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Introduce an LXC specific public API & library

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This patch introduces support for LXC specific public APIs. In
common with what was done for QEMU, this creates a libvirt_lxc.so
library and libvirt/libvirt-lxc.h header file.

The actual APIs are

  int virDomainLxcOpenNamespace(virDomainPtr domain,
                                int **fdlist,
                                unsigned int flags);

  int virDomainLxcEnterNamespace(virDomainPtr domain,
                                 unsigned int nfdlist,
                                 int *fdlist,
                                 unsigned int *noldfdlist,
                                 int **oldfdlist,
                                 unsigned int flags);

which provide a way to use the setns() system call to move the
calling process into the container's namespace. It is not
practical to write in a generically applicable manner. The
nearest that we could get to such an API would be an API which
allows to pass a command + argv to be executed inside a
container. Even if we had such a generic API, this LXC specific
API is still useful, because it allows the caller to maintain
the current process context, in particular any I/O streams they
have open.

NB the virDomainLxcEnterNamespace() API is special in that it
runs client side, so does not involve the internal driver API.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange
2012-12-21 13:15:19 +00:00
parent 907a39e735
commit 3d1596b048
22 changed files with 707 additions and 13 deletions
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1
include/libvirt/Makefile.am
View File

@@ -6,6 +6,7 @@
virincdir = $(includedir)/libvirt
virinc_HEADERS = libvirt.h \
libvirt-lxc.h \
libvirt-qemu.h \
virterror.h

50
include/libvirt/libvirt-lxc.h Normal file
View File

@@ -0,0 +1,50 @@
/* -*- c -*-
* libvirt-lxc.h: Interfaces specific for LXC driver
* Summary: lxc specific interfaces
* Description: Provides the interfaces of the libvirt library to handle
* LXC specific methods
*
* Copyright (C) 2012-2013 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Author: Daniel P. Berrange <berrange@redhat.com>
*/
#ifndef __VIR_LXC_H__
# define __VIR_LXC_H__
# include "libvirt/libvirt.h"
# ifdef __cplusplus
extern "C" {
# endif
int virDomainLxcOpenNamespace(virDomainPtr domain,
int **fdlist,
unsigned int flags);
int virDomainLxcEnterNamespace(virDomainPtr domain,
unsigned int nfdlist,
int *fdlist,
unsigned int *noldfdlist,
int **oldfdlist,
unsigned int flags);
# ifdef __cplusplus
}
# endif
#endif /* __VIR_LXC_H__ */