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# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import ast
from json import dumps
from collections import MutableMapping
from ansible.compat.six import iteritems, string_types
from ansible import constants as C
from ansible.errors import AnsibleError
from ansible.parsing.splitter import parse_kv
from ansible.utils.unicode import to_unicode, to_str
def _validate_mutable_mappings(a, b):
"""
Internal convenience function to ensure arguments are MutableMappings
This checks that all arguments are MutableMappings or raises an error
:raises AnsibleError: if one of the arguments is not a MutableMapping
"""
# If this becomes generally needed, change the signature to operate on
# a variable number of arguments instead.
if not (isinstance(a, MutableMapping) and isinstance(b, MutableMapping)):
myvars = []
for x in [a, b]:
try:
myvars.append(dumps(x))
except:
myvars.append(to_str(x))
raise AnsibleError("failed to combine variables, expected dicts but got a '{0}' and a '{1}': \n{2}\n{3}".format(
a.__class__.__name__, b.__class__.__name__, myvars[0], myvars[1])
)
def combine_vars(a, b):
"""
Return a copy of dictionaries of variables based on configured hash behavior
"""
if C.DEFAULT_HASH_BEHAVIOUR == "merge":
return merge_hash(a, b)
else:
# HASH_BEHAVIOUR == 'replace'
_validate_mutable_mappings(a, b)
result = a.copy()
result.update(b)
return result
def merge_hash(a, b):
"""
Recursively merges hash b into a so that keys from b take precedence over keys from a
"""
_validate_mutable_mappings(a, b)
# if a is empty or equal to b, return b
if a == {} or a == b:
return b.copy()
# if b is empty the below unfolds quickly
result = a.copy()
# next, iterate over b keys and values
for k, v in iteritems(b):
# if there's already such key in a
# and that key contains a MutableMapping
if k in result and isinstance(result[k], MutableMapping) and isinstance(v, MutableMapping):
# merge those dicts recursively
result[k] = merge_hash(result[k], v)
else:
# otherwise, just copy the value from b to a
result[k] = v
return result
def load_extra_vars(loader, options):
extra_vars = {}
for extra_vars_opt in options.extra_vars:
extra_vars_opt = to_unicode(extra_vars_opt, errors='strict')
if extra_vars_opt.startswith(u"@"):
# Argument is a YAML file (JSON is a subset of YAML)
data = loader.load_from_file(extra_vars_opt[1:])
elif extra_vars_opt and extra_vars_opt[0] in u'[{':
# Arguments as YAML
data = loader.load(extra_vars_opt)
else:
# Arguments as Key-value
data = parse_kv(extra_vars_opt)
extra_vars = combine_vars(extra_vars, data)
return extra_vars
def load_options_vars(options):
options_vars = {}
# For now only return check mode, but we can easily return more
# options if we need variables for them
options_vars['ansible_check_mode'] = options.check
return options_vars
def isidentifier(ident):
"""
Determines, if string is valid Python identifier using the ast module.
Orignally posted at: http://stackoverflow.com/a/29586366
"""
if not isinstance(ident, string_types):
return False
try:
root = ast.parse(ident)
except SyntaxError:
return False
if not isinstance(root, ast.Module):
return False
if len(root.body) != 1:
return False
if not isinstance(root.body[0], ast.Expr):
return False
if not isinstance(root.body[0].value, ast.Name):
return False
if root.body[0].value.id != ident:
return False
return True
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