fs: refactor fs.ConfigMap to take a prefix and Options rather than an fs.RegInfo

This is in preparation for generalising the backend config system

cmd/serve/docker/options.go

@@ -88,7 +88,7 @@ func (vol *Volume) applyOptions(volOpt VolOpts) error {
 		fsType = "local"
 		if fsName != "" {
 			var ok bool
-			fsType, ok = fs.ConfigMap(nil, fsName, nil).Get("type")
+			fsType, ok = fs.ConfigMap("", nil, fsName, nil).Get("type")
 			if !ok {
 				return fs.ErrorNotFoundInConfigFile
 			}

fs/config/authorize.go

@@ -60,7 +60,7 @@ func Authorize(ctx context.Context, args []string, noAutoBrowser bool, templateF
 	// Name used for temporary remote
 	name := "**temp-fs**"
 
-	m := fs.ConfigMap(ri, name, inM)
+	m := fs.ConfigMap(ri.Prefix, ri.Options, name, inM)
 	outM := configmap.Simple{}
 	m.ClearSetters()
 	m.AddSetter(outM)

fs/config/config.go

@@ -470,7 +470,7 @@ func updateRemote(ctx context.Context, name string, keyValues rc.Params, opt Upd
 	}
 
 	choices := configmap.Simple{}
-	m := fs.ConfigMap(ri, name, nil)
+	m := fs.ConfigMap(ri.Prefix, ri.Options, name, nil)
 
 	// Set the config
 	for k, v := range keyValues {

fs/config/ui.go

@@ -454,7 +454,7 @@ func PostConfig(ctx context.Context, name string, m configmap.Mapper, ri *fs.Reg
 func RemoteConfig(ctx context.Context, name string) error {
 	fmt.Printf("Remote config\n")
 	ri := mustFindByName(name)
-	m := fs.ConfigMap(ri, name, nil)
+	m := fs.ConfigMap(ri.Prefix, ri.Options, name, nil)
 	if ri.Config == nil {
 		return nil
 	}

fs/configmap.go

@@ -23,25 +23,26 @@ func (configName configEnvVars) Get(key string) (value string, ok bool) {
 
 // A configmap.Getter to read from the environment RCLONE_option_name
 type optionEnvVars struct {
-	fsInfo *RegInfo
+	prefix  string
+	options Options
 }
 
 // Get a config item from the option environment variables if possible
 func (oev optionEnvVars) Get(key string) (value string, ok bool) {
-	opt := oev.fsInfo.Options.Get(key)
+	opt := oev.options.Get(key)
 	if opt == nil {
 		return "", false
 	}
-	envKey := OptionToEnv(oev.fsInfo.Prefix + "-" + key)
+	envKey := OptionToEnv(oev.prefix + "-" + key)
 	value, ok = os.LookupEnv(envKey)
 	if ok {
-		Debugf(nil, "Setting %s_%s=%q from environment variable %s", oev.fsInfo.Prefix, key, value, envKey)
+		Debugf(nil, "Setting %s_%s=%q from environment variable %s", oev.prefix, key, value, envKey)
 	} else if opt.NoPrefix {
 		// For options with NoPrefix set, check without prefix too
 		envKey := OptionToEnv(key)
 		value, ok = os.LookupEnv(envKey)
 		if ok {
-			Debugf(nil, "Setting %s=%q for %s from environment variable %s", key, value, oev.fsInfo.Prefix, envKey)
+			Debugf(nil, "Setting %s=%q for %s from environment variable %s", key, value, oev.prefix, envKey)
 		}
 	}
 	return value, ok
@@ -50,14 +51,14 @@ func (oev optionEnvVars) Get(key string) (value string, ok bool) {
 // A configmap.Getter to read either the default value or the set
 // value from the RegInfo.Options
 type regInfoValues struct {
-	fsInfo     *RegInfo
+	options    Options
 	useDefault bool
 }
 
 // override the values in configMap with the either the flag values or
 // the default values
 func (r *regInfoValues) Get(key string) (value string, ok bool) {
-	opt := r.fsInfo.Options.Get(key)
+	opt := r.options.Get(key)
 	if opt != nil && (r.useDefault || opt.Value != nil) {
 		return opt.String(), true
 	}
@@ -89,13 +90,15 @@ func (section getConfigFile) Get(key string) (value string, ok bool) {
 	return value, ok
 }
 
-// ConfigMap creates a configmap.Map from the *RegInfo and the
+// ConfigMap creates a configmap.Map from the Options, prefix and the
 // configName passed in. If connectionStringConfig has any entries (it may be nil),
 // then it will be added to the lookup with the highest priority.
 //
-// If fsInfo is nil then the returned configmap.Map should only be
+// If options is nil then the returned configmap.Map should only be
 // used for reading non backend specific parameters, such as "type".
-func ConfigMap(fsInfo *RegInfo, configName string, connectionStringConfig configmap.Simple) (config *configmap.Map) {
+//
+// This can be used for global settings if prefix is "" and configName is ""
+func ConfigMap(prefix string, options Options, configName string, connectionStringConfig configmap.Simple) (config *configmap.Map) {
 	// Create the config
 	config = configmap.New()
 
@@ -107,24 +110,26 @@ func ConfigMap(fsInfo *RegInfo, configName string, connectionStringConfig config
 	}
 
 	// flag values
-	if fsInfo != nil {
-		config.AddGetter(&regInfoValues{fsInfo, false}, configmap.PriorityNormal)
+	if options != nil {
+		config.AddGetter(&regInfoValues{options, false}, configmap.PriorityNormal)
 	}
 
 	// remote specific environment vars
 	config.AddGetter(configEnvVars(configName), configmap.PriorityNormal)
 
 	// backend specific environment vars
-	if fsInfo != nil {
-		config.AddGetter(optionEnvVars{fsInfo: fsInfo}, configmap.PriorityNormal)
+	if options != nil && prefix != "" {
+		config.AddGetter(optionEnvVars{prefix: prefix, options: options}, configmap.PriorityNormal)
 	}
 
 	// config file
-	config.AddGetter(getConfigFile(configName), configmap.PriorityConfig)
+	if configName != "" {
+		config.AddGetter(getConfigFile(configName), configmap.PriorityConfig)
+	}
 
 	// default values
-	if fsInfo != nil {
-		config.AddGetter(&regInfoValues{fsInfo, true}, configmap.PriorityDefault)
+	if options != nil {
+		config.AddGetter(&regInfoValues{options, true}, configmap.PriorityDefault)
 	}
 
 	// Set Config

fs/fs_test.go

@@ -314,12 +314,6 @@ func TestOptionGetters(t *testing.T) {
 		}
 	}()
 
-	fsInfo := &RegInfo{
-		Name:    "local",
-		Prefix:  "local",
-		Options: testOptions,
-	}
-
 	oldConfigFileGet := ConfigFileGet
 	ConfigFileGet = func(section, key string) (string, bool) {
 		if section == "sausage" && key == "key1" {
@@ -337,16 +331,16 @@ func TestOptionGetters(t *testing.T) {
 	configEnvVarsGetter := configEnvVars("local")
 
 	// A configmap.Getter to read from the environment RCLONE_option_name
-	optionEnvVarsGetter := optionEnvVars{fsInfo}
+	optionEnvVarsGetter := optionEnvVars{"local", testOptions}
 
 	// A configmap.Getter to read either the default value or the set
 	// value from the RegInfo.Options
 	regInfoValuesGetterFalse := &regInfoValues{
-		fsInfo:     fsInfo,
+		options:    testOptions,
 		useDefault: false,
 	}
 	regInfoValuesGetterTrue := &regInfoValues{
-		fsInfo:     fsInfo,
+		options:    testOptions,
 		useDefault: true,
 	}
 

fs/newfs.go

@@ -83,7 +83,7 @@ func ConfigFs(path string) (fsInfo *RegInfo, configName, fsPath string, config *
 	if err != nil {
 		return
 	}
-	config = ConfigMap(fsInfo, configName, connectionStringConfig)
+	config = ConfigMap(fsInfo.Prefix, fsInfo.Options, configName, connectionStringConfig)
 	return
 }
 
@@ -101,7 +101,7 @@ func ParseRemote(path string) (fsInfo *RegInfo, configName, fsPath string, conne
 		if strings.HasPrefix(configName, ":") {
 			fsName = configName[1:]
 		} else {
-			m := ConfigMap(nil, configName, parsed.Config)
+			m := ConfigMap("", nil, configName, parsed.Config)
 			fsName, ok = m.Get("type")
 			if !ok {
 				return nil, "", "", nil, ErrorNotFoundInConfigFile