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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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10
docs/apibuild.py
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@@ -33,6 +33,11 @@ qemu_included_files = {
"libvirt-qemu.c": "Implementations for the QEMU specific APIs",
}
lxc_included_files = {
"libvirt-lxc.h": "header with LXC specific API definitions",
"libvirt-lxc.c": "Implementations for the LXC specific APIs",
}
ignored_words = {
"ATTRIBUTE_UNUSED": (0, "macro keyword"),
"ATTRIBUTE_SENTINEL": (0, "macro keyword"),
@@ -1945,6 +1950,8 @@ class docBuilder:
self.includes = includes + included_files.keys()
elif name == "libvirt-qemu":
self.includes = includes + qemu_included_files.keys()
elif name == "libvirt-lxc":
self.includes = includes + lxc_included_files.keys()
self.modules = {}
self.headers = {}
self.idx = index()
@@ -2463,7 +2470,7 @@ class docBuilder:
def rebuild(name):
if name not in ["libvirt", "libvirt-qemu"]:
if name not in ["libvirt", "libvirt-qemu", "libvirt-lxc"]:
self.warning("rebuild() failed, unknown module %s") % name
return None
builder = None
@@ -2506,6 +2513,7 @@ if __name__ == "__main__":
else:
rebuild("libvirt")
rebuild("libvirt-qemu")
rebuild("libvirt-lxc")
if warnings > 0:
sys.exit(2)
else: