mirror of
https://github.com/thegeeklab/ansible-later.git
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128 lines
5.0 KiB
Python
128 lines
5.0 KiB
Python
# Copyright (c) 2017 Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = '''
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name: constructed
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plugin_type: inventory
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version_added: "2.4"
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short_description: Uses Jinja2 to construct vars and groups based on existing inventory.
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description:
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- Uses a YAML configuration file with a valid YAML or C(.config) extension to define var expressions and group conditionals
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- The Jinja2 conditionals that qualify a host for membership.
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- The JInja2 exprpessions are calculated and assigned to the variables
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- Only variables already available from previous inventories or the fact cache can be used for templating.
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- When I(strict) is False, failed expressions will be ignored (assumes vars were missing).
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options:
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plugin:
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description: token that ensures this is a source file for the 'constructed' plugin.
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required: True
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choices: ['constructed']
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extends_documentation_fragment:
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- constructed
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'''
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EXAMPLES = r'''
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# inventory.config file in YAML format
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plugin: constructed
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strict: False
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compose:
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var_sum: var1 + var2
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# this variable will only be set if I have a persistent fact cache enabled (and have non expired facts)
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# `strict: False` will skip this instead of producing an error if it is missing facts.
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server_type: "ansible_hostname | regex_replace ('(.{6})(.{2}).*', '\\2')"
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groups:
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# simple name matching
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webservers: inventory_hostname.startswith('web')
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# using ec2 'tags' (assumes aws inventory)
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development: "'devel' in (ec2_tags|list)"
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# using other host properties populated in inventory
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private_only: not (public_dns_name is defined or ip_address is defined)
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# complex group membership
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multi_group: (group_names|intersection(['alpha', 'beta', 'omega']))|length >= 2
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keyed_groups:
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# this creates a group per distro (distro_CentOS, distro_Debian) and assigns the hosts that have matching values to it,
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# using the default separator "_"
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- prefix: distro
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key: ansible_distribution
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# this creates a group per ec2 architecture and assign hosts to the matching ones (arch_x86_64, arch_sparc, etc)
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- prefix: arch
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key: ec2_architecture
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'''
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import os
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from ansible import constants as C
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from ansible.errors import AnsibleParserError
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from ansible.inventory.helpers import get_group_vars
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from ansible.plugins.cache import FactCache
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from ansible.plugins.inventory import BaseInventoryPlugin, Constructable
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from ansible.module_utils._text import to_native
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from ansible.utils.vars import combine_vars
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class InventoryModule(BaseInventoryPlugin, Constructable):
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""" constructs groups and vars using Jinja2 template expressions """
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NAME = 'constructed'
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def __init__(self):
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super(InventoryModule, self).__init__()
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self._cache = FactCache()
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def verify_file(self, path):
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valid = False
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if super(InventoryModule, self).verify_file(path):
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file_name, ext = os.path.splitext(path)
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if not ext or ext in ['.config'] + C.YAML_FILENAME_EXTENSIONS:
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valid = True
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return valid
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def parse(self, inventory, loader, path, cache=False):
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''' parses the inventory file '''
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super(InventoryModule, self).parse(inventory, loader, path, cache=cache)
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self._read_config_data(path)
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strict = self.get_option('strict')
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fact_cache = FactCache()
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try:
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# Go over hosts (less var copies)
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for host in inventory.hosts:
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# get available variables to templar
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hostvars = combine_vars(get_group_vars(inventory.hosts[host].get_groups()), inventory.hosts[host].get_vars())
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if host in fact_cache: # adds facts if cache is active
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hostvars = combine_vars(hostvars, fact_cache[host])
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# create composite vars
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self._set_composite_vars(self.get_option('compose'), hostvars, host, strict=strict)
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# refetch host vars in case new ones have been created above
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hostvars = combine_vars(get_group_vars(inventory.hosts[host].get_groups()), inventory.hosts[host].get_vars())
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if host in self._cache: # adds facts if cache is active
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hostvars = combine_vars(hostvars, self._cache[host])
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# constructed groups based on conditionals
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self._add_host_to_composed_groups(self.get_option('groups'), hostvars, host, strict=strict)
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# constructed groups based variable values
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self._add_host_to_keyed_groups(self.get_option('keyed_groups'), hostvars, host, strict=strict)
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except Exception as e:
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raise AnsibleParserError("failed to parse %s: %s " % (to_native(path), to_native(e)))
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