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import json
import logging
import os
import sys
from abc import ABCMeta, abstractmethod
from argparse import ArgumentTypeError
from ast import literal_eval
from collections import OrderedDict
from pathlib import Path
from virtualenv.discovery.cached_py_info import LogCmd
from virtualenv.util.path import safe_delete
from virtualenv.util.subprocess import run_cmd
from virtualenv.version import __version__
from .pyenv_cfg import PyEnvCfg
HERE = Path(os.path.abspath(__file__)).parent
DEBUG_SCRIPT = HERE / "debug.py"
class CreatorMeta:
def __init__(self):
self.error = None
class Creator(metaclass=ABCMeta):
"""A class that given a python Interpreter creates a virtual environment"""
def __init__(self, options, interpreter):
"""Construct a new virtual environment creator.
:param options: the CLI option as parsed from :meth:`add_parser_arguments`
:param interpreter: the interpreter to create virtual environment from
"""
self.interpreter = interpreter
self._debug = None
self.dest = Path(options.dest)
self.clear = options.clear
self.no_vcs_ignore = options.no_vcs_ignore
self.pyenv_cfg = PyEnvCfg.from_folder(self.dest)
self.app_data = options.app_data
self.env = options.env
def __repr__(self):
return f"{self.__class__.__name__}({', '.join(f'{k}={v}' for k, v in self._args())})"
def _args(self):
return [
("dest", str(self.dest)),
("clear", self.clear),
("no_vcs_ignore", self.no_vcs_ignore),
]
@classmethod
def can_create(cls, interpreter): # noqa: U100
"""Determine if we can create a virtual environment.
:param interpreter: the interpreter in question
:return: ``None`` if we can't create, any other object otherwise that will be forwarded to \
:meth:`add_parser_arguments`
"""
return True
@classmethod
def add_parser_arguments(cls, parser, interpreter, meta, app_data): # noqa: U100
"""Add CLI arguments for the creator.
:param parser: the CLI parser
:param app_data: the application data folder
:param interpreter: the interpreter we're asked to create virtual environment for
:param meta: value as returned by :meth:`can_create`
"""
parser.add_argument(
"dest",
help="directory to create virtualenv at",
type=cls.validate_dest,
)
parser.add_argument(
"--clear",
dest="clear",
action="store_true",
help="remove the destination directory if exist before starting (will overwrite files otherwise)",
default=False,
)
parser.add_argument(
"--no-vcs-ignore",
dest="no_vcs_ignore",
action="store_true",
help="don't create VCS ignore directive in the destination directory",
default=False,
)
@abstractmethod
def create(self):
"""Perform the virtual environment creation."""
raise NotImplementedError
@classmethod
def validate_dest(cls, raw_value):
"""No path separator in the path, valid chars and must be write-able"""
def non_write_able(dest, value):
common = Path(*os.path.commonprefix([value.parts, dest.parts]))
raise ArgumentTypeError(f"the destination {dest.relative_to(common)} is not write-able at {common}")
# the file system must be able to encode
# note in newer CPython this is always utf-8 https://www.python.org/dev/peps/pep-0529/
encoding = sys.getfilesystemencoding()
refused = OrderedDict()
kwargs = {"errors": "ignore"} if encoding != "mbcs" else {}
for char in str(raw_value):
try:
trip = char.encode(encoding, **kwargs).decode(encoding)
if trip == char:
continue
raise ValueError(trip)
except ValueError:
refused[char] = None
if refused:
bad = "".join(refused.keys())
msg = f"the file system codec ({encoding}) cannot handle characters {bad!r} within {raw_value!r}"
raise ArgumentTypeError(msg)
if os.pathsep in raw_value:
msg = f"destination {raw_value!r} must not contain the path separator ({os.pathsep})"
raise ArgumentTypeError(f"{msg} as this would break the activation scripts")
value = Path(raw_value)
if value.exists() and value.is_file():
raise ArgumentTypeError(f"the destination {value} already exists and is a file")
dest = Path(os.path.abspath(str(value))).resolve() # on Windows absolute does not imply resolve so use both
value = dest
while dest:
if dest.exists():
if os.access(str(dest), os.W_OK):
break
else:
non_write_able(dest, value)
base, _ = dest.parent, dest.name
if base == dest:
non_write_able(dest, value) # pragma: no cover
dest = base
return str(value)
def run(self):
if self.dest.exists() and self.clear:
logging.debug("delete %s", self.dest)
safe_delete(self.dest)
self.create()
self.set_pyenv_cfg()
if not self.no_vcs_ignore:
self.setup_ignore_vcs()
def set_pyenv_cfg(self):
self.pyenv_cfg.content = OrderedDict()
self.pyenv_cfg["home"] = os.path.dirname(os.path.abspath(self.interpreter.system_executable))
self.pyenv_cfg["implementation"] = self.interpreter.implementation
self.pyenv_cfg["version_info"] = ".".join(str(i) for i in self.interpreter.version_info)
self.pyenv_cfg["virtualenv"] = __version__
def setup_ignore_vcs(self):
"""Generate ignore instructions for version control systems."""
# mark this folder to be ignored by VCS, handle https://www.python.org/dev/peps/pep-0610/#registered-vcs
git_ignore = self.dest / ".gitignore"
if not git_ignore.exists():
git_ignore.write_text("# created by virtualenv automatically\n*\n", encoding="utf-8")
# Mercurial - does not support the .hgignore file inside a subdirectory directly, but only if included via the
# subinclude directive from root, at which point on might as well ignore the directory itself, see
# https://www.selenic.com/mercurial/hgignore.5.html for more details
# Bazaar - does not support ignore files in sub-directories, only at root level via .bzrignore
# Subversion - does not support ignore files, requires direct manipulation with the svn tool
@property
def debug(self):
"""
:return: debug information about the virtual environment (only valid after :meth:`create` has run)
"""
if self._debug is None and self.exe is not None:
self._debug = get_env_debug_info(self.exe, self.debug_script(), self.app_data, self.env)
return self._debug
@staticmethod
def debug_script():
return DEBUG_SCRIPT
def get_env_debug_info(env_exe, debug_script, app_data, env):
env = env.copy()
env.pop("PYTHONPATH", None)
with app_data.ensure_extracted(debug_script) as debug_script:
cmd = [str(env_exe), str(debug_script)]
logging.debug("debug via %r", LogCmd(cmd))
code, out, err = run_cmd(cmd)
try:
if code != 0:
if out:
result = literal_eval(out)
else:
if code == 2 and "file" in err:
# Re-raise FileNotFoundError from `run_cmd()`
raise OSError(err)
raise Exception(err)
else:
result = json.loads(out)
if err:
result["err"] = err
except Exception as exception:
return {"out": out, "err": err, "returncode": code, "exception": repr(exception)}
if "sys" in result and "path" in result["sys"]:
del result["sys"]["path"][0]
return result
__all__ = [
"Creator",
"CreatorMeta",
]