moby: Add verbose and quiet flags to moby commandline

These set the log level to Debug and Error. The default
log level is set to Info.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>

src/cmd/moby/main.go

@@ -4,18 +4,25 @@ import (
 	"flag"
 	"fmt"
 	"os"
+
+	log "github.com/Sirupsen/logrus"
 )
 
 func main() {
 	flag.Usage = func() {
-		fmt.Printf("USAGE: %s COMMAND\n\n", os.Args[0])
+		fmt.Printf("USAGE: %s [options] COMMAND\n\n", os.Args[0])
 		fmt.Printf("Commands:\n")
 		fmt.Printf("  build       Build a Moby image from a YAML file\n")
 		fmt.Printf("  run         Run a Moby image on a local hypervisor\n")
 		fmt.Printf("  help        Print this message\n")
 		fmt.Printf("\n")
 		fmt.Printf("Run '%s COMMAND --help' for more information on the command\n", os.Args[0])
+		fmt.Printf("\n")
+		fmt.Printf("Options:\n")
+		flag.PrintDefaults()
 	}
+	flagQuiet := flag.Bool("q", false, "Quiet execution")
+	flagVerbose := flag.Bool("v", false, "Verbose execution")
 
 	buildCmd := flag.NewFlagSet("build", flag.ExitOnError)
 	buildCmd.Usage = func() {
@@ -44,23 +51,39 @@ func main() {
 	runDiskSz := runCmd.Int("disk-size", 0, "Size of Disk in MB")
 	runDisk := runCmd.String("disk", "", "Path to disk image to used")
 
-	if len(os.Args) < 2 {
+	// Set up logging
+	log.SetFormatter(&log.TextFormatter{})
+	log.SetLevel(log.InfoLevel)
+	flag.Parse()
+	if *flagQuiet && *flagVerbose {
+		fmt.Printf("Can't set quiet and verbose flag at the same time\n")
+		os.Exit(1)
+	}
+	if *flagQuiet {
+		log.SetLevel(log.ErrorLevel)
+	}
+	if *flagVerbose {
+		log.SetLevel(log.DebugLevel)
+	}
+
+	args := flag.Args()
+	if len(args) < 1 {
 		fmt.Printf("Please specify a command.\n\n")
 		flag.Usage()
 		os.Exit(1)
 	}
 
-	switch os.Args[1] {
+	switch args[0] {
 	case "build":
-		buildCmd.Parse(os.Args[2:])
+		buildCmd.Parse(args[1:])
 		build(*buildName, *buildPull, buildCmd.Args())
 	case "run":
-		runCmd.Parse(os.Args[2:])
+		runCmd.Parse(args[1:])
 		run(*runCPUs, *runMem, *runDiskSz, *runDisk, runCmd.Args())
 	case "help":
 		flag.Usage()
 	default:
-		fmt.Printf("%q is not valid command.\n\n", os.Args[1])
+		fmt.Printf("%q is not valid command.\n\n", args[0])
 		flag.Usage()
 		os.Exit(1)
 	}