# TODO
warn '............MOUNT.............'
# TODO
mount -o remount,rw /sysroot
rm /sysroot/test.qcow2
dnbd3_device_node='/dev/dnbd0'
qemu-img create -f qcow2 -o \
    backing_file="$dnbd3_device_node",backing_fmt=qcow2 /sysroot/test.qcow2
insmod /usr/lib/modules/3.10.0-229.1.2.el7.x86_64/extra/nbd.ko
systemd_preserve_process_marker /usr/bin/qemu-nbd --connect /dev/nbd0 \
    /sysroot/test.qcow2 --socket /sysroot/qemu-nbd-TEST #--aio=native --nocache
#mount /dev/nbd0 /sysroot/TEST
# strace -ff -o /sysroot/log.txt -p PID