Install depends-on without loading system

[fisxoj]

In the exciting, new world of docker, it's a good idea to cache intermediate steps of generating a disk image. In python, for example, that means copying the requirements.txt into the docker image and then running pip install -r requirements.txt to pull down the python modules needed.

For common lisp, it would be nice to be able to do the same thing. I can do this programmatically with

(ql:quickload (asdf:system-depends-on (asdf:find-system :mgl)))

if I wanted to load mgl's dependencies. It would be nice and convenient to do it with a single command, though!

One could imagine doing something like

(ql:quickload :mgl :dependencies-only t)

But I thought about that for all of three seconds and there's probably a better name.

[quicklisp]

You could do something like this:

(in-package :ql-dist-user)
(map nil 'ensure-installed (flatten (dependency-tree "mgl")))

It's not as terse as a new option to quickload, but it works today.

[fisxoj]

Neat! Is that better than the version with asdf in some way?

Feel free to mark as an enhancement or close as you like. It just seemed like there might be a real use case for this, so I figured I'd ask.

On Wed, Jun 15, 2016, 3:31 PM Zach Beane [email protected] wrote:

You could do something like this:

(in-package :ql-dist-user) (map nil 'ensure-installed (flatten (dependency-tree "mgl")))

It's not as terse as a new option to quickload, but it works today.

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[quicklisp]

In my experience, ASDF systems sometimes have implicit dependencies that only become apparent when loading them. Quicklisp's system database explicitly includes them.