package runconfig // import "github.com/docker/docker/runconfig"

 
 import (

 	"encoding/json"
 	"io"

 	"strings"

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

 )
 

 // DecodeHostConfig creates a HostConfig based on the specified Reader.
 // It assumes the content of the reader will be JSON, and decodes it.

 func decodeHostConfig(src io.Reader) (*container.HostConfig, error) {

 	decoder := json.NewDecoder(src)
 

 	var w ContainerConfigWrapper

 	if err := decoder.Decode(&w); err != nil {
 		return nil, err

 	}

 	hc := w.getHostConfig()

 	return hc, nil

 }

 
 // SetDefaultNetModeIfBlank changes the NetworkMode in a HostConfig structure
 // to default if it is not populated. This ensures backwards compatibility after
 // the validation of the network mode was moved from the docker CLI to the
 // docker daemon.

 func SetDefaultNetModeIfBlank(hc *container.HostConfig) {

 	if hc != nil {

 		if hc.NetworkMode == container.NetworkMode("") {
 			hc.NetworkMode = container.NetworkMode("default")

 		}
 	}
 }

 // validateNetContainerMode ensures that the various combinations of requested

 // network settings wrt container mode are valid.

 func validateNetContainerMode(c *container.Config, 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
 	}
 	parts := strings.Split(string(hc.NetworkMode), ":")
 	if parts[0] == "container" {
 		if len(parts) < 2 || parts[1] == "" {

 			return validationError("Invalid network mode: invalid container format container:<name|id>")

 		}
 	}
 
 	if hc.NetworkMode.IsContainer() && c.Hostname != "" {
 		return ErrConflictNetworkHostname
 	}
 
 	if hc.NetworkMode.IsContainer() && len(hc.Links) > 0 {
 		return ErrConflictContainerNetworkAndLinks
 	}
 
 	if hc.NetworkMode.IsContainer() && len(hc.DNS) > 0 {
 		return ErrConflictNetworkAndDNS
 	}
 
 	if hc.NetworkMode.IsContainer() && len(hc.ExtraHosts) > 0 {
 		return ErrConflictNetworkHosts
 	}
 
 	if (hc.NetworkMode.IsContainer() || hc.NetworkMode.IsHost()) && c.MacAddress != "" {
 		return ErrConflictContainerNetworkAndMac
 	}
 

 	if hc.NetworkMode.IsContainer() && (len(hc.PortBindings) > 0 || hc.PublishAllPorts) {

 		return ErrConflictNetworkPublishPorts
 	}
 
 	if hc.NetworkMode.IsContainer() && len(c.ExposedPorts) > 0 {
 		return ErrConflictNetworkExposePorts
 	}
 	return nil
 }