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: rpm.go
    path of file: ./repos/trivy/pkg/fanal/analyzer/pkg/rpm
    
    the code of the file until where you have to start completion: package rpm

import (
	"context"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"sort"
	"strings"

	rpmdb "github.com/knqyf263/go-rpmdb/pkg"
	"github.com/samber/lo"
	"golang.org/x/exp/slic
    
func writeToTempFile(rc io.Reader) (string, error) {
	tmpDir, err := os.MkdirTemp("", "rpm")
	if err != nil {
		return "", xerrors.Errorf("failed to create a temp dir: %w", err)
	}

	filePath := filepath.Join(tmpDir, "Packages")
	f, err := os.Create(filePath)
	if err != nil {
		return "", xerrors.Errorf("failed to create a package file: %w", err)
	}

	if _, err = io.Copy(f, rc); err != nil {
		return "", xerrors.Errorf("failed to copy a package file: %w", err)
	}

	// The temp file must be closed before being opened as Berkeley DB.
	if err = f.Close(); err != nil {
		return "", xerrors.Errorf("failed to close a temp file: %w", err)
	}

	return filePath, nil
}