merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 12 insertions, 70 deletions

diff --git a/third_party/git/git-bisect.sh b/third_party/git/git-bisect.sh
index efee12b8b1..ea7e684ebb 100755
--- a/third_party/git/git-bisect.sh
+++ b/third_party/git/git-bisect.sh
@@ -3,8 +3,8 @@
 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>...]
+git bisect start [--term-{new,bad}=<term> --term-{old,good}=<term>]
+		 [--no-checkout] [--first-parent] [<bad> [<good>...]] [--] [<pathspec>...]
 	reset bisect state and start bisection.
 git bisect (bad|new) [<rev>]
 	mark <rev> a known-bad revision/
@@ -41,7 +41,7 @@ TERM_GOOD=good
 
 bisect_head()
 {
-	if test -f "$GIT_DIR/BISECT_HEAD"
+	if git rev-parse --verify -q BISECT_HEAD > /dev/null
 	then
 		echo BISECT_HEAD
 	else
@@ -49,27 +49,6 @@ bisect_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
 
@@ -86,8 +65,7 @@ bisect_start() {
 	#
 	# Check if we can proceed to the next bisect state.
 	#
-	get_terms
-	bisect_auto_next
+	git bisect--helper --bisect-auto-next || exit
 
 	trap '-' 0
 }
@@ -108,7 +86,7 @@ bisect_skip() {
 }
 
 bisect_state() {
-	bisect_autostart
+	git bisect--helper --bisect-autostart || exit
 	state=$1
 	git bisect--helper --check-and-set-terms $state $TERM_GOOD $TERM_BAD || exit
 	get_terms
@@ -140,45 +118,7 @@ bisect_state() {
 	*)
 		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
+	git bisect--helper --bisect-auto-next
 }
 
 bisect_visualize() {
@@ -209,7 +149,8 @@ bisect_replay () {
 	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
+	oIFS="$IFS" IFS="$IFS$(printf '\015')"
+	while read git bisect command rev tail
 	do
 		test "$git $bisect" = "git bisect" || test "$git" = "git-bisect" || continue
 		if test "$git" = "git-bisect"
@@ -222,7 +163,7 @@ bisect_replay () {
 		get_terms
 		case "$command" in
 		start)
-			cmd="bisect_start $rev"
+			cmd="bisect_start $rev $tail"
 			eval "$cmd" ;;
 		"$TERM_GOOD"|"$TERM_BAD"|skip)
 			git bisect--helper --bisect-write "$command" "$rev" "$TERM_GOOD" "$TERM_BAD" || exit;;
@@ -232,7 +173,8 @@ bisect_replay () {
 			die "$(gettext "?? what are you talking about?")" ;;
 		esac
 	done <"$file"
-	bisect_auto_next
+	IFS="$oIFS"
+	git bisect--helper --bisect-auto-next || exit
 }
 
 bisect_run () {
@@ -329,7 +271,7 @@ case "$#" in
 		bisect_skip "$@" ;;
 	next)
 		# Not sure we want "next" at the UI level anymore.
-		bisect_next "$@" ;;
+		git bisect--helper --bisect-next "$@" || exit ;;
 	visualize|view)
 		bisect_visualize "$@" ;;
 	reset)