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: checkconnection.go
    path of file: ./repos/juju/cmd/jujud/agent
    
    the code of the file until where you have to start completion: // Copyright 2017 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.

package agent

import (
	"fmt"
	"io"

	"github.com/juju/cmd/v3"
	"github.com/juju/errors"
	"github.com/juju/loggo"
	"github
    
func (c *checkConnectionCommand) Init(args []string) error {
	if len(args) == 0 {
		return fmt.Errorf("agent-name argument is required%w", errors.Hide(agenterrors.FatalError))
	}
	agentName, args := args[0], args[1:]
	if err := cmd.CheckEmpty(args); err != nil {
		return err
	}
	tag, err := names.ParseTag(agentName)
	if err != nil {
		return errors.Annotatef(err, "agent-name")
	}
	if tag.Kind() != "machine" && tag.Kind() != "unit" {
		return fmt.Errorf("agent-name must be a machine or unit tag%w", errors.Hide(agenterrors.FatalError))
	}
	err = c.config.ReadConfig(agentName)
	if err != nil {
		return errors.Trace(err)
	}
	c.agentName = agentName
	return nil
}