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: dotfiles.go
    path of file: ./repos/coder/cli
    
    the code of the file until where you have to start completion: package cli

import (
	"bytes"
	"errors"
	"fmt"
	"io/fs"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"time"

	"golang.org/x/xerrors"

	"github.com/coder/pretty"

	"github.com/coder/coder/v2/cli/clibase"
	"github.com/coder/coder/v2/cli/cliui"
)

func (r *RootCmd) dotfiles() *clibase.Cmd {
	var symlinkDir string
	var gitbranch string
	var dotfilesRepoDir string

	cmd := &clibase.Cmd{
		Use:        "dotfiles <git_repo_url>",
		Middleware: clibase.RequireNArgs(1),
		Short:      "Personalize your workspace by applying a canonical dotfiles repository",
		Long: formatExamples(
			example{
				Description: "Check out and install a dotfiles repository without prompts",
				Command:   
    
func ensureCorrectGitBranch(baseInv *clibase.Invocation, params ensureCorrectGitBranchParams) error {
	dotfileCmd := func(cmd string, args ...string) *exec.Cmd {
		c := exec.CommandContext(baseInv.Context(), cmd, args...)
		c.Dir = params.repoDir
		c.Env = append(baseInv.Environ.ToOS(), fmt.Sprintf(`GIT_SSH_COMMAND=%s -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no`, params.gitSSHCommand))
		c.Stdout = baseInv.Stdout
		c.Stderr = baseInv.Stderr
		return c
	}
	c := dotfileCmd("git", "branch", "--show-current")
	// Save the output
	var out bytes.Buffer
	c.Stdout = &out
	err := c.Run()
	if err != nil {
		return xerrors.Errorf("getting current git branch: %w", err)
	}

	if strings.TrimSpace(out.String()) != params.gitBranch {
		// Checkout and pull the branch
		c := dotfileCmd("git", "checkout", params.gitBranch)
		err := c.Run()
		if err != nil {
			return xerrors.Errorf("checkout git branch %q: %w", params.gitBranch, err)
		}

		c = dotfileCmd("git", "pull", "--ff-only")
		err = c.Run()
		if err != nil {
			return xerrors.Errorf("pull git branch %q: %w", params.gitBranch, err)
		}
	}
	return nil
}