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Linux/scripts/objdiff

  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 SRCTREE=$(cd $(git rev-parse --show-toplevel 2>/dev/null); pwd)
 29 
 30 if [ -z "$SRCTREE" ]; then
 31         echo >&2 "ERROR: Not a git repository."
 32         exit 1
 33 fi
 34 
 35 TMPD=$SRCTREE/.tmp_objdiff
 36 
 37 usage() {
 38         echo >&2 "Usage: $0 <command> <args>"
 39         echo >&2 "  record    <list of object files or directories>"
 40         echo >&2 "  diff      <commitA> <commitB>"
 41         echo >&2 "  clean     all | <commit>"
 42         exit 1
 43 }
 44 
 45 get_output_dir() {
 46         dir=${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 
 57 do_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 
 69 dorecord() {
 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 
 90 dodiff() {
 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 
123 doclean() {
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 
142 case "$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                 ;;
159 esac

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