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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