Kubectl scale command accepts a filename param

contrib/completions/bash/kubectl

@@ -508,6 +508,12 @@ _kubectl_scale()
     flags_completion=()
 
     flags+=("--current-replicas=")
+    flags+=("--filename=")
+    flags_with_completion+=("--filename")
+    flags_completion+=("__handle_filename_extension_flag json|yaml|yml")
+    two_word_flags+=("-f")
+    flags_with_completion+=("-f")
+    flags_completion+=("__handle_filename_extension_flag json|yaml|yml")
     flags+=("--help")
     flags+=("-h")
     flags+=("--output=")

docs/man/man1/kubectl-scale.1

@@ -27,6 +27,10 @@ scale is sent to the server.
 \fB\-\-current\-replicas\fP=\-1
     Precondition for current size. Requires that the current size of the replication controller match this value in order to scale.
 
+.PP
+\fB\-f\fP, \fB\-\-filename\fP=[]
+    Filename, directory, or URL to a file identifying the replication controller to set a new size
+
 .PP
 \fB\-h\fP, \fB\-\-help\fP=false
     help for scale
@@ -154,6 +158,9 @@ scale is sent to the server.
 # Scale replication controller named 'foo' to 3.
 $ kubectl scale \-\-replicas=3 replicationcontrollers foo
 
+# Scale a replication controller identified by type and name specified in "foo\-controller.yaml" to 3.
+$ kubectl scale \-\-replicas=3 \-f foo\-controller.yaml
+
 # If the replication controller named foo's current size is 2, scale foo to 3.
 $ kubectl scale \-\-current\-replicas=2 \-\-replicas=3 replicationcontrollers foo
 

docs/user-guide/kubectl/kubectl_scale.md

@@ -46,7 +46,7 @@ scale is attempted, and it is guaranteed that the precondition holds true when t
 scale is sent to the server.
 
 ```
-kubectl scale [--resource-version=version] [--current-replicas=count] --replicas=COUNT TYPE NAME
+kubectl scale [--resource-version=version] [--current-replicas=count] --replicas=COUNT (-f FILENAME | TYPE NAME)
 ```
 
 ### Examples
@@ -55,6 +55,9 @@ kubectl scale [--resource-version=version] [--current-replicas=count] --replicas
 # Scale replication controller named 'foo' to 3.
 $ kubectl scale --replicas=3 replicationcontrollers foo
 
+# Scale a replication controller identified by type and name specified in "foo-controller.yaml" to 3.
+$ kubectl scale --replicas=3 -f foo-controller.yaml
+
 # If the replication controller named foo's current size is 2, scale foo to 3.
 $ kubectl scale --current-replicas=2 --replicas=3 replicationcontrollers foo
 
@@ -66,6 +69,7 @@ $ kubectl scale --replicas=5 rc/foo rc/bar
 
 ```
       --current-replicas=-1: Precondition for current size. Requires that the current size of the replication controller match this value in order to scale.
+  -f, --filename=[]: Filename, directory, or URL to a file identifying the replication controller to set a new size
   -h, --help[=false]: help for scale
   -o, --output="": Output mode. Use "-o name" for shorter output (resource/name).
       --replicas=-1: The new desired number of replicas. Required.
@@ -106,7 +110,7 @@ $ kubectl scale --replicas=5 rc/foo rc/bar
 
 * [kubectl](kubectl.md)	 - kubectl controls the Kubernetes cluster manager
 
-###### Auto generated by spf13/cobra at 2015-08-12 16:38:35.551986915 +0000 UTC
+###### Auto generated by spf13/cobra at 2015-08-13 06:25:21.82766402 +0000 UTC
 
 <!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
 [![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/docs/user-guide/kubectl/kubectl_scale.md?pixel)]()

hack/test-cmd.sh

@@ -623,6 +623,14 @@ __EOF__
   # Post-condition: 3 replicas
   kube::test::get_object_assert 'rc frontend' "{{$rc_replicas_field}}" '3'
 
+  ### Scale replication controller from JSON with replicas only
+  # Pre-condition: 3 replicas
+  kube::test::get_object_assert 'rc frontend' "{{$rc_replicas_field}}" '3'
+  # Command
+  kubectl scale  --replicas=2 -f examples/guestbook/frontend-controller.yaml "${kube_flags[@]}"
+  # Post-condition: 2 replicas
+  kube::test::get_object_assert 'rc frontend' "{{$rc_replicas_field}}" '2'
+
   ### Scale multiple replication controllers
   kubectl create -f examples/guestbook/redis-master-controller.yaml "${kube_flags[@]}"
   kubectl create -f examples/guestbook/redis-slave-controller.yaml "${kube_flags[@]}"
@@ -635,8 +643,8 @@ __EOF__
   kubectl delete rc redis-{master,slave} "${kube_flags[@]}"
 
   ### Expose replication controller as service
-  # Pre-condition: 3 replicas
-  kube::test::get_object_assert 'rc frontend' "{{$rc_replicas_field}}" '3'
+  # Pre-condition: 2 replicas
+  kube::test::get_object_assert 'rc frontend' "{{$rc_replicas_field}}" '2'
   # Command
   kubectl expose rc frontend --port=80 "${kube_flags[@]}"
   # Post-condition: service exists and the port is unnamed

pkg/kubectl/cmd/scale.go

@@ -39,6 +39,9 @@ scale is sent to the server.`
 	scale_example = `# Scale replication controller named 'foo' to 3.
 $ kubectl scale --replicas=3 replicationcontrollers foo
 
+# Scale a replication controller identified by type and name specified in "foo-controller.yaml" to 3.
+$ kubectl scale --replicas=3 -f foo-controller.yaml
+
 # If the replication controller named foo's current size is 2, scale foo to 3.
 $ kubectl scale --current-replicas=2 --replicas=3 replicationcontrollers foo
 
@@ -49,7 +52,7 @@ $ kubectl scale --replicas=5 rc/foo rc/bar`
 // NewCmdScale returns a cobra command with the appropriate configuration and flags to run scale
 func NewCmdScale(f *cmdutil.Factory, out io.Writer) *cobra.Command {
 	cmd := &cobra.Command{
-		Use: "scale [--resource-version=version] [--current-replicas=count] --replicas=COUNT TYPE NAME",
+		Use: "scale [--resource-version=version] [--current-replicas=count] --replicas=COUNT (-f FILENAME | TYPE NAME)",
 		// resize is deprecated
 		Aliases: []string{"resize"},
 		Short:   "Set a new size for a Replication Controller.",
@@ -68,6 +71,9 @@ func NewCmdScale(f *cmdutil.Factory, out io.Writer) *cobra.Command {
 	cmd.Flags().Duration("timeout", 0, "The length of time to wait before giving up on a scale operation, zero means don't wait.")
 	cmd.MarkFlagRequired("replicas")
 	cmdutil.AddOutputFlagsForMutation(cmd)
+
+	usage := "Filename, directory, or URL to a file identifying the replication controller to set a new size"
+	kubectl.AddJsonFilenameFlag(cmd, usage)
 	return cmd
 }
 
@@ -82,7 +88,7 @@ func RunScale(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []stri
 		return cmdutil.UsageError(cmd, "--replicas=COUNT TYPE NAME")
 	}
 
-	cmdNamespace, _, err := f.DefaultNamespace()
+	cmdNamespace, enforceNamespace, err := f.DefaultNamespace()
 	if err != nil {
 		return err
 	}
@@ -91,6 +97,7 @@ func RunScale(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []stri
 	r := resource.NewBuilder(mapper, typer, f.ClientMapperForCommand()).
 		ContinueOnError().
 		NamespaceParam(cmdNamespace).DefaultNamespace().
+		FilenameParam(enforceNamespace, cmdutil.GetFlagStringSlice(cmd, "filename")...).
 		ResourceTypeOrNameArgs(false, args...).
 		Flatten().
 		Do()
@@ -98,16 +105,13 @@ func RunScale(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []stri
 	if err != nil {
 		return err
 	}
-	mapping, err := r.ResourceMapping()
-	if err != nil {
-		return err
-	}
 
 	infos, err := r.Infos()
 	if err != nil {
 		return err
 	}
-
+	info := infos[0]
+	mapping := info.ResourceMapping()
 	scaler, err := f.Scaler(mapping)
 	if err != nil {
 		return err