@@ -2,7 +2,6 @@ package daemon // import "github.com/docker/docker/daemon"

 import (

 	"errors"

-	"runtime"

 	"time"

 	"github.com/docker/docker/pkg/archive"

@@ -16,7 +15,7 @@ func (daemon *Daemon) ContainerChanges(name string) ([]archive.Change, error) {

 		return nil, err

 	}

-	if runtime.GOOS == "windows" && container.IsRunning() {

+	if isWindows && container.IsRunning() {

 		return nil, errors.New("Windows does not support diff of a running container")

 	}

@@ -45,6 +45,7 @@ import (

 	"net"

 	"os"

 	"path/filepath"

+	"runtime"

 	"sync"

 	"time"

@@ -61,14 +62,14 @@ import (

 	"google.golang.org/grpc"

 )

-const swarmDirName = "swarm"

-const controlSocket = "control.sock"

-const swarmConnectTimeout = 20 * time.Second

-const swarmRequestTimeout = 20 * time.Second

-const stateFile = "docker-state.json"

-const defaultAddr = "0.0.0.0:2377"

-

 const (

+	swarmDirName                   = "swarm"

+	controlSocket                  = "control.sock"

+	swarmConnectTimeout            = 20 * time.Second

+	swarmRequestTimeout            = 20 * time.Second

+	stateFile                      = "docker-state.json"

+	defaultAddr                    = "0.0.0.0:2377"

+	isWindows                      = runtime.GOOS == "windows"

 	initialReconnectDelay          = 100 * time.Millisecond

 	maxReconnectDelay              = 30 * time.Second

 	contextPrefix                  = "com.docker.swarm"

@@ -4,7 +4,6 @@ import (

 	"context"

 	"fmt"

 	"path/filepath"

-	"runtime"

 	"strings"

 	"sync"

 	"time"

@@ -104,7 +103,7 @@ func (n *nodeRunner) Start(conf nodeStartConfig) error {

 func (n *nodeRunner) start(conf nodeStartConfig) error {

 	var control string

-	if runtime.GOOS == "windows" {

+	if isWindows {

 		control = `\\.\pipe\` + controlSocket

 	} else {

 		control = filepath.Join(n.cluster.runtimeRoot, controlSocket)

@@ -40,7 +40,7 @@ func merge(userConf, imageConf *containertypes.Config) error {

 			imageEnvKey := strings.Split(imageEnv, "=")[0]

 			for _, userEnv := range userConf.Env {

 				userEnvKey := strings.Split(userEnv, "=")[0]

-				if runtime.GOOS == "windows" {

+				if isWindows {

 					// Case insensitive environment variables on Windows

 					imageEnvKey = strings.ToUpper(imageEnvKey)

 					userEnvKey = strings.ToUpper(userEnvKey)

@@ -124,7 +124,7 @@ func (daemon *Daemon) CreateImageFromContainer(name string, c *backend.CreateIma

 	}

 	// It is not possible to commit a running container on Windows

-	if (runtime.GOOS == "windows") && container.IsRunning() {

+	if isWindows && container.IsRunning() {

 		return "", errors.Errorf("%+v does not support commit of a running container", runtime.GOOS)

 	}

@@ -67,7 +67,7 @@ func (daemon *Daemon) containerCreate(opts createOpts) (containertypes.Container

 	} else {

 		// This mean scratch. On Windows, we can safely assume that this is a linux

 		// container. On other platforms, it's the host OS (which it already is)

-		if runtime.GOOS == "windows" && system.LCOWSupported() {

+		if isWindows && system.LCOWSupported() {

 			os = "linux"

 		}

 	}

@@ -122,17 +122,17 @@ func (daemon *Daemon) create(opts createOpts) (retC *container.Container, retErr

 			os = img.OS

 		} else {

 			// default to the host OS except on Windows with LCOW

-			if runtime.GOOS == "windows" && system.LCOWSupported() {

+			if isWindows && system.LCOWSupported() {

 				os = "linux"

 			}

 		}

 		imgID = img.ID()

-		if runtime.GOOS == "windows" && img.OS == "linux" && !system.LCOWSupported() {

+		if isWindows && img.OS == "linux" && !system.LCOWSupported() {

 			return nil, errors.New("operating system on which parent image was created is not Windows")

 		}

 	} else {

-		if runtime.GOOS == "windows" {

+		if isWindows {

 			os = "linux" // 'scratch' case.

 		}

 	}

@@ -175,7 +175,7 @@ func (daemon *Daemon) create(opts createOpts) (retC *container.Container, retErr

 	// Merge the daemon's storage options if they aren't already present. We only

 	// do this on Windows as there's no effective sandbox size limit other than

 	// physical on Linux.

-	if runtime.GOOS == "windows" {

+	if isWindows {

 		if container.HostConfig.StorageOpt == nil {

 			container.HostConfig.StorageOpt = make(map[string]string)

 		}

@@ -74,7 +74,9 @@ import (

 )

 // ContainersNamespace is the name of the namespace used for users containers

-const ContainersNamespace = "moby"

+const (

+	ContainersNamespace = "moby"

+)

 var (

 	errSystemNotSupported = errors.New("the Docker daemon is not supported on this platform")

@@ -775,7 +777,7 @@ func NewDaemon(ctx context.Context, config *config.Config, pluginStore *plugin.S

 	if err != nil {

 		return nil, fmt.Errorf("Unable to get the full path to the TempDir (%s): %s", tmp, err)

 	}

-	if runtime.GOOS == "windows" {

+	if isWindows {

 		if _, err := os.Stat(realTmp); err != nil && os.IsNotExist(err) {

 			if err := system.MkdirAll(realTmp, 0700); err != nil {

 				return nil, fmt.Errorf("Unable to create the TempDir (%s): %s", realTmp, err)

@@ -846,7 +848,7 @@ func NewDaemon(ctx context.Context, config *config.Config, pluginStore *plugin.S

 		return nil, err

 	}

-	if runtime.GOOS == "windows" {

+	if isWindows {

 		if err := system.MkdirAll(filepath.Join(config.Root, "credentialspecs"), 0); err != nil {

 			return nil, err

 		}

@@ -860,7 +862,7 @@ func NewDaemon(ctx context.Context, config *config.Config, pluginStore *plugin.S

 	// initialization of the layerstore through driver priority order for example.

 	d.graphDrivers = make(map[string]string)

 	layerStores := make(map[string]layer.Store)

-	if runtime.GOOS == "windows" {

+	if isWindows {

 		d.graphDrivers[runtime.GOOS] = "windowsfilter"

 		if system.LCOWSupported() {

 			d.graphDrivers["linux"] = "lcow"

@@ -53,6 +53,8 @@ import (

 )

 const (

+	isWindows = false

+

 	// DefaultShimBinary is the default shim to be used by containerd if none

 	// is specified

 	DefaultShimBinary = "containerd-shim"

@@ -31,6 +31,7 @@ import (

 )

 const (

+	isWindows            = true

 	defaultNetworkSpace  = "172.16.0.0/12"

 	platformSupported    = true

 	windowsMinCPUShares  = 1

@@ -3,7 +3,6 @@ package daemon // import "github.com/docker/docker/daemon"

 import (

 	"fmt"

 	"io"

-	"runtime"

 	"github.com/docker/docker/container"

 	"github.com/docker/docker/errdefs"

@@ -20,7 +19,7 @@ func (daemon *Daemon) ContainerExport(name string, out io.Writer) error {

 		return err

 	}

-	if runtime.GOOS == "windows" && container.OS == "windows" {

+	if isWindows && container.OS == "windows" {

 		return fmt.Errorf("the daemon on this operating system does not support exporting Windows containers")

 	}

@@ -2,7 +2,6 @@ package daemon // import "github.com/docker/docker/daemon"

 import (

 	"context"

-	"runtime"

 	"strconv"

 	"time"

@@ -35,7 +34,7 @@ func (daemon *Daemon) ProcessEvent(id string, e libcontainerdtypes.EventType, ei

 	switch e {

 	case libcontainerdtypes.EventOOM:

 		// StateOOM is Linux specific and should never be hit on Windows

-		if runtime.GOOS == "windows" {

+		if isWindows {

 			return errors.New("received StateOOM from libcontainerd on Windows. This should never happen")

 		}

@@ -21,7 +21,7 @@ func (daemon *Daemon) ContainerStats(ctx context.Context, prefixOrName string, c

 	// Engine API version (used for backwards compatibility)

 	apiVersion := config.Version

-	if runtime.GOOS == "windows" && versions.LessThan(apiVersion, "1.21") {

+	if isWindows && versions.LessThan(apiVersion, "1.21") {

 		return errors.New("API versions pre v1.21 do not support stats on Windows")

 	}