Problem with ctrl+C signal (does not stop the command)

[Wirone]

We currently have problem with ctrl+C signal (does not stop the command when run in Docker). The fix / check commands must stop gracefully when SIGTERM is invoked.

$ docker run --rm -it -v $(pwd):/code ghcr.io/php-cs-fixer/php-cs-fixer:3-php8.3 check

and then ctrl+C should stop the command.

Originally posted by @Wirone in #7782 (comment)

[Wirone]

It looks like it moving pcntl to the lower layer and including it in the Docker image does not solve the problem anyway, but running Docker container with --init makes ctrl+C work properly 🤔.

The change in #7782 is correct anyway, because symfony/console requires pcntl to work with signals.

[Wirone]

@hgiesenow do you know what can be the root cause of Fixer not reacting to ctrl+C when running with docker run? When I run Fixer inside container and use ctrl+C inside the container, the Fixer's process stops properly.

$ docker run --rm -it --init -v $(pwd):/code --entrypoint="" fixer:local sh
/code # php-cs-fixer check
PHP CS Fixer 3.48.1-DEV Small Changes by Fabien Potencier, Dariusz Ruminski and contributors.
PHP runtime: 8.3.2
Loaded config default from "/code/.php-cs-fixer.php".
    0/1070 [░░░░░░░░░░░░░░░░░░░░░░░░░░░░]   0%^C
/code #

fixer:local image used above is a local build (docker build --target dist -t fixer:local .) on branch with correct pcntl.