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490 lines
21 KiB
Python
490 lines
21 KiB
Python
5 years ago
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"""
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The PythonInfo contains information about a concrete instance of a Python interpreter
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Note: this file is also used to query target interpreters, so can only use standard library methods
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"""
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from __future__ import absolute_import, print_function
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import json
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import logging
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import os
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import platform
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import re
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import sys
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import sysconfig
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from collections import OrderedDict, namedtuple
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from distutils import dist
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from distutils.command.install import SCHEME_KEYS
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from string import digits
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VersionInfo = namedtuple("VersionInfo", ["major", "minor", "micro", "releaselevel", "serial"])
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def _get_path_extensions():
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return list(OrderedDict.fromkeys([""] + os.environ.get("PATHEXT", "").lower().split(os.pathsep)))
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EXTENSIONS = _get_path_extensions()
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_CONF_VAR_RE = re.compile(r"\{\w+\}")
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class PythonInfo(object):
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"""Contains information for a Python interpreter"""
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def __init__(self):
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def u(v):
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return v.decode("utf-8") if isinstance(v, bytes) else v
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def abs_path(v):
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return None if v is None else os.path.abspath(v) # unroll relative elements from path (e.g. ..)
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# qualifies the python
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self.platform = u(sys.platform)
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self.implementation = u(platform.python_implementation())
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if self.implementation == "PyPy":
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self.pypy_version_info = tuple(u(i) for i in sys.pypy_version_info)
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# this is a tuple in earlier, struct later, unify to our own named tuple
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self.version_info = VersionInfo(*list(u(i) for i in sys.version_info))
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self.architecture = 64 if sys.maxsize > 2 ** 32 else 32
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self.version = u(sys.version)
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self.os = u(os.name)
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# information about the prefix - determines python home
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self.prefix = u(abs_path(getattr(sys, "prefix", None))) # prefix we think
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self.base_prefix = u(abs_path(getattr(sys, "base_prefix", None))) # venv
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self.real_prefix = u(abs_path(getattr(sys, "real_prefix", None))) # old virtualenv
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# information about the exec prefix - dynamic stdlib modules
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self.base_exec_prefix = u(abs_path(getattr(sys, "base_exec_prefix", None)))
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self.exec_prefix = u(abs_path(getattr(sys, "exec_prefix", None)))
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self.executable = u(abs_path(sys.executable)) # the executable we were invoked via
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self.original_executable = u(abs_path(self.executable)) # the executable as known by the interpreter
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self.system_executable = self._fast_get_system_executable() # the executable we are based of (if available)
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try:
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__import__("venv")
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has = True
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except ImportError:
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has = False
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self.has_venv = has
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self.path = [u(i) for i in sys.path]
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self.file_system_encoding = u(sys.getfilesystemencoding())
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self.stdout_encoding = u(getattr(sys.stdout, "encoding", None))
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self.sysconfig_paths = {u(i): u(sysconfig.get_path(i, expand=False)) for i in sysconfig.get_path_names()}
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# https://bugs.python.org/issue22199
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makefile = getattr(sysconfig, "get_makefile_filename", getattr(sysconfig, "_get_makefile_filename", None))
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self.sysconfig = {
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u(k): u(v)
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for k, v in [
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# a list of content to store from sysconfig
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("makefile_filename", makefile()),
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]
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if k is not None
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}
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config_var_keys = set()
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for element in self.sysconfig_paths.values():
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for k in _CONF_VAR_RE.findall(element):
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config_var_keys.add(u(k[1:-1]))
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config_var_keys.add("PYTHONFRAMEWORK")
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self.sysconfig_vars = {u(i): u(sysconfig.get_config_var(i) or "") for i in config_var_keys}
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if self.implementation == "PyPy" and sys.version_info.major == 2:
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self.sysconfig_vars[u"implementation_lower"] = u"python"
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self.distutils_install = {u(k): u(v) for k, v in self._distutils_install().items()}
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confs = {k: (self.system_prefix if v.startswith(self.prefix) else v) for k, v in self.sysconfig_vars.items()}
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self.system_stdlib = self.sysconfig_path("stdlib", confs)
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self.system_stdlib_platform = self.sysconfig_path("platstdlib", confs)
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self.max_size = getattr(sys, "maxsize", getattr(sys, "maxint", None))
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self._creators = None
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def _fast_get_system_executable(self):
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"""Try to get the system executable by just looking at properties"""
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if self.real_prefix or (
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self.base_prefix is not None and self.base_prefix != self.prefix
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): # if this is a virtual environment
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if self.real_prefix is None:
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base_executable = getattr(sys, "_base_executable", None) # some platforms may set this to help us
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if base_executable is not None: # use the saved system executable if present
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if sys.executable != base_executable: # we know we're in a virtual environment, cannot be us
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return base_executable
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return None # in this case we just can't tell easily without poking around FS and calling them, bail
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# if we're not in a virtual environment, this is already a system python, so return the original executable
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# note we must choose the original and not the pure executable as shim scripts might throw us off
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return self.original_executable
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@staticmethod
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def _distutils_install():
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# follow https://github.com/pypa/pip/blob/master/src/pip/_internal/locations.py#L95
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# note here we don't import Distribution directly to allow setuptools to patch it
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d = dist.Distribution({"script_args": "--no-user-cfg"}) # conf files not parsed so they do not hijack paths
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if hasattr(sys, "_framework"):
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sys._framework = None # disable macOS static paths for framework
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i = d.get_command_obj("install", create=True)
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i.prefix = os.sep # paths generated are relative to prefix that contains the path sep, this makes it relative
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i.finalize_options()
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result = {key: (getattr(i, "install_{}".format(key))[1:]).lstrip(os.sep) for key in SCHEME_KEYS}
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return result
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@property
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def version_str(self):
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return ".".join(str(i) for i in self.version_info[0:3])
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@property
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def version_release_str(self):
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return ".".join(str(i) for i in self.version_info[0:2])
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@property
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def python_name(self):
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version_info = self.version_info
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return "python{}.{}".format(version_info.major, version_info.minor)
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@property
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def is_old_virtualenv(self):
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return self.real_prefix is not None
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@property
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def is_venv(self):
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return self.base_prefix is not None and self.version_info.major == 3
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def sysconfig_path(self, key, config_var=None, sep=os.sep):
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pattern = self.sysconfig_paths[key]
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if config_var is None:
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config_var = self.sysconfig_vars
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else:
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base = {k: v for k, v in self.sysconfig_vars.items()}
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base.update(config_var)
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config_var = base
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return pattern.format(**config_var).replace(u"/", sep)
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def creators(self, refresh=False):
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if self._creators is None or refresh is True:
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from virtualenv.run.plugin.creators import CreatorSelector
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self._creators = CreatorSelector.for_interpreter(self)
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return self._creators
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@property
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def system_include(self):
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path = self.sysconfig_path(
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"include",
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{k: (self.system_prefix if v.startswith(self.prefix) else v) for k, v in self.sysconfig_vars.items()},
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)
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if not os.path.exists(path): # some broken packaging don't respect the sysconfig, fallback to distutils path
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# the pattern include the distribution name too at the end, remove that via the parent call
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fallback = os.path.join(self.prefix, os.path.dirname(self.distutils_install["headers"]))
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if os.path.exists(fallback):
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path = fallback
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return path
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@property
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def system_prefix(self):
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return self.real_prefix or self.base_prefix or self.prefix
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@property
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def system_exec_prefix(self):
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return self.real_prefix or self.base_exec_prefix or self.exec_prefix
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def __unicode__(self):
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content = repr(self)
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if sys.version_info == 2:
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content = content.decode("utf-8")
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return content
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def __repr__(self):
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return "{}({!r})".format(
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self.__class__.__name__, {k: v for k, v in self.__dict__.items() if not k.startswith("_")},
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)
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def __str__(self):
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content = "{}({})".format(
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self.__class__.__name__,
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", ".join(
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"{}={}".format(k, v)
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for k, v in (
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("spec", self.spec),
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(
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"system"
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if self.system_executable is not None and self.system_executable != self.executable
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else None,
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self.system_executable,
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),
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(
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"original"
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if (
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self.original_executable != self.system_executable
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and self.original_executable != self.executable
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)
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else None,
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self.original_executable,
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),
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("exe", self.executable),
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("platform", self.platform),
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("version", repr(self.version)),
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("encoding_fs_io", "{}-{}".format(self.file_system_encoding, self.stdout_encoding)),
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)
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if k is not None
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),
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)
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return content
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@property
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def spec(self):
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return "{}{}-{}".format(self.implementation, ".".join(str(i) for i in self.version_info), self.architecture)
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@classmethod
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def clear_cache(cls, app_data):
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# this method is not used by itself, so here and called functions can import stuff locally
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from virtualenv.discovery.cached_py_info import clear
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clear(app_data)
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cls._cache_exe_discovery.clear()
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def satisfies(self, spec, impl_must_match):
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"""check if a given specification can be satisfied by the this python interpreter instance"""
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if spec.path:
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if self.executable == os.path.abspath(spec.path):
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return True # if the path is a our own executable path we're done
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if not spec.is_abs:
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# if path set, and is not our original executable name, this does not match
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basename = os.path.basename(self.original_executable)
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spec_path = spec.path
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if sys.platform == "win32":
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basename, suffix = os.path.splitext(basename)
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if spec_path.endswith(suffix):
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spec_path = spec_path[: -len(suffix)]
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if basename != spec_path:
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return False
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if impl_must_match:
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if spec.implementation is not None and spec.implementation.lower() != self.implementation.lower():
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return False
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if spec.architecture is not None and spec.architecture != self.architecture:
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return False
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for our, req in zip(self.version_info[0:3], (spec.major, spec.minor, spec.micro)):
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if req is not None and our is not None and our != req:
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return False
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return True
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_current_system = None
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_current = None
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@classmethod
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def current(cls, app_data=None):
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"""
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This locates the current host interpreter information. This might be different than what we run into in case
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the host python has been upgraded from underneath us.
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"""
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if cls._current is None:
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cls._current = cls.from_exe(sys.executable, app_data, raise_on_error=True, resolve_to_host=False)
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return cls._current
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@classmethod
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def current_system(cls, app_data=None):
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"""
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This locates the current host interpreter information. This might be different than what we run into in case
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the host python has been upgraded from underneath us.
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"""
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if cls._current_system is None:
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cls._current_system = cls.from_exe(sys.executable, app_data, raise_on_error=True, resolve_to_host=True)
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return cls._current_system
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def _to_json(self):
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# don't save calculated paths, as these are non primitive types
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return json.dumps(self._to_dict(), indent=2)
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def _to_dict(self):
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data = {var: (getattr(self, var) if var not in ("_creators",) else None) for var in vars(self)}
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# noinspection PyProtectedMember
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data["version_info"] = data["version_info"]._asdict() # namedtuple to dictionary
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return data
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@classmethod
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def from_exe(cls, exe, app_data=None, raise_on_error=True, ignore_cache=False, resolve_to_host=True):
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"""Given a path to an executable get the python information"""
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# this method is not used by itself, so here and called functions can import stuff locally
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from virtualenv.discovery.cached_py_info import from_exe
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proposed = from_exe(cls, app_data, exe, raise_on_error=raise_on_error, ignore_cache=ignore_cache)
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# noinspection PyProtectedMember
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if isinstance(proposed, PythonInfo) and resolve_to_host:
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try:
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proposed = proposed._resolve_to_system(app_data, proposed)
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except Exception as exception:
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if raise_on_error:
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raise exception
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logging.info("ignore %s due cannot resolve system due to %r", proposed.original_executable, exception)
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proposed = None
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return proposed
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@classmethod
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def _from_json(cls, payload):
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# the dictionary unroll here is to protect against pypy bug of interpreter crashing
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raw = json.loads(payload)
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return cls._from_dict({k: v for k, v in raw.items()})
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@classmethod
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def _from_dict(cls, data):
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data["version_info"] = VersionInfo(**data["version_info"]) # restore this to a named tuple structure
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result = cls()
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result.__dict__ = {k: v for k, v in data.items()}
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return result
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@classmethod
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def _resolve_to_system(cls, app_data, target):
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start_executable = target.executable
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prefixes = OrderedDict()
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|
|
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)
|
||
|
|
raise RuntimeError("prefixes are causing a circle {}".format("|".join(prefixes.keys())))
|
||
|
|
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 = {}
|
||
|
|
|
||
|
|
def discover_exe(self, app_data, prefix, exact=True):
|
||
|
|
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 = []
|
||
|
|
for folder in possible_folders:
|
||
|
|
for name in possible_names:
|
||
|
|
info = self._check_exe(app_data, folder, name, exact, discovered)
|
||
|
|
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):
|
||
|
|
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)
|
||
|
|
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,
|
||
|
|
]
|
||
|
|
priority = sum((1 << pos if match else 0) for pos, match in enumerate(reversed(matches)))
|
||
|
|
return priority
|
||
|
|
|
||
|
|
sorted_discovered = sorted(discovered, key=sort_by, reverse=True) # sort by priority in decreasing order
|
||
|
|
most_likely = sorted_discovered[0]
|
||
|
|
return most_likely
|
||
|
|
|
||
|
|
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.keys():
|
||
|
|
base = os.path.dirname(exe)
|
||
|
|
# following path pattern of the current
|
||
|
|
if base.startswith(self.prefix):
|
||
|
|
relative = base[len(self.prefix) :]
|
||
|
|
candidate_folder["{}{}".format(inside_folder, relative)] = None
|
||
|
|
|
||
|
|
# or at root level
|
||
|
|
candidate_folder[inside_folder] = None
|
||
|
|
return list(i for i in candidate_folder.keys() 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 ["-{}".format(self.architecture), ""]:
|
||
|
|
for ext in EXTENSIONS:
|
||
|
|
candidate = "{}{}{}{}".format(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
|
||
|
|
|
||
|
|
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
|
||
|
|
# noinspection PyProtectedMember
|
||
|
|
print(PythonInfo()._to_json())
|