Function Parse

pkg/composer/serviceparser/serviceparser.go:437–490

(project *types.Project, svc types.ServiceConfig)

}

func Parse(project *types.Project, svc types.ServiceConfig) (*Service, error) {
	warnUnknownFields(svc)

	replicas, err := getReplicas(svc)
	if err != nil {
		return nil, err
	}

	parsed := &Service{
		Image:      svc.Image,
		PullMode:   "missing",
		Containers: make([]Container, replicas),
		Unparsed:   &svc,
	}

	if svc.Build == nil {
		if parsed.Image == "" {
			return nil, fmt.Errorf("service %s: missing image", svc.Name)
		}
	} else {
		if parsed.Image == "" {
			parsed.Image = DefaultImageName(project.Name, svc.Name)
		}
		parsed.Build, err = parseBuildConfig(svc.Build, project, parsed.Image)
		if err != nil {
			return nil, fmt.Errorf("service %s: failed to parse build: %w", svc.Name, err)
		}
	}

	switch svc.PullPolicy {
	case "", types.PullPolicyMissing, types.PullPolicyIfNotPresent:
		// NOP
	case types.PullPolicyAlways, types.PullPolicyNever:
		parsed.PullMode = svc.PullPolicy
	case types.PullPolicyBuild:
		if parsed.Build == nil {
			return nil, fmt.Errorf("service %s: pull_policy \"build\" requires build config", svc.Name)
		}
		parsed.Build.Force = true
		parsed.PullMode = "never"
	default:
		return nil, fmt.Errorf("invalid --pull option %q", svc.PullPolicy)
	}

	for i := 0; i < replicas; i++ {
		container, err := newContainer(project, parsed, i)
		if err != nil {
			return nil, err
		}
		parsed.Containers[i] = *container
	}

	return parsed, nil
}

func newContainer(project *types.Project, parsed *Service, i int) (*Container, error) {
	svc := *parsed.Unparsed