From e1936d57f8a5fdd205557fbe7b78f8fc7c26ee5a Mon Sep 17 00:00:00 2001
From: Jeff Lowdermilk <jeffml@google.com>
Date: Fri, 22 May 2015 09:44:00 -0700
Subject: [PATCH] Make rolling-update actually parse filenames from stdin

---
 pkg/kubectl/cmd/rollingupdate.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkg/kubectl/cmd/rollingupdate.go b/pkg/kubectl/cmd/rollingupdate.go
index ed55e41d723..e15166c78da 100644
--- a/pkg/kubectl/cmd/rollingupdate.go
+++ b/pkg/kubectl/cmd/rollingupdate.go
@@ -161,6 +161,14 @@ func RunRollingUpdate(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, arg
 			return err
 		}
 		var ok bool
+		// Handle filename input from stdin. The resource builder always returns an api.List
+		// when creating resource(s) from a stream.
+		if list, ok := obj.(*api.List); ok {
+			if len(list.Items) > 1 {
+				return cmdutil.UsageError(cmd, "%s specifies multiple items", filename)
+			}
+			obj = list.Items[0]
+		}
 		newRc, ok = obj.(*api.ReplicationController)
 		if !ok {
 			if _, kind, err := typer.ObjectVersionAndKind(obj); err == nil {