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 run <cmd>...
  21         use <cmd>... to automatically bisect.'
  22
  23 . git-sh-setup
  24 require_work_tree
  25
  26 sq() {
  27         @@PERL@@ -e '
  28                 for (@ARGV) {
  29                         s/'\''/'\'\\\\\'\''/g;
  30                         print " '\''$_'\''";
  31                 }
  32                 print "\n";
  33         ' "$@"
  34 }
  35
  36 bisect_autostart() {
  37         test -d "$GIT_DIR/refs/bisect" || {
  38                 echo >&2 'You need to start by "git bisect start"'
  39                 if test -t 0
  40                 then
  41                         echo >&2 -n 'Do you want me to do it for you [Y/n]? '
  42                         read yesno
  43                         case "$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. If we were bisecting before this, reset to the
  57         # top-of-line master first!
  58         #
  59         head=$(GIT_DIR="$GIT_DIR" git symbolic-ref HEAD) ||
  60         die "Bad HEAD - I need a symbolic ref"
  61         case "$head" in
  62         refs/heads/bisect)
  63                 if [ -s "$GIT_DIR/head-name" ]; then
  64                     branch=`cat "$GIT_DIR/head-name"`
  65                 else
  66                     branch=master
  67                 fi
  68                 git checkout $branch || exit
  69                 ;;
  70         refs/heads/*)
  71                 [ -s "$GIT_DIR/head-name" ] && die "won't bisect on seeked tree"
  72                 echo "$head" | sed 's#^refs/heads/##' >"$GIT_DIR/head-name"
  73                 ;;
  74         *)
  75                 die "Bad HEAD - strange symbolic ref"
  76                 ;;
  77         esac
  78
  79         #
  80         # Get rid of any old bisect state
  81         #
  82         bisect_clean_state
  83         mkdir "$GIT_DIR/refs/bisect"
  84
  85         #
  86         # Check for one bad and then some good revisions.
  87         #
  88         has_double_dash=0
  89         for arg; do
  90             case "$arg" in --) has_double_dash=1; break ;; esac
  91         done
  92         orig_args=$(sq "$@")
  93         bad_seen=0
  94         while [ $# -gt 0 ]; do
  95             arg="$1"
  96             case "$arg" in
  97             --)
  98                 shift
  99                 break
 100                 ;;
 101             *)
 102                 rev=$(git rev-parse --verify "$arg^{commit}" 2>/dev/null) || {
 103                     test $has_double_dash -eq 1 &&
 104                         die "'$arg' does not appear to be a valid revision"
 105                     break
 106                 }
 107                 if [ $bad_seen -eq 0 ]; then
 108                     bad_seen=1
 109                     bisect_write_bad "$rev"
 110                 else
 111                     bisect_write_good "$rev"
 112                 fi
 113                 shift
 114                 ;;
 115             esac
 116         done
 117
 118         sq "$@" >"$GIT_DIR/BISECT_NAMES"
 119         echo "git-bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG"
 120         bisect_auto_next
 121 }
 122
 123 bisect_bad() {
 124         bisect_autostart
 125         case "$#" in
 126         0)
 127                 rev=$(git rev-parse --verify HEAD) ;;
 128         1)
 129                 rev=$(git rev-parse --verify "$1^{commit}") ;;
 130         *)
 131                 usage ;;
 132         esac || exit
 133         bisect_write_bad "$rev"
 134         echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
 135         bisect_auto_next
 136 }
 137
 138 bisect_write_bad() {
 139         rev="$1"
 140         echo "$rev" >"$GIT_DIR/refs/bisect/bad"
 141         echo "# bad: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
 142 }
 143
 144 bisect_good() {
 145         bisect_autostart
 146         case "$#" in
 147         0)    revs=$(git rev-parse --verify HEAD) || exit ;;
 148         *)    revs=$(git rev-parse --revs-only --no-flags "$@") &&
 149                 test '' != "$revs" || die "Bad rev input: $@" ;;
 150         esac
 151         for rev in $revs
 152         do
 153                 rev=$(git rev-parse --verify "$rev^{commit}") || exit
 154                 bisect_write_good "$rev"
 155                 echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
 156
 157         done
 158         bisect_auto_next
 159 }
 160
 161 bisect_write_good() {
 162         rev="$1"
 163         echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
 164         echo "# good: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
 165 }
 166
 167 bisect_next_check() {
 168         missing_good= missing_bad=
 169         git show-ref -q --verify refs/bisect/bad || missing_bad=t
 170         test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
 171
 172         case "$missing_good,$missing_bad,$1" in
 173         ,,*)
 174                 : have both good and bad - ok
 175                 ;;
 176         *,)
 177                 # do not have both but not asked to fail - just report.
 178                 false
 179                 ;;
 180         t,,good)
 181                 # have bad but not good.  we could bisect although
 182                 # this is less optimum.
 183                 echo >&2 'Warning: bisecting only with a bad commit.'
 184                 if test -t 0
 185                 then
 186                         printf >&2 'Are you sure [Y/n]? '
 187                         case "$(read yesno)" in [Nn]*) exit 1 ;; esac
 188                 fi
 189                 : bisect without good...
 190                 ;;
 191         *)
 192                 THEN=''
 193                 test -d "$GIT_DIR/refs/bisect" || {
 194                         echo >&2 'You need to start by "git bisect start".'
 195                         THEN='then '
 196                 }
 197                 echo >&2 'You '$THEN'need to give me at least one good' \
 198                         'and one bad revisions.'
 199                 echo >&2 '(You can use "git bisect bad" and' \
 200                         '"git bisect good" for that.)'
 201                 exit 1 ;;
 202         esac
 203 }
 204
 205 bisect_auto_next() {
 206         bisect_next_check && bisect_next || :
 207 }
 208
 209 bisect_next() {
 210         case "$#" in 0) ;; *) usage ;; esac
 211         bisect_autostart
 212         bisect_next_check good
 213
 214         bad=$(git rev-parse --verify refs/bisect/bad) &&
 215         good=$(git for-each-ref --format='^%(objectname)' \
 216                 "refs/bisect/good-*" | tr '[\012]' ' ') &&
 217         eval="git rev-list --bisect-vars $good $bad --" &&
 218         eval="$eval $(cat "$GIT_DIR/BISECT_NAMES")" &&
 219         eval=$(eval "$eval") &&
 220         eval "$eval" || exit
 221
 222         if [ -z "$bisect_rev" ]; then
 223                 echo "$bad was both good and bad"
 224                 exit 1
 225         fi
 226         if [ "$bisect_rev" = "$bad" ]; then
 227                 echo "$bisect_rev is first bad commit"
 228                 git diff-tree --pretty $bisect_rev
 229                 exit 0
 230         fi
 231
 232         echo "Bisecting: $bisect_nr revisions left to test after this"
 233         echo "$bisect_rev" >"$GIT_DIR/refs/heads/new-bisect"
 234         git checkout -q new-bisect || exit
 235         mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
 236         GIT_DIR="$GIT_DIR" git symbolic-ref HEAD refs/heads/bisect
 237         git show-branch "$bisect_rev"
 238 }
 239
 240 bisect_visualize() {
 241         bisect_next_check fail
 242         not=`cd "$GIT_DIR/refs" && echo bisect/good-*`
 243         eval gitk bisect/bad --not $not -- $(cat "$GIT_DIR/BISECT_NAMES")
 244 }
 245
 246 bisect_reset() {
 247         case "$#" in
 248         0) if [ -s "$GIT_DIR/head-name" ]; then
 249                branch=`cat "$GIT_DIR/head-name"`
 250            else
 251                branch=master
 252            fi ;;
 253         1) git show-ref --verify --quiet -- "refs/heads/$1" || {
 254                echo >&2 "$1 does not seem to be a valid branch"
 255                exit 1
 256            }
 257            branch="$1" ;;
 258         *)
 259             usage ;;
 260         esac
 261         if git checkout "$branch"; then
 262                 rm -f "$GIT_DIR/head-name"
 263                 bisect_clean_state
 264         fi
 265 }
 266
 267 bisect_clean_state() {
 268         rm -fr "$GIT_DIR/refs/bisect"
 269         rm -f "$GIT_DIR/refs/heads/bisect"
 270         rm -f "$GIT_DIR/BISECT_LOG"
 271         rm -f "$GIT_DIR/BISECT_NAMES"
 272         rm -f "$GIT_DIR/BISECT_RUN"
 273 }
 274
 275 bisect_replay () {
 276         test -r "$1" || {
 277                 echo >&2 "cannot read $1 for replaying"
 278                 exit 1
 279         }
 280         bisect_reset
 281         while read bisect command rev
 282         do
 283                 test "$bisect" = "git-bisect" || continue
 284                 case "$command" in
 285                 start)
 286                         cmd="bisect_start $rev"
 287                         eval "$cmd"
 288                         ;;
 289                 good)
 290                         echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
 291                         echo "# good: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
 292                         echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
 293                         ;;
 294                 bad)
 295                         echo "$rev" >"$GIT_DIR/refs/bisect/bad"
 296                         echo "# bad: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
 297                         echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
 298                         ;;
 299                 *)
 300                         echo >&2 "?? what are you talking about?"
 301                         exit 1 ;;
 302                 esac
 303         done <"$1"
 304         bisect_auto_next
 305 }
 306
 307 bisect_run () {
 308     bisect_next_check fail
 309
 310     while true
 311     do
 312       echo "running $@"
 313       "$@"
 314       res=$?
 315
 316       # Check for really bad run error.
 317       if [ $res -lt 0 -o $res -ge 128 ]; then
 318           echo >&2 "bisect run failed:"
 319           echo >&2 "exit code $res from '$@' is < 0 or >= 128"
 320           exit $res
 321       fi
 322
 323       # Use "bisect_good" or "bisect_bad"
 324       # depending on run success or failure.
 325       if [ $res -gt 0 ]; then
 326           next_bisect='bisect_bad'
 327       else
 328           next_bisect='bisect_good'
 329       fi
 330
 331       # We have to use a subshell because bisect_good or
 332       # bisect_bad functions can exit.
 333       ( $next_bisect > "$GIT_DIR/BISECT_RUN" )
 334       res=$?
 335
 336       cat "$GIT_DIR/BISECT_RUN"
 337
 338       if [ $res -ne 0 ]; then
 339           echo >&2 "bisect run failed:"
 340           echo >&2 "$next_bisect exited with error code $res"
 341           exit $res
 342       fi
 343
 344       if grep "is first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
 345           echo "bisect run success"
 346           exit 0;
 347       fi
 348
 349     done
 350 }
 351
 352
 353 case "$#" in
 354 0)
 355     usage ;;
 356 *)
 357     cmd="$1"
 358     shift
 359     case "$cmd" in
 360     start)
 361         bisect_start "$@" ;;
 362     bad)
 363         bisect_bad "$@" ;;
 364     good)
 365         bisect_good "$@" ;;
 366     next)
 367         # Not sure we want "next" at the UI level anymore.
 368         bisect_next "$@" ;;
 369     visualize)
 370         bisect_visualize "$@" ;;
 371     reset)
 372         bisect_reset "$@" ;;
 373     replay)
 374         bisect_replay "$@" ;;
 375     log)
 376         cat "$GIT_DIR/BISECT_LOG" ;;
 377     run)
 378         bisect_run "$@" ;;
 379     *)
 380         usage ;;
 381     esac
 382 esac