The systemd support for the devices cgroup lacks two required features:
* Support for wildcards to allow mknod on any device
* Support for wildcards to allow /dev/pts support
The second is available in more recent systemd as "char-pts", but not in e.g. v208 which is in wide use.
Additionally, the current approach of letting systemd set up the devices cgroup and then adding
some devices to it doesn't work, because some times systemd (at least v208) re-initializes
the devices cgroup, overwriting our custom devices. See https://github.com/dotcloud/docker/issues/6009
for the details.
When wildcarded mknod support is available in systemd we should implement a pure systemd version,
but we need to keep the old one around for backwards compat.
Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Upstream-commit: 6b8f0e394b3960bba1db982c62c002221419f3f5
Component: engine
006edb2caf