using rsync instead of mv to prevent accidental file deletion when bind mount a volume

base-notebook/Dockerfile

@@ -42,6 +42,7 @@ RUN apt-get update --yes && \
     wget \
     ca-certificates \
     sudo \
+    rsync \
     locales \
     fonts-liberation \
     run-one && \

base-notebook/start.sh

@@ -54,7 +54,7 @@ if [ "$(id -u)" == 0 ] ; then
         # (it could be mounted, and we shouldn't create it if it already exists)
         if [[ ! -e "/home/${NB_USER}" ]]; then
             echo "Relocating home dir to /home/${NB_USER}"
-            mv /home/jovyan "/home/${NB_USER}" || ln -s /home/jovyan "/home/${NB_USER}"
+            mkdir "/home/${NB_USER}" && rsync -avx /home/jovyan "/home/${NB_USER}" || ln -s /home/jovyan "/home/${NB_USER}"
         fi
         # if workdir is in /home/jovyan, cd to /home/${NB_USER}
         if [[ "${PWD}/" == "/home/jovyan/"* ]]; then