auth proxy: convert options to new style

cmd/serve/proxy/proxy.go

@@ -106,14 +106,23 @@ backend that rclone supports.
 
 `, "|", "`")
 
+// OptionsInfo descripts the Options in use
+var OptionsInfo = fs.Options{{
+	Name:    "auth_proxy",
+	Default: "",
+	Help:    "A program to use to create the backend from the auth",
+}}
+
 // Options is options for creating the proxy
 type Options struct {
-	AuthProxy string
+	AuthProxy string `config:"auth_proxy"`
 }
 
-// DefaultOpt is the default values uses for Opt
-var DefaultOpt = Options{
-	AuthProxy: "",
+// Opt is the default options
+var Opt Options
+
+func init() {
+	fs.RegisterGlobalOptions(fs.OptionsInfo{Name: "proxy", Opt: &Opt, Options: OptionsInfo})
 }
 
 // Proxy represents a proxy to turn auth requests into a VFS

cmd/serve/proxy/proxy_test.go

@@ -20,7 +20,7 @@ import (
 )
 
 func TestRun(t *testing.T) {
-	opt := DefaultOpt
+	opt := Opt
 	cmd := "go run proxy_code.go"
 	opt.AuthProxy = cmd
 	p := New(context.Background(), &opt, &vfscommon.Opt)

cmd/serve/proxy/proxyflags/proxyflags.go

@@ -7,12 +7,7 @@ import (
 	"github.com/spf13/pflag"
 )
 
-// Options set by command line flags
-var (
-	Opt = proxy.DefaultOpt
-)
-
 // AddFlags adds the non filing system specific flags to the command
 func AddFlags(flagSet *pflag.FlagSet) {
-	flags.StringVarP(flagSet, &Opt.AuthProxy, "auth-proxy", "", Opt.AuthProxy, "A program to use to create the backend from the auth", "")
+	flags.AddFlagsFromOptions(flagSet, "", proxy.OptionsInfo)
 }