docker-cli/components/engine/daemon/inspect.go

package daemon

import (
	"fmt"
	"time"

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

// ContainerInspect returns low-level information about a
// container. Returns an error if the container cannot be found, or if
// there is an error getting the data.
func (daemon *Daemon) ContainerInspect(name string) (*types.ContainerJSON, error) {
	container, err := daemon.Get(name)
	if err != nil {
		return nil, err
	}

	container.Lock()
	defer container.Unlock()

	base, err := daemon.getInspectData(container)
	if err != nil {
		return nil, err
	}

	mountPoints := addMountPoints(container)

	return &types.ContainerJSON{base, mountPoints, container.Config}, nil
}

// ContainerInspect120 serializes the master version of a container into a json type.
func (daemon *Daemon) ContainerInspect120(name string) (*types.ContainerJSON120, error) {
	container, err := daemon.Get(name)
	if err != nil {
		return nil, err
	}

	container.Lock()
	defer container.Unlock()

	base, err := daemon.getInspectData(container)
	if err != nil {
		return nil, err
	}

	mountPoints := addMountPoints(container)
	config := &types.ContainerConfig120{
		container.Config,
		container.hostConfig.VolumeDriver,
	}

	return &types.ContainerJSON120{base, mountPoints, config}, nil
}

func (daemon *Daemon) getInspectData(container *Container) (*types.ContainerJSONBase, error) {
	// make a copy to play with
	hostConfig := *container.hostConfig

	if children, err := daemon.children(container.Name); err == nil {
		for linkAlias, child := range children {
			hostConfig.Links = append(hostConfig.Links, fmt.Sprintf("%s:%s", child.Name, linkAlias))
		}
	}
	// we need this trick to preserve empty log driver, so
	// container will use daemon defaults even if daemon change them
	if hostConfig.LogConfig.Type == "" {
		hostConfig.LogConfig.Type = daemon.defaultLogConfig.Type
	}

	if len(hostConfig.LogConfig.Config) == 0 {
		hostConfig.LogConfig.Config = daemon.defaultLogConfig.Config
	}

	containerState := &types.ContainerState{
		Status:     container.State.StateString(),
		Running:    container.State.Running,
		Paused:     container.State.Paused,
		Restarting: container.State.Restarting,
		OOMKilled:  container.State.OOMKilled,
		Dead:       container.State.Dead,
		Pid:        container.State.Pid,
		ExitCode:   container.State.ExitCode,
		Error:      container.State.Error,
		StartedAt:  container.State.StartedAt.Format(time.RFC3339Nano),
		FinishedAt: container.State.FinishedAt.Format(time.RFC3339Nano),
	}

	contJSONBase := &types.ContainerJSONBase{
		ID:              container.ID,
		Created:         container.Created.Format(time.RFC3339Nano),
		Path:            container.Path,
		Args:            container.Args,
		State:           containerState,
		Image:           container.ImageID,
		NetworkSettings: container.NetworkSettings,
		LogPath:         container.LogPath,
		Name:            container.Name,
		RestartCount:    container.RestartCount,
		Driver:          container.Driver,
		ExecDriver:      container.ExecDriver,
		MountLabel:      container.MountLabel,
		ProcessLabel:    container.ProcessLabel,
		ExecIDs:         container.getExecIDs(),
		HostConfig:      &hostConfig,
	}

	// Now set any platform-specific fields
	contJSONBase = setPlatformSpecificContainerFields(container, contJSONBase)

	contJSONBase.GraphDriver.Name = container.Driver
	graphDriverData, err := daemon.driver.GetMetadata(container.ID)
	if err != nil {
		return nil, err
	}
	contJSONBase.GraphDriver.Data = graphDriverData

	return contJSONBase, nil
}

// ContainerExecInspect returns low-level information about the exec
// command. An error is returned if the exec cannot be found.
func (daemon *Daemon) ContainerExecInspect(id string) (*ExecConfig, error) {
	eConfig, err := daemon.getExecConfig(id)
	if err != nil {
		return nil, err
	}
	return eConfig, nil
}

// VolumeInspect looks up a volume by name. An error is returned if
// the volume cannot be found.
func (daemon *Daemon) VolumeInspect(name string) (*types.Volume, error) {
	v, err := daemon.volumes.Get(name)
	if err != nil {
		return nil, err
	}
	return volumeToAPIType(v), nil
}