Use unix.Eventfd() instead of calling manually reimplementing it using
the raw syscall. Also use the correct corresponding unix.EFD_CLOEXEC
flag instead of unix.FD_CLOEXEC (which can have a different value on
some architectures and thus might lead to unexpected behavior).
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
And Stat_t.PID and Stat_t.Name while we're at it. Then use the new
.State property in runType to distinguish between running and
zombie/dead processes, since kill(2) does not [1]. With this change
we no longer claim Running status for zombie/dead processes.
I've also removed the kill(2) call from runType. It was originally
added in 13841ef3 (new-api: return the Running state only if the init
process is alive, 2014-12-23), but we've been accessing
/proc/[pid]/stat since 14e95b2a (Make state detection precise,
2016-07-05, #930), and with the /stat access the kill(2) check is
redundant.
I also don't see much point to the previously-separate
doesInitProcessExist, so I've inlined that logic in runType.
It would be nice to distinguish between "/proc/[pid]/stat doesn't
exist" and errors parsing its contents, but I've skipped that for the
moment.
The Running -> Stopped change in checkpoint_test.go is because the
post-checkpoint process is a zombie, and with this commit zombie
processes are Stopped (and no longer Running).
[1]: https://github.com/opencontainers/runc/pull/1483#issuecomment-307527789
Signed-off-by: W. Trevor King <wking@tremily.us>
And convert the various start-time properties from strings to uint64s.
This removes all internal consumers of the deprecated
GetProcessStartTime function.
Signed-off-by: W. Trevor King <wking@tremily.us>
Use KeyctlJoinSessionKeyring, KeyctlString and KeyctlSetperm from
golang.org/x/sys/unix instead of manually reimplementing them.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
And use it only in local tooling that is forwarding the pseudoterminal
master. That way runC no longer has an opinion on the onlcr setting
for folks who are creating a terminal and detaching. They'll use
--console-socket and can setup the pseudoterminal however they like
without runC having an opinion. With this commit, the only cases
where runC still has applies SaneTerminal is when *it* is the process
consuming the master descriptor.
Signed-off-by: W. Trevor King <wking@tremily.us>
Use the NLA_ALIGNTO and NLA_HDRLEN constants from x/sys/unix instead of
syscall, as the syscall package shouldn't be used anymore (except for a
few exceptions).
This also makes the syscall_NLA_HDRLEN workaround for gccgo unnecessary.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Use the symlink xattr syscall wrappers Lgetxattr, Llistxattr and
Lsetxattr from x/sys/unix (introduced in
golang/sys@b90f89a1e7) instead of
providing own wrappers. Leave the functionality of system.Lgetxattr
intact with respect to the retry with a larger buffer, but switch it to
use unix.Lgetxattr.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Follow commit 3d7cb4293c ("Move libcontainer to x/sys/unix") and also
move the examples in README.md from syscall to x/sys/unix.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Since syscall is outdated and broken for some architectures,
use x/sys/unix instead.
There are still some dependencies on the syscall package that will
remain in syscall for the forseeable future:
Errno
Signal
SysProcAttr
Additionally:
- os still uses syscall, so it needs to be kept for anything
returning *os.ProcessState, such as process.Wait.
Signed-off-by: Christy Perez <christy@linux.vnet.ibm.com>
* User Case:
User could use prestart hook to add block devices to container. so the
hook should have a way to set the permissions of the devices.
Just move cgroup config operation before prestart hook will work.
Signed-off-by: Wentao Zhang <zhangwentao234@huawei.com>
FreeBSD does not support cgroups or namespaces, which the code suggested, and is not supported
in runc anyway right now. So clean up the file naming to use `_linux` where appropriate.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
A freezer cgroup allows to dump processes faster.
If a user wants to checkpoint a container and its storage,
he has to pause a container, but in this case we need to pass
a path to its freezer cgroup to "criu dump".
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
When C/R was implemented, it was enough to call manager.Set to apply
limits and to move a task. Now .Set() and .Apply() have to be called
separately.
Fixes: 8a740d5391 ("libcontainer: cgroups: don't Set in Apply")
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Instead of relying on version numbers it is possible to check if CRIU
actually supports certain features. This introduces an initial
implementation to check if CRIU and the underlying kernel actually
support dirty memory tracking for memory pre-dumping.
Upstream CRIU also supports the lazy-page migration feature check and
additional feature checks can be included in CRIU to reduce the version
number parsing. There are also certain CRIU features which depend on one
side on the CRIU version but also require certain kernel versions to
actually work. CRIU knows if it can do certain things on the kernel it
is running on and using the feature check RPC interface makes it easier
for runc to decide if the criu+kernel combination will support that
feature.
Feature checking was introduced with CRIU 1.8. Running with older CRIU
versions will ignore the feature check functionality and behave just
like it used to.
v2:
- Do not use reflection to compare requested and responded
features. Checking which feature is available is now hardcoded
and needs to be adapted for every new feature check. The code
is now much more readable and simpler.
v3:
- Move the variable criuFeat out of the linuxContainer struct,
as it is not container specific. Now it is a global variable.
Signed-off-by: Adrian Reber <areber@redhat.com>
The original implementation is in C, which increases cognitive load and
possibly might cause us problems in the future. Since sys/unix is better
maintained than the syscall standard library switching makes more sense.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Michael Crosby
Mrunal Patel
Tobias Klauser
W. Trevor King
Kang Liang
Daniel, Dao Quang Minh
Qiang Huang
Christy Perez
Wentao Zhang
Justin Cormack
Harshal Patil
Andrei Vagin
chchliang
CuiHaozhi
Adrian Reber
Aleksa Sarai