In that case containers will be able to mount cgroup filesystems
for themselves as they do on a host.

This fixes inability to start systemd based containers on cgns-enabled
kernels with cgmanager not running.

I've tested debian jessie, busybox, ubuntu trusty and xenial, all of
which booted ok.  However if there are some setups which require
premounted cgroupfs (i.e. they don't mount if they detect being in
a container), this may cause trouble.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

Update Japanese man

Update for commit 02e5d92bSigned-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>

Update for commit e986ea3dSigned-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>

update manpages

- add note to lxc-clone manpage that it is superseded by lxc-copy
- add note to lxc-start-ephemeral manpage that it is superseded by lxc-copy
- fix typo in lxc-attach manpage
- fix some of my comments in lxc_ls.c
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

update lxc-attach manpage

- explain rationale behind allocation of pty
- briefly explain how a pty is allocated
- add a short note that describes the changed behavior for lxc-attach when the
  user is not placed in a writeable cgroup at login
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>

lxc-attach: add comment, & implement login_tty()

- The code required to prepare an fd to act as a login tty is shared among
  pty_on_host_callback() and fork_pty(). This implements login_pty(), a
  minimalistic login_tty() clone, to avoid code redundancy.
- Give pty_in_container() a slightly extended comment.
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

doc: Add Japanese description of cgns apparmor profile in lxc.container.conf(5)

Update for commit 7a126ae1Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>

2016 02 21/cgns.aa

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

Also document 'unchanged' which we had never documented before.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

Because containers need to - and safely can - mount cgroufs in that
case.

Note that if cgns is enabled but the unshare fails, we fail the container
start, so checking whether they are enabled is enough.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

This isn't safe for privileged containers which do not use cgroup
namespaces, but is required for systemd containers with cgroup
namespaces.  So create a new profile for it which lxc will use as
the default when it knows it can.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

fix android build

bionic libc doesn't know _Exit(). Replace it with _exit().
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

make lxc-attach use a pty

So far lxc-attach did not use a pty when attaching to a container. This made it
vulnerable to tty input faking via TIOCSTI when switching to a different user.
This patch makes lxc-attach use a pty in most cases. The only current exemption
is when stdin, stdout, and stderr are not referring to a pty.

There are two ways how lxc-attach can receive a pty:
	1. get a pty in the container
	2. get a pty on the host
This patch makes 1. the default and only opts for 2. when 1. fails before
giving up. The rationale behind this is as follows: If we create a pty on the
host (2.) and pass the fds to the container the container may report "no tty"
when the "tty" command is used. This could be irritating for users when they
expect that lxc-attach now always tries to use a pty. Hence, option 1. is the
default.
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

lxc_console_cb_tty_masterfd() unnecessarily reported a read/write error when
the fd was closed. This happens e.g. when we have allocated a tty in the
container with lxc-console and we shut the container down. lxc-console will
then exit with an error message. This patch introduces a test whether the
EPOLLHUP bit is set in the events mask. If so, we report no error.
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

Make lxc_console_set_stdfds useable by other callers that do not have access to
lxc_handler.
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

- lxc_console_cb_tty_stdin()
- lxc_console_cb_tty_master()
- lxc_setup_tios(int fd, struct termios *oldtios);
- lxc_console_winsz(int srcfd, int dstfd);
- lxc_console_cb_sigwinch_fd(int fd, uint32_t events, void *cbdata,
	struct lxc_epoll_descr *descr);
- lxc_tty_state *lxc_console_sigwinch_init(int srcfd, int dstfd);
- lxc_console_sigwinch_fini(struct lxc_tty_state *ts);

We can make use these functions in other modules.
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

We want to reuse lxc_console_cb_tty_stdin() in lxc_attach.c.
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

Fix sshd template on systems with systemd

Systems with systemd have /sbin/init as a symlink pointing to real init.
Sshd template tries to bind-mount special init implementation.
The problem is that one cannot bind-mount to a location that is a symlink.

Fix this by deferencing /sbin/init symling and using that as bind-mount location.
Signed-off-by: Nikolay Martynov <mar.kolya@gmail.com>

Update for commit c4cafa08Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>

Fix typo in lxc manpage

Reported-by: lintian
Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>

2016 02 19/cgfs

When containers have lxcfs mounted instead of cgroupfs, we have to
process /proc/self/mountinfo a bit differently.  In particular, we
should look for fuse.lxcfs fstype, we need to look elsewhere for the
list of comounted controllers, and the mount_prefix is not a cgroup path
which was bind mounted, so we should ignore it, and named subsystems
show up without the 'name=' prefix.

With this patchset I can start containers inside a privileged lxd
container with lxcfs mounted (i.e. without cgroup namespaces).

Closes #830
Signed-off-by: Ubuntu <ubuntu@localhost.localdomain>

Because that's what lxcfs gives us.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

cgroups: do not fail if setting devices cgroup fails due to EPERM

If we're trying to allow a device which was denied to our parent
container, just continue.

Cgmanager does not help us to distinguish between eperm and other
errors, so just always continue.

We may want to consider actually computing the range of devices
to which the container monitor has access, but OTOH that introduces
a whole new set of complexity to compute access sets.

Closes #827
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

cast NULL pointers passed to execl*()

NULL pointers passed to execl*() functions must be cast to (char *)NULL since
they are variadic functions.
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>