guix docker on gitlab-ci

[Graham Addis]

Dear people,

I tried to create a docker image to use in a gitlab-ci instance but it
failed because I couldn't use --entry-point="bin/sh -l -c" or
equivalent, basically the gitlab-runner complains that it can't run
binaries.

I've managed to get it working by making some changes to guix/scripts/pack.scm

Adding a fn in docker-image, just before the call to
build-docker-image, to create a list from the string passed in from
--entry-point="bin/sh -l -c"

            (define (make-docker-exec-form prefix value)
              (cond
               ((equal? value '())
                '())
               ((equal? prefix '())
                (string-split value #\space))
               (else
                (let ((values (string-split value #\space)))
                  (cons
                   (string-append prefix "/" (car values))
                   (cdr values))))))

And replacing the setting of entry-point in the build-docker-image call to:

                                #:entry-point (make-docker-exec-form
#$profile #$entry-point)

The call to build-docker-image takes a list for entry-point, and it
all works fine as far as I can tell.

Before I send in a patch, some questions:

Am I missing something?

Am I on the right track?

Should I be splitting this out before the call to docker-image?

Thanks,

Graham