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: $0 <command> <args>" 39 echo >&2 " record <list of object files or directories>" 40 echo >&2 " diff <commitA> <commitB>" 41 echo >&2 " clean all | <commit>" 42 exit 1 43} 44 45get_output_dir() { 46 dir=${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 57do_objdump() { 58 dir=$(get_output_dir $1) 59 base=${1##*/} 60 dis=$dir/${base%.o}.dis 61 62 [ ! -d "$dir" ] && mkdir -p $dir 63 64 # remove addresses for a cleaner diff 65 # http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and 66 $OBJDUMP -D $1 | sed "s/^[[:space:]]\+[0-9a-f]\+//" > $dis 67} 68 69dorecord() { 70 [ $# -eq 0 ] && usage 71 72 FILES="$*" 73 74 CMT="`git rev-parse --short HEAD`" 75 76 OBJDUMP="${CROSS_COMPILE}objdump" 77 78 for d in $FILES; do 79 if [ -d "$d" ]; then 80 for f in $(find $d -name '*.o') 81 do 82 do_objdump $f 83 done 84 else 85 do_objdump $d 86 fi 87 done 88} 89 90dodiff() { 91 [ $# -ne 2 ] && [ $# -ne 0 ] && usage 92 93 if [ $# -eq 0 ]; then 94 SRC="`git rev-parse --short HEAD^`" 95 DST="`git rev-parse --short HEAD`" 96 else 97 SRC="`git rev-parse --short $1`" 98 DST="`git rev-parse --short $2`" 99 fi 100 101 DIFF="`which colordiff`" 102 103 if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then 104 DIFF="`which diff`" 105 fi 106 107 SRCD="$TMPD/$SRC" 108 DSTD="$TMPD/$DST" 109 110 if [ ! -d "$SRCD" ]; then 111 echo >&2 "ERROR: $SRCD doesn't exist" 112 exit 1 113 fi 114 115 if [ ! -d "$DSTD" ]; then 116 echo >&2 "ERROR: $DSTD doesn't exist" 117 exit 1 118 fi 119 120 $DIFF -Nurd $SRCD $DSTD 121} 122 123doclean() { 124 [ $# -eq 0 ] && usage 125 [ $# -gt 1 ] && usage 126 127 if [ "x$1" = "xall" ]; then 128 rm -rf $TMPD/* 129 else 130 CMT="`git rev-parse --short $1`" 131 132 if [ -d "$TMPD/$CMT" ]; then 133 rm -rf $TMPD/$CMT 134 else 135 echo >&2 "$CMT not found" 136 fi 137 fi 138} 139 140[ $# -eq 0 ] && usage 141 142case "$1" in 143 record) 144 shift 145 dorecord $* 146 ;; 147 diff) 148 shift 149 dodiff $* 150 ;; 151 clean) 152 shift 153 doclean $* 154 ;; 155 *) 156 echo >&2 "Unrecognized command '$1'" 157 exit 1 158 ;; 159esac 160