def _resolve_scheme(name):
os_name, sep, key = name.partition('_')
try:
resolved = sysconfig.get_preferred_scheme(key)
except Exception:
resolved = fw.scheme(_pypy_hack(name))
return resolved
def _infer_prefix() -> str:
"""Try to find a prefix scheme for the current platform.
This tries:
* A special ``osx_framework_library`` for Python distributed by Apple's
Command Line Tools, when not running in a virtual environment.
* Implementation + OS, used by PyPy on Windows (``pypy_nt``).
* Implementation without OS, used by PyPy on POSIX (``pypy``).
* OS + "prefix", used by CPython on POSIX (``posix_prefix``).
* Just the OS name, used by CPython on Windows (``nt``).
If none of the above works, fall back to ``posix_prefix``.
"""
if _HAS_PREFERRED_SCHEME_API:
return sysconfig.get_preferred_scheme("prefix") # type: ignore
os_framework_global = is_osx_framework() and not running_under_virtualenv()
if os_framework_global and "osx_framework_library" in _AVAILABLE_SCHEMES:
return "osx_framework_library"
implementation_suffixed = f"{sys.implementation.name}_{os.name}"
if implementation_suffixed in _AVAILABLE_SCHEMES:
return implementation_suffixed
if sys.implementation.name in _AVAILABLE_SCHEMES:
return sys.implementation.name
suffixed = f"{os.name}_prefix"
if suffixed in _AVAILABLE_SCHEMES:
return suffixed
if os.name in _AVAILABLE_SCHEMES: # On Windows, prefx is just called "nt".
return os.name
return "posix_prefix"
def select_scheme(self, name):
os_name, sep, key = name.partition('_')
try:
resolved = sysconfig.get_preferred_scheme(key)
except Exception:
resolved = self._pypy_hack(name)
return self._select_scheme(resolved)
def _infer_home() -> str:
"""Try to find a home for the current platform."""
if _HAS_PREFERRED_SCHEME_API:
return sysconfig.get_preferred_scheme("home") # type: ignore
suffixed = f"{os.name}_home"
if suffixed in _AVAILABLE_SCHEMES:
return suffixed
return "posix_home"
def test_custom_venv_install_scheme_is_prefered(mocker):
# The paths in this test are Fedora paths, but we set them for nt as well, so the test also works on Windows,
# despite the actual values are nonsense there.
# Values were simplified to be compatible with all the supported Python versions.
default_scheme = {
"stdlib": "{base}/lib/python{py_version_short}",
"platstdlib": "{platbase}/lib/python{py_version_short}",
"purelib": "{base}/local/lib/python{py_version_short}/site-packages",
"platlib": "{platbase}/local/lib/python{py_version_short}/site-packages",
"include": "{base}/include/python{py_version_short}",
"platinclude": "{platbase}/include/python{py_version_short}",
"scripts": "{base}/local/bin",
"data": "{base}/local",
}
venv_scheme = {key: path.replace("local", "") for key, path in default_scheme.items()}
sysconfig_install_schemes = {
"posix_prefix": default_scheme,
"nt": default_scheme,
"pypy": default_scheme,
"pypy_nt": default_scheme,
"venv": venv_scheme,
}
if getattr(sysconfig, "get_preferred_scheme", None):
sysconfig_install_schemes[sysconfig.get_preferred_scheme("prefix")] = default_scheme
if sys.version_info[0] == 2:
sysconfig_install_schemes = _stringify_schemes_dict(sysconfig_install_schemes)
# On Python < 3.10, the distutils schemes are not derived from sysconfig schemes
# So we mock them as well to assert the custom "venv" install scheme has priority
distutils_scheme = {
"purelib": "$base/local/lib/python$py_version_short/site-packages",
"platlib": "$platbase/local/lib/python$py_version_short/site-packages",
"headers": "$base/include/python$py_version_short/$dist_name",
"scripts": "$base/local/bin",
"data": "$base/local",
}
distutils_schemes = {
"unix_prefix": distutils_scheme,
"nt": distutils_scheme,
}
if sys.version_info[0] == 2:
distutils_schemes = _stringify_schemes_dict(distutils_schemes)
# We need to mock distutils first, so they don't see the mocked sysconfig,
# if imported for the first time.
# That can happen if the actual interpreter has the "venv" INSTALL_SCHEME
# and hence this is the first time we are touching distutils in this process.
# If distutils saw our mocked sysconfig INSTALL_SCHEMES, we would need
# to define all install schemes.
mocker.patch("distutils.command.install.INSTALL_SCHEMES", distutils_schemes)
mocker.patch("sysconfig._INSTALL_SCHEMES", sysconfig_install_schemes)
pyinfo = PythonInfo()
pyver = f"{pyinfo.version_info.major}.{pyinfo.version_info.minor}"
assert pyinfo.install_path("scripts") == "bin"
assert pyinfo.install_path("purelib").replace(os.sep, "/") == f"lib/python{pyver}/site-packages"
def _infer_user() -> str:
"""Try to find a user scheme for the current platform."""
if _HAS_PREFERRED_SCHEME_API:
return sysconfig.get_preferred_scheme("user") # type: ignore
if is_osx_framework() and not running_under_virtualenv():
suffixed = "osx_framework_user"
else:
suffixed = f"{os.name}_user"
if suffixed in _AVAILABLE_SCHEMES:
return suffixed
if "posix_user" not in _AVAILABLE_SCHEMES: # User scheme unavailable.
raise UserInstallationInvalid()
return "posix_user"