fix(alias): stabilize list root result (#1401)

Author: KirCute

drivers/alias/driver.go

@@ -23,6 +23,7 @@ import (
 type Alias struct {
 	model.Storage
 	Addition
+	rootOrder   []string
 	pathMap     map[string][]string
 	autoFlatten bool
 	oneKey      string
@@ -40,13 +41,18 @@ func (d *Alias) Init(ctx context.Context) error {
 	if d.Paths == "" {
 		return errors.New("paths is required")
 	}
+	paths := strings.Split(d.Paths, "\n")
+	d.rootOrder = make([]string, 0, len(paths))
 	d.pathMap = make(map[string][]string)
-	for _, path := range strings.Split(d.Paths, "\n") {
+	for _, path := range paths {
 		path = strings.TrimSpace(path)
 		if path == "" {
 			continue
 		}
 		k, v := getPair(path)
+		if _, ok := d.pathMap[k]; !ok {
+			d.rootOrder = append(d.rootOrder, k)
+		}
 		d.pathMap[k] = append(d.pathMap[k], v)
 	}
 	if len(d.pathMap) == 1 {
@@ -62,6 +68,7 @@ func (d *Alias) Init(ctx context.Context) error {
 }
 
 func (d *Alias) Drop(ctx context.Context) error {
+	d.rootOrder = nil
 	d.pathMap = nil
 	return nil
 }

drivers/alias/util.go

@@ -19,14 +19,15 @@ import (
 func (d *Alias) listRoot(ctx context.Context, withDetails bool) []model.Obj {
 	var objs []model.Obj
 	var wg sync.WaitGroup
-	for k, v := range d.pathMap {
+	for _, k := range d.rootOrder {
 		obj := model.Object{
 			Name:     k,
 			IsFolder: true,
 			Modified: d.Modified,
 		}
 		idx := len(objs)
 		objs = append(objs, &obj)
+		v := d.pathMap[k]
 		if !withDetails || len(v) != 1 {
 			continue
 		}