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moby--moby/distribution/push_v2.go
Aaron Lehmann 694df3ff9f Add distribution package
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
2015-11-24 09:40:24 -08:00

410 lines
11 KiB
Go

package distribution
import (
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/distribution"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/distribution/manifest/schema1"
"github.com/docker/distribution/reference"
"github.com/docker/docker/distribution/metadata"
"github.com/docker/docker/image"
"github.com/docker/docker/image/v1"
"github.com/docker/docker/layer"
"github.com/docker/docker/pkg/progressreader"
"github.com/docker/docker/pkg/streamformatter"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/registry"
"github.com/docker/docker/tag"
"golang.org/x/net/context"
)
type v2Pusher struct {
blobSumService *metadata.BlobSumService
ref reference.Named
endpoint registry.APIEndpoint
repoInfo *registry.RepositoryInfo
config *ImagePushConfig
sf *streamformatter.StreamFormatter
repo distribution.Repository
// layersPushed is the set of layers known to exist on the remote side.
// This avoids redundant queries when pushing multiple tags that
// involve the same layers.
layersPushed map[digest.Digest]bool
}
func (p *v2Pusher) Push() (fallback bool, err error) {
p.repo, err = NewV2Repository(p.repoInfo, p.endpoint, p.config.MetaHeaders, p.config.AuthConfig, "push", "pull")
if err != nil {
logrus.Debugf("Error getting v2 registry: %v", err)
return true, err
}
localName := p.repoInfo.LocalName.Name()
var associations []tag.Association
if _, isTagged := p.ref.(reference.Tagged); isTagged {
imageID, err := p.config.TagStore.Get(p.ref)
if err != nil {
return false, fmt.Errorf("tag does not exist: %s", p.ref.String())
}
associations = []tag.Association{
{
Ref: p.ref,
ImageID: imageID,
},
}
} else {
// Pull all tags
associations = p.config.TagStore.ReferencesByName(p.ref)
}
if err != nil {
return false, fmt.Errorf("error getting tags for %s: %s", localName, err)
}
if len(associations) == 0 {
return false, fmt.Errorf("no tags to push for %s", localName)
}
for _, association := range associations {
if err := p.pushV2Tag(association); err != nil {
return false, err
}
}
return false, nil
}
func (p *v2Pusher) pushV2Tag(association tag.Association) error {
ref := association.Ref
logrus.Debugf("Pushing repository: %s", ref.String())
img, err := p.config.ImageStore.Get(association.ImageID)
if err != nil {
return fmt.Errorf("could not find image from tag %s: %v", ref.String(), err)
}
out := p.config.OutStream
var l layer.Layer
topLayerID := img.RootFS.ChainID()
if topLayerID == "" {
l = layer.EmptyLayer
} else {
l, err = p.config.LayerStore.Get(topLayerID)
if err != nil {
return fmt.Errorf("failed to get top layer from image: %v", err)
}
defer layer.ReleaseAndLog(p.config.LayerStore, l)
}
fsLayers := make(map[layer.DiffID]schema1.FSLayer)
// Push empty layer if necessary
for _, h := range img.History {
if h.EmptyLayer {
dgst, err := p.pushLayerIfNecessary(out, layer.EmptyLayer)
if err != nil {
return err
}
p.layersPushed[dgst] = true
fsLayers[layer.EmptyLayer.DiffID()] = schema1.FSLayer{BlobSum: dgst}
break
}
}
for i := 0; i < len(img.RootFS.DiffIDs); i++ {
dgst, err := p.pushLayerIfNecessary(out, l)
if err != nil {
return err
}
p.layersPushed[dgst] = true
fsLayers[l.DiffID()] = schema1.FSLayer{BlobSum: dgst}
l = l.Parent()
}
var tag string
if tagged, isTagged := ref.(reference.Tagged); isTagged {
tag = tagged.Tag()
}
m, err := CreateV2Manifest(p.repo.Name(), tag, img, fsLayers)
if err != nil {
return err
}
logrus.Infof("Signed manifest for %s using daemon's key: %s", ref.String(), p.config.TrustKey.KeyID())
signed, err := schema1.Sign(m, p.config.TrustKey)
if err != nil {
return err
}
manifestDigest, manifestSize, err := digestFromManifest(signed, p.repo.Name())
if err != nil {
return err
}
if manifestDigest != "" {
if tagged, isTagged := ref.(reference.Tagged); isTagged {
// NOTE: do not change this format without first changing the trust client
// code. This information is used to determine what was pushed and should be signed.
out.Write(p.sf.FormatStatus("", "%s: digest: %s size: %d", tagged.Tag(), manifestDigest, manifestSize))
}
}
manSvc, err := p.repo.Manifests(context.Background())
if err != nil {
return err
}
return manSvc.Put(signed)
}
func (p *v2Pusher) pushLayerIfNecessary(out io.Writer, l layer.Layer) (digest.Digest, error) {
logrus.Debugf("Pushing layer: %s", l.DiffID())
// Do we have any blobsums associated with this layer's DiffID?
possibleBlobsums, err := p.blobSumService.GetBlobSums(l.DiffID())
if err == nil {
dgst, exists, err := p.blobSumAlreadyExists(possibleBlobsums)
if err != nil {
out.Write(p.sf.FormatProgress(stringid.TruncateID(string(l.DiffID())), "Image push failed", nil))
return "", err
}
if exists {
out.Write(p.sf.FormatProgress(stringid.TruncateID(string(l.DiffID())), "Layer already exists", nil))
return dgst, nil
}
}
// if digest was empty or not saved, or if blob does not exist on the remote repository,
// then push the blob.
pushDigest, err := p.pushV2Layer(p.repo.Blobs(context.Background()), l)
if err != nil {
return "", err
}
// Cache mapping from this layer's DiffID to the blobsum
if err := p.blobSumService.Add(l.DiffID(), pushDigest); err != nil {
return "", err
}
return pushDigest, nil
}
// blobSumAlreadyExists checks if the registry already know about any of the
// blobsums passed in the "blobsums" slice. If it finds one that the registry
// knows about, it returns the known digest and "true".
func (p *v2Pusher) blobSumAlreadyExists(blobsums []digest.Digest) (digest.Digest, bool, error) {
for _, dgst := range blobsums {
if p.layersPushed[dgst] {
// it is already known that the push is not needed and
// therefore doing a stat is unnecessary
return dgst, true, nil
}
_, err := p.repo.Blobs(context.Background()).Stat(context.Background(), dgst)
switch err {
case nil:
return dgst, true, nil
case distribution.ErrBlobUnknown:
// nop
default:
return "", false, err
}
}
return "", false, nil
}
// CreateV2Manifest creates a V2 manifest from an image config and set of
// FSLayer digests.
// FIXME: This should be moved to the distribution repo, since it will also
// be useful for converting new manifests to the old format.
func CreateV2Manifest(name, tag string, img *image.Image, fsLayers map[layer.DiffID]schema1.FSLayer) (*schema1.Manifest, error) {
if len(img.History) == 0 {
return nil, errors.New("empty history when trying to create V2 manifest")
}
// Generate IDs for each layer
// For non-top-level layers, create fake V1Compatibility strings that
// fit the format and don't collide with anything else, but don't
// result in runnable images on their own.
type v1Compatibility struct {
ID string `json:"id"`
Parent string `json:"parent,omitempty"`
Comment string `json:"comment,omitempty"`
Created time.Time `json:"created"`
ContainerConfig struct {
Cmd []string
} `json:"container_config,omitempty"`
ThrowAway bool `json:"throwaway,omitempty"`
}
fsLayerList := make([]schema1.FSLayer, len(img.History))
history := make([]schema1.History, len(img.History))
parent := ""
layerCounter := 0
for i, h := range img.History {
if i == len(img.History)-1 {
break
}
var diffID layer.DiffID
if h.EmptyLayer {
diffID = layer.EmptyLayer.DiffID()
} else {
if len(img.RootFS.DiffIDs) <= layerCounter {
return nil, errors.New("too many non-empty layers in History section")
}
diffID = img.RootFS.DiffIDs[layerCounter]
layerCounter++
}
fsLayer, present := fsLayers[diffID]
if !present {
return nil, fmt.Errorf("missing layer in CreateV2Manifest: %s", diffID.String())
}
dgst, err := digest.FromBytes([]byte(fsLayer.BlobSum.Hex() + " " + parent))
if err != nil {
return nil, err
}
v1ID := dgst.Hex()
v1Compatibility := v1Compatibility{
ID: v1ID,
Parent: parent,
Comment: h.Comment,
Created: h.Created,
}
v1Compatibility.ContainerConfig.Cmd = []string{img.History[i].CreatedBy}
if h.EmptyLayer {
v1Compatibility.ThrowAway = true
}
jsonBytes, err := json.Marshal(&v1Compatibility)
if err != nil {
return nil, err
}
reversedIndex := len(img.History) - i - 1
history[reversedIndex].V1Compatibility = string(jsonBytes)
fsLayerList[reversedIndex] = fsLayer
parent = v1ID
}
latestHistory := img.History[len(img.History)-1]
var diffID layer.DiffID
if latestHistory.EmptyLayer {
diffID = layer.EmptyLayer.DiffID()
} else {
if len(img.RootFS.DiffIDs) <= layerCounter {
return nil, errors.New("too many non-empty layers in History section")
}
diffID = img.RootFS.DiffIDs[layerCounter]
}
fsLayer, present := fsLayers[diffID]
if !present {
return nil, fmt.Errorf("missing layer in CreateV2Manifest: %s", diffID.String())
}
dgst, err := digest.FromBytes([]byte(fsLayer.BlobSum.Hex() + " " + parent + " " + string(img.RawJSON())))
if err != nil {
return nil, err
}
fsLayerList[0] = fsLayer
// Top-level v1compatibility string should be a modified version of the
// image config.
transformedConfig, err := v1.MakeV1ConfigFromConfig(img, dgst.Hex(), parent, latestHistory.EmptyLayer)
if err != nil {
return nil, err
}
history[0].V1Compatibility = string(transformedConfig)
// windows-only baselayer setup
if err := setupBaseLayer(history, *img.RootFS); err != nil {
return nil, err
}
return &schema1.Manifest{
Versioned: manifest.Versioned{
SchemaVersion: 1,
},
Name: name,
Tag: tag,
Architecture: img.Architecture,
FSLayers: fsLayerList,
History: history,
}, nil
}
func rawJSON(value interface{}) *json.RawMessage {
jsonval, err := json.Marshal(value)
if err != nil {
return nil
}
return (*json.RawMessage)(&jsonval)
}
func (p *v2Pusher) pushV2Layer(bs distribution.BlobService, l layer.Layer) (digest.Digest, error) {
out := p.config.OutStream
displayID := stringid.TruncateID(string(l.DiffID()))
out.Write(p.sf.FormatProgress(displayID, "Preparing", nil))
arch, err := l.TarStream()
if err != nil {
return "", err
}
// Send the layer
layerUpload, err := bs.Create(context.Background())
if err != nil {
return "", err
}
defer layerUpload.Close()
// don't care if this fails; best effort
size, _ := l.DiffSize()
reader := progressreader.New(progressreader.Config{
In: ioutil.NopCloser(arch), // we'll take care of close here.
Out: out,
Formatter: p.sf,
Size: size,
NewLines: false,
ID: displayID,
Action: "Pushing",
})
compressedReader := compress(reader)
digester := digest.Canonical.New()
tee := io.TeeReader(compressedReader, digester.Hash())
out.Write(p.sf.FormatProgress(displayID, "Pushing", nil))
nn, err := layerUpload.ReadFrom(tee)
compressedReader.Close()
if err != nil {
return "", err
}
dgst := digester.Digest()
if _, err := layerUpload.Commit(context.Background(), distribution.Descriptor{Digest: dgst}); err != nil {
return "", err
}
logrus.Debugf("uploaded layer %s (%s), %d bytes", l.DiffID(), dgst, nn)
out.Write(p.sf.FormatProgress(displayID, "Pushed", nil))
return dgst, nil
}