1 files changed, 20 insertions, 1 deletions
diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 6ed57e2..1560e84 100755
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -495,6 +495,25 @@ get_saved_options () {
 	test -f "$DOTEST"/rebase-root && REBASE_ROOT=t
 }
 
+LF='
+'
+parse_onto () {
+	case "$1" in
+	*...*)
+		if	left=${1%...*} right=${1#*...} &&
+			onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
+		then
+			case "$onto" in
+			?*"$LF"?* | '')
+				exit 1 ;;
+			esac
+			echo "$onto"
+			exit 0
+		fi
+	esac
+	git rev-parse --verify "$1^0"
+}
+
 while test $# != 0
 do
 	case "$1" in
@@ -602,7 +621,7 @@ first and then run 'git rebase --continue' again."
 		;;
 	--onto)
 		shift
-		ONTO=$(git rev-parse --verify "$1") ||
+		ONTO=$(parse_onto "$1") ||
 			die "Does not point to a valid commit: $1"
 		;;
 	--)