blob: 62e51dae2138db450555f3d15dbd14cc53c53652
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 |
160 |