[OE-core] [PATCH][pyro] mkefidsk: fix bash/dash shell quoting problem

[Saul Wold]

mkefidsk currently writes a startup.nsh with embedded control characters.
This happens because \b etc are control sequences to the shell echo
command when using dash. The resulting startup.nsh causes the bootup
to fail, and the user is dropped into the EFI shell to manually run
startup.nsh.

Patch originally provided by Troy D. Hanson <troy.hanson at jhuapl.edu>

[YOCTO #9665]

Signed-off-by: Saul Wold <sgw at linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
(cherry picked from commit 008d6cb5bb4969f53a228893c502be8c9420ecb0)
---
Backport REQUEST

 scripts/contrib/mkefidisk.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/contrib/mkefidisk.sh b/scripts/contrib/mkefidisk.sh
index 800733f..ac4ec9c 100755
--- a/scripts/contrib/mkefidisk.sh
+++ b/scripts/contrib/mkefidisk.sh
@@ -444,7 +444,7 @@ if [ -d $ROOTFS_MNT/etc/udev/ ] ; then
 fi
 
 # Add startup.nsh script for automated boot
-echo "fs0:\EFI\BOOT\bootx64.efi" > $BOOTFS_MNT/startup.nsh
+printf "fs0:\%s\BOOT\%s\n" "EFI" "bootx64.efi" > $BOOTFS_MNT/startup.nsh
 
 
 # Call cleanup to unmount devices and images and remove the TMPDIR
-- 
2.7.5