Comment # 5 on bug 1224066 from Aleksa Sarai

(In reply to Alexandre Vicenzi from comment #3)
> There is official documentation that describes manual steps post-install on
> Linux, see https://docs.docker.com/engine/install/linux-postinstall/.
> 
> I don't classify this as a bug, but rather well-known behavior. Changes to
> the Docker package would be a feature request.
> 
> Aleksa, should we add users to groups in %post/%posttrans scripts?

Access to the docker group gives you admin privileges to the machine (it is
trivial to get root host access using Docker) and so automatically adding users
seems like a bad idea in general. We also don't know which users we should add
to the group at install time anyway.

(In reply to Martin von Reichenberg from comment #2)
> So the point is that there is no mention (the one similar to VirtualBox)
> about the current user  is supposed to be part of the Docker group which
> could easily be set in %post / %posttrans script as: `usermod -aG $USER
> docker` (or equivalent...).

(In reply to Martin von Reichenberg from comment #4)
> But it is a formerly missing information by those who maintain it - As a
> post installation step / notification about what needs to be done in order
> to use the software.

I don't see anything in the VirtualBox spec file which would tell users about
the vboxusers group at install time. If you want, we can add a line in the
package documentation about the docker group, but the fact that you need to be
part of the docker group to administer Docker is incredibly common knowledge
for users of Docker. As mentioned above, this is mentioned already by the
upstream documentation.