Jeroen Hoekx
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plugins/inventory/yaml.py
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plugins/inventory/yaml.py
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#!/usr/bin/env python
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# Support a YAML file hosts.yml as external inventory in Ansible
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# Copyright (C) 2012 Jeroen Hoekx <jeroen@hoekx.be>
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#
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# This program 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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# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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File format:
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- <hostname>
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or
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- host: <hostname>
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vars:
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- myvar: value
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- myvbr: vblue
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groups:
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- mygroup1
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- mygroup2
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or
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- group: <groupname>
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vars:
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- groupvar: value
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hosts:
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- myhost1
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- myhost2
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groups:
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- subgroup1
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- subgroup2
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Any statement except the first definition is optional.
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"""
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import json
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import os
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import sys
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from optparse import OptionParser
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import yaml
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class Host():
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def __init__(self, name):
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self.name = name
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self.groups = []
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self.vars = {}
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def __repr__(self):
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return "Host('%s')"%(self.name)
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def set_variable(self, key, value):
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self.vars[key] = value
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def get_variables(self):
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result = {}
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for group in self.groups:
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for k,v in group.get_variables().items():
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result[k] = v
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for k, v in self.vars.items():
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result[k] = v
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return result
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def add_group(self, group):
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if group not in self.groups:
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self.groups.append(group)
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class Group():
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def __init__(self, name):
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self.name = name
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self.hosts = []
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self.vars = {}
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self.subgroups = []
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self.parents = []
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def __repr__(self):
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return "Group('%s')"%(self.name)
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def get_hosts(self):
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""" List all hosts in this group, including subgroups """
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result = [ host for host in self.hosts ]
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for group in self.subgroups:
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for host in group.get_hosts():
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if host not in result:
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result.append(host)
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return result
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def add_host(self, host):
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if host not in self.hosts:
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self.hosts.append(host)
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host.add_group(self)
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def add_subgroup(self, group):
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if group not in self.subgroups:
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self.subgroups.append(group)
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group.add_parent(self)
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def add_parent(self, group):
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if group not in self.parents:
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self.parents.append(group)
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def set_variable(self, key, value):
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self.vars[key] = value
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def get_variables(self):
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result = {}
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for group in self.parents:
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result.update( group.get_variables() )
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result.update(self.vars)
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return result
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def find_group(name, groups):
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for group in groups:
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if name == group.name:
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return group
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def parse_vars(vars, obj):
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### vars can be a list of dicts or a dictionary
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if type(vars) == dict:
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for k,v in vars.items():
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obj.set_variable(k, v)
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elif type(vars) == list:
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for var in vars:
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k,v = var.items()[0]
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obj.set_variable(k, v)
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def parse_yaml(yaml_hosts):
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groups = []
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all_hosts = Group('all')
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ungrouped = Group('ungrouped')
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groups.append(ungrouped)
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### groups first, so hosts can be added to 'ungrouped' if necessary
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subgroups = []
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for entry in yaml_hosts:
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if 'group' in entry and type(entry)==dict:
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group = find_group(entry['group'], groups)
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if not group:
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group = Group(entry['group'])
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groups.append(group)
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if 'vars' in entry:
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parse_vars(entry['vars'], group)
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if 'hosts' in entry:
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for host_name in entry['hosts']:
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host = None
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for test_host in all_hosts.get_hosts():
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if test_host.name == host_name:
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host = test_host
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break
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else:
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host = Host(host_name)
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all_hosts.add_host(host)
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group.add_host(host)
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if 'groups' in entry:
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for subgroup in entry['groups']:
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subgroups.append((group.name, subgroup))
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for name, sub_name in subgroups:
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group = find_group(name, groups)
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subgroup = find_group(sub_name, groups)
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group.add_subgroup(subgroup)
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for entry in yaml_hosts:
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### a host is either a dict or a single line definition
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if type(entry) in [str, unicode]:
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for test_host in all_hosts.get_hosts():
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if test_host.name == entry:
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break
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else:
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host = Host(entry)
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all_hosts.add_host(host)
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ungrouped.add_host(host)
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elif 'host' in entry:
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host = None
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no_group = False
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for test_host in all_hosts.get_hosts():
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### all hosts contains only hosts already in groups
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if test_host.name == entry['host']:
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host = test_host
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break
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else:
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host = Host(entry['host'])
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all_hosts.add_host(host)
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no_group = True
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if 'vars' in entry:
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parse_vars(entry['vars'], host)
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if 'groups' in entry:
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for test_group in groups:
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if test_group.name in entry['groups']:
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test_group.add_host(host)
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all_hosts.add_host(host)
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no_group = False
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if no_group:
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ungrouped.add_host(host)
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return groups, all_hosts
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parser = OptionParser()
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parser.add_option('-l', '--list', default=False, dest="list_hosts", action="store_true")
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parser.add_option('-H', '--host', default=None, dest="host")
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parser.add_option('-e', '--extra-vars', default=None, dest="extra")
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options, args = parser.parse_args()
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base_dir = os.path.dirname(os.path.realpath(__file__))
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hosts_file = os.path.join(base_dir, 'hosts.yml')
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with open(hosts_file) as f:
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yaml_hosts = yaml.load( f.read() )
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groups, all_hosts = parse_yaml(yaml_hosts)
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if options.list_hosts == True:
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result = {}
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for group in groups:
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result[group.name] = [host.name for host in group.get_hosts()]
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print json.dumps(result)
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sys.exit(0)
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if options.host is not None:
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result = {}
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host = None
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for test_host in all_hosts.get_hosts():
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if test_host.name == options.host:
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host = test_host
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break
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result = host.get_variables()
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if options.extra:
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k,v = options.extra.split("=")
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result[k] = v
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print json.dumps(result)
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sys.exit(0)
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parser.print_help()
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sys.exit(1)
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