Generate diff to evaluate wire compatibility between Hadoop versions

protodiff.sh

#!/usr/bin/env bash

cd /tmp

OLD=branch-2.7
NEW=trunk

mkdir new
mkdir old
git clone git://git.apache.org/hadoop.git

function gather_protos() {
  SOURCE=${1}
  TARGET=${2}
  for proto in $(cd ${SOURCE} && find . -name \*.proto | sed -e 's|^\./||'); do
    #flattened=${proto//\//_} # Trips up on files that moved
    flattened=$(basename ${proto})
    cp ${SOURCE}/${proto} ${TARGET}/${flattened}
  done
}

(cd hadoop; git checkout ${OLD})
gather_protos hadoop old

(cd hadoop; git checkout ${NEW})
gather_protos hadoop new

meld old new