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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."
TMPD=$SRCTREE/.tmp_objdiff
	echo >&2 "Usage: $0 <command> <args>"
	echo >&2 "  record    <list of object files or directories>"
	echo >&2 "  diff      <commitA> <commitB>"
	echo >&2 "  clean     all | <commit>"
get_output_dir() {
	dir=${1%/*}
	if [ "$dir" = "$1" ]; then
	dir=$(cd $dir; pwd)
	echo $TMPD/$CMT${dir#$SRCTREE}
do_objdump() {
	dir=$(get_output_dir $1)
	base=${1##*/}
	stripped=$dir/${base%.o}.stripped
	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
	$STRIP -g $1 -R __bug_table -R .note -R .comment -o $stripped
	$OBJDUMP -D $stripped | sed -e "s/^[[:space:]]\+[0-9a-f]\+//" -e "s:^$stripped:$1:" > $dis
dorecord() {
	[ $# -eq 0 ] && usage
	FILES="$*"
	CMT="`git rev-parse --short HEAD`"
	STRIP="${CROSS_COMPILE}strip"
	OBJDUMP="${CROSS_COMPILE}objdump"
	for d in $FILES; do
		if [ -d "$d" ]; then
			for f in $(find $d -name '*.o')
				do_objdump $f
			do_objdump $d
	[ $# -ne 2 ] && [ $# -ne 0 ] && usage
	if [ $# -eq 0 ]; then
		SRC="`git rev-parse --short HEAD^`"
		DST="`git rev-parse --short HEAD`"
		SRC="`git rev-parse --short $1`"
		DST="`git rev-parse --short $2`"
	DIFF="`which colordiff`"
	if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then
		DIFF="`which diff`"
	SRCD="$TMPD/$SRC"
	DSTD="$TMPD/$DST"
	if [ ! -d "$SRCD" ]; then
		echo >&2 "ERROR: $SRCD doesn't exist"
	if [ ! -d "$DSTD" ]; then
		echo >&2 "ERROR: $DSTD doesn't exist"
	$DIFF -Nurd $SRCD $DSTD
doclean() {
	[ $# -eq 0 ] && usage
	[ $# -gt 1 ] && usage
	if [ "x$1" = "xall" ]; then
		rm -rf $TMPD/*
		CMT="`git rev-parse --short $1`"
		if [ -d "$TMPD/$CMT" ]; then
			rm -rf $TMPD/$CMT
			echo >&2 "$CMT not found"
[ $# -eq 0 ] &&	usage
case "$1" in
		dorecord $*
		dodiff $*
		doclean $*
		echo >&2 "Unrecognized command '$1'"

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