func RootCommand() *commander.Command {
	cmd := &commander.Command{
		UsageLine: os.Args[0],
		Short:     "Debian repository management tool",
		Long: `
aptly is a tool to create partial and full mirrors of remote
repositories, manage local repositories, filter them, merge,
upgrade individual packages, take snapshots and publish them
back as Debian repositories.
aptly's goal is to establish repeatability and controlled changes
in a package-centric environment. aptly allows one to fix a set of packages
in a repository, so that package installation and upgrade becomes
deterministic. At the same time aptly allows one to perform controlled,
fine-grained changes in repository contents to transition your
package environment to new version.`,
		Flag: *flag.NewFlagSet("aptly", flag.ExitOnError),
		Subcommands: []*commander.Command{
			makeCmdConfig(),
			makeCmdDb(),
			makeCmdGraph(),
			makeCmdMirror(),
			makeCmdRepo(),
			makeCmdServe(),
			makeCmdSnapshot(),
			makeCmdTask(),
			makeCmdPublish(),
			makeCmdVersion(),
			makeCmdPackage(),
			makeCmdAPI(),
		},
	}
	cmd.Flag.Int("db-open-attempts", 10, "number of attempts to open DB if it's locked by other instance")
	cmd.Flag.Bool("dep-follow-suggests", false, "when processing dependencies, follow Suggests")
	cmd.Flag.Bool("dep-follow-source", false, "when processing dependencies, follow from binary to Source packages")
	cmd.Flag.Bool("dep-follow-recommends", false, "when processing dependencies, follow Recommends")
	cmd.Flag.Bool("dep-follow-all-variants", false, "when processing dependencies, follow a & b if dependency is 'a|b'")
	cmd.Flag.Bool("dep-verbose-resolve", false, "when processing dependencies, print detailed logs")
	cmd.Flag.String("architectures", "", "list of architectures to consider during (comma-separated), default to all available")
	cmd.Flag.String("config", "", "location of configuration file (default locations are /etc/aptly.conf, ~/.aptly.conf)")
	cmd.Flag.String("gpg-provider", "", "PGP implementation (\"gpg\", \"gpg1\", \"gpg2\" for external gpg or \"internal\" for Go internal implementation)")
	if aptly.EnableDebug {
		cmd.Flag.String("cpuprofile", "", "write cpu profile to file")
		cmd.Flag.String("memprofile", "", "write memory profile to this file")
		cmd.Flag.String("memstats", "", "write memory stats periodically to this file")
		cmd.Flag.Duration("meminterval", 100*time.Millisecond, "memory stats dump interval")
	}
	return cmd
}
RootCommand creates root command in command tree
package cmd
import (
	"bytes"
	"fmt"
	"os"
	"text/template"
	"time"
	"github.com/aptly-dev/aptly/aptly"
	"github.com/aptly-dev/aptly/deb"
	"github.com/smira/commander"
	"github.com/smira/flag"
)
const (
	Yes = "yes"
	No  = "no"
)
func ListPackagesRefList(reflist *deb.PackageRefList) (err error) {
	fmt.Printf("Packages:\n")
	if reflist == nil {
		return
	}
	list, err := deb.NewPackageListFromRefList(reflist, context.CollectionFactory().PackageCollection(), context.Progress())
	if err != nil {
		return fmt.Errorf("unable to load packages: %s", err)
	}
	return PrintPackageList(list, "", "  ")
}
func PrintPackageList(result *deb.PackageList, format, prefix string) error {
	result.PrepareIndex()
	if format == "" {
		return result.ForEachIndexed(func(p *deb.Package) error {
			context.Progress().Printf(prefix+"%s\n", p)
			return nil
		})
	}
	formatTemplate, err := template.New("format").Parse(format)
	if err != nil {
		return fmt.Errorf("error parsing -format template: %s", err)
	}
	return result.ForEachIndexed(func(p *deb.Package) error {
		b := &bytes.Buffer{}
		err = formatTemplate.Execute(b, p.ExtendedStanza())
		if err != nil {
			return fmt.Errorf("error applying template: %s", err)
		}
		context.Progress().Printf(prefix+"%s\n", b.String())
		return nil
	})
}
func LookupOption(defaultValue bool, flags *flag.FlagSet, name string) (result bool) {
	result = defaultValue
	if flags.IsSet(name) {
		result = flags.Lookup(name).Value.Get().(bool)
	}
	return
}