From 6a70d9968c3dfd904e678814f55a9da2206d4af0 Mon Sep 17 00:00:00 2001
From: Thomas Waldmann <tw@waldmann-edv.de>
Date: Sun, 5 Jun 2016 01:22:43 +0200
Subject: [PATCH] make borg check work for empty repo

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

diff --git a/borg/archive.py b/borg/archive.py
index b10bac07a..e21c1aab5 100644
--- a/borg/archive.py
+++ b/borg/archive.py
@@ -695,7 +695,12 @@ class ArchiveChecker:
                 self.chunks[id_] = (0, 0, 0)
 
     def identify_key(self, repository):
-        cdata = repository.get(next(self.chunks.iteritems())[0])
+        try:
+            some_chunkid, _ = next(self.chunks.iteritems())
+        except StopIteration:
+            # repo is completely empty, no chunks
+            return None
+        cdata = repository.get(some_chunkid)
         return key_factory(repository, cdata)
 
     def rebuild_manifest(self):