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673 lines
25 KiB
Python
673 lines
25 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 sys
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import re
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import stat
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import subprocess
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from ansible import constants as C
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from ansible.errors import *
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from ansible.inventory.ini import InventoryParser
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from ansible.inventory.script import InventoryScript
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from ansible.inventory.dir import InventoryDirectory
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from ansible.inventory.group import Group
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from ansible.inventory.host import Host
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from ansible.plugins import vars_loader
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from ansible.utils.path import is_executable
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from ansible.utils.vars import combine_vars
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class Inventory(object):
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"""
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Host inventory for ansible.
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"""
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__slots__ = [ 'host_list', 'groups', '_restriction', '_also_restriction', '_subset',
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'parser', '_vars_per_host', '_vars_per_group', '_hosts_cache', '_groups_list',
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'_pattern_cache', '_vault_password', '_vars_plugins', '_playbook_basedir']
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def __init__(self, loader, variable_manager, host_list=C.DEFAULT_HOST_LIST):
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# the host file file, or script path, or list of hosts
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# if a list, inventory data will NOT be loaded
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self.host_list = host_list
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self._loader = loader
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self._variable_manager = variable_manager
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# caching to avoid repeated calculations, particularly with
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# external inventory scripts.
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self._vars_per_host = {}
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self._vars_per_group = {}
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self._hosts_cache = {}
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self._groups_list = {}
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self._pattern_cache = {}
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# to be set by calling set_playbook_basedir by playbook code
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self._playbook_basedir = None
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# the inventory object holds a list of groups
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self.groups = []
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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._also_restriction = None
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self._subset = None
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if isinstance(host_list, basestring):
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if "," in host_list:
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host_list = host_list.split(",")
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host_list = [ h for h in host_list if h and h.strip() ]
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if host_list is None:
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self.parser = None
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elif isinstance(host_list, list):
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self.parser = None
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all = Group('all')
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self.groups = [ all ]
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ipv6_re = re.compile('\[([a-f:A-F0-9]*[%[0-z]+]?)\](?::(\d+))?')
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for x in host_list:
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m = ipv6_re.match(x)
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if m:
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all.add_host(Host(m.groups()[0], m.groups()[1]))
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else:
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if ":" in x:
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tokens = x.rsplit(":", 1)
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# if there is ':' in the address, then this is an ipv6
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if ':' in tokens[0]:
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all.add_host(Host(x))
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else:
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all.add_host(Host(tokens[0], tokens[1]))
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else:
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all.add_host(Host(x))
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elif os.path.exists(host_list):
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if os.path.isdir(host_list):
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# Ensure basedir is inside the directory
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self.host_list = os.path.join(self.host_list, "")
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self.parser = InventoryDirectory(loader=self._loader, filename=host_list)
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self.groups = self.parser.groups.values()
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else:
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# check to see if the specified file starts with a
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# shebang (#!/), so if an error is raised by the parser
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# class we can show a more apropos error
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shebang_present = False
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try:
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inv_file = open(host_list)
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first_line = inv_file.readlines()[0]
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inv_file.close()
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if first_line.startswith('#!'):
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shebang_present = True
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except:
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pass
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if is_executable(host_list):
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try:
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self.parser = InventoryScript(loader=self._loader, filename=host_list)
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self.groups = self.parser.groups.values()
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except:
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if not shebang_present:
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raise errors.AnsibleError("The file %s is marked as executable, but failed to execute correctly. " % host_list + \
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"If this is not supposed to be an executable script, correct this with `chmod -x %s`." % host_list)
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else:
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raise
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else:
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try:
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self.parser = InventoryParser(filename=host_list)
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self.groups = self.parser.groups.values()
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except:
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if shebang_present:
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raise errors.AnsibleError("The file %s looks like it should be an executable inventory script, but is not marked executable. " % host_list + \
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"Perhaps you want to correct this with `chmod +x %s`?" % host_list)
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else:
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raise
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vars_loader.add_directory(self.basedir(), with_subdir=True)
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else:
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raise errors.AnsibleError("Unable to find an inventory file, specify one with -i ?")
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self._vars_plugins = [ x for x in vars_loader.all(self) ]
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# FIXME: shouldn't be required, since the group/host vars file
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# management will be done in VariableManager
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# get group vars from group_vars/ files and vars plugins
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for group in self.groups:
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# FIXME: combine_vars
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group.vars = combine_vars(group.vars, self.get_group_variables(group.name))
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# get host vars from host_vars/ files and vars plugins
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for host in self.get_hosts():
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# FIXME: combine_vars
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host.vars = combine_vars(host.vars, self.get_host_variables(host.name))
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def _match(self, str, pattern_str):
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try:
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if pattern_str.startswith('~'):
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return re.search(pattern_str[1:], str)
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else:
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return fnmatch.fnmatch(str, pattern_str)
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except Exception, e:
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raise errors.AnsibleError('invalid host pattern: %s' % pattern_str)
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def _match_list(self, items, item_attr, pattern_str):
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results = []
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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, e:
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raise errors.AnsibleError('invalid host pattern: %s' % pattern_str)
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for item in items:
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if pattern.match(getattr(item, item_attr)):
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results.append(item)
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return results
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def get_hosts(self, pattern="all"):
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"""
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find all host names matching a pattern string, taking into account any inventory restrictions or
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applied subsets.
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"""
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# process patterns
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if isinstance(pattern, list):
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pattern = ';'.join(pattern)
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patterns = pattern.replace(";",":").split(":")
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hosts = self._get_hosts(patterns)
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# exclude hosts not in a subset, if defined
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if self._subset:
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subset = self._get_hosts(self._subset)
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hosts = [ h for h in hosts if h in subset ]
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# exclude hosts mentioned in any restriction (ex: failed hosts)
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if self._restriction is not None:
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hosts = [ h for h in hosts if h in self._restriction ]
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if self._also_restriction is not None:
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hosts = [ h for h in hosts if h in self._also_restriction ]
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return hosts
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def _get_hosts(self, patterns):
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"""
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finds hosts that match a list of patterns. Handles negative
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matches as well as intersection matches.
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"""
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# Host specifiers should be sorted to ensure consistent behavior
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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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patterns = pattern_regular + pattern_intersection + pattern_exclude
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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._hosts_cache:
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hosts.append(self.get_host(p))
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else:
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that = self.__get_hosts(p)
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if p.startswith("!"):
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hosts = [ h for h in hosts if h not in that ]
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elif p.startswith("&"):
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hosts = [ h for h in hosts if h in that ]
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else:
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to_append = [ h for h in that if h.name not in [ y.name for y in hosts ] ]
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hosts.extend(to_append)
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return hosts
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def __get_hosts(self, pattern):
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"""
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finds hosts that positively match a particular pattern. Does not
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take into account negative matches.
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"""
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if pattern in self._pattern_cache:
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return self._pattern_cache[pattern]
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(name, enumeration_details) = self._enumeration_info(pattern)
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hpat = self._hosts_in_unenumerated_pattern(name)
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result = self._apply_ranges(pattern, hpat)
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self._pattern_cache[pattern] = result
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return result
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def _enumeration_info(self, pattern):
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"""
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returns (pattern, limits) taking a regular pattern and finding out
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which parts of it correspond to start/stop offsets. limits is
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a tuple of (start, stop) or None
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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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# The regex used to match on the range, which can be [x] or [x-y].
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pattern_re = re.compile("^(.*)\[([-]?[0-9]+)(?:(?:-)([0-9]+))?\](.*)$")
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m = pattern_re.match(pattern)
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if m:
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(target, first, last, rest) = m.groups()
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first = int(first)
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if last:
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if first < 0:
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raise errors.AnsibleError("invalid range: negative indices cannot be used as the first item in a range")
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last = int(last)
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else:
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last = first
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return (target, (first, last))
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else:
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return (pattern, None)
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def _apply_ranges(self, pat, hosts):
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"""
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given a pattern like foo, that matches hosts, return all of hosts
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given a pattern like foo[0:5], where foo matches hosts, return the first 6 hosts
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"""
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# If there are no hosts to select from, just return the
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# empty set. This prevents trying to do selections on an empty set.
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# issue#6258
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if not hosts:
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return hosts
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(loose_pattern, limits) = self._enumeration_info(pat)
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if not limits:
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return hosts
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(left, right) = limits
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if left == '':
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left = 0
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if right == '':
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right = 0
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left=int(left)
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right=int(right)
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try:
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if left != right:
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return hosts[left:right]
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else:
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return [ hosts[left] ]
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except IndexError:
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raise errors.AnsibleError("no hosts matching the pattern '%s' were found" % pat)
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def _create_implicit_localhost(self, pattern):
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new_host = Host(pattern)
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new_host.set_variable("ansible_python_interpreter", sys.executable)
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new_host.set_variable("ansible_connection", "local")
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new_host.ipv4_address = '127.0.0.1'
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ungrouped = self.get_group("ungrouped")
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if ungrouped is None:
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self.add_group(Group('ungrouped'))
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ungrouped = self.get_group('ungrouped')
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self.get_group('all').add_child_group(ungrouped)
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ungrouped.add_host(new_host)
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return new_host
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def _hosts_in_unenumerated_pattern(self, pattern):
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""" Get all host names matching the pattern """
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results = []
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hosts = []
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hostnames = set()
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# ignore any negative checks here, this is handled elsewhere
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pattern = pattern.replace("!","").replace("&", "")
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def __append_host_to_results(host):
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if host not in results and host.name not in hostnames:
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hostnames.add(host.name)
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results.append(host)
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groups = self.get_groups()
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for group in groups:
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if pattern == 'all':
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for host in group.get_hosts():
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__append_host_to_results(host)
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else:
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if self._match(group.name, pattern):
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for host in group.get_hosts():
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__append_host_to_results(host)
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else:
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matching_hosts = self._match_list(group.get_hosts(), 'name', pattern)
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for host in matching_hosts:
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__append_host_to_results(host)
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if pattern in ["localhost", "127.0.0.1"] and len(results) == 0:
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new_host = self._create_implicit_localhost(pattern)
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results.append(new_host)
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return results
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def clear_pattern_cache(self):
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''' called exclusively by the add_host plugin to allow patterns to be recalculated '''
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self._pattern_cache = {}
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def groups_for_host(self, host):
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if host in self._hosts_cache:
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return self._hosts_cache[host].get_groups()
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else:
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return []
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def groups_list(self):
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if not self._groups_list:
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groups = {}
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for g in self.groups:
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groups[g.name] = [h.name for h in g.get_hosts()]
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ancestors = g.get_ancestors()
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for a in ancestors:
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if a.name not in groups:
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groups[a.name] = [h.name for h in a.get_hosts()]
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self._groups_list = groups
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return self._groups_list
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def get_groups(self):
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return self.groups
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def get_host(self, hostname):
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if hostname not in self._hosts_cache:
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self._hosts_cache[hostname] = self._get_host(hostname)
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return self._hosts_cache[hostname]
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def _get_host(self, hostname):
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if hostname in ['localhost','127.0.0.1']:
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for host in self.get_group('all').get_hosts():
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if host.name in ['localhost', '127.0.0.1']:
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return host
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return self._create_implicit_localhost(hostname)
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else:
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for group in self.groups:
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for host in group.get_hosts():
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if hostname == host.name:
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return host
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return None
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def get_group(self, groupname):
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for group in self.groups:
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if group.name == groupname:
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return group
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return None
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def get_group_variables(self, groupname, update_cached=False, vault_password=None):
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if groupname not in self._vars_per_group or update_cached:
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self._vars_per_group[groupname] = self._get_group_variables(groupname, vault_password=vault_password)
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return self._vars_per_group[groupname]
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def _get_group_variables(self, groupname, vault_password=None):
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group = self.get_group(groupname)
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if group is None:
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raise Exception("group not found: %s" % groupname)
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vars = {}
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# plugin.get_group_vars retrieves just vars for specific group
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vars_results = [ plugin.get_group_vars(group, vault_password=vault_password) for plugin in self._vars_plugins if hasattr(plugin, 'get_group_vars')]
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for updated in vars_results:
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if updated is not None:
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# FIXME: combine_vars
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vars = combine_vars(vars, updated)
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# Read group_vars/ files
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# FIXME: combine_vars
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vars = combine_vars(vars, self.get_group_vars(group))
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return vars
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def get_vars(self, hostname, update_cached=False, vault_password=None):
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host = self.get_host(hostname)
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if not host:
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raise Exception("host not found: %s" % hostname)
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return host.get_vars()
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def get_host_variables(self, hostname, update_cached=False, vault_password=None):
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if hostname not in self._vars_per_host or update_cached:
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self._vars_per_host[hostname] = self._get_host_variables(hostname, vault_password=vault_password)
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return self._vars_per_host[hostname]
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def _get_host_variables(self, hostname, vault_password=None):
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host = self.get_host(hostname)
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if host is None:
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raise errors.AnsibleError("host not found: %s" % hostname)
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vars = {}
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# plugin.run retrieves all vars (also from groups) for host
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vars_results = [ plugin.run(host, vault_password=vault_password) for plugin in self._vars_plugins if hasattr(plugin, 'run')]
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for updated in vars_results:
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if updated is not None:
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# FIXME: combine_vars
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vars = combine_vars(vars, updated)
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# plugin.get_host_vars retrieves just vars for specific host
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vars_results = [ plugin.get_host_vars(host, vault_password=vault_password) for plugin in self._vars_plugins if hasattr(plugin, 'get_host_vars')]
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for updated in vars_results:
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if updated is not None:
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# FIXME: combine_vars
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vars = combine_vars(vars, updated)
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# still need to check InventoryParser per host vars
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# which actually means InventoryScript per host,
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# which is not performant
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if self.parser is not None:
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# FIXME: combine_vars
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vars = combine_vars(vars, self.parser.get_host_variables(host))
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# Read host_vars/ files
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# FIXME: combine_vars
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vars = combine_vars(vars, self.get_host_vars(host))
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return vars
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def add_group(self, group):
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if group.name not in self.groups_list():
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self.groups.append(group)
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self._groups_list = None # invalidate internal cache
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else:
|
|
raise errors.AnsibleError("group already in inventory: %s" % group.name)
|
|
|
|
def list_hosts(self, pattern="all"):
|
|
|
|
""" return a list of hostnames for a pattern """
|
|
|
|
result = [ h for h in self.get_hosts(pattern) ]
|
|
if len(result) == 0 and pattern in ["localhost", "127.0.0.1"]:
|
|
result = [pattern]
|
|
return result
|
|
|
|
def list_groups(self):
|
|
return sorted([ g.name for g in self.groups ], key=lambda x: x)
|
|
|
|
def restrict_to_hosts(self, restriction):
|
|
"""
|
|
Restrict list operations to the hosts given in restriction. This is used
|
|
to exclude failed hosts in main playbook code, don't use this for other
|
|
reasons.
|
|
"""
|
|
if not isinstance(restriction, list):
|
|
restriction = [ restriction ]
|
|
self._restriction = restriction
|
|
|
|
def also_restrict_to(self, restriction):
|
|
"""
|
|
Works like restict_to but offers an additional restriction. Playbooks use this
|
|
to implement serial behavior.
|
|
"""
|
|
if not isinstance(restriction, list):
|
|
restriction = [ restriction ]
|
|
self._also_restriction = 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_pattern = subset_pattern.replace(',',':')
|
|
subset_pattern = subset_pattern.replace(";",":").split(":")
|
|
results = []
|
|
# allow Unix style @filename data
|
|
for x in subset_pattern:
|
|
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 lift_also_restriction(self):
|
|
""" Clears the also restriction """
|
|
self._also_restriction = None
|
|
|
|
def is_file(self):
|
|
""" did inventory come from a file? """
|
|
if not isinstance(self.host_list, basestring):
|
|
return False
|
|
return os.path.exists(self.host_list)
|
|
|
|
def basedir(self):
|
|
""" if inventory came from a file, what's the directory? """
|
|
if not self.is_file():
|
|
return None
|
|
dname = os.path.dirname(self.host_list)
|
|
if dname is None or dname == '' or dname == '.':
|
|
cwd = os.getcwd()
|
|
return os.path.abspath(cwd)
|
|
return os.path.abspath(dname)
|
|
|
|
def src(self):
|
|
""" if inventory came from a file, what's the directory and file name? """
|
|
if not self.is_file():
|
|
return None
|
|
return self.host_list
|
|
|
|
def playbook_basedir(self):
|
|
""" returns the directory of the current playbook """
|
|
return self._playbook_basedir
|
|
|
|
def set_playbook_basedir(self, dir):
|
|
"""
|
|
sets the base directory of the playbook so inventory can use it as a
|
|
basedir for host_ and group_vars, and other things.
|
|
"""
|
|
# Only update things if dir is a different playbook basedir
|
|
if dir != self._playbook_basedir:
|
|
self._playbook_basedir = dir
|
|
# get group vars from group_vars/ files
|
|
for group in self.groups:
|
|
# FIXME: combine_vars
|
|
group.vars = combine_vars(group.vars, self.get_group_vars(group, new_pb_basedir=True))
|
|
# get host vars from host_vars/ files
|
|
for host in self.get_hosts():
|
|
# FIXME: combine_vars
|
|
host.vars = combine_vars(host.vars, self.get_host_vars(host, new_pb_basedir=True))
|
|
# invalidate cache
|
|
self._vars_per_host = {}
|
|
self._vars_per_group = {}
|
|
|
|
def get_host_vars(self, host, new_pb_basedir=False):
|
|
""" Read host_vars/ files """
|
|
return self._get_hostgroup_vars(host=host, group=None, new_pb_basedir=new_pb_basedir)
|
|
|
|
def get_group_vars(self, group, new_pb_basedir=False):
|
|
""" Read group_vars/ files """
|
|
return self._get_hostgroup_vars(host=None, group=group, new_pb_basedir=new_pb_basedir)
|
|
|
|
def _get_hostgroup_vars(self, host=None, group=None, new_pb_basedir=False):
|
|
"""
|
|
Loads variables from group_vars/<groupname> and host_vars/<hostname> in directories parallel
|
|
to the inventory base directory or in the same directory as the playbook. Variables in the playbook
|
|
dir will win over the inventory dir if files are in both.
|
|
"""
|
|
|
|
results = {}
|
|
scan_pass = 0
|
|
_basedir = self.basedir()
|
|
|
|
# look in both the inventory base directory and the playbook base directory
|
|
# unless we do an update for a new playbook base dir
|
|
if not new_pb_basedir:
|
|
basedirs = [_basedir, self._playbook_basedir]
|
|
else:
|
|
basedirs = [self._playbook_basedir]
|
|
|
|
for basedir in basedirs:
|
|
|
|
# this can happen from particular API usages, particularly if not run
|
|
# from /usr/bin/ansible-playbook
|
|
if basedir is None:
|
|
continue
|
|
|
|
scan_pass = scan_pass + 1
|
|
|
|
# it's not an eror if the directory does not exist, keep moving
|
|
if not os.path.exists(basedir):
|
|
continue
|
|
|
|
# save work of second scan if the directories are the same
|
|
if _basedir == self._playbook_basedir and scan_pass != 1:
|
|
continue
|
|
|
|
# FIXME: these should go to VariableManager
|
|
if group and host is None:
|
|
# load vars in dir/group_vars/name_of_group
|
|
base_path = os.path.join(basedir, "group_vars/%s" % group.name)
|
|
self._variable_manager.add_group_vars_file(base_path, self._loader)
|
|
elif host and group is None:
|
|
# same for hostvars in dir/host_vars/name_of_host
|
|
base_path = os.path.join(basedir, "host_vars/%s" % host.name)
|
|
self._variable_manager.add_host_vars_file(base_path, self._loader)
|
|
|
|
# all done, results is a dictionary of variables for this particular host.
|
|
return results
|
|
|