From fdcd082dfad0fd979ce46331cc98113a1683f3b4 Mon Sep 17 00:00:00 2001
From: John Christopher Anderson <jchris@apache.org>
Date: Thu, 1 Jul 2010 21:37:49 +0000
Subject: prevent zero byte files, closes COUCHDB-647

git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@959791 13f79535-47bb-0310-9956-ffa450edef68
---
 src/couchdb/couch_db_updater.erl | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/couchdb/couch_db_updater.erl b/src/couchdb/couch_db_updater.erl
index e4eb72cc..5042e3cb 100644
--- a/src/couchdb/couch_db_updater.erl
+++ b/src/couchdb/couch_db_updater.erl
@@ -30,7 +30,16 @@ init({MainPid, DbName, Filepath, Fd, Options}) ->
         couch_file:delete(Filepath ++ ".compact");
     false ->
         ok = couch_file:upgrade_old_header(Fd, <<$g, $m, $k, 0>>), % 09 UPGRADE CODE
-        {ok, Header} = couch_file:read_header(Fd)
+        case couch_file:read_header(Fd) of
+        {ok, Header} ->
+            ok;
+        no_valid_header ->
+            % create a new header and writes it to the file
+            Header =  #db_header{},
+            ok = couch_file:write_header(Fd, Header),
+            % delete any old compaction files that might be hanging around
+            file:delete(Filepath ++ ".compact")
+        end
     end,
 
     Db = init_db(DbName, Filepath, Fd, Header),
-- 
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