1#!/bin/bash 2 3# objdiff - a small script for validating that a commit or series of commits 4# didn't change object code. 5# 6# Copyright 2014, Jason Cooper <jason@lakedaemon.net> 7# 8# Licensed under the terms of the GNU GPL version 2 9 10# usage example: 11# 12# $ git checkout COMMIT_A 13# $ <your fancy build command here> 14# $ ./scripts/objdiff record path/to/*.o 15# 16# $ git checkout COMMIT_B 17# $ <your fancy build command here> 18# $ ./scripts/objdiff record path/to/*.o 19# 20# $ ./scripts/objdiff diff COMMIT_A COMMIT_B 21# $ 22 23# And to clean up (everything is in .tmp_objdiff/*) 24# $ ./scripts/objdiff clean all 25# 26# Note: 'make mrproper' will also remove .tmp_objdiff 27 28SRCTREE=$(cd $(git rev-parse --show-toplevel 2>/dev/null); pwd) 29 30if [ -z "$SRCTREE" ]; then 31 echo >&2 "ERROR: Not a git repository." 32 exit 1 33fi 34 35TMPD=$SRCTREE/.tmp_objdiff 36 37usage() { 38 echo >&2 "Usage: $0 <command> <args>" 39 echo >&2 " record <list of object files>" 40 echo >&2 " diff <commitA> <commitB>" 41 echo >&2 " clean all | <commit>" 42 exit 1 43} 44 45get_output_dir() { 46 dir=${1%/*} 47 48 if [ "$dir" = "$1" ]; then 49 dir=. 50 fi 51 52 dir=$(cd $dir; pwd) 53 54 echo $TMPD/$CMT${dir#$SRCTREE} 55} 56 57dorecord() { 58 [ $# -eq 0 ] && usage 59 60 FILES="$*" 61 62 CMT="`git rev-parse --short HEAD`" 63 64 OBJDUMP="${CROSS_COMPILE}objdump" 65 66 for f in $FILES; do 67 dir=$(get_output_dir $f) 68 bn="${f##*/}" 69 70 [ ! -d "$dir" ] && mkdir -p $dir 71 72 # remove addresses for a more clear diff 73 # http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and 74 $OBJDUMP -D $f | sed "s/^[[:space:]]\+[0-9a-f]\+//" > $dir/$bn 75 done 76} 77 78dodiff() { 79 [ $# -ne 2 ] && [ $# -ne 0 ] && usage 80 81 if [ $# -eq 0 ]; then 82 SRC="`git rev-parse --short HEAD^`" 83 DST="`git rev-parse --short HEAD`" 84 else 85 SRC="`git rev-parse --short $1`" 86 DST="`git rev-parse --short $2`" 87 fi 88 89 DIFF="`which colordiff`" 90 91 if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then 92 DIFF="`which diff`" 93 fi 94 95 SRCD="$TMPD/$SRC" 96 DSTD="$TMPD/$DST" 97 98 if [ ! -d "$SRCD" ]; then 99 echo >&2 "ERROR: $SRCD doesn't exist" 100 exit 1 101 fi 102 103 if [ ! -d "$DSTD" ]; then 104 echo >&2 "ERROR: $DSTD doesn't exist" 105 exit 1 106 fi 107 108 $DIFF -Nurd $SRCD $DSTD 109} 110 111doclean() { 112 [ $# -eq 0 ] && usage 113 [ $# -gt 1 ] && usage 114 115 if [ "x$1" = "xall" ]; then 116 rm -rf $TMPD/* 117 else 118 CMT="`git rev-parse --short $1`" 119 120 if [ -d "$TMPD/$CMT" ]; then 121 rm -rf $TMPD/$CMT 122 else 123 echo >&2 "$CMT not found" 124 fi 125 fi 126} 127 128[ $# -eq 0 ] && usage 129 130case "$1" in 131 record) 132 shift 133 dorecord $* 134 ;; 135 diff) 136 shift 137 dodiff $* 138 ;; 139 clean) 140 shift 141 doclean $* 142 ;; 143 *) 144 echo >&2 "Unrecognized command '$1'" 145 exit 1 146 ;; 147esac 148