610 lines
23 KiB
Python
610 lines
23 KiB
Python
# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
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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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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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import fnmatch
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import os
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import re
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import itertools
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from ansible import constants as C
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from ansible.errors import AnsibleError, AnsibleOptionsError, AnsibleParserError
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from ansible.inventory.data import InventoryData
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from ansible.module_utils.six import string_types
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from ansible.module_utils._text import to_bytes, to_text
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from ansible.parsing.utils.addresses import parse_address
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from ansible.plugins.loader import inventory_loader
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from ansible.utils.path import unfrackpath
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try:
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from __main__ import display
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except ImportError:
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from ansible.utils.display import Display
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display = Display()
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IGNORED_ALWAYS = [br"^\.", b"^host_vars$", b"^group_vars$", b"^vars_plugins$"]
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IGNORED_PATTERNS = [to_bytes(x) for x in C.INVENTORY_IGNORE_PATTERNS]
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IGNORED_EXTS = [b'%s$' % to_bytes(re.escape(x)) for x in C.INVENTORY_IGNORE_EXTS]
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IGNORED = re.compile(b'|'.join(IGNORED_ALWAYS + IGNORED_PATTERNS + IGNORED_EXTS))
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def order_patterns(patterns):
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''' takes a list of patterns and reorders them by modifier to apply them consistently '''
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# FIXME: this goes away if we apply patterns incrementally or by groups
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pattern_regular = []
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pattern_intersection = []
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pattern_exclude = []
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for p in patterns:
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if p.startswith("!"):
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pattern_exclude.append(p)
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elif p.startswith("&"):
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pattern_intersection.append(p)
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elif p:
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pattern_regular.append(p)
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# if no regular pattern was given, hence only exclude and/or intersection
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# make that magically work
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if pattern_regular == []:
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pattern_regular = ['all']
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# when applying the host selectors, run those without the "&" or "!"
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# first, then the &s, then the !s.
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return pattern_regular + pattern_intersection + pattern_exclude
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def split_host_pattern(pattern):
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"""
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Takes a string containing host patterns separated by commas (or a list
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thereof) and returns a list of single patterns (which may not contain
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commas). Whitespace is ignored.
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Also accepts ':' as a separator for backwards compatibility, but it is
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not recommended due to the conflict with IPv6 addresses and host ranges.
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Example: 'a,b[1], c[2:3] , d' -> ['a', 'b[1]', 'c[2:3]', 'd']
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"""
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if isinstance(pattern, list):
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return list(itertools.chain(*map(split_host_pattern, pattern)))
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elif not isinstance(pattern, string_types):
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pattern = to_text(pattern, errors='surrogate_or_strict')
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# If it's got commas in it, we'll treat it as a straightforward
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# comma-separated list of patterns.
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if u',' in pattern:
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patterns = pattern.split(u',')
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# If it doesn't, it could still be a single pattern. This accounts for
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# non-separator uses of colons: IPv6 addresses and [x:y] host ranges.
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else:
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try:
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(base, port) = parse_address(pattern, allow_ranges=True)
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patterns = [pattern]
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except Exception:
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# The only other case we accept is a ':'-separated list of patterns.
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# This mishandles IPv6 addresses, and is retained only for backwards
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# compatibility.
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patterns = re.findall(
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to_text(r'''(?: # We want to match something comprising:
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[^\s:\[\]] # (anything other than whitespace or ':[]'
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| # ...or...
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\[[^\]]*\] # a single complete bracketed expression)
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)+ # occurring once or more
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'''), pattern, re.X
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)
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return [p.strip() for p in patterns]
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class InventoryManager(object):
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''' Creates and manages inventory '''
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def __init__(self, loader, sources=None):
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# base objects
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self._loader = loader
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self._inventory = InventoryData()
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# a list of host(names) to contain current inquiries to
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self._restriction = None
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self._subset = None
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# caches
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self._hosts_patterns_cache = {} # resolved full patterns
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self._pattern_cache = {} # resolved individual patterns
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self._inventory_plugins = [] # for generating inventory
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# the inventory dirs, files, script paths or lists of hosts
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if sources is None:
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self._sources = []
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elif isinstance(sources, string_types):
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self._sources = [sources]
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else:
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self._sources = sources
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# get to work!
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self.parse_sources(cache=True)
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@property
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def localhost(self):
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return self._inventory.localhost
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@property
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def groups(self):
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return self._inventory.groups
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@property
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def hosts(self):
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return self._inventory.hosts
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def get_vars(self, *args, **kwargs):
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return self._inventory.get_vars(args, kwargs)
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def add_host(self, host, group=None, port=None):
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return self._inventory.add_host(host, group, port)
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def add_group(self, group):
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return self._inventory.add_group(group)
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def get_groups_dict(self):
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return self._inventory.get_groups_dict()
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def reconcile_inventory(self):
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self.clear_caches()
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return self._inventory.reconcile_inventory()
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def get_host(self, hostname):
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return self._inventory.get_host(hostname)
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def _setup_inventory_plugins(self):
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''' sets up loaded inventory plugins for usage '''
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display.vvvv('setting up inventory plugins')
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for name in C.INVENTORY_ENABLED:
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plugin = inventory_loader.get(name)
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if plugin:
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self._inventory_plugins.append(plugin)
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else:
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display.warning('Failed to load inventory plugin, skipping %s' % name)
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if not self._inventory_plugins:
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raise AnsibleError("No inventory plugins available to generate inventory, make sure you have at least one whitelisted.")
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def parse_sources(self, cache=False):
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''' iterate over inventory sources and parse each one to populate it'''
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self._setup_inventory_plugins()
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parsed = False
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# allow for multiple inventory parsing
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for source in self._sources:
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if source:
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if ',' not in source:
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source = unfrackpath(source, follow=False)
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parse = self.parse_source(source, cache=cache)
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if parse and not parsed:
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parsed = True
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if parsed:
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# do post processing
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self._inventory.reconcile_inventory()
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else:
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if C.INVENTORY_UNPARSED_IS_FAILED:
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raise AnsibleError("No inventory was parsed, please check your configuration and options.")
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else:
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display.warning("No inventory was parsed, only implicit localhost is available")
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self._inventory_plugins = []
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def parse_source(self, source, cache=False):
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''' Generate or update inventory for the source provided '''
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parsed = False
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display.debug(u'Examining possible inventory source: %s' % source)
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# use binary for path functions
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b_source = to_bytes(source)
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# process directories as a collection of inventories
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if os.path.isdir(b_source):
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display.debug(u'Searching for inventory files in directory: %s' % source)
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for i in sorted(os.listdir(b_source)):
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display.debug(u'Considering %s' % i)
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# Skip hidden files and stuff we explicitly ignore
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if IGNORED.search(i):
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continue
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# recursively deal with directory entries
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fullpath = to_text(os.path.join(b_source, i), errors='surrogate_or_strict')
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parsed_this_one = self.parse_source(fullpath, cache=cache)
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display.debug(u'parsed %s as %s' % (fullpath, parsed_this_one))
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if not parsed:
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parsed = parsed_this_one
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else:
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# left with strings or files, let plugins figure it out
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# set so new hosts can use for inventory_file/dir vasr
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self._inventory.current_source = source
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# get inventory plugins if needed, there should always be at least one generator
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if not self._inventory_plugins:
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self._setup_inventory_plugins()
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# try source with each plugin
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failures = []
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for plugin in self._inventory_plugins:
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plugin_name = to_text(getattr(plugin, '_load_name', getattr(plugin, '_original_path', '')))
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display.debug(u'Attempting to use plugin %s (%s)' % (plugin_name, plugin._original_path))
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# initialize and figure out if plugin wants to attempt parsing this file
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try:
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plugin_wants = bool(plugin.verify_file(source))
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except Exception:
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plugin_wants = False
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if plugin_wants:
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try:
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# in case plugin fails 1/2 way we dont want partial inventory
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plugin.parse(self._inventory, self._loader, source, cache=cache)
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parsed = True
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display.vvv('Parsed %s inventory source with %s plugin' % (source, plugin_name))
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break
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except AnsibleParserError as e:
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display.debug('%s was not parsable by %s' % (source, plugin_name))
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failures.append({'src': source, 'plugin': plugin_name, 'exc': e})
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except Exception as e:
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display.debug('%s failed to parse %s' % (plugin_name, source))
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failures.append({'src': source, 'plugin': plugin_name, 'exc': AnsibleError(e)})
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else:
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display.v('%s did not meet %s requirements, check plugin documentation if this is unexpected' % (source, plugin_name))
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else:
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if not parsed and failures:
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# only if no plugin processed files should we show errors.
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for fail in failures:
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display.warning(u'\n* Failed to parse %s with %s plugin: %s' % (to_text(fail['src']), fail['plugin'], to_text(fail['exc'])))
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if hasattr(fail['exc'], 'tb'):
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display.vvv(to_text(fail['exc'].tb))
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if C.INVENTORY_ANY_UNPARSED_IS_FAILED:
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raise AnsibleError(u'Completely failed to parse inventory source %s' % (source))
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if not parsed:
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display.warning("Unable to parse %s as an inventory source" % source)
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# clear up, jic
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self._inventory.current_source = None
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return parsed
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def clear_caches(self):
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''' clear all caches '''
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self._hosts_patterns_cache = {}
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self._pattern_cache = {}
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# FIXME: flush inventory cache
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def refresh_inventory(self):
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''' recalculate inventory '''
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self.clear_caches()
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self._inventory = InventoryData()
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self.parse_sources(cache=False)
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def _match_list(self, items, pattern_str):
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# compile patterns
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try:
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if not pattern_str.startswith('~'):
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pattern = re.compile(fnmatch.translate(pattern_str))
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else:
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pattern = re.compile(pattern_str[1:])
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except Exception:
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raise AnsibleError('Invalid host list pattern: %s' % pattern_str)
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# apply patterns
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results = []
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for item in items:
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if pattern.match(item):
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results.append(item)
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return results
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def get_hosts(self, pattern="all", ignore_limits=False, ignore_restrictions=False, order=None):
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"""
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Takes a pattern or list of patterns and returns a list of matching
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inventory host names, taking into account any active restrictions
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or applied subsets
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"""
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hosts = []
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# Check if pattern already computed
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if isinstance(pattern, list):
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pattern_hash = u":".join(pattern)
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else:
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pattern_hash = pattern
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if pattern_hash:
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if not ignore_limits and self._subset:
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pattern_hash += u":%s" % to_text(self._subset, errors='surrogate_or_strict')
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if not ignore_restrictions and self._restriction:
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pattern_hash += u":%s" % to_text(self._restriction, errors='surrogate_or_strict')
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if pattern_hash not in self._hosts_patterns_cache:
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patterns = split_host_pattern(pattern)
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hosts = self._evaluate_patterns(patterns)
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# mainly useful for hostvars[host] access
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if not ignore_limits and self._subset:
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# exclude hosts not in a subset, if defined
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subset = self._evaluate_patterns(self._subset)
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hosts = [h for h in hosts if h in subset]
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if not ignore_restrictions and self._restriction:
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# exclude hosts mentioned in any restriction (ex: failed hosts)
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hosts = [h for h in hosts if h.name in self._restriction]
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seen = set()
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self._hosts_patterns_cache[pattern_hash] = [x for x in hosts if x not in seen and not seen.add(x)]
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# sort hosts list if needed (should only happen when called from strategy)
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if order in ['sorted', 'reverse_sorted']:
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from operator import attrgetter
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hosts = sorted(self._hosts_patterns_cache[pattern_hash][:], key=attrgetter('name'), reverse=(order == 'reverse_sorted'))
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elif order == 'reverse_inventory':
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hosts = sorted(self._hosts_patterns_cache[pattern_hash][:], reverse=True)
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else:
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hosts = self._hosts_patterns_cache[pattern_hash][:]
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if order == 'shuffle':
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from random import shuffle
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shuffle(hosts)
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elif order not in [None, 'inventory']:
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raise AnsibleOptionsError("Invalid 'order' specified for inventory hosts: %s" % order)
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return hosts
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def _evaluate_patterns(self, patterns):
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"""
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Takes a list of patterns and returns a list of matching host names,
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taking into account any negative and intersection patterns.
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"""
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patterns = order_patterns(patterns)
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hosts = []
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for p in patterns:
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# avoid resolving a pattern that is a plain host
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if p in self._inventory.hosts:
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hosts.append(self._inventory.get_host(p))
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else:
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that = self._match_one_pattern(p)
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if p.startswith("!"):
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hosts = [h for h in hosts if h not in frozenset(that)]
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elif p.startswith("&"):
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hosts = [h for h in hosts if h in frozenset(that)]
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else:
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hosts.extend([h for h in that if h.name not in frozenset([y.name for y in hosts])])
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return hosts
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def _match_one_pattern(self, pattern):
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"""
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Takes a single pattern and returns a list of matching host names.
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Ignores intersection (&) and exclusion (!) specifiers.
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The pattern may be:
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1. A regex starting with ~, e.g. '~[abc]*'
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2. A shell glob pattern with ?/*/[chars]/[!chars], e.g. 'foo*'
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3. An ordinary word that matches itself only, e.g. 'foo'
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The pattern is matched using the following rules:
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1. If it's 'all', it matches all hosts in all groups.
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2. Otherwise, for each known group name:
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(a) if it matches the group name, the results include all hosts
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in the group or any of its children.
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(b) otherwise, if it matches any hosts in the group, the results
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include the matching hosts.
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This means that 'foo*' may match one or more groups (thus including all
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hosts therein) but also hosts in other groups.
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The built-in groups 'all' and 'ungrouped' are special. No pattern can
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match these group names (though 'all' behaves as though it matches, as
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described above). The word 'ungrouped' can match a host of that name,
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and patterns like 'ungr*' and 'al*' can match either hosts or groups
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other than all and ungrouped.
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If the pattern matches one or more group names according to these rules,
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it may have an optional range suffix to select a subset of the results.
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This is allowed only if the pattern is not a regex, i.e. '~foo[1]' does
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not work (the [1] is interpreted as part of the regex), but 'foo*[1]'
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would work if 'foo*' matched the name of one or more groups.
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Duplicate matches are always eliminated from the results.
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"""
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if pattern.startswith("&") or pattern.startswith("!"):
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pattern = pattern[1:]
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if pattern not in self._pattern_cache:
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(expr, slice) = self._split_subscript(pattern)
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hosts = self._enumerate_matches(expr)
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try:
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hosts = self._apply_subscript(hosts, slice)
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except IndexError:
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raise AnsibleError("No hosts matched the subscripted pattern '%s'" % pattern)
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self._pattern_cache[pattern] = hosts
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return self._pattern_cache[pattern]
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def _split_subscript(self, pattern):
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"""
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Takes a pattern, checks if it has a subscript, and returns the pattern
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without the subscript and a (start,end) tuple representing the given
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subscript (or None if there is no subscript).
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Validates that the subscript is in the right syntax, but doesn't make
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sure the actual indices make sense in context.
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"""
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# Do not parse regexes for enumeration info
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if pattern.startswith('~'):
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return (pattern, None)
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# We want a pattern followed by an integer or range subscript.
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# (We can't be more restrictive about the expression because the
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# fnmatch semantics permit [\[:\]] to occur.)
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pattern_with_subscript = re.compile(
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r'''^
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(.+) # A pattern expression ending with...
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\[(?: # A [subscript] expression comprising:
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(-?[0-9]+)| # A single positive or negative number
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([0-9]+)([:-]) # Or an x:y or x: range.
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([0-9]*)
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)\]
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$
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''', re.X
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)
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subscript = None
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m = pattern_with_subscript.match(pattern)
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if m:
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(pattern, idx, start, sep, end) = m.groups()
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if idx:
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subscript = (int(idx), None)
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else:
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if not end:
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end = -1
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subscript = (int(start), int(end))
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if sep == '-':
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display.warning("Use [x:y] inclusive subscripts instead of [x-y] which has been removed")
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return (pattern, subscript)
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def _apply_subscript(self, hosts, subscript):
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"""
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Takes a list of hosts and a (start,end) tuple and returns the subset of
|
|
hosts based on the subscript (which may be None to return all hosts).
|
|
"""
|
|
|
|
if not hosts or not subscript:
|
|
return hosts
|
|
|
|
(start, end) = subscript
|
|
|
|
if end:
|
|
if end == -1:
|
|
end = len(hosts) - 1
|
|
return hosts[start:end + 1]
|
|
else:
|
|
return [hosts[start]]
|
|
|
|
def _enumerate_matches(self, pattern):
|
|
"""
|
|
Returns a list of host names matching the given pattern according to the
|
|
rules explained above in _match_one_pattern.
|
|
"""
|
|
|
|
results = []
|
|
# check if pattern matches group
|
|
matching_groups = self._match_list(self._inventory.groups, pattern)
|
|
if matching_groups:
|
|
for groupname in matching_groups:
|
|
results.extend(self._inventory.groups[groupname].get_hosts())
|
|
|
|
# check hosts if no groups matched or it is a regex/glob pattern
|
|
if not matching_groups or pattern.startswith('~') or any(special in pattern for special in ('.', '?', '*', '[')):
|
|
# pattern might match host
|
|
matching_hosts = self._match_list(self._inventory.hosts, pattern)
|
|
if matching_hosts:
|
|
for hostname in matching_hosts:
|
|
results.append(self._inventory.hosts[hostname])
|
|
|
|
if not results and pattern in C.LOCALHOST:
|
|
# get_host autocreates implicit when needed
|
|
implicit = self._inventory.get_host(pattern)
|
|
if implicit:
|
|
results.append(implicit)
|
|
|
|
# Display warning if specified host pattern did not match any groups or hosts
|
|
if not results and not matching_groups and pattern != 'all':
|
|
display.warning("Could not match supplied host pattern, ignoring: %s" % pattern)
|
|
|
|
return results
|
|
|
|
def list_hosts(self, pattern="all"):
|
|
""" return a list of hostnames for a pattern """
|
|
# FIXME: cache?
|
|
result = [h for h in self.get_hosts(pattern)]
|
|
|
|
# allow implicit localhost if pattern matches and no other results
|
|
if len(result) == 0 and pattern in C.LOCALHOST:
|
|
result = [pattern]
|
|
|
|
return result
|
|
|
|
def list_groups(self):
|
|
# FIXME: cache?
|
|
return sorted(self._inventory.groups.keys(), key=lambda x: x)
|
|
|
|
def restrict_to_hosts(self, restriction):
|
|
"""
|
|
Restrict list operations to the hosts given in restriction. This is used
|
|
to batch serial operations in main playbook code, don't use this for other
|
|
reasons.
|
|
"""
|
|
if restriction is None:
|
|
return
|
|
elif not isinstance(restriction, list):
|
|
restriction = [restriction]
|
|
self._restriction = [h.name for h in restriction]
|
|
|
|
def subset(self, subset_pattern):
|
|
"""
|
|
Limits inventory results to a subset of inventory that matches a given
|
|
pattern, such as to select a given geographic of numeric slice amongst
|
|
a previous 'hosts' selection that only select roles, or vice versa.
|
|
Corresponds to --limit parameter to ansible-playbook
|
|
"""
|
|
if subset_pattern is None:
|
|
self._subset = None
|
|
else:
|
|
subset_patterns = split_host_pattern(subset_pattern)
|
|
results = []
|
|
# allow Unix style @filename data
|
|
for x in subset_patterns:
|
|
if x.startswith("@"):
|
|
fd = open(x[1:])
|
|
results.extend(fd.read().split("\n"))
|
|
fd.close()
|
|
else:
|
|
results.append(x)
|
|
self._subset = results
|
|
|
|
def remove_restriction(self):
|
|
""" Do not restrict list operations """
|
|
self._restriction = None
|
|
|
|
def clear_pattern_cache(self):
|
|
self._pattern_cache = {}
|