# Copyright 2018 The Meson development team # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # http://www.apache.org/licenses/LICENSE-2.0 # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from __future__ import annotations from pathlib import Path import functools import json import os import shutil import typing as T from . import ExtensionModule, ModuleInfo from .. import mesonlib from .. import mlog from ..coredata import UserFeatureOption from ..build import known_shmod_kwargs from ..dependencies import DependencyMethods, PkgConfigDependency, NotFoundDependency, SystemDependency, ExtraFrameworkDependency from ..dependencies.base import process_method_kw from ..dependencies.detect import get_dep_identifier from ..environment import detect_cpu_family from ..interpreter import ExternalProgramHolder, extract_required_kwarg, permitted_dependency_kwargs from ..interpreter import primitives as P_OBJ from ..interpreter.type_checking import NoneType, PRESERVE_PATH_KW from ..interpreterbase import ( noPosargs, noKwargs, permittedKwargs, ContainerTypeInfo, InvalidArguments, typed_pos_args, typed_kwargs, KwargInfo, FeatureNew, FeatureNewKwargs, disablerIfNotFound ) from ..mesonlib import MachineChoice from ..programs import ExternalProgram, NonExistingExternalProgram if T.TYPE_CHECKING: from typing_extensions import TypedDict from . import ModuleState from ..build import SharedModule, Data from ..dependencies import ExternalDependency, Dependency from ..dependencies.factory import DependencyGenerator from ..environment import Environment from ..interpreter import Interpreter from ..interpreter.kwargs import ExtractRequired from ..interpreterbase.interpreterbase import TYPE_var, TYPE_kwargs class PythonIntrospectionDict(TypedDict): install_paths: T.Dict[str, str] is_pypy: bool is_venv: bool link_libpython: bool sysconfig_paths: T.Dict[str, str] paths: T.Dict[str, str] platform: str suffix: str variables: T.Dict[str, str] version: str class PyInstallKw(TypedDict): pure: bool subdir: str install_tag: T.Optional[str] class FindInstallationKw(ExtractRequired): disabler: bool modules: T.List[str] _Base = ExternalDependency else: _Base = object mod_kwargs = {'subdir'} mod_kwargs.update(known_shmod_kwargs) mod_kwargs -= {'name_prefix', 'name_suffix'} class _PythonDependencyBase(_Base): def __init__(self, python_holder: 'PythonInstallation', embed: bool): self.name = 'python' # override the name from the "real" dependency lookup self.embed = embed self.version: str = python_holder.version self.platform = python_holder.platform self.variables = python_holder.variables self.paths = python_holder.paths self.link_libpython = python_holder.link_libpython self.info: T.Optional[T.Dict[str, str]] = None if mesonlib.version_compare(self.version, '>= 3.0'): self.major_version = 3 else: self.major_version = 2 class PythonPkgConfigDependency(PkgConfigDependency, _PythonDependencyBase): def __init__(self, name: str, environment: 'Environment', kwargs: T.Dict[str, T.Any], installation: 'PythonInstallation', libpc: bool = False): if libpc: mlog.debug(f'Searching for {name!r} via pkgconfig lookup in LIBPC') else: mlog.debug(f'Searching for {name!r} via fallback pkgconfig lookup in default paths') PkgConfigDependency.__init__(self, name, environment, kwargs) _PythonDependencyBase.__init__(self, installation, kwargs.get('embed', False)) if libpc and not self.is_found: mlog.debug(f'"python-{self.version}" could not be found in LIBPC, this is likely due to a relocated python installation') class PythonFrameworkDependency(ExtraFrameworkDependency, _PythonDependencyBase): def __init__(self, name: str, environment: 'Environment', kwargs: T.Dict[str, T.Any], installation: 'PythonInstallation'): ExtraFrameworkDependency.__init__(self, name, environment, kwargs) _PythonDependencyBase.__init__(self, installation, kwargs.get('embed', False)) class PythonSystemDependency(SystemDependency, _PythonDependencyBase): def __init__(self, name: str, environment: 'Environment', kwargs: T.Dict[str, T.Any], installation: 'PythonInstallation'): SystemDependency.__init__(self, name, environment, kwargs) _PythonDependencyBase.__init__(self, installation, kwargs.get('embed', False)) if mesonlib.is_windows(): self._find_libpy_windows(environment) else: self._find_libpy(installation, environment) def _find_libpy(self, python_holder: 'PythonInstallation', environment: 'Environment') -> None: if python_holder.is_pypy: if self.major_version == 3: libname = 'pypy3-c' else: libname = 'pypy-c' libdir = os.path.join(self.variables.get('base'), 'bin') libdirs = [libdir] else: libname = f'python{self.version}' if 'DEBUG_EXT' in self.variables: libname += self.variables['DEBUG_EXT'] if 'ABIFLAGS' in self.variables: libname += self.variables['ABIFLAGS'] libdirs = [] largs = self.clib_compiler.find_library(libname, environment, libdirs) if largs is not None: self.link_args = largs self.is_found = largs is not None or not self.link_libpython inc_paths = mesonlib.OrderedSet([ self.variables.get('INCLUDEPY'), self.paths.get('include'), self.paths.get('platinclude')]) self.compile_args += ['-I' + path for path in inc_paths if path] def _get_windows_python_arch(self) -> T.Optional[str]: if self.platform == 'mingw': pycc = self.variables.get('CC') if pycc.startswith('x86_64'): return '64' elif pycc.startswith(('i686', 'i386')): return '32' else: mlog.log(f'MinGW Python built with unknown CC {pycc!r}, please file a bug') return None elif self.platform == 'win32': return '32' elif self.platform in ('win64', 'win-amd64'): return '64' mlog.log(f'Unknown Windows Python platform {self.platform!r}') return None def _get_windows_link_args(self) -> T.Optional[T.List[str]]: if self.platform.startswith('win'): vernum = self.variables.get('py_version_nodot') verdot = self.variables.get('py_version_short') imp_lower = self.variables.get('implementation_lower', 'python') if self.static: libpath = Path('libs') / f'libpython{vernum}.a' else: comp = self.get_compiler() if comp.id == "gcc": if imp_lower == 'pypy' and verdot == '3.8': # The naming changed between 3.8 and 3.9 libpath = Path('libpypy3-c.dll') elif imp_lower == 'pypy': libpath = Path(f'libpypy{verdot}-c.dll') else: libpath = Path(f'python{vernum}.dll') else: libpath = Path('libs') / f'python{vernum}.lib' # base_prefix to allow for virtualenvs. lib = Path(self.variables.get('base_prefix')) / libpath elif self.platform == 'mingw': if self.static: libname = self.variables.get('LIBRARY') else: libname = self.variables.get('LDLIBRARY') lib = Path(self.variables.get('LIBDIR')) / libname else: raise mesonlib.MesonBugException( 'On a Windows path, but the OS doesn\'t appear to be Windows or MinGW.') if not lib.exists(): mlog.log('Could not find Python3 library {!r}'.format(str(lib))) return None return [str(lib)] def _find_libpy_windows(self, env: 'Environment') -> None: ''' Find python3 libraries on Windows and also verify that the arch matches what we are building for. ''' pyarch = self._get_windows_python_arch() if pyarch is None: self.is_found = False return arch = detect_cpu_family(env.coredata.compilers.host) if arch == 'x86': arch = '32' elif arch == 'x86_64': arch = '64' else: # We can't cross-compile Python 3 dependencies on Windows yet mlog.log(f'Unknown architecture {arch!r} for', mlog.bold(self.name)) self.is_found = False return # Pyarch ends in '32' or '64' if arch != pyarch: mlog.log('Need', mlog.bold(self.name), f'for {arch}-bit, but found {pyarch}-bit') self.is_found = False return # This can fail if the library is not found largs = self._get_windows_link_args() if largs is None: self.is_found = False return self.link_args = largs # Compile args inc_paths = mesonlib.OrderedSet([ self.variables.get('INCLUDEPY'), self.paths.get('include'), self.paths.get('platinclude')]) self.compile_args += ['-I' + path for path in inc_paths if path] # https://sourceforge.net/p/mingw-w64/mailman/message/30504611/ if pyarch == '64' and self.major_version == 2: self.compile_args += ['-DMS_WIN64'] self.is_found = True def python_factory(env: 'Environment', for_machine: 'MachineChoice', kwargs: T.Dict[str, T.Any], methods: T.List[DependencyMethods], installation: 'PythonInstallation') -> T.List['DependencyGenerator']: # We can't use the factory_methods decorator here, as we need to pass the # extra installation argument embed = kwargs.get('embed', False) candidates: T.List['DependencyGenerator'] = [] pkg_version = installation.variables.get('LDVERSION') or installation.version if DependencyMethods.PKGCONFIG in methods: pkg_libdir = installation.variables.get('LIBPC') pkg_embed = '-embed' if embed and mesonlib.version_compare(installation.version, '>=3.8') else '' pkg_name = f'python-{pkg_version}{pkg_embed}' # If python-X.Y.pc exists in LIBPC, we will try to use it def wrap_in_pythons_pc_dir(name: str, env: 'Environment', kwargs: T.Dict[str, T.Any], installation: 'PythonInstallation') -> 'ExternalDependency': if not pkg_libdir: # there is no LIBPC, so we can't search in it return NotFoundDependency('python', env) old_pkg_libdir = os.environ.pop('PKG_CONFIG_LIBDIR', None) old_pkg_path = os.environ.pop('PKG_CONFIG_PATH', None) os.environ['PKG_CONFIG_LIBDIR'] = pkg_libdir try: return PythonPkgConfigDependency(name, env, kwargs, installation, True) finally: def set_env(name, value): if value is not None: os.environ[name] = value elif name in os.environ: del os.environ[name] set_env('PKG_CONFIG_LIBDIR', old_pkg_libdir) set_env('PKG_CONFIG_PATH', old_pkg_path) candidates.append(functools.partial(wrap_in_pythons_pc_dir, pkg_name, env, kwargs, installation)) # We only need to check both, if a python install has a LIBPC. It might point to the wrong location, # e.g. relocated / cross compilation, but the presence of LIBPC indicates we should definitely look for something. if pkg_libdir is not None: candidates.append(functools.partial(PythonPkgConfigDependency, pkg_name, env, kwargs, installation)) if DependencyMethods.SYSTEM in methods: candidates.append(functools.partial(PythonSystemDependency, 'python', env, kwargs, installation)) if DependencyMethods.EXTRAFRAMEWORK in methods: nkwargs = kwargs.copy() if mesonlib.version_compare(pkg_version, '>= 3'): # There is a python in /System/Library/Frameworks, but that's python 2.x, # Python 3 will always be in /Library nkwargs['paths'] = ['/Library/Frameworks'] candidates.append(functools.partial(PythonFrameworkDependency, 'Python', env, nkwargs, installation)) return candidates INTROSPECT_COMMAND = '''\ import os.path import sysconfig import json import sys import distutils.command.install def get_distutils_paths(scheme=None, prefix=None): import distutils.dist distribution = distutils.dist.Distribution() install_cmd = distribution.get_command_obj('install') if prefix is not None: install_cmd.prefix = prefix if scheme: install_cmd.select_scheme(scheme) install_cmd.finalize_options() return { 'data': install_cmd.install_data, 'include': os.path.dirname(install_cmd.install_headers), 'platlib': install_cmd.install_platlib, 'purelib': install_cmd.install_purelib, 'scripts': install_cmd.install_scripts, } # On Debian derivatives, the Python interpreter shipped by the distribution uses # a custom install scheme, deb_system, for the system install, and changes the # default scheme to a custom one pointing to /usr/local and replacing # site-packages with dist-packages. # See https://github.com/mesonbuild/meson/issues/8739. # XXX: We should be using sysconfig, but Debian only patches distutils. if 'deb_system' in distutils.command.install.INSTALL_SCHEMES: paths = get_distutils_paths(scheme='deb_system') install_paths = get_distutils_paths(scheme='deb_system', prefix='') else: paths = sysconfig.get_paths() empty_vars = {'base': '', 'platbase': '', 'installed_base': ''} install_paths = sysconfig.get_paths(vars=empty_vars) def links_against_libpython(): from distutils.core import Distribution, Extension cmd = Distribution().get_command_obj('build_ext') cmd.ensure_finalized() return bool(cmd.get_libraries(Extension('dummy', []))) variables = sysconfig.get_config_vars() variables.update({'base_prefix': getattr(sys, 'base_prefix', sys.prefix)}) print(json.dumps({ 'variables': variables, 'paths': paths, 'sysconfig_paths': sysconfig.get_paths(), 'install_paths': install_paths, 'version': sysconfig.get_python_version(), 'platform': sysconfig.get_platform(), 'is_pypy': '__pypy__' in sys.builtin_module_names, 'is_venv': sys.prefix != variables['base_prefix'], 'link_libpython': links_against_libpython(), })) ''' class PythonExternalProgram(ExternalProgram): def __init__(self, name: str, command: T.Optional[T.List[str]] = None, ext_prog: T.Optional[ExternalProgram] = None): if ext_prog is None: super().__init__(name, command=command, silent=True) else: self.name = name self.command = ext_prog.command self.path = ext_prog.path # We want strong key values, so we always populate this with bogus data. # Otherwise to make the type checkers happy we'd have to do .get() for # everycall, even though we know that the introspection data will be # complete self.info: 'PythonIntrospectionDict' = { 'install_paths': {}, 'is_pypy': False, 'is_venv': False, 'link_libpython': False, 'sysconfig_paths': {}, 'paths': {}, 'platform': 'sentinal', 'variables': {}, 'version': '0.0', } def _check_version(self, version: str) -> bool: if self.name == 'python2': return mesonlib.version_compare(version, '< 3.0') elif self.name == 'python3': return mesonlib.version_compare(version, '>= 3.0') return True def sanity(self, state: T.Optional['ModuleState'] = None) -> bool: # Sanity check, we expect to have something that at least quacks in tune from tempfile import NamedTemporaryFile with NamedTemporaryFile(suffix='.py', delete=False, mode='w', encoding='utf-8') as tf: tmpfilename = tf.name tf.write(INTROSPECT_COMMAND) cmd = self.get_command() + [tmpfilename] p, stdout, stderr = mesonlib.Popen_safe(cmd) os.unlink(tmpfilename) try: info = json.loads(stdout) except json.JSONDecodeError: info = None mlog.debug('Could not introspect Python (%s): exit code %d' % (str(p.args), p.returncode)) mlog.debug('Program stdout:\n') mlog.debug(stdout) mlog.debug('Program stderr:\n') mlog.debug(stderr) if info is not None and self._check_version(info['version']): variables = info['variables'] info['suffix'] = variables.get('EXT_SUFFIX') or variables.get('SO') or variables.get('.so') self.info = T.cast('PythonIntrospectionDict', info) self.platlib = self._get_path(state, 'platlib') self.purelib = self._get_path(state, 'purelib') return True else: return False def _get_path(self, state: T.Optional['ModuleState'], key: str) -> None: rel_path = self.info['install_paths'][key][1:] if not state: # This happens only from run_project_tests.py return rel_path value = state.get_option(f'{key}dir', module='python') if value: if state.is_user_defined_option('install_env', module='python'): raise mesonlib.MesonException(f'python.{key}dir and python.install_env are mutually exclusive') return value install_env = state.get_option('install_env', module='python') if install_env == 'auto': install_env = 'venv' if self.info['is_venv'] else 'system' if install_env == 'system': rel_path = os.path.join(self.info['variables']['prefix'], rel_path) elif install_env == 'venv': if not self.info['is_venv']: raise mesonlib.MesonException('python.install_env cannot be set to "venv" unless you are in a venv!') # inside a venv, deb_system is *never* active hence info['paths'] may be wrong rel_path = self.info['sysconfig_paths'][key] return rel_path _PURE_KW = KwargInfo('pure', bool, default=True) _SUBDIR_KW = KwargInfo('subdir', str, default='') class PythonInstallation(ExternalProgramHolder): def __init__(self, python: 'PythonExternalProgram', interpreter: 'Interpreter'): ExternalProgramHolder.__init__(self, python, interpreter) info = python.info prefix = self.interpreter.environment.coredata.get_option(mesonlib.OptionKey('prefix')) assert isinstance(prefix, str), 'for mypy' self.variables = info['variables'] self.suffix = info['suffix'] self.paths = info['paths'] self.platlib_install_path = os.path.join(prefix, python.platlib) self.purelib_install_path = os.path.join(prefix, python.purelib) self.version = info['version'] self.platform = info['platform'] self.is_pypy = info['is_pypy'] self.link_libpython = info['link_libpython'] self.methods.update({ 'extension_module': self.extension_module_method, 'dependency': self.dependency_method, 'install_sources': self.install_sources_method, 'get_install_dir': self.get_install_dir_method, 'language_version': self.language_version_method, 'found': self.found_method, 'has_path': self.has_path_method, 'get_path': self.get_path_method, 'has_variable': self.has_variable_method, 'get_variable': self.get_variable_method, 'path': self.path_method, }) @permittedKwargs(mod_kwargs) def extension_module_method(self, args: T.List['TYPE_var'], kwargs: 'TYPE_kwargs') -> 'SharedModule': if 'install_dir' in kwargs: if 'subdir' in kwargs: raise InvalidArguments('"subdir" and "install_dir" are mutually exclusive') else: subdir = kwargs.pop('subdir', '') if not isinstance(subdir, str): raise InvalidArguments('"subdir" argument must be a string.') kwargs['install_dir'] = self._get_install_dir_impl(False, subdir) new_deps = [] has_pydep = False for dep in mesonlib.extract_as_list(kwargs, 'dependencies'): if isinstance(dep, _PythonDependencyBase): has_pydep = True # On macOS and some Linux distros (Debian) distutils doesn't link # extensions against libpython. We call into distutils and mirror its # behavior. See https://github.com/mesonbuild/meson/issues/4117 if not self.link_libpython: dep = dep.get_partial_dependency(compile_args=True) new_deps.append(dep) if not has_pydep: pydep = self._dependency_method_impl({}) if not pydep.found(): raise mesonlib.MesonException('Python dependency not found') new_deps.append(pydep) FeatureNew.single_use('python_installation.extension_module with implicit dependency on python', '0.63.0', self.subproject, 'use python_installation.dependency()', self.current_node) kwargs['dependencies'] = new_deps # msys2's python3 has "-cpython-36m.dll", we have to be clever # FIXME: explain what the specific cleverness is here split, suffix = self.suffix.rsplit('.', 1) args[0] += split kwargs['name_prefix'] = '' kwargs['name_suffix'] = suffix if 'gnu_symbol_visibility' not in kwargs and \ (self.is_pypy or mesonlib.version_compare(self.version, '>=3.9')): kwargs['gnu_symbol_visibility'] = 'inlineshidden' return self.interpreter.func_shared_module(None, args, kwargs) def _dependency_method_impl(self, kwargs: TYPE_kwargs) -> Dependency: for_machine = self.interpreter.machine_from_native_kwarg(kwargs) identifier = get_dep_identifier(self._full_path(), kwargs) dep = self.interpreter.coredata.deps[for_machine].get(identifier) if dep is not None: return dep new_kwargs = kwargs.copy() new_kwargs['required'] = False methods = process_method_kw({DependencyMethods.PKGCONFIG, DependencyMethods.SYSTEM}, kwargs) # it's theoretically (though not practically) possible to not bind dep, let's ensure it is. dep: Dependency = NotFoundDependency('python', self.interpreter.environment) for d in python_factory(self.interpreter.environment, for_machine, new_kwargs, methods, self): dep = d() if dep.found(): break self.interpreter.coredata.deps[for_machine].put(identifier, dep) return dep @disablerIfNotFound @permittedKwargs(permitted_dependency_kwargs | {'embed'}) @FeatureNewKwargs('python_installation.dependency', '0.53.0', ['embed']) @noPosargs def dependency_method(self, args: T.List['TYPE_var'], kwargs: 'TYPE_kwargs') -> 'Dependency': disabled, required, feature = extract_required_kwarg(kwargs, self.subproject) if disabled: mlog.log('Dependency', mlog.bold('python'), 'skipped: feature', mlog.bold(feature), 'disabled') return NotFoundDependency('python', self.interpreter.environment) else: dep = self._dependency_method_impl(kwargs) if required and not dep.found(): raise mesonlib.MesonException('Python dependency not found') return dep @typed_pos_args('install_data', varargs=(str, mesonlib.File)) @typed_kwargs( 'python_installation.install_sources', _PURE_KW, _SUBDIR_KW, PRESERVE_PATH_KW, KwargInfo('install_tag', (str, NoneType), since='0.60.0') ) def install_sources_method(self, args: T.Tuple[T.List[T.Union[str, mesonlib.File]]], kwargs: 'PyInstallKw') -> 'Data': tag = kwargs['install_tag'] or 'runtime' install_dir = self._get_install_dir_impl(kwargs['pure'], kwargs['subdir']) return self.interpreter.install_data_impl( self.interpreter.source_strings_to_files(args[0]), install_dir, mesonlib.FileMode(), rename=None, tag=tag, install_data_type='python', install_dir_name=install_dir.optname, preserve_path=kwargs['preserve_path']) @noPosargs @typed_kwargs('python_installation.install_dir', _PURE_KW, _SUBDIR_KW) def get_install_dir_method(self, args: T.List['TYPE_var'], kwargs: 'PyInstallKw') -> str: return self._get_install_dir_impl(kwargs['pure'], kwargs['subdir']) def _get_install_dir_impl(self, pure: bool, subdir: str) -> P_OBJ.OptionString: if pure: base = self.purelib_install_path name = '{py_purelib}' else: base = self.platlib_install_path name = '{py_platlib}' return P_OBJ.OptionString(os.path.join(base, subdir), os.path.join(name, subdir)) @noPosargs @noKwargs def language_version_method(self, args: T.List['TYPE_var'], kwargs: 'TYPE_kwargs') -> str: return self.version @typed_pos_args('python_installation.has_path', str) @noKwargs def has_path_method(self, args: T.Tuple[str], kwargs: 'TYPE_kwargs') -> bool: return args[0] in self.paths @typed_pos_args('python_installation.get_path', str, optargs=[object]) @noKwargs def get_path_method(self, args: T.Tuple[str, T.Optional['TYPE_var']], kwargs: 'TYPE_kwargs') -> 'TYPE_var': path_name, fallback = args try: return self.paths[path_name] except KeyError: if fallback is not None: return fallback raise InvalidArguments(f'{path_name} is not a valid path name') @typed_pos_args('python_installation.has_variable', str) @noKwargs def has_variable_method(self, args: T.Tuple[str], kwargs: 'TYPE_kwargs') -> bool: return args[0] in self.variables @typed_pos_args('python_installation.get_variable', str, optargs=[object]) @noKwargs def get_variable_method(self, args: T.Tuple[str, T.Optional['TYPE_var']], kwargs: 'TYPE_kwargs') -> 'TYPE_var': var_name, fallback = args try: return self.variables[var_name] except KeyError: if fallback is not None: return fallback raise InvalidArguments(f'{var_name} is not a valid variable name') @noPosargs @noKwargs @FeatureNew('Python module path method', '0.50.0') def path_method(self, args: T.List['TYPE_var'], kwargs: 'TYPE_kwargs') -> str: return super().path_method(args, kwargs) class PythonModule(ExtensionModule): INFO = ModuleInfo('python', '0.46.0') def __init__(self, interpreter: 'Interpreter') -> None: super().__init__(interpreter) self.installations: T.Dict[str, ExternalProgram] = {} self.methods.update({ 'find_installation': self.find_installation, }) # https://www.python.org/dev/peps/pep-0397/ @staticmethod def _get_win_pythonpath(name_or_path: str) -> T.Optional[str]: if name_or_path not in ['python2', 'python3']: return None if not shutil.which('py'): # program not installed, return without an exception return None ver = {'python2': '-2', 'python3': '-3'}[name_or_path] cmd = ['py', ver, '-c', "import sysconfig; print(sysconfig.get_config_var('BINDIR'))"] _, stdout, _ = mesonlib.Popen_safe(cmd) directory = stdout.strip() if os.path.exists(directory): return os.path.join(directory, 'python') else: return None def _find_installation_impl(self, state: 'ModuleState', display_name: str, name_or_path: str, required: bool) -> ExternalProgram: if not name_or_path: python = PythonExternalProgram('python3', mesonlib.python_command) else: tmp_python = ExternalProgram.from_entry(display_name, name_or_path) python = PythonExternalProgram(display_name, ext_prog=tmp_python) if not python.found() and mesonlib.is_windows(): pythonpath = self._get_win_pythonpath(name_or_path) if pythonpath is not None: name_or_path = pythonpath python = PythonExternalProgram(name_or_path) # Last ditch effort, python2 or python3 can be named python # on various platforms, let's not give up just yet, if an executable # named python is available and has a compatible version, let's use # it if not python.found() and name_or_path in ['python2', 'python3']: python = PythonExternalProgram('python') if python.found(): if python.sanity(state): return python else: sanitymsg = f'{python} is not a valid python or it is missing distutils' if required: raise mesonlib.MesonException(sanitymsg) else: mlog.warning(sanitymsg, location=state.current_node) return NonExistingExternalProgram() @disablerIfNotFound @typed_pos_args('python.find_installation', optargs=[str]) @typed_kwargs( 'python.find_installation', KwargInfo('required', (bool, UserFeatureOption), default=True), KwargInfo('disabler', bool, default=False, since='0.49.0'), KwargInfo('modules', ContainerTypeInfo(list, str), listify=True, default=[], since='0.51.0'), ) def find_installation(self, state: 'ModuleState', args: T.Tuple[T.Optional[str]], kwargs: 'FindInstallationKw') -> ExternalProgram: feature_check = FeatureNew('Passing "feature" option to find_installation', '0.48.0') disabled, required, feature = extract_required_kwarg(kwargs, state.subproject, feature_check) # FIXME: this code is *full* of sharp corners. It assumes that it's # going to get a string value (or now a list of length 1), of `python2` # or `python3` which is completely nonsense. On windows the value could # easily be `['py', '-3']`, or `['py', '-3.7']` to get a very specific # version of python. On Linux we might want a python that's not in # $PATH, or that uses a wrapper of some kind. np: T.List[str] = state.environment.lookup_binary_entry(MachineChoice.HOST, 'python') or [] fallback = args[0] display_name = fallback or 'python' if not np and fallback is not None: np = [fallback] name_or_path = np[0] if np else None if disabled: mlog.log('Program', name_or_path or 'python', 'found:', mlog.red('NO'), '(disabled by:', mlog.bold(feature), ')') return NonExistingExternalProgram() python = self.installations.get(name_or_path) if not python: python = self._find_installation_impl(state, display_name, name_or_path, required) self.installations[name_or_path] = python want_modules = kwargs['modules'] found_modules: T.List[str] = [] missing_modules: T.List[str] = [] if python.found() and want_modules: for mod in want_modules: p, *_ = mesonlib.Popen_safe( python.command + ['-c', f'import {mod}']) if p.returncode != 0: missing_modules.append(mod) else: found_modules.append(mod) msg: T.List['mlog.TV_Loggable'] = ['Program', python.name] if want_modules: msg.append('({})'.format(', '.join(want_modules))) msg.append('found:') if python.found() and not missing_modules: msg.extend([mlog.green('YES'), '({})'.format(' '.join(python.command))]) else: msg.append(mlog.red('NO')) if found_modules: msg.append('modules:') msg.append(', '.join(found_modules)) mlog.log(*msg) if not python.found(): if required: raise mesonlib.MesonException('{} not found'.format(name_or_path or 'python')) return NonExistingExternalProgram() elif missing_modules: if required: raise mesonlib.MesonException('{} is missing modules: {}'.format(name_or_path or 'python', ', '.join(missing_modules))) return NonExistingExternalProgram() else: return python raise mesonlib.MesonBugException('Unreachable code was reached (PythonModule.find_installation).') def initialize(interpreter: 'Interpreter') -> PythonModule: mod = PythonModule(interpreter) mod.interpreter.append_holder_map(PythonExternalProgram, PythonInstallation) return mod