50d75f8d6d
Since c8f2483d, ini.py expects to always be passed in a pre-created list
of groups, and can no longer deal sensibly with an empty list; this just
makes that expectation clear.
361 lines
14 KiB
Python
361 lines
14 KiB
Python
# Copyright 2015 Abhijit Menon-Sen <ams@2ndQuadrant.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 ast
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import re
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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.host import Host
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from ansible.inventory.group import Group
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from ansible.inventory.expand_hosts import detect_range
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from ansible.inventory.expand_hosts import expand_hostname_range
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from ansible.parsing.utils.addresses import parse_address
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from ansible.utils.shlex import shlex_split
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from ansible.utils.unicode import to_unicode
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class InventoryParser(object):
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"""
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Takes an INI-format inventory file and builds a list of groups and subgroups
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with their associated hosts and variable settings.
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"""
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def __init__(self, loader, groups, filename=C.DEFAULT_HOST_LIST):
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self._loader = loader
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self.filename = filename
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# Start with an empty host list and whatever groups we're passed in
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# (which should include the default 'all' and 'ungrouped' groups).
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self.hosts = {}
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self.patterns = {}
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self.groups = groups
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# Read in the hosts, groups, and variables defined in the
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# inventory file.
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if loader:
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(data, private) = loader._get_file_contents(filename)
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else:
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with open(filename) as fh:
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data = to_unicode(fh.read())
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data = data.split('\n')
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self._parse(data)
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def _raise_error(self, message):
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raise AnsibleError("%s:%d: " % (self.filename, self.lineno) + message)
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def _parse(self, lines):
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'''
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Populates self.groups from the given array of lines. Raises an error on
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any parse failure.
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'''
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self._compile_patterns()
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# We behave as though the first line of the inventory is '[ungrouped]',
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# and begin to look for host definitions. We make a single pass through
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# each line of the inventory, building up self.groups and adding hosts,
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# subgroups, and setting variables as we go.
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pending_declarations = {}
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groupname = 'ungrouped'
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state = 'hosts'
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self.lineno = 0
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for line in lines:
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self.lineno += 1
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line = line.strip()
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# Skip empty lines and comments
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if line == '' or line.startswith(";") or line.startswith("#"):
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continue
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# Is this a [section] header? That tells us what group we're parsing
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# definitions for, and what kind of definitions to expect.
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m = self.patterns['section'].match(line)
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if m:
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(groupname, state) = m.groups()
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state = state or 'hosts'
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if state not in ['hosts', 'children', 'vars']:
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title = ":".join(m.groups())
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self._raise_error("Section [%s] has unknown type: %s" % (title, state))
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# If we haven't seen this group before, we add a new Group.
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#
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# Either [groupname] or [groupname:children] is sufficient to
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# declare a group, but [groupname:vars] is allowed only if the
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# group is declared elsewhere (not necessarily earlier). We add
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# the group anyway, but make a note in pending_declarations to
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# check at the end.
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if groupname not in self.groups:
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self.groups[groupname] = Group(name=groupname)
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if state == 'vars':
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pending_declarations[groupname] = dict(line=self.lineno, state=state, name=groupname)
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# When we see a declaration that we've been waiting for, we can
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# delete the note.
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if groupname in pending_declarations and state != 'vars':
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del pending_declarations[groupname]
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continue
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# It's not a section, so the current state tells us what kind of
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# definition it must be. The individual parsers will raise an
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# error if we feed them something they can't digest.
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# [groupname] contains host definitions that must be added to
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# the current group.
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if state == 'hosts':
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hosts = self._parse_host_definition(line)
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for h in hosts:
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self.groups[groupname].add_host(h)
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# [groupname:vars] contains variable definitions that must be
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# applied to the current group.
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elif state == 'vars':
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(k, v) = self._parse_variable_definition(line)
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self.groups[groupname].set_variable(k, v)
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# [groupname:children] contains subgroup names that must be
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# added as children of the current group. The subgroup names
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# must themselves be declared as groups, but as before, they
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# may only be declared later.
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elif state == 'children':
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child = self._parse_group_name(line)
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if child not in self.groups:
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self.groups[child] = Group(name=child)
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pending_declarations[child] = dict(line=self.lineno, state=state, name=child, parent=groupname)
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self.groups[groupname].add_child_group(self.groups[child])
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# Note: there's no reason why we couldn't accept variable
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# definitions here, and set them on the named child group.
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# This is a fencepost. It can happen only if the state checker
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# accepts a state that isn't handled above.
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else:
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self._raise_error("Entered unhandled state: %s" % (state))
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# Any entries in pending_declarations not removed by a group declaration
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# above mean that there was an unresolved forward reference. We report
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# only the first such error here.
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for g in pending_declarations:
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decl = pending_declarations[g]
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if decl['state'] == 'vars':
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raise AnsibleError("%s:%d: Section [%s:vars] not valid for undefined group: %s" % (self.filename, decl['line'], decl['name'], decl['name']))
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elif decl['state'] == 'children':
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raise AnsibleError("%s:%d: Section [%s:children] includes undefined group: %s" % (self.filename, decl['line'], decl['parent'], decl['name']))
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# Finally, add all top-level groups as children of 'all'.
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# We exclude ungrouped here because it was already added as a child of
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# 'all' at the time it was created.
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for group in self.groups.values():
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if group.depth == 0 and group.name not in ('all', 'ungrouped'):
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self.groups['all'].add_child_group(group)
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def _parse_group_name(self, line):
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'''
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Takes a single line and tries to parse it as a group name. Returns the
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group name if successful, or raises an error.
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'''
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m = self.patterns['groupname'].match(line)
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if m:
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return m.group(1)
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self._raise_error("Expected group name, got: %s" % (line))
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def _parse_variable_definition(self, line):
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'''
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Takes a string and tries to parse it as a variable definition. Returns
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the key and value if successful, or raises an error.
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'''
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# TODO: We parse variable assignments as a key (anything to the left of
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# an '='"), an '=', and a value (anything left) and leave the value to
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# _parse_value to sort out. We should be more systematic here about
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# defining what is acceptable, how quotes work, and so on.
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if '=' in line:
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(k, v) = [e.strip() for e in line.split("=", 1)]
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return (k, self._parse_value(v))
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self._raise_error("Expected key=value, got: %s" % (line))
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def _parse_host_definition(self, line):
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'''
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Takes a single line and tries to parse it as a host definition. Returns
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a list of Hosts if successful, or raises an error.
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'''
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# A host definition comprises (1) a non-whitespace hostname or range,
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# optionally followed by (2) a series of key="some value" assignments.
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# We ignore any trailing whitespace and/or comments. For example, here
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# are a series of host definitions in a group:
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#
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# [groupname]
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# alpha
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# beta:2345 user=admin # we'll tell shlex
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# gamma sudo=True user=root # to ignore comments
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try:
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tokens = shlex_split(line, comments=True)
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except ValueError as e:
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self._raise_error("Error parsing host definition '%s': %s" % (varstring, e))
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(hostnames, port) = self._expand_hostpattern(tokens[0])
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hosts = self._Hosts(hostnames, port)
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# Try to process anything remaining as a series of key=value pairs.
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variables = {}
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for t in tokens[1:]:
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if '=' not in t:
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self._raise_error("Expected key=value host variable assignment, got: %s" % (t))
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(k, v) = t.split('=', 1)
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variables[k] = self._parse_value(v)
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# Apply any variable settings found to every host.
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for h in hosts:
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for k in variables:
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h.set_variable(k, variables[k])
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if k in ['ansible_host', 'ansible_ssh_host']:
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h.address = variables[k]
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return hosts
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def _expand_hostpattern(self, hostpattern):
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'''
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Takes a single host pattern and returns a list of hostnames and an
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optional port number that applies to all of them.
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'''
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# Can the given hostpattern be parsed as a host with an optional port
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# specification?
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(pattern, port) = parse_address(hostpattern, allow_ranges=True)
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if not pattern:
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self._raise_error("Can't parse '%s' as host[:port]" % hostpattern)
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# Once we have separated the pattern, we expand it into list of one or
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# more hostnames, depending on whether it contains any [x:y] ranges.
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if detect_range(pattern):
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hostnames = expand_hostname_range(pattern)
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else:
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hostnames = [pattern]
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return (hostnames, port)
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def _Hosts(self, hostnames, port):
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'''
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Takes a list of hostnames and a port (which may be None) and returns a
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list of Hosts (without recreating anything in self.hosts).
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'''
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hosts = []
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# Note that we decide whether or not to create a Host based solely on
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# the (non-)existence of its hostname in self.hosts. This means that one
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# cannot add both "foo:22" and "foo:23" to the inventory. This behaviour
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# is preserved for now, but this may be an easy FIXME.
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for hn in hostnames:
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if hn not in self.hosts:
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self.hosts[hn] = Host(name=hn, port=port)
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hosts.append(self.hosts[hn])
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return hosts
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@staticmethod
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def _parse_value(v):
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'''
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Attempt to transform the string value from an ini file into a basic python object
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(int, dict, list, unicode string, etc).
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'''
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if "#" not in v:
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try:
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v = ast.literal_eval(v)
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# Using explicit exceptions.
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# Likely a string that literal_eval does not like. We wil then just set it.
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except ValueError:
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# For some reason this was thought to be malformed.
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pass
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except SyntaxError:
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# Is this a hash with an equals at the end?
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pass
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return to_unicode(v, nonstring='passthru', errors='strict')
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def get_host_variables(self, host):
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return {}
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def _compile_patterns(self):
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'''
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Compiles the regular expressions required to parse the inventory and
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stores them in self.patterns.
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'''
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# Section names are square-bracketed expressions at the beginning of a
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# line, comprising (1) a group name optionally followed by (2) a tag
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# that specifies the contents of the section. We ignore any trailing
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# whitespace and/or comments. For example:
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#
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# [groupname]
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# [somegroup:vars]
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# [naughty:children] # only get coal in their stockings
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self.patterns['section'] = re.compile(
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r'''^\[
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([^:\]\s]+) # group name (see groupname below)
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(?::(\w+))? # optional : and tag name
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\]
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\s* # ignore trailing whitespace
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(?:\#.*)? # and/or a comment till the
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$ # end of the line
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''', re.X
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)
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# FIXME: What are the real restrictions on group names, or rather, what
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# should they be? At the moment, they must be non-empty sequences of non
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# whitespace characters excluding ':' and ']', but we should define more
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# precise rules in order to support better diagnostics.
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self.patterns['groupname'] = re.compile(
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r'''^
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([^:\]\s]+)
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\s* # ignore trailing whitespace
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(?:\#.*)? # and/or a comment till the
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$ # end of the line
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''', re.X
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)
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