// CheckAndPull checks whether a Docker image exists. If not, it pulls it.
func (h *Helper) CheckAndPull(image string, out io.Writer) error {
glog.V(5).Infof("Inspecting Docker image %q", image)
imageMeta, err := h.client.InspectImage(image)
if err == nil {
glog.V(5).Infof("Image %q found: %#v", image, imageMeta)
return nil
}
if err != docker.ErrNoSuchImage {
return starterrors.NewError("unexpected error inspecting image %s", image).WithCause(err)
}
glog.V(5).Infof("Image %q not found. Pulling", image)
fmt.Fprintf(out, "Pulling image %s\n", image)
logProgress := func(s string) {
fmt.Fprintf(out, "%s\n", s)
}
outputStream := imageprogress.NewPullWriter(logProgress)
if glog.V(5) {
outputStream = out
}
err = h.client.PullImage(docker.PullImageOptions{
Repository: image,
RawJSONStream: bool(!glog.V(5)),
OutputStream: outputStream,
}, docker.AuthConfiguration{})
if err != nil {
return starterrors.NewError("error pulling Docker image %s", image).WithCause(err)
}
fmt.Fprintf(out, "Image pull complete\n")
return nil
}
// LoadImage checks the client for an image matching from. If not found,
// attempts to pull the image and then tries to inspect again.
func (e *ClientExecutor) LoadImage(from string) (*docker.Image, error) {
image, err := e.Client.InspectImage(from)
if err == nil {
return image, nil
}
if err != docker.ErrNoSuchImage {
return nil, err
}
if !e.AllowPull {
glog.V(4).Infof("image %s did not exist", from)
return nil, docker.ErrNoSuchImage
}
repository, tag := docker.ParseRepositoryTag(from)
if len(tag) == 0 {
tag = "latest"
}
glog.V(4).Infof("attempting to pull %s with auth from repository %s:%s", from, repository, tag)
// TODO: we may want to abstract looping over multiple credentials
auth, _ := e.AuthFn(repository)
if len(auth) == 0 {
auth = append(auth, dockertypes.AuthConfig{})
}
if e.LogFn != nil {
e.LogFn("Image %s was not found, pulling ...", from)
}
var lastErr error
outputProgress := func(s string) {
e.LogFn("%s", s)
}
for _, config := range auth {
// TODO: handle IDs?
pullImageOptions := docker.PullImageOptions{
Repository: repository,
Tag: tag,
OutputStream: imageprogress.NewPullWriter(outputProgress),
RawJSONStream: true,
}
if glog.V(5) {
pullImageOptions.OutputStream = os.Stderr
pullImageOptions.RawJSONStream = false
}
authConfig := docker.AuthConfiguration{Username: config.Username, ServerAddress: config.ServerAddress, Password: config.Password}
if err = e.Client.PullImage(pullImageOptions, authConfig); err == nil {
break
}
lastErr = err
continue
}
if lastErr != nil {
return nil, fmt.Errorf("unable to pull image (from: %s, tag: %s): %v", repository, tag, lastErr)
}
return e.Client.InspectImage(from)
}
func pullImage(client DockerClient, name string, authConfig docker.AuthConfiguration) error {
logProgress := func(s string) {
glog.V(0).Infof("%s", s)
}
opts := docker.PullImageOptions{
Repository: name,
OutputStream: imageprogress.NewPullWriter(logProgress),
RawJSONStream: true,
}
if glog.Is(5) {
opts.OutputStream = os.Stderr
opts.RawJSONStream = false
}
err := client.PullImage(opts, authConfig)
if err == nil {
return nil
}
return err
}