source: nutchez-0.2/src/shell/master_remove @ 232

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

source /home/nutchuser/nutchez/system/lang_link

##########  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 ##########

nutch_PATH=/home/nutchuser/nutchez/system


# check root
function check_root(){
  debug_info "check_root"
  if [ $USER != "root" ]; then
    show_info "$MR_check_root_1" # "請切換成 root 身份執行移除程式!!!"
    exit
  fi
  show_info "$MR_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 "$MR_shutdown_service_echo_1" # "停止其他尚未關閉的slaves服務..."
  slaves_list=`cat $nutch_PATH'/nutch_nodes' | cut -d' ' -f1`
  
  for nutch_node in $slaves_list
  do
    show_info "驗證叢集狀態"
#   TaskTrackerStatus=`ssh -o StrictHostKeyChecking=no $nutch_node "jps |grep TaskTracker |sed 's/[0-9]* //g'"`
#   DataNodeStatus=`ssh -o StrictHostKeyChecking=no $nutch_node "jps |grep DataNode |sed 's/[0-9]* //g'"`

    if [ $(ssh -o StrictHostKeyChecking=no nutchuser@$nutch_node "jps |grep TaskTracker |sed 's/[0-9]* //g'") == "TaskTracker" ]; then
       show_info "TaskTracker@$nutch_node is running, we will shutdown it!"
       su nutchuser -c "ssh nutchuser@$nutch_node /opt/nutchez/nutch/bin/hadoop-daemon.sh stop tasktracker"
    fi

    if [ $(ssh -o StrictHostKeyChecking=no nutchuser@$nutch_node "jps |grep DataNode |sed 's/[0-9]* //g'") == "DataNode" ]; then
       show_info "DataNode@$nutch_node is running, we will shutdown it!"
       show_info "Shutdown $nutch_node."
       su nutchuser -c "ssh nutchuser@$nutch_node /opt/nutchez/nutch/bin/hadoop-daemon.sh stop datanode"
    fi
  done
  show_info "$MR_shutdown_service_echo_2" # "關閉本機服務..."
  su nutchuser -c "/opt/nutchez/nutch/bin/stop-all.sh"
  su nutchuser -c "/opt/nutchez/tomcat/bin/shutdown.sh"
  show_info "$MR_shutdown_service_echo_3" # "本機服務已關閉"
}

# 移除檔案及資料夾
function remove_folders () {
  rm /usr/local/bin/nutchez
  show_info "$MR_remove_folders_echo_1" # "正在刪除安裝時所建立的檔案及資料夾..."
  rm -rf /opt/nutchez
  rm -rf /var/nutchez
  show_info "$MR_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 "$MR_edit_hosts_echo_1" # "修改/etc/hosts..."
#  slaves_list=`cat $nutch_PATH'/nutch_nodes' | cut -d' ' -f1`
#  for nutch_node in $slaves_list
#  do
#    Line_NO=`cat /etc/hosts | grep -n $nutch_node | sed 's/:.*//g'`
#    if [[ $Line_NO -ge 1 ]]; then
#      sed -i ''$Line_NO'd' /etc/hosts
#    fi
#  done
  cat > /etc/hosts < /home/nutchuser/nutchez/system/hosts.bak
  show_info "$MR_edit_hosts_echo_2" # "完成修改/etc/hosts"
}

# 移除使用者
function user_delete () {
  show_info "$MR_user_delete_echo_1" # "正在刪除nutchuser使用者..."
  userdel -rf nutchuser
  show_info "$MR_user_delete_echo_2" # "使用者nutchuser已刪除"
}

# Main function
function main () {
  check_root
  show_info "$MR_main_echo_1" #"警告 - 此一程式為移除nutchEZ程式, 若您為誤執行此一程式, 請按Ctrl+c離開此程序！"
  show_info "$MR_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 "$MR_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 [ $confirm -eq 1 ]; then
    shutdown_service
    remove_folders
    edit_hosts
    user_delete
    show_info "$MR_main_echo_4" # "移除程序已完成！"
  elif [ $confirm -eq 2 ]; then
    show_info "$MR_main_echo_5" # "您已取消移除程序！"
    show_info "$MR_main_echo_6" # "若要移除請再重新執行！"
  fi
}

main