#!/bin/bash
function upload_log ()
{
    file=$1
    path=$2
    old=/tmp/$( basename $file ).old
    new=/tmp/$( basename $file ).new
    log=/tmp/$( basename $file ).log
    if [ -f $new ] ; then
        cp $new $old
    else
        touch $old
    fi
    cp $file $new
    comm -1 -3 $old $new > $log
    if [ $( stat -c %s $log ) -ne 0 ] ; then
        curl --insecure https://monitor.planet-lab.org/monitor/uploadlogs --form "dir=$path" --form "log=@$log"
        if [ $? -ne 0 ] ; then
            # the upload has failed, so remove new file so no data is lost
            rm -f /tmp/$( basename $file ).new
        fi
    fi
}


upload_log ~/.bash_eternal_history hist
#upload_log /var/log/secure hist