summaryrefslogtreecommitdiff
path: root/git-bisect.sh
blob: fda1712a085fa9271ea1a8e0e581c5d4c6801969 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
#!/bin/sh
 
USAGE='[start|bad|good|next|reset|visualize|replay|log|run]'
LONG_USAGE='git bisect start [<pathspec>]	reset bisect state and start bisection.
git bisect bad [<rev>]		mark <rev> a known-bad revision.
git bisect good [<rev>...]	mark <rev>... known-good revisions.
git bisect next			find next bisection to test and check it out.
git bisect reset [<branch>]	finish bisection search and go back to branch.
git bisect visualize            show bisect status in gitk.
git bisect replay <logfile>	replay bisection log.
git bisect log			show bisect log.
git bisect run <cmd>... 	use <cmd>... to automatically bisect.'
 
. git-sh-setup
require_work_tree
 
sq() {
	@@PERL@@ -e '
		for (@ARGV) {
			s/'\''/'\'\\\\\'\''/g;
			print " '\''$_'\''";
		}
		print "\n";
	' "$@"
}
 
bisect_autostart() {
	test -d "$GIT_DIR/refs/bisect" || {
		echo >&2 'You need to start by "git bisect start"'
		if test -t 0
		then
			echo >&2 -n 'Do you want me to do it for you [Y/n]? '
			read yesno
			case "$yesno" in
			[Nn]*)
				exit ;;
			esac
			bisect_start
		else
			exit 1
		fi
	}
}
 
bisect_start() {
	#
	# Verify HEAD. If we were bisecting before this, reset to the
	# top-of-line master first!
	#
	head=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD) ||
	die "Bad HEAD - I need a symbolic ref"
	case "$head" in
	refs/heads/bisect)
		if [ -s "$GIT_DIR/head-name" ]; then
		    branch=`cat "$GIT_DIR/head-name"`
		else
		    branch=master
	        fi
		git checkout $branch || exit
		;;
	refs/heads/*)
		[ -s "$GIT_DIR/head-name" ] && die "won't bisect on seeked tree"
		echo "$head" | sed 's#^refs/heads/##' >"$GIT_DIR/head-name"
		;;
	*)
		die "Bad HEAD - strange symbolic ref"
		;;
	esac
 
	#
	# Get rid of any old bisect state
	#
	rm -f "$GIT_DIR/refs/heads/bisect"
	rm -rf "$GIT_DIR/refs/bisect/"
	mkdir "$GIT_DIR/refs/bisect"
	{
	    printf "git-bisect start"
	    sq "$@"
	} >"$GIT_DIR/BISECT_LOG"
	sq "$@" >"$GIT_DIR/BISECT_NAMES"
}
 
bisect_bad() {
	bisect_autostart
	case "$#" in
	0)
		rev=$(git-rev-parse --verify HEAD) ;;
	1)
		rev=$(git-rev-parse --verify "$1^{commit}") ;;
	*)
		usage ;;
	esac || exit
	echo "$rev" >"$GIT_DIR/refs/bisect/bad"
	echo "# bad: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
	echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
	bisect_auto_next
}
 
bisect_good() {
	bisect_autostart
        case "$#" in
	0)    revs=$(git-rev-parse --verify HEAD) || exit ;;
	*)    revs=$(git-rev-parse --revs-only --no-flags "$@") &&
		test '' != "$revs" || die "Bad rev input: $@" ;;
	esac
	for rev in $revs
	do
		rev=$(git-rev-parse --verify "$rev^{commit}") || exit
		echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
		echo "# good: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
		echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
	done
	bisect_auto_next
}
 
bisect_next_check() {
	next_ok=no
        test -f "$GIT_DIR/refs/bisect/bad" &&
	case "$(cd "$GIT_DIR" && echo refs/bisect/good-*)" in
	refs/bisect/good-\*) ;;
	*) next_ok=yes ;;
	esac
	case "$next_ok,$1" in
	no,) false ;;
	no,fail)
	    echo >&2 'You need to give me at least one good and one bad revisions.'
	    exit 1 ;;
	*)
	    true ;;
	esac
}
 
bisect_auto_next() {
	bisect_next_check && bisect_next || :
}
 
bisect_next() {
        case "$#" in 0) ;; *) usage ;; esac
	bisect_autostart
	bisect_next_check fail
	bad=$(git-rev-parse --verify refs/bisect/bad) &&
	good=$(git-rev-parse --sq --revs-only --not \
		$(cd "$GIT_DIR" && ls refs/bisect/good-*)) &&
	rev=$(eval "git-rev-list --bisect $good $bad -- $(cat "$GIT_DIR/BISECT_NAMES")") || exit
	if [ -z "$rev" ]; then
	    echo "$bad was both good and bad"
	    exit 1
	fi
	if [ "$rev" = "$bad" ]; then
	    echo "$rev is first bad commit"
	    git-diff-tree --pretty $rev
	    exit 0
	fi
	nr=$(eval "git-rev-list $rev $good -- $(cat $GIT_DIR/BISECT_NAMES)" | wc -l) || exit
	echo "Bisecting: $nr revisions left to test after this"
	echo "$rev" > "$GIT_DIR/refs/heads/new-bisect"
	git checkout -q new-bisect || exit
	mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
	GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD refs/heads/bisect
	git-show-branch "$rev"
}
 
bisect_visualize() {
	bisect_next_check fail
	not=`cd "$GIT_DIR/refs" && echo bisect/good-*`
	eval gitk bisect/bad --not $not -- $(cat "$GIT_DIR/BISECT_NAMES")
}
 
bisect_reset() {
	case "$#" in
	0) if [ -s "$GIT_DIR/head-name" ]; then
	       branch=`cat "$GIT_DIR/head-name"`
	   else
	       branch=master
	   fi ;;
	1) git-show-ref --verify --quiet -- "refs/heads/$1" || {
	       echo >&2 "$1 does not seem to be a valid branch"
	       exit 1
	   }
	   branch="$1" ;;
        *)
	    usage ;;
	esac
	if git checkout "$branch"; then
		rm -fr "$GIT_DIR/refs/bisect"
		rm -f "$GIT_DIR/refs/heads/bisect" "$GIT_DIR/head-name"
		rm -f "$GIT_DIR/BISECT_LOG"
		rm -f "$GIT_DIR/BISECT_NAMES"
		rm -f "$GIT_DIR/BISECT_RUN"
	fi
}
 
bisect_replay () {
	test -r "$1" || {
		echo >&2 "cannot read $1 for replaying"
		exit 1
	}
	bisect_reset
	while read bisect command rev
	do
		test "$bisect" = "git-bisect" || continue
		case "$command" in
		start)
			cmd="bisect_start $rev"
			eval "$cmd"
			;;
		good)
			echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
			echo "# good: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
			echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
			;;
		bad)
			echo "$rev" >"$GIT_DIR/refs/bisect/bad"
			echo "# bad: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
			echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
			;;
		*)
			echo >&2 "?? what are you talking about?"
			exit 1 ;;
		esac
	done <"$1"
	bisect_auto_next
}
 
bisect_run () {
    while true
    do
      echo "running $@"
      "$@"
      res=$?
 
      # Check for really bad run error.
      if [ $res -lt 0 -o $res -ge 128 ]; then
	  echo >&2 "bisect run failed:"
	  echo >&2 "exit code $res from '$@' is < 0 or >= 128"
	  exit $res
      fi
 
      # Use "bisect_good" or "bisect_bad"
      # depending on run success or failure.
      if [ $res -gt 0 ]; then
	  next_bisect='bisect_bad'
      else
	  next_bisect='bisect_good'
      fi
 
      # We have to use a subshell because bisect_good or
      # bisect_bad functions can exit.
      ( $next_bisect > "$GIT_DIR/BISECT_RUN" )
      res=$?
 
      cat "$GIT_DIR/BISECT_RUN"
 
      if [ $res -ne 0 ]; then
	  echo >&2 "bisect run failed:"
	  echo >&2 "$next_bisect exited with error code $res"
	  exit $res
      fi
 
      if grep "is first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
	  echo "bisect run success"
	  exit 0;
      fi
 
    done
}
 
 
case "$#" in
0)
    usage ;;
*)
    cmd="$1"
    shift
    case "$cmd" in
    start)
        bisect_start "$@" ;;
    bad)
        bisect_bad "$@" ;;
    good)
        bisect_good "$@" ;;
    next)
        # Not sure we want "next" at the UI level anymore.
        bisect_next "$@" ;;
    visualize)
	bisect_visualize "$@" ;;
    reset)
        bisect_reset "$@" ;;
    replay)
	bisect_replay "$@" ;;
    log)
	cat "$GIT_DIR/BISECT_LOG" ;;
    run)
        bisect_run "$@" ;;
    *)
        usage ;;
    esac
esac