I'm trying to build a trove guest image and getting error that "SSH keys were not staged by host"

[dongdong]

Environment variables:
export HOST_USERNAME=root
export HOST_SCP_USERNAME=dddscp
export GUEST_USERNAME=dddguest
export CONTROLLER_IP=10.10.1.16
export TROVESTACK_SCRIPTS=/opt/images/trove-master/integration/scripts
export PATH_DISKIMAGEBUILDER=/usr/lib/python2.7/site-packages/diskimage_builder
export RELEASE=trusty
export DISTRO=ubuntu
export SERVICE_TYPE=mariadb
export PATH_TROVE=/opt/stack/trove
export ESCAPED_PATH_TROVE=$(echo $PATH_TROVE | sed 's/\//\\\//g')
export SSH_DIR="/root"
export GUEST_LOGDIR=/opt/guest/log
export ESCAPED_GUEST_LOGDIR=$(echo $GUEST_LOGDIR | sed 's/\//\\\//g')
export DIB_CLOUD_INIT_DATASOURCES="ConfigDrive"
export DATASTORE_PKG_LOCATION=/opt/datastore
#export BRANCH_OVERRIDE
export ELEMENTS_PATH=$TROVESTACK_SCRIPTS/files/elements
export ELEMENTS_PATH+=:$PATH_DISKIMAGEBUILDER/elements
#export ELEMENTS_PATH+=:$PATH_TRIPLEO_ELEMENTS/elements
export DIB_APT_CONF_DIR=/etc/apt/apt.conf.d
export DIB_CLOUD_INIT_ETC_HOSTS=true

Build command:
disk-image-create -a amd64 -o "/opt/images/ubuntu-mariadb.qcow2" ${DISTRO} ${EXTRA_ELEMENTS} vm cloud-init-datasources ${DISTRO}-guest ${DISTRO}-${SERVICE_TYPE}

Error trace:
2018-11-27 19:12:13.904 | dib-run-parts Running /tmp/in_target.d/install.d/62-ssh-key
2018-11-27 19:12:13.908 | + SSH_DIR=/home/dddguest/.ssh
2018-11-27 19:12:13.908 | + TMP_HOOKS_DIR=/tmp/in_target.d
2018-11-27 19:28:53.910 | + '[' -e /tmp/in_target.d/ssh-authorized-keys ']'
2018-11-27 19:28:53.910 | + echo 'SSH Keys were not staged by host'
2018-11-27 19:28:53.910 | SSH Keys were not staged by host

Analysis:
It's will generate ssh-authorized-keys in ...integration/scripts/files/elements/ubuntu-guest/extra-data.d/62-ssh-key file. And it needs `whoami` = "root", howerer the image has only root(/usr/lib/python2.7/site-packages/diskimage_builder/elements/ubuntu/root.d/10-cache-ubuntu-tarball).

How can I fix this bug?

[dongdong (dudd)]

I use OpenStack Rocky.

[dongdong (dudd)]

I comment `whoami` = "root" to skip this condition.