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