Adds a login_unix_socket option to the postgresql_db module.

database/postgresql/postgresql_db.py

@@ -44,6 +44,11 @@ options:
       - Host running the database
     required: false
     default: localhost
+  login_unix_socket:
+    description
+      - Path to a Unix domain socket for local connections
+    required: false
+    default: null
   owner:
     description:
       - Name of the role to set as owner of the database
@@ -226,6 +231,7 @@ def main():
             login_user=dict(default="postgres"),
             login_password=dict(default=""),
             login_host=dict(default=""),
+            login_unix_socket=dict(default=""),
             port=dict(default="5432"),
             db=dict(required=True, aliases=['name']),
             owner=dict(default=""),
@@ -262,6 +268,12 @@ def main():
     }
     kw = dict( (params_map[k], v) for (k, v) in module.params.iteritems()
               if k in params_map and v != '' )
+
+    # If a login_unix_socket is specified, incorporate it here.
+    is_localhost = "host" not in kw or kw["host"] == "" or kw["host"] == "localhost"
+    if is_localhost and module.params["login_unix_socket"] != "":
+        kw["host"] = module.params["login_unix_socket"]
+
     try:
         db_connection = psycopg2.connect(database="template1", **kw)
         # Enable autocommit so we can create databases