File to help rsync over ngrok.

rsync_ngrok.sh

#!/bin/bash

# Make sure to use this on the server side: `ngrok tcp 22`
# Usage:
#   rsync_ngrok USERNAME REMOTEDIRPATH PORTNUMBER LOCALDIRPATH

# if no arguments are given to the script.
if [[ $# -eq 0 ]] ; then
    echo 'rsync_ngrok Script used to download files or folders from remote host offering usage via ngrok.'
    echo 'Usage:   rsync_ngrok USERNAME REMOTEDIRPATH PORTNUMBER LOCALDIRPATH'
    echo ""
    exit 0
fi

# Capture the arguments
USERNAME=$1
REMOTEDIRPATH=$2
PORTNUMBER=${3:-22} # default port 22. It's highly unlikely ngrok will ever give us that port though.
LOCALDIRPATH=${4:-.} # Default directory is the current directory. Files will be copied here.

download() {
  # Function to attempt download.
  echo 'Attemping download!'
  rsync -avzP -e "ssh -p $PORTNUMBER" [email protected]:$REMOTEDIRPATH $LOCALDIRPATH
}

echo "Beginning download of $REMOTEDIRPATH from [email protected]:$PORTNUMBER to $LOCALDIRPATH"
download
while [ $? -ne 0 ]; do # Keep repeating for as long as the exit code for the previously executed line is not 0.
  echo 'Retrying....'
  sleep 5
  download
done

echo 'Done!'