fix btrfs_recursive_destroy

Signed-off-by: Oleg Freedholm <overlayfs@gmail.com>

switch user facing name to lxc.rootfs.backend

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

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

rootfs.bdev_type: implement get and clear

clear is just set(x, ""), but before this patch that didn't work bc
"" is nota valid bdev type.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

use more accurate bdev_type name for rootfs.bdev

It'll make future code reading easier.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

2016 04 02/bdev

If that is specified, then we only use the specified backing store type.

This can be useful if you know that lxc.rootfs is a directory type and
you do not want lxc to waste time searching for zfs, btrfs, etc.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

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

A change in kernel 4.2 caused btrfs_recursive_destroy to
fail to delete unprivileged containers.  This patch restores
the pre-kernel-4.2 behaviour.  Ref: Issue 935.
Signed-off-by: Oleg Freedhom <overlayfs@gmail.com>

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

c/r: support for the criu pageserver

Signed-off-by: Niklas Eiling <niklas.eiling@rwth-aachen.de>

Fix buffer overflow in do_start()

Signed-off-by: Aleksandr Mezin <mezin.alexander@gmail.com>

this enables lxc to perform "disk-less migrations" where memory pages are sent directly to the destination machine instead of being written to the sources filesystem first.
For this, the migrate_opts struct has been added the strings "pageserver_address" and "pageserver_port" so that criu can be told where to look for a pageserver.
Signed-off-by: Niklas Eiling <niklas.eiling@rwth-aachen.de>

fix possible buffer overflow

Signed-off-by: Niklas Eiling <niklas.eiling@rwth-aachen.de>

update Debian release names

Squeeze is EOL now, Stretch is the upcoming stable
Signed-off-by: Evgeni Golov <evgeni@golov.de>

strncat only returns its first argument and not the end of the written string.
Thus "buf-pos" is always 0 and consquently no range check is performed.
Signed-off-by: Niklas Eiling <niklas.eiling@rwth-aachen.de>

use smarter error handling for lxc_strmmap()

Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

also ingore *.so.*

Additionally, fix the comment for lxc_strmmap() and cleanup #includes in
utils.{c,h}.
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

lxc-ubuntu: Fix building on secondary architectures

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

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

add funs to mmap() files to \0-terminated strings

Rename lxc_mmap()/lxc_munmap() to lxc_strmmap()/lxc_strmunmap().
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

In order to do this we make use of the MAP_FIXED flag of mmap(). MAP_FIXED
should be safe to use when it replaces an already existing mapping. To this
end, we establish an anonymous mapping that is one byte larger than the
underlying file. The pages handed to us are zero filled.  Now we establish a
fixed-address mapping starting at the address we received from our anonymous
mapping and replace all bytes excluding the additional \0-byte with the file.
This allows us to use normal string-handling function. The idea implemented
here is similar to how shared libraries are mapped.
Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>

start: only use host's /dev/null when absolutely necessary

See comments for details, but basically, only use the host's /dev/null when
absolutely necessary (i.e. there is no reasonable /dev/null in the
container).
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>

always provide a default mirror for debootstraping Ubuntu

only enable Debian's main repository by default