git-bisect.sh

   1 #!/bin/sh
   2
   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 [--no-checkout] [<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.
  26
  27 Please use "git help bisect" to get the full man page.'
  28
  29 OPTIONS_SPEC=
  30 . git-sh-setup
  31 . git-sh-i18n
  32
  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"
  35 TERM_BAD=bad
  36 TERM_GOOD=good
  37
  38 bisect_head()
  39 {
  40         if test -f "$GIT_DIR/BISECT_HEAD"
  41         then
  42                 echo BISECT_HEAD
  43         else
  44                 echo HEAD
  45         fi
  46 }
  47
  48 bisect_autostart() {
  49         test -s "$GIT_DIR/BISECT_START" || {
  50                 gettextln "You need to start by \"git bisect start\"" >&2
  51                 if test -t 0
  52                 then
  53                         # TRANSLATORS: Make sure to include [Y] and [n] in your
  54                         # translation. The program will only accept English input
  55                         # at this point.
  56                         gettext "Do you want me to do it for you [Y/n]? " >&2
  57                         read yesno
  58                         case "$yesno" in
  59                         [Nn]*)
  60                                 exit ;;
  61                         esac
  62                         bisect_start
  63                 else
  64                         exit 1
  65                 fi
  66         }
  67 }
  68
  69 bisect_start() {
  70         #
  71         # Check for one bad and then some good revisions.
  72         #
  73         has_double_dash=0
  74         for arg; do
  75                 case "$arg" in --) has_double_dash=1; break ;; esac
  76         done
  77         orig_args=$(git rev-parse --sq-quote "$@")
  78         bad_seen=0
  79         eval=''
  80         must_write_terms=0
  81         revs=''
  82         if test "z$(git rev-parse --is-bare-repository)" != zfalse
  83         then
  84                 mode=--no-checkout
  85         else
  86                 mode=''
  87         fi
  88         while [ $# -gt 0 ]; do
  89                 arg="$1"
  90                 case "$arg" in
  91                 --)
  92                         shift
  93                         break
  94                 ;;
  95                 --no-checkout)
  96                         mode=--no-checkout
  97                         shift ;;
  98                 --*)
  99                         die "$(eval_gettext "unrecognised option: '\$arg'")" ;;
 100                 *)
 101                         rev=$(git rev-parse -q --verify "$arg^{commit}") || {
 102                                 test $has_double_dash -eq 1 &&
 103                                 die "$(eval_gettext "'\$arg' does not appear to be a valid revision")"
 104                                 break
 105                         }
 106                         revs="$revs $rev"
 107                         shift
 108                         ;;
 109                 esac
 110         done
 111
 112         for rev in $revs
 113         do
 114                 # The user ran "git bisect start <sha1>
 115                 # <sha1>", hence did not explicitly specify
 116                 # the terms, but we are already starting to
 117                 # set references named with the default terms,
 118                 # and won't be able to change afterwards.
 119                 must_write_terms=1
 120
 121                 case $bad_seen in
 122                 0) state=$TERM_BAD ; bad_seen=1 ;;
 123                 *) state=$TERM_GOOD ;;
 124                 esac
 125                 eval="$eval bisect_write '$state' '$rev' 'nolog' &&"
 126         done
 127         #
 128         # Verify HEAD.
 129         #
 130         head=$(GIT_DIR="$GIT_DIR" git symbolic-ref -q HEAD) ||
 131         head=$(GIT_DIR="$GIT_DIR" git rev-parse --verify HEAD) ||
 132         die "$(gettext "Bad HEAD - I need a HEAD")"
 133
 134         #
 135         # Check if we are bisecting.
 136         #
 137         start_head=''
 138         if test -s "$GIT_DIR/BISECT_START"
 139         then
 140                 # Reset to the rev from where we started.
 141                 start_head=$(cat "$GIT_DIR/BISECT_START")
 142                 if test "z$mode" != "z--no-checkout"
 143                 then
 144                         git checkout "$start_head" -- ||
 145                         die "$(eval_gettext "Checking out '\$start_head' failed. Try 'git bisect reset <valid-branch>'.")"
 146                 fi
 147         else
 148                 # Get rev from where we start.
 149                 case "$head" in
 150                 refs/heads/*|$_x40)
 151                         # This error message should only be triggered by
 152                         # cogito usage, and cogito users should understand
 153                         # it relates to cg-seek.
 154                         [ -s "$GIT_DIR/head-name" ] &&
 155                                 die "$(gettext "won't bisect on cg-seek'ed tree")"
 156                         start_head="${head#refs/heads/}"
 157                         ;;
 158                 *)
 159                         die "$(gettext "Bad HEAD - strange symbolic ref")"
 160                         ;;
 161                 esac
 162         fi
 163
 164         #
 165         # Get rid of any old bisect state.
 166         #
 167         bisect_clean_state || exit
 168
 169         #
 170         # Change state.
 171         # In case of mistaken revs or checkout error, or signals received,
 172         # "bisect_auto_next" below may exit or misbehave.
 173         # We have to trap this to be able to clean up using
 174         # "bisect_clean_state".
 175         #
 176         trap 'bisect_clean_state' 0
 177         trap 'exit 255' 1 2 3 15
 178
 179         #
 180         # Write new start state.
 181         #
 182         echo "$start_head" >"$GIT_DIR/BISECT_START" && {
 183                 test "z$mode" != "z--no-checkout" ||
 184                 git update-ref --no-deref BISECT_HEAD "$start_head"
 185         } &&
 186         git rev-parse --sq-quote "$@" >"$GIT_DIR/BISECT_NAMES" &&
 187         eval "$eval true" &&
 188         if test $must_write_terms -eq 1
 189         then
 190                 write_terms "$TERM_BAD" "$TERM_GOOD"
 191         fi &&
 192         echo "git bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG" || exit
 193         #
 194         # Check if we can proceed to the next bisect state.
 195         #
 196         bisect_auto_next
 197
 198         trap '-' 0
 199 }
 200
 201 bisect_write() {
 202         state="$1"
 203         rev="$2"
 204         nolog="$3"
 205         case "$state" in
 206                 "$TERM_BAD")
 207                         tag="$state" ;;
 208                 "$TERM_GOOD"|skip)
 209                         tag="$state"-"$rev" ;;
 210                 *)
 211                         die "$(eval_gettext "Bad bisect_write argument: \$state")" ;;
 212         esac
 213         git update-ref "refs/bisect/$tag" "$rev" || exit
 214         echo "# $state: $(git show-branch $rev)" >>"$GIT_DIR/BISECT_LOG"
 215         test -n "$nolog" || echo "git bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
 216 }
 217
 218 is_expected_rev() {
 219         test -f "$GIT_DIR/BISECT_EXPECTED_REV" &&
 220         test "$1" = $(cat "$GIT_DIR/BISECT_EXPECTED_REV")
 221 }
 222
 223 check_expected_revs() {
 224         for _rev in "$@"; do
 225                 if ! is_expected_rev "$_rev"
 226                 then
 227                         rm -f "$GIT_DIR/BISECT_ANCESTORS_OK"
 228                         rm -f "$GIT_DIR/BISECT_EXPECTED_REV"
 229                         return
 230                 fi
 231         done
 232 }
 233
 234 bisect_skip() {
 235         all=''
 236         for arg in "$@"
 237         do
 238                 case "$arg" in
 239                 *..*)
 240                         revs=$(git rev-list "$arg") || die "$(eval_gettext "Bad rev input: \$arg")" ;;
 241                 *)
 242                         revs=$(git rev-parse --sq-quote "$arg") ;;
 243                 esac
 244                 all="$all $revs"
 245         done
 246         eval bisect_state 'skip' $all
 247 }
 248
 249 bisect_state() {
 250         bisect_autostart
 251         state=$1
 252         check_and_set_terms $state
 253         case "$#,$state" in
 254         0,*)
 255                 die "$(gettext "Please call 'bisect_state' with at least one argument.")" ;;
 256         1,"$TERM_BAD"|1,"$TERM_GOOD"|1,skip)
 257                 rev=$(git rev-parse --verify $(bisect_head)) ||
 258                         die "$(gettext "Bad rev input: $(bisect_head)")"
 259                 bisect_write "$state" "$rev"
 260                 check_expected_revs "$rev" ;;
 261         2,"$TERM_BAD"|*,"$TERM_GOOD"|*,skip)
 262                 shift
 263                 hash_list=''
 264                 for rev in "$@"
 265                 do
 266                         sha=$(git rev-parse --verify "$rev^{commit}") ||
 267                                 die "$(eval_gettext "Bad rev input: \$rev")"
 268                         hash_list="$hash_list $sha"
 269                 done
 270                 for rev in $hash_list
 271                 do
 272                         bisect_write "$state" "$rev"
 273                 done
 274                 check_expected_revs $hash_list ;;
 275         *,"$TERM_BAD")
 276                 die "$(eval_gettext "'git bisect \$TERM_BAD' can take only one argument.")" ;;
 277         *)
 278                 usage ;;
 279         esac
 280         bisect_auto_next
 281 }
 282
 283 bisect_next_check() {
 284         missing_good= missing_bad=
 285         git show-ref -q --verify refs/bisect/$TERM_BAD || missing_bad=t
 286         test -n "$(git for-each-ref "refs/bisect/$TERM_GOOD-*")" || missing_good=t
 287
 288         case "$missing_good,$missing_bad,$1" in
 289         ,,*)
 290                 : have both $TERM_GOOD and $TERM_BAD - ok
 291                 ;;
 292         *,)
 293                 # do not have both but not asked to fail - just report.
 294                 false
 295                 ;;
 296         t,,"$TERM_GOOD")
 297                 # have bad but not good.  we could bisect although
 298                 # this is less optimum.
 299                 eval_gettextln "Warning: bisecting only with a \$TERM_BAD commit." >&2
 300                 if test -t 0
 301                 then
 302                         # TRANSLATORS: Make sure to include [Y] and [n] in your
 303                         # translation. The program will only accept English input
 304                         # at this point.
 305                         gettext "Are you sure [Y/n]? " >&2
 306                         read yesno
 307                         case "$yesno" in [Nn]*) exit 1 ;; esac
 308                 fi
 309                 : bisect without $TERM_GOOD...
 310                 ;;
 311         *)
 312                 bad_syn=$(bisect_voc bad)
 313                 good_syn=$(bisect_voc good)
 314                 if test -s "$GIT_DIR/BISECT_START"
 315                 then
 316
 317                         eval_gettextln "You need to give me at least one \$bad_syn and one \$good_syn revision.
 318 (You can use \"git bisect \$bad_syn\" and \"git bisect \$good_syn\" for that.)" >&2
 319                 else
 320                         eval_gettextln "You need to start by \"git bisect start\".
 321 You then need to give me at least one \$good_syn and one \$bad_syn revision.
 322 (You can use \"git bisect \$bad_syn\" and \"git bisect \$good_syn\" for that.)" >&2
 323                 fi
 324                 exit 1 ;;
 325         esac
 326 }
 327
 328 bisect_auto_next() {
 329         bisect_next_check && bisect_next || :
 330 }
 331
 332 bisect_next() {
 333         case "$#" in 0) ;; *) usage ;; esac
 334         bisect_autostart
 335         bisect_next_check $TERM_GOOD
 336
 337         # Perform all bisection computation, display and checkout
 338         git bisect--helper --next-all $(test -f "$GIT_DIR/BISECT_HEAD" && echo --no-checkout)
 339         res=$?
 340
 341         # Check if we should exit because bisection is finished
 342         if test $res -eq 10
 343         then
 344                 bad_rev=$(git show-ref --hash --verify refs/bisect/$TERM_BAD)
 345                 bad_commit=$(git show-branch $bad_rev)
 346                 echo "# first $TERM_BAD commit: $bad_commit" >>"$GIT_DIR/BISECT_LOG"
 347                 exit 0
 348         elif test $res -eq 2
 349         then
 350                 echo "# only skipped commits left to test" >>"$GIT_DIR/BISECT_LOG"
 351                 good_revs=$(git for-each-ref --format="%(objectname)" "refs/bisect/$TERM_GOOD-*")
 352                 for skipped in $(git rev-list refs/bisect/$TERM_BAD --not $good_revs)
 353                 do
 354                         skipped_commit=$(git show-branch $skipped)
 355                         echo "# possible first $TERM_BAD commit: $skipped_commit" >>"$GIT_DIR/BISECT_LOG"
 356                 done
 357                 exit $res
 358         fi
 359
 360         # Check for an error in the bisection process
 361         test $res -ne 0 && exit $res
 362
 363         return 0
 364 }
 365
 366 bisect_visualize() {
 367         bisect_next_check fail
 368
 369         if test $# = 0
 370         then
 371                 if test -n "${DISPLAY+set}${SESSIONNAME+set}${MSYSTEM+set}${SECURITYSESSIONID+set}" &&
 372                         type gitk >/dev/null 2>&1
 373                 then
 374                         set gitk
 375                 else
 376                         set git log
 377                 fi
 378         else
 379                 case "$1" in
 380                 git*|tig) ;;
 381                 -*)     set git log "$@" ;;
 382                 *)      set git "$@" ;;
 383                 esac
 384         fi
 385
 386         eval '"$@"' --bisect -- $(cat "$GIT_DIR/BISECT_NAMES")
 387 }
 388
 389 bisect_reset() {
 390         test -s "$GIT_DIR/BISECT_START" || {
 391                 gettextln "We are not bisecting."
 392                 return
 393         }
 394         case "$#" in
 395         0) branch=$(cat "$GIT_DIR/BISECT_START") ;;
 396         1) git rev-parse --quiet --verify "$1^{commit}" >/dev/null || {
 397                         invalid="$1"
 398                         die "$(eval_gettext "'\$invalid' is not a valid commit")"
 399                 }
 400                 branch="$1" ;;
 401         *)
 402                 usage ;;
 403         esac
 404
 405         if ! test -f "$GIT_DIR/BISECT_HEAD" && ! git checkout "$branch" --
 406         then
 407                 die "$(eval_gettext "Could not check out original HEAD '\$branch'.
 408 Try 'git bisect reset <commit>'.")"
 409         fi
 410         bisect_clean_state
 411 }
 412
 413 bisect_clean_state() {
 414         # There may be some refs packed during bisection.
 415         git for-each-ref --format='%(refname) %(objectname)' refs/bisect/\* |
 416         while read ref hash
 417         do
 418                 git update-ref -d $ref $hash || exit
 419         done
 420         rm -f "$GIT_DIR/BISECT_EXPECTED_REV" &&
 421         rm -f "$GIT_DIR/BISECT_ANCESTORS_OK" &&
 422         rm -f "$GIT_DIR/BISECT_LOG" &&
 423         rm -f "$GIT_DIR/BISECT_NAMES" &&
 424         rm -f "$GIT_DIR/BISECT_RUN" &&
 425         rm -f "$GIT_DIR/BISECT_TERMS" &&
 426         # Cleanup head-name if it got left by an old version of git-bisect
 427         rm -f "$GIT_DIR/head-name" &&
 428         git update-ref -d --no-deref BISECT_HEAD &&
 429         # clean up BISECT_START last
 430         rm -f "$GIT_DIR/BISECT_START"
 431 }
 432
 433 bisect_replay () {
 434         file="$1"
 435         test "$#" -eq 1 || die "$(gettext "No logfile given")"
 436         test -r "$file" || die "$(eval_gettext "cannot read \$file for replaying")"
 437         bisect_reset
 438         while read git bisect command rev
 439         do
 440                 test "$git $bisect" = "git bisect" || test "$git" = "git-bisect" || continue
 441                 if test "$git" = "git-bisect"
 442                 then
 443                         rev="$command"
 444                         command="$bisect"
 445                 fi
 446                 get_terms
 447                 check_and_set_terms "$command"
 448                 case "$command" in
 449                 start)
 450                         cmd="bisect_start $rev"
 451                         eval "$cmd" ;;
 452                 "$TERM_GOOD"|"$TERM_BAD"|skip)
 453                         bisect_write "$command" "$rev" ;;
 454                 *)
 455                         die "$(gettext "?? what are you talking about?")" ;;
 456                 esac
 457         done <"$file"
 458         bisect_auto_next
 459 }
 460
 461 bisect_run () {
 462         bisect_next_check fail
 463
 464         while true
 465         do
 466                 command="$@"
 467                 eval_gettextln "running \$command"
 468                 "$@"
 469                 res=$?
 470
 471                 # Check for really bad run error.
 472                 if [ $res -lt 0 -o $res -ge 128 ]
 473                 then
 474                         eval_gettextln "bisect run failed:
 475 exit code \$res from '\$command' is < 0 or >= 128" >&2
 476                         exit $res
 477                 fi
 478
 479                 # Find current state depending on run success or failure.
 480                 # A special exit code of 125 means cannot test.
 481                 if [ $res -eq 125 ]
 482                 then
 483                         state='skip'
 484                 elif [ $res -gt 0 ]
 485                 then
 486                         state="$TERM_BAD"
 487                 else
 488                         state="$TERM_GOOD"
 489                 fi
 490
 491                 # We have to use a subshell because "bisect_state" can exit.
 492                 ( bisect_state $state >"$GIT_DIR/BISECT_RUN" )
 493                 res=$?
 494
 495                 cat "$GIT_DIR/BISECT_RUN"
 496
 497                 if sane_grep "first $TERM_BAD commit could be any of" "$GIT_DIR/BISECT_RUN" \
 498                         >/dev/null
 499                 then
 500                         gettextln "bisect run cannot continue any more" >&2
 501                         exit $res
 502                 fi
 503
 504                 if [ $res -ne 0 ]
 505                 then
 506                         eval_gettextln "bisect run failed:
 507 'bisect_state \$state' exited with error code \$res" >&2
 508                         exit $res
 509                 fi
 510
 511                 if sane_grep "is the first $TERM_BAD commit" "$GIT_DIR/BISECT_RUN" >/dev/null
 512                 then
 513                         gettextln "bisect run success"
 514                         exit 0;
 515                 fi
 516
 517         done
 518 }
 519
 520 bisect_log () {
 521         test -s "$GIT_DIR/BISECT_LOG" || die "$(gettext "We are not bisecting.")"
 522         cat "$GIT_DIR/BISECT_LOG"
 523 }
 524
 525 get_terms () {
 526         if test -s "$GIT_DIR/BISECT_TERMS"
 527         then
 528                 {
 529                 read TERM_BAD
 530                 read TERM_GOOD
 531                 } <"$GIT_DIR/BISECT_TERMS"
 532         fi
 533 }
 534
 535 write_terms () {
 536         TERM_BAD=$1
 537         TERM_GOOD=$2
 538         printf '%s\n%s\n' "$TERM_BAD" "$TERM_GOOD" >"$GIT_DIR/BISECT_TERMS"
 539 }
 540
 541 check_and_set_terms () {
 542         cmd="$1"
 543         case "$cmd" in
 544         skip|start|terms) ;;
 545         *)
 546                 if test -s "$GIT_DIR/BISECT_TERMS" && test "$cmd" != "$TERM_BAD" && test "$cmd" != "$TERM_GOOD"
 547                 then
 548                         die "$(eval_gettext "Invalid command: you're currently in a \$TERM_BAD/\$TERM_GOOD bisect.")"
 549                 fi
 550                 case "$cmd" in
 551                 bad|good)
 552                         if ! test -s "$GIT_DIR/BISECT_TERMS"
 553                         then
 554                                 write_terms bad good
 555                         fi
 556                         ;;
 557                 esac ;;
 558         esac
 559 }
 560
 561 bisect_voc () {
 562         case "$1" in
 563         bad) echo "bad" ;;
 564         good) echo "good" ;;
 565         esac
 566 }
 567
 568 case "$#" in
 569 0)
 570         usage ;;
 571 *)
 572         cmd="$1"
 573         get_terms
 574         shift
 575         case "$cmd" in
 576         help)
 577                 git bisect -h ;;
 578         start)
 579                 bisect_start "$@" ;;
 580         bad|good|"$TERM_BAD"|"$TERM_GOOD")
 581                 bisect_state "$cmd" "$@" ;;
 582         skip)
 583                 bisect_skip "$@" ;;
 584         next)
 585                 # Not sure we want "next" at the UI level anymore.
 586                 bisect_next "$@" ;;
 587         visualize|view)
 588                 bisect_visualize "$@" ;;
 589         reset)
 590                 bisect_reset "$@" ;;
 591         replay)
 592                 bisect_replay "$@" ;;
 593         log)
 594                 bisect_log ;;
 595         run)
 596                 bisect_run "$@" ;;
 597         *)
 598                 usage ;;
 599         esac
 600 esac