git-bisect.sh

   1 #!/bin/sh
   2
   3 USAGE='[start|bad|good|skip|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 skip [<rev>...]
  11         mark <rev>... untestable revisions.
  12 git bisect next
  13         find next bisection to test and check it out.
  14 git bisect reset [<branch>]
  15         finish bisection search and go back to branch.
  16 git bisect visualize
  17         show bisect status in gitk.
  18 git bisect replay <logfile>
  19         replay bisection log.
  20 git bisect log
  21         show bisect log.
  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_state() {
 139         bisect_autostart
 140         state=$1
 141         case "$#,$state" in
 142         0,*)
 143                 die "Please call 'bisect_state' with at least one argument." ;;
 144         1,bad|1,good|1,skip)
 145                 rev=$(git rev-parse --verify HEAD) ||
 146                         die "Bad rev input: HEAD"
 147                 bisect_write "$state" "$rev" ;;
 148         2,bad)
 149                 rev=$(git rev-parse --verify "$2^{commit}") ||
 150                         die "Bad rev input: $2"
 151                 bisect_write "$state" "$rev" ;;
 152         *,good|*,skip)
 153                 shift
 154                 revs=$(git rev-parse --revs-only --no-flags "$@") &&
 155                         test '' != "$revs" || die "Bad rev input: $@"
 156                 for rev in $revs
 157                 do
 158                         rev=$(git rev-parse --verify "$rev^{commit}") ||
 159                                 die "Bad rev commit: $rev^{commit}"
 160                         bisect_write "$state" "$rev"
 161                 done ;;
 162         *)
 163                 usage ;;
 164         esac
 165         bisect_auto_next
 166 }
 167
 168 bisect_next_check() {
 169         missing_good= missing_bad=
 170         git show-ref -q --verify refs/bisect/bad || missing_bad=t
 171         test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
 172
 173         case "$missing_good,$missing_bad,$1" in
 174         ,,*)
 175                 : have both good and bad - ok
 176                 ;;
 177         *,)
 178                 # do not have both but not asked to fail - just report.
 179                 false
 180                 ;;
 181         t,,good)
 182                 # have bad but not good.  we could bisect although
 183                 # this is less optimum.
 184                 echo >&2 'Warning: bisecting only with a bad commit.'
 185                 if test -t 0
 186                 then
 187                         printf >&2 'Are you sure [Y/n]? '
 188                         case "$(read yesno)" in [Nn]*) exit 1 ;; esac
 189                 fi
 190                 : bisect without good...
 191                 ;;
 192         *)
 193                 THEN=''
 194                 test -d "$GIT_DIR/refs/bisect" || {
 195                         echo >&2 'You need to start by "git bisect start".'
 196                         THEN='then '
 197                 }
 198                 echo >&2 'You '$THEN'need to give me at least one good' \
 199                         'and one bad revisions.'
 200                 echo >&2 '(You can use "git bisect bad" and' \
 201                         '"git bisect good" for that.)'
 202                 exit 1 ;;
 203         esac
 204 }
 205
 206 bisect_auto_next() {
 207         bisect_next_check && bisect_next || :
 208 }
 209
 210 filter_skipped() {
 211         _eval="$1"
 212         _skip="$2"
 213
 214         if [ -z "$_skip" ]; then
 215                 eval $_eval
 216                 return
 217         fi
 218
 219         # Let's parse the output of:
 220         # "git rev-list --bisect-vars --bisect-all ..."
 221         eval $_eval | while read hash line
 222         do
 223                 case "$VARS,$FOUND,$TRIED,$hash" in
 224                         # We display some vars.
 225                         1,*,*,*) echo "$hash $line" ;;
 226
 227                         # Split line.
 228                         ,*,*,---*) ;;
 229
 230                         # We had nothing to search.
 231                         ,,,bisect_rev*)
 232                                 echo "bisect_rev="
 233                                 VARS=1
 234                                 ;;
 235
 236                         # We did not find a good bisect rev.
 237                         # This should happen only if the "bad"
 238                         # commit is also a "skip" commit.
 239                         ,,*,bisect_rev*)
 240                                 echo "bisect_rev=$TRIED"
 241                                 VARS=1
 242                                 ;;
 243
 244                         # We are searching.
 245                         ,,*,*)
 246                                 TRIED="${TRIED:+$TRIED|}$hash"
 247                                 case "$_skip" in
 248                                 *$hash*) ;;
 249                                 *)
 250                                         echo "bisect_rev=$hash"
 251                                         echo "bisect_tried=\"$TRIED\""
 252                                         FOUND=1
 253                                         ;;
 254                                 esac
 255                                 ;;
 256
 257                         # We have already found a rev to be tested.
 258                         ,1,*,bisect_rev*) VARS=1 ;;
 259                         ,1,*,*) ;;
 260
 261                         # ???
 262                         *) die "filter_skipped error " \
 263                             "VARS: '$VARS' " \
 264                             "FOUND: '$FOUND' " \
 265                             "TRIED: '$TRIED' " \
 266                             "hash: '$hash' " \
 267                             "line: '$line'"
 268                         ;;
 269                 esac
 270         done
 271 }
 272
 273 exit_if_skipped_commits () {
 274         _tried=$1
 275         if expr "$_tried" : ".*[|].*" > /dev/null ; then
 276                 echo "There are only 'skip'ped commit left to test."
 277                 echo "The first bad commit could be any of:"
 278                 echo "$_tried" | sed -e 's/[|]/\
 279 /g'
 280                 echo "We cannot bisect more!"
 281                 exit 2
 282         fi
 283 }
 284
 285 bisect_next() {
 286         case "$#" in 0) ;; *) usage ;; esac
 287         bisect_autostart
 288         bisect_next_check good
 289
 290         skip=$(git for-each-ref --format='%(objectname)' \
 291                 "refs/bisect/skip-*" | tr '[\012]' ' ') || exit
 292
 293         BISECT_OPT=''
 294         test -n "$skip" && BISECT_OPT='--bisect-all'
 295
 296         bad=$(git rev-parse --verify refs/bisect/bad) &&
 297         good=$(git for-each-ref --format='^%(objectname)' \
 298                 "refs/bisect/good-*" | tr '[\012]' ' ') &&
 299         eval="git rev-list --bisect-vars $BISECT_OPT $good $bad --" &&
 300         eval="$eval $(cat "$GIT_DIR/BISECT_NAMES")" &&
 301         eval=$(filter_skipped "$eval" "$skip") &&
 302         eval "$eval" || exit
 303
 304         if [ -z "$bisect_rev" ]; then
 305                 echo "$bad was both good and bad"
 306                 exit 1
 307         fi
 308         if [ "$bisect_rev" = "$bad" ]; then
 309                 exit_if_skipped_commits "$bisect_tried"
 310                 echo "$bisect_rev is first bad commit"
 311                 git diff-tree --pretty $bisect_rev
 312                 exit 0
 313         fi
 314
 315         # We should exit here only if the "bad"
 316         # commit is also a "skip" commit (see above).
 317         exit_if_skipped_commits "$bisect_rev"
 318
 319         echo "Bisecting: $bisect_nr revisions left to test after this"
 320         echo "$bisect_rev" >"$GIT_DIR/refs/heads/new-bisect"
 321         git checkout -q new-bisect || exit
 322         mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
 323         GIT_DIR="$GIT_DIR" git symbolic-ref HEAD refs/heads/bisect
 324         git show-branch "$bisect_rev"
 325 }
 326
 327 bisect_visualize() {
 328         bisect_next_check fail
 329         not=`cd "$GIT_DIR/refs" && echo bisect/good-*`
 330         eval gitk bisect/bad --not $not -- $(cat "$GIT_DIR/BISECT_NAMES")
 331 }
 332
 333 bisect_reset() {
 334         case "$#" in
 335         0) if [ -s "$GIT_DIR/head-name" ]; then
 336                branch=`cat "$GIT_DIR/head-name"`
 337            else
 338                branch=master
 339            fi ;;
 340         1) git show-ref --verify --quiet -- "refs/heads/$1" ||
 341                die "$1 does not seem to be a valid branch"
 342            branch="$1" ;;
 343         *)
 344             usage ;;
 345         esac
 346         if git checkout "$branch"; then
 347                 rm -f "$GIT_DIR/head-name"
 348                 bisect_clean_state
 349         fi
 350 }
 351
 352 bisect_clean_state() {
 353         rm -fr "$GIT_DIR/refs/bisect"
 354         rm -f "$GIT_DIR/refs/heads/bisect"
 355         rm -f "$GIT_DIR/BISECT_LOG"
 356         rm -f "$GIT_DIR/BISECT_NAMES"
 357         rm -f "$GIT_DIR/BISECT_RUN"
 358 }
 359
 360 bisect_replay () {
 361         test -r "$1" || die "cannot read $1 for replaying"
 362         bisect_reset
 363         while read bisect command rev
 364         do
 365                 test "$bisect" = "git-bisect" || continue
 366                 case "$command" in
 367                 start)
 368                         cmd="bisect_start $rev"
 369                         eval "$cmd" ;;
 370                 good|bad|skip)
 371                         bisect_write "$command" "$rev" ;;
 372                 *)
 373                         die "?? what are you talking about?" ;;
 374                 esac
 375         done <"$1"
 376         bisect_auto_next
 377 }
 378
 379 bisect_run () {
 380     bisect_next_check fail
 381
 382     while true
 383     do
 384       echo "running $@"
 385       "$@"
 386       res=$?
 387
 388       # Check for really bad run error.
 389       if [ $res -lt 0 -o $res -ge 128 ]; then
 390           echo >&2 "bisect run failed:"
 391           echo >&2 "exit code $res from '$@' is < 0 or >= 128"
 392           exit $res
 393       fi
 394
 395       # Find current state depending on run success or failure.
 396       # A special exit code of 125 means cannot test.
 397       if [ $res -eq 125 ]; then
 398           state='skip'
 399       elif [ $res -gt 0 ]; then
 400           state='bad'
 401       else
 402           state='good'
 403       fi
 404
 405       # We have to use a subshell because "bisect_state" can exit.
 406       ( bisect_state $state > "$GIT_DIR/BISECT_RUN" )
 407       res=$?
 408
 409       cat "$GIT_DIR/BISECT_RUN"
 410
 411       if grep "first bad commit could be any of" "$GIT_DIR/BISECT_RUN" \
 412                 > /dev/null; then
 413           echo >&2 "bisect run cannot continue any more"
 414           exit $res
 415       fi
 416
 417       if [ $res -ne 0 ]; then
 418           echo >&2 "bisect run failed:"
 419           echo >&2 "'bisect_state $state' exited with error code $res"
 420           exit $res
 421       fi
 422
 423       if grep "is first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
 424           echo "bisect run success"
 425           exit 0;
 426       fi
 427
 428     done
 429 }
 430
 431
 432 case "$#" in
 433 0)
 434     usage ;;
 435 *)
 436     cmd="$1"
 437     shift
 438     case "$cmd" in
 439     start)
 440         bisect_start "$@" ;;
 441     bad|good|skip)
 442         bisect_state "$cmd" "$@" ;;
 443     next)
 444         # Not sure we want "next" at the UI level anymore.
 445         bisect_next "$@" ;;
 446     visualize)
 447         bisect_visualize "$@" ;;
 448     reset)
 449         bisect_reset "$@" ;;
 450     replay)
 451         bisect_replay "$@" ;;
 452     log)
 453         cat "$GIT_DIR/BISECT_LOG" ;;
 454     run)
 455         bisect_run "$@" ;;
 456     *)
 457         usage ;;
 458     esac
 459 esac