git-bisect.sh

   1 #!/bin/sh
   2
   3 USAGE='[start|bad|good|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 next
  11         find next bisection to test and check it out.
  12 git bisect reset [<branch>]
  13         finish bisection search and go back to branch.
  14 git bisect visualize
  15         show bisect status in gitk.
  16 git bisect replay <logfile>
  17         replay bisection log.
  18 git bisect log
  19         show bisect log.
  20 git bisect skip [<rev>...]
  21         mark <rev>... untestable revisions.
  22 git bisect run <cmd>...
  23         use <cmd>... to automatically bisect.'
  24
  25 . git-sh-setup
  26 require_work_tree
  27
  28 sq() {
  29         @@PERL@@ -e '
  30                 for (@ARGV) {
  31                         s/'\''/'\'\\\\\'\''/g;
  32                         print " '\''$_'\''";
  33                 }
  34                 print "\n";
  35         ' "$@"
  36 }
  37
  38 bisect_autostart() {
  39         test -d "$GIT_DIR/refs/bisect" || {
  40                 echo >&2 'You need to start by "git bisect start"'
  41                 if test -t 0
  42                 then
  43                         echo >&2 -n 'Do you want me to do it for you [Y/n]? '
  44                         read yesno
  45                         case "$yesno" in
  46                         [Nn]*)
  47                                 exit ;;
  48                         esac
  49                         bisect_start
  50                 else
  51                         exit 1
  52                 fi
  53         }
  54 }
  55
  56 bisect_start() {
  57         #
  58         # Verify HEAD. If we were bisecting before this, reset to the
  59         # top-of-line master first!
  60         #
  61         head=$(GIT_DIR="$GIT_DIR" git symbolic-ref HEAD) ||
  62         die "Bad HEAD - I need a symbolic ref"
  63         case "$head" in
  64         refs/heads/bisect)
  65                 if [ -s "$GIT_DIR/head-name" ]; then
  66                     branch=`cat "$GIT_DIR/head-name"`
  67                 else
  68                     branch=master
  69                 fi
  70                 git checkout $branch || exit
  71                 ;;
  72         refs/heads/*)
  73                 [ -s "$GIT_DIR/head-name" ] && die "won't bisect on seeked tree"
  74                 echo "$head" | sed 's#^refs/heads/##' >"$GIT_DIR/head-name"
  75                 ;;
  76         *)
  77                 die "Bad HEAD - strange symbolic ref"
  78                 ;;
  79         esac
  80
  81         #
  82         # Get rid of any old bisect state
  83         #
  84         bisect_clean_state
  85         mkdir "$GIT_DIR/refs/bisect"
  86
  87         #
  88         # Check for one bad and then some good revisions.
  89         #
  90         has_double_dash=0
  91         for arg; do
  92             case "$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
 102                 ;;
 103             *)
 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
 108                 }
 109                 case $bad_seen in
 110                 0) state='bad' ; bad_seen=1 ;;
 111                 *) state='good' ;;
 112                 esac
 113                 bisect_write "$state" "$rev" 'nolog'
 114                 shift
 115                 ;;
 116             esac
 117         done
 118
 119         sq "$@" >"$GIT_DIR/BISECT_NAMES"
 120         echo "git-bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG"
 121         bisect_auto_next
 122 }
 123
 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: $state" ;;
 132         esac
 133         echo "$rev" >"$GIT_DIR/refs/bisect/$tag"
 134         echo "# $state: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
 135         test -z "$nolog" && echo "git-bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
 136 }
 137
 138 bisect_bad() {
 139         bisect_autostart
 140         case "$#" in
 141         0)
 142                 rev=$(git rev-parse --verify HEAD) ;;
 143         1)
 144                 rev=$(git rev-parse --verify "$1^{commit}") ;;
 145         *)
 146                 usage ;;
 147         esac || exit
 148         bisect_write 'bad' "$rev"
 149         bisect_auto_next
 150 }
 151
 152 bisect_good() {
 153         bisect_autostart
 154         case "$#" in
 155         0)    revs=$(git rev-parse --verify HEAD) || exit ;;
 156         *)    revs=$(git rev-parse --revs-only --no-flags "$@") &&
 157                 test '' != "$revs" || die "Bad rev input: $@" ;;
 158         esac
 159         for rev in $revs
 160         do
 161                 rev=$(git rev-parse --verify "$rev^{commit}") || exit
 162                 bisect_write 'good' "$rev"
 163         done
 164         bisect_auto_next
 165 }
 166
 167 bisect_skip() {
 168         bisect_autostart
 169         case "$#" in
 170         0)    revs=$(git rev-parse --verify HEAD) || exit ;;
 171         *)    revs=$(git rev-parse --revs-only --no-flags "$@") &&
 172                 test '' != "$revs" || die "Bad rev input: $@" ;;
 173         esac
 174         for rev in $revs
 175         do
 176                 rev=$(git rev-parse --verify "$rev^{commit}") || exit
 177                 bisect_write 'skip' "$rev"
 178         done
 179         bisect_auto_next
 180 }
 181
 182 bisect_next_check() {
 183         missing_good= missing_bad=
 184         git show-ref -q --verify refs/bisect/bad || missing_bad=t
 185         test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
 186
 187         case "$missing_good,$missing_bad,$1" in
 188         ,,*)
 189                 : have both good and bad - ok
 190                 ;;
 191         *,)
 192                 # do not have both but not asked to fail - just report.
 193                 false
 194                 ;;
 195         t,,good)
 196                 # have bad but not good.  we could bisect although
 197                 # this is less optimum.
 198                 echo >&2 'Warning: bisecting only with a bad commit.'
 199                 if test -t 0
 200                 then
 201                         printf >&2 'Are you sure [Y/n]? '
 202                         case "$(read yesno)" in [Nn]*) exit 1 ;; esac
 203                 fi
 204                 : bisect without good...
 205                 ;;
 206         *)
 207                 THEN=''
 208                 test -d "$GIT_DIR/refs/bisect" || {
 209                         echo >&2 'You need to start by "git bisect start".'
 210                         THEN='then '
 211                 }
 212                 echo >&2 'You '$THEN'need to give me at least one good' \
 213                         'and one bad revisions.'
 214                 echo >&2 '(You can use "git bisect bad" and' \
 215                         '"git bisect good" for that.)'
 216                 exit 1 ;;
 217         esac
 218 }
 219
 220 bisect_auto_next() {
 221         bisect_next_check && bisect_next || :
 222 }
 223
 224 filter_skipped() {
 225         _eval="$1"
 226         _skip="$2"
 227
 228         if [ -z "$_skip" ]; then
 229                 eval $_eval
 230                 return
 231         fi
 232
 233         # Let's parse the output of:
 234         # "git rev-list --bisect-vars --bisect-all ..."
 235         eval $_eval | while read hash line
 236         do
 237                 case "$VARS,$FOUND,$TRIED,$hash" in
 238                         # We display some vars.
 239                         1,*,*,*) echo "$hash $line" ;;
 240
 241                         # Split line.
 242                         ,*,*,---*) ;;
 243
 244                         # We had nothing to search.
 245                         ,,,bisect_rev*)
 246                                 echo "bisect_rev="
 247                                 VARS=1
 248                                 ;;
 249
 250                         # We did not find a good bisect rev.
 251                         # This should happen only if the "bad"
 252                         # commit is also a "skip" commit.
 253                         ,,*,bisect_rev*)
 254                                 echo "bisect_rev=$TRIED"
 255                                 VARS=1
 256                                 ;;
 257
 258                         # We are searching.
 259                         ,,*,*)
 260                                 TRIED="${TRIED:+$TRIED|}$hash"
 261                                 case "$_skip" in
 262                                 *$hash*) ;;
 263                                 *)
 264                                         echo "bisect_rev=$hash"
 265                                         echo "bisect_tried=\"$TRIED\""
 266                                         FOUND=1
 267                                         ;;
 268                                 esac
 269                                 ;;
 270
 271                         # We have already found a rev to be tested.
 272                         ,1,*,bisect_rev*) VARS=1 ;;
 273                         ,1,*,*) ;;
 274
 275                         # ???
 276                         *) die "filter_skipped error " \
 277                             "VARS: '$VARS' " \
 278                             "FOUND: '$FOUND' " \
 279                             "TRIED: '$TRIED' " \
 280                             "hash: '$hash' " \
 281                             "line: '$line'"
 282                         ;;
 283                 esac
 284         done
 285 }
 286
 287 exit_if_skipped_commits () {
 288         _tried=$1
 289         if expr "$_tried" : ".*[|].*" > /dev/null ; then
 290                 echo "There are only 'skip'ped commit left to test."
 291                 echo "The first bad commit could be any of:"
 292                 echo "$_tried" | sed -e 's/[|]/\n/g'
 293                 echo "We cannot bisect more!"
 294                 exit 2
 295         fi
 296 }
 297
 298 bisect_next() {
 299         case "$#" in 0) ;; *) usage ;; esac
 300         bisect_autostart
 301         bisect_next_check good
 302
 303         skip=$(git for-each-ref --format='%(objectname)' \
 304                 "refs/bisect/skip-*" | tr '[\012]' ' ') || exit
 305
 306         BISECT_OPT=''
 307         test -n "$skip" && BISECT_OPT='--bisect-all'
 308
 309         bad=$(git rev-parse --verify refs/bisect/bad) &&
 310         good=$(git for-each-ref --format='^%(objectname)' \
 311                 "refs/bisect/good-*" | tr '[\012]' ' ') &&
 312         eval="git rev-list --bisect-vars $BISECT_OPT $good $bad --" &&
 313         eval="$eval $(cat "$GIT_DIR/BISECT_NAMES")" &&
 314         eval=$(filter_skipped "$eval" "$skip") &&
 315         eval "$eval" || exit
 316
 317         if [ -z "$bisect_rev" ]; then
 318                 echo "$bad was both good and bad"
 319                 exit 1
 320         fi
 321         if [ "$bisect_rev" = "$bad" ]; then
 322                 exit_if_skipped_commits "$bisect_tried"
 323                 echo "$bisect_rev is first bad commit"
 324                 git diff-tree --pretty $bisect_rev
 325                 exit 0
 326         fi
 327
 328         # We should exit here only if the "bad"
 329         # commit is also a "skip" commit (see above).
 330         exit_if_skipped_commits "$bisect_rev"
 331
 332         echo "Bisecting: $bisect_nr revisions left to test after this"
 333         echo "$bisect_rev" >"$GIT_DIR/refs/heads/new-bisect"
 334         git checkout -q new-bisect || exit
 335         mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
 336         GIT_DIR="$GIT_DIR" git symbolic-ref HEAD refs/heads/bisect
 337         git show-branch "$bisect_rev"
 338 }
 339
 340 bisect_visualize() {
 341         bisect_next_check fail
 342         not=`cd "$GIT_DIR/refs" && echo bisect/good-*`
 343         eval gitk bisect/bad --not $not -- $(cat "$GIT_DIR/BISECT_NAMES")
 344 }
 345
 346 bisect_reset() {
 347         case "$#" in
 348         0) if [ -s "$GIT_DIR/head-name" ]; then
 349                branch=`cat "$GIT_DIR/head-name"`
 350            else
 351                branch=master
 352            fi ;;
 353         1) git show-ref --verify --quiet -- "refs/heads/$1" ||
 354                die "$1 does not seem to be a valid branch"
 355            branch="$1" ;;
 356         *)
 357             usage ;;
 358         esac
 359         if git checkout "$branch"; then
 360                 rm -f "$GIT_DIR/head-name"
 361                 bisect_clean_state
 362         fi
 363 }
 364
 365 bisect_clean_state() {
 366         rm -fr "$GIT_DIR/refs/bisect"
 367         rm -f "$GIT_DIR/refs/heads/bisect"
 368         rm -f "$GIT_DIR/BISECT_LOG"
 369         rm -f "$GIT_DIR/BISECT_NAMES"
 370         rm -f "$GIT_DIR/BISECT_RUN"
 371 }
 372
 373 bisect_replay () {
 374         test -r "$1" || die "cannot read $1 for replaying"
 375         bisect_reset
 376         while read bisect command rev
 377         do
 378                 test "$bisect" = "git-bisect" || continue
 379                 case "$command" in
 380                 start)
 381                         cmd="bisect_start $rev"
 382                         eval "$cmd" ;;
 383                 good|bad|skip)
 384                         bisect_write "$command" "$rev" ;;
 385                 *)
 386                         die "?? what are you talking about?" ;;
 387                 esac
 388         done <"$1"
 389         bisect_auto_next
 390 }
 391
 392 bisect_run () {
 393     bisect_next_check fail
 394
 395     while true
 396     do
 397       echo "running $@"
 398       "$@"
 399       res=$?
 400
 401       # Check for really bad run error.
 402       if [ $res -lt 0 -o $res -ge 128 ]; then
 403           echo >&2 "bisect run failed:"
 404           echo >&2 "exit code $res from '$@' is < 0 or >= 128"
 405           exit $res
 406       fi
 407
 408       # Use "bisect_good" or "bisect_bad"
 409       # depending on run success or failure.
 410       if [ $res -gt 0 ]; then
 411           next_bisect='bisect_bad'
 412       else
 413           next_bisect='bisect_good'
 414       fi
 415
 416       # We have to use a subshell because bisect_good or
 417       # bisect_bad functions can exit.
 418       ( $next_bisect > "$GIT_DIR/BISECT_RUN" )
 419       res=$?
 420
 421       cat "$GIT_DIR/BISECT_RUN"
 422
 423       if [ $res -ne 0 ]; then
 424           echo >&2 "bisect run failed:"
 425           echo >&2 "$next_bisect exited with error code $res"
 426           exit $res
 427       fi
 428
 429       if grep "is first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
 430           echo "bisect run success"
 431           exit 0;
 432       fi
 433
 434     done
 435 }
 436
 437
 438 case "$#" in
 439 0)
 440     usage ;;
 441 *)
 442     cmd="$1"
 443     shift
 444     case "$cmd" in
 445     start)
 446         bisect_start "$@" ;;
 447     bad)
 448         bisect_bad "$@" ;;
 449     good)
 450         bisect_good "$@" ;;
 451     skip)
 452         bisect_skip "$@" ;;
 453     next)
 454         # Not sure we want "next" at the UI level anymore.
 455         bisect_next "$@" ;;
 456     visualize)
 457         bisect_visualize "$@" ;;
 458     reset)
 459         bisect_reset "$@" ;;
 460     replay)
 461         bisect_replay "$@" ;;
 462     log)
 463         cat "$GIT_DIR/BISECT_LOG" ;;
 464     run)
 465         bisect_run "$@" ;;
 466     *)
 467         usage ;;
 468     esac
 469 esac