Symfony services.yaml env custom param condition - symfony

Question

I have a specific variable in my .env.dev.local
SRV_INST=s01
Is there a way to use custom env variables in services.yaml in a conditional way similar to when#dev ? I would like to define some services only when SRV_INST=s01 (something like when %env(SRV_INST)% === 's01').
I can use services.php, but I wanted to know if there's a way to do this in services.yaml

Answer 1

you found a solution - but for anyone else, there are multiple other solutions for this:
services:
App\Mailer:
# the '#=' prefix is required when using expressions for arguments in YAML files
arguments: ["#=container.hasParameter('some_param') ? parameter('some_param') : 'default_value'"]
or
services:
# ...
App\Mail\MailerConfiguration: ~
App\Mailer:
# the '#=' prefix is required when using expressions for arguments in YAML files
arguments: ['#=service("App\\Mail\\MailerConfiguration").getMailerMethod()']
you can find more information at https://symfony.com/doc/current/service_container/expression_language.html

Answer 2

Okay, I solved this by importing a .php additional configuration file.
// config/services.yaml
imports:
- { resource: 'services_conditional.php' }
And the services_conditional.php file:
// config/services_conditional.php
namespace Symfony\Component\DependencyInjection\Loader\Configurator;
use SomeCustom\Service\CustomDoubleBla;
return function (ContainerConfigurator $configurator) {
$services = $configurator->services();
if (!empty($_ENV['SRV_INST']) && $_ENV['SRV_INST'] === 's01') {
$services->set(CustomDoubleBla::class)
->decorate('custom_single_bla.service')
// pass the old service as an argument
->args([service('.inner')]);
}
};