[gnome-continuous-yocto/gnomeostree-3.28-rocko: 6214/8267] image-vm: Avoid use of fold, tac and paste commands for DISK_SIGNATURE

[Emmanuele Bassi <ebassi src gnome org>]

commit d2390c0646eb6c66ea2bbce69cea9d2c412bdd93
Author: Jonathan Liu <net147 gmail com>
Date:   Thu Jun 8 21:07:54 2017 +1000

    image-vm: Avoid use of fold, tac and paste commands for DISK_SIGNATURE
    
    These commands are not whitelisted by the HOSTTOOLS variable which
    silently prevents the MBR disk signature from being written to the
    image.
    
    Reported-by: Michael Davis <michael davis essvote com>
    (From OE-Core rev: a58e53f55259acd79a98a0f8b8a435d2a5aef36e)
    
    Signed-off-by: Jonathan Liu <net147 gmail com>
    Signed-off-by: Ross Burton <ross burton intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/classes/image-vm.bbclass |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meta/classes/image-vm.bbclass b/meta/classes/image-vm.bbclass
index 35c9244..98bd920 100644
--- a/meta/classes/image-vm.bbclass
+++ b/meta/classes/image-vm.bbclass
@@ -93,7 +93,7 @@ build_boot_dd() {
 
        parted $IMAGE print
 
-       awk "BEGIN { printf \"$(echo ${DISK_SIGNATURE} | fold -w 2 | tac | paste -sd '' | sed 
's/\(..\)/\\x&/g')\" }" | \
+       awk "BEGIN { printf \"$(echo ${DISK_SIGNATURE} | sed 
's/\(..\)\(..\)\(..\)\(..\)/\\x\4\\x\3\\x\2\\x\1/')\" }" | \
                dd of=$IMAGE bs=1 seek=440 conv=notrunc
 
        OFFSET=`expr $END2 / 512`