func (builder *Builder) pushImage(image imagename.ImageName) (digest string, err error) {
var (
pipeReader, pipeWriter = io.Pipe()
errch = make(chan error)
buf bytes.Buffer
outStream = io.MultiWriter(pipeWriter, &buf)
)
go func() {
err := builder.Docker.PushImage(docker.PushImageOptions{
Name: image.NameWithRegistry(),
Tag: image.GetTag(),
Registry: image.Registry,
OutputStream: outStream,
RawJSONStream: true,
}, *builder.Auth)
if err := pipeWriter.Close(); err != nil {
fmt.Fprintf(builder.OutStream, "pipeWriter.Close() err: %s\n", err)
}
errch <- err
}()
if err := jsonmessage.DisplayJSONMessagesStream(pipeReader, builder.OutStream, builder.fdOut, builder.isTerminalOut); err != nil {
return "", fmt.Errorf("Failed to process json stream for image: %s, error: %s", image, err)
}
if err := <-errch; err != nil {
return "", fmt.Errorf("Failed to push image: %s, error: %s", image, err)
}
// It is the best way to have pushed image digest so far
matches := captureDigest.FindStringSubmatch(buf.String())
if len(matches) > 0 {
digest = matches[1]
}
return digest, nil
}
// lookupImage looks up for the image by name and returns *docker.Image object (result of the inspect)
// `Pull` config option defines whether we want to update the latest version of the image from the remote registry
// See build.Config struct for more details about other build config options.
//
// If `Pull` is false, it tries to lookup locally by exact matching, e.g. if the image is already
// pulled with that exact name given (no fuzzy semver matching)
//
// Then the function fetches the list of all pulled images and tries to match one of them by the given name.
//
// If `Pull` is set to true or if it cannot find the image locally, it then fetches all image
// tags from the remote registry and finds the best match for the given image name.
//
// If it cannot find the image either locally or in the remote registry, it returns `nil`
//
// In case the given image has sha256 tag, it looks for it locally and pulls if it's not found.
// No semver matching is done for sha256 tagged images.
//
// See also TestBuild_LookupImage_* test cases in build_test.go
func (b *Build) lookupImage(name string) (img *docker.Image, err error) {
var (
candidate, remoteCandidate *imagename.ImageName
imgName = imagename.NewFromString(name)
pull = false
hub = b.cfg.Pull
isSha = imgName.TagIsSha()
)
// If hub is true, then there is no sense to inspect the local image
if !hub || isSha {
// Try to inspect image as is, without version resolution
if img, err := b.client.InspectImage(name); err != nil || img != nil {
return img, err
}
}
if isSha {
// If we are still here and image not found locally, we want to pull it
candidate = imgName
hub = false
pull = true
}
if !isSha && !hub {
// List local images
var localImages = []*imagename.ImageName{}
if localImages, err = b.client.ListImages(); err != nil {
return nil, err
}
// Resolve local candidate
candidate = imgName.ResolveVersion(localImages)
}
// In case we want to include external images as well, pulling list of available
// images from the remote registry
if hub || candidate == nil {
log.Debugf("Getting list of tags for %s from the registry", imgName)
var remoteImages []*imagename.ImageName
if remoteImages, err = b.client.ListImageTags(imgName.String()); err != nil {
err = fmt.Errorf("Failed to list tags of image %s from the remote registry, error: %s", imgName, err)
}
// Since we found the remote image, we want to pull it
if remoteCandidate = imgName.ResolveVersion(remoteImages); remoteCandidate != nil {
pull = true
candidate = remoteCandidate
}
}
// If not candidate found, it's an error
if candidate == nil {
err = fmt.Errorf("Image not found: %s (also checked in the remote registry)", imgName)
return
}
if !isSha && imgName.GetTag() != candidate.GetTag() {
if remoteCandidate != nil {
log.Infof("Resolve %s --> %s (found remotely)", imgName, candidate.GetTag())
} else {
log.Infof("Resolve %s --> %s", imgName, candidate.GetTag())
}
}
if pull {
if err = b.client.PullImage(candidate.String()); err != nil {
return
}
}
return b.client.InspectImage(candidate.String())
}