sync.sh

sync.sh

#!/usr/bin/env bash
# Based on https://unix.stackexchange.com/a/693178

repr () {
    if [[ $# -gt 0 ]]; then
        local result="$(printf -- '%q ' "$@")"
        printf -- '%s' "${result::-1}"
    fi
    return $?
}

sync () {
    local args
    if [[ $- = *i* ]]; then
        args="$(repr "$@")"
        bash -sc "$(shopt -p); $(declare -f); ${FUNCNAME[0]} $args"
        return $?
    fi

    local initial_value current_value cleared backspace i percentage speed elapsed start_time eta
    start_time=$(date +%s)
    command sync "$@" &
    initial_value="$(grep -e 'Dirty:' /proc/meminfo | awk '{print $2}')"
    (( initial_value == 0 )) && initial_value=1
    sleep 0.1

    while ps -p $! > /dev/null; do
        current_value="$(grep -e 'Dirty:' /proc/meminfo | awk '{print $2}')"
        cleared=$(( initial_value - current_value ))
        percentage=$(( cleared * 100 / initial_value ))
        (( percentage < 0 )) && percentage=0

        elapsed=$(( $(date +%s) - start_time ))
        speed=$(( cleared / (elapsed + 1) ))  # kB/s
        eta=$(( (current_value) / (speed + 1) ))  # seconds

        printf -- '\r%3d%% | %d kB/s | ETA: %ds' "$percentage" "$speed" "$eta"
        sleep 1
    done

    printf -- '\r%3d%% | %d kB/s | ETA: 0s\n' 100 "$speed"
    wait $!
}

sync