1 files changed, 348 insertions, 0 deletions
diff --git a/git-bisect.sh b/git-bisect.sh
new file mode 100755
index 0000000000..efee12b8b1
--- /dev/null
+++ b/git-bisect.sh
@@ -0,0 +1,348 @@
+#!/bin/sh
+
+USAGE='[help|start|bad|good|new|old|terms|skip|next|reset|visualize|view|replay|log|run]'
+LONG_USAGE='git bisect help
+	print this long help message.
+git bisect start [--term-{old,good}=<term> --term-{new,bad}=<term>]
+		 [--no-checkout] [<bad> [<good>...]] [--] [<pathspec>...]
+	reset bisect state and start bisection.
+git bisect (bad|new) [<rev>]
+	mark <rev> a known-bad revision/
+		a revision after change in a given property.
+git bisect (good|old) [<rev>...]
+	mark <rev>... known-good revisions/
+		revisions before change in a given property.
+git bisect terms [--term-good | --term-bad]
+	show the terms used for old and new commits (default: bad, good)
+git bisect skip [(<rev>|<range>)...]
+	mark <rev>... untestable revisions.
+git bisect next
+	find next bisection to test and check it out.
+git bisect reset [<commit>]
+	finish bisection search and go back to commit.
+git bisect (visualize|view)
+	show bisect status in gitk.
+git bisect replay <logfile>
+	replay bisection log.
+git bisect log
+	show bisect log.
+git bisect run <cmd>...
+	use <cmd>... to automatically bisect.
+
+Please use "git help bisect" to get the full man page.'
+
+OPTIONS_SPEC=
+. git-sh-setup
+
+_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
+_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
+TERM_BAD=bad
+TERM_GOOD=good
+
+bisect_head()
+{
+	if test -f "$GIT_DIR/BISECT_HEAD"
+	then
+		echo BISECT_HEAD
+	else
+		echo HEAD
+	fi
+}
+
+bisect_autostart() {
+	test -s "$GIT_DIR/BISECT_START" || {
+		gettextln "You need to start by \"git bisect start\"" >&2
+		if test -t 0
+		then
+			# TRANSLATORS: Make sure to include [Y] and [n] in your
+			# translation. The program will only accept English input
+			# at this point.
+			gettext "Do you want me to do it for you [Y/n]? " >&2
+			read yesno
+			case "$yesno" in
+			[Nn]*)
+				exit ;;
+			esac
+			bisect_start
+		else
+			exit 1
+		fi
+	}
+}
+
+bisect_start() {
+	git bisect--helper --bisect-start $@ || exit
+
+	#
+	# Change state.
+	# In case of mistaken revs or checkout error, or signals received,
+	# "bisect_auto_next" below may exit or misbehave.
+	# We have to trap this to be able to clean up using
+	# "bisect_clean_state".
+	#
+	trap 'git bisect--helper --bisect-clean-state' 0
+	trap 'exit 255' 1 2 3 15
+
+	#
+	# Check if we can proceed to the next bisect state.
+	#
+	get_terms
+	bisect_auto_next
+
+	trap '-' 0
+}
+
+bisect_skip() {
+	all=''
+	for arg in "$@"
+	do
+		case "$arg" in
+		*..*)
+			revs=$(git rev-list "$arg") || die "$(eval_gettext "Bad rev input: \$arg")" ;;
+		*)
+			revs=$(git rev-parse --sq-quote "$arg") ;;
+		esac
+		all="$all $revs"
+	done
+	eval bisect_state 'skip' $all
+}
+
+bisect_state() {
+	bisect_autostart
+	state=$1
+	git bisect--helper --check-and-set-terms $state $TERM_GOOD $TERM_BAD || exit
+	get_terms
+	case "$#,$state" in
+	0,*)
+		die "Please call 'bisect_state' with at least one argument." ;;
+	1,"$TERM_BAD"|1,"$TERM_GOOD"|1,skip)
+		bisected_head=$(bisect_head)
+		rev=$(git rev-parse --verify "$bisected_head") ||
+			die "$(eval_gettext "Bad rev input: \$bisected_head")"
+		git bisect--helper --bisect-write "$state" "$rev" "$TERM_GOOD" "$TERM_BAD" || exit
+		git bisect--helper --check-expected-revs "$rev" ;;
+	2,"$TERM_BAD"|*,"$TERM_GOOD"|*,skip)
+		shift
+		hash_list=''
+		for rev in "$@"
+		do
+			sha=$(git rev-parse --verify "$rev^{commit}") ||
+				die "$(eval_gettext "Bad rev input: \$rev")"
+			hash_list="$hash_list $sha"
+		done
+		for rev in $hash_list
+		do
+			git bisect--helper --bisect-write "$state" "$rev" "$TERM_GOOD" "$TERM_BAD" || exit
+		done
+		git bisect--helper --check-expected-revs $hash_list ;;
+	*,"$TERM_BAD")
+		die "$(eval_gettext "'git bisect \$TERM_BAD' can take only one argument.")" ;;
+	*)
+		usage ;;
+	esac
+	bisect_auto_next
+}
+
+bisect_auto_next() {
+	git bisect--helper --bisect-next-check $TERM_GOOD $TERM_BAD && bisect_next || :
+}
+
+bisect_next() {
+	case "$#" in 0) ;; *) usage ;; esac
+	bisect_autostart
+	git bisect--helper --bisect-next-check $TERM_GOOD $TERM_BAD $TERM_GOOD|| exit
+
+	# Perform all bisection computation, display and checkout
+	git bisect--helper --next-all $(test -f "$GIT_DIR/BISECT_HEAD" && echo --no-checkout)
+	res=$?
+
+	# Check if we should exit because bisection is finished
+	if test $res -eq 10
+	then
+		bad_rev=$(git show-ref --hash --verify refs/bisect/$TERM_BAD)
+		bad_commit=$(git show-branch $bad_rev)
+		echo "# first $TERM_BAD commit: $bad_commit" >>"$GIT_DIR/BISECT_LOG"
+		exit 0
+	elif test $res -eq 2
+	then
+		echo "# only skipped commits left to test" >>"$GIT_DIR/BISECT_LOG"
+		good_revs=$(git for-each-ref --format="%(objectname)" "refs/bisect/$TERM_GOOD-*")
+		for skipped in $(git rev-list refs/bisect/$TERM_BAD --not $good_revs)
+		do
+			skipped_commit=$(git show-branch $skipped)
+			echo "# possible first $TERM_BAD commit: $skipped_commit" >>"$GIT_DIR/BISECT_LOG"
+		done
+		exit $res
+	fi
+
+	# Check for an error in the bisection process
+	test $res -ne 0 && exit $res
+
+	return 0
+}
+
+bisect_visualize() {
+	git bisect--helper --bisect-next-check $TERM_GOOD $TERM_BAD fail || exit
+
+	if test $# = 0
+	then
+		if test -n "${DISPLAY+set}${SESSIONNAME+set}${MSYSTEM+set}${SECURITYSESSIONID+set}" &&
+			type gitk >/dev/null 2>&1
+		then
+			set gitk
+		else
+			set git log
+		fi
+	else
+		case "$1" in
+		git*|tig) ;;
+		-*)	set git log "$@" ;;
+		*)	set git "$@" ;;
+		esac
+	fi
+
+	eval '"$@"' --bisect -- $(cat "$GIT_DIR/BISECT_NAMES")
+}
+
+bisect_replay () {
+	file="$1"
+	test "$#" -eq 1 || die "$(gettext "No logfile given")"
+	test -r "$file" || die "$(eval_gettext "cannot read \$file for replaying")"
+	git bisect--helper --bisect-reset || exit
+	while read git bisect command rev
+	do
+		test "$git $bisect" = "git bisect" || test "$git" = "git-bisect" || continue
+		if test "$git" = "git-bisect"
+		then
+			rev="$command"
+			command="$bisect"
+		fi
+		get_terms
+		git bisect--helper --check-and-set-terms "$command" "$TERM_GOOD" "$TERM_BAD" || exit
+		get_terms
+		case "$command" in
+		start)
+			cmd="bisect_start $rev"
+			eval "$cmd" ;;
+		"$TERM_GOOD"|"$TERM_BAD"|skip)
+			git bisect--helper --bisect-write "$command" "$rev" "$TERM_GOOD" "$TERM_BAD" || exit;;
+		terms)
+			git bisect--helper --bisect-terms $rev || exit;;
+		*)
+			die "$(gettext "?? what are you talking about?")" ;;
+		esac
+	done <"$file"
+	bisect_auto_next
+}
+
+bisect_run () {
+	git bisect--helper --bisect-next-check $TERM_GOOD $TERM_BAD fail || exit
+
+	test -n "$*" || die "$(gettext "bisect run failed: no command provided.")"
+
+	while true
+	do
+		command="$@"
+		eval_gettextln "running \$command"
+		"$@"
+		res=$?
+
+		# Check for really bad run error.
+		if [ $res -lt 0 -o $res -ge 128 ]
+		then
+			eval_gettextln "bisect run failed:
+exit code \$res from '\$command' is < 0 or >= 128" >&2
+			exit $res
+		fi
+
+		# Find current state depending on run success or failure.
+		# A special exit code of 125 means cannot test.
+		if [ $res -eq 125 ]
+		then
+			state='skip'
+		elif [ $res -gt 0 ]
+		then
+			state="$TERM_BAD"
+		else
+			state="$TERM_GOOD"
+		fi
+
+		# We have to use a subshell because "bisect_state" can exit.
+		( bisect_state $state >"$GIT_DIR/BISECT_RUN" )
+		res=$?
+
+		cat "$GIT_DIR/BISECT_RUN"
+
+		if sane_grep "first $TERM_BAD commit could be any of" "$GIT_DIR/BISECT_RUN" \
+			>/dev/null
+		then
+			gettextln "bisect run cannot continue any more" >&2
+			exit $res
+		fi
+
+		if [ $res -ne 0 ]
+		then
+			eval_gettextln "bisect run failed:
+'bisect_state \$state' exited with error code \$res" >&2
+			exit $res
+		fi
+
+		if sane_grep "is the first $TERM_BAD commit" "$GIT_DIR/BISECT_RUN" >/dev/null
+		then
+			gettextln "bisect run success"
+			exit 0;
+		fi
+
+	done
+}
+
+bisect_log () {
+	test -s "$GIT_DIR/BISECT_LOG" || die "$(gettext "We are not bisecting.")"
+	cat "$GIT_DIR/BISECT_LOG"
+}
+
+get_terms () {
+	if test -s "$GIT_DIR/BISECT_TERMS"
+	then
+		{
+		read TERM_BAD
+		read TERM_GOOD
+		} <"$GIT_DIR/BISECT_TERMS"
+	fi
+}
+
+case "$#" in
+0)
+	usage ;;
+*)
+	cmd="$1"
+	get_terms
+	shift
+	case "$cmd" in
+	help)
+		git bisect -h ;;
+	start)
+		bisect_start "$@" ;;
+	bad|good|new|old|"$TERM_BAD"|"$TERM_GOOD")
+		bisect_state "$cmd" "$@" ;;
+	skip)
+		bisect_skip "$@" ;;
+	next)
+		# Not sure we want "next" at the UI level anymore.
+		bisect_next "$@" ;;
+	visualize|view)
+		bisect_visualize "$@" ;;
+	reset)
+		git bisect--helper --bisect-reset "$@" ;;
+	replay)
+		bisect_replay "$@" ;;
+	log)
+		bisect_log ;;
+	run)
+		bisect_run "$@" ;;
+	terms)
+		git bisect--helper --bisect-terms "$@" || exit;;
+	*)
+		usage ;;
+	esac
+esac