Fix CHEF-1851: in features tests, on creating right couch db

chef_integration right after deleting, we sometimes get a 412
due to a Couch bug. Retry up to 10 times as this issue goes
away (same fix as for couchdb_replicate work)

1 files changed, 34 insertions, 1 deletions

diff --git a/features/support/env.rb b/features/support/env.rb
index 5cb8958498..652169a2b6 100644
--- a/features/support/env.rb
+++ b/features/support/env.rb
@@ -80,7 +80,40 @@ end
 def create_databases
   Chef::Log.info("Creating bootstrap databases")
   cdb = Chef::CouchDB.new(Chef::Config[:couchdb_url], "chef_integration")
-  cdb.create_db
+
+  # Sometimes Couch returns a '412 Precondition Failed' when creating a database,
+  # via a PUT to its URL, as the DELETE from the previous step in delete_databases
+  # has not yet finished. This condition disappears if you try again. So here we 
+  # try up to 10 times if PreconditionFailed occurs. See
+  #   http://tickets.opscode.com/browse/CHEF-1788 and
+  #   http://tickets.opscode.com/browse/CHEF-1764.
+  #
+  # According to https://issues.apache.org/jira/browse/COUCHDB-449, setting the 
+  # 'X-Couch-Full-Commit: true' header on the DELETE should work around this issue, 
+  # but it does not.
+  db_created = nil
+  max_tries = 10
+  num_tries = 1
+  while !db_created && num_tries <= max_tries
+    begin
+      cdb.create_db
+      db_created = true
+    rescue Net::HTTPServerException => e
+      unless e.response.code == 412
+        # Re-raise if we got anything but 412.
+        raise
+      end
+      
+      if num_tries <= max_tries
+        Chef::Log.debug("In creating #{target_db} try #{num_tries}/#{max_tries}, got #{e}; try again")
+        sleep 0.25
+      else
+        Chef::Log.error("In creating #{target_db}, tried #{max_tries} times: got #{e}; giving up")
+      end
+    end
+    num_tries += 1
+  end
+  
   cdb.create_id_map
   Chef::Node.create_design_document
   Chef::Role.create_design_document