package runconfig import ( "encoding/json" "fmt" "io" "github.com/docker/docker/api/types/container" "github.com/docker/docker/volume" ) // DecodeContainerConfig decodes a json encoded config into a ContainerConfigWrapper // struct and returns both a Config and an HostConfig struct // Be aware this function is not checking whether the resulted structs are nil, // it's your business to do so func DecodeContainerConfig(src io.Reader) (*container.Config, *container.HostConfig, error) { var w ContainerConfigWrapper decoder := json.NewDecoder(src) if err := decoder.Decode(&w); err != nil { return nil, nil, err } hc := w.getHostConfig() // Perform platform-specific processing of Volumes and Binds. if w.Config != nil && hc != nil { // Initialize the volumes map if currently nil if w.Config.Volumes == nil { w.Config.Volumes = make(map[string]struct{}) } // Now validate all the volumes and binds if err := validateVolumesAndBindSettings(w.Config, hc); err != nil { return nil, nil, err } } // Certain parameters need daemon-side validation that cannot be done // on the client, as only the daemon knows what is valid for the platform. if err := ValidateNetMode(w.Config, hc); err != nil { return nil, nil, err } // Validate the isolation level if err := ValidateIsolationLevel(hc); err != nil { return nil, nil, err } return w.Config, hc, nil } // validateVolumesAndBindSettings validates each of the volumes and bind settings // passed by the caller to ensure they are valid. func validateVolumesAndBindSettings(c *container.Config, hc *container.HostConfig) error { // Ensure all volumes and binds are valid. for spec := range c.Volumes { if _, err := volume.ParseMountSpec(spec, hc.VolumeDriver); err != nil { return fmt.Errorf("Invalid volume spec %q: %v", spec, err) } } for _, spec := range hc.Binds { if _, err := volume.ParseMountSpec(spec, hc.VolumeDriver); err != nil { return fmt.Errorf("Invalid bind mount spec %q: %v", spec, err) } } return nil }