Merge branch 'cb/maint-orphan-merge-noclobber'
[git/kirr.git] / git-bisect.sh
blobc21e33c8d133af0e9e0ae3edaffd0a5593ff4ac3
1 #!/bin/sh
3 USAGE='[help|start|bad|good|skip|next|reset|visualize|replay|log|run]'
4 LONG_USAGE='git bisect help
5 print this long help message.
6 git bisect start [<bad> [<good>...]] [--] [<pathspec>...]
7 reset bisect state and start bisection.
8 git bisect bad [<rev>]
9 mark <rev> a known-bad revision.
10 git bisect good [<rev>...]
11 mark <rev>... known-good revisions.
12 git bisect skip [(<rev>|<range>)...]
13 mark <rev>... untestable revisions.
14 git bisect next
15 find next bisection to test and check it out.
16 git bisect reset [<commit>]
17 finish bisection search and go back to commit.
18 git bisect visualize
19 show bisect status in gitk.
20 git bisect replay <logfile>
21 replay bisection log.
22 git bisect log
23 show bisect log.
24 git bisect run <cmd>...
25 use <cmd>... to automatically bisect.
27 Please use "git help bisect" to get the full man page.'
29 OPTIONS_SPEC=
30 . git-sh-setup
31 require_work_tree
33 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
34 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
36 bisect_autostart() {
37 test -s "$GIT_DIR/BISECT_START" || {
38 echo >&2 'You need to start by "git bisect start"'
39 if test -t 0
40 then
41 echo >&2 -n 'Do you want me to do it for you [Y/n]? '
42 read yesno
43 case "$yesno" in
44 [Nn]*)
45 exit ;;
46 esac
47 bisect_start
48 else
49 exit 1
54 bisect_start() {
56 # Verify HEAD.
58 head=$(GIT_DIR="$GIT_DIR" git symbolic-ref -q HEAD) ||
59 head=$(GIT_DIR="$GIT_DIR" git rev-parse --verify HEAD) ||
60 die "Bad HEAD - I need a HEAD"
63 # Check if we are bisecting.
65 start_head=''
66 if test -s "$GIT_DIR/BISECT_START"
67 then
68 # Reset to the rev from where we started.
69 start_head=$(cat "$GIT_DIR/BISECT_START")
70 git checkout "$start_head" -- || exit
71 else
72 # Get rev from where we start.
73 case "$head" in
74 refs/heads/*|$_x40)
75 # This error message should only be triggered by
76 # cogito usage, and cogito users should understand
77 # it relates to cg-seek.
78 [ -s "$GIT_DIR/head-name" ] &&
79 die "won't bisect on seeked tree"
80 start_head="${head#refs/heads/}"
83 die "Bad HEAD - strange symbolic ref"
85 esac
89 # Get rid of any old bisect state.
91 bisect_clean_state || exit
94 # Check for one bad and then some good revisions.
96 has_double_dash=0
97 for arg; do
98 case "$arg" in --) has_double_dash=1; break ;; esac
99 done
100 orig_args=$(git rev-parse --sq-quote "$@")
101 bad_seen=0
102 eval=''
103 while [ $# -gt 0 ]; do
104 arg="$1"
105 case "$arg" in
107 shift
108 break
111 rev=$(git rev-parse -q --verify "$arg^{commit}") || {
112 test $has_double_dash -eq 1 &&
113 die "'$arg' does not appear to be a valid revision"
114 break
116 case $bad_seen in
117 0) state='bad' ; bad_seen=1 ;;
118 *) state='good' ;;
119 esac
120 eval="$eval bisect_write '$state' '$rev' 'nolog'; "
121 shift
123 esac
124 done
127 # Change state.
128 # In case of mistaken revs or checkout error, or signals received,
129 # "bisect_auto_next" below may exit or misbehave.
130 # We have to trap this to be able to clean up using
131 # "bisect_clean_state".
133 trap 'bisect_clean_state' 0
134 trap 'exit 255' 1 2 3 15
137 # Write new start state.
139 echo "$start_head" >"$GIT_DIR/BISECT_START" &&
140 git rev-parse --sq-quote "$@" >"$GIT_DIR/BISECT_NAMES" &&
141 eval "$eval" &&
142 echo "git bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG" || exit
144 # Check if we can proceed to the next bisect state.
146 bisect_auto_next
148 trap '-' 0
151 bisect_write() {
152 state="$1"
153 rev="$2"
154 nolog="$3"
155 case "$state" in
156 bad) tag="$state" ;;
157 good|skip) tag="$state"-"$rev" ;;
158 *) die "Bad bisect_write argument: $state" ;;
159 esac
160 git update-ref "refs/bisect/$tag" "$rev" || exit
161 echo "# $state: $(git show-branch $rev)" >>"$GIT_DIR/BISECT_LOG"
162 test -n "$nolog" || echo "git bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
165 is_expected_rev() {
166 test -f "$GIT_DIR/BISECT_EXPECTED_REV" &&
167 test "$1" = $(cat "$GIT_DIR/BISECT_EXPECTED_REV")
170 check_expected_revs() {
171 for _rev in "$@"; do
172 if ! is_expected_rev "$_rev"; then
173 rm -f "$GIT_DIR/BISECT_ANCESTORS_OK"
174 rm -f "$GIT_DIR/BISECT_EXPECTED_REV"
175 return
177 done
180 bisect_skip() {
181 all=''
182 for arg in "$@"
184 case "$arg" in
185 *..*)
186 revs=$(git rev-list "$arg") || die "Bad rev input: $arg" ;;
188 revs=$(git rev-parse --sq-quote "$arg") ;;
189 esac
190 all="$all $revs"
191 done
192 eval bisect_state 'skip' $all
195 bisect_state() {
196 bisect_autostart
197 state=$1
198 case "$#,$state" in
199 0,*)
200 die "Please call 'bisect_state' with at least one argument." ;;
201 1,bad|1,good|1,skip)
202 rev=$(git rev-parse --verify HEAD) ||
203 die "Bad rev input: HEAD"
204 bisect_write "$state" "$rev"
205 check_expected_revs "$rev" ;;
206 2,bad|*,good|*,skip)
207 shift
208 eval=''
209 for rev in "$@"
211 sha=$(git rev-parse --verify "$rev^{commit}") ||
212 die "Bad rev input: $rev"
213 eval="$eval bisect_write '$state' '$sha'; "
214 done
215 eval "$eval"
216 check_expected_revs "$@" ;;
217 *,bad)
218 die "'git bisect bad' can take only one argument." ;;
220 usage ;;
221 esac
222 bisect_auto_next
225 bisect_next_check() {
226 missing_good= missing_bad=
227 git show-ref -q --verify refs/bisect/bad || missing_bad=t
228 test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
230 case "$missing_good,$missing_bad,$1" in
231 ,,*)
232 : have both good and bad - ok
235 # do not have both but not asked to fail - just report.
236 false
238 t,,good)
239 # have bad but not good. we could bisect although
240 # this is less optimum.
241 echo >&2 'Warning: bisecting only with a bad commit.'
242 if test -t 0
243 then
244 printf >&2 'Are you sure [Y/n]? '
245 read yesno
246 case "$yesno" in [Nn]*) exit 1 ;; esac
248 : bisect without good...
251 THEN=''
252 test -s "$GIT_DIR/BISECT_START" || {
253 echo >&2 'You need to start by "git bisect start".'
254 THEN='then '
256 echo >&2 'You '$THEN'need to give me at least one good' \
257 'and one bad revisions.'
258 echo >&2 '(You can use "git bisect bad" and' \
259 '"git bisect good" for that.)'
260 exit 1 ;;
261 esac
264 bisect_auto_next() {
265 bisect_next_check && bisect_next || :
268 bisect_next() {
269 case "$#" in 0) ;; *) usage ;; esac
270 bisect_autostart
271 bisect_next_check good
273 # Perform all bisection computation, display and checkout
274 git bisect--helper --next-all
275 res=$?
277 # Check if we should exit because bisection is finished
278 test $res -eq 10 && exit 0
280 # Check for an error in the bisection process
281 test $res -ne 0 && exit $res
283 return 0
286 bisect_visualize() {
287 bisect_next_check fail
289 if test $# = 0
290 then
291 case "${DISPLAY+set}${SESSIONNAME+set}${MSYSTEM+set}${SECURITYSESSIONID+set}" in
292 '') set git log ;;
293 set*) set gitk ;;
294 esac
295 else
296 case "$1" in
297 git*|tig) ;;
298 -*) set git log "$@" ;;
299 *) set git "$@" ;;
300 esac
303 eval '"$@"' --bisect -- $(cat "$GIT_DIR/BISECT_NAMES")
306 bisect_reset() {
307 test -s "$GIT_DIR/BISECT_START" || {
308 echo "We are not bisecting."
309 return
311 case "$#" in
312 0) branch=$(cat "$GIT_DIR/BISECT_START") ;;
313 1) git rev-parse --quiet --verify "$1^{commit}" > /dev/null ||
314 die "'$1' is not a valid commit"
315 branch="$1" ;;
317 usage ;;
318 esac
319 if git checkout "$branch" -- ; then
320 bisect_clean_state
321 else
322 die "Could not check out original HEAD '$branch'." \
323 "Try 'git bisect reset <commit>'."
327 bisect_clean_state() {
328 # There may be some refs packed during bisection.
329 git for-each-ref --format='%(refname) %(objectname)' refs/bisect/\* |
330 while read ref hash
332 git update-ref -d $ref $hash || exit
333 done
334 rm -f "$GIT_DIR/BISECT_EXPECTED_REV" &&
335 rm -f "$GIT_DIR/BISECT_ANCESTORS_OK" &&
336 rm -f "$GIT_DIR/BISECT_LOG" &&
337 rm -f "$GIT_DIR/BISECT_NAMES" &&
338 rm -f "$GIT_DIR/BISECT_RUN" &&
339 # Cleanup head-name if it got left by an old version of git-bisect
340 rm -f "$GIT_DIR/head-name" &&
342 rm -f "$GIT_DIR/BISECT_START"
345 bisect_replay () {
346 test "$#" -eq 1 || die "No logfile given"
347 test -r "$1" || die "cannot read $1 for replaying"
348 bisect_reset
349 while read git bisect command rev
351 test "$git $bisect" = "git bisect" -o "$git" = "git-bisect" || continue
352 if test "$git" = "git-bisect"; then
353 rev="$command"
354 command="$bisect"
356 case "$command" in
357 start)
358 cmd="bisect_start $rev"
359 eval "$cmd" ;;
360 good|bad|skip)
361 bisect_write "$command" "$rev" ;;
363 die "?? what are you talking about?" ;;
364 esac
365 done <"$1"
366 bisect_auto_next
369 bisect_run () {
370 bisect_next_check fail
372 while true
374 echo "running $@"
375 "$@"
376 res=$?
378 # Check for really bad run error.
379 if [ $res -lt 0 -o $res -ge 128 ]; then
380 echo >&2 "bisect run failed:"
381 echo >&2 "exit code $res from '$@' is < 0 or >= 128"
382 exit $res
385 # Find current state depending on run success or failure.
386 # A special exit code of 125 means cannot test.
387 if [ $res -eq 125 ]; then
388 state='skip'
389 elif [ $res -gt 0 ]; then
390 state='bad'
391 else
392 state='good'
395 # We have to use a subshell because "bisect_state" can exit.
396 ( bisect_state $state > "$GIT_DIR/BISECT_RUN" )
397 res=$?
399 cat "$GIT_DIR/BISECT_RUN"
401 if sane_grep "first bad commit could be any of" "$GIT_DIR/BISECT_RUN" \
402 > /dev/null; then
403 echo >&2 "bisect run cannot continue any more"
404 exit $res
407 if [ $res -ne 0 ]; then
408 echo >&2 "bisect run failed:"
409 echo >&2 "'bisect_state $state' exited with error code $res"
410 exit $res
413 if sane_grep "is the first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
414 echo "bisect run success"
415 exit 0;
418 done
421 bisect_log () {
422 test -s "$GIT_DIR/BISECT_LOG" || die "We are not bisecting."
423 cat "$GIT_DIR/BISECT_LOG"
426 case "$#" in
428 usage ;;
430 cmd="$1"
431 shift
432 case "$cmd" in
433 help)
434 git bisect -h ;;
435 start)
436 bisect_start "$@" ;;
437 bad|good)
438 bisect_state "$cmd" "$@" ;;
439 skip)
440 bisect_skip "$@" ;;
441 next)
442 # Not sure we want "next" at the UI level anymore.
443 bisect_next "$@" ;;
444 visualize|view)
445 bisect_visualize "$@" ;;
446 reset)
447 bisect_reset "$@" ;;
448 replay)
449 bisect_replay "$@" ;;
450 log)
451 bisect_log ;;
452 run)
453 bisect_run "$@" ;;
455 usage ;;
456 esac
457 esac