mirror of
https://github.com/python/cpython.git
synced 2025-10-29 04:35:05 +00:00
425 lines
18 KiB
Python
425 lines
18 KiB
Python
"""
|
|
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
|
|
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:
|
|
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'):
|
|
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 create(env_dir, system_site_packages=False, clear=False,
|
|
symlinks=False, with_pip=False, prompt=None):
|
|
"""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)
|
|
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.')
|
|
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)
|
|
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)
|