2016-11-30 05:21:53 +00:00
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#!/usr/bin/env python
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2017-05-11 05:25:02 +00:00
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"""Interpreter and code coverage injector for use with ansible-test.
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The injector serves two main purposes:
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1) Control the python interpreter used to run test tools and ansible code.
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2) Provide optional code coverage analysis of ansible code.
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The injector is executed one of two ways:
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1) On the controller via a symbolic link such as ansible or pytest.
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This is accomplished by prepending the injector directory to the PATH by ansible-test.
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2) As the python interpreter when running ansible modules.
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This is only supported when connecting to the local host.
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Otherwise set the ANSIBLE_TEST_REMOTE_INTERPRETER environment variable.
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It can be empty to auto-detect the python interpreter on the remote host.
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If not empty it will be used to set ansible_python_interpreter.
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NOTE: Running ansible-test with the --tox option or inside a virtual environment
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may prevent the injector from working for tests which use connection
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types other than local, or which use become, due to lack of permissions
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to access the interpreter for the virtual environment.
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"""
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2016-11-30 05:21:53 +00:00
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from __future__ import absolute_import, print_function
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2017-05-11 05:25:02 +00:00
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import json
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2016-11-30 05:21:53 +00:00
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import os
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import sys
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import pipes
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import logging
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import getpass
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2018-10-09 02:18:49 +00:00
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import resource
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2016-11-30 05:21:53 +00:00
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logger = logging.getLogger('injector') # pylint: disable=locally-disabled, invalid-name
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2017-05-11 05:25:02 +00:00
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# pylint: disable=locally-disabled, invalid-name
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config = None # type: InjectorConfig
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class InjectorConfig(object):
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"""Mandatory configuration."""
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def __init__(self, config_path):
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"""Initialize config."""
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with open(config_path) as config_fd:
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_config = json.load(config_fd)
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self.python_interpreter = _config['python_interpreter']
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self.coverage_file = _config['coverage_file']
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# Read from the environment instead of config since it needs to be changed by integration test scripts.
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# It also does not need to flow from the controller to the remote. It is only used on the controller.
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self.remote_interpreter = os.environ.get('ANSIBLE_TEST_REMOTE_INTERPRETER', None)
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self.arguments = [to_text(c) for c in sys.argv]
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def to_text(value):
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"""
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:type value: str | None
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:rtype: str | None
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"""
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if value is None:
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return None
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if isinstance(value, bytes):
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return value.decode('utf-8')
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return u'%s' % value
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2016-11-30 05:21:53 +00:00
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def main():
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"""Main entry point."""
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2017-05-11 05:25:02 +00:00
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global config # pylint: disable=locally-disabled, global-statement
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2016-12-01 00:26:47 +00:00
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formatter = logging.Formatter('%(asctime)s %(process)d %(levelname)s %(message)s')
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2016-11-30 05:21:53 +00:00
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log_name = 'ansible-test-coverage.%s.log' % getpass.getuser()
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self_dir = os.path.dirname(os.path.abspath(__file__))
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handler = logging.FileHandler(os.path.join('/tmp', log_name))
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handler.setFormatter(formatter)
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logger.addHandler(handler)
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handler = logging.FileHandler(os.path.abspath(os.path.join(self_dir, '..', 'logs', log_name)))
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handler.setFormatter(formatter)
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logger.addHandler(handler)
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logger.setLevel(logging.DEBUG)
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try:
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logger.debug('Self: %s', __file__)
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2018-10-09 02:18:49 +00:00
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# to achieve a consistent nofile ulimit, set to 16k here, this can affect performance in subprocess.Popen when
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# being called with close_fds=True on Python (8x the time on some environments)
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nofile_limit = 16 * 1024
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current_limit = resource.getrlimit(resource.RLIMIT_NOFILE)
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new_limit = (nofile_limit, nofile_limit)
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if current_limit > new_limit:
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logger.debug('RLIMIT_NOFILE: %s -> %s', current_limit, new_limit)
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resource.setrlimit(resource.RLIMIT_NOFILE, (nofile_limit, nofile_limit))
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else:
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logger.debug('RLIMIT_NOFILE: %s', current_limit)
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2017-05-11 05:25:02 +00:00
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config_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'injector.json')
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try:
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config = InjectorConfig(config_path)
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except IOError:
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logger.exception('Error reading config: %s', config_path)
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exit('No injector config found. Set ANSIBLE_TEST_REMOTE_INTERPRETER if the test is not connecting to the local host.')
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logger.debug('Arguments: %s', ' '.join(pipes.quote(c) for c in config.arguments))
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logger.debug('Python interpreter: %s', config.python_interpreter)
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logger.debug('Remote interpreter: %s', config.remote_interpreter)
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logger.debug('Coverage file: %s', config.coverage_file)
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if os.path.basename(__file__) == 'injector.py':
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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
2018-06-20 18:23:59 +00:00
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args, env = runner() # code coverage collection is baked into the AnsiballZ wrapper when needed
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2018-09-21 17:33:35 +00:00
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elif os.path.basename(__file__) == 'python.py':
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args, env = python() # run arbitrary python commands using the correct python and with optional code coverage
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2016-11-30 05:21:53 +00:00
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else:
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args, env = injector()
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logger.debug('Run command: %s', ' '.join(pipes.quote(c) for c in args))
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for key in sorted(env.keys()):
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logger.debug('%s=%s', key, env[key])
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os.execvpe(args[0], args, env)
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except Exception as ex:
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logger.fatal(ex)
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raise
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2018-09-21 17:33:35 +00:00
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def python():
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"""
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:rtype: list[str], dict[str, str]
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"""
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if config.coverage_file:
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args, env = coverage_command()
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else:
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args, env = [config.python_interpreter], os.environ.copy()
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args += config.arguments[1:]
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return args, env
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2016-11-30 05:21:53 +00:00
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def injector():
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"""
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:rtype: list[str], dict[str, str]
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"""
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command = os.path.basename(__file__)
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2018-11-01 02:49:48 +00:00
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run_as_python_module = (
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'pytest',
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)
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if command in run_as_python_module:
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executable_args = ['-m', command]
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else:
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executable_args = [find_executable(command)]
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2016-11-30 05:21:53 +00:00
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2017-05-11 05:25:02 +00:00
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if config.coverage_file:
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args, env = coverage_command()
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else:
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args, env = [config.python_interpreter], os.environ.copy()
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2018-11-01 02:49:48 +00:00
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args += executable_args
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2017-05-11 05:25:02 +00:00
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if command in ('ansible', 'ansible-playbook', 'ansible-pull'):
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if config.remote_interpreter is None:
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interpreter = os.path.join(os.path.dirname(__file__), 'injector.py')
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elif config.remote_interpreter == '':
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interpreter = None
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2016-11-30 05:21:53 +00:00
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else:
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2017-05-11 05:25:02 +00:00
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interpreter = config.remote_interpreter
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2016-11-30 05:21:53 +00:00
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2017-05-11 05:25:02 +00:00
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if interpreter:
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2016-11-30 05:21:53 +00:00
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args += ['--extra-vars', 'ansible_python_interpreter=' + interpreter]
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2017-05-11 05:25:02 +00:00
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args += config.arguments[1:]
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2016-11-30 05:21:53 +00:00
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return args, env
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def runner():
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"""
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:rtype: list[str], dict[str, str]
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"""
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2017-05-11 05:25:02 +00:00
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args, env = [config.python_interpreter], os.environ.copy()
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2016-11-30 05:21:53 +00:00
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2017-05-11 05:25:02 +00:00
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args += config.arguments[1:]
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2016-11-30 05:21:53 +00:00
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return args, env
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2017-05-11 05:25:02 +00:00
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def coverage_command():
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2016-11-30 05:21:53 +00:00
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"""
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:rtype: list[str], dict[str, str]
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"""
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2017-05-11 05:25:02 +00:00
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self_dir = os.path.dirname(os.path.abspath(__file__))
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2016-11-30 05:21:53 +00:00
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args = [
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2017-05-11 05:25:02 +00:00
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config.python_interpreter,
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'-m',
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'coverage.__main__',
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2016-11-30 05:21:53 +00:00
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'run',
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'--rcfile',
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os.path.join(self_dir, '.coveragerc'),
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]
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env = os.environ.copy()
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2017-05-11 05:25:02 +00:00
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env['COVERAGE_FILE'] = config.coverage_file
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2016-11-30 05:21:53 +00:00
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return args, env
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def find_executable(executable):
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"""
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:type executable: str
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:rtype: str
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"""
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self = os.path.abspath(__file__)
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2018-09-21 18:38:22 +00:00
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path = os.environ.get('PATH', os.path.defpath)
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2016-11-30 05:21:53 +00:00
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seen_dirs = set()
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2018-09-21 18:38:22 +00:00
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for path_dir in path.split(os.path.pathsep):
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2016-11-30 05:21:53 +00:00
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if path_dir in seen_dirs:
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continue
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seen_dirs.add(path_dir)
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candidate = os.path.abspath(os.path.join(path_dir, executable))
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if candidate == self:
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continue
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if os.path.exists(candidate) and os.access(candidate, os.F_OK | os.X_OK):
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return candidate
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raise Exception('Executable "%s" not found in path: %s' % (executable, path))
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if __name__ == '__main__':
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main()
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