Download and remove files from ftp using lftp and pget chunks to maximise transfers and download speed

download-from-seedbox.sh

#!/bin/bash

if [[ -z "$1" ]]; then
    echo "ERROR: no label provided (i.e. tv)"
    exit 1
fi

login=''
pass=''
host=''
port='21'
remote_dir="/files/_finished/$1/"
local_dir="/volume1/share/Video/Incoming/$1"

nfile='2'
nsegment='3'
minchunk='1'

base_name="$(basename "$0")"
lock_file="/tmp/${base_name}.lock"
echo "${0} Starting at $(date)"
trap "rm -f ${lock_file}" SIGINT SIGTERM
find /tmp -name "${base_name}.lock" -mmin +240 -delete > /dev/null
if [ -e "${lock_file}" ]
then
        echo "${base_name} is running already."
        exit
else
    touch "${lock_file}"
    lftp -p "${port}" -u "${login},${pass}" "${host}" << EOF
    set ssl:verify-certificate false
    set ftp:list-options -a
    set sftp:auto-confirm yes    
    set net:timeout 5
    set net:max-retries 2
    set net:reconnect-interval-base 5
    set ftp:ssl-force yes
    set ftp:ssl-protect-data
    #set pget:min-chunk-size ${minchunk}
    #set pget:default-n ${nsegment}
    set ftp:sync-mode no
    #set mirror:use-pget-n ${nsegment}
    set mirror:parallel-transfer-count ${nfile}
    set mirror:parallel-directories yes
    set xfer:use-temp-file yes
    set xfer:temp-file-name *.lftp
    mirror -c -v --loop --Remove-source-dirs "${remote_dir}" "${local_dir}"
    quit
EOF
	chmod 776 -R "${local_dir}"
        rm -f "${lock_file}"
        trap - SIGINT SIGTERM
        echo "${0} Finished at $(date)"
        exit
fi