update: simplify r-base kernel support

Author: inureyes

r-base/Dockerfile.4.0.4

@@ -92,7 +92,6 @@ RUN jupyter nbextensions_configurator enable && \
     jupyter lab build
 
 COPY ./service-defs /etc/backend.ai/service-defs
-RUN rm /etc/backend.ai/service-defs/rstudio.json
 COPY bootstrap_rocker2.sh /opt/container/bootstrap.sh
 COPY userconf_backendai.sh /rocker_scripts/userconf.sh
 COPY userconf_backendai.sh /etc/cont-init.d/userconf

r-base/service-defs/rstudio.json

@@ -0,0 +1,5 @@
+{
+  "command": [
+    "/usr/lib/rstudio-server/bin/rserver"
+  ]
+}

r-base/userconf_backendai.sh

@@ -15,7 +15,6 @@ bold=$(tput bold)
 normal=$(tput sgr0)
 
 if [[ ${DISABLE_AUTH,,} == "true" ]]
-
 then
 	mv /etc/rstudio/disable_auth_rserver.conf /etc/rstudio/rserver.conf
 	echo "USER=$USER" >> /etc/environment
@@ -49,23 +48,8 @@ if [ "$USERID" -lt 1000 ]
     fi
 fi
 
-if [ "$USERID" -ne 1000 ]
-## Configure user with a different USERID if requested.
-  then
-    echo "deleting user rstudio"
-    userdel rstudio
-    usermod -a -G staff $USER
-elif [ "$USER" != "rstudio" ]
-  then
-    ## cannot move home folder when it's a shared volume, have to copy and change permissions instead
-    cp -r /home/rstudio /home/$USER
-    ## RENAME the user
-    usermod -l $USER -d /home/$USER rstudio
-    groupmod -n $USER rstudio
-    usermod -a -G staff $USER
-    chown -R $USER:$USER /home/$USER
-    echo "USER is now $USER"
-fi
+#userdel rstudio
+usermod -a -G staff $USER
 
 if [ "$GROUPID" -ne 1000 ]
 ## Configure the primary GID (whether rstudio or $USER) with a different GROUPID if requested.
@@ -75,9 +59,6 @@ if [ "$GROUPID" -ne 1000 ]
     echo "Primary group ID is now custom_group $GROUPID"
 fi
 
-## Add a password to user
-echo "$USER:$PASSWORD" | chpasswd
-
 # Use Env flag to know if user should be added to sudoers
 if [[ ${ROOT,,} == "true" ]]
   then