linuxkit: Order push/run backends and cases alphabetically

This makes it easier to identify where a new backend should be added.
It's also simpler to match help text and case statements.

Signed-off-by: Dave Tucker <dt@docker.com>

src/cmd/linuxkit/push.go

@@ -11,13 +11,13 @@ import (
 func pushUsage() {
 	invoked := filepath.Base(os.Args[0])
 	fmt.Printf("USAGE: %s push [backend] [options] [prefix]\n\n", invoked)
-
 	fmt.Printf("'backend' specifies the push backend.\n")
 	fmt.Printf("Supported backends are\n")
+	// Please keep these in alphabetical order
+	fmt.Printf("  aws\n")
+	fmt.Printf("  azure\n")
 	fmt.Printf("  gcp\n")
 	fmt.Printf("  vcenter\n")
-	fmt.Printf("  azure\n")
-	fmt.Printf("  aws\n")
 	fmt.Printf("\n")
 	fmt.Printf("'options' are the backend specific options.\n")
 	fmt.Printf("See '%s push [backend] --help' for details.\n\n", invoked)
@@ -31,17 +31,18 @@ func push(args []string) {
 	}
 
 	switch args[0] {
+	// Please keep cases in alphabetical order
+	case "aws":
+		pushAWS(args[1:])
+	case "azure":
+		pushAzure(args[1:])
+	case "gcp":
+		pushGcp(args[1:])
 	case "help", "-h", "-help", "--help":
 		pushUsage()
 		os.Exit(0)
-	case "gcp":
-		pushGcp(args[1:])
 	case "vcenter":
 		pushVCenter(args[1:])
-	case "azure":
-		pushAzure(args[1:])
-	case "aws":
-		pushAWS(args[1:])
 	default:
 		log.Errorf("No 'push' backend specified.")
 	}

src/cmd/linuxkit/run.go

@@ -16,14 +16,15 @@ func runUsage() {
 	fmt.Printf("'backend' specifies the run backend.\n")
 	fmt.Printf("If not specified the platform specific default will be used\n")
 	fmt.Printf("Supported backends are (default platform in brackets):\n")
+	// Please keep these in alphabetical order
 	fmt.Printf("  aws\n")
 	fmt.Printf("  azure\n")
 	fmt.Printf("  gcp\n")
 	fmt.Printf("  hyperkit [macOS]\n")
+	fmt.Printf("  packet\n")
 	fmt.Printf("  qemu [linux]\n")
 	fmt.Printf("  vcenter\n")
 	fmt.Printf("  vmware\n")
-	fmt.Printf("  packet\n")
 	fmt.Printf("\n")
 	fmt.Printf("'options' are the backend specific options.\n")
 	fmt.Printf("See '%s run [backend] --help' for details.\n\n", invoked)
@@ -38,23 +39,24 @@ func run(args []string) {
 	}
 
 	switch args[0] {
+	// Please keep cases in alphabetical order
+	case "aws":
+		runAWS(args[1:])
+	case "azure":
+		runAzure(args[1:])
+	case "gcp":
+		runGcp(args[1:])
 	case "help", "-h", "-help", "--help":
 		runUsage()
 		os.Exit(0)
-	case "aws":
-		runAWS(args[1:])
 	case "hyperkit":
 		runHyperKit(args[1:])
-	case "azure":
-		runAzure(args[1:])
-	case "vmware":
-		runVMware(args[1:])
-	case "gcp":
-		runGcp(args[1:])
-	case "qemu":
-		runQemu(args[1:])
 	case "packet":
 		runPacket(args[1:])
+	case "qemu":
+		runQemu(args[1:])
+	case "vmware":
+		runVMware(args[1:])
 	case "vcenter":
 		runVcenter(args[1:])
 	default: