android-sync.sh

#!/bin/sh

BASE="$( cd "$(dirname "$0")" ; pwd -P )"
LIB=${BASE}/lib
PATH=$PATH:${BASE}:${LIB}
export PATH

# Default iTunes library location
HOST_MUSIC_PATH="$HOME/Music/iTunes/iTunes Media/Music"

__TITLE__="Android Sync"
__DESCRIPTION__="iTunes music synchronisation utility for android devices"
__AUTHOR__="Angus Freudenberg, 2018"
__VERSION__="0.2.2-beta"
__LINE__="--------------------------------------------------------"

echo "$__TITLE__ - $__VERSION__\n$__DESCRIPTION__\n$__AUTHOR__\n$__LINE__"
echo

# FUNCTIONS

adb_check()
{
    # Try to launch adb to confirm it is present on the system

    cmd=$(adb help 2>&1) ||
        {
        echo >&2 "ERROR: adb not functional, make sure it is in your PATH:"
        echo $PATH
        exit 1
        }
}

check_device_connection()
{
    # Check if a device is connected via USB

    echo "Checking if your Android device is connected..."
    cmd=$(adb start-server 2>&1)
    device_state=$(adb get-state 2>&1)
        if [ "$device_state" != "device" ]
            then
            echo >&2 "ERROR: No device was detected."
            disconnect_device
        fi

    device=$(adb get-serialno)
    echo ${device} "is connected, finding external storage..."
}

disconnect_device()
{
    # Kill the adb service

    cmd=$(adb kill-server 2>&1)
    echo "It is now safe to unplug your device..."
    exit 1
}

get_storage_path()
{
    # Try to get the UUID of the sd_card mounted in /storage and create music and playlist folders if they don't exist
    # TODO Default to internal storage if an external storage device isn't present

      cmd=$(adb shell "cd storage/****-****/" 2>&1) || # Check if an sd card is present
    {
        echo 'ERROR: No external storage device could be found. Disengaging...'
        disconnect_device
    }
    sd_name=$(adb shell "cd storage/****-****/; pwd | sed 's#.*/##'") # Get the UUID of sd card for adb_sync
    echo 'Found external storage device:' ${sd_name}
    cmd=$(adb shell "cd storage/${sd_name}; mkdir -p Music; mkdir -p Playlists") ||
    {
        echo 'ERROR: There was a problem accessing the external storage device. Disengaging...'
        disconnect_device
    }
    echo

    # Defined path of the SD card's music and playlist folders
    device_music_path=/storage/${sd_name}/Music
    device_playlist_path=/storage/${sd_name}/Playlists
}

synchronise_music()
{
    # Synchronise music from iTunes library to device sd card
    #TODO - Determine how to sync music files that have added/updated lyrics ?md5 checksum

    echo "Synchronising music....\nDo not unplug your device!"
    ${LIB}/adb-sync -f -d "${HOST_MUSIC_PATH}/" "${device_music_path}" ||
    {
        echo "ERROR: A problem occurred while transferring your music. Disengaging..."
        disconnect_device
    }
    echo
}

synchronise_playlists()
{
    # Synchronise playlists from iTunes library to device sd card
    #TODO - Dynamic switching between internal and external storage for better compatibility with music players

    echo "Generating temporary directory..."
    playlist=$(mktemp -d) # Temporary folder
    echo "Extracting playlists to temporary directory..."
    java -jar ${LIB}/itunesexport.jar "${HOST_MUSIC_PATH}" -outputDir="${playlist}/" -fileTypes=ALL ||
    {
        echo "ERROR: A problem occurred while exporting your playlists. Disengaging..."
        rm -rf ${playlist} # Delete temporary folder
        disconnect_device
    }
    echo
    echo "Synchronising playlists...\nDo not unplug your device!"
    ${LIB}/adb-sync -f -d "${playlist}/" "${device_playlist_path}" ||
    {
        echo "A problem occurred while transferring your playlists. Disengaging..."
        disconnect_device
    }
    echo
}

clean_up_files()
{
    # Remove temporary files and redundant .DS_Store files from music folder

    echo "Cleaning up..."
    rm -rf ${playlist}
    cmd=$(adb shell "cd storage/${sd_name}/Music/; find . -name '.DS_Store' -delete") # Delete .DS_Store files
    echo "iTunes synchronisation complete!"
    echo
}

# MAIN

adb_check
check_device_connection
get_storage_path
synchronise_music
synchronise_playlists
clean_up_files
disconnect_device