github.com/docker/docker@v299999999.0.0-20200612211812-aaf470eca7b5+incompatible/runconfig/hostconfig.go (about)

     1  package runconfig // import "github.com/docker/docker/runconfig"
     2  
     3  import (
     4  	"encoding/json"
     5  	"io"
     6  	"strings"
     7  
     8  	"github.com/docker/docker/api/types/container"
     9  )
    10  
    11  // DecodeHostConfig creates a HostConfig based on the specified Reader.
    12  // It assumes the content of the reader will be JSON, and decodes it.
    13  func decodeHostConfig(src io.Reader) (*container.HostConfig, error) {
    14  	decoder := json.NewDecoder(src)
    15  
    16  	var w ContainerConfigWrapper
    17  	if err := decoder.Decode(&w); err != nil {
    18  		return nil, err
    19  	}
    20  
    21  	hc := w.getHostConfig()
    22  	return hc, nil
    23  }
    24  
    25  // SetDefaultNetModeIfBlank changes the NetworkMode in a HostConfig structure
    26  // to default if it is not populated. This ensures backwards compatibility after
    27  // the validation of the network mode was moved from the docker CLI to the
    28  // docker daemon.
    29  func SetDefaultNetModeIfBlank(hc *container.HostConfig) {
    30  	if hc != nil {
    31  		if hc.NetworkMode == container.NetworkMode("") {
    32  			hc.NetworkMode = container.NetworkMode("default")
    33  		}
    34  	}
    35  }
    36  
    37  // validateNetContainerMode ensures that the various combinations of requested
    38  // network settings wrt container mode are valid.
    39  func validateNetContainerMode(c *container.Config, hc *container.HostConfig) error {
    40  	// We may not be passed a host config, such as in the case of docker commit
    41  	if hc == nil {
    42  		return nil
    43  	}
    44  	parts := strings.Split(string(hc.NetworkMode), ":")
    45  	if parts[0] == "container" {
    46  		if len(parts) < 2 || parts[1] == "" {
    47  			return validationError("Invalid network mode: invalid container format container:<name|id>")
    48  		}
    49  	}
    50  
    51  	if hc.NetworkMode.IsContainer() && c.Hostname != "" {
    52  		return ErrConflictNetworkHostname
    53  	}
    54  
    55  	if hc.NetworkMode.IsContainer() && len(hc.Links) > 0 {
    56  		return ErrConflictContainerNetworkAndLinks
    57  	}
    58  
    59  	if hc.NetworkMode.IsContainer() && len(hc.DNS) > 0 {
    60  		return ErrConflictNetworkAndDNS
    61  	}
    62  
    63  	if hc.NetworkMode.IsContainer() && len(hc.ExtraHosts) > 0 {
    64  		return ErrConflictNetworkHosts
    65  	}
    66  
    67  	if (hc.NetworkMode.IsContainer() || hc.NetworkMode.IsHost()) && c.MacAddress != "" {
    68  		return ErrConflictContainerNetworkAndMac
    69  	}
    70  
    71  	if hc.NetworkMode.IsContainer() && (len(hc.PortBindings) > 0 || hc.PublishAllPorts) {
    72  		return ErrConflictNetworkPublishPorts
    73  	}
    74  
    75  	if hc.NetworkMode.IsContainer() && len(c.ExposedPorts) > 0 {
    76  		return ErrConflictNetworkExposePorts
    77  	}
    78  	return nil
    79  }