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"""
The PythonInfo contains information about a concrete instance of a Python interpreter.
Note: this file is also used to query target interpreters, so can only use standard library methods
"""
from __future__ import annotations
import json
import logging
import os
import platform
import re
import sys
import sysconfig
import warnings
from collections import OrderedDict, namedtuple
from string import digits
VersionInfo = namedtuple("VersionInfo", ["major", "minor", "micro", "releaselevel", "serial"]) # noqa: PYI024
def _get_path_extensions():
return list(OrderedDict.fromkeys(["", *os.environ.get("PATHEXT", "").lower().split(os.pathsep)]))
EXTENSIONS = _get_path_extensions()
_CONF_VAR_RE = re.compile(r"\{\w+\}")
class PythonInfo: # noqa: PLR0904
"""Contains information for a Python interpreter."""
def __init__(self) -> None: # noqa: PLR0915
def abs_path(v):
return None if v is None else os.path.abspath(v) # unroll relative elements from path (e.g. ..)
# qualifies the python
self.platform = sys.platform
self.implementation = platform.python_implementation()
if self.implementation == "PyPy":
self.pypy_version_info = tuple(sys.pypy_version_info)
# this is a tuple in earlier, struct later, unify to our own named tuple
self.version_info = VersionInfo(*sys.version_info)
self.architecture = 64 if sys.maxsize > 2**32 else 32
# Used to determine some file names.
# See `CPython3Windows.python_zip()`.
self.version_nodot = sysconfig.get_config_var("py_version_nodot")
self.version = sys.version
self.os = os.name
# information about the prefix - determines python home
self.prefix = abs_path(getattr(sys, "prefix", None)) # prefix we think
self.base_prefix = abs_path(getattr(sys, "base_prefix", None)) # venv
self.real_prefix = abs_path(getattr(sys, "real_prefix", None)) # old virtualenv
# information about the exec prefix - dynamic stdlib modules
self.base_exec_prefix = abs_path(getattr(sys, "base_exec_prefix", None))
self.exec_prefix = abs_path(getattr(sys, "exec_prefix", None))
self.executable = abs_path(sys.executable) # the executable we were invoked via
self.original_executable = abs_path(self.executable) # the executable as known by the interpreter
self.system_executable = self._fast_get_system_executable() # the executable we are based of (if available)
try:
__import__("venv")
has = True
except ImportError:
has = False
self.has_venv = has
self.path = sys.path
self.file_system_encoding = sys.getfilesystemencoding()
self.stdout_encoding = getattr(sys.stdout, "encoding", None)
scheme_names = sysconfig.get_scheme_names()
if "venv" in scheme_names:
self.sysconfig_scheme = "venv"
self.sysconfig_paths = {
i: sysconfig.get_path(i, expand=False, scheme=self.sysconfig_scheme) for i in sysconfig.get_path_names()
}
# we cannot use distutils at all if "venv" exists, distutils don't know it
self.distutils_install = {}
# debian / ubuntu python 3.10 without `python3-distutils` will report
# mangled `local/bin` / etc. names for the default prefix
# intentionally select `posix_prefix` which is the unaltered posix-like paths
elif sys.version_info[:2] == (3, 10) and "deb_system" in scheme_names:
self.sysconfig_scheme = "posix_prefix"
self.sysconfig_paths = {
i: sysconfig.get_path(i, expand=False, scheme=self.sysconfig_scheme) for i in sysconfig.get_path_names()
}
# we cannot use distutils at all if "venv" exists, distutils don't know it
self.distutils_install = {}
else:
self.sysconfig_scheme = None
self.sysconfig_paths = {i: sysconfig.get_path(i, expand=False) for i in sysconfig.get_path_names()}
self.distutils_install = self._distutils_install().copy()
# https://bugs.python.org/issue22199
makefile = getattr(sysconfig, "get_makefile_filename", getattr(sysconfig, "_get_makefile_filename", None))
self.sysconfig = {
k: v
for k, v in [
# a list of content to store from sysconfig
("makefile_filename", makefile()),
]
if k is not None
}
config_var_keys = set()
for element in self.sysconfig_paths.values():
for k in _CONF_VAR_RE.findall(element):
config_var_keys.add(k[1:-1])
config_var_keys.add("PYTHONFRAMEWORK")
self.sysconfig_vars = {i: sysconfig.get_config_var(i or "") for i in config_var_keys}
confs = {
k: (self.system_prefix if v is not None and v.startswith(self.prefix) else v)
for k, v in self.sysconfig_vars.items()
}
self.system_stdlib = self.sysconfig_path("stdlib", confs)
self.system_stdlib_platform = self.sysconfig_path("platstdlib", confs)
self.max_size = getattr(sys, "maxsize", getattr(sys, "maxint", None))
self._creators = None
def _fast_get_system_executable(self):
"""Try to get the system executable by just looking at properties."""
if self.real_prefix or ( # noqa: PLR1702
self.base_prefix is not None and self.base_prefix != self.prefix
): # if this is a virtual environment
if self.real_prefix is None:
base_executable = getattr(sys, "_base_executable", None) # some platforms may set this to help us
if base_executable is not None: # noqa: SIM102 # use the saved system executable if present
if sys.executable != base_executable: # we know we're in a virtual environment, cannot be us
if os.path.exists(base_executable):
return base_executable
# Python may return "python" because it was invoked from the POSIX virtual environment
# however some installs/distributions do not provide a version-less "python" binary in
# the system install location (see PEP 394) so try to fallback to a versioned binary.
#
# Gate this to Python 3.11 as `sys._base_executable` path resolution is now relative to
# the 'home' key from pyvenv.cfg which often points to the system install location.
major, minor = self.version_info.major, self.version_info.minor
if self.os == "posix" and (major, minor) >= (3, 11):
# search relative to the directory of sys._base_executable
base_dir = os.path.dirname(base_executable)
for base_executable in [
os.path.join(base_dir, exe) for exe in (f"python{major}", f"python{major}.{minor}")
]:
if os.path.exists(base_executable):
return base_executable
return None # in this case we just can't tell easily without poking around FS and calling them, bail
# if we're not in a virtual environment, this is already a system python, so return the original executable
# note we must choose the original and not the pure executable as shim scripts might throw us off
return self.original_executable
def install_path(self, key):
result = self.distutils_install.get(key)
if result is None: # use sysconfig if sysconfig_scheme is set or distutils is unavailable
# set prefixes to empty => result is relative from cwd
prefixes = self.prefix, self.exec_prefix, self.base_prefix, self.base_exec_prefix
config_var = {k: "" if v in prefixes else v for k, v in self.sysconfig_vars.items()}
result = self.sysconfig_path(key, config_var=config_var).lstrip(os.sep)
return result
@staticmethod
def _distutils_install():
# use distutils primarily because that's what pip does
# https://github.com/pypa/pip/blob/main/src/pip/_internal/locations.py#L95
# note here we don't import Distribution directly to allow setuptools to patch it
with warnings.catch_warnings(): # disable warning for PEP-632
warnings.simplefilter("ignore")
try:
from distutils import dist # noqa: PLC0415
from distutils.command.install import SCHEME_KEYS # noqa: PLC0415
except ImportError: # if removed or not installed ignore
return {}
d = dist.Distribution({"script_args": "--no-user-cfg"}) # conf files not parsed so they do not hijack paths
if hasattr(sys, "_framework"):
sys._framework = None # disable macOS static paths for framework # noqa: SLF001
with warnings.catch_warnings(): # disable warning for PEP-632
warnings.simplefilter("ignore")
i = d.get_command_obj("install", create=True)
i.prefix = os.sep # paths generated are relative to prefix that contains the path sep, this makes it relative
i.finalize_options()
return {key: (getattr(i, f"install_{key}")[1:]).lstrip(os.sep) for key in SCHEME_KEYS}
@property
def version_str(self):
return ".".join(str(i) for i in self.version_info[0:3])
@property
def version_release_str(self):
return ".".join(str(i) for i in self.version_info[0:2])
@property
def python_name(self):
version_info = self.version_info
return f"python{version_info.major}.{version_info.minor}"
@property
def is_old_virtualenv(self):
return self.real_prefix is not None
@property
def is_venv(self):
return self.base_prefix is not None
def sysconfig_path(self, key, config_var=None, sep=os.sep):
pattern = self.sysconfig_paths[key]
if config_var is None:
config_var = self.sysconfig_vars
else:
base = self.sysconfig_vars.copy()
base.update(config_var)
config_var = base
return pattern.format(**config_var).replace("/", sep)
def creators(self, refresh=False): # noqa: FBT002
if self._creators is None or refresh is True:
from virtualenv.run.plugin.creators import CreatorSelector # noqa: PLC0415
self._creators = CreatorSelector.for_interpreter(self)
return self._creators
@property
def system_include(self):
path = self.sysconfig_path(
"include",
{
k: (self.system_prefix if v is not None and v.startswith(self.prefix) else v)
for k, v in self.sysconfig_vars.items()
},
)
if not os.path.exists(path): # some broken packaging don't respect the sysconfig, fallback to distutils path
# the pattern include the distribution name too at the end, remove that via the parent call
fallback = os.path.join(self.prefix, os.path.dirname(self.install_path("headers")))
if os.path.exists(fallback):
path = fallback
return path
@property
def system_prefix(self):
return self.real_prefix or self.base_prefix or self.prefix
@property
def system_exec_prefix(self):
return self.real_prefix or self.base_exec_prefix or self.exec_prefix
def __repr__(self) -> str:
return "{}({!r})".format(
self.__class__.__name__,
{k: v for k, v in self.__dict__.items() if not k.startswith("_")},
)
def __str__(self) -> str:
return "{}({})".format(
self.__class__.__name__,
", ".join(
f"{k}={v}"
for k, v in (
("spec", self.spec),
(
"system"
if self.system_executable is not None and self.system_executable != self.executable
else None,
self.system_executable,
),
(
"original"
if self.original_executable not in {self.system_executable, self.executable}
else None,
self.original_executable,
),
("exe", self.executable),
("platform", self.platform),
("version", repr(self.version)),
("encoding_fs_io", f"{self.file_system_encoding}-{self.stdout_encoding}"),
)
if k is not None
),
)
@property
def spec(self):
return "{}{}-{}".format(self.implementation, ".".join(str(i) for i in self.version_info), self.architecture)
@classmethod
def clear_cache(cls, app_data):
# this method is not used by itself, so here and called functions can import stuff locally
from virtualenv.discovery.cached_py_info import clear # noqa: PLC0415
clear(app_data)
cls._cache_exe_discovery.clear()
def satisfies(self, spec, impl_must_match): # noqa: C901
"""Check if a given specification can be satisfied by the this python interpreter instance."""
if spec.path:
if self.executable == os.path.abspath(spec.path):
return True # if the path is a our own executable path we're done
if not spec.is_abs:
# if path set, and is not our original executable name, this does not match
basename = os.path.basename(self.original_executable)
spec_path = spec.path
if sys.platform == "win32":
basename, suffix = os.path.splitext(basename)
if spec_path.endswith(suffix):
spec_path = spec_path[: -len(suffix)]
if basename != spec_path:
return False
if (
impl_must_match
and spec.implementation is not None
and spec.implementation.lower() != self.implementation.lower()
):
return False
if spec.architecture is not None and spec.architecture != self.architecture:
return False
for our, req in zip(self.version_info[0:3], (spec.major, spec.minor, spec.micro)):
if req is not None and our is not None and our != req:
return False
return True
_current_system = None
_current = None
@classmethod
def current(cls, app_data=None):
"""
This locates the current host interpreter information. This might be different than what we run into in case
the host python has been upgraded from underneath us.
""" # noqa: D205
if cls._current is None:
cls._current = cls.from_exe(sys.executable, app_data, raise_on_error=True, resolve_to_host=False)
return cls._current
@classmethod
def current_system(cls, app_data=None):
"""
This locates the current host interpreter information. This might be different than what we run into in case
the host python has been upgraded from underneath us.
""" # noqa: D205
if cls._current_system is None:
cls._current_system = cls.from_exe(sys.executable, app_data, raise_on_error=True, resolve_to_host=True)
return cls._current_system
def _to_json(self):
# don't save calculated paths, as these are non primitive types
return json.dumps(self._to_dict(), indent=2)
def _to_dict(self):
data = {var: (getattr(self, var) if var != "_creators" else None) for var in vars(self)}
data["version_info"] = data["version_info"]._asdict() # namedtuple to dictionary
return data
@classmethod
def from_exe( # noqa: PLR0913
cls,
exe,
app_data=None,
raise_on_error=True, # noqa: FBT002
ignore_cache=False, # noqa: FBT002
resolve_to_host=True, # noqa: FBT002
env=None,
):
"""Given a path to an executable get the python information."""
# this method is not used by itself, so here and called functions can import stuff locally
from virtualenv.discovery.cached_py_info import from_exe # noqa: PLC0415
env = os.environ if env is None else env
proposed = from_exe(cls, app_data, exe, env=env, raise_on_error=raise_on_error, ignore_cache=ignore_cache)
if isinstance(proposed, PythonInfo) and resolve_to_host:
try:
proposed = proposed._resolve_to_system(app_data, proposed) # noqa: SLF001
except Exception as exception: # noqa: BLE001
if raise_on_error:
raise
logging.info("ignore %s due cannot resolve system due to %r", proposed.original_executable, exception)
proposed = None
return proposed
@classmethod
def _from_json(cls, payload):
# the dictionary unroll here is to protect against pypy bug of interpreter crashing
raw = json.loads(payload)
return cls._from_dict(raw.copy())
@classmethod
def _from_dict(cls, data):
data["version_info"] = VersionInfo(**data["version_info"]) # restore this to a named tuple structure
result = cls()
result.__dict__ = data.copy()
return result
@classmethod
def _resolve_to_system(cls, app_data, target):
start_executable = target.executable
prefixes = OrderedDict()
while target.system_executable is None:
prefix = target.real_prefix or target.base_prefix or target.prefix
if prefix in prefixes:
if len(prefixes) == 1:
# if we're linking back to ourselves accept ourselves with a WARNING
logging.info("%r links back to itself via prefixes", target)
target.system_executable = target.executable
break
for at, (p, t) in enumerate(prefixes.items(), start=1):
logging.error("%d: prefix=%s, info=%r", at, p, t)
logging.error("%d: prefix=%s, info=%r", len(prefixes) + 1, prefix, target)
msg = "prefixes are causing a circle {}".format("|".join(prefixes.keys()))
raise RuntimeError(msg)
prefixes[prefix] = target
target = target.discover_exe(app_data, prefix=prefix, exact=False)
if target.executable != target.system_executable:
target = cls.from_exe(target.system_executable, app_data)
target.executable = start_executable
return target
_cache_exe_discovery = {} # noqa: RUF012
def discover_exe(self, app_data, prefix, exact=True, env=None): # noqa: FBT002
key = prefix, exact
if key in self._cache_exe_discovery and prefix:
logging.debug("discover exe from cache %s - exact %s: %r", prefix, exact, self._cache_exe_discovery[key])
return self._cache_exe_discovery[key]
logging.debug("discover exe for %s in %s", self, prefix)
# we don't know explicitly here, do some guess work - our executable name should tell
possible_names = self._find_possible_exe_names()
possible_folders = self._find_possible_folders(prefix)
discovered = []
env = os.environ if env is None else env
for folder in possible_folders:
for name in possible_names:
info = self._check_exe(app_data, folder, name, exact, discovered, env)
if info is not None:
self._cache_exe_discovery[key] = info
return info
if exact is False and discovered:
info = self._select_most_likely(discovered, self)
folders = os.pathsep.join(possible_folders)
self._cache_exe_discovery[key] = info
logging.debug("no exact match found, chosen most similar of %s within base folders %s", info, folders)
return info
msg = "failed to detect {} in {}".format("|".join(possible_names), os.pathsep.join(possible_folders))
raise RuntimeError(msg)
def _check_exe(self, app_data, folder, name, exact, discovered, env): # noqa: PLR0913
exe_path = os.path.join(folder, name)
if not os.path.exists(exe_path):
return None
info = self.from_exe(exe_path, app_data, resolve_to_host=False, raise_on_error=False, env=env)
if info is None: # ignore if for some reason we can't query
return None
for item in ["implementation", "architecture", "version_info"]:
found = getattr(info, item)
searched = getattr(self, item)
if found != searched:
if item == "version_info":
found, searched = ".".join(str(i) for i in found), ".".join(str(i) for i in searched)
executable = info.executable
logging.debug("refused interpreter %s because %s differs %s != %s", executable, item, found, searched)
if exact is False:
discovered.append(info)
break
else:
return info
return None
@staticmethod
def _select_most_likely(discovered, target):
# no exact match found, start relaxing our requirements then to facilitate system package upgrades that
# could cause this (when using copy strategy of the host python)
def sort_by(info):
# we need to setup some priority of traits, this is as follows:
# implementation, major, minor, micro, architecture, tag, serial
matches = [
info.implementation == target.implementation,
info.version_info.major == target.version_info.major,
info.version_info.minor == target.version_info.minor,
info.architecture == target.architecture,
info.version_info.micro == target.version_info.micro,
info.version_info.releaselevel == target.version_info.releaselevel,
info.version_info.serial == target.version_info.serial,
]
return sum((1 << pos if match else 0) for pos, match in enumerate(reversed(matches)))
sorted_discovered = sorted(discovered, key=sort_by, reverse=True) # sort by priority in decreasing order
return sorted_discovered[0]
def _find_possible_folders(self, inside_folder):
candidate_folder = OrderedDict()
executables = OrderedDict()
executables[os.path.realpath(self.executable)] = None
executables[self.executable] = None
executables[os.path.realpath(self.original_executable)] = None
executables[self.original_executable] = None
for exe in executables:
base = os.path.dirname(exe)
# following path pattern of the current
if base.startswith(self.prefix):
relative = base[len(self.prefix) :]
candidate_folder[f"{inside_folder}{relative}"] = None
# or at root level
candidate_folder[inside_folder] = None
return [i for i in candidate_folder if os.path.exists(i)]
def _find_possible_exe_names(self):
name_candidate = OrderedDict()
for name in self._possible_base():
for at in (3, 2, 1, 0):
version = ".".join(str(i) for i in self.version_info[:at])
for arch in [f"-{self.architecture}", ""]:
for ext in EXTENSIONS:
candidate = f"{name}{version}{arch}{ext}"
name_candidate[candidate] = None
return list(name_candidate.keys())
def _possible_base(self):
possible_base = OrderedDict()
basename = os.path.splitext(os.path.basename(self.executable))[0].rstrip(digits)
possible_base[basename] = None
possible_base[self.implementation] = None
# python is always the final option as in practice is used by multiple implementation as exe name
if "python" in possible_base:
del possible_base["python"]
possible_base["python"] = None
for base in possible_base:
lower = base.lower()
yield lower
from virtualenv.info import fs_is_case_sensitive # noqa: PLC0415
if fs_is_case_sensitive():
if base != lower:
yield base
upper = base.upper()
if upper != base:
yield upper
if __name__ == "__main__":
# dump a JSON representation of the current python
argv = sys.argv[1:]
if len(argv) >= 1:
start_cookie = argv[0]
argv = argv[1:]
else:
start_cookie = ""
if len(argv) >= 1:
end_cookie = argv[0]
argv = argv[1:]
else:
end_cookie = ""
sys.argv = sys.argv[:1] + argv
info = PythonInfo()._to_json() # noqa: SLF001
sys.stdout.write("".join((start_cookie[::-1], info, end_cookie[::-1])))
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