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526 lines
23 KiB
526 lines
23 KiB
1 year ago
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"""
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Virtual environment (venv) package for Python. Based on PEP 405.
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Copyright (C) 2011-2014 Vinay Sajip.
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Licensed to the PSF under a contributor agreement.
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"""
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import logging
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import os
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import shutil
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import subprocess
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import sys
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import sysconfig
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import types
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CORE_VENV_DEPS = ('pip', 'setuptools')
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logger = logging.getLogger(__name__)
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class EnvBuilder:
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"""
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This class exists to allow virtual environment creation to be
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customized. The constructor parameters determine the builder's
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behaviour when called upon to create a virtual environment.
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By default, the builder makes the system (global) site-packages dir
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*un*available to the created environment.
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If invoked using the Python -m option, the default is to use copying
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on Windows platforms but symlinks elsewhere. If instantiated some
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other way, the default is to *not* use symlinks.
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:param system_site_packages: If True, the system (global) site-packages
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dir is available to created environments.
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:param clear: If True, delete the contents of the environment directory if
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it already exists, before environment creation.
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:param symlinks: If True, attempt to symlink rather than copy files into
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virtual environment.
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:param upgrade: If True, upgrade an existing virtual environment.
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:param with_pip: If True, ensure pip is installed in the virtual
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environment
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:param prompt: Alternative terminal prefix for the environment.
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:param upgrade_deps: Update the base venv modules to the latest on PyPI
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"""
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def __init__(self, system_site_packages=False, clear=False,
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symlinks=False, upgrade=False, with_pip=False, prompt=None,
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upgrade_deps=False):
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self.system_site_packages = system_site_packages
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self.clear = clear
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self.symlinks = symlinks
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self.upgrade = upgrade
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self.with_pip = with_pip
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if prompt == '.': # see bpo-38901
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prompt = os.path.basename(os.getcwd())
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self.prompt = prompt
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self.upgrade_deps = upgrade_deps
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def create(self, env_dir):
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"""
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Create a virtual environment in a directory.
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:param env_dir: The target directory to create an environment in.
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"""
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env_dir = os.path.abspath(env_dir)
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context = self.ensure_directories(env_dir)
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# See issue 24875. We need system_site_packages to be False
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# until after pip is installed.
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true_system_site_packages = self.system_site_packages
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self.system_site_packages = False
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self.create_configuration(context)
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self.setup_python(context)
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if self.with_pip:
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self._setup_pip(context)
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if not self.upgrade:
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self.setup_scripts(context)
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self.post_setup(context)
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if true_system_site_packages:
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# We had set it to False before, now
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# restore it and rewrite the configuration
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self.system_site_packages = True
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self.create_configuration(context)
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if self.upgrade_deps:
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self.upgrade_dependencies(context)
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def clear_directory(self, path):
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for fn in os.listdir(path):
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fn = os.path.join(path, fn)
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if os.path.islink(fn) or os.path.isfile(fn):
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os.remove(fn)
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elif os.path.isdir(fn):
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shutil.rmtree(fn)
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def ensure_directories(self, env_dir):
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"""
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Create the directories for the environment.
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Returns a context object which holds paths in the environment,
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for use by subsequent logic.
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"""
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def create_if_needed(d):
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if not os.path.exists(d):
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os.makedirs(d)
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elif os.path.islink(d) or os.path.isfile(d):
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raise ValueError('Unable to create directory %r' % d)
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if os.path.exists(env_dir) and self.clear:
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self.clear_directory(env_dir)
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context = types.SimpleNamespace()
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context.env_dir = env_dir
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context.env_name = os.path.split(env_dir)[1]
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prompt = self.prompt if self.prompt is not None else context.env_name
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context.prompt = '(%s) ' % prompt
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create_if_needed(env_dir)
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executable = sys._base_executable
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if not executable: # see gh-96861
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raise ValueError('Unable to determine path to the running '
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'Python interpreter. Provide an explicit path or '
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'check that your PATH environment variable is '
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'correctly set.')
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dirname, exename = os.path.split(os.path.abspath(executable))
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context.executable = executable
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context.python_dir = dirname
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context.python_exe = exename
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if sys.platform == 'win32':
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binname = 'Scripts'
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incpath = 'Include'
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libpath = os.path.join(env_dir, 'Lib', 'site-packages')
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else:
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binname = 'bin'
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incpath = 'include'
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libpath = os.path.join(env_dir, 'lib',
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'python%d.%d' % sys.version_info[:2],
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'site-packages')
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context.inc_path = path = os.path.join(env_dir, incpath)
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create_if_needed(path)
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create_if_needed(libpath)
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# Issue 21197: create lib64 as a symlink to lib on 64-bit non-OS X POSIX
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if ((sys.maxsize > 2**32) and (os.name == 'posix') and
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(sys.platform != 'darwin')):
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link_path = os.path.join(env_dir, 'lib64')
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if not os.path.exists(link_path): # Issue #21643
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os.symlink('lib', link_path)
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context.bin_path = binpath = os.path.join(env_dir, binname)
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context.bin_name = binname
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context.env_exe = os.path.join(binpath, exename)
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create_if_needed(binpath)
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# Assign and update the command to use when launching the newly created
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# environment, in case it isn't simply the executable script (e.g. bpo-45337)
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context.env_exec_cmd = context.env_exe
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if sys.platform == 'win32':
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# bpo-45337: Fix up env_exec_cmd to account for file system redirections.
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# Some redirects only apply to CreateFile and not CreateProcess
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real_env_exe = os.path.realpath(context.env_exe)
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if os.path.normcase(real_env_exe) != os.path.normcase(context.env_exe):
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logger.warning('Actual environment location may have moved due to '
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'redirects, links or junctions.\n'
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' Requested location: "%s"\n'
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' Actual location: "%s"',
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context.env_exe, real_env_exe)
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context.env_exec_cmd = real_env_exe
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return context
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def create_configuration(self, context):
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"""
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Create a configuration file indicating where the environment's Python
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was copied from, and whether the system site-packages should be made
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available in the environment.
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:param context: The information for the environment creation request
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being processed.
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"""
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context.cfg_path = path = os.path.join(context.env_dir, 'pyvenv.cfg')
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with open(path, 'w', encoding='utf-8') as f:
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f.write('home = %s\n' % context.python_dir)
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if self.system_site_packages:
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incl = 'true'
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else:
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incl = 'false'
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f.write('include-system-site-packages = %s\n' % incl)
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f.write('version = %d.%d.%d\n' % sys.version_info[:3])
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if self.prompt is not None:
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f.write(f'prompt = {self.prompt!r}\n')
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if os.name != 'nt':
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def symlink_or_copy(self, src, dst, relative_symlinks_ok=False):
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"""
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Try symlinking a file, and if that fails, fall back to copying.
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"""
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force_copy = not self.symlinks
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if not force_copy:
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try:
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if not os.path.islink(dst): # can't link to itself!
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if relative_symlinks_ok:
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assert os.path.dirname(src) == os.path.dirname(dst)
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os.symlink(os.path.basename(src), dst)
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else:
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os.symlink(src, dst)
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except Exception: # may need to use a more specific exception
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logger.warning('Unable to symlink %r to %r', src, dst)
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force_copy = True
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if force_copy:
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shutil.copyfile(src, dst)
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else:
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def symlink_or_copy(self, src, dst, relative_symlinks_ok=False):
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"""
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Try symlinking a file, and if that fails, fall back to copying.
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"""
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bad_src = os.path.lexists(src) and not os.path.exists(src)
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if self.symlinks and not bad_src and not os.path.islink(dst):
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try:
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if relative_symlinks_ok:
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assert os.path.dirname(src) == os.path.dirname(dst)
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os.symlink(os.path.basename(src), dst)
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else:
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os.symlink(src, dst)
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return
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except Exception: # may need to use a more specific exception
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logger.warning('Unable to symlink %r to %r', src, dst)
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# On Windows, we rewrite symlinks to our base python.exe into
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# copies of venvlauncher.exe
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basename, ext = os.path.splitext(os.path.basename(src))
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srcfn = os.path.join(os.path.dirname(__file__),
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"scripts",
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"nt",
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basename + ext)
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# Builds or venv's from builds need to remap source file
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# locations, as we do not put them into Lib/venv/scripts
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if sysconfig.is_python_build(True) or not os.path.isfile(srcfn):
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if basename.endswith('_d'):
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ext = '_d' + ext
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basename = basename[:-2]
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if basename == 'python':
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basename = 'venvlauncher'
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elif basename == 'pythonw':
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basename = 'venvwlauncher'
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src = os.path.join(os.path.dirname(src), basename + ext)
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else:
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src = srcfn
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if not os.path.exists(src):
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if not bad_src:
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logger.warning('Unable to copy %r', src)
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return
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shutil.copyfile(src, dst)
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def setup_python(self, context):
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"""
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Set up a Python executable in the environment.
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:param context: The information for the environment creation request
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being processed.
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"""
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binpath = context.bin_path
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path = context.env_exe
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copier = self.symlink_or_copy
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dirname = context.python_dir
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if os.name != 'nt':
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copier(context.executable, path)
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if not os.path.islink(path):
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os.chmod(path, 0o755)
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for suffix in ('python', 'python3', f'python3.{sys.version_info[1]}'):
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path = os.path.join(binpath, suffix)
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if not os.path.exists(path):
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# Issue 18807: make copies if
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# symlinks are not wanted
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copier(context.env_exe, path, relative_symlinks_ok=True)
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if not os.path.islink(path):
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os.chmod(path, 0o755)
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else:
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if self.symlinks:
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# For symlinking, we need a complete copy of the root directory
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# If symlinks fail, you'll get unnecessary copies of files, but
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# we assume that if you've opted into symlinks on Windows then
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# you know what you're doing.
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suffixes = [
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f for f in os.listdir(dirname) if
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os.path.normcase(os.path.splitext(f)[1]) in ('.exe', '.dll')
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]
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if sysconfig.is_python_build(True):
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suffixes = [
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f for f in suffixes if
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os.path.normcase(f).startswith(('python', 'vcruntime'))
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]
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else:
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suffixes = {'python.exe', 'python_d.exe', 'pythonw.exe', 'pythonw_d.exe'}
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base_exe = os.path.basename(context.env_exe)
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suffixes.add(base_exe)
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for suffix in suffixes:
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src = os.path.join(dirname, suffix)
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if os.path.lexists(src):
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copier(src, os.path.join(binpath, suffix))
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if sysconfig.is_python_build(True):
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# copy init.tcl
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for root, dirs, files in os.walk(context.python_dir):
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if 'init.tcl' in files:
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tcldir = os.path.basename(root)
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tcldir = os.path.join(context.env_dir, 'Lib', tcldir)
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if not os.path.exists(tcldir):
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os.makedirs(tcldir)
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src = os.path.join(root, 'init.tcl')
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dst = os.path.join(tcldir, 'init.tcl')
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shutil.copyfile(src, dst)
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break
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def _call_new_python(self, context, *py_args, **kwargs):
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"""Executes the newly created Python using safe-ish options"""
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# gh-98251: We do not want to just use '-I' because that masks
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# legitimate user preferences (such as not writing bytecode). All we
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# really need is to ensure that the path variables do not overrule
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# normal venv handling.
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args = [context.env_exec_cmd, *py_args]
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kwargs['env'] = env = os.environ.copy()
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env['VIRTUAL_ENV'] = context.env_dir
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env.pop('PYTHONHOME', None)
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env.pop('PYTHONPATH', None)
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kwargs['cwd'] = context.env_dir
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kwargs['executable'] = context.env_exec_cmd
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subprocess.check_output(args, **kwargs)
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def _setup_pip(self, context):
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"""Installs or upgrades pip in a virtual environment"""
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self._call_new_python(context, '-m', 'ensurepip', '--upgrade',
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'--default-pip', stderr=subprocess.STDOUT)
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def setup_scripts(self, context):
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"""
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Set up scripts into the created environment from a directory.
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This method installs the default scripts into the environment
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being created. You can prevent the default installation by overriding
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this method if you really need to, or if you need to specify
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a different location for the scripts to install. By default, the
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'scripts' directory in the venv package is used as the source of
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scripts to install.
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"""
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path = os.path.abspath(os.path.dirname(__file__))
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path = os.path.join(path, 'scripts')
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self.install_scripts(context, path)
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|
|
||
|
|
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
|
||
|
|
being processed.
|
||
|
|
:param path: Absolute pathname of a directory containing script.
|
||
|
|
Scripts in the 'common' subdirectory of this directory,
|
||
|
|
and those in the directory named for the platform
|
||
|
|
being run on, are installed in the created environment.
|
||
|
|
Placeholder variables are replaced with environment-
|
||
|
|
specific values.
|
||
|
|
"""
|
||
|
|
binpath = context.bin_path
|
||
|
|
plen = len(path)
|
||
|
|
for root, dirs, files in os.walk(path):
|
||
|
|
if root == path: # at top-level, remove irrelevant dirs
|
||
|
|
for d in dirs[:]:
|
||
|
|
if d not in ('common', os.name):
|
||
|
|
dirs.remove(d)
|
||
|
|
continue # ignore files in top level
|
||
|
|
for f in files:
|
||
|
|
if (os.name == 'nt' and f.startswith('python')
|
||
|
|
and f.endswith(('.exe', '.pdb'))):
|
||
|
|
continue
|
||
|
|
srcfile = os.path.join(root, f)
|
||
|
|
suffix = root[plen:].split(os.sep)[2:]
|
||
|
|
if not suffix:
|
||
|
|
dstdir = binpath
|
||
|
|
else:
|
||
|
|
dstdir = os.path.join(binpath, *suffix)
|
||
|
|
if not os.path.exists(dstdir):
|
||
|
|
os.makedirs(dstdir)
|
||
|
|
dstfile = os.path.join(dstdir, f)
|
||
|
|
with open(srcfile, 'rb') as f:
|
||
|
|
data = f.read()
|
||
|
|
if not srcfile.endswith(('.exe', '.pdb')):
|
||
|
|
try:
|
||
|
|
data = data.decode('utf-8')
|
||
|
|
data = self.replace_variables(data, context)
|
||
|
|
data = data.encode('utf-8')
|
||
|
|
except UnicodeError as e:
|
||
|
|
data = None
|
||
|
|
logger.warning('unable to copy script %r, '
|
||
|
|
'may be binary: %s', srcfile, e)
|
||
|
|
if data is not None:
|
||
|
|
with open(dstfile, 'wb') as f:
|
||
|
|
f.write(data)
|
||
|
|
shutil.copymode(srcfile, dstfile)
|
||
|
|
|
||
|
|
def upgrade_dependencies(self, context):
|
||
|
|
logger.debug(
|
||
|
|
f'Upgrading {CORE_VENV_DEPS} packages in {context.bin_path}'
|
||
|
|
)
|
||
|
|
self._call_new_python(context, '-m', 'pip', 'install', '--upgrade',
|
||
|
|
*CORE_VENV_DEPS)
|
||
|
|
|
||
|
|
|
||
|
|
def create(env_dir, system_site_packages=False, clear=False,
|
||
|
|
symlinks=False, with_pip=False, prompt=None, upgrade_deps=False):
|
||
|
|
"""Create a virtual environment in a directory."""
|
||
|
|
builder = EnvBuilder(system_site_packages=system_site_packages,
|
||
|
|
clear=clear, symlinks=symlinks, with_pip=with_pip,
|
||
|
|
prompt=prompt, upgrade_deps=upgrade_deps)
|
||
|
|
builder.create(env_dir)
|
||
|
|
|
||
|
|
def main(args=None):
|
||
|
|
compatible = True
|
||
|
|
if sys.version_info < (3, 3):
|
||
|
|
compatible = False
|
||
|
|
elif not hasattr(sys, 'base_prefix'):
|
||
|
|
compatible = False
|
||
|
|
if not compatible:
|
||
|
|
raise ValueError('This script is only for use with Python >= 3.3')
|
||
|
|
else:
|
||
|
|
import argparse
|
||
|
|
|
||
|
|
parser = argparse.ArgumentParser(prog=__name__,
|
||
|
|
description='Creates virtual Python '
|
||
|
|
'environments in one or '
|
||
|
|
'more target '
|
||
|
|
'directories.',
|
||
|
|
epilog='Once an environment has been '
|
||
|
|
'created, you may wish to '
|
||
|
|
'activate it, e.g. by '
|
||
|
|
'sourcing an activate script '
|
||
|
|
'in its bin directory.')
|
||
|
|
parser.add_argument('dirs', metavar='ENV_DIR', nargs='+',
|
||
|
|
help='A directory to create the environment in.')
|
||
|
|
parser.add_argument('--system-site-packages', default=False,
|
||
|
|
action='store_true', dest='system_site',
|
||
|
|
help='Give the virtual environment access to the '
|
||
|
|
'system site-packages dir.')
|
||
|
|
if os.name == 'nt':
|
||
|
|
use_symlinks = False
|
||
|
|
else:
|
||
|
|
use_symlinks = True
|
||
|
|
group = parser.add_mutually_exclusive_group()
|
||
|
|
group.add_argument('--symlinks', default=use_symlinks,
|
||
|
|
action='store_true', dest='symlinks',
|
||
|
|
help='Try to use symlinks rather than copies, '
|
||
|
|
'when symlinks are not the default for '
|
||
|
|
'the platform.')
|
||
|
|
group.add_argument('--copies', default=not use_symlinks,
|
||
|
|
action='store_false', dest='symlinks',
|
||
|
|
help='Try to use copies rather than symlinks, '
|
||
|
|
'even when symlinks are the default for '
|
||
|
|
'the platform.')
|
||
|
|
parser.add_argument('--clear', default=False, action='store_true',
|
||
|
|
dest='clear', help='Delete the contents of the '
|
||
|
|
'environment directory if it '
|
||
|
|
'already exists, before '
|
||
|
|
'environment creation.')
|
||
|
|
parser.add_argument('--upgrade', default=False, action='store_true',
|
||
|
|
dest='upgrade', help='Upgrade the environment '
|
||
|
|
'directory to use this version '
|
||
|
|
'of Python, assuming Python '
|
||
|
|
'has been upgraded in-place.')
|
||
|
|
parser.add_argument('--without-pip', dest='with_pip',
|
||
|
|
default=True, action='store_false',
|
||
|
|
help='Skips installing or upgrading pip in the '
|
||
|
|
'virtual environment (pip is bootstrapped '
|
||
|
|
'by default)')
|
||
|
|
parser.add_argument('--prompt',
|
||
|
|
help='Provides an alternative prompt prefix for '
|
||
|
|
'this environment.')
|
||
|
|
parser.add_argument('--upgrade-deps', default=False, action='store_true',
|
||
|
|
dest='upgrade_deps',
|
||
|
|
help='Upgrade core dependencies: {} to the latest '
|
||
|
|
'version in PyPI'.format(
|
||
|
|
' '.join(CORE_VENV_DEPS)))
|
||
|
|
options = parser.parse_args(args)
|
||
|
|
if options.upgrade and options.clear:
|
||
|
|
raise ValueError('you cannot supply --upgrade and --clear together.')
|
||
|
|
builder = EnvBuilder(system_site_packages=options.system_site,
|
||
|
|
clear=options.clear,
|
||
|
|
symlinks=options.symlinks,
|
||
|
|
upgrade=options.upgrade,
|
||
|
|
with_pip=options.with_pip,
|
||
|
|
prompt=options.prompt,
|
||
|
|
upgrade_deps=options.upgrade_deps)
|
||
|
|
for d in options.dirs:
|
||
|
|
builder.create(d)
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
rc = 1
|
||
|
|
try:
|
||
|
|
main()
|
||
|
|
rc = 0
|
||
|
|
except Exception as e:
|
||
|
|
print('Error: %s' % e, file=sys.stderr)
|
||
|
|
sys.exit(rc)
|