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#!/bin/bash

# objdiff - a small script for validating that a commit or series of commits

# didn't change object code.

#

# Copyright 2014, Jason Cooper <jason@lakedaemon.net>

#

# Licensed under the terms of the GNU GPL version 2

# usage example:

#

# $ git checkout COMMIT_A

# $ <your fancy build command here>

# $ ./scripts/objdiff record path/to/*.o

#

# $ git checkout COMMIT_B

# $ <your fancy build command here>

# $ ./scripts/objdiff record path/to/*.o

#

# $ ./scripts/objdiff diff COMMIT_A COMMIT_B

# $

# And to clean up (everything is in .tmp_objdiff/*)

# $ ./scripts/objdiff clean all

#

# Note: 'make mrproper' will also remove .tmp_objdiff

SRCTREE=$(cd $(git rev-parse --show-toplevel 2>/dev/null); pwd)

if [ -z "$SRCTREE" ]; then

echo >&2 "ERROR: Not a git repository."

exit 1

fi

TMPD=$SRCTREE/.tmp_objdiff

usage() {

echo >&2 "Usage: $0 <command> <args>"

echo >&2 " record <list of object files or directories>"

echo >&2 " diff <commitA> <commitB>"

echo >&2 " clean all | <commit>"

exit 1

}

get_output_dir() {

dir=${1%/*}

if [ "$dir" = "$1" ]; then

dir=.

fi

dir=$(cd $dir; pwd)

echo $TMPD/$CMT${dir#$SRCTREE}

}

do_objdump() {

dir=$(get_output_dir $1)

base=${1##*/}

dis=$dir/${base%.o}.dis

[ ! -d "$dir" ] && mkdir -p $dir

# remove addresses for a cleaner diff

# http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and

$OBJDUMP -D $1 | sed "s/^[[:space:]]\+[0-9a-f]\+//" > $dis

}

dorecord() {

[ $# -eq 0 ] && usage

FILES="$*"

CMT="`git rev-parse --short HEAD`"

OBJDUMP="${CROSS_COMPILE}objdump"

for d in $FILES; do

if [ -d "$d" ]; then

for f in $(find $d -name '*.o')

do

do_objdump $f

done

else

do_objdump $d

fi

done

}

dodiff() {

[ $# -ne 2 ] && [ $# -ne 0 ] && usage

if [ $# -eq 0 ]; then

SRC="`git rev-parse --short HEAD^`"

DST="`git rev-parse --short HEAD`"

else

SRC="`git rev-parse --short $1`"

DST="`git rev-parse --short $2`"

fi

DIFF="`which colordiff`"

if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then

DIFF="`which diff`"

fi

SRCD="$TMPD/$SRC"

DSTD="$TMPD/$DST"

if [ ! -d "$SRCD" ]; then

echo >&2 "ERROR: $SRCD doesn't exist"

exit 1

fi

if [ ! -d "$DSTD" ]; then

echo >&2 "ERROR: $DSTD doesn't exist"

exit 1

fi

$DIFF -Nurd $SRCD $DSTD

}

doclean() {

[ $# -eq 0 ] && usage

[ $# -gt 1 ] && usage

if [ "x$1" = "xall" ]; then

rm -rf $TMPD/*

else

CMT="`git rev-parse --short $1`"

if [ -d "$TMPD/$CMT" ]; then

rm -rf $TMPD/$CMT

else

echo >&2 "$CMT not found"

fi

fi

}

[ $# -eq 0 ] && usage

case "$1" in

record)

shift

dorecord $*

;;

diff)

shift

dodiff $*

;;

clean)

shift

doclean $*

;;

*)

echo >&2 "Unrecognized command '$1'"

exit 1

;;

esac