#!/usr/bin/sh

SRC_FILE_MB=$1

while true; do
    DD_PID=$(pidof dd)
    if [ -n "$DD_PID" ]; then
        break
    fi
done

while true; do
    sleep 5
    if [ ! -d /proc/"$DD_PID" ]; then
        break
    fi

    kill -s USR1 "$DD_PID"
    CURRENT_SIZE=$(tail -n 1 /tmp/dd_progress_file | sed "s/[^0-9].*//g")
    [ -n "$CURRENT_SIZE" ] && {
        CURRENT_MB=$((CURRENT_SIZE / 1048576))
        printf "Copied %s MB / %s MB\r" "$CURRENT_MB" "$SRC_FILE_MB"
    }
done

rm -f /tmp/dd_progress_file