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__pycache__ dir drwxr-xr-x 2024-10-07 16:37 R D
scripts dir drwxr-xr-x 2024-09-24 14:10 R D
  __init__.py 18.214 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  __main__.py 0.142 KB -rw-r--r-- 2018-12-23 21:37 R E G D
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""" Virtual environment (venv) package for Python. Based on PEP 405. Copyright (C) 2011-2014 Vinay Sajip. Licensed to the PSF under a contributor agreement. """ import logging import os import shutil import subprocess import sys import types logger = logging.getLogger(__name__) class EnvBuilder: """ This class exists to allow virtual environment creation to be customized. The constructor parameters determine the builder's behaviour when called upon to create a virtual environment. By default, the builder makes the system (global) site-packages dir *un*available to the created environment. If invoked using the Python -m option, the default is to use copying on Windows platforms but symlinks elsewhere. If instantiated some other way, the default is to *not* use symlinks. :param system_site_packages: If True, the system (global) site-packages dir is available to created environments. :param clear: If True, delete the contents of the environment directory if it already exists, before environment creation. :param symlinks: If True, attempt to symlink rather than copy files into virtual environment. :param upgrade: If True, upgrade an existing virtual environment. :param with_pip: If True, ensure pip is installed in the virtual environment :param prompt: Alternative terminal prefix for the environment. """ def __init__(self, system_site_packages=False, clear=False, symlinks=False, upgrade=False, with_pip=False, prompt=None): self.system_site_packages = system_site_packages self.clear = clear self.symlinks = symlinks self.upgrade = upgrade self.with_pip = with_pip self.prompt = prompt def create(self, env_dir): """ Create a virtual environment in a directory. :param env_dir: The target directory to create an environment in. """ env_dir = os.path.abspath(env_dir) context = self.ensure_directories(env_dir) # See issue 24875. We need system_site_packages to be False # until after pip is installed. true_system_site_packages = self.system_site_packages self.system_site_packages = False self.create_configuration(context) self.setup_python(context) if self.with_pip: self._setup_pip(context) if not self.upgrade: self.setup_scripts(context) self.post_setup(context) if true_system_site_packages: # We had set it to False before, now # restore it and rewrite the configuration self.system_site_packages = True self.create_configuration(context) def clear_directory(self, path): for fn in os.listdir(path): fn = os.path.join(path, fn) if os.path.islink(fn) or os.path.isfile(fn): os.remove(fn) elif os.path.isdir(fn): shutil.rmtree(fn) def ensure_directories(self, env_dir): """ Create the directories for the environment. Returns a context object which holds paths in the environment, for use by subsequent logic. """ def create_if_needed(d): if not os.path.exists(d): os.makedirs(d) elif os.path.islink(d) or os.path.isfile(d): raise ValueError('Unable to create directory %r' % d) if os.path.exists(env_dir) and self.clear: self.clear_directory(env_dir) context = types.SimpleNamespace() context.env_dir = env_dir context.env_name = os.path.split(env_dir)[1] prompt = self.prompt if self.prompt is not None else context.env_name context.prompt = '(%s) ' % prompt create_if_needed(env_dir) env = os.environ if sys.platform == 'darwin' and '__PYVENV_LAUNCHER__' in env: executable = os.environ['__PYVENV_LAUNCHER__'] else: executable = sys.executable dirname, exename = os.path.split(os.path.abspath(executable)) context.executable = executable context.python_dir = dirname context.python_exe = exename if sys.platform == 'win32': binname = 'Scripts' incpath = 'Include' libpath = os.path.join(env_dir, 'Lib', 'site-packages') else: binname = 'bin' incpath = 'include' libpath = os.path.join(env_dir, 'lib', 'python%d.%d' % sys.version_info[:2], 'site-packages') context.inc_path = path = os.path.join(env_dir, incpath) create_if_needed(path) create_if_needed(libpath) # Issue 21197: create lib64 as a symlink to lib on 64-bit non-OS X POSIX if ((sys.maxsize > 2**32) and (os.name == 'posix') and (sys.platform != 'darwin')): link_path = os.path.join(env_dir, 'lib64') if not os.path.exists(link_path): # Issue #21643 os.symlink('lib', link_path) context.bin_path = binpath = os.path.join(env_dir, binname) context.bin_name = binname context.env_exe = os.path.join(binpath, exename) create_if_needed(binpath) return context def create_configuration(self, context): """ Create a configuration file indicating where the environment's Python was copied from, and whether the system site-packages should be made available in the environment. :param context: The information for the environment creation request being processed. """ context.cfg_path = path = os.path.join(context.env_dir, 'pyvenv.cfg') with open(path, 'w', encoding='utf-8') as f: f.write('home = %s\n' % context.python_dir) if self.system_site_packages: incl = 'true' else: incl = 'false' f.write('include-system-site-packages = %s\n' % incl) f.write('version = %d.%d.%d\n' % sys.version_info[:3]) if os.name == 'nt': def include_binary(self, f): if f.endswith(('.pyd', '.dll')): result = True else: result = f.startswith('python') and f.endswith('.exe') return result def symlink_or_copy(self, src, dst, relative_symlinks_ok=False): """ Try symlinking a file, and if that fails, fall back to copying. """ force_copy = not self.symlinks if not force_copy: try: if not os.path.islink(dst): # can't link to itself! if relative_symlinks_ok: assert os.path.dirname(src) == os.path.dirname(dst) os.symlink(os.path.basename(src), dst) else: os.symlink(src, dst) except Exception: # may need to use a more specific exception logger.warning('Unable to symlink %r to %r', src, dst) force_copy = True if force_copy: shutil.copyfile(src, dst) def setup_python(self, context): """ Set up a Python executable in the environment. :param context: The information for the environment creation request being processed. """ binpath = context.bin_path path = context.env_exe copier = self.symlink_or_copy copier(context.executable, path) dirname = context.python_dir if os.name != 'nt': if not os.path.islink(path): os.chmod(path, 0o755) for suffix in ('python', 'python3'): path = os.path.join(binpath, suffix) if not os.path.exists(path): # Issue 18807: make copies if # symlinks are not wanted copier(context.env_exe, path, relative_symlinks_ok=True) if not os.path.islink(path): os.chmod(path, 0o755) else: subdir = 'DLLs' include = self.include_binary files = [f for f in os.listdir(dirname) if include(f)] for f in files: src = os.path.join(dirname, f) dst = os.path.join(binpath, f) if dst != context.env_exe: # already done, above copier(src, dst) dirname = os.path.join(dirname, subdir) if os.path.isdir(dirname): files = [f for f in os.listdir(dirname) if include(f)] for f in files: src = os.path.join(dirname, f) dst = os.path.join(binpath, f) copier(src, dst) # copy init.tcl over for root, dirs, files in os.walk(context.python_dir): if 'init.tcl' in files: tcldir = os.path.basename(root) tcldir = os.path.join(context.env_dir, 'Lib', tcldir) if not os.path.exists(tcldir): os.makedirs(tcldir) src = os.path.join(root, 'init.tcl') dst = os.path.join(tcldir, 'init.tcl') shutil.copyfile(src, dst) break def _setup_pip(self, context): """Installs or upgrades pip in a virtual environment""" # We run ensurepip in isolated mode to avoid side effects from # environment vars, the current directory and anything else # intended for the global Python environment cmd = [context.env_exe, '-Im', 'ensurepip', '--upgrade', '--default-pip'] subprocess.check_output(cmd, stderr=subprocess.STDOUT) def setup_scripts(self, context): """ Set up scripts into the created environment from a directory. This method installs the default scripts into the environment being created. You can prevent the default installation by overriding this method if you really need to, or if you need to specify a different location for the scripts to install. By default, the 'scripts' directory in the venv package is used as the source of scripts to install. """ path = os.path.abspath(os.path.dirname(__file__)) path = os.path.join(path, 'scripts') self.install_scripts(context, path) def post_setup(self, context): """ Hook for post-setup modification of the venv. Subclasses may install additional packages or scripts here, add activation shell scripts, etc. :param context: The information for the environment creation request being processed. """ pass def replace_variables(self, text, context): """ Replace variable placeholders in script text with context-specific variables. Return the text passed in , but with variables replaced. :param text: The text in which to replace placeholder variables. :param context: The information for the environment creation request being processed. """ text = text.replace('__VENV_DIR__', context.env_dir) text = text.replace('__VENV_NAME__', context.env_name) text = text.replace('__VENV_PROMPT__', context.prompt) text = text.replace('__VENV_BIN_NAME__', context.bin_name) text = text.replace('__VENV_PYTHON__', context.env_exe) return text def install_scripts(self, context, path): """ Install scripts into the created environment from a directory. :param context: The information for the environment creation request