#!/usr/bin/env bash
# Copyright 2014, Rackspace US, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

## Shell Opts ----------------------------------------------------------------
set -e -u


## Library Check -------------------------------------------------------------
info_block "Checking for required libraries." 2> /dev/null || source $(dirname ${0})/scripts-library.sh

## Confirmation -------------------------------------------------------------
cat <<EOF
-----------------------------------------------------------------------------
WARNING: This is a destructive action.
         All containers will be destroyed as well as the data within the
         containers (even if the containers are added by users and not by
         AIO). Data will be removed from the host as well (e.g. files, apt
         packages and pip packages). Please check this script for information
         about the data to be removed in removed_(files/packages/pip-packages).
         /etc/openstack_deploy will be preserved and may be manually removed
         if needed.
         ALL the data stored in the lvm volume group called "lxc" WILL BE
         DELETED as well (even if volumes are created by users and not AIO).
         Please verify that you have backed up all important data prior to
         proceeding with the teardown script.
-----------------------------------------------------------------------------
To REALLY destroy all containers and delete all data mentioned above,
type 'Y' or 'y' and press enter:
EOF

read -r
echo
if [[ ! $REPLY =~ ^[Yy]$ ]]; then
    echo "Teardown canceled."
    exit 1
fi

## Main ----------------------------------------------------------------------
info_block "Running Teardown"

pushd playbooks
  KNOWN_HOSTS=$(ansible hosts --list-hosts) || true
  if [ -z "${KNOWN_HOSTS}" ];then
    ANSIBLE_DESTROY_HOSTS="localhost"
  else
    ANSIBLE_DESTROY_HOSTS="hosts"
  fi
  # Create the destroy play
  cat > /tmp/destroy_play.yml <<EOF
- name: Destruction of openstack
  hosts: "${ANSIBLE_DESTROY_HOSTS}"
  gather_facts: false
  user: root
  tasks:
    - name: Get containers
      command: lxc-ls
      register: onlinecontainers
      failed_when: false
    - name: Destroy containers
      command: lxc-destroy -fn "{{ item }}"
      with_items: onlinecontainers.stdout_lines
      when: onlinecontainers.rc == 0 and onlinecontainers.stdout

    - name: Shutdown the lxc bridge
      shell: |
        ifdown {{ item }} || true
      with_items: shut_interfaces_down
    - name: Lxc system manage shutdown
      shell: |
        lxc-system-manage system-force-tear-down || true
        lxc-system-manage veth-cleanup || true
      failed_when: false

    - name: Get os service script
      shell: |
        ls /etc/init | grep -e nova -e swift -e neutron -e haproxy
      failed_when: false
      register: servicenames
    - name: Stop services
      service:
        name: "{{ item.split('.')[0] }}"
        state: "stopped"
        enabled: no
      failed_when: false
      with_items: servicenames.stdout_lines
      when: servicenames.stdout
    - name: Remove init scripts
      shell: |
        rm "/etc/init/{{ item }}"
      with_items: servicenames.stdout_lines
      when: servicenames.stdout

    - name: Get pip packages
      shell: |
        pip freeze | grep -i {% for i in remove_pip_packages %} -e {{ i }}{% endfor %}
      register: pippackages
      failed_when: false
    - name: Remove python packages
      pip:
        name: "{{ item }}"
        state: "absent"
      with_items: pippackages.stdout_lines
      when: pippackages.stdout

    - name: Remove packages
      apt:
        name: "{{ item }}"
        state: "absent"
      with_items: remove_packages
      failed_when: false

    - name: Clean up apt cruft
      shell: |
        apt-get autoremove --yes || true
      failed_when: false

    - name: Get all logical volumes
      shell: >
        lvs | awk '/lxc/ || /cinder/ || /swift/ {print \$1","\$2}'
      register: lvstorage
      failed_when: false
    - name: Remove all logical volumes
      lvol:
        vg: "{{ item.split(',')[1] }}"
        lv: "{{ item.split(',')[0] }}"
        state: "absent"
        force: "yes"
      with_items: lvstorage.stdout_lines
      failed_when: false
      when: lvstorage.stdout

    - name: Get all dm storage devices
      shell: >
        dmsetup info | awk '/lxc/ || /cinder/ || /swift/ {print \$2}'
      register: dmstorage
      failed_when: false
    - name: Remove dm storage entries
      command: dmsetup remove "{{ item }}"
      with_items: dmstorage.stdout_lines
      when: dmstorage.stdout

    - name: Get all loopback storage devices
      shell: >
        losetup -a | awk -F':' '{print \$1}'
      register: lostorage
      failed_when: false
    - name: Unmount loopback storage
      shell: |
        umount {{ item }} || true
        losetup -d {{ item }} || true
      with_items: lostorage.stdout_lines
      when: lostorage.stdout
      failed_when: false

    - name: Remove known AIO mount points (fstab)
      lineinfile:
        dest: "/etc/fstab"
        state: "absent"
        regexp: "{{ item }}.*.img"
      with_items: aio_mount_points

    - name: Remove known AIO mount points (rc.local)
      lineinfile:
        dest: "/etc/rc.local"
        state: "absent"
        regexp: "{{ item }}.*.img"
      with_items: aio_mount_points

    - name: Stop all swap
      command: "swapoff -a"
      failed_when: false

    - name: Remove known files and folders.
      shell: |
        rm -rf {{ item }}
      failed_when: false
      with_items: remove_files
  vars:
    aio_mount_points:
      - cinder
      - swap
      - swift
    shut_interfaces_down:
      - lxcbr0
    remove_files:
      - /etc/haproxy
      - /etc/nova
      - /etc/network/interfaces.d/aio_interfaces.cfg
      - /etc/neutron
      - /etc/openstack_deploy/ansible_facts
      - /etc/swift
      - /openstack
      - /opt/*.img
      - /opt/*lxc*
      - /opt/*neutron*
      - /opt/*nova*
      - /opt/*pip*
      - /opt/*repo*
      - /root/.pip
      - /var/lib/neutron
      - /var/lib/nova
      - /var/lib/mongodb
      - /var/log/mongodb
      - /var/log/swift
      - /var/log/neutron
      - /var/log/nova
    remove_packages:
      - haproxy
      - hatop
      - liblxc1
      - libvirt0
      - libvirt-bin
      - lxc
      - lxc-dev
      - vim-haproxy
      - mongodb-server
      - mongodb-clients
      - python-pymongo
    remove_pip_packages:
      - cinder
      - eventlet
      - euca2ools
      - glance
      - heat
      - keystone
      - kombu
      - lxc
      - lxml
      - mysql
      - neutron
      - nova
      - oslo
      - Paste
      - pbr
      - pymongo
      - repoze
      - six
      - sql
      - swift
      - turbolift
      - warlock
EOF

  # Destroy all of the known stuff.
  if [ "${ANSIBLE_DESTROY_HOSTS}" == "localhost" ];then
    echo -e '[all]\nlocalhost ansible_connection=local' | tee /tmp/localhost
    openstack-ansible -i /tmp/localhost /tmp/destroy_play.yml --forks ${FORKS} || true
    # Since this is an AIO, just remove it from the local hosts file
    sed -i '/_container-/d' /etc/hosts
  else
    openstack-ansible lxc-containers-destroy.yml --forks ${FORKS} || true
    openstack-ansible /tmp/destroy_play.yml --forks ${FORKS} || true
    # Remove containers from /etc/hosts on physical hosts
    ansible hosts -m shell -a "sed -i '/_container-/d' /etc/hosts"
  fi
popd

# Remove the temp destruction play
rm /tmp/destroy_play.yml &>/dev/null || true
rm /tmp/localhost &>/dev/null || true

# Final message
get_instance_info
info_block "* NOTICE *"
echo -e "The system has been torn down."
echo -e "Make sure you update and/or review the file '/etc/fstab'."
if [ ! -z "${KNOWN_HOSTS}" ];then
  echo -e "The following hosts has been touched: \"${KNOWN_HOSTS}\""
fi
echo -e "Entries may need to be updated."