Two gotchas when your Laravel app shells out to a CLI
TL;DR If a web request shells out to a slow CLI ( docker , kubectl , rsync …), move it to a queued job — PHP-FPM/nginx will kill it at ~30s anyway. Processes spawned from an HTTP worker inherit almost no environment : no HOME , a bare PATH . Tools that read ~/.docker or ~/.kube silently fail. Inject the env explicitly. Wrap the shell-out in a driver/contract so you can fake it in tests instead of…
When running a Laravel application and having it execute commands through the command-line interface (CLI), there are two important considerations to keep in mind.
Firstly, the actual execution of a lengthy command should not be performed within a web request. This is because web requests have a limited time frame, often around 30 seconds, due to configuration settings in nginx/PHP-FPM. If the command runs for longer than this, the web request will be cut off, resulting in a 504 error for the browser.
Additionally, if the processing takes longer, there is no guarantee that the request will provide any feedback on whether the operation was successful or failed midway through. To avoid these issues, it is recommended to separate the command execution from the web request. This can be achieved by validating the input, dispatching a job, and returning an immediate response.
The actual command execution should then be handled by a queued job, which can take longer without impacting the user experience. The job can provide progress updates and handle retries cleanly.
Secondly, when spawning a process from within an HTTP worker, such as from a Laravel controller, it is important to be aware that the child process will inherit a very limited environment. This means that variables like HOME and PATH will not be present, which can cause issues when using tools like Docker or Kubernetes, which rely on these variables to function properly.
To overcome this limitation, it is necessary to explicitly set the required environment variables when creating the child process. This can be done using the Symfony Process component, which allows you to define the environment variables explicitly. In the example provided, the HOME and PATH variables are set to specific values, while the KUBECONFIG variable is set to a specific path, ensuring that the tools such as docker and kubectl have the necessary configuration to operate correctly.
This approach not only resolves the immediate issue, but also makes the code more testable, as running real CLI tools in a testing environment may not be desirable. By encapsulating the command execution within a contract and providing a mock implementation for testing purposes, you can ensure that your application behaves as expected without the need for a real CLI environment during the testing phase.
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