Method ensureNetwork

pkg/compose/create.go:1319–1331

(ctx context.Context, project *types.Project, name string, n *types.NetworkConfig)

}

func (s *composeService) ensureNetwork(ctx context.Context, project *types.Project, name string, n *types.NetworkConfig) (string, error) {
	if n.External {
		return s.resolveExternalNetwork(ctx, n)
	}

	id, err := s.resolveOrCreateNetwork(ctx, project, name, n)
	if errdefs.IsConflict(err) {
		// Maybe another execution of `docker compose up|run` created same network
		// let's retry once
		return s.resolveOrCreateNetwork(ctx, project, name, n)
	}
	return id, err
}

func (s *composeService) resolveOrCreateNetwork(ctx context.Context, project *types.Project, name string, n *types.NetworkConfig) (string, error) { //nolint:gocyclo
	// This is containers that could be left after a diverged network was removed