fedora images do lack a default command to run

[ssbarnea]

This was initially reported on ansible/ansible#50951 as it was discovered while trying to test ansible-molecule on fedora sytems. With centos images it did work without any problem.

$ docker run -it fedora:28
docker: Error response from daemon: No command specified.

Running docker image inspect fedora:28 uncovered the fact that Cmd is null and this is what caused the issue. On CentOS image Cmd is /bin/bash.

Please fix this and rebuild images for fedora:28 and newer. Updating fedora:28 image is quite important as this is the base used by RHEL8/CentOS8 and the work being done for in preparation for these.

[cverna]

This is weird we have the CMD set to /bin/bash see https://github.com/fedora-cloud/docker-brew-fedora/blob/master/Dockerfile#L17 and it used to work on previous images.

I ll investigate why the this is not working anymore

[cverna]

@ssbarnea if this is blocking you in the mean time you can pull the base images from fedora registry, I just check and it works

$ podman run -it registry.fedoraproject.org/fedora:28
[root@6ede57ec4f8f /]# 

[cverna]

This is weird we have the CMD set to /bin/bash see https://github.com/fedora-cloud/docker-brew-fedora/blob/master/Dockerfile#L17 and it used to work on previous images.

I ll investigate why the this is not working anymore

So I think the error is that the dockerfile we use in the script to that generates the image did not have the CMD

I pushed ab933e7 to fix that and will prepare a new release. Depending on when the docker folks will review the change it should take ~1 day to be available in docker hub

[ssbarnea]

@cverna Thanks for fixing this. Maybe you also want to update the test command to assure that you can run the container without a custom command -- jus to avoid accidental regression in the future.

Do you know how long it takes for the docker.io to be updated? I will try to reconfigure molecule to use fedora registry directly, I hope it can do that.

[cverna]

@ssbarnea , I have opened docker-library/official-images#5302 now it is up to the docker team to review and merge the PR. It is generally does not take more than 1 day, I think the new image will be available tomorrow.

[cverna]

@ssbarnea This should be now fixed, can you confirm and close the issue if that's the case ?

Thanks

[ssbarnea]

Yes, it works and thanks for the help on this!

[cverna]

No problem thanks for reporting the issue 👍