#!/bin/bash

DIFFTOOL="meld";

if [ "$(which ${DIFFTOOL})" == "" ]; then

DIFFTOOL="vimdiff";

fi

function Usage {

scriptname=$(basename "$0");

echo "${scriptname}: USAGE:";

echo "${scriptname} SSHORIGIN SSHDEST FILEPATH";

}

if [ "$3" == "" ]; then

Usage;

else

srcHost="$1";

dstHost="$2";

filePath="$3";

fileName="$(basename "${filePath}")";

scp ${srcHost}:${filePath} /tmp/${srcHost}.${fileName};

scp ${dstHost}:${filePath} /tmp/${dstHost}.${fileName};

cp /tmp/${srcHost}.${fileName} /tmp/orig.${srcHost}.${fileName};

cp /tmp/${dstHost}.${fileName} /tmp/orig.${dstHost}.${fileName};

${DIFFTOOL} /tmp/${srcHost}.${fileName} /tmp/${dstHost}.${fileName};

if [ "$(diff /tmp/orig.${srcHost}.${fileName} /tmp/${srcHost}.${fileName})" != "" ]; then

while true; do

read -p "Source file has been modified: reupload in ${srcHost}:${filePath} (y/n)? " yn

case $yn in

[Yy]* ) scp /tmp/${srcHost}.${fileName} ${srcHost}:${filePath}; break;;

[Nn]* ) break;;

esac

done

fi

if [ "$(diff /tmp/orig.${dstHost}.${fileName} /tmp/${dstHost}.${fileName})" != "" ]; then

while true; do

read -p "Destination file has been modified: reupload in ${dstHost}:${filePath} (y/n)? " yn

case $yn in

[Yy]* ) scp /tmp/${dstHost}.${fileName} ${dstHost}:${filePath}; break;;

[Nn]* ) break;;

esac

done

fi

rm -f /tmp/${srcHost}.${fileName};

rm -f /tmp/orig.${srcHost}.${fileName};

rm -f /tmp/${dstHost}.${fileName};

rm -f /tmp/orig.${dstHost}.${fileName};

fi