From 080bece2586d348b9791892cd6e5670a7afdb1a9 Mon Sep 17 00:00:00 2001
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Date: Fri, 12 Oct 2012 09:41:52 +0200
Subject: [PATCH] Assure that host entries in known_hosts files do not
 duplicate endlessly if keys from known_hosts are loaded via HostKeys.load()
 more than once (e.g. for refreshing the list of known hosts during runtime).

---
 paramiko/hostkeys.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/paramiko/hostkeys.py b/paramiko/hostkeys.py
index da5b66c..27b9fef 100644
--- a/paramiko/hostkeys.py
+++ b/paramiko/hostkeys.py
@@ -168,7 +168,12 @@ class HostKeys (UserDict.DictMixin):
                 continue
             e = HostKeyEntry.from_line(line)
             if e is not None:
-                self._entries.append(e)
+                _hostnames = e.hostnames
+                for h in _hostnames:
+                    if self.check(h, e.key):
+                        e.hostnames.remove(h)
+                if len(e.hostnames):
+                    self._entries.append(e)
         f.close()
 
     def save(self, filename):