Merge branch 'ef/maint-rebase-error-message' into maint

When "git rebase" was given a bad commit to replay the history on,
its error message did not correctly give the command line argument
it had trouble parsing.

By Erik Faye-Lund
* ef/maint-rebase-error-message:
  rebase: report invalid commit correctly

Author: gitster

git-rebase.sh

@@ -418,7 +418,7 @@ case "$onto_name" in
 	;;
 *)
 	onto=$(git rev-parse --verify "${onto_name}^0") ||
-	die "Does not point to a valid commit: $1"
+	die "Does not point to a valid commit: $onto_name"
 	;;
 esac
 

t/t3406-rebase-message.sh

@@ -62,4 +62,9 @@ test_expect_success 'rebase -n overrides config rebase.stat config' '
         ! grep "^ fileX |  *1 +$" diffstat.txt
 '
 
+test_expect_success 'rebase --onto outputs the invalid ref' '
+	test_must_fail git rebase --onto invalid-ref HEAD HEAD 2>err &&
+	grep "invalid-ref" err
+'
+
 test_done