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=$(git rev-parse --show-toplevel 2>/dev/null) 29 30if [ -z "$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 45dorecord() { 46 [ $# -eq 0 ] && usage 47 48 FILES="$*" 49 50 CMT="`git rev-parse --short HEAD`" 51 52 OBJDUMP="${CROSS_COMPILE}objdump" 53 OBJDIFFD="$TMPD/$CMT" 54 55 for f in $FILES; do 56 dn="${f%/*}" 57 bn="${f##*/}" 58 59 [ ! -d "$OBJDIFFD/$dn" ] && mkdir -p "$OBJDIFFD/$dn" 60 61 # remove addresses for a more clear diff 62 # http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and 63 $OBJDUMP -D "$f" | sed "s/^[[:space:]]\+[0-9a-f]\+//" \ 64 >"$OBJDIFFD/$dn/$bn" 65 done 66} 67 68dodiff() { 69 [ $# -ne 2 ] && [ $# -ne 0 ] && usage 70 71 if [ $# -eq 0 ]; then 72 SRC="`git rev-parse --short HEAD^`" 73 DST="`git rev-parse --short HEAD`" 74 else 75 SRC="`git rev-parse --short $1`" 76 DST="`git rev-parse --short $2`" 77 fi 78 79 DIFF="`which colordiff`" 80 81 if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then 82 DIFF="`which diff`" 83 fi 84 85 SRCD="$TMPD/$SRC" 86 DSTD="$TMPD/$DST" 87 88 if [ ! -d "$SRCD" ]; then 89 echo >&2 "ERROR: $SRCD doesn't exist" 90 exit 1 91 fi 92 93 if [ ! -d "$DSTD" ]; then 94 echo >&2 "ERROR: $DSTD doesn't exist" 95 exit 1 96 fi 97 98 $DIFF -Nurd $SRCD $DSTD 99} 100 101doclean() { 102 [ $# -eq 0 ] && usage 103 [ $# -gt 1 ] && usage 104 105 if [ "x$1" = "xall" ]; then 106 rm -rf $TMPD/* 107 else 108 CMT="`git rev-parse --short $1`" 109 110 if [ -d "$TMPD/$CMT" ]; then 111 rm -rf $TMPD/$CMT 112 else 113 echo >&2 "$CMT not found" 114 fi 115 fi 116} 117 118[ $# -eq 0 ] && usage 119 120case "$1" in 121 record) 122 shift 123 dorecord $* 124 ;; 125 diff) 126 shift 127 dodiff $* 128 ;; 129 clean) 130 shift 131 doclean $* 132 ;; 133 *) 134 echo >&2 "Unrecognized command '$1'" 135 exit 1 136 ;; 137esac 138