Flag to set custom docker executable

[imgx64]

Is your feature request related to a problem? Please describe. I'm trying to use docker-compose with podman. Most things work fine, but if docker-compose attempts to build an image, it fails because it has hardcoded docker build command (see here), and is unable to run podman build instead.

I modified the source code to change it to podman, and it worked fine.

Describe the solution you'd like I'd like docker-compose to add a flag to manually select a path to a different docker executable. For example: docker-compose --docker-bin /usr/bin/podman up

Describe alternatives you've considered Building the images manually before running docker-compose up is a workaround for this.

Additional context

[ndeloof]

docker-compose is not a script delegating docker commands to another tool, it's a plain standalone tool which uses the Docker Engine API, just like docker command does.

[imgx64]

In my original post, I linked to the part where docker-compose calls the docker binary to build the image.

https://github.com/docker/compose/blob/0bea52b18dda3de8c28fcfb0c80cc08b8950645e/compose/service.py#L1958

[gotmax23]

@ndeloof Can you please reopen the issue? As @imgx64 said, the docker-compose build function notably does not use the Docker api and instead calls the Docker binary directly.

[ndeloof]

Re-opened as requested, but with Compose v2 being released soon, docker-compose will most probably not get such new features approved.

[gotmax23]

Thanks!

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