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96 lines
3.2 KiB
Python
96 lines
3.2 KiB
Python
from .. import util
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import contextlib
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import errno
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import functools
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import os
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import os.path
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import sys
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import tempfile
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from test import support
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def writes_bytecode_files(fxn):
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"""Decorator to protect sys.dont_write_bytecode from mutation and to skip
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tests that require it to be set to False."""
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if sys.dont_write_bytecode:
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return lambda *args, **kwargs: None
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@functools.wraps(fxn)
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def wrapper(*args, **kwargs):
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original = sys.dont_write_bytecode
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sys.dont_write_bytecode = False
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try:
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to_return = fxn(*args, **kwargs)
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finally:
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sys.dont_write_bytecode = original
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return to_return
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return wrapper
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def ensure_bytecode_path(bytecode_path):
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"""Ensure that the __pycache__ directory for PEP 3147 pyc file exists.
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:param bytecode_path: File system path to PEP 3147 pyc file.
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"""
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try:
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os.mkdir(os.path.dirname(bytecode_path))
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except OSError as error:
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if error.errno != errno.EEXIST:
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raise
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@contextlib.contextmanager
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def create_modules(*names):
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"""Temporarily create each named module with an attribute (named 'attr')
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that contains the name passed into the context manager that caused the
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creation of the module.
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All files are created in a temporary directory returned by
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tempfile.mkdtemp(). This directory is inserted at the beginning of
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sys.path. When the context manager exits all created files (source and
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bytecode) are explicitly deleted.
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No magic is performed when creating packages! This means that if you create
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a module within a package you must also create the package's __init__ as
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well.
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"""
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source = 'attr = {0!r}'
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created_paths = []
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mapping = {}
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state_manager = None
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uncache_manager = None
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try:
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temp_dir = tempfile.mkdtemp()
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mapping['.root'] = temp_dir
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import_names = set()
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for name in names:
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if not name.endswith('__init__'):
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import_name = name
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else:
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import_name = name[:-len('.__init__')]
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import_names.add(import_name)
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if import_name in sys.modules:
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del sys.modules[import_name]
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name_parts = name.split('.')
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file_path = temp_dir
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for directory in name_parts[:-1]:
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file_path = os.path.join(file_path, directory)
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if not os.path.exists(file_path):
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os.mkdir(file_path)
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created_paths.append(file_path)
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file_path = os.path.join(file_path, name_parts[-1] + '.py')
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with open(file_path, 'w') as file:
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file.write(source.format(name))
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created_paths.append(file_path)
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mapping[name] = file_path
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uncache_manager = util.uncache(*import_names)
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uncache_manager.__enter__()
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state_manager = util.import_state(path=[temp_dir])
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state_manager.__enter__()
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yield mapping
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finally:
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if state_manager is not None:
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state_manager.__exit__(None, None, None)
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if uncache_manager is not None:
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uncache_manager.__exit__(None, None, None)
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support.rmtree(temp_dir)
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