DockerCLI/cli/command/context/create.go

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package context
import (
"bytes"
"fmt"
"text/tabwriter"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/context/docker"
"github.com/docker/cli/cli/context/kubernetes"
"github.com/docker/cli/cli/context/store"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
// CreateOptions are the options used for creating a context
type CreateOptions struct {
Name string
Description string
DefaultStackOrchestrator string
Docker map[string]string
Kubernetes map[string]string
From string
}
func longCreateDescription() string {
buf := bytes.NewBuffer(nil)
buf.WriteString("Create a context\n\nDocker endpoint config:\n\n")
tw := tabwriter.NewWriter(buf, 20, 1, 3, ' ', 0)
fmt.Fprintln(tw, "NAME\tDESCRIPTION")
for _, d := range dockerConfigKeysDescriptions {
fmt.Fprintf(tw, "%s\t%s\n", d.name, d.description)
}
tw.Flush()
buf.WriteString("\nKubernetes endpoint config:\n\n")
tw = tabwriter.NewWriter(buf, 20, 1, 3, ' ', 0)
fmt.Fprintln(tw, "NAME\tDESCRIPTION")
for _, d := range kubernetesConfigKeysDescriptions {
fmt.Fprintf(tw, "%s\t%s\n", d.name, d.description)
}
tw.Flush()
buf.WriteString("\nExample:\n\n$ docker context create my-context --description \"some description\" --docker \"host=tcp://myserver:2376,ca=~/ca-file,cert=~/cert-file,key=~/key-file\"\n")
return buf.String()
}
func newCreateCommand(dockerCli command.Cli) *cobra.Command {
opts := &CreateOptions{}
cmd := &cobra.Command{
Use: "create [OPTIONS] CONTEXT",
Short: "Create a context",
Args: cli.ExactArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
opts.Name = args[0]
return RunCreate(dockerCli, opts)
},
Long: longCreateDescription(),
}
flags := cmd.Flags()
flags.StringVar(&opts.Description, "description", "", "Description of the context")
flags.StringVar(
&opts.DefaultStackOrchestrator,
"default-stack-orchestrator", "",
"Default orchestrator for stack operations to use with this context (swarm|kubernetes|all)")
flags.StringToStringVar(&opts.Docker, "docker", nil, "set the docker endpoint")
flags.StringToStringVar(&opts.Kubernetes, "kubernetes", nil, "set the kubernetes endpoint")
flags.StringVar(&opts.From, "from", "", "create context from a named context")
return cmd
}
// RunCreate creates a Docker context
func RunCreate(cli command.Cli, o *CreateOptions) error {
s := cli.ContextStore()
if err := checkContextNameForCreation(s, o.Name); err != nil {
return err
}
stackOrchestrator, err := command.NormalizeOrchestrator(o.DefaultStackOrchestrator)
if err != nil {
return errors.Wrap(err, "unable to parse default-stack-orchestrator")
}
if o.From == "" && o.Docker == nil && o.Kubernetes == nil {
return createFromExistingContext(s, cli.CurrentContext(), stackOrchestrator, o)
}
if o.From != "" {
return createFromExistingContext(s, o.From, stackOrchestrator, o)
}
return createNewContext(o, stackOrchestrator, cli, s)
}
func createNewContext(o *CreateOptions, stackOrchestrator command.Orchestrator, cli command.Cli, s store.Writer) error {
if o.Docker == nil {
return errors.New("docker endpoint configuration is required")
}
contextMetadata := newContextMetadata(stackOrchestrator, o)
contextTLSData := store.ContextTLSData{
Endpoints: make(map[string]store.EndpointTLSData),
}
dockerEP, dockerTLS, err := getDockerEndpointMetadataAndTLS(cli, o.Docker)
if err != nil {
return errors.Wrap(err, "unable to create docker endpoint config")
}
contextMetadata.Endpoints[docker.DockerEndpoint] = dockerEP
if dockerTLS != nil {
contextTLSData.Endpoints[docker.DockerEndpoint] = *dockerTLS
}
if o.Kubernetes != nil {
kubernetesEP, kubernetesTLS, err := getKubernetesEndpointMetadataAndTLS(cli, o.Kubernetes)
if err != nil {
return errors.Wrap(err, "unable to create kubernetes endpoint config")
}
if kubernetesEP == nil && stackOrchestrator.HasKubernetes() {
return errors.Errorf("cannot specify orchestrator %q without configuring a Kubernetes endpoint", stackOrchestrator)
}
if kubernetesEP != nil {
contextMetadata.Endpoints[kubernetes.KubernetesEndpoint] = kubernetesEP
}
if kubernetesTLS != nil {
contextTLSData.Endpoints[kubernetes.KubernetesEndpoint] = *kubernetesTLS
}
}
if err := validateEndpointsAndOrchestrator(contextMetadata); err != nil {
return err
}
if err := s.CreateOrUpdate(contextMetadata); err != nil {
return err
}
if err := s.ResetTLSMaterial(o.Name, &contextTLSData); err != nil {
return err
}
fmt.Fprintln(cli.Out(), o.Name)
fmt.Fprintf(cli.Err(), "Successfully created context %q\n", o.Name)
return nil
}
func checkContextNameForCreation(s store.Reader, name string) error {
if err := validateContextName(name); err != nil {
return err
}
if _, err := s.GetMetadata(name); !store.IsErrContextDoesNotExist(err) {
if err != nil {
return errors.Wrap(err, "error while getting existing contexts")
}
return errors.Errorf("context %q already exists", name)
}
return nil
}
func createFromExistingContext(s store.ReaderWriter, fromContextName string, stackOrchestrator command.Orchestrator, o *CreateOptions) error {
if len(o.Docker) != 0 || len(o.Kubernetes) != 0 {
return errors.New("cannot use --docker or --kubernetes flags when --from is set")
}
reader := store.Export(fromContextName, &descriptionAndOrchestratorStoreDecorator{
Reader: s,
description: o.Description,
orchestrator: stackOrchestrator,
})
defer reader.Close()
return store.Import(o.Name, s, reader)
}
type descriptionAndOrchestratorStoreDecorator struct {
store.Reader
description string
orchestrator command.Orchestrator
}
func (d *descriptionAndOrchestratorStoreDecorator) GetMetadata(name string) (store.Metadata, error) {
c, err := d.Reader.GetMetadata(name)
if err != nil {
return c, err
}
typedContext, err := command.GetDockerContext(c)
if err != nil {
return c, err
}
if d.description != "" {
typedContext.Description = d.description
}
if d.orchestrator != command.Orchestrator("") {
typedContext.StackOrchestrator = d.orchestrator
}
c.Metadata = typedContext
return c, nil
}
func newContextMetadata(stackOrchestrator command.Orchestrator, o *CreateOptions) store.Metadata {
return store.Metadata{
Endpoints: make(map[string]interface{}),
Metadata: command.DockerContext{
Description: o.Description,
StackOrchestrator: stackOrchestrator,
},
Name: o.Name,
}
}