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: providers_mirror.go
    path of file: ./repos/terraform/internal/command
    
    the code of the file until where you have to start completion: // Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1

package command

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/url"
	"os"
	"path/filepath"

	"github.com/apparentlymart/go-versions/versions"
	"github.com/hashicorp/go-getter"
	"github.com/hashicorp/terraform/internal/getproviders"
	"github.com/hashicorp/terraform/internal/httpclient"
	"github.com/hashicorp/terraform/internal/tfdiags"
)

// ProvidersMirrorCommand is a Command implementation that implements the
// "terraform providers mirror" command, which populates a directory with
// local copies of provider plugins needed by the current configuration so
// that the mirror can be used to work offline, or similar.
type ProvidersMirrorCommand struct {
	Meta
}

func (c *ProvidersMirrorCommand) Synopsis() string {
	return "Save local copies of all required provider plugins"
}

func (c *ProvidersMirrorCommand) Run(args []string) int {
	args = c.Meta.pr
    
func (c *ProvidersMirrorCommand) Help() string {
	return `
Usage: terraform [global options] providers mirror [options] <target-dir>

  Populates a local directory with copies of the provider plugins needed for
  the current configuration, so that the directory can be used either directly
  as a filesystem mirror or as the basis for a network mirror and thus obtain
  those providers without access to their origin registries in future.

  The mirror directory will contain JSON index files that can be published
  along with the mirrored packages on a static HTTP file server to produce
  a network mirror. Those index files will be ignored if the directory is
  used instead as a local filesystem mirror.

Options:

  -platform=os_arch  Choose which target platform to build a mirror for.
                     By default Terraform will obtain plugin packages
                     suitable for the platform where you run this command.
                     Use this flag multiple times to include packages for
                     multiple target systems.

                     Target names consist of an operating system and a CPU
                     architecture. For example, "linux_amd64" selects the
                     Linux operating system running on an AMD64 or x86_64
                     CPU. Each provider is available only for a limited
                     set of target platforms.
`
}