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moby--moby/daemon/image_inspect.go

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package daemon
import (
"fmt"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/layer"
"github.com/docker/docker/reference"
)
// LookupImage looks up an image by name and returns it as an ImageInspect
// structure.
func (daemon *Daemon) LookupImage(name string) (*types.ImageInspect, error) {
img, err := daemon.GetImage(name)
if err != nil {
return nil, fmt.Errorf("No such image: %s", name)
}
refs := daemon.referenceStore.References(img.ID().Digest())
repoTags := []string{}
repoDigests := []string{}
for _, ref := range refs {
switch ref.(type) {
case reference.NamedTagged:
repoTags = append(repoTags, ref.String())
case reference.Canonical:
repoDigests = append(repoDigests, ref.String())
}
}
var size int64
var layerMetadata map[string]string
layerID := img.RootFS.ChainID()
if layerID != "" {
l, err := daemon.layerStore.Get(layerID)
if err != nil {
return nil, err
}
defer layer.ReleaseAndLog(daemon.layerStore, l)
size, err = l.Size()
if err != nil {
return nil, err
}
layerMetadata, err = l.Metadata()
if err != nil {
return nil, err
}
}
comment := img.Comment
if len(comment) == 0 && len(img.History) > 0 {
comment = img.History[len(img.History)-1].Comment
}
imageInspect := &types.ImageInspect{
ID: img.ID().String(),
RepoTags: repoTags,
RepoDigests: repoDigests,
Parent: img.Parent.String(),
Comment: comment,
Created: img.Created.Format(time.RFC3339Nano),
Container: img.Container,
ContainerConfig: &img.ContainerConfig,
DockerVersion: img.DockerVersion,
Author: img.Author,
Config: img.Config,
Architecture: img.Architecture,
Os: img.OS,
OsVersion: img.OSVersion,
Size: size,
VirtualSize: size, // TODO: field unused, deprecate
RootFS: rootFSToAPIType(img.RootFS),
}
imageInspect.GraphDriver.Name = daemon.GraphDriverName()
imageInspect.GraphDriver.Data = layerMetadata
return imageInspect, nil
}