pack: Allow setting a custom image tag for Docker images

Previously, the image repository name was automatically computed from
the packages in the manifest without allowing the user to set a custom
one. As such, changing the packages in the manifest would result in a
new image name. Thereby requiring updating documentation et cetera when
using `docker load` directory on the resulting image.

Inspired by `docker build -t`, this commit adds a new Docker-specific
option to `guix pack` which allows setting a custom repository name for
the resulting image. If this option is not specified, pack falls back
to computing the name from the manifest. Therefore, this change is
entirely backwards compatible.

Documentation has been added with: 373ec2cf8ce97d5f89191c3d9211ee3a5c2067dc.

* guix/scripts/pack.scm (guix-pack): Add --image-tag option.
(%docker-format-options): New constant.
(show-docker-format-options): New procedure.
(show-docker-format-options/detailed): New procedure.
(docker-image): Allow setting a custom
repository name for the created docker image via extra-options.

Signed-off-by: Sören Tempel <soeren@soeren-tempel.net>
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>

0 files changed, 0 insertions, 0 deletions