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set_subject.go
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/
set_subject.go
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/*
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 set
import (
"fmt"
"io"
"strings"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"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"
"k8s.io/kubernetes/pkg/kubectl/resource"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
)
var (
subject_long = templates.LongDesc(`
Update User, Group or ServiceAccount in a RoleBinding/ClusterRoleBinding.`)
subject_example = templates.Examples(`
# Update a ClusterRoleBinding for serviceaccount1
kubectl set subject clusterrolebinding admin --serviceaccount=namespace:serviceaccount1
# Update a RoleBinding for user1, user2, and group1
kubectl set subject rolebinding admin --user=user1 --user=user2 --group=group1
# Print the result (in yaml format) of updating rolebinding subjects from a local, without hitting the server
kubectl create rolebinding admin --role=admin --user=admin -o yaml --dry-run | kubectl set subject --local -f - --user=foo -o yaml`)
)
type updateSubjects func(existings []rbac.Subject, targets []rbac.Subject) (bool, []rbac.Subject)
// SubjectOptions is the start of the data required to perform the operation. As new fields are added, add them here instead of
// referencing the cmd.Flags
type SubjectOptions struct {
resource.FilenameOptions
Mapper meta.RESTMapper
Typer runtime.ObjectTyper
Infos []*resource.Info
Encoder runtime.Encoder
Out io.Writer
Err io.Writer
Selector string
ContainerSelector string
Output string
All bool
DryRun bool
Local bool
Users []string
Groups []string
ServiceAccounts []string
PrintObject func(mapper meta.RESTMapper, obj runtime.Object, out io.Writer) error
}
func NewCmdSubject(f cmdutil.Factory, out io.Writer, errOut io.Writer) *cobra.Command {
options := &SubjectOptions{
Out: out,
Err: errOut,
}
cmd := &cobra.Command{
Use: "subject (-f FILENAME | TYPE NAME) [--user=username] [--group=groupname] [--serviceaccount=namespace:serviceaccountname] [--dry-run]",
DisableFlagsInUseLine: true,
Short: i18n.T("Update User, Group or ServiceAccount in a RoleBinding/ClusterRoleBinding"),
Long: subject_long,
Example: subject_example,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(options.Complete(f, cmd, args))
cmdutil.CheckErr(options.Validate())
cmdutil.CheckErr(options.Run(f, addSubjects))
},
}
cmdutil.AddPrinterFlags(cmd)
usage := "the resource to update the subjects"
cmdutil.AddFilenameOptionFlags(cmd, &options.FilenameOptions, usage)
cmd.Flags().BoolVar(&options.All, "all", options.All, "Select all resources, including uninitialized ones, in the namespace of the specified resource types")
cmd.Flags().StringVarP(&options.Selector, "selector", "l", "", "Selector (label query) to filter on, not including uninitialized ones, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)")
cmd.Flags().BoolVar(&options.Local, "local", options.Local, "If true, set subject will NOT contact api-server but run locally.")
cmdutil.AddDryRunFlag(cmd)
cmd.Flags().StringArrayVar(&options.Users, "user", []string{}, "Usernames to bind to the role")
cmd.Flags().StringArrayVar(&options.Groups, "group", []string{}, "Groups to bind to the role")
cmd.Flags().StringArrayVar(&options.ServiceAccounts, "serviceaccount", []string{}, "Service accounts to bind to the role")
cmdutil.AddIncludeUninitializedFlag(cmd)
return cmd
}
func (o *SubjectOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
o.Mapper, o.Typer = f.Object()
o.Encoder = f.JSONEncoder()
o.Output = cmdutil.GetFlagString(cmd, "output")
o.DryRun = cmdutil.GetDryRunFlag(cmd)
o.PrintObject = func(mapper meta.RESTMapper, obj runtime.Object, out io.Writer) error {
return f.PrintObject(cmd, o.Local, mapper, obj, out)
}
cmdNamespace, enforceNamespace, err := f.DefaultNamespace()
if err != nil {
return err
}
includeUninitialized := cmdutil.ShouldIncludeUninitialized(cmd, false)
builder := f.NewBuilder().
Internal().
LocalParam(o.Local).
ContinueOnError().
NamespaceParam(cmdNamespace).DefaultNamespace().
FilenameParam(enforceNamespace, &o.FilenameOptions).
IncludeUninitialized(includeUninitialized).
Flatten()
if o.Local {
// if a --local flag was provided, and a resource was specified in the form
// <resource>/<name>, fail immediately as --local cannot query the api server
// for the specified resource.
if len(args) > 0 {
return resource.LocalResourceError
}
} else {
builder = builder.
LabelSelectorParam(o.Selector).
ResourceTypeOrNameArgs(o.All, args...).
Latest()
}
o.Infos, err = builder.Do().Infos()
if err != nil {
return err
}
return nil
}
func (o *SubjectOptions) Validate() error {
if o.All && len(o.Selector) > 0 {
return fmt.Errorf("cannot set --all and --selector at the same time")
}
if len(o.Users) == 0 && len(o.Groups) == 0 && len(o.ServiceAccounts) == 0 {
return fmt.Errorf("you must specify at least one value of user, group or serviceaccount")
}
for _, sa := range o.ServiceAccounts {
tokens := strings.Split(sa, ":")
if len(tokens) != 2 || tokens[1] == "" {
return fmt.Errorf("serviceaccount must be <namespace>:<name>")
}
for _, info := range o.Infos {
_, ok := info.Object.(*rbac.ClusterRoleBinding)
if ok && tokens[0] == "" {
return fmt.Errorf("serviceaccount must be <namespace>:<name>, namespace must be specified")
}
}
}
return nil
}
func (o *SubjectOptions) Run(f cmdutil.Factory, fn updateSubjects) error {
var err error
patches := CalculatePatches(o.Infos, o.Encoder, func(info *resource.Info) ([]byte, error) {
subjects := []rbac.Subject{}
for _, user := range sets.NewString(o.Users...).List() {
subject := rbac.Subject{
Kind: rbac.UserKind,
APIGroup: rbac.GroupName,
Name: user,
}
subjects = append(subjects, subject)
}
for _, group := range sets.NewString(o.Groups...).List() {
subject := rbac.Subject{
Kind: rbac.GroupKind,
APIGroup: rbac.GroupName,
Name: group,
}
subjects = append(subjects, subject)
}
for _, sa := range sets.NewString(o.ServiceAccounts...).List() {
tokens := strings.Split(sa, ":")
namespace := tokens[0]
name := tokens[1]
if len(namespace) == 0 {
namespace, _, err = f.DefaultNamespace()
if err != nil {
return nil, err
}
}
subject := rbac.Subject{
Kind: rbac.ServiceAccountKind,
Namespace: namespace,
Name: name,
}
subjects = append(subjects, subject)
}
transformed, err := updateSubjectForObject(info.Object, subjects, fn)
if transformed && err == nil {
// TODO: switch UpdatePodSpecForObject to work on v1.PodSpec
return runtime.Encode(o.Encoder, info.AsVersioned())
}
return nil, err
})
allErrs := []error{}
for _, patch := range patches {
info := patch.Info
if patch.Err != nil {
allErrs = append(allErrs, fmt.Errorf("error: %s/%s %v\n", info.Mapping.Resource, info.Name, patch.Err))
continue
}
//no changes
if string(patch.Patch) == "{}" || len(patch.Patch) == 0 {
allErrs = append(allErrs, fmt.Errorf("info: %s %q was not changed\n", info.Mapping.Resource, info.Name))
continue
}
if o.Local || o.DryRun {
if err := o.PrintObject(o.Mapper, info.Object, o.Out); err != nil {
return err
}
continue
}
obj, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, types.StrategicMergePatchType, patch.Patch)
if err != nil {
allErrs = append(allErrs, fmt.Errorf("failed to patch subjects to rolebinding: %v\n", err))
continue
}
info.Refresh(obj, true)
shortOutput := o.Output == "name"
if len(o.Output) > 0 && !shortOutput {
return o.PrintObject(o.Mapper, info.AsVersioned(), o.Out)
}
f.PrintSuccess(shortOutput, o.Out, info.Mapping.Resource, info.Name, false, "subjects updated")
}
return utilerrors.NewAggregate(allErrs)
}
//Note: the obj mutates in the function
func updateSubjectForObject(obj runtime.Object, subjects []rbac.Subject, fn updateSubjects) (bool, error) {
switch t := obj.(type) {
case *rbac.RoleBinding:
transformed, result := fn(t.Subjects, subjects)
t.Subjects = result
return transformed, nil
case *rbac.ClusterRoleBinding:
transformed, result := fn(t.Subjects, subjects)
t.Subjects = result
return transformed, nil
default:
return false, fmt.Errorf("setting subjects is only supported for RoleBinding/ClusterRoleBinding")
}
}
func addSubjects(existings []rbac.Subject, targets []rbac.Subject) (bool, []rbac.Subject) {
transformed := false
updated := existings
for _, item := range targets {
if !contain(existings, item) {
updated = append(updated, item)
transformed = true
}
}
return transformed, updated
}
func contain(slice []rbac.Subject, item rbac.Subject) bool {
for _, v := range slice {
if v == item {
return true
}
}
return false
}