set filer2.ErrNotFound for not found entry

weed/filer2/abstract_sql/abstract_sql_store.go

@@ -64,7 +64,7 @@ func (store *AbstractSqlStore) FindEntry(fullpath filer2.FullPath) (*filer2.Entr
 	row := store.DB.QueryRow(store.SqlFind, hashToLong(dir), name, dir)
 	var data []byte
 	if err := row.Scan(&data); err != nil {
-		return nil, fmt.Errorf("read entry %s: %v", fullpath, err)
+		return nil, filer2.ErrNotFound
 	}
 
 	entry := &filer2.Entry{

weed/filer2/cassandra/cassandra_store.go

@@ -68,7 +68,7 @@ func (store *CassandraStore) FindEntry(fullpath filer2.FullPath) (entry *filer2.
 		"SELECT meta FROM filemeta WHERE directory=? AND name=?",
 		dir, name).Consistency(gocql.One).Scan(&data); err != nil {
 		if err != gocql.ErrNotFound {
-			return nil, fmt.Errorf("read entry %s: %v", fullpath, err)
+			return nil, filer2.ErrNotFound
 		}
 	}
 

weed/filer2/filerstore.go

@@ -11,6 +11,7 @@ type FilerStore interface {
 	Initialize(configuration Configuration) error
 	InsertEntry(*Entry) error
 	UpdateEntry(*Entry) (err error)
+	// err == filer2.ErrNotFound if not found
 	FindEntry(FullPath) (entry *Entry, err error)
 	DeleteEntry(FullPath) (err error)
 	ListDirectoryEntries(dirPath FullPath, startFileName string, includeStartFile bool, limit int) ([]*Entry, error)

weed/filer2/memdb/memdb_store.go

@@ -49,7 +49,7 @@ func (store *MemDbStore) UpdateEntry(entry *filer2.Entry) (err error) {
 func (store *MemDbStore) FindEntry(fullpath filer2.FullPath) (entry *filer2.Entry, err error) {
 	item := store.tree.Get(entryItem{&filer2.Entry{FullPath: fullpath}})
 	if item == nil {
-		return nil, nil
+		return nil, filer2.ErrNotFound
 	}
 	entry = item.(entryItem).Entry
 	return entry, nil