kubectl delete command: adding labelSelector

Add a Visitor pattern on top of ResourcesFromArgs

Allows ResourcesFromArgs to return an opaque list of items and have client
commands react to them.

Change request.go to return apiserver errors for arbitrary status codes to
better respond to generic actions that don't make sense (kubectl delete operations foo)

pkg/kubectl/cmd/delete.go

@@ -20,15 +20,17 @@ import (
 	"fmt"
 	"io"
 
-	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubectl"
+	"github.com/golang/glog"
 	"github.com/spf13/cobra"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubectl"
 )
 
 func (f *Factory) NewCmdDelete(out io.Writer) *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "delete ([-f filename] | (<resource> <id>))",
+		Use:   "delete ([-f filename] | (<resource> [(<id> | -l <label>)]",
 		Short: "Delete a resource by filename, stdin or resource and id",
-		Long: `Delete a resource by filename, stdin or resource and id.
+		Long: `Delete a resource by filename, stdin, resource and id or by resources and label selector.
 
 JSON and YAML formats are accepted.
 
@@ -46,21 +48,31 @@ Examples:
   $ cat pod.json | kubectl delete -f -
   <delete a pod based on the type and id in the json passed into stdin>
 
+  $ kubectl delete pods,services -l name=myLabel
+  <delete pods and services with label name=myLabel>
+
   $ kubectl delete pod 1234-56-7890-234234-456456
   <delete a pod with ID 1234-56-7890-234234-456456>`,
 		Run: func(cmd *cobra.Command, args []string) {
 			filename := GetFlagString(cmd, "filename")
 			schema, err := f.Validator(cmd)
 			checkErr(err)
-			mapping, namespace, name := ResourceFromArgsOrFile(cmd, args, filename, f.Typer, f.Mapper, schema)
-			client, err := f.Client(cmd, mapping)
-			checkErr(err)
-
-			err = kubectl.NewRESTHelper(client, mapping).Delete(namespace, name)
-			checkErr(err)
-			fmt.Fprintf(out, "%s\n", name)
+			selector := GetFlagString(cmd, "selector")
+			found := 0
+			ResourcesFromArgsOrFile(cmd, args, filename, selector, f.Typer, f.Mapper, f.Client, schema).Visit(func(r *ResourceInfo) error {
+				found++
+				if err := kubectl.NewRESTHelper(r.Client, r.Mapping).Delete(r.Namespace, r.Name); err != nil {
+					return err
+				}
+				fmt.Fprintf(out, "%s\n", r.Name)
+				return nil
+			})
+			if found == 0 {
+				glog.V(2).Infof("No resource(s) found")
+			}
 		},
 	}
 	cmd.Flags().StringP("filename", "f", "", "Filename or URL to file to use to delete the resource")
+	cmd.Flags().StringP("selector", "l", "", "Selector (label query) to filter on")
 	return cmd
 }