[tarantool-patches] [PATCH 2/3] Allow use existing user

[AKhatskevich]

This commit allows to create vshard user outside of vshard.

This feature is tested in the next commit (destroy).

Closes #52
---
 vshard/storage/init.lua | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/vshard/storage/init.lua b/vshard/storage/init.lua
index 57076e1..059e705 100644
--- a/vshard/storage/init.lua
+++ b/vshard/storage/init.lua
@@ -138,11 +138,19 @@ end
 --------------------------------------------------------------------------------
 -- Schema
 --------------------------------------------------------------------------------
+local function create_user(username, password)
+    box.schema.user.create(username, {
+        password = password,
+        if_not_exists = true,
+    })
+    -- Replication may has not been granted, if user exists.
+    box.schema.user.grant(username, 'replication', nil, nil,
+                          {if_not_exists = true})
+end
 
 local function storage_schema_v1(username, password)
     log.info("Initializing schema")
-    box.schema.user.create(username, {password = password})
-    box.schema.user.grant(username, 'replication')
+    create_user(username, password)
 
     local bucket = box.schema.space.create('_bucket')
     bucket:format({
-- 
2.14.1