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>|<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 require_work_tree
  33
  34 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
  35 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
  36
  37 bisect_autostart() {
  38         test -s "$GIT_DIR/BISECT_START" || {
  39                 (
  40                         gettext "You need to start by \"git bisect start\"" &&
  41                         echo
  42                 ) >&2
  43                 if test -t 0
  44                 then
  45                         echo >&2 -n 'Do you want me to do it for you [Y/n]? '
  46                         read yesno
  47                         case "$yesno" in
  48                         [Nn]*)
  49                                 exit ;;
  50                         esac
  51                         bisect_start
  52                 else
  53                         exit 1
  54                 fi
  55         }
  56 }
  57
  58 bisect_start() {
  59         #
  60         # Verify HEAD.
  61         #
  62         head=$(GIT_DIR="$GIT_DIR" git symbolic-ref -q HEAD) ||
  63         head=$(GIT_DIR="$GIT_DIR" git rev-parse --verify HEAD) ||
  64         die "Bad HEAD - I need a HEAD"
  65
  66         #
  67         # Check if we are bisecting.
  68         #
  69         start_head=''
  70         if test -s "$GIT_DIR/BISECT_START"
  71         then
  72                 # Reset to the rev from where we started.
  73                 start_head=$(cat "$GIT_DIR/BISECT_START")
  74                 git checkout "$start_head" -- || exit
  75         else
  76                 # Get rev from where we start.
  77                 case "$head" in
  78                 refs/heads/*|$_x40)
  79                         # This error message should only be triggered by
  80                         # cogito usage, and cogito users should understand
  81                         # it relates to cg-seek.
  82                         [ -s "$GIT_DIR/head-name" ] &&
  83                                 die "won't bisect on seeked tree"
  84                         start_head="${head#refs/heads/}"
  85                         ;;
  86                 *)
  87                         die "Bad HEAD - strange symbolic ref"
  88                         ;;
  89                 esac
  90         fi
  91
  92         #
  93         # Get rid of any old bisect state.
  94         #
  95         bisect_clean_state || exit
  96
  97         #
  98         # Check for one bad and then some good revisions.
  99         #
 100         has_double_dash=0
 101         for arg; do
 102             case "$arg" in --) has_double_dash=1; break ;; esac
 103         done
 104         orig_args=$(git rev-parse --sq-quote "$@")
 105         bad_seen=0
 106         eval=''
 107         while [ $# -gt 0 ]; do
 108             arg="$1"
 109             case "$arg" in
 110             --)
 111                 shift
 112                 break
 113                 ;;
 114             *)
 115                 rev=$(git rev-parse -q --verify "$arg^{commit}") || {
 116                     test $has_double_dash -eq 1 &&
 117                         die "'$arg' does not appear to be a valid revision"
 118                     break
 119                 }
 120                 case $bad_seen in
 121                 0) state='bad' ; bad_seen=1 ;;
 122                 *) state='good' ;;
 123                 esac
 124                 eval="$eval bisect_write '$state' '$rev' 'nolog'; "
 125                 shift
 126                 ;;
 127             esac
 128         done
 129
 130         #
 131         # Change state.
 132         # In case of mistaken revs or checkout error, or signals received,
 133         # "bisect_auto_next" below may exit or misbehave.
 134         # We have to trap this to be able to clean up using
 135         # "bisect_clean_state".
 136         #
 137         trap 'bisect_clean_state' 0
 138         trap 'exit 255' 1 2 3 15
 139
 140         #
 141         # Write new start state.
 142         #
 143         echo "$start_head" >"$GIT_DIR/BISECT_START" &&
 144         git rev-parse --sq-quote "$@" >"$GIT_DIR/BISECT_NAMES" &&
 145         eval "$eval" &&
 146         echo "git bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG" || exit
 147         #
 148         # Check if we can proceed to the next bisect state.
 149         #
 150         bisect_auto_next
 151
 152         trap '-' 0
 153 }
 154
 155 bisect_write() {
 156         state="$1"
 157         rev="$2"
 158         nolog="$3"
 159         case "$state" in
 160                 bad)            tag="$state" ;;
 161                 good|skip)      tag="$state"-"$rev" ;;
 162                 *)              die "Bad bisect_write argument: $state" ;;
 163         esac
 164         git update-ref "refs/bisect/$tag" "$rev" || exit
 165         echo "# $state: $(git show-branch $rev)" >>"$GIT_DIR/BISECT_LOG"
 166         test -n "$nolog" || echo "git bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
 167 }
 168
 169 is_expected_rev() {
 170         test -f "$GIT_DIR/BISECT_EXPECTED_REV" &&
 171         test "$1" = $(cat "$GIT_DIR/BISECT_EXPECTED_REV")
 172 }
 173
 174 check_expected_revs() {
 175         for _rev in "$@"; do
 176                 if ! is_expected_rev "$_rev"; then
 177                         rm -f "$GIT_DIR/BISECT_ANCESTORS_OK"
 178                         rm -f "$GIT_DIR/BISECT_EXPECTED_REV"
 179                         return
 180                 fi
 181         done
 182 }
 183
 184 bisect_skip() {
 185         all=''
 186         for arg in "$@"
 187         do
 188             case "$arg" in
 189             *..*)
 190                 revs=$(git rev-list "$arg") || die "Bad rev input: $arg" ;;
 191             *)
 192                 revs=$(git rev-parse --sq-quote "$arg") ;;
 193             esac
 194             all="$all $revs"
 195         done
 196         eval bisect_state 'skip' $all
 197 }
 198
 199 bisect_state() {
 200         bisect_autostart
 201         state=$1
 202         case "$#,$state" in
 203         0,*)
 204                 die "Please call 'bisect_state' with at least one argument." ;;
 205         1,bad|1,good|1,skip)
 206                 rev=$(git rev-parse --verify HEAD) ||
 207                         die "Bad rev input: HEAD"
 208                 bisect_write "$state" "$rev"
 209                 check_expected_revs "$rev" ;;
 210         2,bad|*,good|*,skip)
 211                 shift
 212                 eval=''
 213                 for rev in "$@"
 214                 do
 215                         sha=$(git rev-parse --verify "$rev^{commit}") ||
 216                                 die "Bad rev input: $rev"
 217                         eval="$eval bisect_write '$state' '$sha'; "
 218                 done
 219                 eval "$eval"
 220                 check_expected_revs "$@" ;;
 221         *,bad)
 222                 die "'git bisect bad' can take only one argument." ;;
 223         *)
 224                 usage ;;
 225         esac
 226         bisect_auto_next
 227 }
 228
 229 bisect_next_check() {
 230         missing_good= missing_bad=
 231         git show-ref -q --verify refs/bisect/bad || missing_bad=t
 232         test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
 233
 234         case "$missing_good,$missing_bad,$1" in
 235         ,,*)
 236                 : have both good and bad - ok
 237                 ;;
 238         *,)
 239                 # do not have both but not asked to fail - just report.
 240                 false
 241                 ;;
 242         t,,good)
 243                 # have bad but not good.  we could bisect although
 244                 # this is less optimum.
 245                 (
 246                         gettext "Warning: bisecting only with a bad commit." &&
 247                         echo
 248                 ) >&2
 249                 if test -t 0
 250                 then
 251                         printf >&2 'Are you sure [Y/n]? '
 252                         read yesno
 253                         case "$yesno" in [Nn]*) exit 1 ;; esac
 254                 fi
 255                 : bisect without good...
 256                 ;;
 257         *)
 258                 THEN=''
 259                 test -s "$GIT_DIR/BISECT_START" || {
 260                         echo >&2 'You need to start by "git bisect start".'
 261                         THEN='then '
 262                 }
 263                 echo >&2 'You '$THEN'need to give me at least one good' \
 264                         'and one bad revisions.'
 265                 echo >&2 '(You can use "git bisect bad" and' \
 266                         '"git bisect good" for that.)'
 267                 exit 1 ;;
 268         esac
 269 }
 270
 271 bisect_auto_next() {
 272         bisect_next_check && bisect_next || :
 273 }
 274
 275 bisect_next() {
 276         case "$#" in 0) ;; *) usage ;; esac
 277         bisect_autostart
 278         bisect_next_check good
 279
 280         # Perform all bisection computation, display and checkout
 281         git bisect--helper --next-all
 282         res=$?
 283
 284         # Check if we should exit because bisection is finished
 285         test $res -eq 10 && exit 0
 286
 287         # Check for an error in the bisection process
 288         test $res -ne 0 && exit $res
 289
 290         return 0
 291 }
 292
 293 bisect_visualize() {
 294         bisect_next_check fail
 295
 296         if test $# = 0
 297         then
 298                 if test -n "${DISPLAY+set}${SESSIONNAME+set}${MSYSTEM+set}${SECURITYSESSIONID+set}" &&
 299                    type gitk >/dev/null 2>&1; then
 300                         set gitk
 301                 else
 302                         set git log
 303                 fi
 304         else
 305                 case "$1" in
 306                 git*|tig) ;;
 307                 -*)     set git log "$@" ;;
 308                 *)      set git "$@" ;;
 309                 esac
 310         fi
 311
 312         eval '"$@"' --bisect -- $(cat "$GIT_DIR/BISECT_NAMES")
 313 }
 314
 315 bisect_reset() {
 316         test -s "$GIT_DIR/BISECT_START" || {
 317                 gettext "We are not bisecting."; echo
 318                 return
 319         }
 320         case "$#" in
 321         0) branch=$(cat "$GIT_DIR/BISECT_START") ;;
 322         1) git rev-parse --quiet --verify "$1^{commit}" > /dev/null ||
 323                die "'$1' is not a valid commit"
 324            branch="$1" ;;
 325         *)
 326             usage ;;
 327         esac
 328         if git checkout "$branch" -- ; then
 329                 bisect_clean_state
 330         else
 331                 die "Could not check out original HEAD '$branch'." \
 332                                 "Try 'git bisect reset <commit>'."
 333         fi
 334 }
 335
 336 bisect_clean_state() {
 337         # There may be some refs packed during bisection.
 338         git for-each-ref --format='%(refname) %(objectname)' refs/bisect/\* |
 339         while read ref hash
 340         do
 341                 git update-ref -d $ref $hash || exit
 342         done
 343         rm -f "$GIT_DIR/BISECT_EXPECTED_REV" &&
 344         rm -f "$GIT_DIR/BISECT_ANCESTORS_OK" &&
 345         rm -f "$GIT_DIR/BISECT_LOG" &&
 346         rm -f "$GIT_DIR/BISECT_NAMES" &&
 347         rm -f "$GIT_DIR/BISECT_RUN" &&
 348         # Cleanup head-name if it got left by an old version of git-bisect
 349         rm -f "$GIT_DIR/head-name" &&
 350
 351         rm -f "$GIT_DIR/BISECT_START"
 352 }
 353
 354 bisect_replay () {
 355         test "$#" -eq 1 || die "No logfile given"
 356         test -r "$1" || die "cannot read $1 for replaying"
 357         bisect_reset
 358         while read git bisect command rev
 359         do
 360                 test "$git $bisect" = "git bisect" -o "$git" = "git-bisect" || continue
 361                 if test "$git" = "git-bisect"; then
 362                         rev="$command"
 363                         command="$bisect"
 364                 fi
 365                 case "$command" in
 366                 start)
 367                         cmd="bisect_start $rev"
 368                         eval "$cmd" ;;
 369                 good|bad|skip)
 370                         bisect_write "$command" "$rev" ;;
 371                 *)
 372                         die "?? what are you talking about?" ;;
 373                 esac
 374         done <"$1"
 375         bisect_auto_next
 376 }
 377
 378 bisect_run () {
 379     bisect_next_check fail
 380
 381     while true
 382     do
 383       echo "running $@"
 384       "$@"
 385       res=$?
 386
 387       # Check for really bad run error.
 388       if [ $res -lt 0 -o $res -ge 128 ]; then
 389           echo >&2 "bisect run failed:"
 390           echo >&2 "exit code $res from '$@' is < 0 or >= 128"
 391           exit $res
 392       fi
 393
 394       # Find current state depending on run success or failure.
 395       # A special exit code of 125 means cannot test.
 396       if [ $res -eq 125 ]; then
 397           state='skip'
 398       elif [ $res -gt 0 ]; then
 399           state='bad'
 400       else
 401           state='good'
 402       fi
 403
 404       # We have to use a subshell because "bisect_state" can exit.
 405       ( bisect_state $state > "$GIT_DIR/BISECT_RUN" )
 406       res=$?
 407
 408       cat "$GIT_DIR/BISECT_RUN"
 409
 410       if sane_grep "first bad commit could be any of" "$GIT_DIR/BISECT_RUN" \
 411                 > /dev/null; then
 412           (
 413               gettext "bisect run cannot continue any more" &&
 414               echo
 415           ) >&2
 416           exit $res
 417       fi
 418
 419       if [ $res -ne 0 ]; then
 420           (
 421               eval_gettext "bisect run failed:
 422 'bisect_state \$state' exited with error code \$res" &&
 423               echo
 424           ) >&2
 425           exit $res
 426       fi
 427
 428       if sane_grep "is the first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
 429           gettext "bisect run success"; echo
 430           exit 0;
 431       fi
 432
 433     done
 434 }
 435
 436 bisect_log () {
 437         test -s "$GIT_DIR/BISECT_LOG" || die "We are not bisecting."
 438         cat "$GIT_DIR/BISECT_LOG"
 439 }
 440
 441 case "$#" in
 442 0)
 443     usage ;;
 444 *)
 445     cmd="$1"
 446     shift
 447     case "$cmd" in
 448     help)
 449         git bisect -h ;;
 450     start)
 451         bisect_start "$@" ;;
 452     bad|good)
 453         bisect_state "$cmd" "$@" ;;
 454     skip)
 455         bisect_skip "$@" ;;
 456     next)
 457         # Not sure we want "next" at the UI level anymore.
 458         bisect_next "$@" ;;
 459     visualize|view)
 460         bisect_visualize "$@" ;;
 461     reset)
 462         bisect_reset "$@" ;;
 463     replay)
 464         bisect_replay "$@" ;;
 465     log)
 466         bisect_log ;;
 467     run)
 468         bisect_run "$@" ;;
 469     *)
 470         usage ;;
 471     esac
 472 esac