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moby--moby/graph/service.go
Aaron Lehmann d4836cd7ec Documentation improvements and code cleanups for graph package
Expand the godoc documentation for the graph package.

Centralize DefaultTag in the graphs/tag package instead of defining it
twice.

Remove some unnecessary "config" structs that are only used to pass
a few parameters to a function.

Simplify the GetParentsSize function - there's no reason for it to take
an accumulator argument.

Unexport some functions that aren't needed outside the package.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
2015-07-30 14:27:10 -07:00

84 lines
2.2 KiB
Go

package graph
import (
"fmt"
"io"
"runtime"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
)
// lookupRaw looks up an image by name in a TagStore and returns the raw JSON
// describing the image.
func (s *TagStore) lookupRaw(name string) ([]byte, error) {
image, err := s.LookupImage(name)
if err != nil || image == nil {
return nil, fmt.Errorf("No such image %s", name)
}
imageInspectRaw, err := s.graph.RawJSON(image.ID)
if err != nil {
return nil, err
}
return imageInspectRaw, nil
}
// Lookup looks up an image by name in a TagStore and returns it as an
// ImageInspect structure.
func (s *TagStore) Lookup(name string) (*types.ImageInspect, error) {
image, err := s.LookupImage(name)
if err != nil || image == nil {
return nil, fmt.Errorf("No such image: %s", name)
}
imageInspect := &types.ImageInspect{
Id: image.ID,
Parent: image.Parent,
Comment: image.Comment,
Created: image.Created.Format(time.RFC3339Nano),
Container: image.Container,
ContainerConfig: &image.ContainerConfig,
DockerVersion: image.DockerVersion,
Author: image.Author,
Config: image.Config,
Architecture: image.Architecture,
Os: image.OS,
Size: image.Size,
VirtualSize: s.graph.GetParentsSize(image) + image.Size,
}
imageInspect.GraphDriver.Name = s.graph.driver.String()
graphDriverData, err := s.graph.driver.GetMetadata(image.ID)
if err != nil {
return nil, err
}
imageInspect.GraphDriver.Data = graphDriverData
return imageInspect, nil
}
// ImageTarLayer return the tarLayer of the image
func (s *TagStore) ImageTarLayer(name string, dest io.Writer) error {
if image, err := s.LookupImage(name); err == nil && image != nil {
// On Windows, the base layer cannot be exported
if runtime.GOOS != "windows" || image.Parent != "" {
fs, err := s.graph.TarLayer(image)
if err != nil {
return err
}
defer fs.Close()
written, err := io.Copy(dest, fs)
if err != nil {
return err
}
logrus.Debugf("rendered layer for %s of [%d] size", image.ID, written)
}
return nil
}
return fmt.Errorf("No such image: %s", name)
}