L2SS-218 Refined the clean-up script

bootstrap/sbin/rebuild_system_from_scratch.sh

 #! /usr/bin/env bash -e
 
-HOME_DIR=/opt/lofar2.0
+HOME_DIR=${LOFAR20_DIR:-${PWD}}
+if [ ! -d ${HOME_DIR}/bootstrap ]; then
+    # HOME_DIR/bootstrap needs to exist for this script to work.
+    echo -e "$(basename ${0}):\n\nERROR\n\tCannot run this script because the \"bootstrap\" cannot be found!\n\n"
+    exit 1
+fi
+
+trap ' exit ${?} ' ABRT EXIT HUP INT TERM QUIT ERR
 
-trap ' popd; exit ${?} ' ABRT EXIT HUP INT TERM QUIT ERR
 
 function pull_images()
 {
-    pushd ${HOME_DIR}/tango/docker-compose && make pull
+    pushd ${HOME_DIR}/docker-compose && make pull
     popd
 }
 
 function build_lofar_images()
 {
-    pushd ${HOME_DIR}/tango/docker-compose && make build
+    pushd ${HOME_DIR}/docker-compose && make build
     popd
 }
 
 function remove_tango_dir()
 {
-    pushd ${HOME_DIR} && rm -rf  tango
-    popd
+    rm -rf ${HOME_DIR}
 }
 
 function remove_images()
 {
-    ${HOME_DIR}/delete_all_docker_images.sh YES_DELETE_ALL
+    ${HOME_DIR}/bootstrap/sbin/delete_all_docker_images.sh YES_DELETE_ALL
 }
 
 function pull_tango()
 {
-    git clone https://git.astron.nl/lofar2.0/tango.git ${HOME_DIR}/tango
+    git clone https://git.astron.nl/lofar2.0/tango.git ${HOME_DIR}
 }
 
 function stop_images()
 {
-    pushd ${HOME_DIR}/tango/docker-compose && make stop
+    pushd ${HOME_DIR}/docker-compose && make stop
     popd
 }
 
 function clean_images()
 {
-    pushd ${HOME_DIR}/tango/docker-compose && make clean
+    pushd ${HOME_DIR}/docker-compose && make clean
     popd
 }
 
-function start_tango()
+function start_minimal_tango()
 {
-    pushd ${HOME_DIR}/tango/docker-compose
-    make start itango
+    pushd ${HOME_DIR}/docker-compose
+    make start minimal
     make start dsconfig
     popd
 }
 
 function configure_tango_db()
 {
-    ${HOME_DIR}/tango/sbin/update_ConfigDb.sh ${HOME_DIR}/tango/CDB/LOFAR_ConfigDb.json
+    ${HOME_DIR}/sbin/update_ConfigDb.sh ${HOME_DIR}/CDB/LOFAR_ConfigDb.json
 }
 
 function configure_elk()
 {
-    pushd ${HOME_DIR}/tango/docker-compose && make start elk-configure-host
+    pushd ${HOME_DIR}/docker-compose && make start elk-configure-host
     popd
 }
 
 function start_support_images()
 {
-    pushd ${HOME_DIR}/tango/docker-compose && make start elk
+    pushd ${HOME_DIR}/docker-compose && make start elk
     make start jupyter
     popd
 }
 
 function start_lofar_images()
 {
-    pushd ${HOME_DIR}/tango/docker-compose
+    pushd ${HOME_DIR}/docker-compose
     make start device-pcc
     make start device-sdp
     popd
 }
 
+
+# Stop all Docker images.
 stop_images
+
+# Clean out the Docker volumes.
 clean_images
+
+# Delete the tango repo dir.  Notice that this also deletes the bootstrap dir
+# which contains this and the helper scripts.
 remove_tango_dir
-remove_images
+
+# Therefore, since the tango/boostrap dir is now gone, pull the repo first
+# and then continue.
 pull_tango
+
+# Now clean out the docker images.
+remove_images
+
+# Pull SKA's Docker images.
 pull_images
+
+# Build all of the LOFAR Docker images.
 build_lofar_images
-start_tango
+
+# Now start the basic Tango system, including dsconfig.
+start_minimal_tango
+
+# Load LOFAR's TangoDB.
 configure_tango_db
+
+# Now configure the ELK container.
 configure_elk
+
+# Here I start ELK & Jupyter.
 start_support_images
+
+# And finally start all the LOFAR images.
 start_lofar_images
 
+# Now the system should be ready to use.
+# For instance the cold start script could now be executed.