Fixed #26751 -- Made dbshell exit with the shell's error code.

django/db/backends/mysql/client.py

@@ -39,4 +39,4 @@ class DatabaseClient(BaseDatabaseClient):
 
     def runshell(self):
         args = DatabaseClient.settings_to_cmd_args(self.connection.settings_dict)
-        subprocess.call(args)
+        subprocess.check_call(args)

django/db/backends/oracle/client.py

@@ -9,4 +9,4 @@ class DatabaseClient(BaseDatabaseClient):
     def runshell(self):
         conn_string = self.connection._connect_string()
         args = [self.executable_name, "-L", conn_string]
-        subprocess.call(args)
+        subprocess.check_call(args)

django/db/backends/postgresql/client.py

@@ -55,7 +55,7 @@ class DatabaseClient(BaseDatabaseClient):
                     # If the current locale can't encode the data, we let
                     # the user input the password manually.
                     pass
-            subprocess.call(args)
+            subprocess.check_call(args)
         finally:
             if temp_pgpass:
                 temp_pgpass.close()

django/db/backends/sqlite3/client.py

@@ -9,4 +9,4 @@ class DatabaseClient(BaseDatabaseClient):
     def runshell(self):
         args = [self.executable_name,
                 self.connection.settings_dict['NAME']]
-        subprocess.call(args)
+        subprocess.check_call(args)