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moby--moby/api/client/help.go

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package client
import (
"fmt"
"os"
flag "github.com/docker/docker/pkg/mflag"
)
// CmdHelp displays information on a Docker command.
//
// If more than one command is specified, information is only shown for the first command.
//
// Usage: docker help COMMAND or docker COMMAND --help
func (cli *DockerCli) CmdHelp(args ...string) error {
if len(args) > 1 {
method, exists := cli.getMethod(args[:2]...)
if exists {
method("--help")
return nil
}
}
if len(args) > 0 {
method, exists := cli.getMethod(args[0])
if !exists {
fmt.Fprintf(cli.err, "docker: '%s' is not a docker command. See 'docker --help'.\n", args[0])
os.Exit(1)
} else {
method("--help")
return nil
}
}
flag.Usage()
return nil
}