CloudNative Pack项目典型实现代码走读

// Client is an orchestration object, it contains all parameters needed to
// build an app image using Cloud Native Buildpacks.
// All settings on this object should be changed through ClientOption functions.
type Client struct {
    logger logging.Logger
    docker dockerClient.CommonAPIClient
    
    keychain            authn.Keychain
    imageFactory        ImageFactory
    imageFetcher        ImageFetcher
    downloader          BlobDownloader
    lifecycleExecutor   LifecycleExecutor
    buildpackDownloader BuildpackDownloader
    
    experimental    bool
    registryMirrors map[string]string
    version         string
}

func initClient(logger logging.Logger, cfg config.Config) (*client.Client, error) {
	dc, err := tryInitSSHDockerClient()
	if err != nil {
		return nil, err
	}
	return client.NewClient(client.WithLogger(logger), client.WithExperimental(cfg.Experimental), client.WithRegistryMirrors(cfg.RegistryMirrors), client.WithDockerClient(dc))
}

// internal/commands/commands.go
type PackClient interface {
    InspectBuilder(string, bool, ...client.BuilderInspectionModifier) (*client.BuilderInfo, error)
    InspectImage(string, bool) (*client.ImageInfo, error)
    Rebase(context.Context, client.RebaseOptions) error
    CreateBuilder(context.Context, client.CreateBuilderOptions) error
    NewBuildpack(context.Context, client.NewBuildpackOptions) error
    PackageBuildpack(ctx context.Context, opts client.PackageBuildpackOptions) error
    Build(context.Context, client.BuildOptions) error
    RegisterBuildpack(context.Context, client.RegisterBuildpackOptions) error
    YankBuildpack(client.YankBuildpackOptions) error
    InspectBuildpack(client.InspectBuildpackOptions) (*client.BuildpackInfo, error)
    PullBuildpack(context.Context, client.PullBuildpackOptions) error
    DownloadSBOM(name string, options client.DownloadSBOMOptions) error
}

// pkg/client/client.go
// ImageFactory is an interface representing the ability to create a new OCI image.
type ImageFactory interface {
    // NewImage initializes an image object with required settings so that it
    // can be written either locally or to a registry.
    NewImage(repoName string, local bool, imageOS string) (imgutil.Image, error)
}

// pkg/client/client.go
type imageFactory struct {
    dockerClient dockerClient.CommonAPIClient
    keychain     authn.Keychain
}

func (f *imageFactory) NewImage(repoName string, daemon bool, imageOS string) (imgutil.Image, error) {
    platform := imgutil.Platform{OS: imageOS}

    if daemon {
        return local.NewImage(repoName, f.dockerClient, local.WithDefaultPlatform(platform))
    }

    return remote.NewImage(repoName, f.keychain, remote.WithDefaultPlatform(platform))
}