL_VERSION -eq 3 && $KERNEL_PATCHLEVEL -ge 8 ]] || [ 
$KERNEL_VERSION -gt 3 ]; then
+               # The disk signature generated by GNU Parted isn't really 
random, so regenerate it
+               echo -ne "$(uuidgen | sed 's/-//g;s/\(..\)/\\x&/g')" | dd 
of=$IMAGE bs=1 seek=440 count=4 conv=notrunc
+
+               DISK_SIGNATURE=$(hexdump -s 440 -n 4 -e '4 1 "%02x\n" "\n"' 
$IMAGE | tac | paste -sd '')
+               sed -i "s|\broot=[^ ]*|root=PARTUUID=$DISK_SIGNATURE-02|" 
$HDDDIR/syslinux.cfg
+       fi
+
        mkdosfs -n ${BOOTDD_VOLUME_ID} -S 512 -C $HDDIMG $BLOCKS 
        mcopy -i $HDDIMG -s $HDDDIR/* ::/
 
@@ -71,10 +88,8 @@ build_boot_dd() {
        END3=`expr \( $ROOTFSBLOCKS \* 1024 \) + $END1`
 
        echo $ROOTFSBLOCKS $TOTALSIZE $END1 $END2 $END3
-       rm -rf $IMAGE
        dd if=/dev/zero of=$IMAGE bs=1024 seek=$TOTALSIZE count=1
 
-       parted $IMAGE mklabel msdos
        parted $IMAGE mkpart primary fat16 0 ${END1}B
        parted $IMAGE unit B mkpart primary ext2 ${END2}B ${END3}B
        parted $IMAGE set 1 boot on 
-- 
1.8.2.3

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