Add workaround for (bogus) reverse address lookups

src/mio/filecache.py

@@ -76,9 +76,25 @@ class Unalias:
                 byaddr.add(sa[0])
                 pass
             self.by_name[host] = set()
-            for name,_,_ in map(socket.gethostbyaddr, byaddr):
+            for addr in byaddr:
+                # Temporary fix for totally broken design
+                # we should not rely on reverse lookups since that
+                # mostly fails for local addresses, we should implemennt
+                # handling of mirrorlists/metalinks
+                try:
+                    name,_,_ = socket.gethostbyaddr(addr)
                     self.by_name[host].add(str(name))
                     pass
+                except:
+                    pass
+                pass
+            pass
+        if not self.by_name[host]:
+            # Temporary fix for totally broken design
+            # we should not rely on reverse lookups since that
+            # mostly fails for local addresses, we should implemennt
+            # handling of mirrorlists/metalinks
+            self.by_name[host].add(host)
             pass
         return sorted(self.by_name[host])