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0e6fc9de3a
Enables an LXC server's configuration as an inventory source for LXC containers. In LXC, containers can be defined with an "lxc.group" configuration option that is normally used with lxc-autostart -g. Here, we are using the same option to build Ansible inventory groups. In addition to being grouped according to their lxc.group entry (or entries, as LXC allows a single container to be in multiple groups), we also add all containers (including those with no lxc.group entry) to the "all" group.
67 lines
2.5 KiB
Python
Executable file
67 lines
2.5 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# (c) 2015-16 Florian Haas, hastexo Professional Services GmbH
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# <florian@hastexo.com>
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# Based in part on:
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# libvirt_lxc.py, (c) 2013, Michael Scherer <misc@zarb.org>
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#
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# This file is part of Ansible,
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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"""
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Ansible inventory script for LXC containers. Requires Python
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bindings for LXC API.
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In LXC, containers can be grouped by setting the lxc.group option,
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which may be found more than once in a container's
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configuration. So, we enumerate all containers, fetch their list
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of groups, and then build the dictionary in the way Ansible expects
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it.
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"""
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from __future__ import print_function
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import sys
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import lxc
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import json
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def build_dict():
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"""Returns a dictionary keyed to the defined LXC groups. All
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containers, including the ones not in any group, are included in the
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"all" group."""
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# Enumerate all containers, and list the groups they are in. Also,
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# implicitly add every container to the 'all' group.
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containers = dict([(c,
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['all'] +
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(lxc.Container(c).get_config_item('lxc.group') or []))
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for c in lxc.list_containers()])
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# Extract the groups, flatten the list, and remove duplicates
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groups = set(sum([g for g in containers.values()], []))
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# Create a dictionary for each group (including the 'all' group
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return dict([(g, {'hosts': [k for k, v in containers.items() if g in v],
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'vars': {'ansible_connection':'lxc'}}) for g in groups])
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def main(argv):
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"""Returns a JSON dictionary as expected by Ansible"""
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result = build_dict()
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if len(argv) == 2 and argv[1] == '--list':
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json.dump(result, sys.stdout)
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elif len(argv) == 3 and argv[1] == '--host':
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json.dump({'ansible_connection': 'lxc'}, sys.stdout)
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else:
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print("Need an argument, either --list or --host <host>", file=sys.stderr)
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if __name__ == '__main__':
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main(sys.argv)
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