Added kubectl create role command.

Added kubectl create role command.

pkg/kubectl/cmd/BUILD

@@ -30,6 +30,7 @@ go_library(
         "create_namespace.go",
         "create_pdb.go",
         "create_quota.go",
+        "create_role.go",
         "create_rolebinding.go",
         "create_secret.go",
         "create_service.go",
@@ -70,6 +71,7 @@ go_library(
         "//pkg/apis/certificates:go_default_library",
         "//pkg/apis/extensions/v1beta1:go_default_library",
         "//pkg/apis/policy:go_default_library",
+        "//pkg/apis/rbac:go_default_library",
         "//pkg/client/clientset_generated/internalclientset:go_default_library",
         "//pkg/client/clientset_generated/internalclientset/typed/core/internalversion:go_default_library",
         "//pkg/client/unversioned:go_default_library",
@@ -143,6 +145,7 @@ go_test(
         "create_deployment_test.go",
         "create_namespace_test.go",
         "create_quota_test.go",
+        "create_role_test.go",
         "create_secret_test.go",
         "create_service_test.go",
         "create_serviceaccount_test.go",
@@ -183,6 +186,7 @@ go_test(
         "//pkg/apis/batch:go_default_library",
         "//pkg/apis/extensions:go_default_library",
         "//pkg/apis/policy:go_default_library",
+        "//pkg/apis/rbac:go_default_library",
         "//pkg/kubectl:go_default_library",
         "//pkg/kubectl/cmd/testing:go_default_library",
         "//pkg/kubectl/cmd/util:go_default_library",

pkg/kubectl/cmd/create.go

@@ -96,6 +96,7 @@ func NewCmdCreate(f cmdutil.Factory, out, errOut io.Writer) *cobra.Command {
 	cmd.AddCommand(NewCmdCreateService(f, out, errOut))
 	cmd.AddCommand(NewCmdCreateDeployment(f, out))
 	cmd.AddCommand(NewCmdCreateClusterRoleBinding(f, out))
+	cmd.AddCommand(NewCmdCreateRole(f, out))
 	cmd.AddCommand(NewCmdCreateRoleBinding(f, out))
 	cmd.AddCommand(NewCmdCreatePodDisruptionBudget(f, out))
 	return cmd

pkg/kubectl/cmd/create_role.go

@@ -0,0 +1,237 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cmd
+
+import (
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/spf13/cobra"
+
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
+	cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
+)
+
+var (
+	roleLong = templates.LongDesc(`
+		Create a role with single rule.`)
+
+	roleExample = templates.Examples(`
+		# Create a Role named "pod-reader" that allows user to perform "get", "watch" and "list" on pods
+		kubectl create role pod-reader --verb=get --verb=list --verb=watch --resource=pods
+
+		# Create a Role named "pod-reader" with ResourceName specified
+		kubectl create role pod-reader --verb=get --verg=list --verb=watch --resource=pods --resource-name=readablepod`)
+
+	// Valid resource verb list for validation.
+	validResourceVerbs = []string{"*", "get", "delete", "list", "create", "update", "patch", "watch", "proxy", "redirect", "deletecollection"}
+
+	// Valid non-resource verb list for validation.
+	validNonResourceVerbs = []string{"get", "post", "put", "delete"}
+)
+
+type CreateRoleOptions struct {
+	Name          string
+	Verbs         []string
+	Resources     []schema.GroupVersionResource
+	ResourceNames []string
+}
+
+// Role is a command to ease creating Roles.
+func NewCmdCreateRole(f cmdutil.Factory, cmdOut io.Writer) *cobra.Command {
+	c := &CreateRoleOptions{}
+	cmd := &cobra.Command{
+		Use:     "role NAME --verb=verb --resource=resource.group [--resource-name=resourcename] [--dry-run]",
+		Short:   roleLong,
+		Long:    roleLong,
+		Example: roleExample,
+		Run: func(cmd *cobra.Command, args []string) {
+			cmdutil.CheckErr(c.Complete(cmd, args))
+			cmdutil.CheckErr(c.Validate(f))
+			cmdutil.CheckErr(c.RunCreateRole(f, cmdOut, cmd, args))
+		},
+	}
+	cmdutil.AddApplyAnnotationFlags(cmd)
+	cmdutil.AddValidateFlags(cmd)
+	cmdutil.AddPrinterFlags(cmd)
+	cmdutil.AddDryRunFlag(cmd)
+	cmd.Flags().StringSliceVar(&c.Verbs, "verb", []string{}, "verb that applies to the resources contained in the rule")
+	cmd.Flags().StringSlice("resource", []string{}, "resource that the rule applies to")
+	cmd.Flags().StringSliceVar(&c.ResourceNames, "resource-name", []string{}, "resource in the white list that the rule applies to")
+
+	return cmd
+}
+
+func (c *CreateRoleOptions) Complete(cmd *cobra.Command, args []string) error {
+	name, err := NameFromCommandArgs(cmd, args)
+	if err != nil {
+		return err
+	}
+	c.Name = name
+
+	// Remove duplicate verbs.
+	verbs := []string{}
+	for _, v := range c.Verbs {
+		// VerbAll respresents all kinds of verbs.
+		if v == "*" {
+			verbs = []string{"*"}
+			break
+		}
+		if !arrayContains(verbs, v) {
+			verbs = append(verbs, v)
+		}
+	}
+	c.Verbs = verbs
+
+	// Support resource.group pattern. If no API Group specified, use "" as core API Group.
+	// e.g. --resource=pods,deployments.extensions
+	resources := cmdutil.GetFlagStringSlice(cmd, "resource")
+	for _, r := range resources {
+		sections := strings.Split(r, ".")
+
+		if len(sections) == 1 {
+			c.Resources = append(c.Resources, schema.GroupVersionResource{Resource: r})
+		} else {
+			c.Resources = append(c.Resources, schema.GroupVersionResource{Resource: sections[0], Group: strings.Join(sections[1:], ".")})
+		}
+	}
+
+	// Remove duplicate resource names.
+	resourceNames := []string{}
+	for _, n := range c.ResourceNames {
+		if !arrayContains(resourceNames, n) {
+			resourceNames = append(resourceNames, n)
+		}
+	}
+	c.ResourceNames = resourceNames
+
+	return nil
+}
+
+func (c *CreateRoleOptions) Validate(f cmdutil.Factory) error {
+	if c.Name == "" {
+		return fmt.Errorf("name must be specified")
+	}
+
+	// validate verbs.
+	if len(c.Verbs) == 0 {
+		return fmt.Errorf("at least one verb must be specified")
+	}
+
+	for _, v := range c.Verbs {
+		if !arrayContains(validResourceVerbs, v) && !arrayContains(validNonResourceVerbs, v) {
+			return fmt.Errorf("invalid verb: '%s'", v)
+		}
+	}
+
+	// validate resources.
+	mapper, _ := f.Object()
+
+	if len(c.Resources) == 0 {
+		return fmt.Errorf("at least one resource must be specified")
+	}
+
+	for _, r := range c.Resources {
+		_, err := mapper.ResourceFor(r)
+		if err != nil {
+			return err
+		}
+	}
+
+	// validate resource names, can not apply resource names to multiple resources.
+	if len(c.ResourceNames) > 0 && len(c.Resources) > 1 {
+		return fmt.Errorf("resource name(s) can not be applied to multiple resources")
+	}
+
+	return nil
+}
+
+func (c *CreateRoleOptions) RunCreateRole(f cmdutil.Factory, cmdOut io.Writer, cmd *cobra.Command, args []string) error {
+	mapper, _ := f.Object()
+	dryRun, outputFormat := cmdutil.GetDryRunFlag(cmd), cmdutil.GetFlagString(cmd, "output")
+
+	// groupResourceMapping is a apigroup-resource map. The key of this map is api group, while the value
+	// is a string array of resources under this api group.
+	// E.g.  groupResourceMapping = {"extensions": ["replicasets", "deployments"], "batch":["jobs"]}
+	groupResourceMapping := map[string][]string{}
+
+	// This loop does the following work:
+	// 1. Constructs groupResourceMapping based on input resources.
+	// 2. Prevents pointing to non-existent resources.
+	// 3. Transfers resource short name to long name. E.g. rs.extensions is transferred to replicasets.extensions
+	for _, r := range c.Resources {
+		resource, err := mapper.ResourceFor(r)
+		if err != nil {
+			return err
+		}
+		if !arrayContains(groupResourceMapping[resource.Group], resource.Resource) {
+			groupResourceMapping[resource.Group] = append(groupResourceMapping[resource.Group], resource.Resource)
+		}
+	}
+
+	role := &rbac.Role{}
+
+	// Create separate rule for each of the api group.
+	rules := []rbac.PolicyRule{}
+	for _, g := range sets.StringKeySet(groupResourceMapping).List() {
+		rule := rbac.PolicyRule{}
+		rule.Verbs = c.Verbs
+		rule.Resources = groupResourceMapping[g]
+		rule.APIGroups = []string{g}
+		rule.ResourceNames = c.ResourceNames
+		rules = append(rules, rule)
+	}
+	role.Name = c.Name
+	role.Rules = rules
+
+	// Create role.
+	namespace, _, err := f.DefaultNamespace()
+	if err != nil {
+		return err
+	}
+
+	if !dryRun {
+		client, err := f.ClientSet()
+		if err != nil {
+			return err
+		}
+		_, err = client.Rbac().Roles(namespace).Create(role)
+		if err != nil {
+			return err
+		}
+	}
+
+	if useShortOutput := outputFormat == "name"; useShortOutput || len(outputFormat) == 0 {
+		cmdutil.PrintSuccess(mapper, useShortOutput, cmdOut, "roles", c.Name, dryRun, "created")
+		return nil
+	}
+
+	return f.PrintObject(cmd, mapper, role, cmdOut)
+}
+
+func arrayContains(s []string, e string) bool {
+	for _, a := range s {
+		if a == e {
+			return true
+		}
+	}
+	return false
+}