Create a new ServerType struct for storing details about the server on the client.

Signed-off-by: Daniel Nephin <dnephin@docker.com>

command/cli.go

@@ -44,28 +44,17 @@ type Cli interface {
 // DockerCli is an instance the docker command line client.
 // Instances of the client can be returned from NewDockerCli.
 type DockerCli struct {
-	configFile      *configfile.ConfigFile
-	in              *InStream
-	out             *OutStream
-	err             io.Writer
-	keyFile         string
-	client          client.APIClient
-	hasExperimental bool
-	osType          string
-	defaultVersion  string
+	configFile     *configfile.ConfigFile
+	in             *InStream
+	out            *OutStream
+	err            io.Writer
+	keyFile        string
+	client         client.APIClient
+	defaultVersion string
+	server         ServerInfo
 }
 
-// HasExperimental returns true if experimental features are accessible.
-func (cli *DockerCli) HasExperimental() bool {
-	return cli.hasExperimental
-}
-
-// OSType returns the operating system the daemon is running on.
-func (cli *DockerCli) OSType() string {
-	return cli.osType
-}
-
-// DefaultVersion returns api.defaultVersion of DOCKER_API_VERSION if specified.
+// DefaultVersion returns api.defaultVersion or DOCKER_API_VERSION if specified.
 func (cli *DockerCli) DefaultVersion() string {
 	return cli.defaultVersion
 }
@@ -102,6 +91,12 @@ func (cli *DockerCli) ConfigFile() *configfile.ConfigFile {
 	return cli.configFile
 }
 
+// ServerInfo returns the server version details for the host this client is
+// connected to
+func (cli *DockerCli) ServerInfo() ServerInfo {
+	return cli.server
+}
+
 // GetAllCredentials returns all of the credentials stored in all of the
 // configured credential stores.
 func (cli *DockerCli) GetAllCredentials() (map[string]types.AuthConfig, error) {
@@ -161,7 +156,6 @@ func (cli *DockerCli) Initialize(opts *cliflags.ClientOptions) error {
 	if err != nil {
 		return err
 	}
-
 	cli.defaultVersion = cli.client.ClientVersion()
 
 	if opts.Common.TrustKey == "" {
@@ -171,8 +165,10 @@ func (cli *DockerCli) Initialize(opts *cliflags.ClientOptions) error {
 	}
 
 	if ping, err := cli.client.Ping(context.Background()); err == nil {
-		cli.hasExperimental = ping.Experimental
-		cli.osType = ping.OSType
+		cli.server = ServerInfo{
+			HasExperimental: ping.Experimental,
+			OSType:          ping.OSType,
+		}
 
 		// since the new header was added in 1.25, assume server is 1.24 if header is not present.
 		if ping.APIVersion == "" {
@@ -184,9 +180,17 @@ func (cli *DockerCli) Initialize(opts *cliflags.ClientOptions) error {
 			cli.client.UpdateClientVersion(ping.APIVersion)
 		}
 	}
+
 	return nil
 }
 
+// ServerInfo stores details about the supported features and platform of the
+// server
+type ServerInfo struct {
+	HasExperimental bool
+	OSType          string
+}
+
 // NewDockerCli returns a DockerCli instance with IO output and error streams set by in, out and err.
 func NewDockerCli(in io.ReadCloser, out, err io.Writer) *DockerCli {
 	return &DockerCli{in: NewInStream(in), out: NewOutStream(out), err: err}