Sabayon fixes

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

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

confile: add "force" to cgroup:{mixed,ro,rw} 

If a file descriptor fd is opened by fdopen() and associated with a stream f
will **not** have been dup()ed. This means that fclose(f) will also close the
fd. So never call close(fd) after fdopen(fd) succeeded.
This fixes a double close() Stéphane and I observed when debugging on aarch64
and armf.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

This is really taking a long time for not a lot of benefit.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

This lets users specify

        lxc.mount.auto = cgroup:mixed:force
or
        lxc.mount.auto = cgroup:ro:force
or
        lxc.mount.auto = cgroup:rw:force

When cgroup namespaces are supported LXC will not mount cgroups for the
container since it assumes that the init system will mount cgroups itself if it
wants to. This assumption already broke when users wanted to run containers
without CAP_SYS_ADMIN. For example, systemd based containers wouldn't start
since systemd needs to mount cgroups (named systemd hierarchy for legacy
cgroups and the unified hierarchy for unified cgroups) to track processes. This
problem was solved by detecting whether the container had CAP_SYS_ADMIN. If it
didn't we performed the cgroup mounts for it.
However, there are more cases when we should be able to mount cgroups for the
container when cgroup namespaces are supported:
- init systems not mounting cgroups themselves:
  A init system that doesn't mount cgroups would not have cgroups available
  especially when combined with custom LSM profiles to prevent cgroup
  {u}mount()ing inside containers.
- application containers:
  Application containers will usually not mount by cgroups themselves.
- read-only cgroups:
  It is useful to be able to mount cgroups read-only to e.g. prevent
  changing cgroup limits from inside the container while at the same time
  allowing the applications to perform introspection on their own cgroups. This
  again is mostly useful for application containers. System containers running
  systemd will usually not work correctly when cgroups are mounted read-only.
To be fair, all of those use-cases could be covered by custom hooks or
lxc.mount.entry entries but exposing it through lxc.mount.auto takes care of
setting correct mount options and adding the necessary logic to e.g. mount
filesystem read-only correctly.

Currently we only extend this to cgroup:{mixed,ro,rw} but technically there's
no reason not to enable the same behavior for cgroup-full:{mixed,ro,rw} as
well. If someone requests this we can simply treat it as a bug and add "force"
for cgroup-full.

Replaces #2136.
Signed-off-by: Shukui Yang <yangshukui@huawei.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

cgroups: use correct mask for chmod()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

CODING_STYLE: add coding style file

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

cgfsng: simplifications and fixes

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

lxclock: remove atfork handlers

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

They shouldn't be needed anymore.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Closes #810.
Signed-off-by: Yifeng Tan <tanyifeng1@huawei.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Fix lxc-console hang

The variable 'descr' is mistakenly covered with 'descr_console'.
Signed-off-by: LiFeng <lifeng68@huawei.com>

Modify .gitignore

add:
src/lxc/cmd/lxc-checkconfig
src/lxc/cmd/lxc-update-config
Signed-off-by: LiFeng <lifeng68@huawei.com>

tree-wide: remove legacy codepaths

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

tools: remove non api symbols

conf: fix clearing cgroup settings

console: they are really not necessary

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

coverity: bug smash

fix userns helper error handling

In both of these cases if there is actually an error, we won't close the
pipe and the api call will hang. Instead, let's be sure to close the pipe
before waiting, so that it doesn't hang.
Signed-off-by: Tycho Andersen <tycho@tycho.ws>

Signed-off-by: duguhaotian <duguhaotian@gmail.com>

Dereference after null check
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Dereference after null check
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>