vendor/k8s.io/kubernetes/pkg/kubectl/cmd/set/set_env.go - cloudstack-kubernetes-provider - Git at Google

 /*
 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 (
 	"errors"
 	"fmt"
 	"regexp"
 	"sort"
 	"strings"

 	"github.com/spf13/cobra"

 	"k8s.io/api/core/v1"
 	meta "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/cli-runtime/pkg/genericclioptions"
 	"k8s.io/cli-runtime/pkg/genericclioptions/printers"
 	"k8s.io/cli-runtime/pkg/genericclioptions/resource"
 	"k8s.io/client-go/kubernetes"
 	envutil "k8s.io/kubernetes/pkg/kubectl/cmd/set/env"
 	cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
 	"k8s.io/kubernetes/pkg/kubectl/polymorphichelpers"
 	"k8s.io/kubernetes/pkg/kubectl/scheme"
 	"k8s.io/kubernetes/pkg/kubectl/util/templates"
 )

 var (
 	validEnvNameRegexp = regexp.MustCompile("[^a-zA-Z0-9_]")
 	envResources       = `
   	pod (po), replicationcontroller (rc), deployment (deploy), daemonset (ds), job, replicaset (rs)`

 	envLong = templates.LongDesc(`
 		Update environment variables on a pod template.

 		List environment variable definitions in one or more pods, pod templates.
 		Add, update, or remove container environment variable definitions in one or
 		more pod templates (within replication controllers or deployment configurations).
 		View or modify the environment variable definitions on all containers in the
 		specified pods or pod templates, or just those that match a wildcard.

 		If "--env -" is passed, environment variables can be read from STDIN using the standard env
 		syntax.

 		Possible resources include (case insensitive):
 		` + envResources)

 	envExample = templates.Examples(`
           # Update deployment 'registry' with a new environment variable
 	  kubectl set env deployment/registry STORAGE_DIR=/local

 	  # List the environment variables defined on a deployments 'sample-build'
 	  kubectl set env deployment/sample-build --list

 	  # List the environment variables defined on all pods
 	  kubectl set env pods --all --list

 	  # Output modified deployment in YAML, and does not alter the object on the server
 	  kubectl set env deployment/sample-build STORAGE_DIR=/data -o yaml

 	  # Update all containers in all replication controllers in the project to have ENV=prod
 	  kubectl set env rc --all ENV=prod

 	  # Import environment from a secret
 	  kubectl set env --from=secret/mysecret deployment/myapp

 	  # Import environment from a config map with a prefix
 	  kubectl set env --from=configmap/myconfigmap --prefix=MYSQL_ deployment/myapp

           # Import specific keys from a config map
           kubectl set env --keys=my-example-key --from=configmap/myconfigmap deployment/myapp

 	  # Remove the environment variable ENV from container 'c1' in all deployment configs
 	  kubectl set env deployments --all --containers="c1" ENV-

 	  # Remove the environment variable ENV from a deployment definition on disk and
 	  # update the deployment config on the server
 	  kubectl set env -f deploy.json ENV-

 	  # Set some of the local shell environment into a deployment config on the server
 	  env | grep RAILS_ | kubectl set env -e - deployment/registry`)
 )

 type EnvOptions struct {
 	PrintFlags *genericclioptions.PrintFlags
 	resource.FilenameOptions

 	EnvParams         []string
 	All               bool
 	Resolve           bool
 	List              bool
 	Local             bool
 	Overwrite         bool
 	ContainerSelector string
 	Selector          string
 	From              string
 	Prefix            string
 	Keys              []string

 	PrintObj printers.ResourcePrinterFunc

 	envArgs                []string
 	resources              []string
 	output                 string
 	dryRun                 bool
 	builder                func() *resource.Builder
 	updatePodSpecForObject polymorphichelpers.UpdatePodSpecForObjectFunc
 	namespace              string
 	enforceNamespace       bool
 	clientset              *kubernetes.Clientset

 	genericclioptions.IOStreams
 }

 // NewEnvOptions returns an EnvOptions indicating all containers in the selected
 // pod templates are selected by default and allowing environment to be overwritten
 func NewEnvOptions(streams genericclioptions.IOStreams) *EnvOptions {
 	return &EnvOptions{
 		PrintFlags: genericclioptions.NewPrintFlags("env updated").WithTypeSetter(scheme.Scheme),

 		ContainerSelector: "*",
 		Overwrite:         true,

 		IOStreams: streams,
 	}
 }

 // NewCmdEnv implements the OpenShift cli env command
 func NewCmdEnv(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
 	o := NewEnvOptions(streams)
 	cmd := &cobra.Command{
 		Use:                   "env RESOURCE/NAME KEY_1=VAL_1 ... KEY_N=VAL_N",
 		DisableFlagsInUseLine: true,
 		Short:                 "Update environment variables on a pod template",
 		Long:                  envLong,
 		Example:               fmt.Sprintf(envExample),
 		Run: func(cmd *cobra.Command, args []string) {
 			cmdutil.CheckErr(o.Complete(f, cmd, args))
 			cmdutil.CheckErr(o.Validate())
 			cmdutil.CheckErr(o.RunEnv())
 		},
 	}
 	usage := "the resource to update the env"
 	cmdutil.AddFilenameOptionFlags(cmd, &o.FilenameOptions, usage)
 	cmd.Flags().StringVarP(&o.ContainerSelector, "containers", "c", o.ContainerSelector, "The names of containers in the selected pod templates to change - may use wildcards")
 	cmd.Flags().StringVarP(&o.From, "from", "", "", "The name of a resource from which to inject environment variables")
 	cmd.Flags().StringVarP(&o.Prefix, "prefix", "", "", "Prefix to append to variable names")
 	cmd.Flags().StringArrayVarP(&o.EnvParams, "env", "e", o.EnvParams, "Specify a key-value pair for an environment variable to set into each container.")
 	cmd.Flags().StringSliceVarP(&o.Keys, "keys", "", o.Keys, "Comma-separated list of keys to import from specified resource")
 	cmd.Flags().BoolVar(&o.List, "list", o.List, "If true, display the environment and any changes in the standard format. this flag will removed when we have kubectl view env.")
 	cmd.Flags().BoolVar(&o.Resolve, "resolve", o.Resolve, "If true, show secret or configmap references when listing variables")
 	cmd.Flags().StringVarP(&o.Selector, "selector", "l", o.Selector, "Selector (label query) to filter on")
 	cmd.Flags().BoolVar(&o.Local, "local", o.Local, "If true, set env will NOT contact api-server but run locally.")
 	cmd.Flags().BoolVar(&o.All, "all", o.All, "If true, select all resources in the namespace of the specified resource types")
 	cmd.Flags().BoolVar(&o.Overwrite, "overwrite", o.Overwrite, "If true, allow environment to be overwritten, otherwise reject updates that overwrite existing environment.")

 	o.PrintFlags.AddFlags(cmd)

 	cmdutil.AddDryRunFlag(cmd)
 	return cmd
 }

 func validateNoOverwrites(existing []v1.EnvVar, env []v1.EnvVar) error {
 	for _, e := range env {
 		if current, exists := findEnv(existing, e.Name); exists && current.Value != e.Value {
 			return fmt.Errorf("'%s' already has a value (%s), and --overwrite is false", current.Name, current.Value)
 		}
 	}
 	return nil
 }

 func keyToEnvName(key string) string {
 	return strings.ToUpper(validEnvNameRegexp.ReplaceAllString(key, "_"))
 }

 func contains(key string, keyList []string) bool {
 	if len(keyList) == 0 {
 		return true
 	}

 	for _, k := range keyList {
 		if k == key {
 			return true
 		}
 	}
 	return false
 }

 func (o *EnvOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
 	if o.All && len(o.Selector) > 0 {
 		return fmt.Errorf("cannot set --all and --selector at the same time")
 	}
 	ok := false
 	o.resources, o.envArgs, ok = envutil.SplitEnvironmentFromResources(args)
 	if !ok {
 		return fmt.Errorf("all resources must be specified before environment changes: %s", strings.Join(args, " "))
 	}

 	o.updatePodSpecForObject = polymorphichelpers.UpdatePodSpecForObjectFn
 	o.output = cmdutil.GetFlagString(cmd, "output")
 	o.dryRun = cmdutil.GetDryRunFlag(cmd)

 	if o.dryRun {
 		// TODO(juanvallejo): This can be cleaned up even further by creating
 		// a PrintFlags struct that binds the --dry-run flag, and whose
 		// ToPrinter method returns a printer that understands how to print
 		// this success message.
 		o.PrintFlags.Complete("%s (dry run)")
 	}
 	printer, err := o.PrintFlags.ToPrinter()
 	if err != nil {
 		return err
 	}
 	o.PrintObj = printer.PrintObj

 	o.clientset, err = f.KubernetesClientSet()
 	if err != nil {
 		return err
 	}
 	o.namespace, o.enforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()
 	if err != nil {
 		return err
 	}
 	o.builder = f.NewBuilder

 	return nil
 }

 func (o *EnvOptions) Validate() error {
 	if len(o.Filenames) == 0 && len(o.resources) < 1 {
 		return fmt.Errorf("one or more resources must be specified as <resource> <name> or <resource>/<name>")
 	}
 	if o.List && len(o.output) > 0 {
 		return fmt.Errorf("--list and --output may not be specified together")
 	}
 	if len(o.Keys) > 0 && len(o.From) == 0 {
 		return fmt.Errorf("when specifying --keys, a configmap or secret must be provided with --from")
 	}
 	return nil
 }

 // RunEnv contains all the necessary functionality for the OpenShift cli env command
 func (o *EnvOptions) RunEnv() error {
 	env, remove, err := envutil.ParseEnv(append(o.EnvParams, o.envArgs...), o.In)
 	if err != nil {
 		return err
 	}

 	if len(o.From) != 0 {
 		b := o.builder().
 			WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
 			LocalParam(o.Local).
 			ContinueOnError().
 			NamespaceParam(o.namespace).DefaultNamespace().
 			FilenameParam(o.enforceNamespace, &o.FilenameOptions).
 			Flatten()

 		if !o.Local {
 			b = b.
 				LabelSelectorParam(o.Selector).
 				ResourceTypeOrNameArgs(o.All, o.From).
 				Latest()
 		}

 		infos, err := b.Do().Infos()
 		if err != nil {
 			return err
 		}

 		for _, info := range infos {
 			switch from := info.Object.(type) {
 			case *v1.Secret:
 				for key := range from.Data {
 					if contains(key, o.Keys) {
 						envVar := v1.EnvVar{
 							Name: keyToEnvName(key),
 							ValueFrom: &v1.EnvVarSource{
 								SecretKeyRef: &v1.SecretKeySelector{
 									LocalObjectReference: v1.LocalObjectReference{
 										Name: from.Name,
 									},
 									Key: key,
 								},
 							},
 						}
 						env = append(env, envVar)
 					}
 				}
 			case *v1.ConfigMap:
 				for key := range from.Data {
 					if contains(key, o.Keys) {
 						envVar := v1.EnvVar{
 							Name: keyToEnvName(key),
 							ValueFrom: &v1.EnvVarSource{
 								ConfigMapKeyRef: &v1.ConfigMapKeySelector{
 									LocalObjectReference: v1.LocalObjectReference{
 										Name: from.Name,
 									},
 									Key: key,
 								},
 							},
 						}
 						env = append(env, envVar)
 					}
 				}
 			default:
 				return fmt.Errorf("unsupported resource specified in --from")
 			}
 		}
 	}

 	if len(o.Prefix) != 0 {
 		for i := range env {
 			env[i].Name = fmt.Sprintf("%s%s", o.Prefix, env[i].Name)
 		}
 	}

 	b := o.builder().
 		WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
 		LocalParam(o.Local).
 		ContinueOnError().
 		NamespaceParam(o.namespace).DefaultNamespace().
 		FilenameParam(o.enforceNamespace, &o.FilenameOptions).
 		Flatten()

 	if !o.Local {
 		b.LabelSelectorParam(o.Selector).
 			ResourceTypeOrNameArgs(o.All, o.resources...).
 			Latest()
 	}

 	infos, err := b.Do().Infos()
 	if err != nil {
 		return err
 	}
 	patches := CalculatePatches(infos, scheme.DefaultJSONEncoder(), func(obj runtime.Object) ([]byte, error) {
 		_, err := o.updatePodSpecForObject(obj, func(spec *v1.PodSpec) error {
 			resolutionErrorsEncountered := false
 			containers, _ := selectContainers(spec.Containers, o.ContainerSelector)
 			objName, err := meta.NewAccessor().Name(obj)
 			if err != nil {
 				return err
 			}

 			gvks, _, err := scheme.Scheme.ObjectKinds(obj)
 			if err != nil {
 				return err
 			}
 			objKind := obj.GetObjectKind().GroupVersionKind().Kind
 			if len(objKind) == 0 {
 				for _, gvk := range gvks {
 					if len(gvk.Kind) == 0 {
 						continue
 					}
 					if len(gvk.Version) == 0 || gvk.Version == runtime.APIVersionInternal {
 						continue
 					}

 					objKind = gvk.Kind
 					break
 				}
 			}

 			if len(containers) == 0 {
 				if gvks, _, err := scheme.Scheme.ObjectKinds(obj); err == nil {
 					objKind := obj.GetObjectKind().GroupVersionKind().Kind
 					if len(objKind) == 0 {
 						for _, gvk := range gvks {
 							if len(gvk.Kind) == 0 {
 								continue
 							}
 							if len(gvk.Version) == 0 || gvk.Version == runtime.APIVersionInternal {
 								continue
 							}

 							objKind = gvk.Kind
 							break
 						}
 					}

 					fmt.Fprintf(o.ErrOut, "warning: %s/%s does not have any containers matching %q\n", objKind, objName, o.ContainerSelector)
 				}
 				return nil
 			}
 			for _, c := range containers {
 				if !o.Overwrite {
 					if err := validateNoOverwrites(c.Env, env); err != nil {
 						return err
 					}
 				}

 				c.Env = updateEnv(c.Env, env, remove)
 				if o.List {
 					resolveErrors := map[string][]string{}
 					store := envutil.NewResourceStore()

 					fmt.Fprintf(o.Out, "# %s %s, container %s\n", objKind, objName, c.Name)
 					for _, env := range c.Env {
 						// Print the simple value
 						if env.ValueFrom == nil {
 							fmt.Fprintf(o.Out, "%s=%s\n", env.Name, env.Value)
 							continue
 						}

 						// Print the reference version
 						if !o.Resolve {
 							fmt.Fprintf(o.Out, "# %s from %s\n", env.Name, envutil.GetEnvVarRefString(env.ValueFrom))
 							continue
 						}

 						value, err := envutil.GetEnvVarRefValue(o.clientset, o.namespace, store, env.ValueFrom, obj, c)
 						// Print the resolved value
 						if err == nil {
 							fmt.Fprintf(o.Out, "%s=%s\n", env.Name, value)
 							continue
 						}

 						// Print the reference version and save the resolve error
 						fmt.Fprintf(o.Out, "# %s from %s\n", env.Name, envutil.GetEnvVarRefString(env.ValueFrom))
 						errString := err.Error()
 						resolveErrors[errString] = append(resolveErrors[errString], env.Name)
 						resolutionErrorsEncountered = true
 					}

 					// Print any resolution errors
 					errs := []string{}
 					for err, vars := range resolveErrors {
 						sort.Strings(vars)
 						errs = append(errs, fmt.Sprintf("error retrieving reference for %s: %v", strings.Join(vars, ", "), err))
 					}
 					sort.Strings(errs)
 					for _, err := range errs {
 						fmt.Fprintln(o.ErrOut, err)
 					}
 				}
 			}
 			if resolutionErrorsEncountered {
 				return errors.New("failed to retrieve valueFrom references")
 			}
 			return nil
 		})

 		if err == nil {
 			return runtime.Encode(scheme.DefaultJSONEncoder(), obj)
 		}
 		return nil, err
 	})

 	if o.List {
 		return nil
 	}

 	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 {
 			continue
 		}

 		if o.Local || o.dryRun {
 			if err := o.PrintObj(info.Object, o.Out); err != nil {
 				allErrs = append(allErrs, err)
 			}
 			continue
 		}

 		actual, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, types.StrategicMergePatchType, patch.Patch, nil)
 		if err != nil {
 			allErrs = append(allErrs, fmt.Errorf("failed to patch env update to pod template: %v\n", err))
 			continue
 		}

 		// make sure arguments to set or replace environment variables are set
 		// before returning a successful message
 		if len(env) == 0 && len(o.envArgs) == 0 {
 			return fmt.Errorf("at least one environment variable must be provided")
 		}

 		if err := o.PrintObj(actual, o.Out); err != nil {
 			allErrs = append(allErrs, err)
 		}
 	}
 	return utilerrors.NewAggregate(allErrs)
 }
	/*
	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 (
	"errors"
	"fmt"
	"regexp"
	"sort"
	"strings"

	"github.com/spf13/cobra"

	"k8s.io/api/core/v1"
	meta "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/cli-runtime/pkg/genericclioptions"
	"k8s.io/cli-runtime/pkg/genericclioptions/printers"
	"k8s.io/cli-runtime/pkg/genericclioptions/resource"
	"k8s.io/client-go/kubernetes"
	envutil "k8s.io/kubernetes/pkg/kubectl/cmd/set/env"
	cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
	"k8s.io/kubernetes/pkg/kubectl/polymorphichelpers"
	"k8s.io/kubernetes/pkg/kubectl/scheme"
	"k8s.io/kubernetes/pkg/kubectl/util/templates"
	)

	var (
	validEnvNameRegexp = regexp.MustCompile("[^a-zA-Z0-9_]")
	envResources = `
	pod (po), replicationcontroller (rc), deployment (deploy), daemonset (ds), job, replicaset (rs)`

	envLong = templates.LongDesc(`
	Update environment variables on a pod template.

	List environment variable definitions in one or more pods, pod templates.
	Add, update, or remove container environment variable definitions in one or
	more pod templates (within replication controllers or deployment configurations).
	View or modify the environment variable definitions on all containers in the
	specified pods or pod templates, or just those that match a wildcard.

	If "--env -" is passed, environment variables can be read from STDIN using the standard env
	syntax.

	Possible resources include (case insensitive):
	` + envResources)

	envExample = templates.Examples(`
	# Update deployment 'registry' with a new environment variable
	kubectl set env deployment/registry STORAGE_DIR=/local

	# List the environment variables defined on a deployments 'sample-build'
	kubectl set env deployment/sample-build --list

	# List the environment variables defined on all pods
	kubectl set env pods --all --list

	# Output modified deployment in YAML, and does not alter the object on the server
	kubectl set env deployment/sample-build STORAGE_DIR=/data -o yaml

	# Update all containers in all replication controllers in the project to have ENV=prod
	kubectl set env rc --all ENV=prod

	# Import environment from a secret
	kubectl set env --from=secret/mysecret deployment/myapp

	# Import environment from a config map with a prefix
	kubectl set env --from=configmap/myconfigmap --prefix=MYSQL_ deployment/myapp

	# Import specific keys from a config map
	kubectl set env --keys=my-example-key --from=configmap/myconfigmap deployment/myapp

	# Remove the environment variable ENV from container 'c1' in all deployment configs
	kubectl set env deployments --all --containers="c1" ENV-

	# Remove the environment variable ENV from a deployment definition on disk and
	# update the deployment config on the server
	kubectl set env -f deploy.json ENV-

	# Set some of the local shell environment into a deployment config on the server
	env \| grep RAILS_ \| kubectl set env -e - deployment/registry`)
	)

	type EnvOptions struct {
	PrintFlags *genericclioptions.PrintFlags
	resource.FilenameOptions

	EnvParams []string
	All bool
	Resolve bool
	List bool
	Local bool
	Overwrite bool
	ContainerSelector string
	Selector string
	From string
	Prefix string
	Keys []string

	PrintObj printers.ResourcePrinterFunc

	envArgs []string
	resources []string
	output string
	dryRun bool
	builder func() *resource.Builder
	updatePodSpecForObject polymorphichelpers.UpdatePodSpecForObjectFunc
	namespace string
	enforceNamespace bool
	clientset *kubernetes.Clientset

	genericclioptions.IOStreams
	}

	// NewEnvOptions returns an EnvOptions indicating all containers in the selected
	// pod templates are selected by default and allowing environment to be overwritten
	func NewEnvOptions(streams genericclioptions.IOStreams) *EnvOptions {
	return &EnvOptions{
	PrintFlags: genericclioptions.NewPrintFlags("env updated").WithTypeSetter(scheme.Scheme),

	ContainerSelector: "*",
	Overwrite: true,

	IOStreams: streams,
	}
	}

	// NewCmdEnv implements the OpenShift cli env command
	func NewCmdEnv(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
	o := NewEnvOptions(streams)
	cmd := &cobra.Command{
	Use: "env RESOURCE/NAME KEY_1=VAL_1 ... KEY_N=VAL_N",
	DisableFlagsInUseLine: true,
	Short: "Update environment variables on a pod template",
	Long: envLong,
	Example: fmt.Sprintf(envExample),
	Run: func(cmd *cobra.Command, args []string) {
	cmdutil.CheckErr(o.Complete(f, cmd, args))
	cmdutil.CheckErr(o.Validate())
	cmdutil.CheckErr(o.RunEnv())
	},
	}
	usage := "the resource to update the env"
	cmdutil.AddFilenameOptionFlags(cmd, &o.FilenameOptions, usage)
	cmd.Flags().StringVarP(&o.ContainerSelector, "containers", "c", o.ContainerSelector, "The names of containers in the selected pod templates to change - may use wildcards")
	cmd.Flags().StringVarP(&o.From, "from", "", "", "The name of a resource from which to inject environment variables")
	cmd.Flags().StringVarP(&o.Prefix, "prefix", "", "", "Prefix to append to variable names")
	cmd.Flags().StringArrayVarP(&o.EnvParams, "env", "e", o.EnvParams, "Specify a key-value pair for an environment variable to set into each container.")
	cmd.Flags().StringSliceVarP(&o.Keys, "keys", "", o.Keys, "Comma-separated list of keys to import from specified resource")
	cmd.Flags().BoolVar(&o.List, "list", o.List, "If true, display the environment and any changes in the standard format. this flag will removed when we have kubectl view env.")
	cmd.Flags().BoolVar(&o.Resolve, "resolve", o.Resolve, "If true, show secret or configmap references when listing variables")
	cmd.Flags().StringVarP(&o.Selector, "selector", "l", o.Selector, "Selector (label query) to filter on")
	cmd.Flags().BoolVar(&o.Local, "local", o.Local, "If true, set env will NOT contact api-server but run locally.")
	cmd.Flags().BoolVar(&o.All, "all", o.All, "If true, select all resources in the namespace of the specified resource types")
	cmd.Flags().BoolVar(&o.Overwrite, "overwrite", o.Overwrite, "If true, allow environment to be overwritten, otherwise reject updates that overwrite existing environment.")

	o.PrintFlags.AddFlags(cmd)

	cmdutil.AddDryRunFlag(cmd)
	return cmd
	}

	func validateNoOverwrites(existing []v1.EnvVar, env []v1.EnvVar) error {
	for _, e := range env {
	if current, exists := findEnv(existing, e.Name); exists && current.Value != e.Value {
	return fmt.Errorf("'%s' already has a value (%s), and --overwrite is false", current.Name, current.Value)
	}
	}
	return nil
	}

	func keyToEnvName(key string) string {
	return strings.ToUpper(validEnvNameRegexp.ReplaceAllString(key, "_"))
	}

	func contains(key string, keyList []string) bool {
	if len(keyList) == 0 {
	return true
	}

	for _, k := range keyList {
	if k == key {
	return true
	}
	}
	return false
	}

	func (o EnvOptions) Complete(f cmdutil.Factory, cmd cobra.Command, args []string) error {
	if o.All && len(o.Selector) > 0 {
	return fmt.Errorf("cannot set --all and --selector at the same time")
	}
	ok := false
	o.resources, o.envArgs, ok = envutil.SplitEnvironmentFromResources(args)
	if !ok {
	return fmt.Errorf("all resources must be specified before environment changes: %s", strings.Join(args, " "))
	}

	o.updatePodSpecForObject = polymorphichelpers.UpdatePodSpecForObjectFn
	o.output = cmdutil.GetFlagString(cmd, "output")
	o.dryRun = cmdutil.GetDryRunFlag(cmd)

	if o.dryRun {
	// TODO(juanvallejo): This can be cleaned up even further by creating
	// a PrintFlags struct that binds the --dry-run flag, and whose
	// ToPrinter method returns a printer that understands how to print
	// this success message.
	o.PrintFlags.Complete("%s (dry run)")
	}
	printer, err := o.PrintFlags.ToPrinter()
	if err != nil {
	return err
	}
	o.PrintObj = printer.PrintObj

	o.clientset, err = f.KubernetesClientSet()
	if err != nil {
	return err
	}
	o.namespace, o.enforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()
	if err != nil {
	return err
	}
	o.builder = f.NewBuilder

	return nil
	}

	func (o *EnvOptions) Validate() error {
	if len(o.Filenames) == 0 && len(o.resources) < 1 {
	return fmt.Errorf("one or more resources must be specified as <resource> <name> or <resource>/<name>")
	}
	if o.List && len(o.output) > 0 {
	return fmt.Errorf("--list and --output may not be specified together")
	}
	if len(o.Keys) > 0 && len(o.From) == 0 {
	return fmt.Errorf("when specifying --keys, a configmap or secret must be provided with --from")
	}
	return nil
	}

	// RunEnv contains all the necessary functionality for the OpenShift cli env command
	func (o *EnvOptions) RunEnv() error {
	env, remove, err := envutil.ParseEnv(append(o.EnvParams, o.envArgs...), o.In)
	if err != nil {
	return err
	}

	if len(o.From) != 0 {
	b := o.builder().
	WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
	LocalParam(o.Local).
	ContinueOnError().
	NamespaceParam(o.namespace).DefaultNamespace().
	FilenameParam(o.enforceNamespace, &o.FilenameOptions).
	Flatten()

	if !o.Local {
	b = b.
	LabelSelectorParam(o.Selector).
	ResourceTypeOrNameArgs(o.All, o.From).
	Latest()
	}

	infos, err := b.Do().Infos()
	if err != nil {
	return err
	}

	for _, info := range infos {
	switch from := info.Object.(type) {
	case *v1.Secret:
	for key := range from.Data {
	if contains(key, o.Keys) {
	envVar := v1.EnvVar{
	Name: keyToEnvName(key),
	ValueFrom: &v1.EnvVarSource{
	SecretKeyRef: &v1.SecretKeySelector{
	LocalObjectReference: v1.LocalObjectReference{
	Name: from.Name,
	},
	Key: key,
	},
	},
	}
	env = append(env, envVar)
	}
	}
	case *v1.ConfigMap:
	for key := range from.Data {
	if contains(key, o.Keys) {
	envVar := v1.EnvVar{
	Name: keyToEnvName(key),
	ValueFrom: &v1.EnvVarSource{
	ConfigMapKeyRef: &v1.ConfigMapKeySelector{
	LocalObjectReference: v1.LocalObjectReference{
	Name: from.Name,
	},
	Key: key,
	},
	},
	}
	env = append(env, envVar)
	}
	}
	default:
	return fmt.Errorf("unsupported resource specified in --from")
	}
	}
	}

	if len(o.Prefix) != 0 {
	for i := range env {
	env[i].Name = fmt.Sprintf("%s%s", o.Prefix, env[i].Name)
	}
	}

	b := o.builder().
	WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
	LocalParam(o.Local).
	ContinueOnError().
	NamespaceParam(o.namespace).DefaultNamespace().
	FilenameParam(o.enforceNamespace, &o.FilenameOptions).
	Flatten()

	if !o.Local {
	b.LabelSelectorParam(o.Selector).
	ResourceTypeOrNameArgs(o.All, o.resources...).
	Latest()
	}

	infos, err := b.Do().Infos()
	if err != nil {
	return err
	}
	patches := CalculatePatches(infos, scheme.DefaultJSONEncoder(), func(obj runtime.Object) ([]byte, error) {
	_, err := o.updatePodSpecForObject(obj, func(spec *v1.PodSpec) error {
	resolutionErrorsEncountered := false
	containers, _ := selectContainers(spec.Containers, o.ContainerSelector)
	objName, err := meta.NewAccessor().Name(obj)
	if err != nil {
	return err
	}

	gvks, _, err := scheme.Scheme.ObjectKinds(obj)
	if err != nil {
	return err
	}
	objKind := obj.GetObjectKind().GroupVersionKind().Kind
	if len(objKind) == 0 {
	for _, gvk := range gvks {
	if len(gvk.Kind) == 0 {
	continue
	}
	if len(gvk.Version) == 0 \|\| gvk.Version == runtime.APIVersionInternal {
	continue
	}

	objKind = gvk.Kind
	break
	}
	}

	if len(containers) == 0 {
	if gvks, _, err := scheme.Scheme.ObjectKinds(obj); err == nil {
	objKind := obj.GetObjectKind().GroupVersionKind().Kind
	if len(objKind) == 0 {
	for _, gvk := range gvks {
	if len(gvk.Kind) == 0 {
	continue
	}
	if len(gvk.Version) == 0 \|\| gvk.Version == runtime.APIVersionInternal {
	continue
	}

	objKind = gvk.Kind
	break
	}
	}

	fmt.Fprintf(o.ErrOut, "warning: %s/%s does not have any containers matching %q\n", objKind, objName, o.ContainerSelector)
	}
	return nil
	}
	for _, c := range containers {
	if !o.Overwrite {
	if err := validateNoOverwrites(c.Env, env); err != nil {
	return err
	}
	}

	c.Env = updateEnv(c.Env, env, remove)
	if o.List {
	resolveErrors := map[string][]string{}
	store := envutil.NewResourceStore()

	fmt.Fprintf(o.Out, "# %s %s, container %s\n", objKind, objName, c.Name)
	for _, env := range c.Env {
	// Print the simple value
	if env.ValueFrom == nil {
	fmt.Fprintf(o.Out, "%s=%s\n", env.Name, env.Value)
	continue
	}

	// Print the reference version
	if !o.Resolve {
	fmt.Fprintf(o.Out, "# %s from %s\n", env.Name, envutil.GetEnvVarRefString(env.ValueFrom))
	continue
	}

	value, err := envutil.GetEnvVarRefValue(o.clientset, o.namespace, store, env.ValueFrom, obj, c)
	// Print the resolved value
	if err == nil {
	fmt.Fprintf(o.Out, "%s=%s\n", env.Name, value)
	continue
	}

	// Print the reference version and save the resolve error
	fmt.Fprintf(o.Out, "# %s from %s\n", env.Name, envutil.GetEnvVarRefString(env.ValueFrom))
	errString := err.Error()
	resolveErrors[errString] = append(resolveErrors[errString], env.Name)
	resolutionErrorsEncountered = true
	}

	// Print any resolution errors
	errs := []string{}
	for err, vars := range resolveErrors {
	sort.Strings(vars)
	errs = append(errs, fmt.Sprintf("error retrieving reference for %s: %v", strings.Join(vars, ", "), err))
	}
	sort.Strings(errs)
	for _, err := range errs {
	fmt.Fprintln(o.ErrOut, err)
	}
	}
	}
	if resolutionErrorsEncountered {
	return errors.New("failed to retrieve valueFrom references")
	}
	return nil
	})

	if err == nil {
	return runtime.Encode(scheme.DefaultJSONEncoder(), obj)
	}
	return nil, err
	})

	if o.List {
	return nil
	}

	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 {
	continue
	}

	if o.Local \|\| o.dryRun {
	if err := o.PrintObj(info.Object, o.Out); err != nil {
	allErrs = append(allErrs, err)
	}
	continue
	}

	actual, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, types.StrategicMergePatchType, patch.Patch, nil)
	if err != nil {
	allErrs = append(allErrs, fmt.Errorf("failed to patch env update to pod template: %v\n", err))
	continue
	}

	// make sure arguments to set or replace environment variables are set
	// before returning a successful message
	if len(env) == 0 && len(o.envArgs) == 0 {
	return fmt.Errorf("at least one environment variable must be provided")
	}

	if err := o.PrintObj(actual, o.Out); err != nil {
	allErrs = append(allErrs, err)
	}
	}
	return utilerrors.NewAggregate(allErrs)
	}