feature (plg_backend_local): better error handling

server/common/files_linux.go

@@ -1,6 +1,8 @@
 package common
 
 import (
+	"errors"
+	"io/fs"
 	"os"
 	"syscall"
 )
@@ -10,5 +12,9 @@ func SafeOsOpenFile(path string, flag int, perm os.FileMode) (*os.File, error) {
 		Log.Debug("common::files safeOsOpenFile err[%s] path[%s]", err.Error(), path)
 		return nil, ErrFilesystemError
 	}
-	return os.OpenFile(path, flag|syscall.O_NOFOLLOW, perm)
+	f, err := os.OpenFile(path, flag|syscall.O_NOFOLLOW, perm)
+	if err != nil && errors.Is(err, fs.ErrNotExist) {
+		return nil, ErrNotFound
+	}
+	return f, err
 }