archive-tar.c: guard config parser from value=NULL
[git] / git-bisect.sh
1 #!/bin/sh
2
3 USAGE='[start|bad|good|skip|next|reset|visualize|replay|log|run]'
4 LONG_USAGE='git bisect start [<bad> [<good>...]] [--] [<pathspec>...]
5         reset bisect state and start bisection.
6 git bisect bad [<rev>]
7         mark <rev> a known-bad revision.
8 git bisect good [<rev>...]
9         mark <rev>... known-good revisions.
10 git bisect skip [<rev>...]
11         mark <rev>... untestable revisions.
12 git bisect next
13         find next bisection to test and check it out.
14 git bisect reset [<branch>]
15         finish bisection search and go back to branch.
16 git bisect visualize
17         show bisect status in gitk.
18 git bisect replay <logfile>
19         replay bisection log.
20 git bisect log
21         show bisect log.
22 git bisect run <cmd>...
23         use <cmd>... to automatically bisect.'
24
25 OPTIONS_SPEC=
26 . git-sh-setup
27 require_work_tree
28
29 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
30 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
31
32 sq() {
33         @@PERL@@ -e '
34                 for (@ARGV) {
35                         s/'\''/'\'\\\\\'\''/g;
36                         print " '\''$_'\''";
37                 }
38                 print "\n";
39         ' "$@"
40 }
41
42 bisect_autostart() {
43         test -f "$GIT_DIR/BISECT_NAMES" || {
44                 echo >&2 'You need to start by "git bisect start"'
45                 if test -t 0
46                 then
47                         echo >&2 -n 'Do you want me to do it for you [Y/n]? '
48                         read yesno
49                         case "$yesno" in
50                         [Nn]*)
51                                 exit ;;
52                         esac
53                         bisect_start
54                 else
55                         exit 1
56                 fi
57         }
58 }
59
60 bisect_start() {
61         #
62         # Verify HEAD. If we were bisecting before this, reset to the
63         # top-of-line master first!
64         #
65         head=$(GIT_DIR="$GIT_DIR" git symbolic-ref HEAD) ||
66         head=$(GIT_DIR="$GIT_DIR" git rev-parse --verify HEAD) ||
67         die "Bad HEAD - I need a HEAD"
68         case "$head" in
69         refs/heads/bisect)
70                 if [ -s "$GIT_DIR/head-name" ]; then
71                     branch=`cat "$GIT_DIR/head-name"`
72                 else
73                     branch=master
74                 fi
75                 git checkout $branch || exit
76                 ;;
77         refs/heads/*|$_x40)
78                 [ -s "$GIT_DIR/head-name" ] && die "won't bisect on seeked tree"
79                 echo "${head#refs/heads/}" >"$GIT_DIR/head-name"
80                 ;;
81         *)
82                 die "Bad HEAD - strange symbolic ref"
83                 ;;
84         esac
85
86         #
87         # Get rid of any old bisect state
88         #
89         bisect_clean_state
90
91         #
92         # Check for one bad and then some good revisions.
93         #
94         has_double_dash=0
95         for arg; do
96             case "$arg" in --) has_double_dash=1; break ;; esac
97         done
98         orig_args=$(sq "$@")
99         bad_seen=0
100         while [ $# -gt 0 ]; do
101             arg="$1"
102             case "$arg" in
103             --)
104                 shift
105                 break
106                 ;;
107             *)
108                 rev=$(git rev-parse --verify "$arg^{commit}" 2>/dev/null) || {
109                     test $has_double_dash -eq 1 &&
110                         die "'$arg' does not appear to be a valid revision"
111                     break
112                 }
113                 case $bad_seen in
114                 0) state='bad' ; bad_seen=1 ;;
115                 *) state='good' ;;
116                 esac
117                 bisect_write "$state" "$rev" 'nolog'
118                 shift
119                 ;;
120             esac
121         done
122
123         sq "$@" >"$GIT_DIR/BISECT_NAMES"
124         echo "git-bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG"
125         bisect_auto_next
126 }
127
128 bisect_write() {
129         state="$1"
130         rev="$2"
131         nolog="$3"
132         case "$state" in
133                 bad)            tag="$state" ;;
134                 good|skip)      tag="$state"-"$rev" ;;
135                 *)              die "Bad bisect_write argument: $state" ;;
136         esac
137         git update-ref "refs/bisect/$tag" "$rev"
138         echo "# $state: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
139         test -z "$nolog" && echo "git-bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
140 }
141
142 bisect_state() {
143         bisect_autostart
144         state=$1
145         case "$#,$state" in
146         0,*)
147                 die "Please call 'bisect_state' with at least one argument." ;;
148         1,bad|1,good|1,skip)
149                 rev=$(git rev-parse --verify HEAD) ||
150                         die "Bad rev input: HEAD"
151                 bisect_write "$state" "$rev" ;;
152         2,bad)
153                 rev=$(git rev-parse --verify "$2^{commit}") ||
154                         die "Bad rev input: $2"
155                 bisect_write "$state" "$rev" ;;
156         *,good|*,skip)
157                 shift
158                 revs=$(git rev-parse --revs-only --no-flags "$@") &&
159                         test '' != "$revs" || die "Bad rev input: $@"
160                 for rev in $revs
161                 do
162                         rev=$(git rev-parse --verify "$rev^{commit}") ||
163                                 die "Bad rev commit: $rev^{commit}"
164                         bisect_write "$state" "$rev"
165                 done ;;
166         *)
167                 usage ;;
168         esac
169         bisect_auto_next
170 }
171
172 bisect_next_check() {
173         missing_good= missing_bad=
174         git show-ref -q --verify refs/bisect/bad || missing_bad=t
175         test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
176
177         case "$missing_good,$missing_bad,$1" in
178         ,,*)
179                 : have both good and bad - ok
180                 ;;
181         *,)
182                 # do not have both but not asked to fail - just report.
183                 false
184                 ;;
185         t,,good)
186                 # have bad but not good.  we could bisect although
187                 # this is less optimum.
188                 echo >&2 'Warning: bisecting only with a bad commit.'
189                 if test -t 0
190                 then
191                         printf >&2 'Are you sure [Y/n]? '
192                         case "$(read yesno)" in [Nn]*) exit 1 ;; esac
193                 fi
194                 : bisect without good...
195                 ;;
196         *)
197                 THEN=''
198                 test -f "$GIT_DIR/BISECT_NAMES" || {
199                         echo >&2 'You need to start by "git bisect start".'
200                         THEN='then '
201                 }
202                 echo >&2 'You '$THEN'need to give me at least one good' \
203                         'and one bad revisions.'
204                 echo >&2 '(You can use "git bisect bad" and' \
205                         '"git bisect good" for that.)'
206                 exit 1 ;;
207         esac
208 }
209
210 bisect_auto_next() {
211         bisect_next_check && bisect_next || :
212 }
213
214 filter_skipped() {
215         _eval="$1"
216         _skip="$2"
217
218         if [ -z "$_skip" ]; then
219                 eval $_eval
220                 return
221         fi
222
223         # Let's parse the output of:
224         # "git rev-list --bisect-vars --bisect-all ..."
225         eval $_eval | while read hash line
226         do
227                 case "$VARS,$FOUND,$TRIED,$hash" in
228                         # We display some vars.
229                         1,*,*,*) echo "$hash $line" ;;
230
231                         # Split line.
232                         ,*,*,---*) ;;
233
234                         # We had nothing to search.
235                         ,,,bisect_rev*)
236                                 echo "bisect_rev="
237                                 VARS=1
238                                 ;;
239
240                         # We did not find a good bisect rev.
241                         # This should happen only if the "bad"
242                         # commit is also a "skip" commit.
243                         ,,*,bisect_rev*)
244                                 echo "bisect_rev=$TRIED"
245                                 VARS=1
246                                 ;;
247
248                         # We are searching.
249                         ,,*,*)
250                                 TRIED="${TRIED:+$TRIED|}$hash"
251                                 case "$_skip" in
252                                 *$hash*) ;;
253                                 *)
254                                         echo "bisect_rev=$hash"
255                                         echo "bisect_tried=\"$TRIED\""
256                                         FOUND=1
257                                         ;;
258                                 esac
259                                 ;;
260
261                         # We have already found a rev to be tested.
262                         ,1,*,bisect_rev*) VARS=1 ;;
263                         ,1,*,*) ;;
264
265                         # ???
266                         *) die "filter_skipped error " \
267                             "VARS: '$VARS' " \
268                             "FOUND: '$FOUND' " \
269                             "TRIED: '$TRIED' " \
270                             "hash: '$hash' " \
271                             "line: '$line'"
272                         ;;
273                 esac
274         done
275 }
276
277 exit_if_skipped_commits () {
278         _tried=$1
279         if expr "$_tried" : ".*[|].*" > /dev/null ; then
280                 echo "There are only 'skip'ped commit left to test."
281                 echo "The first bad commit could be any of:"
282                 echo "$_tried" | tr '[|]' '[\012]'
283                 echo "We cannot bisect more!"
284                 exit 2
285         fi
286 }
287
288 bisect_next() {
289         case "$#" in 0) ;; *) usage ;; esac
290         bisect_autostart
291         bisect_next_check good
292
293         skip=$(git for-each-ref --format='%(objectname)' \
294                 "refs/bisect/skip-*" | tr '[\012]' ' ') || exit
295
296         BISECT_OPT=''
297         test -n "$skip" && BISECT_OPT='--bisect-all'
298
299         bad=$(git rev-parse --verify refs/bisect/bad) &&
300         good=$(git for-each-ref --format='^%(objectname)' \
301                 "refs/bisect/good-*" | tr '[\012]' ' ') &&
302         eval="git rev-list --bisect-vars $BISECT_OPT $good $bad --" &&
303         eval="$eval $(cat "$GIT_DIR/BISECT_NAMES")" &&
304         eval=$(filter_skipped "$eval" "$skip") &&
305         eval "$eval" || exit
306
307         if [ -z "$bisect_rev" ]; then
308                 echo "$bad was both good and bad"
309                 exit 1
310         fi
311         if [ "$bisect_rev" = "$bad" ]; then
312                 exit_if_skipped_commits "$bisect_tried"
313                 echo "$bisect_rev is first bad commit"
314                 git diff-tree --pretty $bisect_rev
315                 exit 0
316         fi
317
318         # We should exit here only if the "bad"
319         # commit is also a "skip" commit (see above).
320         exit_if_skipped_commits "$bisect_rev"
321
322         echo "Bisecting: $bisect_nr revisions left to test after this"
323         git branch -f new-bisect "$bisect_rev"
324         git checkout -q new-bisect || exit
325         git branch -M new-bisect bisect
326         git show-branch "$bisect_rev"
327 }
328
329 bisect_visualize() {
330         bisect_next_check fail
331
332         if test $# = 0
333         then
334                 case "${DISPLAY+set}" in
335                 '')     set git log ;;
336                 set)    set gitk ;;
337                 esac
338         else
339                 case "$1" in
340                 git*|tig) ;;
341                 -*)     set git log "$@" ;;
342                 *)      set git "$@" ;;
343                 esac
344         fi
345
346         not=$(git for-each-ref --format='%(refname)' "refs/bisect/good-*")
347         eval '"$@"' refs/bisect/bad --not $not -- $(cat "$GIT_DIR/BISECT_NAMES")
348 }
349
350 bisect_reset() {
351         test -f "$GIT_DIR/BISECT_NAMES" || {
352                 echo "We are not bisecting."
353                 return
354         }
355         case "$#" in
356         0) if [ -s "$GIT_DIR/head-name" ]; then
357                branch=`cat "$GIT_DIR/head-name"`
358            else
359                branch=master
360            fi ;;
361         1) git show-ref --verify --quiet -- "refs/heads/$1" ||
362                die "$1 does not seem to be a valid branch"
363            branch="$1" ;;
364         *)
365             usage ;;
366         esac
367         if git checkout "$branch"; then
368                 rm -f "$GIT_DIR/head-name"
369                 bisect_clean_state
370         fi
371 }
372
373 bisect_clean_state() {
374         # There may be some refs packed during bisection.
375         git for-each-ref --format='%(refname) %(objectname)' refs/bisect/\* refs/heads/bisect |
376         while read ref hash
377         do
378                 git update-ref -d $ref $hash
379         done
380         rm -f "$GIT_DIR/BISECT_LOG"
381         rm -f "$GIT_DIR/BISECT_NAMES"
382         rm -f "$GIT_DIR/BISECT_RUN"
383 }
384
385 bisect_replay () {
386         test -r "$1" || die "cannot read $1 for replaying"
387         bisect_reset
388         while read bisect command rev
389         do
390                 test "$bisect" = "git-bisect" || continue
391                 case "$command" in
392                 start)
393                         cmd="bisect_start $rev"
394                         eval "$cmd" ;;
395                 good|bad|skip)
396                         bisect_write "$command" "$rev" ;;
397                 *)
398                         die "?? what are you talking about?" ;;
399                 esac
400         done <"$1"
401         bisect_auto_next
402 }
403
404 bisect_run () {
405     bisect_next_check fail
406
407     while true
408     do
409       echo "running $@"
410       "$@"
411       res=$?
412
413       # Check for really bad run error.
414       if [ $res -lt 0 -o $res -ge 128 ]; then
415           echo >&2 "bisect run failed:"
416           echo >&2 "exit code $res from '$@' is < 0 or >= 128"
417           exit $res
418       fi
419
420       # Find current state depending on run success or failure.
421       # A special exit code of 125 means cannot test.
422       if [ $res -eq 125 ]; then
423           state='skip'
424       elif [ $res -gt 0 ]; then
425           state='bad'
426       else
427           state='good'
428       fi
429
430       # We have to use a subshell because "bisect_state" can exit.
431       ( bisect_state $state > "$GIT_DIR/BISECT_RUN" )
432       res=$?
433
434       cat "$GIT_DIR/BISECT_RUN"
435
436       if grep "first bad commit could be any of" "$GIT_DIR/BISECT_RUN" \
437                 > /dev/null; then
438           echo >&2 "bisect run cannot continue any more"
439           exit $res
440       fi
441
442       if [ $res -ne 0 ]; then
443           echo >&2 "bisect run failed:"
444           echo >&2 "'bisect_state $state' exited with error code $res"
445           exit $res
446       fi
447
448       if grep "is first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
449           echo "bisect run success"
450           exit 0;
451       fi
452
453     done
454 }
455
456
457 case "$#" in
458 0)
459     usage ;;
460 *)
461     cmd="$1"
462     shift
463     case "$cmd" in
464     start)
465         bisect_start "$@" ;;
466     bad|good|skip)
467         bisect_state "$cmd" "$@" ;;
468     next)
469         # Not sure we want "next" at the UI level anymore.
470         bisect_next "$@" ;;
471     visualize|view)
472         bisect_visualize "$@" ;;
473     reset)
474         bisect_reset "$@" ;;
475     replay)
476         bisect_replay "$@" ;;
477     log)
478         cat "$GIT_DIR/BISECT_LOG" ;;
479     run)
480         bisect_run "$@" ;;
481     *)
482         usage ;;
483     esac
484 esac