Adds a login_unix_socket option to the postgresql_privs module.

lib/ansible/modules/database/postgresql/postgresql_privs.py

@@ -99,6 +99,12 @@ options:
       - Database port to connect to.
     required: no
     default: 5432
+  unix_socket:
+    description
+      - Path to a Unix domain socket for local connections.
+      - 'Alias: I(login_unix_socket)'
+    required: false
+    default: null
   login:
     description:
       - The username to authenticate with.
@@ -267,6 +273,12 @@ class Connection(object):
         }
         kw = dict( (params_map[k], getattr(params, k)) for k in params_map
                    if getattr(params, k) != '' )
+
+        # If a unix_socket is specified, incorporate it here.
+        is_localhost = "host" not in kw or kw["host"] == "" or kw["host"] == "localhost"
+        if is_localhost and params.unix_socket != "":
+            kw["host"] = params.unix_socket
+
         self.connection = psycopg2.connect(**kw)
         self.cursor = self.connection.cursor()
 
@@ -520,6 +532,7 @@ def main():
                               aliases=['admin_option']),
             host=dict(default='', aliases=['login_host']),
             port=dict(type='int', default=5432),
+            unix_socket=dict(default='', aliases=['login_unix_socket']),
             login=dict(default='postgres', aliases=['login_user']),
             password=dict(default='', aliases=['login_password'])
         ),