[Bug 1169593] New: Creates /.docker

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1169593

            Bug ID: 1169593
           Summary: Creates /.docker
           Product: Fedora
           Version: rawhide
         Component: docker-io
          Assignee: lsm5(a)redhat.com
          Reporter: walters(a)redhat.com
        QA Contact: extras-qa(a)fedoraproject.org
                CC: admiller(a)redhat.com, golang(a)lists.fedoraproject.org,
                    hushan.jia(a)gmail.com, jchaloup(a)redhat.com,
                    jperrin(a)centos.org, lsm5(a)redhat.com,
                    mattdm(a)redhat.com, mgoldman(a)redhat.com,
                    miminar(a)redhat.com, s(a)shk.io, thrcka(a)redhat.com,
                    vbatts(a)redhat.com



On Atomic, docker-io-1.3.2-3.git353ff40 fails to start:

Dec 01 22:12:17 localhost.localdomain docker[816]:
time="2014-12-01T22:12:17-05:00" level="fatal" msg="mkdir
.docker: permission
denied"

My magic 8 ball^copy of git grep says:

$ git grep -i dir.*\\.docker
docker/flags.go:                dockerCertPath = filepath.Join(getHomeDir(),
".docker")

What's that doing?  Well, when docker is started on the system, it doesn't have
a home directory, it's just /.

So on a mainline system, since docker runs with all privileges, it happily does
mkdir("/.docker").

This fails on Atomic due to the protection from:
https://bugzilla.gnome.org/show_bug.cgi?id=728006

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