Re: master 152c7322c1: * lisp/net/tramp-docker.el: New file.

[Brian Cully via "Emacs development discussions." <emacs-devel@gnu.org>]

On 9/29/22 13:28, Michael Albinus wrote:
> miha@kamnitnik.top writes:
>> It's not unusual to have both podman and docker containers on the same
>> host. But the way tramp-docker.el is arranged currently, it's difficult
>> to have simultaneous tramp connections to both of them. I think it would
>> make sense to have two tramp methods: '/docker:' and '/podman:', and by
>> extension, two defcustoms: tramp-docker-program and
>> tramp-podman-program.
> 
> I agree. Especially, when we have multi-hops to different machines,
> which could offer either docker or podman executables.
> 
> Brian?

Indeed. I hadn't considered this use-case (even though I also have both 
installed, though I only use Tramp with Podman containers for 
development purposes).

As the package is really not much more than the method and variable 
customization options, it may be best to just have duplicates for those 
(eg, both `tramp-docker-program' and `tramp-podman-program'). The 
completion code could be shared, but I'm unsure how higher-level code 
organization would work. My first pass would be to have a single 
`tramp-docker--completion-function' which is used for both the 
`tramp-podman-method' as well as `tramp-docker-method'. My rationale 
being that Podman explicitly copies the Docker command line so that at 
can be used as a drop-in replacement, so the completion function would 
more naturally be associated with Docker than Podman.

-bjc