You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: registry.go
    path of file: ./repos/k3s/pkg/spegel
    
    the code of the file until where you have to start completion: package spegel

import (
	"net"

	"github.com/containerd/containerd/remotes/docker"
	"github.com/k3s-io/k3s/pkg/daemons/config"
	"github.com/rancher/wharfie/pkg/registries"
)

// InjectMirror configures TLS for the registry mirror client, and  adds the mirror address as an endpoint
// to all configured registries.
func (c *Config) InjectMirror(nodeConfig *config.Node) error {
	mirrorAddr := net.JoinHostPort(c.InternalAddress, c.RegistryPort)
	mirrorURL := "https://" + mirrorAddr + "/v2"
	r
    
func (c *Config) InjectMirror(nodeConfig *config.Node) error {
	mirrorAddr := net.JoinHostPort(c.InternalAddress, c.RegistryPort)
	mirrorURL := "https://" + mirrorAddr + "/v2"
	registry := nodeConfig.AgentConfig.Registry

	if registry.Configs == nil {
		registry.Configs = map[string]registries.RegistryConfig{}
	}
	registry.Configs[mirrorAddr] = registries.RegistryConfig{
		TLS: &registries.TLSConfig{
			CAFile:   c.ServerCAFile,
			CertFile: c.ClientCertFile,
			KeyFile:  c.ClientKeyFile,
		},
	}

	if registry.Mirrors == nil {
		registry.Mirrors = map[string]registries.Mirror{}
	}
	for host, mirror := range registry.Mirrors {
		// Don't handle local registry entries
		if !docker.IsLocalhost(host) {
			mirror.Endpoints = append([]string{mirrorURL}, mirror.Endpoints...)
			registry.Mirrors[host] = mirror
		}
	}
	registry.Mirrors[mirrorAddr] = registries.Mirror{
		Endpoints: []string{mirrorURL},
	}

	return nil
}