audit: added capacity and reserve() to nlmsg

There are now two (permitted) ways to add data to netlink message:

1. put_xxx()
2. call nlmsg_reserve() to get a pointer to newly reserved room within the
   original netlink message, then write or memcpy data to that area.

Both of them guarantee adding requested length data do not overflow the
pre-allocated message buffer by checking against its cap field first.

And there may be no need to access nlmsg_len outside nl module, because both
put_xxx() and nlmsg_reserve() have alread did that for us.

Signed-off-by: Shuai Zhang <zs.broccoli@gmail.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
Add missing files to ignore list

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Acked-by: Dwight Engen <dwight.engen@oracle.com>
tabs/spaces consistency

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Define a new lxc.init_cmd config option

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Acked-by: Dwight Engen <dwight.engen@oracle.com>
doc: Always include the lxc-top manpage

Since it's no longer written in lua.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
lxc-opensuse: Disabling builds on openSUSE Tumbleweed, detection improved.

Signed-off-by: Johannes Kastl <git@ojkastl.de>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
Issue #278: lxc-start-ephemeral: add --cdir option for cow-mounts

This is a copy of patch version 3 for issue #278 on the issue-tracker:

 - Allow multiple bind-mounts (--bdir) and multiple cow-mounts (--cdir).

 - Further fixes to permissions throughout lxc-start-ephemeral (annotated
   in the code).

Signed-off by: Oleg Freedholm <overlayfs@gmail.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
Allow lxc_clear_config_item to clear idmaps.

Ran into this when trying to automate stgraber's "GUI in containers"
post.

Signed-off-by: Casey Marshall <casey.marshall@canonical.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
Revert "audit: added capacity and reserve() to nlmsg"

This reverts commit 55ae7edb18c503a4b869dd0089f25f03a05a6563.

This change caused hangs in the testsuite, specifically with lxc-user-nic.

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