#!/bin/bash
#
# Init file for Password Download Client
#
# chkconfig: 345 98 02
# description: Password Download Client

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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.


# Modify this line to specify the user (default is root)
user=root

mountdir=$(mktemp -d)

# If lable name is other than config, please change the below line as required
DefaultDisk=/dev/disk/by-label/config-2


Password_File=$mountdir/cloudstack/password/vm_password.txt
password_received=0

function prepare_mount
{
    if [ ! -e $mountdir ]; then
        mkdir $mountdir
        chmod 700 $mountdir
    fi

    if [ -e $DefaultDisk ]; then
        Disk=$DefaultDisk
    else
        BLOCK_DEVICE=$(blkid -t LABEL='config' /dev/hd? /dev/sd? /dev/xvd? /dev/vd? -o device)
        if [ -n $BLOCK_DEVICE ]; then
            Disk=$BLOCK_DEVICE
        else
            logger -t "cloud" "Unable to set password to VM: Config drive not found"
            exit 1
        fi
    fi

    mount -r $Disk $mountdir
    if [ $? -ne 0 ]; then
        echo "Failed mounting $Disk to /mnt/configdrive"
        exit 1
    fi
}

function remove_mount
{
  umount $mountdir
}

prepare_mount


if [ -f $Password_File ]
then
    password=$(cat $Password_File)
    password=$(echo $password | tr -d '\r')
    remove_mount

    case $password in

        "")                 logger -t "cloud" "Config drive did not have any password for the VM"
                            exit 0
                            ;;

        "saved_password")   logger -t "cloud" "VM has already saved a password"
                            exit 0
                            ;;

        *)                  logger -t "cloud" "VM got a valid password"
                            password_received=1
                            ;;
        esac
else
    remove_mount
    logger -t "cloud" "Password set failed on VM: password file not found in config drive"
    exit 0
fi

if [ "$password_received" = "1" ]; then

   newmd5sum=$(echo $password | md5sum | awk '{print $1}')
   if [ -f /var/vmpasswordmd5sum ]
   then
       oldsum=$(cat /var/vmpasswordmd5sum)

       if [ "$newmd5sum" ==  "$oldsum" ]
       then
           logger -t "cloud"  "There is no update of VM password from cloudstack, returning true"
           exit 0
       fi
   fi

    logger -t "cloud" "Changing password ..."
    echo $user:$password | chpasswd

    if [ $? -gt 0 ]
    then
        usermod -p `mkpasswd -m SHA-512 $password` $user

        if [ $? -gt 0 ]
        then
            logger -t "cloud" "Failed to change password for user $user"
            exit 1
        else
            logger -t "cloud" "Successfully changed password for user $user"
        fi
    fi
fi

 echo $newmd5sum > /var/vmpasswordmd5sum
exit 0