From 189d6eea2697e6496d8594e0a86217587f687967 Mon Sep 17 00:00:00 2001
From: Blake Griffith <blake.a.griffith@gmail.com>
Date: Tue, 29 Dec 2015 08:19:47 -0600
Subject: [PATCH] Add check that symlinks exist.

---
 letsencrypt/storage.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/letsencrypt/storage.py b/letsencrypt/storage.py
index 08b48ff5e..9b2b1705a 100644
--- a/letsencrypt/storage.py
+++ b/letsencrypt/storage.py
@@ -128,6 +128,15 @@ class RenewableCert(object):  # pylint: disable=too-many-instance-attributes
         self.fullchain = self.configuration["fullchain"]
 
         self._fix_symlinks()
+        self._check_symlinks()
+
+    def _check_symlinks(self):
+        def check(link):
+            return os.path.exists(os.path.realpath(link))
+        for kind in ALL_FOUR:
+            if not check(getattr(self, kind)):
+                raise errors.CertStorageError(
+                        "link: {0} does not exist".format(getattr(self, kind)))
 
     def _consistent(self):
         """Are the files associated with this lineage self-consistent?