DockerCLI/cli/command/defaultcontextstore.go

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package command
import (
"fmt"
"io"
"os"
"path/filepath"
"github.com/docker/cli/cli/config/configfile"
"github.com/docker/cli/cli/context/docker"
"github.com/docker/cli/cli/context/kubernetes"
"github.com/docker/cli/cli/context/store"
cliflags "github.com/docker/cli/cli/flags"
"github.com/docker/docker/pkg/homedir"
"github.com/pkg/errors"
)
const (
// DefaultContextName is the name reserved for the default context (config & env based)
DefaultContextName = "default"
)
// DefaultContext contains the default context data for all enpoints
type DefaultContext struct {
Meta store.Metadata
TLS store.ContextTLSData
}
// DefaultContextResolver is a function which resolves the default context base on the configuration and the env variables
type DefaultContextResolver func() (*DefaultContext, error)
// ContextStoreWithDefault implements the store.Store interface with a support for the default context
type ContextStoreWithDefault struct {
store.Store
Resolver DefaultContextResolver
}
// resolveDefaultContext creates a Metadata for the current CLI invocation parameters
func resolveDefaultContext(opts *cliflags.CommonOptions, config *configfile.ConfigFile, stderr io.Writer) (*DefaultContext, error) {
stackOrchestrator, err := GetStackOrchestrator("", "", config.StackOrchestrator, stderr)
if err != nil {
return nil, err
}
contextTLSData := store.ContextTLSData{
Endpoints: make(map[string]store.EndpointTLSData),
}
contextMetadata := store.Metadata{
Endpoints: make(map[string]interface{}),
Metadata: DockerContext{
Description: "",
StackOrchestrator: stackOrchestrator,
},
Name: DefaultContextName,
}
dockerEP, err := resolveDefaultDockerEndpoint(opts)
if err != nil {
return nil, err
}
contextMetadata.Endpoints[docker.DockerEndpoint] = dockerEP.EndpointMeta
if dockerEP.TLSData != nil {
contextTLSData.Endpoints[docker.DockerEndpoint] = *dockerEP.TLSData.ToStoreTLSData()
}
// Default context uses env-based kubeconfig for Kubernetes endpoint configuration
kubeconfig := os.Getenv("KUBECONFIG")
if kubeconfig == "" {
kubeconfig = filepath.Join(homedir.Get(), ".kube/config")
}
kubeEP, err := kubernetes.FromKubeConfig(kubeconfig, "", "")
if (stackOrchestrator == OrchestratorKubernetes || stackOrchestrator == OrchestratorAll) && err != nil {
return nil, errors.Wrapf(err, "default orchestrator is %s but kubernetes endpoint could not be found", stackOrchestrator)
}
if err == nil {
contextMetadata.Endpoints[kubernetes.KubernetesEndpoint] = kubeEP.EndpointMeta
if kubeEP.TLSData != nil {
contextTLSData.Endpoints[kubernetes.KubernetesEndpoint] = *kubeEP.TLSData.ToStoreTLSData()
}
}
return &DefaultContext{Meta: contextMetadata, TLS: contextTLSData}, nil
}
// List implements store.Store's List
func (s *ContextStoreWithDefault) List() ([]store.Metadata, error) {
contextList, err := s.Store.List()
if err != nil {
return nil, err
}
defaultContext, err := s.Resolver()
if err != nil {
return nil, err
}
return append(contextList, defaultContext.Meta), nil
}
// CreateOrUpdate is not allowed for the default context and fails
func (s *ContextStoreWithDefault) CreateOrUpdate(meta store.Metadata) error {
if meta.Name == DefaultContextName {
return errors.New("default context cannot be created nor updated")
}
return s.Store.CreateOrUpdate(meta)
}
// Remove is not allowed for the default context and fails
func (s *ContextStoreWithDefault) Remove(name string) error {
if name == DefaultContextName {
return errors.New("default context cannot be removed")
}
return s.Store.Remove(name)
}
// GetMetadata implements store.Store's GetMetadata
func (s *ContextStoreWithDefault) GetMetadata(name string) (store.Metadata, error) {
if name == DefaultContextName {
defaultContext, err := s.Resolver()
if err != nil {
return store.Metadata{}, err
}
return defaultContext.Meta, nil
}
return s.Store.GetMetadata(name)
}
// ResetTLSMaterial is not implemented for default context and fails
func (s *ContextStoreWithDefault) ResetTLSMaterial(name string, data *store.ContextTLSData) error {
if name == DefaultContextName {
return errors.New("The default context store does not support ResetTLSMaterial")
}
return s.Store.ResetTLSMaterial(name, data)
}
// ResetEndpointTLSMaterial is not implemented for default context and fails
func (s *ContextStoreWithDefault) ResetEndpointTLSMaterial(contextName string, endpointName string, data *store.EndpointTLSData) error {
if contextName == DefaultContextName {
return errors.New("The default context store does not support ResetEndpointTLSMaterial")
}
return s.Store.ResetEndpointTLSMaterial(contextName, endpointName, data)
}
// ListTLSFiles implements store.Store's ListTLSFiles
func (s *ContextStoreWithDefault) ListTLSFiles(name string) (map[string]store.EndpointFiles, error) {
if name == DefaultContextName {
defaultContext, err := s.Resolver()
if err != nil {
return nil, err
}
tlsfiles := make(map[string]store.EndpointFiles)
for epName, epTLSData := range defaultContext.TLS.Endpoints {
var files store.EndpointFiles
for filename := range epTLSData.Files {
files = append(files, filename)
}
tlsfiles[epName] = files
}
return tlsfiles, nil
}
return s.Store.ListTLSFiles(name)
}
// GetTLSData implements store.Store's GetTLSData
func (s *ContextStoreWithDefault) GetTLSData(contextName, endpointName, fileName string) ([]byte, error) {
if contextName == DefaultContextName {
defaultContext, err := s.Resolver()
if err != nil {
return nil, err
}
if defaultContext.TLS.Endpoints[endpointName].Files[fileName] == nil {
return nil, &noDefaultTLSDataError{endpointName: endpointName, fileName: fileName}
}
return defaultContext.TLS.Endpoints[endpointName].Files[fileName], nil
}
return s.Store.GetTLSData(contextName, endpointName, fileName)
}
type noDefaultTLSDataError struct {
endpointName string
fileName string
}
func (e *noDefaultTLSDataError) Error() string {
return fmt.Sprintf("tls data for %s/%s/%s does not exist", DefaultContextName, e.endpointName, e.fileName)
}
// NotFound satisfies interface github.com/docker/docker/errdefs.ErrNotFound
func (e *noDefaultTLSDataError) NotFound() {}
// IsTLSDataDoesNotExist satisfies github.com/docker/cli/cli/context/store.tlsDataDoesNotExist
func (e *noDefaultTLSDataError) IsTLSDataDoesNotExist() {}
// GetStorageInfo implements store.Store's GetStorageInfo
func (s *ContextStoreWithDefault) GetStorageInfo(contextName string) store.StorageInfo {
if contextName == DefaultContextName {
return store.StorageInfo{MetadataPath: "<IN MEMORY>", TLSPath: "<IN MEMORY>"}
}
return s.Store.GetStorageInfo(contextName)
}