package runconfig
 

 import (
 	"fmt"
 	"strings"

 	"github.com/docker/engine-api/types/container"

 )

 // DefaultDaemonNetworkMode returns the default network stack the daemon should
 // use.

 func DefaultDaemonNetworkMode() container.NetworkMode {

 	return container.NetworkMode("nat")

 }

 
 // IsPreDefinedNetwork indicates if a network is predefined by the daemon
 func IsPreDefinedNetwork(network string) bool {

 	return !container.NetworkMode(network).IsUserDefined()

 }

 
 // ValidateNetMode ensures that the various combinations of requested
 // network settings are valid.

 func ValidateNetMode(c *container.Config, hc *container.HostConfig) error {

 	if hc == nil {
 		return nil
 	}
 	parts := strings.Split(string(hc.NetworkMode), ":")

 	if len(parts) > 1 {

 		return fmt.Errorf("invalid --net: %s", hc.NetworkMode)
 	}
 	return nil
 }
 

 // ValidateIsolation performs platform specific validation of the
 // isolation in the hostconfig structure. Windows supports 'default' (or

 // blank), 'process', or 'hyperv'.

 func ValidateIsolation(hc *container.HostConfig) error {

 	// We may not be passed a host config, such as in the case of docker commit
 	if hc == nil {
 		return nil
 	}
 	if !hc.Isolation.IsValid() {

 		return fmt.Errorf("invalid --isolation: %q. Windows supports 'default', 'process', or 'hyperv'", hc.Isolation)

 	}
 	return nil
 }