source: nutchez-0.2/src/shell/client_remove @ 244

#!/bin/bash
# Program:
#   remove shell script for client uninstall
# Author:
#   Waue, Shunfa, Rock {waue, shunfa, rock}@nchc.org.tw
# Version:
#    1.0
# History:
#    


# 需要 master_install 設定的參數區
# Master IP here
Master_IP_Address=input.your.master.ip_address
# Master Hostname here
Master_Hostname=input_your_master_hostname

##########  echo function  ##########
function debug_info () {
  if [ $? -eq 0 ]; then
    echo -e "\033[1;35;40m info - $1 \033[0m"
  fi
}


function show_info () {
  if [ $? -eq 0 ]; then
    echo -e "\033[1;32;40m $1 \033[0m"
  fi
}
##########end echo function ##########

function load_default_lang(){

lang=$(locale | grep 'LANG=' | cut -d "=" -f2)

# Default: source english
. lang/lang_en_US
# if locale is zh then source chinese

echo $lang | grep 'zh' >> /dev/null && source lang/lang_zh_TW
}



# check root
function check_root(){
  debug_info "check_root"
  if [ $USER != "root" ]; then
    show_info "$CR_check_root_1" # "請切換成 root 身份執行移除程式!!!"
    exit
  fi
  show_info "$CR_check_root_2" # "已確認為root身份, 將繼續執行此移除程式！"
}

# shutdown service
function shutdown_service () {
  show_info "$CR_shutdown_service_echo_1" # "關閉本機服務..."
  su nutchuser -c "/opt/nutchez/nutch/bin/hadoop-daemon.sh stop datanode"
  su nutchuser -c "/opt/nutchez/nutch/bin/hadoop-daemon.sh stop tasktracker"
  show_info "$CR_shutdown_service_echo_2" # "本機服務已關閉"
}

# 移除檔案及資料夾
function remove_folders () {
  show_info "$CR_remove_folders_echo_1" # "正在刪除安裝時所建立的檔案及資料夾..."
  rm -rf /opt/nutchez
  rm -rf /var/nutchez
  show_info "$CR_remove_folders_echo_2" # "安裝時所建立的檔案及資料夾已刪除"
}


# 還原/etc/hosts
function edit_hosts () {
  show_info "$CR_edit_hosts_echo_1" # "修改/etc/hosts..."
#  Line_NO=`cat /etc/hosts | grep -n $Master_IP_Address | sed 's/:.*//g'`
#  if [[ $Line_NO -ge 1 ]]; then
#    sed -i ''$Line_NO'd' /etc/hosts
#  fi
  cat > /etc/hosts < /home/nutchuser/nutchez/system/hosts.bak
  show_info "$CR_edit_hosts_echo_2" # "完成修改/etc/hosts"
}


# 移除使用者
function user_delete () {
  show_info "$CR_user_delete_echo_1" # "正在刪除nutchuser使用者..."
  userdel -r nutchuser
  show_info "$CR_user_delete_echo_2" # "使用者nutchuser已刪除"
}

# Main function
function main () {
  load_default_lang
  check_root
  show_info "$CR_main_echo_1" #"警告 - 此一程式為移除此用戶端的nutch node, 若您為誤執行此一程式, 請按Ctrl+c離開此程序！"
  show_info "$CR_main_echo_2" #"本執行程序將會移除安裝nutchEZ時所新增的檔案及nutchuser使用者帳號"
# 詢問是否繼續
  read -p "$CR_main_echo_3" confirm # "請問是否確定移除此一節點：1.確定 2.取消"
# 確認移除
  if [ $confirm -eq 1 ]; then
    shutdown_service
    remove_folders
    edit_hosts
    user_delete
    show_info "$CR_main_echo_4" # "移除程序已完成！"
  elif [ $confirm -eq 2 ]; then
    show_info "$CR_main_echo_5" # "您已取消移除程序！"
    show_info "$CR_main_echo_6" # "若要移除請再重新執行！"
  fi
}

main