#3505 lnbits PostgresSQl migration finalization (#3507)

* fix missing dependencies

* LNBits SQLite to PostgreSQL migration (#3411)

* LNBits SQLite to PostgreSQL migration

New installations with PostgreSQL configuration, existent data with SQLite.

convert script needs a full start of LNBits prior migrating the old sqlite db's.

User can migrate from raspiblitz menu.

* only fix postgres if it needs to

check for symbolik link of postgres default directory or desired postgres folder

btcpayserver and lnbits could use postgresql

new script to install or uninstall postgresql

* fix typos

* silent apt remove

* fix removed function postgresConfig

call bonus.postgresql.sh to setup PostgreSQL

* Support outdated installation

old installations should upgrade to new tag first

create new data directory /mnt/hdd/app-data/LNBits/data

* Improve migration

Make it a bit more user friendly and prepare for a worst case to revert the migration if something fails unexpectedly

make use of sync method for preparation

* Rework migration workflow

Cant wait for lnbits to start when ExecStartPre is used.

We need a full start of lnbits prior migration, so make use of lsof to check for ports and wait.

dont forget to start postgres service after installation. dont forget to stop postgres after uninstall

* Dont overwrite the backup file

if we start migrate again, the sqlite backup should not be overwritten with postgres data. Keep the backup file.

* add migrate message to menu

add the hint to revert migration manually after migrate script executed

* fix install and data directory

lnbits always needs a data directory

* clean up lnbits settings for migration

even if postgresql is already running, we can extract sqlite backup and start migrate

remove migrateMsg duplicate

* preserve database for reflash

drop database only for migrate, not for regular installations

* set blitz config for LNBits

fix drop database only for migrate, not for regular installations

* Add confirmation dialog and automatic revert

User needs to confirm the process, this will eliminate missclicks

add a migrate revert function to automatically revert if something unexpected happens

let the user call the function manually

* check conv.py on success or revert

if the conversion script fails, revert automatically

* Improve revert message

Do not print the revert hint message if current database is SQLite

* fix read config LNBitsDB

* fix unpack backup

Folder LNBits should never block the restore of backup. Happened after multiple migrations and revert.

* Wait for lnbits v0.9.5

Set commit version with fix for postgresql database and BIGINT for amounts for migrate

Can be set to v0.9.5 tag or above later

* improve migrate backup handling

revert to the current backup and not to the previous backup.

No need for the failed folder state

user message with backup file path

* check psql version once

* supress expected errors

if database exists

Co-authored-by: /rootzoll <christian@geektank.de>

* fix error output on status

Co-authored-by: ChuckNorrison <2964146+ChuckNorrison@users.noreply.github.com>

build_sdcard.sh

@@ -313,18 +313,6 @@ sudo apt clean -y
 sudo apt autoremove -y
 
 echo -e "\n*** Python DEFAULT libs & dependencies ***"
-# make sure /usr/bin/pip exists (and calls pip3 in Debian Buster)
-sudo update-alternatives --install /usr/bin/pip pip /usr/bin/pip3 1
-# 1. libs (for global python scripts)
-# grpcio==1.42.0 googleapis-common-protos==1.53.0 toml==0.10.2 j2cli==0.3.10 requests[socks]==2.21.0
-# 2. For TorBox bridges python scripts (pip3) https://github.com/radio24/TorBox/blob/master/requirements.txt
-# pytesseract mechanize PySocks urwid Pillow requests
-# 3. Nyx
-# setuptools
-python_libs="grpcio==1.42.0 googleapis-common-protos==1.53.0 toml==0.10.2 j2cli==0.3.10 requests[socks]==2.21.0 protobuf==3.20.1 wrapt==1.14.1"
-torbox_libs="pytesseract mechanize PySocks urwid Pillow requests setuptools"
-sudo -H python3 -m pip install --upgrade pip
-sudo -H python3 -m pip install ${python_libs} ${torbox_libs}
 
 if [ -f "/usr/bin/python3.9" ]; then
   # use python 3.9 if available
@@ -345,6 +333,18 @@ else
   exit 1
 fi
 
+# make sure /usr/bin/pip exists (and calls pip3 in Debian Buster)
+sudo update-alternatives --install /usr/bin/pip pip /usr/bin/pip3 1
+# 1. libs (for global python scripts)
+# grpcio==1.42.0 googleapis-common-protos==1.53.0 toml==0.10.2 j2cli==0.3.10 requests[socks]==2.21.0
+# 2. For TorBox bridges python scripts (pip3) https://github.com/radio24/TorBox/blob/master/requirements.txt
+# pytesseract mechanize PySocks urwid Pillow requests
+# 3. Nyx
+# setuptools
+sudo -H python3 -m pip install --upgrade pip
+sudo -H python3 -m pip install grpcio==1.42.0 googleapis-common-protos==1.53.0 toml==0.10.2 j2cli==0.3.10 requests[socks]==2.21.0 protobuf==3.20.1 pathlib2==2.3.7.post1
+sudo -H python3 -m pip install pytesseract mechanize PySocks urwid Pillow requests setuptools
+
 echo -e "\n*** PREPARE ${baseimage} ***"
 
 # make sure the pi user is present

home.admin/config.scripts/bonus.btcpayserver.sh

@@ -25,36 +25,8 @@ source /home/admin/raspiblitz.info
 source <(/home/admin/_cache.sh get state)
 
 function postgresConfig() {
-  # https://github.com/rootzoll/raspiblitz/issues/3218
-  echo "# Install postgres"
-  if sudo apt install -y postgresql-13; then
-    PGVERSION=13
-  elif sudo apt install -y postgresql-12; then
-    PGVERSION=12
-  fi
-  # sudo -u postgres psql -c "show data_directory"
-  #  /var/lib/postgresql/13/main
-  if [ ! -d /var/lib/postgresql/${PGVERSION}/main ]; then
-    sudo  mkdir -p /var/lib/postgresql/${PGVERSION}/main
-    sudo chown -R postgres:postgres /var/lib/postgresql
-    sudo systemctl start postgresql@${PGVERSION}-main
-  fi
-  if [ ! -L /var/lib/postgresql ]; then
-  echo "# Move the postgres data to /mnt/hdd/app-data/postgresql"
-    # stop the postgresql servers
-    sudo su - postgres -c "/usr/lib/postgresql/${PGVERSION}/bin/pg_ctl stop --wait --pgdata=/var/lib/postgresql/${PGVERSION}/main"
-    sudo systemctl stop postgresql@${PGVERSION}-main
-    sudo rsync -av /var/lib/postgresql /mnt/hdd/app-data
-    sudo mv /var/lib/postgresql /var/lib/postgresql.bak
-    sudo rm -rf /var/lib/postgresql # not a symlink.. delete it silently
-    sudo ln -s /mnt/hdd/app-data/postgresql /var/lib/
-    sudo chown -R postgres:postgres /mnt/hdd/app-data/postgresql
-    sudo chmod -R 0700 /mnt/hdd/app-data/postgresql
-    # start
-    sudo systemctl start postgresql@${PGVERSION}-main
-  fi
-  echo "# Check clusters with: pg_lsclusters"
-  pg_lsclusters
+
+  sudo /home/admin/config.scripts/bonus.postgresql.sh on || exit 1
 
   echo "# Generate the database"
   sudo -u postgres psql -c "create database nbxplorermainnet;"
@@ -751,6 +723,7 @@ if [ "$1" = "update" ]; then
       sudo systemctl restart bitcoind
     fi
 
+    # POSTGRES
     postgresConfig
 
     NBXplorerConfig

home.admin/config.scripts/bonus.lnbits.sh

@@ -18,12 +18,103 @@ if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "-help" ]; then
   echo "bonus.lnbits.sh prestart"
   echo "bonus.lnbits.sh repo [githubuser] [branch]"
   echo "bonus.lnbits.sh sync"
+  echo "bonus.lnbits.sh migrate"
   exit 1
 fi
 
 echo "# Running: 'bonus.lnbits.sh $*'"
 source /mnt/hdd/raspiblitz.conf
 
+function postgresConfig() {
+  sudo /home/admin/config.scripts/bonus.postgresql.sh on || exit 1
+  echo "# Generate the database lnbits_db"
+
+  # migrate clean up
+  source <(/home/admin/_cache.sh get LNBitsMigrate)
+  if [ "${LNBitsMigrate}" == "on" ]; then
+    sudo -u postgres psql -c "drop database lnbits_db;"
+    sudo -u postgres psql -c "drop user lnbits_user;"
+  fi
+  # create database for new installations and keep old
+  sudo -u postgres psql -c "create database lnbits_db;" 2>/dev/null
+  sudo -u postgres psql -c "create user lnbits_user with encrypted password 'raspiblitz';" 2>/dev/null
+  sudo -u postgres psql -c "grant all privileges on database lnbits_db to lnbits_user;" 2>/dev/null
+
+  # check
+  check=$(sudo -u postgres psql -c "SELECT datname FROM pg_database;" | grep lnbits_db)
+  if [ "$check" = "" ]; then
+    echo "# postgresConfig failed -> SELECT datname FROM pg_database;"
+    exit 1
+  else
+    echo "# Setup PostgreSQL successful, new database found: $check"
+  fi
+
+  /home/admin/config.scripts/blitz.conf.sh set LNBitsDB "PostgreSQL"  
+}
+
+function migrateMsg() {
+  source <(/home/admin/_cache.sh get LNBitsDB)
+  if [ "${LNBitsDB}" == "PostgreSQL" ]; then
+    if [ -e /mnt/hdd/app-data/LNBits_sqlitedb_backup.tar ]; then
+      echo "SUCCESS - A backup file was found. The migrate progress will revert automatically on failure."
+      echo "For yet unknown reasons, this could be done manually with unpacking the SQLite backup file."
+      echo
+      echo "/home/admin/config.scripts/bonus.lnbits.sh migrate revert"
+      echo
+      echo "********************************************************"
+      echo "*                                                      *"
+      echo "* Revert: /mnt/hdd/app-data/LNBits_sqlitedb_backup.tar *"
+      echo "*                                                      *"
+      echo "********************************************************"
+      echo
+    else
+      echo "You dont have any migration backup files!"
+    fi
+  else
+    echo "ABORT - Your LNBits is still running on old SQLite database."
+    echo "Check for errors, '.dump' and fix your database manually and try again."
+  fi
+}
+
+function revertMigration() {
+  source <(/home/admin/_cache.sh get LNBitsMigrate)
+  if [ "${LNBitsMigrate}" == "on" ]; then
+    echo "# Revert migration, restore SQLite..."
+    sudo systemctl stop lnbits
+
+    # check current backup
+    if [ -e /mnt/hdd/app-data/LNBits_sqlitedb_backup.tar ]; then
+      echo "# Unpack Backup"
+      cd /mnt/hdd/app-data/
+      sudo rm -R /mnt/hdd/app-data/LNBits
+      sudo tar -xf /mnt/hdd/app-data/LNBits_sqlitedb_backup.tar
+      sudo chown lnbits:lnbits -R /mnt/hdd/app-data/LNBits
+    else
+      echo "# No backup file found!"
+    fi
+
+    # update config 
+    echo "# Configure config .env"
+    
+    # clean up
+    sudo sed -i "/^LNBITS_DATABASE_URL=/d" /home/lnbits/lnbits/.env
+    sudo sed -i "/^LNBITS_DATA_FOLDER=/d" /home/lnbits/lnbits/.env
+    sudo bash -c "echo 'LNBITS_DATA_FOLDER=/mnt/hdd/app-data/LNBits' >> /home/lnbits/lnbits/.env"
+
+    # start service
+    echo "# Start LNBits"
+    sudo systemctl start lnbits
+
+    # set blitz config
+    /home/admin/config.scripts/blitz.conf.sh set LNBitsMigrate "off"
+    /home/admin/config.scripts/blitz.conf.sh set LNBitsDB "SQLite"
+
+    echo "# OK revert migration done"
+  else
+    echo "# No migration started yet, nothing to do."
+  fi
+}
+
 # show info menu
 if [ "$1" = "menu" ]; then
 
@@ -117,6 +208,11 @@ Consider adding a IP2TOR Bridge under OPTIONS."
     OPTIONS+=(SWITCH-LND "Switch: Use LND as funding source")
   fi
 
+  # Migrate SQLite to PostgreSQL
+  if [ -e /mnt/hdd/app-data/LNBits/database.sqlite3 ]; then
+    OPTIONS+=(MIGRATE-DB "Migrate SQLite to PostgreSQL database")
+  fi
+
   WIDTH=66
   CHOICE_HEIGHT=$(("${#OPTIONS[@]}/2+1"))
   HEIGHT=$((CHOICE_HEIGHT+7))
@@ -168,6 +264,27 @@ Consider adding a IP2TOR Bridge under OPTIONS."
             read key
             exit 0
             ;;
+        MIGRATE-DB)
+            clear
+            dialog --title "MIGRATE LNBITS" --yesno "
+Do you want to proceed the migration?
+
+Try to migrate your LNBits SQLite database to PostgreSQL. 
+
+This can fail for unknown circumstances. Revert of this process is possible afterwards, a backup will be saved.
+            " 12 65
+            if [ $? -eq 0 ]; then
+              clear     
+              /home/admin/config.scripts/bonus.lnbits.sh migrate
+              echo
+              migrateMsg
+              echo
+              echo "OK please test your LNBits installation."
+              echo "PRESS ENTER to continue"
+              read key              
+            fi
+            exit 0
+            ;;            
         *)
             clear
             exit 0
@@ -199,7 +316,7 @@ if [ "$1" = "status" ]; then
 
     # check for LetsEnryptDomain for DynDns
     error=""
-    source <(sudo /home/admin/config.scripts/blitz.subscriptions.ip2tor.py ip-by-tor $publicIP)
+    source <(sudo /home/admin/config.scripts/blitz.subscriptions.ip2tor.py ip-by-tor $publicIP 2>/dev/null)
     if [ ${#error} -eq 0 ]; then
       echo "publicDomain='${domain}'"
     fi
@@ -396,6 +513,7 @@ if [ "$1" = "sync" ] || [ "$1" = "repo" ]; then
   sudo -u lnbits ./venv/bin/pip install pylightning
   sudo -u lnbits ./venv/bin/pip install secp256k1
   sudo -u lnbits ./venv/bin/pip install pyln-client
+  sudo -u lnbits ./venv/bin/pip install psycopg2 # conv.py postgres migration dependency
 
   # build
   sudo -u lnbits ./venv/bin/python build.py
@@ -495,10 +613,29 @@ if [ "$1" = "1" ] || [ "$1" = "on" ]; then
   sudo -u lnbits touch /home/lnbits/lnbits/.env
   sudo bash -c "echo 'LNBITS_FORCE_HTTPS=0' >> /home/lnbits/lnbits/.env"
 
-  # set database path to HDD data so that its survives updates and migrations
-  sudo mkdir /mnt/hdd/app-data/LNBits 2>/dev/null
+  if [ ! -e /mnt/hdd/app-data/LNBits/database.sqlite3 ]; then
+    echo "# install database: PostgreSQL"
+    # POSTGRES
+    postgresConfig
+
+    # new data directory
+    sudo mkdir -p /mnt/hdd/app-data/LNBits/data
+
+    # config update
+    # example: postgres://<user>:<password>@<host>/<database>
+    sudo bash -c "echo 'LNBITS_DATABASE_URL=postgres://lnbits_user:raspiblitz@localhost:5432/lnbits_db' >> /home/lnbits/lnbits/.env"
+    sudo bash -c "echo 'LNBITS_DATA_FOLDER=/mnt/hdd/app-data/LNBits/data' >> /home/lnbits/lnbits/.env"  
+  else
+    echo "# install database: SQLite"
+    /home/admin/config.scripts/blitz.conf.sh set LNBitsDB "SQLite"
+    
+    # new data directory
+    sudo mkdir -p /mnt/hdd/app-data/LNBits
+
+    # config update
+    sudo bash -c "echo 'LNBITS_DATA_FOLDER=/mnt/hdd/app-data/LNBits' >> /home/lnbits/lnbits/.env"
+  fi
   sudo chown lnbits:lnbits -R /mnt/hdd/app-data/LNBits
-  sudo bash -c "echo 'LNBITS_DATA_FOLDER=/mnt/hdd/app-data/LNBits' >> /home/lnbits/lnbits/.env"
 
   # let switch command part do the detail config
   /home/admin/config.scripts/bonus.lnbits.sh switch ${fundingsource}
@@ -513,6 +650,7 @@ if [ "$1" = "1" ] || [ "$1" = "on" ]; then
   sudo -u lnbits ./venv/bin/pip install pylightning
   sudo -u lnbits ./venv/bin/pip install secp256k1
   sudo -u lnbits ./venv/bin/pip install pyln-client
+  sudo -u lnbits ./venv/bin/pip install psycopg2 # conv.py postgres migration dependency
 
   # build
   sudo -u lnbits ./venv/bin/python build.py
@@ -524,9 +662,9 @@ if [ "$1" = "1" ] || [ "$1" = "on" ]; then
   sudo ufw allow 5001 comment 'lnbits HTTPS'
   echo
 
-    # install service
-    echo "*** Install systemd ***"
-    cat <<EOF | sudo tee /etc/systemd/system/lnbits.service >/dev/null
+  # install service
+  echo "*** Install systemd ***"
+  cat <<EOF | sudo tee /etc/systemd/system/lnbits.service >/dev/null
 # systemd unit for lnbits
 
 [Unit]
@@ -555,15 +693,15 @@ PrivateDevices=true
 WantedBy=multi-user.target
 EOF
 
-    sudo systemctl enable lnbits
+  sudo systemctl enable lnbits
 
-    source <(/home/admin/_cache.sh get state)
-    if [ "${state}" == "ready" ]; then
-      echo "# OK - lnbits service is enabled, system is on ready so starting lnbits service"
-      sudo systemctl start lnbits
-    else
-      echo "# OK - lnbits service is enabled, but needs reboot or manual starting: sudo systemctl start lnbits"
-    fi
+  source <(/home/admin/_cache.sh get state)
+  if [ "${state}" == "ready" ]; then
+    echo "# OK - lnbits service is enabled, system is on ready so starting lnbits service"
+    sudo systemctl start lnbits
+  else
+    echo "# OK - lnbits service is enabled, but needs reboot or manual starting: sudo systemctl start lnbits"
+  fi
 
   # setup nginx symlinks
   if ! [ -f /etc/nginx/sites-available/lnbits_ssl.conf ]; then
@@ -772,6 +910,8 @@ if [ "$1" = "0" ] || [ "$1" = "off" ]; then
 
   if [ ${deleteData} -eq 1 ]; then
     echo "# deleting data"
+    sudo -u postgres psql -c "drop database lnbits_db;"
+    sudo -u postgres psql -c "drop user lnbits_user;"
     sudo rm -R /mnt/hdd/app-data/LNBits
   else
     echo "# keeping data"
@@ -785,5 +925,107 @@ if [ "$1" = "0" ] || [ "$1" = "off" ]; then
   exit 0
 fi
 
+if [ "$1" = "migrate" ] && [ "$2" = "revert" ]; then
+  /home/admin/config.scripts/blitz.conf.sh set LNBitsMigrate "on"
+  revertMigration
+  exit 0
+fi
+
+if [ "$1" = "migrate" ]; then
+
+  if [ -e /mnt/hdd/app-data/LNBits/database.sqlite3 ]; then
+    echo "# Backup SQLite database"
+    # backup current database, but dont overwrite last backup
+    if [ -e /mnt/hdd/app-data/LNBits_sqlitedb_backup.tar ]; then
+      if [ -e /mnt/hdd/app-data/LNBits_sqlitedb_backup.tar.old ]; then
+        echo "# Remove old backup file"
+        sudo rm -f /mnt/hdd/app-data/LNBits_sqlitedb_backup.tar.old
+      fi
+      # keep the last backup as old backup
+      sudo mv /mnt/hdd/app-data/LNBits_sqlitedb_backup.tar /mnt/hdd/app-data/LNBits_sqlitedb_backup.tar.old
+    fi
+    # create new backup
+    sudo tar -cf /mnt/hdd/app-data/LNBits_sqlitedb_backup.tar -C /mnt/hdd/app-data LNBits/
+
+    # update to expected tag
+    cd /home/lnbits/lnbits || exit 1
+
+    # remove existent config for database
+    sudo sed -i "/^LNBITS_DATABASE_URL=/d" /home/lnbits/lnbits/.env 2>/dev/null
+    sudo sed -i "/^LNBITS_DATA_FOLDER=/d" /home/lnbits/lnbits/.env 2>/dev/null
+    # restore sqlite database config
+    sudo bash -c "echo 'LNBITS_DATA_FOLDER=/mnt/hdd/app-data/LNBits' >> /home/lnbits/lnbits/.env"
+
+    #sudo -u lnbits git checkout ${tag}
+    sudo -u lnbits git reset --hard f3b720b690c533b4b28793209f5a71fd01b9af6e # good tested after BIGINT fix (#1030)
+    /home/admin/config.scripts/bonus.lnbits.sh sync || exit 1
+    # stop after sync was done
+    sudo systemctl stop lnbits
+
+    /home/admin/config.scripts/blitz.conf.sh set LNBitsMigrate "on"
+
+    # POSTGRES
+    postgresConfig
+
+    # example: postgres://<user>:<password>@<host>/<database>
+    # add new postgres config
+    sudo bash -c "echo 'LNBITS_DATABASE_URL=postgres://lnbits_user:raspiblitz@localhost:5432/lnbits_db' >> /home/lnbits/lnbits/.env"
+    
+    # clean start on new postgres db prior migration
+    echo "# LNBits first start with clean PostgreSQL"
+    sudo systemctl start lnbits
+
+    # execStartPre is not enough, wait for lnbits is finally running
+    count=0
+    count_max=30
+    while ! nc -zv 127.0.0.1 5000 2>/dev/null;
+    do
+      count=`expr $count + 1`
+      echo "wait for LNBIts to start (${count}s/${count_max}s)"
+      sleep 1
+      if [ $count = $count_max ]; then
+        sudo systemctl status lnbits
+        echo "# FAIL - LNBits service was not able to start"
+        revertMigration
+        exit 1
+      fi
+    done
+    # wait a sec for "✔ All migrations done." (TODO make it pretty)
+    sleep 5
+    echo "# LNBits service looks good"
+    sudo systemctl stop lnbits
+
+    echo "# Start convert old SQLite to new PostgreSQL"
+    if ! sudo -u lnbits ./venv/bin/python tools/conv.py; then
+      echo "FAIL - Convert failed, revert migration process"
+      revertMigration
+      exit 1
+    else
+      echo "# Convert successful"
+    fi
+
+    # cleanup old sqlite data directory
+    echo "# Cleanup old data directory"
+    sudo rm -R /mnt/hdd/app-data/LNBits/
+    # new data directory
+    sudo mkdir -p /mnt/hdd/app-data/LNBits/data
+    sudo chown lnbits:lnbits -R /mnt/hdd/app-data/LNBits/
+
+    echo "# Configure .env"
+    sudo sed -i "/^LNBITS_DATA_FOLDER=/d" /home/lnbits/lnbits/.env 2>/dev/null
+    sudo bash -c "echo 'LNBITS_DATA_FOLDER=/mnt/hdd/app-data/LNBits/data' >> /home/lnbits/lnbits/.env"
+
+    # setting value in raspi blitz config
+    /home/admin/config.scripts/blitz.conf.sh set LNBitsMigrate "off"
+
+    echo "# OK migration done"
+  else
+    echo "# No SQLite data found to migrate from"
+  fi
+
+  sudo systemctl start lnbits
+  exit 0
+fi
+
 echo "FAIL - Unknown Parameter $1"
 exit 1

home.admin/config.scripts/bonus.postgresql.sh

@@ -0,0 +1,93 @@
+#!/bin/bash
+
+# command info
+if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "-help" ]; then
+ echo "config script to install PostgreSQL"
+ echo "bonus.postgresql.sh [on|off]"
+ exit 1
+fi
+
+# switch on
+if [ "$1" = "1" ] || [ "$1" = "on" ]; then
+  # https://github.com/rootzoll/raspiblitz/issues/3218
+  echo "# Install PostgreSQL"
+
+  sudo apt install -y postgresql
+  postgres_datadir="/var/lib/postgresql" # default data dir
+
+  # sudo -u postgres psql -c "show data_directory"
+  #  /var/lib/postgresql/13/main
+  if [ ! -d $postgres_datadir ]; then
+    echo "# Create PostgreSQL data"
+    sudo mkdir -p $postgres_datadir/13/main
+    sudo chown -R postgres:postgres $postgres_datadir
+    # sudo pg_dropcluster 13 main
+    sudo pg_createcluster 13 main --start
+  fi
+
+  fix_postgres=0
+  if [ -L $postgres_datadir ] ; then
+     if [ -e $postgres_datadir ] ; then
+        echo "# Good link in $postgres_datadir"
+     else
+        echo "# Broken link in $postgres_datadir"
+        fix_postgres=1
+     fi
+  elif [ -e $postgres_datadir ] ; then
+     echo "# Not a link in $postgres_datadir"
+     fix_postgres=1
+  else
+     echo "# Missing Link in $postgres_datadir"
+     fix_postgres=1
+  fi
+
+  if [ fix_postgres = 1 ] || [ ! -d /mnt/hdd/app-data/postgresql ]; then
+    echo "# Move the PostgreSQL data to /mnt/hdd/app-data/postgresql"
+    sudo systemctl stop postgresql 2>/dev/null
+    sudo rsync -av $postgres_datadir /mnt/hdd/app-data
+    sudo mv $postgres_datadir /var/lib/postgresql.bak
+    sudo rm -rf $postgres_datadir # not a symlink.. delete it silently
+    sudo ln -s /mnt/hdd/app-data/postgresql /var/lib/
+  fi
+  sudo systemctl enable postgresql
+  sudo systemctl start postgresql
+
+  # check if PostgreSQL was installed
+  if psql --version; then
+    # wait for the postgres server to start
+    count=0
+    count_max=30
+    while ! nc -zv 127.0.0.1 5432 2>/dev/null;
+    do
+      count=`expr $count + 1`
+      echo "sleep $count/$count_max"
+      sleep 1
+      if [ $count = $count_max ]; then
+        sudo systemctl status postgresql
+        echo "FAIL - Was not able to start PostgreSQL service"
+        exit 1
+      fi
+    done
+    echo "OK PostgreSQL installed"
+  else
+    echo "FAIL - Was not able to install PostgreSQL"
+    echo "ABORT - PostgreSQL install"
+    exit 1
+  fi
+
+  exit 0
+fi
+
+# switch off
+if [ "$1" = "0" ] || [ "$1" = "off" ]; then
+  # setting value in raspiblitz config
+  echo "*** REMOVING POSTGRESQL ***"
+  sudo apt remove -y postgresql
+  sudo systemctl stop postgresql 2>/dev/null
+  sudo systemctl disable postgresql
+  echo "OK PostgreSQL removed."
+  exit 0
+fi
+
+echo "FAIL - Unknown Parameter $1"
+exit 1