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options.go
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options.go
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package context
import (
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/context"
"github.com/docker/cli/cli/context/docker"
"github.com/docker/cli/cli/context/kubernetes"
"github.com/docker/cli/cli/context/store"
"github.com/docker/docker/client"
"github.com/docker/docker/pkg/homedir"
"github.com/pkg/errors"
)
const (
keyFrom = "from"
keyHost = "host"
keyCA = "ca"
keyCert = "cert"
keyKey = "key"
keySkipTLSVerify = "skip-tls-verify"
keyKubeconfig = "config-file"
keyKubecontext = "context-override"
keyKubenamespace = "namespace-override"
)
type configKeyDescription struct {
name string
description string
}
var (
allowedDockerConfigKeys = map[string]struct{}{
keyFrom: {},
keyHost: {},
keyCA: {},
keyCert: {},
keyKey: {},
keySkipTLSVerify: {},
}
allowedKubernetesConfigKeys = map[string]struct{}{
keyFrom: {},
keyKubeconfig: {},
keyKubecontext: {},
keyKubenamespace: {},
}
dockerConfigKeysDescriptions = []configKeyDescription{
{
name: keyFrom,
description: "Copy named context's Docker endpoint configuration",
},
{
name: keyHost,
description: "Docker endpoint on which to connect",
},
{
name: keyCA,
description: "Trust certs signed only by this CA",
},
{
name: keyCert,
description: "Path to TLS certificate file",
},
{
name: keyKey,
description: "Path to TLS key file",
},
{
name: keySkipTLSVerify,
description: "Skip TLS certificate validation",
},
}
kubernetesConfigKeysDescriptions = []configKeyDescription{
{
name: keyFrom,
description: "Copy named context's Kubernetes endpoint configuration",
},
{
name: keyKubeconfig,
description: "Path to a Kubernetes config file",
},
{
name: keyKubecontext,
description: "Overrides the context set in the kubernetes config file",
},
{
name: keyKubenamespace,
description: "Overrides the namespace set in the kubernetes config file",
},
}
)
func parseBool(config map[string]string, name string) (bool, error) {
strVal, ok := config[name]
if !ok {
return false, nil
}
res, err := strconv.ParseBool(strVal)
return res, errors.Wrap(err, name)
}
func validateConfig(config map[string]string, allowedKeys map[string]struct{}) error {
var errs []string
for k := range config {
if _, ok := allowedKeys[k]; !ok {
errs = append(errs, fmt.Sprintf("%s: unrecognized config key", k))
}
}
if len(errs) == 0 {
return nil
}
return errors.New(strings.Join(errs, "\n"))
}
func getDockerEndpoint(dockerCli command.Cli, config map[string]string) (docker.Endpoint, error) {
if err := validateConfig(config, allowedDockerConfigKeys); err != nil {
return docker.Endpoint{}, err
}
if contextName, ok := config[keyFrom]; ok {
metadata, err := dockerCli.ContextStore().GetMetadata(contextName)
if err != nil {
return docker.Endpoint{}, err
}
if ep, ok := metadata.Endpoints[docker.DockerEndpoint].(docker.EndpointMeta); ok {
return docker.Endpoint{EndpointMeta: ep}, nil
}
return docker.Endpoint{}, errors.Errorf("unable to get endpoint from context %q", contextName)
}
tlsData, err := context.TLSDataFromFiles(config[keyCA], config[keyCert], config[keyKey])
if err != nil {
return docker.Endpoint{}, err
}
skipTLSVerify, err := parseBool(config, keySkipTLSVerify)
if err != nil {
return docker.Endpoint{}, err
}
ep := docker.Endpoint{
EndpointMeta: docker.EndpointMeta{
Host: config[keyHost],
SkipTLSVerify: skipTLSVerify,
},
TLSData: tlsData,
}
// try to resolve a docker client, validating the configuration
opts, err := ep.ClientOpts()
if err != nil {
return docker.Endpoint{}, errors.Wrap(err, "invalid docker endpoint options")
}
if _, err := client.NewClientWithOpts(opts...); err != nil {
return docker.Endpoint{}, errors.Wrap(err, "unable to apply docker endpoint options")
}
return ep, nil
}
func getDockerEndpointMetadataAndTLS(dockerCli command.Cli, config map[string]string) (docker.EndpointMeta, *store.EndpointTLSData, error) {
ep, err := getDockerEndpoint(dockerCli, config)
if err != nil {
return docker.EndpointMeta{}, nil, err
}
return ep.EndpointMeta, ep.TLSData.ToStoreTLSData(), nil
}
func getKubernetesEndpoint(dockerCli command.Cli, config map[string]string) (*kubernetes.Endpoint, error) {
if err := validateConfig(config, allowedKubernetesConfigKeys); err != nil {
return nil, err
}
if len(config) == 0 {
return nil, nil
}
if contextName, ok := config[keyFrom]; ok {
ctxMeta, err := dockerCli.ContextStore().GetMetadata(contextName)
if err != nil {
return nil, err
}
endpointMeta := kubernetes.EndpointFromContext(ctxMeta)
if endpointMeta != nil {
res, err := endpointMeta.WithTLSData(dockerCli.ContextStore(), dockerCli.CurrentContext())
if err != nil {
return nil, err
}
return &res, nil
}
// fallback to env-based kubeconfig
kubeconfig := os.Getenv("KUBECONFIG")
if kubeconfig == "" {
kubeconfig = filepath.Join(homedir.Get(), ".kube/config")
}
ep, err := kubernetes.FromKubeConfig(kubeconfig, "", "")
if err != nil {
return nil, err
}
return &ep, nil
}
if config[keyKubeconfig] != "" {
ep, err := kubernetes.FromKubeConfig(config[keyKubeconfig], config[keyKubecontext], config[keyKubenamespace])
if err != nil {
return nil, err
}
return &ep, nil
}
return nil, nil
}
func getKubernetesEndpointMetadataAndTLS(dockerCli command.Cli, config map[string]string) (*kubernetes.EndpointMeta, *store.EndpointTLSData, error) {
ep, err := getKubernetesEndpoint(dockerCli, config)
if err != nil {
return nil, nil, err
}
if ep == nil {
return nil, nil, err
}
return &ep.EndpointMeta, ep.TLSData.ToStoreTLSData(), nil
}