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 [<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>...]
  13         mark <rev>... untestable revisions.
  14 git bisect next
  15         find next bisection to test and check it out.
  16 git bisect reset [<branch>]
  17         finish bisection search and go back to branch.
  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 require_work_tree
  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
  36 sq() {
  37         @@PERL@@ -e '
  38                 for (@ARGV) {
  39                         s/'\''/'\'\\\\\'\''/g;
  40                         print " '\''$_'\''";
  41                 }
  42                 print "\n";
  43         ' "$@"
  44 }
  45
  46 bisect_autostart() {
  47         test -s "$GIT_DIR/BISECT_START" || {
  48                 echo >&2 'You need to start by "git bisect start"'
  49                 if test -t 0
  50                 then
  51                         echo >&2 -n 'Do you want me to do it for you [Y/n]? '
  52                         read yesno
  53                         case "$yesno" in
  54                         [Nn]*)
  55                                 exit ;;
  56                         esac
  57                         bisect_start
  58                 else
  59                         exit 1
  60                 fi
  61         }
  62 }
  63
  64 bisect_start() {
  65         #
  66         # Verify HEAD.
  67         #
  68         head=$(GIT_DIR="$GIT_DIR" git symbolic-ref -q HEAD) ||
  69         head=$(GIT_DIR="$GIT_DIR" git rev-parse --verify HEAD) ||
  70         die "Bad HEAD - I need a HEAD"
  71
  72         #
  73         # Check if we are bisecting.
  74         #
  75         start_head=''
  76         if test -s "$GIT_DIR/BISECT_START"
  77         then
  78                 # Reset to the rev from where we started.
  79                 start_head=$(cat "$GIT_DIR/BISECT_START")
  80                 git checkout "$start_head" || exit
  81         else
  82                 # Get rev from where we start.
  83                 case "$head" in
  84                 refs/heads/*|$_x40)
  85                         # This error message should only be triggered by
  86                         # cogito usage, and cogito users should understand
  87                         # it relates to cg-seek.
  88                         [ -s "$GIT_DIR/head-name" ] &&
  89                                 die "won't bisect on seeked tree"
  90                         start_head="${head#refs/heads/}"
  91                         ;;
  92                 *)
  93                         die "Bad HEAD - strange symbolic ref"
  94                         ;;
  95                 esac
  96         fi
  97
  98         #
  99         # Get rid of any old bisect state.
 100         #
 101         bisect_clean_state || exit
 102
 103         #
 104         # Check for one bad and then some good revisions.
 105         #
 106         has_double_dash=0
 107         for arg; do
 108             case "$arg" in --) has_double_dash=1; break ;; esac
 109         done
 110         orig_args=$(sq "$@")
 111         bad_seen=0
 112         eval=''
 113         while [ $# -gt 0 ]; do
 114             arg="$1"
 115             case "$arg" in
 116             --)
 117                 shift
 118                 break
 119                 ;;
 120             *)
 121                 rev=$(git rev-parse -q --verify "$arg^{commit}") || {
 122                     test $has_double_dash -eq 1 &&
 123                         die "'$arg' does not appear to be a valid revision"
 124                     break
 125                 }
 126                 case $bad_seen in
 127                 0) state='bad' ; bad_seen=1 ;;
 128                 *) state='good' ;;
 129                 esac
 130                 eval="$eval bisect_write '$state' '$rev' 'nolog'; "
 131                 shift
 132                 ;;
 133             esac
 134         done
 135
 136         #
 137         # Change state.
 138         # In case of mistaken revs or checkout error, or signals received,
 139         # "bisect_auto_next" below may exit or misbehave.
 140         # We have to trap this to be able to clean up using
 141         # "bisect_clean_state".
 142         #
 143         trap 'bisect_clean_state' 0
 144         trap 'exit 255' 1 2 3 15
 145
 146         #
 147         # Write new start state.
 148         #
 149         echo "$start_head" >"$GIT_DIR/BISECT_START" &&
 150         sq "$@" >"$GIT_DIR/BISECT_NAMES" &&
 151         eval "$eval" &&
 152         echo "git-bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG" || exit
 153         #
 154         # Check if we can proceed to the next bisect state.
 155         #
 156         bisect_auto_next
 157
 158         trap '-' 0
 159 }
 160
 161 bisect_write() {
 162         state="$1"
 163         rev="$2"
 164         nolog="$3"
 165         case "$state" in
 166                 bad)            tag="$state" ;;
 167                 good|skip)      tag="$state"-"$rev" ;;
 168                 *)              die "Bad bisect_write argument: $state" ;;
 169         esac
 170         git update-ref "refs/bisect/$tag" "$rev" || exit
 171         echo "# $state: $(git show-branch $rev)" >>"$GIT_DIR/BISECT_LOG"
 172         test -n "$nolog" || echo "git-bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
 173 }
 174
 175 bisect_state() {
 176         bisect_autostart
 177         state=$1
 178         case "$#,$state" in
 179         0,*)
 180                 die "Please call 'bisect_state' with at least one argument." ;;
 181         1,bad|1,good|1,skip)
 182                 rev=$(git rev-parse --verify HEAD) ||
 183                         die "Bad rev input: HEAD"
 184                 bisect_write "$state" "$rev" ;;
 185         2,bad|*,good|*,skip)
 186                 shift
 187                 eval=''
 188                 for rev in "$@"
 189                 do
 190                         sha=$(git rev-parse --verify "$rev^{commit}") ||
 191                                 die "Bad rev input: $rev"
 192                         eval="$eval bisect_write '$state' '$sha'; "
 193                 done
 194                 eval "$eval" ;;
 195         *,bad)
 196                 die "'git bisect bad' can take only one argument." ;;
 197         *)
 198                 usage ;;
 199         esac
 200         bisect_auto_next
 201 }
 202
 203 bisect_next_check() {
 204         missing_good= missing_bad=
 205         git show-ref -q --verify refs/bisect/bad || missing_bad=t
 206         test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
 207
 208         case "$missing_good,$missing_bad,$1" in
 209         ,,*)
 210                 : have both good and bad - ok
 211                 ;;
 212         *,)
 213                 # do not have both but not asked to fail - just report.
 214                 false
 215                 ;;
 216         t,,good)
 217                 # have bad but not good.  we could bisect although
 218                 # this is less optimum.
 219                 echo >&2 'Warning: bisecting only with a bad commit.'
 220                 if test -t 0
 221                 then
 222                         printf >&2 'Are you sure [Y/n]? '
 223                         case "$(read yesno)" in [Nn]*) exit 1 ;; esac
 224                 fi
 225                 : bisect without good...
 226                 ;;
 227         *)
 228                 THEN=''
 229                 test -s "$GIT_DIR/BISECT_START" || {
 230                         echo >&2 'You need to start by "git bisect start".'
 231                         THEN='then '
 232                 }
 233                 echo >&2 'You '$THEN'need to give me at least one good' \
 234                         'and one bad revisions.'
 235                 echo >&2 '(You can use "git bisect bad" and' \
 236                         '"git bisect good" for that.)'
 237                 exit 1 ;;
 238         esac
 239 }
 240
 241 bisect_auto_next() {
 242         bisect_next_check && bisect_next || :
 243 }
 244
 245 eval_rev_list() {
 246         _eval="$1"
 247
 248         eval $_eval
 249         res=$?
 250
 251         if [ $res -ne 0 ]; then
 252                 echo >&2 "'git rev-list --bisect-vars' failed:"
 253                 echo >&2 "maybe you mistake good and bad revs?"
 254                 exit $res
 255         fi
 256
 257         return $res
 258 }
 259
 260 filter_skipped() {
 261         _eval="$1"
 262         _skip="$2"
 263
 264         if [ -z "$_skip" ]; then
 265                 eval_rev_list "$_eval"
 266                 return
 267         fi
 268
 269         # Let's parse the output of:
 270         # "git rev-list --bisect-vars --bisect-all ..."
 271         eval_rev_list "$_eval" | while read hash line
 272         do
 273                 case "$VARS,$FOUND,$TRIED,$hash" in
 274                         # We display some vars.
 275                         1,*,*,*) echo "$hash $line" ;;
 276
 277                         # Split line.
 278                         ,*,*,---*) ;;
 279
 280                         # We had nothing to search.
 281                         ,,,bisect_rev*)
 282                                 echo "bisect_rev="
 283                                 VARS=1
 284                                 ;;
 285
 286                         # We did not find a good bisect rev.
 287                         # This should happen only if the "bad"
 288                         # commit is also a "skip" commit.
 289                         ,,*,bisect_rev*)
 290                                 echo "bisect_rev=$TRIED"
 291                                 VARS=1
 292                                 ;;
 293
 294                         # We are searching.
 295                         ,,*,*)
 296                                 TRIED="${TRIED:+$TRIED|}$hash"
 297                                 case "$_skip" in
 298                                 *$hash*) ;;
 299                                 *)
 300                                         echo "bisect_rev=$hash"
 301                                         echo "bisect_tried=\"$TRIED\""
 302                                         FOUND=1
 303                                         ;;
 304                                 esac
 305                                 ;;
 306
 307                         # We have already found a rev to be tested.
 308                         ,1,*,bisect_rev*) VARS=1 ;;
 309                         ,1,*,*) ;;
 310
 311                         # ???
 312                         *) die "filter_skipped error " \
 313                             "VARS: '$VARS' " \
 314                             "FOUND: '$FOUND' " \
 315                             "TRIED: '$TRIED' " \
 316                             "hash: '$hash' " \
 317                             "line: '$line'"
 318                         ;;
 319                 esac
 320         done
 321 }
 322
 323 exit_if_skipped_commits () {
 324         _tried=$1
 325         if expr "$_tried" : ".*[|].*" > /dev/null ; then
 326                 echo "There are only 'skip'ped commit left to test."
 327                 echo "The first bad commit could be any of:"
 328                 echo "$_tried" | tr '[|]' '[\012]'
 329                 echo "We cannot bisect more!"
 330                 exit 2
 331         fi
 332 }
 333
 334 bisect_next() {
 335         case "$#" in 0) ;; *) usage ;; esac
 336         bisect_autostart
 337         bisect_next_check good
 338
 339         skip=$(git for-each-ref --format='%(objectname)' \
 340                 "refs/bisect/skip-*" | tr '\012' ' ') || exit
 341
 342         BISECT_OPT=''
 343         test -n "$skip" && BISECT_OPT='--bisect-all'
 344
 345         bad=$(git rev-parse --verify refs/bisect/bad) &&
 346         good=$(git for-each-ref --format='^%(objectname)' \
 347                 "refs/bisect/good-*" | tr '\012' ' ') &&
 348         eval="git rev-list --bisect-vars $BISECT_OPT $good $bad --" &&
 349         eval="$eval $(cat "$GIT_DIR/BISECT_NAMES")" &&
 350         eval=$(filter_skipped "$eval" "$skip") &&
 351         eval "$eval" || exit
 352
 353         if [ -z "$bisect_rev" ]; then
 354                 echo "$bad was both good and bad"
 355                 exit 1
 356         fi
 357         if [ "$bisect_rev" = "$bad" ]; then
 358                 exit_if_skipped_commits "$bisect_tried"
 359                 echo "$bisect_rev is first bad commit"
 360                 git diff-tree --pretty $bisect_rev
 361                 exit 0
 362         fi
 363
 364         # We should exit here only if the "bad"
 365         # commit is also a "skip" commit (see above).
 366         exit_if_skipped_commits "$bisect_rev"
 367
 368         echo "Bisecting: $bisect_nr revisions left to test after this"
 369         git checkout -q "$bisect_rev" || exit
 370         git show-branch "$bisect_rev"
 371 }
 372
 373 bisect_visualize() {
 374         bisect_next_check fail
 375
 376         if test $# = 0
 377         then
 378                 case "${DISPLAY+set}${MSYSTEM+set}${SECURITYSESSIONID+set}" in
 379                 '')     set git log ;;
 380                 set*)   set gitk ;;
 381                 esac
 382         else
 383                 case "$1" in
 384                 git*|tig) ;;
 385                 -*)     set git log "$@" ;;
 386                 *)      set git "$@" ;;
 387                 esac
 388         fi
 389
 390         not=$(git for-each-ref --format='%(refname)' "refs/bisect/good-*")
 391         eval '"$@"' refs/bisect/bad --not $not -- $(cat "$GIT_DIR/BISECT_NAMES")
 392 }
 393
 394 bisect_reset() {
 395         test -s "$GIT_DIR/BISECT_START" || {
 396                 echo "We are not bisecting."
 397                 return
 398         }
 399         case "$#" in
 400         0) branch=$(cat "$GIT_DIR/BISECT_START") ;;
 401         1) git show-ref --verify --quiet -- "refs/heads/$1" ||
 402                die "$1 does not seem to be a valid branch"
 403            branch="$1" ;;
 404         *)
 405             usage ;;
 406         esac
 407         git checkout "$branch" && bisect_clean_state
 408 }
 409
 410 bisect_clean_state() {
 411         # There may be some refs packed during bisection.
 412         git for-each-ref --format='%(refname) %(objectname)' refs/bisect/\* |
 413         while read ref hash
 414         do
 415                 git update-ref -d $ref $hash || exit
 416         done
 417         rm -f "$GIT_DIR/BISECT_LOG" &&
 418         rm -f "$GIT_DIR/BISECT_NAMES" &&
 419         rm -f "$GIT_DIR/BISECT_RUN" &&
 420         # Cleanup head-name if it got left by an old version of git-bisect
 421         rm -f "$GIT_DIR/head-name" &&
 422
 423         rm -f "$GIT_DIR/BISECT_START"
 424 }
 425
 426 bisect_replay () {
 427         test -r "$1" || die "cannot read $1 for replaying"
 428         bisect_reset
 429         while read bisect command rev
 430         do
 431                 test "$bisect" = "git-bisect" || continue
 432                 case "$command" in
 433                 start)
 434                         cmd="bisect_start $rev"
 435                         eval "$cmd" ;;
 436                 good|bad|skip)
 437                         bisect_write "$command" "$rev" ;;
 438                 *)
 439                         die "?? what are you talking about?" ;;
 440                 esac
 441         done <"$1"
 442         bisect_auto_next
 443 }
 444
 445 bisect_run () {
 446     bisect_next_check fail
 447
 448     while true
 449     do
 450       echo "running $@"
 451       "$@"
 452       res=$?
 453
 454       # Check for really bad run error.
 455       if [ $res -lt 0 -o $res -ge 128 ]; then
 456           echo >&2 "bisect run failed:"
 457           echo >&2 "exit code $res from '$@' is < 0 or >= 128"
 458           exit $res
 459       fi
 460
 461       # Find current state depending on run success or failure.
 462       # A special exit code of 125 means cannot test.
 463       if [ $res -eq 125 ]; then
 464           state='skip'
 465       elif [ $res -gt 0 ]; then
 466           state='bad'
 467       else
 468           state='good'
 469       fi
 470
 471       # We have to use a subshell because "bisect_state" can exit.
 472       ( bisect_state $state > "$GIT_DIR/BISECT_RUN" )
 473       res=$?
 474
 475       cat "$GIT_DIR/BISECT_RUN"
 476
 477       if grep "first bad commit could be any of" "$GIT_DIR/BISECT_RUN" \
 478                 > /dev/null; then
 479           echo >&2 "bisect run cannot continue any more"
 480           exit $res
 481       fi
 482
 483       if [ $res -ne 0 ]; then
 484           echo >&2 "bisect run failed:"
 485           echo >&2 "'bisect_state $state' exited with error code $res"
 486           exit $res
 487       fi
 488
 489       if grep "is first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
 490           echo "bisect run success"
 491           exit 0;
 492       fi
 493
 494     done
 495 }
 496
 497
 498 case "$#" in
 499 0)
 500     usage ;;
 501 *)
 502     cmd="$1"
 503     shift
 504     case "$cmd" in
 505     help)
 506         git bisect -h ;;
 507     start)
 508         bisect_start "$@" ;;
 509     bad|good|skip)
 510         bisect_state "$cmd" "$@" ;;
 511     next)
 512         # Not sure we want "next" at the UI level anymore.
 513         bisect_next "$@" ;;
 514     visualize|view)
 515         bisect_visualize "$@" ;;
 516     reset)
 517         bisect_reset "$@" ;;
 518     replay)
 519         bisect_replay "$@" ;;
 520     log)
 521         cat "$GIT_DIR/BISECT_LOG" ;;
 522     run)
 523         bisect_run "$@" ;;
 524     *)
 525         usage ;;
 526     esac
 527 esac