Purge solr service and data from ubuntu

purge-solr-service-and-data.sh

#!/bin/bash
set -eu -o pipefail

# --------------------------------------------
# ---------- USE AT YOUR OWN RISK  -----------
# --------------------------------------------

# Remove Solr from Ubuntu, as long as it was installed with defaults.
# As of 2022, works for any version of solr on any version of Ubuntu.

# --------------------------------------------
# ---------- USE AT YOUR OWN RISK  -----------
# --------------------------------------------


(set -x && service solr stop) || true
(umask 007 && mkdir -pv /var/backups/solr)
DATESTAMP=$(date +%s.%N)
test -d /var/solr/ && {
  BAKFILE="/var/backups/solr/var-solr.$DATESTAMP"
  echo "Backing up /var/solr to $BAKFILE"
  ( umask 007 && tar --create --file "$BAKFILE" --verbose --total --directory /var solr/ )
}
test -d /opt/solr/ && {
  BAKFILE="/var/backups/solr/opt-solr.$DATESTAMP"
  echo "Backing up /opt/solr to $BAKFILE"
  ( umask 007 && tar --create --file "$BAKFILE" --verbose --total --directory /opt solr/ )
}
test -d /etc/ && {
  BAKFILE="/var/backups/solr/etc.$DATESTAMP"
  echo "Backing up /etc to $BAKFILE"
  ( umask 007 && tar --create --file "$BAKFILE" --verbose --total --directory / etc/ )
}
(set -x && rm -r /var/solr/) || true
(set -x && rm -r /opt/solr/) || true   # will remove it if its a dir.
(set -x && rm /opt/solr) || true   # will remove the remaining file if its a symlink
(set -x && rm /etc/init.d/solr) || true
(set -x && deluser --remove-home solr) || true
(set -x && deluser --group solr) || true
(set -x && rm /etc/default/solr.in.sh) || true
(set -x && update-rc.d -f solr remove) || true

>&2 echo '# ----------------------------------------------------------------------'
>&2 echo '# Use following command to verify whether or not removal was successful:'
>&2 echo '# ----------------------------------------------------------------------'
>&2 echo '# :~$ updatedb && locate solr'