pack build 과정 팔로업

pack\internal\build\lifecycle_execution.go

func (l *LifecycleExecution) Run(ctx context.Context, phaseFactoryCreator PhaseFactoryCreator) error {
	phaseFactory := phaseFactoryCreator(l)
	var buildCache Cache
	if l.opts.CacheImage != "" {
		cacheImage, err := name.ParseReference(l.opts.CacheImage, name.WeakValidation)
		if err != nil {
			return fmt.Errorf("invalid cache image name: %s", err)
		}
		buildCache = cache.NewImageCache(cacheImage, l.docker)
	} else {
		buildCache = cache.NewVolumeCache(l.opts.Image, "build", l.docker)
	}

	l.logger.Debugf("Using build cache volume %s", style.Symbol(buildCache.Name()))
	if l.opts.ClearCache {
		if err := buildCache.Clear(ctx); err != nil {
			return errors.Wrap(err, "clearing build cache")
		}
		l.logger.Debugf("Build cache %s cleared", style.Symbol(buildCache.Name()))
	}

	launchCache := cache.NewVolumeCache(l.opts.Image, "launch", l.docker)

	if !l.opts.UseCreator {
		l.logger.Info(style.Step("DETECTING"))
		if err := l.Detect(ctx, l.opts.Network, l.opts.Volumes, phaseFactory); err != nil {
			return err
		}

		l.logger.Info(style.Step("ANALYZING"))
		if err := l.Analyze(ctx, l.opts.Image.String(), l.opts.Network, l.opts.Publish, l.opts.DockerHost, l.opts.ClearCache, buildCache, phaseFactory); err != nil {
			return err
		}

		l.logger.Info(style.Step("RESTORING"))
		if l.opts.ClearCache {
			l.logger.Info("Skipping 'restore' due to clearing cache")
		} else if err := l.Restore(ctx, l.opts.Network, buildCache, phaseFactory); err != nil {
			return err
		}

		l.logger.Info(style.Step("BUILDING"))

		if err := l.Build(ctx, l.opts.Network, l.opts.Volumes, phaseFactory); err != nil {
			return err
		}

		l.logger.Info(style.Step("EXPORTING"))
		return l.Export(ctx, l.opts.Image.String(), l.opts.RunImage, l.opts.Publish, l.opts.DockerHost, l.opts.Network, buildCache, launchCache, l.opts.AdditionalTags, phaseFactory)
	}

	return l.Create(ctx, l.opts.Publish, l.opts.DockerHost, l.opts.ClearCache, l.opts.RunImage, l.opts.Image.String(), l.opts.Network, buildCache, launchCache, l.opts.AdditionalTags, l.opts.Volumes, phaseFactory)
}