ansible/test/sanity/validate-modules/utils.py

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# -*- coding: utf-8 -*-
#
# Copyright (C) 2015 Matt Martz <matt@sivel.net>
# Copyright (C) 2015 Rackspace US, Inc.
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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import ast
import os
import sys
from io import BytesIO, TextIOWrapper
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import yaml
import yaml.reader
from ansible.module_utils._text import to_text
from ansible.module_utils.basic import AnsibleModule
class AnsibleTextIOWrapper(TextIOWrapper):
def write(self, s):
super(AnsibleTextIOWrapper, self).write(to_text(s, self.encoding, errors='replace'))
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def find_executable(executable, cwd=None, path=None):
"""Finds the full path to the executable specified"""
# This is mostly a copy from test/runner/lib/util.py. Should be removed once validate-modules has been integrated
# into ansible-test
match = None
real_cwd = os.getcwd()
if not cwd:
cwd = real_cwd
if os.path.dirname(executable):
target = os.path.join(cwd, executable)
if os.path.exists(target) and os.access(target, os.F_OK | os.X_OK):
match = executable
else:
path = os.environ.get('PATH', os.path.defpath)
path_dirs = path.split(os.path.pathsep)
seen_dirs = set()
for path_dir in path_dirs:
if path_dir in seen_dirs:
continue
seen_dirs.add(path_dir)
if os.path.abspath(path_dir) == real_cwd:
path_dir = cwd
candidate = os.path.join(path_dir, executable)
if os.path.exists(candidate) and os.access(candidate, os.F_OK | os.X_OK):
match = candidate
break
return match
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def find_globals(g, tree):
"""Uses AST to find globals in an ast tree"""
for child in tree:
if hasattr(child, 'body') and isinstance(child.body, list):
find_globals(g, child.body)
elif isinstance(child, (ast.FunctionDef, ast.ClassDef)):
g.add(child.name)
continue
elif isinstance(child, ast.Assign):
try:
g.add(child.targets[0].id)
except (IndexError, AttributeError):
pass
elif isinstance(child, ast.Import):
g.add(child.names[0].name)
elif isinstance(child, ast.ImportFrom):
for name in child.names:
g_name = name.asname or name.name
if g_name == '*':
continue
g.add(g_name)
class CaptureStd():
"""Context manager to handle capturing stderr and stdout"""
def __enter__(self):
self.sys_stdout = sys.stdout
self.sys_stderr = sys.stderr
sys.stdout = self.stdout = AnsibleTextIOWrapper(BytesIO(), encoding=self.sys_stdout.encoding)
sys.stderr = self.stderr = AnsibleTextIOWrapper(BytesIO(), encoding=self.sys_stderr.encoding)
return self
def __exit__(self, exc_type, exc_value, traceback):
sys.stdout = self.sys_stdout
sys.stderr = self.sys_stderr
def get(self):
"""Return ``(stdout, stderr)``"""
return self.stdout.buffer.getvalue(), self.stderr.buffer.getvalue()
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def parse_yaml(value, lineno, module, name, load_all=False):
traces = []
errors = []
data = None
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if load_all:
loader = yaml.safe_load_all
else:
loader = yaml.safe_load
try:
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data = loader(value)
if load_all:
data = list(data)
except yaml.MarkedYAMLError as e:
e.problem_mark.line += lineno - 1
e.problem_mark.name = '%s.%s' % (module, name)
errors.append({
'msg': '%s is not valid YAML' % name,
'line': e.problem_mark.line + 1,
'column': e.problem_mark.column + 1
})
traces.append(e)
except yaml.reader.ReaderError as e:
traces.append(e)
# TODO: Better line/column detection
errors.append({
'msg': ('%s is not valid YAML. Character '
'0x%x at position %d.' % (name, e.character, e.position)),
'line': lineno
})
except yaml.YAMLError as e:
traces.append(e)
errors.append({
'msg': '%s is not valid YAML: %s: %s' % (name, type(e), e),
'line': lineno
})
return data, errors, traces
def is_empty(value):
"""Evaluate null like values excluding False"""
if value is False:
return False
return not bool(value)
def compare_unordered_lists(a, b):
"""Safe list comparisons
Supports:
- unordered lists
- unhashable elements
"""
return len(a) == len(b) and all(x in b for x in a)
class NoArgsAnsibleModule(AnsibleModule):
"""AnsibleModule that does not actually load params. This is used to get access to the
methods within AnsibleModule without having to fake a bunch of data
"""
def _load_params(self):
AnsiballZ improvements Now that we don't need to worry about python-2.4 and 2.5, we can make some improvements to the way AnsiballZ handles modules. * Change AnsiballZ wrapper to use import to invoke the module We need the module to think of itself as a script because it could be coded as: main() or as: if __name__ == '__main__': main() Or even as: if __name__ == '__main__': random_function_name() A script will invoke all of those. Prior to this change, we invoked a second Python interpreter on the module so that it really was a script. However, this means that we have to run python twice (once for the AnsiballZ wrapper and once for the module). This change makes the module think that it is a script (because __name__ in the module == '__main__') but it's actually being invoked by us importing the module code. There's three ways we've come up to do this. * The most elegant is to use zipimporter and tell the import mechanism that the module being loaded is __main__: * https://github.com/abadger/ansible/blob/5959f11c9ddb7b6eaa9c3214560bd85e631d4055/lib/ansible/executor/module_common.py#L175 * zipimporter is nice because we do not have to extract the module from the zip file and save it to the disk when we do that. The import machinery does it all for us. * The drawback is that modules do not have a __file__ which points to a real file when they do this. Modules could be using __file__ to for a variety of reasons, most of those probably have replacements (the most common one is to find a writable directory for temporary files. AnsibleModule.tmpdir should be used instead) We can monkeypatch __file__ in fom AnsibleModule initialization but that's kind of gross. There's no way I can see to do this from the wrapper. * Next, there's imp.load_module(): * https://github.com/abadger/ansible/blob/340edf7489/lib/ansible/executor/module_common.py#L151 * imp has the nice property of allowing us to set __name__ to __main__ without changing the name of the file itself * We also don't have to do anything special to set __file__ for backwards compatibility (although the reason for that is the drawback): * Its drawback is that it requires the file to exist on disk so we have to explicitly extract it from the zipfile and save it to a temporary file * The last choice is to use exec to execute the module: * https://github.com/abadger/ansible/blob/f47a4ccc76/lib/ansible/executor/module_common.py#L175 * The code we would have to maintain for this looks pretty clean. In the wrapper we create a ModuleType, set __file__ on it, read the module's contents in from the zip file and then exec it. * Drawbacks: We still have to explicitly extract the file's contents from the zip archive instead of letting python's import mechanism handle it. * Exec also has hidden performance issues and breaks certain assumptions that modules could be making about their own code: http://lucumr.pocoo.org/2011/2/1/exec-in-python/ Our plan is to use imp.load_module() for now, deprecate the use of __file__ in modules, and switch to zipimport once the deprecation period for __file__ is over (without monkeypatching a fake __file__ in via AnsibleModule). * Rename the name of the AnsiBallZ wrapped module This makes it obvious that the wrapped module isn't the module file that we distribute. It's part of trying to mitigate the fact that the module is now named __main)).py in tracebacks. * Shield all wrapper symbols inside of a function With the new import code, all symbols in the wrapper become visible in the module. To mitigate the chance of collisions, move most symbols into a toplevel function. The only symbols left in the global namespace are now _ANSIBALLZ_WRAPPER and _ansiballz_main. revised porting guide entry Integrate code coverage collection into AnsiballZ. ci_coverage ci_complete
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self.params = {'_ansible_selinux_special_fs': [], '_ansible_remote_tmp': '/tmp', '_ansible_keep_remote_files': False, '_ansible_check_mode': False}