Masahiro Yamada | 598e2d3 | 2014-04-15 13:29:00 +0900 | [diff] [blame^] | 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 | |
| 28 | GIT_DIR="`git rev-parse --git-dir`" |
| 29 | |
| 30 | if [ -d "$GIT_DIR" ]; then |
| 31 | TMPD="${GIT_DIR%git}tmp_objdiff" |
| 32 | |
| 33 | [ -d "$TMPD" ] || mkdir "$TMPD" |
| 34 | else |
| 35 | echo "ERROR: git directory not found." |
| 36 | exit 1 |
| 37 | fi |
| 38 | |
| 39 | usage() { |
| 40 | echo "Usage: $0 <command> <args>" |
| 41 | echo " record <list of object files>" |
| 42 | echo " diff <commitA> <commitB>" |
| 43 | echo " clean all | <commit>" |
| 44 | exit 1 |
| 45 | } |
| 46 | |
| 47 | dorecord() { |
| 48 | [ $# -eq 0 ] && usage |
| 49 | |
| 50 | FILES="$*" |
| 51 | |
| 52 | CMT="`git rev-parse --short HEAD`" |
| 53 | |
| 54 | OBJDUMP="${CROSS_COMPILE}objdump" |
| 55 | OBJDIFFD="$TMPD/$CMT" |
| 56 | |
| 57 | [ ! -d "$OBJDIFFD" ] && mkdir -p "$OBJDIFFD" |
| 58 | |
| 59 | for f in $FILES; do |
| 60 | dn="${f%/*}" |
| 61 | bn="${f##*/}" |
| 62 | |
| 63 | [ ! -d "$OBJDIFFD/$dn" ] && mkdir -p "$OBJDIFFD/$dn" |
| 64 | |
| 65 | # remove addresses for a more clear diff |
| 66 | # http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and |
| 67 | $OBJDUMP -D "$f" | sed "s/^[[:space:]]\+[0-9a-f]\+//" \ |
| 68 | >"$OBJDIFFD/$dn/$bn" |
| 69 | done |
| 70 | } |
| 71 | |
| 72 | dodiff() { |
| 73 | [ $# -ne 2 ] && [ $# -ne 0 ] && usage |
| 74 | |
| 75 | if [ $# -eq 0 ]; then |
| 76 | SRC="`git rev-parse --short HEAD^`" |
| 77 | DST="`git rev-parse --short HEAD`" |
| 78 | else |
| 79 | SRC="`git rev-parse --short $1`" |
| 80 | DST="`git rev-parse --short $2`" |
| 81 | fi |
| 82 | |
| 83 | DIFF="`which colordiff`" |
| 84 | |
| 85 | if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then |
| 86 | DIFF="`which diff`" |
| 87 | fi |
| 88 | |
| 89 | SRCD="$TMPD/$SRC" |
| 90 | DSTD="$TMPD/$DST" |
| 91 | |
| 92 | if [ ! -d "$SRCD" ]; then |
| 93 | echo "ERROR: $SRCD doesn't exist" |
| 94 | exit 1 |
| 95 | fi |
| 96 | |
| 97 | if [ ! -d "$DSTD" ]; then |
| 98 | echo "ERROR: $DSTD doesn't exist" |
| 99 | exit 1 |
| 100 | fi |
| 101 | |
| 102 | $DIFF -Nurd $SRCD $DSTD |
| 103 | } |
| 104 | |
| 105 | doclean() { |
| 106 | [ $# -eq 0 ] && usage |
| 107 | [ $# -gt 1 ] && usage |
| 108 | |
| 109 | if [ "x$1" = "xall" ]; then |
| 110 | rm -rf $TMPD/* |
| 111 | else |
| 112 | CMT="`git rev-parse --short $1`" |
| 113 | |
| 114 | if [ -d "$TMPD/$CMT" ]; then |
| 115 | rm -rf $TMPD/$CMT |
| 116 | else |
| 117 | echo "$CMT not found" |
| 118 | fi |
| 119 | fi |
| 120 | } |
| 121 | |
| 122 | [ $# -eq 0 ] && usage |
| 123 | |
| 124 | case "$1" in |
| 125 | record) |
| 126 | shift |
| 127 | dorecord $* |
| 128 | ;; |
| 129 | diff) |
| 130 | shift |
| 131 | dodiff $* |
| 132 | ;; |
| 133 | clean) |
| 134 | shift |
| 135 | doclean $* |
| 136 | ;; |
| 137 | *) |
| 138 | echo "Unrecognized command '$1'" |
| 139 | exit 1 |
| 140 | ;; |
| 141 | esac |