Examples to execute from other apps?

[ttodua]

i.e. I use WordPress docker container:

services:
    wordpress:
        image: wordpress:latest
        depends_on:
         - db
        networks:
         - myNetwork
         - backend
        restart: always
    db:
        ...

networks: 
    myNetwork:
        external: true
    backend:
        driver: bridge

From there (php file), I tried to execute exec('yt-dl ....') I get the error in logs, that yt-dl doesn't exist (same if do with exec ('youtube-dl ...'). Can you give a hint, how to make this available in my WP container?

[mikenye]

Hi @ttodua,

I would consider building your own container that includes Wordpress as well as youtube-dl.

An example Dockerfile would start with:

FROM wordpress:latest

Then, copy/paste the mikenye/youtube-dl Dockerfile from line 3 to line 52 (at the time of writing) (so excluding the FROM WORKDIR and ENTRYPOINT lines).

This way, you're installing youtube-dl and all prerequisites into the wordpress container, resulting in a new container.

You would then update your docker-compose.yml file as follows:

services:
    wordpress:
        # image: wordpress:latest
        build:
          context: /path/to/dir/containing/dockerfile
        depends_on:
         - db
        networks:
         - myNetwork
         - backend
        restart: always
    db:
        ...

networks: 
    myNetwork:
        external: true
    backend:
        driver: bridge

You should then be able to use docker-compose build to build the image, and docker-compose up -d to bring the environment up with the new image. If you need to update the container to the latest version of wordpress/youtube-dl in future, just re-run docker-compose build --no-cache and then docker-compose up -d to refresh the environment with the new image.

Once up, you should be able to execute exec('youtube-dl...') within your PHP.

Also, I don't mean to tell you how to suck eggs, but please be very, very careful passing arguments from website user input to the exec function. At a minimum, please use escapeshellarg() or escapeshellcmd() to ensure that users cannot trick the system into executing arbitrary commands. :)

[ttodua]

Hi Mike, thank you for the superb answer! I'll go that way.

[mikenye]

You’re very welcome. Please get in touch if you get stuck or need help!