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 stripped=$dir/${base%.o}.stripped 61 dis=$dir/${base%.o}.dis 62 63 [ ! -d "$dir" ] && mkdir -p $dir 64 65 # remove addresses for a cleaner diff 66 # http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and 67 $STRIP -g $1 -R __bug_table -R .note -R .comment -o $stripped 68 $OBJDUMP -D $stripped | sed -e "s/^[[:space:]]\+[0-9a-f]\+//" -e "s:^$stripped:$1:" > $dis 69} 70 71dorecord() { 72 [ $# -eq 0 ] && usage 73 74 FILES="$*" 75 76 CMT="`git rev-parse --short HEAD`" 77 78 STRIP="${CROSS_COMPILE}strip" 79 OBJDUMP="${CROSS_COMPILE}objdump" 80 81 for d in $FILES; do 82 if [ -d "$d" ]; then 83 for f in $(find $d -name '*.o') 84 do 85 do_objdump $f 86 done 87 else 88 do_objdump $d 89 fi 90 done 91} 92 93dodiff() { 94 [ $# -ne 2 ] && [ $# -ne 0 ] && usage 95 96 if [ $# -eq 0 ]; then 97 SRC="`git rev-parse --short HEAD^`" 98 DST="`git rev-parse --short HEAD`" 99 else 100 SRC="`git rev-parse --short $1`" 101 DST="`git rev-parse --short $2`" 102 fi 103 104 DIFF="`which colordiff`" 105 106 if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then 107 DIFF="`which diff`" 108 fi 109 110 SRCD="$TMPD/$SRC" 111 DSTD="$TMPD/$DST" 112 113 if [ ! -d "$SRCD" ]; then 114 echo >&2 "ERROR: $SRCD doesn't exist" 115 exit 1 116 fi 117 118 if [ ! -d "$DSTD" ]; then 119 echo >&2 "ERROR: $DSTD doesn't exist" 120 exit 1 121 fi 122 123 $DIFF -Nurd $SRCD $DSTD 124} 125 126doclean() { 127 [ $# -eq 0 ] && usage 128 [ $# -gt 1 ] && usage 129 130 if [ "x$1" = "xall" ]; then 131 rm -rf $TMPD/* 132 else 133 CMT="`git rev-parse --short $1`" 134 135 if [ -d "$TMPD/$CMT" ]; then 136 rm -rf $TMPD/$CMT 137 else 138 echo >&2 "$CMT not found" 139 fi 140 fi 141} 142 143[ $# -eq 0 ] && usage 144 145case "$1" in 146 record) 147 shift 148 dorecord $* 149 ;; 150 diff) 151 shift 152 dodiff $* 153 ;; 154 clean) 155 shift 156 doclean $* 157 ;; 158 *) 159 echo >&2 "Unrecognized command '$1'" 160 exit 1 161 ;; 162esac 163