start-rsync-android

#!/usr/bin/env sh
# Copyright (C) 2020 reisub0 <reisub0@gmail.com>
#
# Distributed under terms of the MIT license.

FIRSTRUNFILE=/var/tmp/.rsync-for-android-first-run-complete

isFirstRun() {
    if [ ! -e "$FIRSTRUNFILE" ] || [ "$1" = 'init' ] ; then
        echo "FIRST RUN"
        return 0
    fi
    return 1
}

isDeviceConnected() {
    if [ "$(adb devices | wc -l)" -lt "3" ]; then
        false
    else
        true
    fi
}

textEscape() {
    # From https://gist.github.com/Pistos/0bf26f46c04bc43cc95c224d264e9f39
    text=$(printf '%s%%s' ${@})  # concatenate and replace spaces with %s
    text=${text%%%s}  # remove the trailing %s
    text=${text//\'/\\\'}  # escape single quotes
    text=${text//\"/\\\"}  # escape double quotes
    text=${text//\&/\\\&}  # escape ampersands
    text=${text//\;/\\\;}  # escape semicolons
    text=${text//\(/\\\(}  # escape opening parentheses
    text=${text//\)/\\\)}  # escape closing parentheses
    text=${text//\|/\\\|}  # escape pipes
    echo "$text"
}

# Wait
waitForCommand() {
    read -p "Press ENTER to continue once the command is done."
}

# Run the command through adb shell input
runCommandInTermux() {
    echo "Running command: $@"
    adb shell input text $(textEscape "$@") && adb shell input keyevent 66
}

set -e
if ! isDeviceConnected; then
    echo "There are no ADB devices connected. If that seems wrong, try 'adb kill-server'"
    exit 1
fi
# Launch Termux activity (If it fails, terminate script execution
adb shell <<EOF
if am start -n com.termux/com.termux.app.TermuxActivity 2>&1 | grep Error >/dev/null ; then
    echo "Termux doesn't seem to be installed. Please install it from the play store and initialise it."
    exit 1
fi
EOF

if isFirstRun "$@"; then
    runCommandInTermux 'termux-setup-storage'
    waitForCommand
    runCommandInTermux '(apt update) && (yes | apt upgrade) &&
                        (yes | apt install dropbear rsync)'
    waitForCommand
    runCommandInTermux 'curl https://gitlab.com/reisub0/rsync-for-android/raw/master/rsyncd.conf
    -o /data/data/com.termux/files/usr/etc/rsyncd.conf'
    waitForCommand
    touch "$FIRSTRUNFILE"
fi

runCommandInTermux 'rsync --daemon; exit'
echo "Forwarding port TCP:8873 to localhost:8873"
adb forward tcp:8873 tcp:8873
echo
echo "Successfully set up. You can now sync files using rsync://localhost:8873"