Comment # 1 on bug 1167565 from Fabian Vogt

root=UUID=... is added by kiwi to /etc/sysconfig/bootloader:

[ 3463s] [ INFO    ]: 02:16:15 | --> DEFAULT_APPEND:"loglevel=3 splash=silent
plymouth.enable=0 console=ttyS0,115200n8
root=UUID=08f031d3-88b2-4949-bb58-44d0fb5551e2 rw "

Kiwi calls grub2-mkconfig, but sysconfig is only read by perl-Bootloader, so
this is AFAICT a noop.
In additon to that, the emitted grub.cfg is also patched by kiwi if it's an OBS
build: https://github.com/OSInside/kiwi/pull/1289/files

@ms: Can you explain how ^ is supposed to work?
@lnussel: What's in grub.cfg, /etc/default/grub and /etc/sysconfig/bootloader?

There are some errors in the editbootinstall script later, but I don't think
they're related:

/usr/src/packages/KIWI-oem/build/image-root/image/edit_boot_install.sh: line
45: pushd: /usr/src/packages/KIWIROOT-oem/: No such file or directory
chattr: Operation not supported while setting flags on var/lib/libvirt/images
mount: /usr/src/packages/KIWI-oem/build/image-root/mnt-boot: special device
/dev/mapper/loop0p1 does not exist.

This leads to boot.scr not being copied, but apparently that doesn't break it 

I really recommend using set -e for all kiwi scripts.