replace passing of pid and console path via environment variable with passing
them with netlink message via an established pipe.
this change requires us to set _LIBCONTAINER_INITTYPE and
_LIBCONTAINER_INITPIPE as the env environment of the bootstrap process as we
only send the bootstrap data for setns process right now. When init and setns
bootstrap process are unified (i.e., init use nsexec instead of Go to clone new
process), we can remove _LIBCONTAINER_INITTYPE.
Note:
- we read nlmsghdr first before reading the content so we can get the total
length of the payload and allocate buffer properly instead of allocating
one large buffer.
- check read bytes vs the wanted number. It's an error if we failed to read
the desired number of bytes from the pipe into the buffer.
Signed-off-by: Daniel, Dao Quang Minh <dqminh89@gmail.com>
add bootstrap data to setns process. If we have any bootstrap data then copy it
to the bootstrap process (i.e. nsexec) using the sync pipe. This will allow us
to eventually replace environment variable usage with more structured data
to setup namespaces, write pid/gid map, setgroup etc.
Signed-off-by: Daniel, Dao Quang Minh <dqminh89@gmail.com>
When starting and quering for pids a container can start and exit before
this is set. So set the opts after the process is started and while
libcontainer still has the container's process blocking on the pipe.
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
While testing different versions of criu it helps to know which
criu binary with which options is currently used. Therefore additional
debug output to display these information is added.
v2: increase readability of printed out criu options
Signed-off-by: Adrian Reber <adrian@lisas.de>
Here are two reasons:
* If we use systemd, we need to ask it to create cgroups
* If a container is restored with another ID, we need to
change paths to cgroups.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
This adds a `Signal()` method to the container interface so that the
initial process can be signaled after a Load or operation. It also
implements signaling the init process from a nonChildProcess.
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
A boolean field named GidMappingsEnableSetgroups was added to
SysProcAttr in Go1.5. This field determines the value of the process's
setgroups proc entry.
Since the default is to set the entry to 'deny', calling setgroups will
fail on systems running kernels 3.19+.
Set GidMappingsEnableSetgroups to true so setgroups wont be set to
'deny'.
Signed-off-by: Ido Yariv <ido@wizery.com>
Actually cgroup mounts are bind-mounts, so they should be
handled by the same way.
Reported-by: Ross Boucher <rboucher@gmail.com>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Daniel, Dao Quang Minh
Michael Crosby
Mrunal Patel
John Howard
Mrunal Patel
Adrian Reber
Hui Kang
David Calavera
Andrey Vagin
boucher
Ido Yariv
mapk0y
unclejack