github.com/slava-ustovytski/docker@v1.8.2-rc1/docker/docker.go (about)

     1  package main
     2  
     3  import (
     4  	"fmt"
     5  	"os"
     6  	"sort"
     7  
     8  	"github.com/Sirupsen/logrus"
     9  	"github.com/docker/docker/api/client"
    10  	"github.com/docker/docker/autogen/dockerversion"
    11  	"github.com/docker/docker/cli"
    12  	flag "github.com/docker/docker/pkg/mflag"
    13  	"github.com/docker/docker/pkg/reexec"
    14  	"github.com/docker/docker/pkg/term"
    15  	"github.com/docker/docker/utils"
    16  )
    17  
    18  func main() {
    19  	if reexec.Init() {
    20  		return
    21  	}
    22  
    23  	// Set terminal emulation based on platform as required.
    24  	stdin, stdout, stderr := term.StdStreams()
    25  
    26  	logrus.SetOutput(stderr)
    27  
    28  	flag.Merge(flag.CommandLine, clientFlags.FlagSet, commonFlags.FlagSet)
    29  
    30  	flag.Usage = func() {
    31  		fmt.Fprint(os.Stdout, "Usage: docker [OPTIONS] COMMAND [arg...]\n"+daemonUsage+"       docker [ --help | -v | --version ]\n\n")
    32  		fmt.Fprint(os.Stdout, "A self-sufficient runtime for containers.\n\nOptions:\n")
    33  
    34  		flag.CommandLine.SetOutput(os.Stdout)
    35  		flag.PrintDefaults()
    36  
    37  		help := "\nCommands:\n"
    38  
    39  		// TODO(tiborvass): no need to sort if we ensure dockerCommands is sorted
    40  		sort.Sort(byName(dockerCommands))
    41  
    42  		for _, cmd := range dockerCommands {
    43  			help += fmt.Sprintf("    %-10.10s%s\n", cmd.name, cmd.description)
    44  		}
    45  
    46  		help += "\nRun 'docker COMMAND --help' for more information on a command."
    47  		fmt.Fprintf(os.Stdout, "%s\n", help)
    48  	}
    49  
    50  	flag.Parse()
    51  
    52  	if *flVersion {
    53  		showVersion()
    54  		return
    55  	}
    56  
    57  	clientCli := client.NewDockerCli(stdin, stdout, stderr, clientFlags)
    58  	// TODO: remove once `-d` is retired
    59  	handleGlobalDaemonFlag()
    60  
    61  	if *flHelp {
    62  		// if global flag --help is present, regardless of what other options and commands there are,
    63  		// just print the usage.
    64  		flag.Usage()
    65  		return
    66  	}
    67  
    68  	c := cli.New(clientCli, daemonCli)
    69  	if err := c.Run(flag.Args()...); err != nil {
    70  		if sterr, ok := err.(cli.StatusError); ok {
    71  			if sterr.Status != "" {
    72  				fmt.Fprintln(os.Stderr, sterr.Status)
    73  				os.Exit(1)
    74  			}
    75  			os.Exit(sterr.StatusCode)
    76  		}
    77  		fmt.Fprintln(os.Stderr, err)
    78  		os.Exit(1)
    79  	}
    80  }
    81  
    82  func showVersion() {
    83  	if utils.ExperimentalBuild() {
    84  		fmt.Printf("Docker version %s, build %s, experimental\n", dockerversion.VERSION, dockerversion.GITCOMMIT)
    85  	} else {
    86  		fmt.Printf("Docker version %s, build %s\n", dockerversion.VERSION, dockerversion.GITCOMMIT)
    87  	}
    88  }