vendor: update buildkit to v0.8

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor/github.com/docker/cli/cli/cobra.go

@@ -35,6 +35,7 @@ func setupCommonRootCommand(rootCmd *cobra.Command) (*cliflags.ClientOptions, *p
 	cobra.AddTemplateFunc("vendorAndVersion", vendorAndVersion)
 	cobra.AddTemplateFunc("invalidPluginReason", invalidPluginReason)
 	cobra.AddTemplateFunc("isPlugin", isPlugin)
+	cobra.AddTemplateFunc("isExperimental", isExperimental)
 	cobra.AddTemplateFunc("decoratedName", decoratedName)
 
 	rootCmd.SetUsageTemplate(usageTemplate)
@@ -191,6 +192,19 @@ var helpCommand = &cobra.Command{
 	},
 }
 
+func isExperimental(cmd *cobra.Command) bool {
+	if _, ok := cmd.Annotations["experimentalCLI"]; ok {
+		return true
+	}
+	var experimental bool
+	cmd.VisitParents(func(cmd *cobra.Command) {
+		if _, ok := cmd.Annotations["experimentalCLI"]; ok {
+			experimental = true
+		}
+	})
+	return experimental
+}
+
 func isPlugin(cmd *cobra.Command) bool {
 	return cmd.Annotations[pluginmanager.CommandAnnotationPlugin] == "true"
 }
@@ -282,11 +296,20 @@ func invalidPluginReason(cmd *cobra.Command) string {
 
 var usageTemplate = `Usage:
 
-{{- if not .HasSubCommands}}	{{.UseLine}}{{end}}
-{{- if .HasSubCommands}}	{{ .CommandPath}}{{- if .HasAvailableFlags}} [OPTIONS]{{end}} COMMAND{{end}}
+{{- if not .HasSubCommands}}  {{.UseLine}}{{end}}
+{{- if .HasSubCommands}}  {{ .CommandPath}}{{- if .HasAvailableFlags}} [OPTIONS]{{end}} COMMAND{{end}}
 
 {{if ne .Long ""}}{{ .Long | trim }}{{ else }}{{ .Short | trim }}{{end}}
+{{- if isExperimental .}}
 
+EXPERIMENTAL:
+  {{.CommandPath}} is an experimental feature.
+  Experimental features provide early access to product functionality. These
+  features may change between releases without warning, or can be removed from a
+  future release. Learn more about experimental features in our documentation:
+  https://docs.docker.com/go/experimental/
+
+{{- end}}
 {{- if gt .Aliases 0}}
 
 Aliases:

vendor/github.com/docker/cli/cli/command/cli.go

@@ -152,16 +152,6 @@ func (cli *DockerCli) ClientInfo() ClientInfo {
 }
 
 func (cli *DockerCli) loadClientInfo() error {
-	var experimentalValue string
-	// Environment variable always overrides configuration
-	if experimentalValue = os.Getenv("DOCKER_CLI_EXPERIMENTAL"); experimentalValue == "" {
-		experimentalValue = cli.ConfigFile().Experimental
-	}
-	hasExperimental, err := isEnabled(experimentalValue)
-	if err != nil {
-		return errors.Wrap(err, "Experimental field")
-	}
-
 	var v string
 	if cli.client != nil {
 		v = cli.client.ClientVersion()
@@ -170,7 +160,7 @@ func (cli *DockerCli) loadClientInfo() error {
 	}
 	cli.clientInfo = &ClientInfo{
 		DefaultVersion:  v,
-		HasExperimental: hasExperimental,
+		HasExperimental: true,
 	}
 	return nil
 }
@@ -308,9 +298,9 @@ func newAPIClientFromEndpoint(ep docker.Endpoint, configFile *configfile.ConfigF
 	if err != nil {
 		return nil, err
 	}
-	customHeaders := configFile.HTTPHeaders
-	if customHeaders == nil {
-		customHeaders = map[string]string{}
+	customHeaders := make(map[string]string, len(configFile.HTTPHeaders))
+	for k, v := range configFile.HTTPHeaders {
+		customHeaders[k] = v
 	}
 	customHeaders["User-Agent"] = UserAgent()
 	clientOpts = append(clientOpts, client.WithHTTPHeaders(customHeaders))
@@ -358,17 +348,6 @@ func resolveDefaultDockerEndpoint(opts *cliflags.CommonOptions) (docker.Endpoint
 	}, nil
 }
 
-func isEnabled(value string) (bool, error) {
-	switch value {
-	case "enabled":
-		return true, nil
-	case "", "disabled":
-		return false, nil
-	default:
-		return false, errors.Errorf("%q is not valid, should be either enabled or disabled", value)
-	}
-}
-
 func (cli *DockerCli) initializeFromClient() {
 	ctx := context.Background()
 	if strings.HasPrefix(cli.DockerEndpoint().Host, "tcp://") {
@@ -471,6 +450,8 @@ type ServerInfo struct {
 
 // ClientInfo stores details about the supported features of the client
 type ClientInfo struct {
+	// Deprecated: experimental CLI features always enabled. This field is kept
+	// for backward-compatibility, and is always "true".
 	HasExperimental bool
 	DefaultVersion  string
 }

vendor/github.com/docker/cli/cli/command/registry.go

@@ -93,17 +93,18 @@ func GetDefaultAuthConfig(cli Cli, checkCredStore bool, serverAddress string, is
 	if !isDefaultRegistry {
 		serverAddress = registry.ConvertToHostname(serverAddress)
 	}
-	var authconfig configtypes.AuthConfig
+	var authconfig = configtypes.AuthConfig{}
 	var err error
 	if checkCredStore {
 		authconfig, err = cli.ConfigFile().GetAuthConfig(serverAddress)
-	} else {
-		authconfig = configtypes.AuthConfig{}
+		if err != nil {
+			return nil, err
+		}
 	}
 	authconfig.ServerAddress = serverAddress
 	authconfig.IdentityToken = ""
 	res := types.AuthConfig(authconfig)
-	return &res, err
+	return &res, nil
 }
 
 // ConfigureAuth handles prompting of user's username and password if needed

vendor/github.com/docker/cli/cli/config/configfile/file.go

@@ -169,6 +169,13 @@ func (configFile *ConfigFile) SaveToWriter(writer io.Writer) error {
 	configFile.AuthConfigs = tmpAuthConfigs
 	defer func() { configFile.AuthConfigs = saveAuthConfigs }()
 
+	// User-Agent header is automatically set, and should not be stored in the configuration
+	for v := range configFile.HTTPHeaders {
+		if strings.EqualFold(v, "User-Agent") {
+			delete(configFile.HTTPHeaders, v)
+		}
+	}
+
 	data, err := json.MarshalIndent(configFile, "", "\t")
 	if err != nil {
 		return err