Binfmt is global fs. We could check for its inhabitants intersect on
source and destination, but for the 1st time it's enough just to check
this one being empty.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The routines are supposed to provide a DIR * for a givem mountpoint. Currently
it aborts when a mountpoint is overmounted, but this should be fixed eventually.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

These are boolean in reality.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Packet socket need SOL_PACKET one.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We need to dump content of some fs like binfmt_misc, tmpfs, ... To facilitate
this the existing list of filesystems is turned into an array of structures
with dump and restore callbacks. Each FS may declare them they need.

v2: rework encode/decode_fstype not to do it twice.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It's global, so it doesn't require any actions, they should be only mounted.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

If an image isn't specified, crtool shows content of all images.
Now crtools aborts in this case due to BUG_ON(1) in show methods
for raw images. I sugget to skip such images.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Create and bind. Nothing more.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Support only basic packet socket functionality -- create and bind.
This should be enough to start testing dhclient inside container.
Other stuff (filter, mmaps, fanouts, etc.) will come later.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

On restore we typically read an image and put the entries into
some hash/list/whatever to work on them later. It's handy to have
a generic routine for doing so.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Now pie targets depends on protobuf targets.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Reported-by: Andrew Vagin <avagin@parallels.com>
Tested-by: Andrew Vagin <avagin@parallels.com>
Acked-by: Andrew Vagin <avagin@parallels.com>
Looks-good-to: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The crtools produces not only dump in its internal format (i.e. -- pb),
but also may call other tools to create files with some state (e.g.
ip tool dumps route and ifaddr info, tmpfs will be tar-ed, iptables
utility will produce the iptables-save file, etc.).

The show functionality cannot read these images, but we can guess what
can be in the file provided by its magic.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

"init" in LXC opens /dev/null and then mounts devtmpfs in /dev,
so crtools can not resolve the path to the origin /dev/null.

crtools with the option --evasive-devices will check the origin
device and a new device are the same and if it's true, crtools will
dump a new path.

v2: add a description for the option
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This aptch replaces BUG_ON's by return of error code.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The pb_show things are no longer macros.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The pb_read thing is no longer a macros. This will allow to
factor out objects collecting on restore.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The pb_write thing is no longer a macros.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The protobuf-c generate plain routines for entries manipulations, but
we want to have some "generic" way of working with messages. Collect them
all in an array of descriptors (similar to image files descriptions) and
do full typechecking while this.

Such thing will allow to simplfy code later.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

In addition it fixes error handling.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

[xemul: Added explicit braces into ifs]
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

When processes are restored in PIDNS, the controll process (crtools)
don't know a real pid of processes, but it knows a pid of init.

crtools can kill init and all other processes will be killed too.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

When a child exited, SIGCHLD is sent to parent,
if SIGCHLD has handler without SA_RESTART, the current
syscall will be interrupted.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

 - Use sizeof instead of PATH_MAX constant
 - Place EOS exactly after read data end
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Revert and tune 9eda83b7. Andrey reminded me that we have
global instance of cr_options.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

On this stage crtools unlink old socket files, create ghost files and etc,
so we should be in a correct namespace.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The option is -r|--pivot-root and an argument is a path to new root.
A root task will make pivot_root. LXC CT does that, so we need that
for restoring.

v2: s/pivot-root/root/
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The pstree_item for helpers is allocated without rst_info.
Before this patch prepare_fd_pid was executed for such items and
touched rst_info.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The kernel patch is in 3.5 branch, so we can make this test
run automatically.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It's not in zdtm.sh yet, since kernel patch is not yet
committed. When kernel is updated, the zdtm.sh will be too.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Only the fact of the fd presence, its flags and fown and the sigmask.
The sigpending state is tightly coupled with the task's sigpending
state which is not yet supported.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>