Tweaks to rclone authorize

* Document the headless / remote setup procedure
  * Move Config constants into fs
  * Parse arguments in main for Authorize

fs/config.go

@@ -26,6 +26,18 @@ import (
 
 const (
 	configFileName = ".rclone.conf"
+
+	// ConfigToken is the key used to store the token under
+	ConfigToken = "token"
+
+	// ConfigClientID is the config key used to store the client id
+	ConfigClientID = "client_id"
+
+	// ConfigClientSecret is the config key used to store the client secret
+	ConfigClientSecret = "client_secret"
+
+	// ConfigAutomatic indicates that we want non-interactive configuration
+	ConfigAutomatic = "config_automatic"
 )
 
 // SizeSuffix is parsed by flag with k/M/G suffixes
@@ -533,21 +545,13 @@ func EditConfig() {
 	}
 }
 
-// Duplicated from oauthutil to avoid circular reference.
-const (
-	// ConfigClientID is the config key used to store the client id
-	ConfigClientID = "client_id"
-
-	// ConfigClientSecret is the config key used to store the client secret
-	ConfigClientSecret = "client_secret"
-
-	// ConfigAutomatic indicates that we want non-interactive configuration
-	ConfigAutomatic = "config_automatic"
-)
-
 // Authorize is for remote authorization of headless machines.
-func Authorize() {
-	args := pflag.Args()[1:]
+//
+// It expects 1 or 3 arguments
+//
+//   rclone authorize "fs name"
+//   rclone authorize "fs name" "client id" "client secret"
+func Authorize(args []string) {
 	switch len(args) {
 	case 1, 3:
 	default:
@@ -560,7 +564,7 @@ func Authorize() {
 	}
 
 	if fs.Config == nil {
-		log.Fatalf("No configuration on fs %v", newType)
+		log.Fatalf("Can't authorize fs %q", newType)
 	}
 	// Name used for temporary fs
 	name := "**temp-fs**"