0e1b1cc04e
These methods rely on an ObjectStore interface, which is meant to approximate the storage behavior of the docker engine. This is very much subject to change.
95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
package client
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import (
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"bytes"
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"crypto/sha1"
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"io"
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"io/ioutil"
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"github.com/docker/docker-registry"
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log "github.com/Sirupsen/logrus"
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)
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// Push implements a client push workflow for the image defined by the given
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// name and tag pair, using the given ObjectStore for local manifest and layer
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// storage
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func Push(c Client, objectStore ObjectStore, name, tag string) error {
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manifest, err := objectStore.Manifest(name, tag)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"name": name,
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"tag": tag,
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}).Info("No image found")
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return err
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}
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for _, fsLayer := range manifest.FSLayers {
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layer, err := objectStore.Layer(fsLayer.BlobSum)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to read local layer")
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return err
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}
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layerReader, err := layer.Reader()
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to read local layer")
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return err
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}
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location, err := c.InitiateLayerUpload(name, fsLayer.BlobSum)
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if _, ok := err.(*registry.LayerAlreadyExistsError); ok {
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log.WithField("layer", fsLayer).Info("Layer already exists")
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continue
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}
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to upload layer")
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return err
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}
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layerBuffer := new(bytes.Buffer)
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checksum := sha1.New()
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teeReader := io.TeeReader(layerReader, checksum)
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_, err = io.Copy(layerBuffer, teeReader)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to read local layer")
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return err
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}
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err = c.UploadLayer(location, ioutil.NopCloser(layerBuffer), layerBuffer.Len(),
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®istry.Checksum{HashAlgorithm: "sha1", Sum: string(checksum.Sum(nil))},
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)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to upload layer")
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return err
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}
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}
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err = c.PutImageManifest(name, tag, manifest)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"manifest": manifest,
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}).Warn("Unable to upload manifest")
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return err
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}
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return nil
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}
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