builtin-apply: stronger indent-with-on-tab fixing
[git/jbf-maint.git] / git-bisect.sh
blob5385249890698632dedcaf8dda03d865f66abca9
1 #!/bin/sh
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.'
25 OPTIONS_SPEC=
26 . git-sh-setup
27 require_work_tree
29 sq() {
30 @@PERL@@ -e '
31 for (@ARGV) {
32 s/'\''/'\'\\\\\'\''/g;
33 print " '\''$_'\''";
35 print "\n";
36 ' "$@"
39 bisect_autostart() {
40 test -f "$GIT_DIR/BISECT_NAMES" || {
41 echo >&2 'You need to start by "git bisect start"'
42 if test -t 0
43 then
44 echo >&2 -n 'Do you want me to do it for you [Y/n]? '
45 read yesno
46 case "$yesno" in
47 [Nn]*)
48 exit ;;
49 esac
50 bisect_start
51 else
52 exit 1
57 bisect_start() {
59 # Verify HEAD. If we were bisecting before this, reset to the
60 # top-of-line master first!
62 head=$(GIT_DIR="$GIT_DIR" git symbolic-ref HEAD) ||
63 die "Bad HEAD - I need a symbolic ref"
64 case "$head" in
65 refs/heads/bisect)
66 if [ -s "$GIT_DIR/head-name" ]; then
67 branch=`cat "$GIT_DIR/head-name"`
68 else
69 branch=master
71 git checkout $branch || exit
73 refs/heads/*)
74 [ -s "$GIT_DIR/head-name" ] && die "won't bisect on seeked tree"
75 echo "${head#refs/heads/}" >"$GIT_DIR/head-name"
78 die "Bad HEAD - strange symbolic ref"
80 esac
83 # Get rid of any old bisect state
85 bisect_clean_state
88 # Check for one bad and then some good revisions.
90 has_double_dash=0
91 for arg; do
92 case "$arg" in --) has_double_dash=1; break ;; esac
93 done
94 orig_args=$(sq "$@")
95 bad_seen=0
96 while [ $# -gt 0 ]; do
97 arg="$1"
98 case "$arg" in
99 --)
100 shift
101 break
104 rev=$(git rev-parse --verify "$arg^{commit}" 2>/dev/null) || {
105 test $has_double_dash -eq 1 &&
106 die "'$arg' does not appear to be a valid revision"
107 break
109 case $bad_seen in
110 0) state='bad' ; bad_seen=1 ;;
111 *) state='good' ;;
112 esac
113 bisect_write "$state" "$rev" 'nolog'
114 shift
116 esac
117 done
119 sq "$@" >"$GIT_DIR/BISECT_NAMES"
120 echo "git-bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG"
121 bisect_auto_next
124 bisect_write() {
125 state="$1"
126 rev="$2"
127 nolog="$3"
128 case "$state" in
129 bad) tag="$state" ;;
130 good|skip) tag="$state"-"$rev" ;;
131 *) die "Bad bisect_write argument: $state" ;;
132 esac
133 git update-ref "refs/bisect/$tag" "$rev"
134 echo "# $state: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
135 test -z "$nolog" && echo "git-bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
138 bisect_state() {
139 bisect_autostart
140 state=$1
141 case "$#,$state" in
142 0,*)
143 die "Please call 'bisect_state' with at least one argument." ;;
144 1,bad|1,good|1,skip)
145 rev=$(git rev-parse --verify HEAD) ||
146 die "Bad rev input: HEAD"
147 bisect_write "$state" "$rev" ;;
148 2,bad)
149 rev=$(git rev-parse --verify "$2^{commit}") ||
150 die "Bad rev input: $2"
151 bisect_write "$state" "$rev" ;;
152 *,good|*,skip)
153 shift
154 revs=$(git rev-parse --revs-only --no-flags "$@") &&
155 test '' != "$revs" || die "Bad rev input: $@"
156 for rev in $revs
158 rev=$(git rev-parse --verify "$rev^{commit}") ||
159 die "Bad rev commit: $rev^{commit}"
160 bisect_write "$state" "$rev"
161 done ;;
163 usage ;;
164 esac
165 bisect_auto_next
168 bisect_next_check() {
169 missing_good= missing_bad=
170 git show-ref -q --verify refs/bisect/bad || missing_bad=t
171 test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
173 case "$missing_good,$missing_bad,$1" in
174 ,,*)
175 : have both good and bad - ok
178 # do not have both but not asked to fail - just report.
179 false
181 t,,good)
182 # have bad but not good. we could bisect although
183 # this is less optimum.
184 echo >&2 'Warning: bisecting only with a bad commit.'
185 if test -t 0
186 then
187 printf >&2 'Are you sure [Y/n]? '
188 case "$(read yesno)" in [Nn]*) exit 1 ;; esac
190 : bisect without good...
193 THEN=''
194 test -f "$GIT_DIR/BISECT_NAMES" || {
195 echo >&2 'You need to start by "git bisect start".'
196 THEN='then '
198 echo >&2 'You '$THEN'need to give me at least one good' \
199 'and one bad revisions.'
200 echo >&2 '(You can use "git bisect bad" and' \
201 '"git bisect good" for that.)'
202 exit 1 ;;
203 esac
206 bisect_auto_next() {
207 bisect_next_check && bisect_next || :
210 filter_skipped() {
211 _eval="$1"
212 _skip="$2"
214 if [ -z "$_skip" ]; then
215 eval $_eval
216 return
219 # Let's parse the output of:
220 # "git rev-list --bisect-vars --bisect-all ..."
221 eval $_eval | while read hash line
223 case "$VARS,$FOUND,$TRIED,$hash" in
224 # We display some vars.
225 1,*,*,*) echo "$hash $line" ;;
227 # Split line.
228 ,*,*,---*) ;;
230 # We had nothing to search.
231 ,,,bisect_rev*)
232 echo "bisect_rev="
233 VARS=1
236 # We did not find a good bisect rev.
237 # This should happen only if the "bad"
238 # commit is also a "skip" commit.
239 ,,*,bisect_rev*)
240 echo "bisect_rev=$TRIED"
241 VARS=1
244 # We are searching.
245 ,,*,*)
246 TRIED="${TRIED:+$TRIED|}$hash"
247 case "$_skip" in
248 *$hash*) ;;
250 echo "bisect_rev=$hash"
251 echo "bisect_tried=\"$TRIED\""
252 FOUND=1
254 esac
257 # We have already found a rev to be tested.
258 ,1,*,bisect_rev*) VARS=1 ;;
259 ,1,*,*) ;;
261 # ???
262 *) die "filter_skipped error " \
263 "VARS: '$VARS' " \
264 "FOUND: '$FOUND' " \
265 "TRIED: '$TRIED' " \
266 "hash: '$hash' " \
267 "line: '$line'"
269 esac
270 done
273 exit_if_skipped_commits () {
274 _tried=$1
275 if expr "$_tried" : ".*[|].*" > /dev/null ; then
276 echo "There are only 'skip'ped commit left to test."
277 echo "The first bad commit could be any of:"
278 echo "$_tried" | tr '[|]' '[\012]'
279 echo "We cannot bisect more!"
280 exit 2
284 bisect_next() {
285 case "$#" in 0) ;; *) usage ;; esac
286 bisect_autostart
287 bisect_next_check good
289 skip=$(git for-each-ref --format='%(objectname)' \
290 "refs/bisect/skip-*" | tr '[\012]' ' ') || exit
292 BISECT_OPT=''
293 test -n "$skip" && BISECT_OPT='--bisect-all'
295 bad=$(git rev-parse --verify refs/bisect/bad) &&
296 good=$(git for-each-ref --format='^%(objectname)' \
297 "refs/bisect/good-*" | tr '[\012]' ' ') &&
298 eval="git rev-list --bisect-vars $BISECT_OPT $good $bad --" &&
299 eval="$eval $(cat "$GIT_DIR/BISECT_NAMES")" &&
300 eval=$(filter_skipped "$eval" "$skip") &&
301 eval "$eval" || exit
303 if [ -z "$bisect_rev" ]; then
304 echo "$bad was both good and bad"
305 exit 1
307 if [ "$bisect_rev" = "$bad" ]; then
308 exit_if_skipped_commits "$bisect_tried"
309 echo "$bisect_rev is first bad commit"
310 git diff-tree --pretty $bisect_rev
311 exit 0
314 # We should exit here only if the "bad"
315 # commit is also a "skip" commit (see above).
316 exit_if_skipped_commits "$bisect_rev"
318 echo "Bisecting: $bisect_nr revisions left to test after this"
319 git branch -f new-bisect "$bisect_rev"
320 git checkout -q new-bisect || exit
321 git branch -M new-bisect bisect
322 git show-branch "$bisect_rev"
325 bisect_visualize() {
326 bisect_next_check fail
328 if test $# = 0
329 then
330 case "${DISPLAY+set}" in
331 '') set git log ;;
332 set) set gitk ;;
333 esac
334 else
335 case "$1" in
336 git*|tig) ;;
337 -*) set git log "$@" ;;
338 *) set git "$@" ;;
339 esac
342 not=$(git for-each-ref --format='%(refname)' "refs/bisect/good-*")
343 eval '"$@"' refs/bisect/bad --not $not -- $(cat "$GIT_DIR/BISECT_NAMES")
346 bisect_reset() {
347 test -f "$GIT_DIR/BISECT_NAMES" || {
348 echo "We are not bisecting."
349 return
351 case "$#" in
352 0) if [ -s "$GIT_DIR/head-name" ]; then
353 branch=`cat "$GIT_DIR/head-name"`
354 else
355 branch=master
356 fi ;;
357 1) git show-ref --verify --quiet -- "refs/heads/$1" ||
358 die "$1 does not seem to be a valid branch"
359 branch="$1" ;;
361 usage ;;
362 esac
363 if git checkout "$branch"; then
364 rm -f "$GIT_DIR/head-name"
365 bisect_clean_state
369 bisect_clean_state() {
370 # There may be some refs packed during bisection.
371 git for-each-ref --format='%(refname) %(objectname)' refs/bisect/\* refs/heads/bisect |
372 while read ref hash
374 git update-ref -d $ref $hash
375 done
376 rm -f "$GIT_DIR/BISECT_LOG"
377 rm -f "$GIT_DIR/BISECT_NAMES"
378 rm -f "$GIT_DIR/BISECT_RUN"
381 bisect_replay () {
382 test -r "$1" || die "cannot read $1 for replaying"
383 bisect_reset
384 while read bisect command rev
386 test "$bisect" = "git-bisect" || continue
387 case "$command" in
388 start)
389 cmd="bisect_start $rev"
390 eval "$cmd" ;;
391 good|bad|skip)
392 bisect_write "$command" "$rev" ;;
394 die "?? what are you talking about?" ;;
395 esac
396 done <"$1"
397 bisect_auto_next
400 bisect_run () {
401 bisect_next_check fail
403 while true
405 echo "running $@"
406 "$@"
407 res=$?
409 # Check for really bad run error.
410 if [ $res -lt 0 -o $res -ge 128 ]; then
411 echo >&2 "bisect run failed:"
412 echo >&2 "exit code $res from '$@' is < 0 or >= 128"
413 exit $res
416 # Find current state depending on run success or failure.
417 # A special exit code of 125 means cannot test.
418 if [ $res -eq 125 ]; then
419 state='skip'
420 elif [ $res -gt 0 ]; then
421 state='bad'
422 else
423 state='good'
426 # We have to use a subshell because "bisect_state" can exit.
427 ( bisect_state $state > "$GIT_DIR/BISECT_RUN" )
428 res=$?
430 cat "$GIT_DIR/BISECT_RUN"
432 if grep "first bad commit could be any of" "$GIT_DIR/BISECT_RUN" \
433 > /dev/null; then
434 echo >&2 "bisect run cannot continue any more"
435 exit $res
438 if [ $res -ne 0 ]; then
439 echo >&2 "bisect run failed:"
440 echo >&2 "'bisect_state $state' exited with error code $res"
441 exit $res
444 if grep "is first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
445 echo "bisect run success"
446 exit 0;
449 done
453 case "$#" in
455 usage ;;
457 cmd="$1"
458 shift
459 case "$cmd" in
460 start)
461 bisect_start "$@" ;;
462 bad|good|skip)
463 bisect_state "$cmd" "$@" ;;
464 next)
465 # Not sure we want "next" at the UI level anymore.
466 bisect_next "$@" ;;
467 visualize|view)
468 bisect_visualize "$@" ;;
469 reset)
470 bisect_reset "$@" ;;
471 replay)
472 bisect_replay "$@" ;;
473 log)
474 cat "$GIT_DIR/BISECT_LOG" ;;
475 run)
476 bisect_run "$@" ;;
478 usage ;;
479 esac
480 esac