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""" ``bcfg2-lint`` plugin for :ref:`TemplateHelper
<server-plugins-connectors-templatehelper>` """
import sys
import imp
from Bcfg2.Server.Lint import ServerPlugin
from Bcfg2.Server.Plugins.TemplateHelper import HelperModule, MODULE_RE
from Bcfg2.Utils import safe_module_name
class TemplateHelper(ServerPlugin):
""" ``bcfg2-lint`` plugin to ensure that all :ref:`TemplateHelper
<server-plugins-connectors-templatehelper>` modules are valid.
This can check for:
* A TemplateHelper module that cannot be imported due to syntax or
other compile-time errors;
* A TemplateHelper module that does not have an ``__export__``
attribute, or whose ``__export__`` is not a list;
* Bogus symbols listed in ``__export__``, including symbols that
don't exist, that are reserved, or that start with underscores.
"""
__serverplugin__ = 'TemplateHelper'
def __init__(self, *args, **kwargs):
ServerPlugin.__init__(self, *args, **kwargs)
# we instantiate a dummy helper to discover which keywords and
# defaults are reserved
dummy = HelperModule("foo.py")
self.reserved_keywords = dir(dummy)
self.reserved_defaults = dummy.reserved_defaults
def Run(self):
for helper in self.core.plugins['TemplateHelper'].entries.values():
if self.HandlesFile(helper.name):
self.check_helper(helper.name)
def check_helper(self, helper):
""" Check a single helper module.
:param helper: The filename of the helper module
:type helper: string
"""
module_name = MODULE_RE.search(helper).group(1)
try:
module = imp.load_source(
safe_module_name('TemplateHelper', module_name), helper)
except: # pylint: disable=W0702
err = sys.exc_info()[1]
self.LintError("templatehelper-import-error",
"Failed to import %s: %s" %
(helper, err))
return
if not hasattr(module, "__export__"):
self.LintError("templatehelper-no-export",
"%s has no __export__ list" % helper)
return
elif not isinstance(module.__export__, list):
self.LintError("templatehelper-nonlist-export",
"__export__ is not a list in %s" % helper)
return
for sym in module.__export__:
if not hasattr(module, sym):
self.LintError("templatehelper-nonexistent-export",
"%s: exported symbol %s does not exist" %
(helper, sym))
elif sym in self.reserved_keywords:
self.LintError("templatehelper-reserved-export",
"%s: exported symbol %s is reserved" %
(helper, sym))
elif sym.startswith("_"):
self.LintError("templatehelper-underscore-export",
"%s: exported symbol %s starts with underscore"
% (helper, sym))
if sym in getattr(module, "__default__", []):
self.LintError("templatehelper-export-and-default",
"%s: %s is listed in both __default__ and "
"__export__" % (helper, sym))
for sym in getattr(module, "__default__", []):
if sym in self.reserved_defaults:
self.LintError("templatehelper-reserved-default",
"%s: default symbol %s is reserved" %
(helper, sym))
@classmethod
def Errors(cls):
return {"templatehelper-import-error": "error",
"templatehelper-no-export": "error",
"templatehelper-nonlist-export": "error",
"templatehelper-nonexistent-export": "error",
"templatehelper-reserved-export": "error",
"templatehelper-reserved-default": "error",
"templatehelper-underscore-export": "warning",
"templatehelper-export-and-default": "warning"}
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