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78 lines
3.2 KiB
Python
78 lines
3.2 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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import v2.config as C
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from v2.utils import template
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from v2.utils import list_union
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class Conditional(object):
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def __init__(self, basedir, conditionals=[]):
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self.basedir = basedir
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self.conditionals = conditionals
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def push(self, conditional):
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if conditional not in self.conditionals:
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self.conditionals.append(conditional)
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def get_conditionals(self):
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# return a full slice to make sure the reference
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# doesn't get mangled by other users of the result
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return self.conditionals[:]
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def merge(self, conditional):
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if isinstance(conditional, basestring):
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conditional = Conditional(self.basedir, [conditional])
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elif isinstance(conditional, list):
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conditional = Conditional(self.basedir, conditional)
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elif not isinstance(conditional, Conditional):
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raise AnsibleError('expected a Conditional() class, instead got a %s' % type(conditional))
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self.conditionals = list_union(self.conditionals, conditional.get_conditonals())
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def evaluate(self, inject):
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for conditional in self.conditional:
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if not self._do_evaluate(conditional, inject):
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return False
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return True
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def _do_evaluate(self, conditional, inject):
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# allow variable names
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if conditional in inject and '-' not in str(inject[conditional]):
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conditional = inject[conditional]
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conditional = template.template(self.basedir, conditional, inject, fail_on_undefined=C.fail_on_undefined)
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original = str(conditional).replace("jinja2_compare ","")
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# a Jinja2 evaluation that results in something Python can eval!
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presented = "{%% if %s %%} True {%% else %%} False {%% endif %%}" % conditional
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conditional = template.template(self.basedir, presented, inject)
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val = conditional.strip()
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if val == presented:
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# the templating failed, meaning most likely a
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# variable was undefined. If we happened to be
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# looking for an undefined variable, return True,
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# otherwise fail
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if "is undefined" in conditional:
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return True
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elif "is defined" in conditional:
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return False
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else:
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raise errors.AnsibleError("error while evaluating conditional: %s" % original)
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elif val == "True":
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return True
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elif val == "False":
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return False
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else:
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raise errors.AnsibleError("unable to evaluate conditional: %s" % original)
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