Prepare link collection

lib/obs_revision.py

@@ -61,24 +61,30 @@ class OBSRevision:
     def __repr__(self):
         return f"[{self.__str__()}]"
 
-    def check_link(self):
-        """Add 'linkrev' attribute into the revision. Returns False if the link is invalid"""
+    def read_link(self):
         try:
-            root = self.obs._xml(
+            return self.obs._xml(
                 f"source/{self.project}/{self.package}/_link", rev=self.srcmd5
             )
         except HTTPError as e:
             if e.code == 404:
                 logging.debug("No _link for the revision")
-                return True
+                return None
             raise e
+
+    def check_link(self):
+        """Add 'linkrev' attribute into the revision. Returns False if the link is invalid"""
+        try:
+            root = self.read_link()
+            if root is None:
+                return True
+            target_project = root.get("project")
         except ET.ParseError:
             logging.error(
                 f"_link can't be parsed [{self.project}/{self.package} rev={self.srcmd5}]"
             )
             return False
 
-        target_project = root.get("project")
         rev = self.history.find_last_rev_after_time(target_project, self.time)
         if rev:
             logging.debug(f"Linkrev found: {rev}")