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_stop_services() {
  /usr/bin/systemctl stop \
                     snapd.service \
                     snapd.socket \
                     snapd.refresh.timer \
                     snapd.refresh.service > /dev/null 2>&1
}

pre_remove() {
  _stop_services

  /usr/lib/snapd/snap-mgmt --purge || :
}

pre_upgrade() {
  _stop_services
}

post_upgrade() {
  /usr/bin/systemctl daemon-reload > /dev/null 2>&1 || :

  # restore the services after an upgrade
  if /usr/bin/systemctl -q is-enabled snapd.socket > /dev/null 2>&1;
then
    /usr/bin/systemctl start snapd.socket > /dev/null 2>&1 || :
  fi
  if systemctl -q is-enabled snapd.refresh.timer > /dev/null 2>&1; then
    systemctl start snapd.refresh.timer > /dev/null 2>&1 || :
  fi
}

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