Sync a local music library to an Android device through SSH using RSYNC

sync-music-library-to-android.bash

#!/usr/bin/env bash

  : ' Script to sync a music library from local machine to an Android device
      through a SSH connection using rsync and checking files using size only
      method.
      
      I do recommend SSHelper as a SSH server for Android devices, you can
      download and install it from here:
      https://play.google.com/store/apps/details?id=com.arachnoid.sshelper
      
      Install it and start the SSH server before running this script.

      '

# bash default parameters
set -o errexit  # make your script exit when a command fails
set -o pipefail # exit status of the last command that threw a non-zero exit code is returned
set -o nounset  # exit when your script tries to use undeclared variables

# default values
DEFAULT_ANDROID_IP_ADDRESS="192.168.1.10"
DEFAULT_ANDROID_SSH_PORT="2222"
DEFAULT_LOCAL_MACHINE_SOURCE_FOLDER="/home/"${USER}"/Music"
DEFAULT_ANDROID_DESTINATION_FOLDER="/sdcard/Music"

# binaries
RSYNC=$(which rsync)

# variables
ANDROID_IP_ADDRESS="${1:-"${DEFAULT_ANDROID_IP_ADDRESS}"}"
ANDROID_SSH_PORT="${2:-"${DEFAULT_ANDROID_SSH_PORT}"}"
SOURCE_FOLDER="${3:-"${DEFAULT_LOCAL_MACHINE_SOURCE_FOLDER}"}"
ANDROID_DESTINATION_FOLDER="${4:-"${DEFAULT_ANDROID_DESTINATION_FOLDER}"}"

# flow
echo "Start syncing songs from "${SOURCE_FOLDER}" to "${ANDROID_DESTINATION_FOLDER}" in device "${ANDROID_IP_ADDRESS}""
"${RSYNC}" --recursive \
            --verbose \
            --size-only \
            --inplace \
            --no-whole-file \
            --delete-excluded \
            --human-readable \
            --info=progress2 \
	    --rsh="ssh -p "${ANDROID_SSH_PORT}"" \
            ""${SOURCE_FOLDER}"/" \
            ""${ANDROID_IP_ADDRESS}":"${ANDROID_DESTINATION_FOLDER}""