#!/bin/bash
# Evernode host setup tool to manage Sashimono installation and host registration.
# This script is also used as the 'evernode' cli alias after the installation.
# usage: ./setup.sh install

# surrounding braces  are needed make the whole script to be buffered on client before execution.
{

evernode="Evernode Beta v2"
maxmind_creds="687058:FtcQjM0emHFMEfgI"
cgrulesengd_default="cgrulesengd"
alloc_ratio=80
ramKB_per_instance=524288
instances_per_core=3
evernode_alias=/usr/bin/evernode
log_dir=/tmp/evernode-beta
cloud_storage="https://stevernode.blob.core.windows.net/evernode-beta"
setup_script_url="$cloud_storage/setup.sh"
installer_url="$cloud_storage/installer.tar.gz"
licence_url="$cloud_storage/licence.txt"
nodejs_url="$cloud_storage/node"
jshelper_url="$cloud_storage/setup-jshelper.tar.gz"
installer_version_timestamp_file="installer.version.timestamp"
setup_version_timestamp_file="setup.version.timestamp"
default_rippled_server="wss://hooks-testnet-v2.xrpl-labs.com"
setup_helper_dir="/tmp/evernode-setup-helpers"
nodejs_temp_bin="$setup_helper_dir/node"
jshelper_temp_bin="$setup_helper_dir/jshelper/index.js"

# export vars used by Sashimono installer.
export USER_BIN=/usr/bin
export SASHIMONO_BIN=/usr/bin/sashimono
export MB_XRPL_BIN=$SASHIMONO_BIN/mb-xrpl
export DOCKER_BIN=$SASHIMONO_BIN/dockerbin
export SASHIMONO_DATA=/etc/sashimono
export MB_XRPL_DATA=$SASHIMONO_DATA/mb-xrpl
export SASHIMONO_SERVICE="sashimono-agent"
export CGCREATE_SERVICE="sashimono-cgcreate"
export MB_XRPL_SERVICE="sashimono-mb-xrpl"
export SASHIADMIN_GROUP="sashiadmin"
export SASHIUSER_GROUP="sashiuser"
export SASHIUSER_PREFIX="sashi"
export MB_XRPL_USER="sashimbxrpl"
export CG_SUFFIX="-cg"
export EVERNODE_REGISTRY_ADDRESS="r3cNR2bdao1NyvQ5ZuQvCUgqkoWGmgF34E"
export EVERNODE_AUTO_UPDATE_SERVICE="evernode-auto-update"
export MIN_EVR_BALANCE=5120

# Private docker registry (not used for now)
export DOCKER_REGISTRY_USER="sashidockerreg"
export DOCKER_REGISTRY_PORT=0

# We execute some commands as unprivileged user for better security.
# (we execute as the user who launched this script as sudo)
noroot_user=${SUDO_USER:-$(whoami)}

# Helper to print multi line text.
# (When passed as a parameter, bash auto strips spaces and indentation which is what we want)
function echomult() {
    echo -e $1
}

function confirm() {
    echo -en $1" [Y/n] "
    local yn=""
    read yn </dev/tty

    # Default choice is 'y'
    [ -z $yn ] && yn="y"
    while ! [[ $yn =~ ^[Yy|Nn]$ ]]; do
        read -p "'y' or 'n' expected: " yn </dev/tty
    done

    echo "" # Insert new line after answering.
    [[ $yn =~ ^[Yy]$ ]] && return 0 || return 1  # 0 means success.
}

# Configuring the sashimono service is the last stage of the installation.
# Removing the sashimono service is the first stage of ununstallation.
# So if the service exists, Previous sashimono installation has been complete.
# Creating bin dir is the first stage of installation.
# Removing bin dir is the last stage of uninstalltion.
# So if the service does not exists but the bin dir exists, Previous installation or uninstalltion is failed partially.
if [ -f /etc/systemd/system/$SASHIMONO_SERVICE.service ] && [ -d $SASHIMONO_BIN ] ; then
    [ "$1" == "install" ] \
        && echo "$evernode is already installed on your host. Use the 'evernode' command to manage your host." \
        && exit 1

    [ "$1" != "uninstall" ] && [ "$1" != "status" ] && [ "$1" != "list" ] && [ "$1" != "update" ] && [ "$1" != "log" ] && [ "$1" != "applyssl" ] && [ "$1" != "transfer" ] && [ "$1" != "config" ] &&  [ "$1" != "delete" ] \
        && echomult "$evernode host management tool
                \nYour host is registered on $evernode.
                \nSupported commands:
                \nstatus - View $evernode registration info
                \nlist - View contract instances running on this system
                \nlog - Generate evernode log file.
                \napplyssl - Apply new SSL certificates for contracts.
                \nconfig - View and update host configuration.
                \nupdate - Check and install $evernode software updates
                \ntransfer - Initiate an $evernode transfer for your machine
                \ndelete - Remove an instance from the system and recreate the lease
                \nuninstall - Uninstall and deregister from $evernode" \
        && exit 1
elif [ -d $SASHIMONO_BIN ] ; then
    [ "$1" != "install" ] && [ "$1" != "uninstall" ] \
        && echomult "$evernode host management tool
                \nYour system has a previous failed partial $evernode installation.
                \nYou can repair previous $evernode installation by installing again.
                \nSupported commands:
                \nuninstall - Uninstall previous $evernode installation" \
        && exit 1

    # If partially installed and interactive mode, Allow user to repair.
    [ "$2" != "-q" ]  && [ "$1" == "install" ] \
        && ! confirm "$evernode host management tool
                \nYour system has a previous failed partial $evernode installation.
                \nYou can run:
                \nuninstall - Uninstall previous $evernode installation.
                \n\nDo you want to repair previous $evernode installation?" \
        && exit 1
else
    [ "$1" != "install" ] \
        && echomult "$evernode host management tool
                \nYour system is not registered on $evernode.
                \nSupported commands:
                \ninstall - Install Sashimono and register on $evernode"\
        && exit 1
fi
mode=$1

if [ "$mode" == "install" ] || [ "$mode" == "uninstall" ] || [ "$mode" == "update" ] || [ "$mode" == "log" ] || [ "$mode" == "transfer" ] ; then
    [ -n "$2" ] && [ "$2" != "-q" ] && [ "$2" != "-i" ] && echo "Second arg must be -q (Quiet) or -i (Interactive)" && exit 1
    [ "$2" == "-q" ] && interactive=false || interactive=true
    [ "$mode" == "transfer" ] && transfer=true || transfer=false
    [ "$EUID" -ne 0 ] && echo "Please run with root privileges (sudo)." && exit 1
fi

# Format the given KB number into GB units.
function GB() {
    echo "$(bc <<<"scale=2; $1 / 1000000") GB"
}

function check_prereq() {
    # Check if node js installed.
    if command -v node &>/dev/null; then
        version=$(node -v | cut -d '.' -f1)
        version=${version:1}
        if [[ $version -lt 16 ]]; then
            echo "$evernode requires NodeJs 16.x or later. You system has NodeJs $version installed. Either remove the NodeJs installation or upgrade to NodeJs 16.x."
            exit 1
        fi
    fi
}

function check_sys_req() {

    # Assign sys resource info to global vars since these will also be used for instance allocation later.
    ramKB=$(free | grep Mem | awk '{print $2}')
    swapKB=$(free | grep Swap | awk '{print $2}')
    diskKB=$(df | grep -w /home | head -1 | awk '{print $4}')
    [ -z "$diskKB" ] && diskKB=$(df | grep -w / | head -1 | awk '{print $4}')

    [ "$SKIP_SYSREQ" == "1" ] && echo "System requirements check skipped." && return 0

    local proc1=$(ps --no-headers -o comm 1)
    if [ "$proc1" != "systemd" ]; then
        echo "$evernode host installation requires systemd. Your system does not have systemd running. Aborting."
        exit 1
    fi

    local os=$(grep -ioP '^ID=\K.+' /etc/os-release)
    local osversion=$(grep -ioP '^VERSION_ID=\K.+' /etc/os-release)

    local errors=""
    ([ "$os" != "ubuntu" ] || [ "$osversion" != '"20.04"' ]) && errs=" OS: $os $osversion (required: Ubuntu 20.04)\n"
    [ $ramKB -lt 2000000 ] && errors="$errors RAM: $(GB $ramKB) (required: 2 GB RAM)\n"
    [ $swapKB -lt 2000000 ] && errors="$errors Swap: $(GB $swapKB) (required: 2 GB Swap)\n"
    [ $diskKB -lt 4000000 ] && errors="$errors Disk space (/home): $(GB $diskKB) (required: 4 GB)\n"

    if [ -z "$errors" ]; then
        echo "System check complete. Your system is capable of becoming an $evernode host."
    else
        echomult "Your system does not meet following $evernode system requirements:\n $errors"
        echomult "$evernode host registration requires Ubuntu 20.04 with minimum 2 GB RAM,
            2 GB Swap and 4 GB free disk space for /home. Aborting setup."
        exit 1
    fi
}

function init_setup_helpers() {

    echo "Downloading setup support files..."

    local jshelper_dir=$(dirname $jshelper_temp_bin)
    rm -r $jshelper_dir >/dev/null 2>&1
    sudo -u $noroot_user mkdir -p $jshelper_dir

    [ ! -f "$nodejs_temp_bin" ] && sudo -u $noroot_user curl $nodejs_url --output $nodejs_temp_bin
    [ ! -f "$nodejs_temp_bin" ] && echo "Could not download nodejs for setup checks." && exit 1
    chmod +x $nodejs_temp_bin

    if [ ! -f "$jshelper_temp_bin" ]; then
        pushd $jshelper_dir >/dev/null 2>&1
        sudo -u $noroot_user curl $jshelper_url --output jshelper.tar.gz
        sudo -u $noroot_user tar zxf jshelper.tar.gz --strip-components=1
        rm jshelper.tar.gz
        popd >/dev/null 2>&1
    fi
    [ ! -f "$jshelper_temp_bin" ] && echo "Could not download helper tool for setup checks." && exit 1
    echo -e "Done.\n"
}

function exec_jshelper() {

    # Create fifo file to read response data from the helper script.
    local resp_file=$setup_helper_dir/helper_fifo
    [ -p $resp_file ] || sudo -u $noroot_user mkfifo $resp_file

    # Execute js helper asynchronously while collecting response to fifo file.
    sudo -u $noroot_user RESPFILE=$resp_file $nodejs_temp_bin $jshelper_temp_bin "$@" >/dev/null 2>&1 &
    local pid=$!
    local result=$(cat $resp_file) && [ "$result" != "-" ] && echo $result
    
    # Wait for js helper to exit and reflect the error exit code in this function return.
    wait $pid && [ $? -eq 0 ] && rm $resp_file && return 0
    rm $resp_file && return 1
}

function resolve_filepath() {
    # name reference the variable name provided as first argument.
    local -n filepath=$1
    local option=$2
    local prompt="${*:3} "

    while [ -z "$filepath" ]; do
        read -p "$prompt" filepath </dev/tty

        # if optional accept empty path as "-"
        [ "$option" == "o" ] && [ -z "$filepath" ] && filepath="-"
        
        # Check for valid path.
        ([ "$option" == "r" ] || ([ "$option" == "o" ] && [ "$filepath" != "-" ])) \
            && [ ! -f "$filepath" ] && echo "Invalid file path" && filepath=""
    done
}

function set_domain_certs() {
    if confirm "\n$evernode can automatically setup free SSL certificates and renewals for '$inetaddr'
            using Let's Encrypt (https://letsencrypt.org/).
            \nDo you want to setup Let's Encrypt automatic SSL (recommended)?" && \
        confirm "Do you agree to have Let's Encrypt send SSL certificate notifications to your email '$email_address' (required)?" && \
        confirm "Do you agree with Let's Encrypt Terms of Service at https://letsencrypt.org/documents/LE-SA-v1.3-September-21-2022.pdf ?" ; then
            
        tls_key_file="letsencrypt"
        tls_cert_file="letsencrypt"
        tls_cabundle_file="letsencrypt"
    else

        echomult "You have opted out of automatic SSL setup. You need to have obtained SSL certificate files for '$inetaddr'
            from a trusted authority. Please specify the certificate files you have obtained below.\n"

        resolve_filepath tls_key_file r "Please specify location of the private key (usually ends with .key):"
        resolve_filepath tls_cert_file r "Please specify location of the certificate (usually ends with .crt):"
        resolve_filepath tls_cabundle_file o "Please specify location of ca bundle (usually ends with .ca-bundle [Optional]):"
    fi
    return 0
}

function validate_inet_addr_domain() {
    host $inetaddr >/dev/null 2>&1 && return 0
    inetaddr="" && return 1
}

function validate_inet_addr() {
    # inert address cannot be empty and cannot contain spaces.
    [ -z "$inetaddr" ] || [[ $inetaddr = *" "* ]] && inetaddr="" && return 1

    # Attempt to resolve ip (in case inetaddr is a DNS address)
    # This will resolve correctly if inetaddr is a valid ip or dns address.
    local resolved=$(getent hosts $inetaddr | head -1 | awk '{ print $1 }')
    # If invalid, reset inetaddr and return with non-zero code.
    [ -z "$resolved" ] && inetaddr="" && return 1

    return 0
}

function validate_positive_decimal() {
    ! [[ $1 =~ ^(0*[1-9][0-9]*(\.[0-9]+)?|0+\.[0-9]*[1-9][0-9]*)$ ]] && return 1
    return 0
}

function validate_rippled_url() {
    ! [[ $1 =~ ^(wss?:\/\/)([^\/|^:|^ ]{3,})(:([0-9]{1,5}))?$ ]] && echo "Rippled URL must be a valid URL that starts with 'wss://'" && return 1

    echo "Checking server $1..."
    ! exec_jshelper validate-server $1 && echo "Could not communicate with the rippled server." && return 1
    return 0
}

function set_inet_addr() {

    if $interactive && [ "$NO_DOMAIN" == "" ] ; then
        echo ""
        while [ -z "$inetaddr" ]; do
            read -p "Please specify the domain name that this host is reachable at: " inetaddr </dev/tty
            validate_inet_addr && validate_inet_addr_domain && set_domain_certs && return 0
            echo "Invalid or unreachable domain name."
        done
    fi

    # Rest of this function flow will be used for debugging and internal testing puposes only.

    tls_key_file="self"
    tls_cert_file="self"
    tls_cabundle_file="self"

    # Attempt auto-detection.
    if [ "$inetaddr" == "auto" ] || $interactive ; then
        inetaddr=$(hostname -I | awk '{print $1}')
        validate_inet_addr && $interactive && confirm "Detected ip address '$inetaddr'. This needs to be publicly reachable over
                                internet.\n\nIs this the ip address you want others to use to reach your host?" && return 0
        $interactive && inetaddr=""
    fi

    if $interactive ; then
        while [ -z "$inetaddr" ]; do
            read -p "Please specify the public ip/domain address your server is reachable at: " inetaddr </dev/tty
            validate_inet_addr && return 0
            echo "Invalid ip/domain address."
        done
    fi

    ! validate_inet_addr && echo "Invalid ip/domain address" && exit 1
}

function check_port_validity() {
    # Port should be a number and between 1 through 65535.
    # 1 through 1023 are used by system-supplied TCP/IP applications.
    [[ $1 =~ ^[0-9]+$ ]] && [ $1 -ge 1024 ] && [ $1 -le 65535 ] && return 0
    return 1
}

function set_init_ports() {

    # Take default ports in interactive mode or if 'default' is specified.
    # Picked default ports according to https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
    # (22223 - 23073) and (26000 - 26822) range is uncommon.
    ([ "$init_peer_port" == "default" ] || $interactive) && init_peer_port=22861
    ([ "$init_user_port" == "default" ] || $interactive) && init_user_port=26201

    if $interactive ; then

        if [ -n "$init_peer_port" ] && [ -n "$init_user_port" ] && confirm "Selected default port ranges (Peer: $init_peer_port-$((init_peer_port + alloc_instcount)), User: $init_user_port-$((init_user_port + alloc_instcount))).
                                            This needs to be publicly reachable over internet. \n\nAre these the ports you want to use?" ; then
            return 0
        fi

        init_peer_port=""
        init_user_port=""
        while [ -z "$init_peer_port" ]; do
            read -p "Please specify the starting port of the public 'Peer port range' your server is reachable at: " init_peer_port </dev/tty
            ! check_port_validity $init_peer_port && init_peer_port="" && echo "Invalid port."
        done
        while [ -z "$init_user_port" ]; do
            read -p "Please specify the starting port of the public 'User port range' your server is reachable at: " init_user_port </dev/tty
            ! check_port_validity $init_user_port && init_user_port="" && echo "Invalid port."
        done

    else
        [ -z "$init_peer_port" ] && echo "Invalid starting peer port '$init_peer_port'" && exit 1
        [ -z "$init_user_port" ] && echo "Invalid starting user port '$init_user_port'" && exit 1
    fi
}

# Validate country code and convert to uppercase if valid.
function resolve_countrycode() {
    # If invalid, reset countrycode and return with non-zero code.
    if ! [[ $countrycode =~ ^[A-Za-z][A-Za-z]$ ]] ; then
        countrycode=""
        return 1
    else
        countrycode=$(echo $countrycode | tr 'a-z' 'A-Z')
        return 0
    fi
}

function set_country_code() {

    # Attempt to auto-detect in interactive mode or if 'auto' is specified.
    if [ "$countrycode" == "auto" ] || $interactive ; then
        echo "Checking country code..."
        echo "Using GeoLite2 data created by MaxMind, available from https://www.maxmind.com"

        # MaxMind needs a ip address to detect country code. DNS is not supported by it.
        # Use getent to resolve ip address in case inetaddr is a DNS name.
        local mxm_ip=$(getent hosts $inetaddr | head -1 | awk '{ print $1 }')
        # If getent fails (mxm_ip empty) for some reason, keep using inetaddr for MaxMind api call.
        [ -z "$mxm_ip" ] && mxm_ip="$inetaddr"

        local detected=$(curl -s -u "$maxmind_creds" "https://geolite.info/geoip/v2.1/country/$mxm_ip?pretty" | grep "iso_code" | head -1 | awk '{print $2}')
        countrycode=${detected:1:2}
        resolve_countrycode || echo "Could not detect country code."
    fi

    if $interactive ; then

        # Uncomment this if we want the user to manually change the auto-detected country code.
        # if [ -n "$countrycode" ] && ! confirm "Based on the internet address '$inetaddr' we have detected that your country
        #                                         code is '$countrycode'. Do you want to specify a different country code" ; then
        #     return 0
        # fi
        # countrycode=""

        while [ -z "$countrycode" ]; do
            # This will be asked if auto-detection fails or if user wants to specify manually.
            read -p "Please specify the two-letter country code where your server is located in (eg. AU): " countrycode </dev/tty
            resolve_countrycode || echo "Invalid country code."
        done

    else
        resolve_countrycode || (echo "Invalid country code '$countrycode'" && exit 1)
    fi
}

function set_cgrules_svc() {
    local filepath=$(grep "ExecStart.*=.*/cgrulesengd$" /etc/systemd/system/*.service | head -1 | awk -F : ' { print $1 } ')
    if [ -n "$filepath" ] ; then
        local filename=$(basename $filepath)
        cgrulesengd_service="${filename%.*}"
    fi
    # If service not detected, use the default name.
    [ -z "$cgrulesengd_service" ] && cgrulesengd_service=$cgrulesengd_default || echo "cgroups rules engine service found: '$cgrulesengd_service'"
}

function set_instance_alloc() {
    [ -z $alloc_ramKB ] && alloc_ramKB=$(( (ramKB / 100) * alloc_ratio ))
    [ -z $alloc_swapKB ] && alloc_swapKB=$(( (swapKB / 100) * alloc_ratio ))
    [ -z $alloc_diskKB ] && alloc_diskKB=$(( (diskKB / 100) * alloc_ratio ))
    [ -z $alloc_cpu ] && alloc_cpu=$(( (1000000 / 100) * alloc_ratio ))

    # If instance count is not specified, decide it based on some rules.
    if [ -z $alloc_instcount ]; then
        # Instance count based on total RAM
        local ram_c=$(( alloc_ramKB / ramKB_per_instance ))
        # Instance count based on no. of CPU cores.
        local cores=$(grep -c ^processor /proc/cpuinfo)
        local cpu_c=$(( cores * instances_per_core ))

        # Final instance count will be the lower of the two.
        alloc_instcount=$(( ram_c < cpu_c ? ram_c : cpu_c ))
    fi


    if $interactive; then
        echomult "Based on your system resources, we have chosen the following allocation:\n
                $(GB $alloc_ramKB) memory\n
                $(GB $alloc_swapKB) Swap\n
                $(GB $alloc_diskKB) disk space\n
                Distributed among $alloc_instcount contract instances"
        confirm "\nIs this the allocation you want to use?" && return 0

        local ramMB=0 swapMB=0 diskMB=0

        while true ; do
            read -p "Specify the number of contract instances that you wish to host: " alloc_instcount </dev/tty
            ! [[ $alloc_instcount -gt 0 ]] && echo "Invalid instance count." || break
        done

        while true ; do
            read -p "Specify the total memory in megabytes to distribute among all contract instances: " ramMB </dev/tty
            ! [[ $ramMB -gt 0 ]] && echo "Invalid memory size." || break
        done

        while true ; do
            read -p "Specify the total Swap in megabytes to distribute among all contract instances: " swapMB </dev/tty
            ! [[ $swapMB -gt 0 ]] && echo "Invalid swap size." || break
        done

        while true ; do
            read -p "Specify the total disk space in megabytes to distribute among all contract instances: " diskMB </dev/tty
            ! [[ $diskMB -gt 0 ]] && echo "Invalid disk size." || break
        done

        alloc_ramKB=$(( ramMB * 1000 ))
        alloc_swapKB=$(( swapMB * 1000 ))
        alloc_diskKB=$(( diskMB * 1000 ))
    fi

    if ! [[ $alloc_ramKB -gt 0 ]] || ! [[ $alloc_swapKB -gt 0 ]] || ! [[ $alloc_diskKB -gt 0 ]] ||
       ! [[ $alloc_cpu -gt 0 ]] || ! [[ $alloc_instcount -gt 0 ]]; then
        echo "Invalid allocation." && exit 1
    fi
}

function set_lease_amount() {

    # Lease amount is mandatory field set by the user
    if $interactive; then
        local amount=0
        while true ; do
            read -p "Specify the lease amount in EVRs for your contract instances (per moment charge per contract): " amount </dev/tty
            ! validate_positive_decimal $amount && echo "Lease amount should be a numerical value greater than zero." || break
        done

        lease_amount=$amount
    fi
}

function set_email_address() {
    if $interactive; then
        local emailAddress=""
        while true ; do
            read -p "Specify the contact email address (this will be published on the ledger): " emailAddress </dev/tty
            email_address_length=${#emailAddress}
            ( ( ! [[ "$email_address_length" -le 40 ]] && echo "Email address length should not exceed 40 characters." )  ||    
            ( ! [[ $emailAddress =~ .+@.+ ]] && echo "Email address is invalid." ) ) || break
        done

        email_address=$emailAddress
    fi

    non_interactive_email_address_length=${#email_address}
    ! ( ( ! [[ "$non_interactive_email_address_length" -le 40 ]] && echo "Email address length should not exceed 40 characters." )  ||    
    ( ! [[ $email_address =~ .+@.+ ]] && echo "Email address is invalid." ) ) || exit 1
}

function set_rippled_server() {
    ([ -z $rippled_server ] || [ "$rippled_server" == "default" ]) && rippled_server=$default_rippled_server

    if $interactive; then
        if confirm "Do you want to connect to the default rippled server ($default_rippled_server)?" ; then
            ! validate_rippled_url $rippled_server && exit 1
        else
            local new_url=""
            while true ; do
                read -p "Specify the Rippled server URL: " new_url </dev/tty
                ! validate_rippled_url $new_url || break
            done
            rippled_server=$new_url
        fi
    fi
}

function set_transferee_address() {
    # Here we set the default transferee address as 'CURRENT_HOST_ADDRESS', but we set it to the exact current host address in host client side.
    [ -z $transferee_address ] && transferee_address=''

    if $interactive; then
        confirm "\nDo you want to set the current host account as the transferee's account?" && return 0

        local address=''
        while true ; do
            read -p "Specify the XRPL account address of the transferee: " address </dev/tty
            ! [[ $address =~ ^r[a-zA-Z0-9]{24,34}$ ]] && echo "Invalid XRPL account address." || break

        done

        transferee_address=$address
    fi

    ! [[ $transferee_address =~ ^r[a-zA-Z0-9]{24,34}$ ]] && echo "Invalid XRPL account address." && exit 1
}


function set_host_xrpl_account() {

    if $interactive; then
        echomult "In order to register in Evernode you need to have an XRPL account with sufficient Ever (EVR) balance.\n"
        local xrpl_address=""
        local xrpl_secret=""
        while true ; do

            read -p "Specify the XRPL account address: " xrpl_address </dev/tty
            ! [[ $xrpl_address =~ ^r[0-9a-zA-Z]{24,34}$ ]] && echo "Invalid XRPL account address." && continue
            
            echo "Checking account $xrpl_address..."
            ! exec_jshelper validate-account $rippled_server $EVERNODE_REGISTRY_ADDRESS $xrpl_address && xrpl_address="" && continue

            # Take hidden input and print empty echo (new line) at the end.
            read -s -p "Specify the XRPL account secret (your input will be hidden on screen): " xrpl_secret </dev/tty && echo ""
            ! [[ $xrpl_secret =~ ^s[1-9A-HJ-NP-Za-km-z]{25,35}$ ]] && echo "Invalid XRPL account secret." && continue

            echo "Checking account keys..."
            ! exec_jshelper validate-keys $rippled_server $xrpl_address $xrpl_secret && xrpl_secret="" && continue

            break

        done

        xrpl_account_address=$xrpl_address
        xrpl_account_secret=$xrpl_secret
    fi
}

function install_failure() {
    echo "There was an error during installation. Please provide the file $logfile to Evernode team. Thank you."
    exit 1
}

function uninstall_failure() {
    echo "There was an error during uninstallation."
    exit 1
}

function online_version_timestamp() {
    # Send HTTP HEAD request and get last modified timestamp of the installer package or setup.sh.
    curl --silent --head $1 | grep 'Last-Modified:' | sed 's/[^ ]* //'
}

function install_evernode() {
    local upgrade=$1

    # Get installer version (timestamp). We use this later to check for Evernode software updates.
    local installer_version_timestamp=$(online_version_timestamp $installer_url)
    [ -z "$installer_version_timestamp" ] && echo "Online installer not found." && exit 1
    # Get setup version (timestamp).
    local setup_version_timestamp=$(online_version_timestamp $setup_script_url)

    local tmp=$(mktemp -d)
    cd $tmp
    curl --silent $installer_url --output installer.tgz
    tar zxf $tmp/installer.tgz --strip-components=1
    rm installer.tgz

    set -o pipefail # We need installer exit code to detect failures (ignore the tee pipe exit code).
    mkdir -p $log_dir
    logfile="$log_dir/installer-$(date +%s).log"

    if [ "$upgrade" == "0" ] ; then
        echo "Installing prerequisites..."
        ! ./prereq.sh $cgrulesengd_service 2>&1 \
                                | tee -a $logfile | stdbuf --output=L grep "STAGE" | cut -d ' ' -f 2- && install_failure
    fi

    # Create evernode cli alias at the begining.
    # So, if the installation attempt failed user can uninstall the failed installation using evernode commands.
    ! create_evernode_alias && install_failure

    # Adding ip address as the host description.
    # Currently the domain address saved only in account_info and an empty value in Hook states )
    description=""

    echo "Installing Sashimono on Evernode Beta V2 (Disabled Network)..."
    # Filter logs with STAGE prefix and ommit the prefix when echoing.
    # If STAGE log contains -p arg, move the cursor to previous log line and overwrite the log.
    ! UPGRADE=$upgrade ./sashimono-install.sh $inetaddr $init_peer_port $init_user_port $countrycode $alloc_instcount \
                            $alloc_cpu $alloc_ramKB $alloc_swapKB $alloc_diskKB $lease_amount $rippled_server $xrpl_account_address $xrpl_account_secret $email_address $tls_key_file $tls_cert_file $tls_cabundle_file $description 2>&1 \
                            | tee -a $logfile | stdbuf --output=L grep "STAGE\|ERROR" \
                            | while read line ; do [[ $line =~ ^STAGE[[:space:]]-p(.*)$ ]] && echo -e \\e[1A\\e[K"${line:9}" || echo ${line:6} ; done \
                            && remove_evernode_alias && install_failure
    set +o pipefail

    rm -r $tmp

    # Write the verison timestamp to a file for later updated version comparison.
    echo $installer_version_timestamp > $SASHIMONO_DATA/$installer_version_timestamp_file
    echo $setup_version_timestamp > $SASHIMONO_DATA/$setup_version_timestamp_file
}

function uninstall_evernode() {

    local upgrade=$1

    # Check for existing contract instances.
    local users=$(cut -d: -f1 /etc/passwd | grep "^$SASHIUSER_PREFIX" | sort)
    readarray -t userarr <<<"$users"
    local sashiusers=()
    for user in "${userarr[@]}"; do
        [ ${#user} -lt 24 ] || [ ${#user} -gt 32 ] || [[ ! "$user" =~ ^$SASHIUSER_PREFIX[0-9]+$ ]] && continue
        sashiusers+=("$user")
    done
    local ucount=${#sashiusers[@]}

    if [ "$upgrade" == "0" ] ; then
        $interactive && [ $ucount -gt 0 ] && ! confirm "This will delete $ucount contract instances. \n\nDo you still want to continue?" && exit 1
        ! $interactive && echo "$ucount contract instances will be deleted."
    fi

    if ! $transfer ; then
        [ "$upgrade" == "0" ] && echo "Uninstalling..." ||  echo "Uninstalling for upgrade..."
        ! UPGRADE=$upgrade TRANSFER=0 $SASHIMONO_BIN/sashimono-uninstall.sh $2 && uninstall_failure
    else
        echo "Intiating Transfer..."
        echo "Uninstalling for transfer..."
        ! UPGRADE=$upgrade TRANSFER=1 $SASHIMONO_BIN/sashimono-uninstall.sh $2 && uninstall_failure
    fi
    # Remove the evernode alias at the end.
    # So, if the uninstallation failed user can try uninstall again with evernode commands.
    remove_evernode_alias
}

function update_evernode() {
    echo "Checking for updates..."
    local latest_installer_script_version=$(online_version_timestamp $installer_url)
    local latest_setup_script_version=$(online_version_timestamp $setup_script_url)
    [ -z "$latest_installer_script_version" ] && echo "Could not check for updates. Online installer not found." && exit 1

    local current_installer_script_version=$(cat $SASHIMONO_DATA/$installer_version_timestamp_file)
    local current_setup_script_version=$(cat $SASHIMONO_DATA/$setup_version_timestamp_file)
    [ "$latest_installer_script_version" == "$current_installer_script_version" ] && [ "$latest_setup_script_version" == "$current_setup_script_version" ] && echo "Your $evernode installation is up to date." && exit 0

    echo "New $evernode update available. Setup will re-install $evernode with updated software. Your account and contract instances will be preserved."
    $interactive && ! confirm "\nDo you want to install the update?" && exit 1

    echo "Starting upgrade..."
    # Alias for setup.sh is created during 'install_evernode' too. 
    # If only the setup.sh is updated but not the installer, then the alias should be created again.
    if [ "$latest_installer_script_version" != "$current_installer_script_version" ] ; then
        uninstall_evernode 1
        install_evernode 1
    elif [ "$latest_setup_script_version" != "$current_setup_script_version" ] ; then
        [ -d $log_dir ] || mkdir -p $log_dir
        logfile="$log_dir/installer-$(date +%s).log"
        remove_evernode_alias
        ! create_evernode_alias && echo "Alias creation failed."
        echo $latest_setup_script_version > $SASHIMONO_DATA/$setup_version_timestamp_file
    fi

    echo "Upgrade complete."
}

function init_evernode_transfer() {

    if ! sudo -u $MB_XRPL_USER MB_DATA_DIR=$MB_XRPL_DATA node $MB_XRPL_BIN transfer $transferee_address &&
        [ "$force" != "-f" ] && [ -f $mb_service_path ]; then
            echo "Evernode transfer initiation was failed. Try again later." && exit 1
    fi

}

function create_log() {
    tempfile=$(mktemp /tmp/evernode.XXXXXXXXX.log)
    {
        echo "System:"
        uname -r
        lsb_release -a
        echo ""
        echo "sa.cfg:"
        cat "$SASHIMONO_DATA/sa.cfg"
        echo ""
        echo "mb-xrpl.cfg:"
        cat "$MB_XRPL_DATA/mb-xrpl.cfg"
        echo ""
        echo "Sashimono log:"
        journalctl -u sashimono-agent.service | tail -n 200
        echo ""
        echo "Message board log:"
        sudo -u sashimbxrpl bash -c  journalctl --user -u sashimono-mb-xrpl | tail -n 200
        echo ""
        echo "Auto updater service log:"
        journalctl -u evernode-auto-update | tail -n 200
    } > "$tempfile" 2>&1
    echo "Evernode log saved to $tempfile"
}

# Create a copy of this same script as a command.
function create_evernode_alias() {
    ! curl -fsSL $setup_script_url --output $evernode_alias >> $logfile 2>&1 && echo "Error in creating alias." && return 1
    ! chmod +x $evernode_alias >> $logfile 2>&1 && echo "Error in changing permission for the alias." && return 1
    return 0
}

function remove_evernode_alias() {
    rm $evernode_alias
}

function check_installer_pending_finish() {
    if [ -f /run/reboot-required.pkgs ] && [ -n "$(grep sashimono /run/reboot-required.pkgs)" ]; then
        echo "Your system needs to be rebooted in order to complete Sashimono installation."
        $interactive && confirm "Reboot now?" && reboot
        ! $interactive && echo "Rebooting..." && reboot
        return 0
    else
        # If reboot not required, check whether re-login is required in case the setup was run with sudo.
        # This is because the user account gets added to sashiadmin group and re-login is needed for group permission to apply.
        # without this, user cannot run "sashi" cli commands without sudo.
        if [ "$mode" == "install" ] && [ -n "$SUDO_USER" ] ; then
            echo "You need to logout and log back in, to complete Sashimono installation."
            return 0
        else
            return 1
        fi
    fi
}

function reg_info() {
    echo ""
    if MB_DATA_DIR=$MB_XRPL_DATA node $MB_XRPL_BIN reginfo ; then
        echo -e "\nYour account details are stored in $MB_XRPL_DATA/mb-xrpl.cfg and $MB_XRPL_DATA/secret.cfg."
    fi
}

function apply_ssl() {
    [ "$EUID" -ne 0 ] && echo "Please run with root privileges (sudo)." && exit 1
    
    local tls_key_file=$1
    local tls_cert_file=$2
    local tls_cabundle_file=$3

    ([ ! -f "$tls_key_file" ] || [ ! -f "$tls_cert_file" ] || \
        ([ "$tls_cabundle_file" != "" ] && [ ! -f "$tls_cabundle_file" ])) &&
            echo -e "One or more invalid files provided.\nusage: applyssl <private key file> <cert file> <ca bundle file (optional)>" && exit 1

    echo "Applying new SSL certificates for $evernode"
    echo "Key: $tls_key_file" && cp $tls_key_file $SASHIMONO_DATA/contract_template/cfg/tlskey.pem || exit 1
    echo "Cert: $tls_cert_file" && cp $tls_cert_file $SASHIMONO_DATA/contract_template/cfg/tlscert.pem || exit 1
    # ca bundle is optional.
    [ "$tls_cabundle_file" != "" ] && echo "CA bundle: $tls_cabundle_file" && (cat $tls_cabundle_file >> $SASHIMONO_DATA/contract_template/cfg/tlscert.pem || exit 1)

    sashi list | jq -rc '.[]' | while read -r inst; do \
        local instuser=$(echo $inst | jq -r '.user'); \
        local instname=$(echo $inst | jq -r '.name'); \
        echo -e "\nStopping contract instance $instname" && sashi stop -n $instname && \
            echo "Updating SSL certificates" && \
            cp $SASHIMONO_DATA/contract_template/cfg/tlskey.pem $SASHIMONO_DATA/contract_template/cfg/tlscert.pem /home/$instuser/$instname/cfg/ && \
            chmod 644 /home/$instuser/$instname/cfg/tlscert.pem && chmod 600 /home/$instuser/$instname/cfg/tlskey.pem && \
            chown -R $instuser:$instuser /home/$instuser/$instname/cfg/*.pem && \
            echo -e "Starting contract instance $instname" && sashi start -n $instname; \
    done

    echo "Done."
}

function reconfig_sashi() {
    echomult "Configuaring sashimono...\n"

    ! $SASHIMONO_BIN/sagent reconfig $SASHIMONO_DATA $alloc_instcount $alloc_cpu $alloc_ramKB $alloc_swapKB $alloc_diskKB &&
        echomult "There was an error in updating sashimono configuration." && return 1

    # Update cgroup allocations.
    ( [[ $alloc_ramKB -gt 0 ]] || [[ $alloc_swapKB -gt 0 ]] || [[ $alloc_instcount -gt 0 ]] ) &&
        echomult "Updating the cgroup configuration..." &&
        ! $SASHIMONO_BIN/user-cgcreate.sh $SASHIMONO_DATA && echomult "Error occured while upgrading cgroup allocations" && return 1

    # Update disk quotas.
    if ( [[ $alloc_diskKB -gt 0 ]] || [[ $alloc_instcount -gt 0 ]] ) ; then
        echomult "Updating the disk quotas..."

        users=$(cut -d: -f1 /etc/passwd | grep "^$SASHIUSER_PREFIX" | sort)
        readarray -t userarr <<<"$users"
        sashiusers=()
        for user in "${userarr[@]}"; do
            [ ${#user} -lt 24 ] || [ ${#user} -gt 32 ] || [[ ! "$user" =~ ^$SASHIUSER_PREFIX[0-9]+$ ]] && continue
            sashiusers+=("$user")
        done

        max_storage_kbytes=$(jq '.system.max_storage_kbytes' $saconfig)
        max_instance_count=$(jq '.system.max_instance_count' $saconfig)
        disk=$(expr $max_storage_kbytes / $max_instance_count)
        ucount=${#sashiusers[@]}
        if [ $ucount -gt 0 ]; then
            for user in "${sashiusers[@]}"; do
                setquota -g -F vfsv0 "$user" "$disk" "$disk" 0 0 /
            done
        fi
    fi

    return 0
}

function reconfig_mb() {
    echomult "Configuaring message board...\n"

    ! sudo -u $MB_XRPL_USER MB_DATA_DIR=$MB_XRPL_DATA node $MB_XRPL_BIN reconfig $lease_amount $alloc_instcount $rippled_server &&
        echo "There was an error in updating message board configuration." && return 1
    return 0
}

function config() {
    [ "$EUID" -ne 0 ] && echo "Please run with root privileges (sudo)." && exit 1

    alloc_instcount=0
    alloc_cpu=0
    alloc_ramKB=0
    alloc_swapKB=0
    alloc_diskKB=0
    lease_amount=0
    rippled_server=''

    local saconfig="$SASHIMONO_DATA/sa.cfg"
    local max_instance_count=$(jq '.system.max_instance_count' $saconfig)
    local max_mem_kbytes=$(jq '.system.max_mem_kbytes' $saconfig)
    local max_swap_kbytes=$(jq '.system.max_swap_kbytes' $saconfig)
    local max_storage_kbytes=$(jq '.system.max_storage_kbytes' $saconfig)

    local mbconfig="$MB_XRPL_DATA/mb-xrpl.cfg"
    local cfg_lease_amount=$(jq '.xrpl.leaseAmount' $mbconfig)
    local cfg_rippled_server=$(jq -r '.xrpl.rippledServer' $mbconfig)

    local update_sashi=0
    local update_mb=0

    local sub_mode=${1}
    if [ "$sub_mode" == "resources" ] ; then

        local ramMB=${2}       # memory to allocate for contract instances.
        local swapMB=${3}      # Swap to allocate for contract instances.
        local diskMB=${4}      # Disk space to allocate for contract instances.
        local instcount=${5}   # Total contract instance count.

        [ -z $ramMB ] && [ -z $swapMB ] && [ -z $diskMB ] && [ -z $instcount ] &&
            echomult "Your current resource allocation is:
            \n Memory: $(GB $max_mem_kbytes)
            \n Swap: $(GB $max_swap_kbytes)
            \n Disk space: $(GB $max_storage_kbytes)
            \n Instance count: $max_instance_count\n" && exit 0

        local help_text="Usage: evernode config resources | evernode config resources <memory MB> <swap MB> <disk MB> <max instance count>\n"
        [ ! -z $ramMB ] && [[ $ramMB != 0 ]] && ! validate_positive_decimal $ramMB &&
            echomult "Invalid memory size.\n   $help_text" && exit 1
        [ ! -z $swapMB ] && [[ $swapMB != 0 ]] && ! validate_positive_decimal $swapMB &&
            echomult "Invalid swap size.\n   $help_text" && exit 1
        [ ! -z $diskMB ] && [[ $diskMB != 0 ]] && ! validate_positive_decimal $diskMB &&
            echomult "Invalid disk size.\n   $help_text" && exit 1
        [ ! -z $instcount ] && [[ $instcount != 0 ]] && ! validate_positive_decimal $instcount &&
            echomult "Invalid instance count.\n   $help_text" && exit 1

        [ -z $instcount ] && instcount=0
        alloc_instcount=$instcount
        alloc_ramKB=$(( ramMB * 1000 ))
        alloc_swapKB=$(( swapMB * 1000 ))
        alloc_diskKB=$(( diskMB * 1000 ))

        ( ( [[ $alloc_instcount -eq 0 ]] || [[ $max_instance_count == $alloc_instcount ]] ) &&
            ( [[ $alloc_ramKB -eq 0 ]] || [[ $max_mem_kbytes == $alloc_ramKB ]] ) &&
            ( [[ $alloc_swapKB -eq 0 ]] || [[ $max_swap_kbytes == $alloc_swapKB ]] ) &&
            ( [[ $alloc_diskKB -eq 0 ]] || [[ $max_storage_kbytes == $alloc_diskKB ]] ) ) &&
            echomult "Resource configuration values are already configured!\n" && exit 0

        echomult "Using allocation"
        [[ $alloc_ramKB -gt 0 ]] && echomult "$(GB $alloc_ramKB) memory"
        [[ $alloc_swapKB -gt 0 ]] && echomult "$(GB $alloc_swapKB) Swap"
        [[ $alloc_diskKB -gt 0 ]] && echomult "$(GB $alloc_diskKB) disk space"
        [[ $alloc_instcount -gt 0 ]] && echomult "Distributed among $alloc_instcount contract instances"

        update_sashi=1
        [[ $alloc_instcount -gt 0 ]] && update_mb=1

    elif [ "$sub_mode" == "leaseamt" ] ; then

        local amount=${2}      # Contract instance lease amount in EVRs.
        [ -z $amount ] && echomult "Your current lease amount is: $cfg_lease_amount EVRs.\n" && exit 0
        
        ! validate_positive_decimal $amount &&
            echomult "Invalid lease amount.\n   Usage: evernode config leaseamt | evernode config leaseamt <lease amount>\n" &&
            exit 1
        lease_amount=$amount
        [[ $cfg_lease_amount == $lease_amount ]] && echomult "Lease amount is already configured!\n" && exit 0

        echomult "Using lease amount $lease_amount EVRs."

        update_mb=1

    elif [ "$sub_mode" == "rippled" ] ; then
    
        local server=${2}    # Rippled server URL
        [ -z $server ] && echomult "Your current rippled server is: $cfg_rippled_server\n" && exit 0

        ! validate_rippled_url $server &&
            echomult "\nUsage: evernode config rippled | evernode config rippled <rippled server>\n" &&
            exit 1
        rippled_server=$server
        [[ $cfg_rippled_server == $rippled_server ]] && echomult "Rippled server is already configured!\n" && exit 0

        echomult "Using the rippled address '$rippled_server'."

        update_mb=1

    else
        echomult "Invalid arguments.\n  Usage: evernode config [resources|leaseamt|rippled] [arguments]\n" && exit 1
    fi

    local mb_user_id=$(id -u "$MB_XRPL_USER")
    local mb_user_runtime_dir="/run/user/$mb_user_id"
    local has_error=0

    echomult "\nStaring the reconfiguration...\n"

    # Stop the message board service.
    echomult "Stopping the message board..."
    sudo -u "$MB_XRPL_USER" XDG_RUNTIME_DIR="$mb_user_runtime_dir" systemctl --user stop $MB_XRPL_SERVICE

    # Stop the sashimono service.
    if [ $update_sashi == 1 ] ; then
        echomult "Stopping the sashimono..."
        systemctl stop $SASHIMONO_SERVICE

        ! reconfig_sashi && has_error=1

        echomult "Starting the sashimono..."
        systemctl start $SASHIMONO_SERVICE
    fi

    if [ $has_error == 0 ] && [ $update_mb == 1 ] ; then
        ! reconfig_mb && has_error=1
    fi

    echomult "Starting the message board..."
    sudo -u "$MB_XRPL_USER" XDG_RUNTIME_DIR="$mb_user_runtime_dir" systemctl --user start $MB_XRPL_SERVICE

    [ $has_error == 1 ] && echomult "\nChanging the configuration exited with an error.\n"  && exit 1

    echomult "\nSuccessfully changed the configuration!\n"
}

function delete_instance()
{
    [ "$EUID" -ne 0 ] && echo "Please run with root privileges (sudo)." && exit 1

    instance_name=$1
    echo "Deleting instance $instance_name"
    ! sudo -u $MB_XRPL_USER MB_DATA_DIR=$MB_XRPL_DATA node $MB_XRPL_BIN delete $instance_name &&
        echo "There was an error in deleting the instance." && exit 1

    # Restart the message board to update the instance count
    local mb_user_id=$(id -u "$MB_XRPL_USER")
    local mb_user_runtime_dir="/run/user/$mb_user_id"

    sudo -u "$MB_XRPL_USER" XDG_RUNTIME_DIR="$mb_user_runtime_dir" systemctl --user restart $MB_XRPL_SERVICE

    echo "Instance deletion completed."
}

# Begin setup execution flow --------------------

echo "Thank you for trying out $evernode!"

if [ "$mode" == "install" ]; then

    if ! $interactive ; then
        inetaddr=${3}             # IP or DNS address.
        init_peer_port=${4}       # Starting peer port for instances.
        init_user_port=${5}       # Starting user port for instances.
        countrycode=${6}          # 2-letter country code.
        alloc_cpu=${7}            # CPU microsec to allocate for contract instances (max 1000000).
        alloc_ramKB=${8}          # Memory to allocate for contract instances.
        alloc_swapKB=${9}         # Swap to allocate for contract instances.
        alloc_diskKB=${10}        # Disk space to allocate for contract instances.
        alloc_instcount=${11}     # Total contract instance count.
        lease_amount=${12}        # Contract instance lease amount in EVRs.
        rippled_server=${13}      # Rippled server URL
        xrpl_account_address=${14} # XRPL account secret.
        xrpl_account_secret=${15} # XRPL account secret.
        email_address=${16}       # User email address
        tls_key_file=${17}        # File path to the tls private key.
        tls_cert_file=${18}       # File path to the tls certificate.
        tls_cabundle_file=${19}   # File path to the tls ca bundle.
    fi

    $interactive && ! confirm "This will install Sashimono, Evernode's contract instance management software,
            and register your system as an $evernode host.
            \nMake sure your system does not currently contain any other workloads important
            to you since we will be making modifications to your system configuration.
            \n\nContinue?" && exit 1

    check_sys_req
    check_prereq

    # Check bc command is installed.
    if ! command -v bc &>/dev/null; then
        echo "bc command not found. Installing.."
        apt-get -y install bc >/dev/null
    fi

    # Display licence file and ask for concent.
    printf "\n*****************************************************************************************************\n\n"
    curl --silent $licence_url | cat
    printf "\n\n*****************************************************************************************************\n"
    $interactive && ! confirm "\nDo you accept the terms of the licence agreement?" && exit 1

    if [ "$NO_MB" == "" ]; then
        init_setup_helpers
        set_rippled_server
        echo -e "Using Rippled server '$rippled_server'.\n"
        set_host_xrpl_account
        echo -e "Using xrpl account $xrpl_account_address with the specified secret.\n"
    fi

    set_email_address
    echo -e "Using the contact email address '$email_address'.\n"

    set_inet_addr
    echo -e "Using '$inetaddr' as host internet address.\n"

    set_country_code
    echo -e "Using '$countrycode' as country code.\n"

    set_cgrules_svc
    echo -e "Using '$cgrulesengd_service' as cgroups rules engine service.\n"

    set_instance_alloc
    echo -e "Using allocation $(GB $alloc_ramKB) memory, $(GB $alloc_swapKB) Swap, $(GB $alloc_diskKB) disk space, distributed among $alloc_instcount contract instances.\n"

    set_init_ports
    echo -e "Using peer port range $init_peer_port-$((init_peer_port + alloc_instcount)) and user port range $init_user_port-$((init_user_port + alloc_instcount))).\n"

    if [ "$NO_MB" == "" ]; then
        set_lease_amount
        echo -e "Lease amount set as $lease_amount EVRs per Moment.\n"
    fi

    $interactive && ! confirm "\n\nSetup will now begin the installation. Continue?" && exit 1

    echo "Starting installation..."
    install_evernode 0

    rm -r $setup_helper_dir >/dev/null 2>&1

    echomult "Installation successful! Installation log can be found at $logfile
            \n\nYour system is now registered on $evernode. You can check your system status with 'evernode status' command."

elif [ "$mode" == "uninstall" ]; then

    # echomult "\nWARNING! Uninstalling will deregister your host from $evernode and you will LOSE YOUR XRPL ACCOUNT credentials
    #         stored in '$MB_XRPL_DATA/mb-xrpl.cfg' and '$MB_XRPL_DATA/secret.cfg'. This is irreversible. Make sure you have your account address and
    #         secret elsewhere before proceeding.\n"

    # $interactive && ! confirm "\nHave you read above warning and backed up your account credentials?" && exit 1
    $interactive && ! confirm "\nAre you sure you want to uninstall $evernode?" && exit 1

    # Force uninstall on quiet mode.
    $interactive && uninstall_evernode 0 || uninstall_evernode 0 -f
    echo "Uninstallation complete!"

elif [ "$mode" == "transfer" ]; then
    $interactive && ! confirm "\nThis will uninstall and deregister this host from $evernode
        while allowing you to transfer the registration to a preferred transferee.
        \n\nAre you sure you want to transfer $evernode registration from this host?" && exit 1

    if ! $interactive ; then
        transferee_address=${3}           # Address of the transferee.
    fi

    set_transferee_address

    init_evernode_transfer

    uninstall_evernode 0

    echo "Transfer process was sucessfully initiated. You can now install and register $evernode using
        the account $transferee_address."

elif [ "$mode" == "status" ]; then
    reg_info

elif [ "$mode" == "list" ]; then
    sashi list

elif [ "$mode" == "update" ]; then
    update_evernode

elif [ "$mode" == "log" ]; then
    create_log

elif [ "$mode" == "applyssl" ]; then
    apply_ssl $2 $3 $4

elif [ "$mode" == "config" ]; then
    config $2 $3 $4 $5 $6

elif [ "$mode" == "delete" ]; then
    [ -z "$2" ] && echomult "A contract instance name must be specified (see 'evernode list').\n  Usage: evernode delete <instance name>" && exit 1

    delete_instance "$2"

fi

[ "$mode" != "uninstall" ] && check_installer_pending_finish

exit 0

# surrounding braces  are needed make the whole script to be buffered on client before execution.
}