FIX backup binary and save with .distupg_save suffix

pleskdistup/actions/distupgrade.py

@@ -176,47 +176,47 @@ def name(self):
         return self._name.format(self=self)
 
     def _apply_replace_on_file(self, fpath: str, ptrn: re.Pattern, to_regexp: str) -> None:
-        old_lines = []
+        changed = False
         new_lines = []
         with open(fpath) as f:
             for line in f:
-                old_lines.append(line)
                 new_lines.append(ptrn.sub(to_regexp, line))
-        if not [idx for idx, (e1, e2) in enumerate(zip(old_lines, new_lines)) if e1 != e2]:
+                if new_lines[-1] != line:
+                    changed = True
+        if not changed:
             return
-        with open(fpath + self.backup_suffix, 'w') as f:
-            f.truncate(0)
-            f.writelines(old_lines)
+        with open(fpath + self.backup_suffix, 'wb') as b:
+            with open(fpath, 'rb') as f:
+                b.write(f.read())
         with open(fpath, 'w') as f:
-            f.truncate(0)
             f.writelines(new_lines)
 
     def _revert_file(self, fpath: str):
         backup_path = fpath + self.backup_suffix
         if not os.path.exists(backup_path):
             return
-        with open(backup_path) as b:
-            with open(fpath, 'w') as f:
-                f.truncate(0)
-                f.writelines(b.readlines())
+        with open(backup_path, 'rb') as b:
+            with open(fpath, 'wb') as f:
+                f.write(b.read())
         os.remove(backup_path)
 
-    def _rm_backups(self):
+    def _mv_backups(self, new_suffix: str):
         backup_path = self.sources_list_path + self.backup_suffix
         if os.file.exists(backup_path):
             try:
-                os.remove(backup_path)
+                os.rename(backup_path, self.sources_list_path + new_suffix)
             except Exception as ex:
-                log.info(f"Skip failed remove backup ({backup_path}): {ex}")
+                log.info(f"Skip failed move backup ({backup_path}): {ex}")
         for root, _, filenames in os.walk(self.sources_list_d_path):
             for f in filenames:
                 if not f.endswith(self.backup_suffix):
                     continue
                 backup_path = os.path.join(root, f)
                 try:
-                    os.remove(backup_path)
+                    os.rename(backup_path,
+                              backup_path[0:-len(self.backup_suffix)] + new_suffix)
                 except Exception as ex:
-                    log.info(f"Skip failed remove backup ({backup_path}): {ex}")
+                    log.info(f"Skip failed move backup ({backup_path}): {ex}")
 
     def _change_by_regexp(self, from_regexp: str, to_regexp: str) -> None:
         p = re.compile(from_regexp)
@@ -240,7 +240,7 @@ def _prepare_action(self) -> action.ActionResult:
         return action.ActionResult()
 
     def _post_action(self) -> action.ActionResult:
-        self._rm_backups()
+        self._mv_backups(".distupg_save")
         return action.ActionResult()
 
     def _revert_action(self) -> action.ActionResult: