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# SPDX-License-Identifier: Apache-2.0
# Copyright 2019 The Meson development team
from __future__ import annotations
import subprocess as S
from threading import Thread
import typing as T
import re
import os
from .. import mlog
from ..mesonlib import PerMachine, Popen_safe, version_compare, is_windows
from ..options import OptionKey
from ..programs import find_external_program, NonExistingExternalProgram
if T.TYPE_CHECKING:
from pathlib import Path
from ..environment import Environment
from ..mesonlib import MachineChoice
from ..programs import ExternalProgram
TYPE_result = T.Tuple[int, T.Optional[str], T.Optional[str]]
TYPE_cache_key = T.Tuple[str, T.Tuple[str, ...], str, T.FrozenSet[T.Tuple[str, str]]]
class CMakeExecutor:
# The class's copy of the CMake path. Avoids having to search for it
# multiple times in the same Meson invocation.
class_cmakebin: PerMachine[T.Optional[ExternalProgram]] = PerMachine(None, None)
class_cmakevers: PerMachine[T.Optional[str]] = PerMachine(None, None)
class_cmake_cache: T.Dict[T.Any, TYPE_result] = {}
def __init__(self, environment: 'Environment', version: str, for_machine: MachineChoice, silent: bool = False):
self.min_version = version
self.environment = environment
self.for_machine = for_machine
self.cmakebin, self.cmakevers = self.find_cmake_binary(self.environment, silent=silent)
self.always_capture_stderr = True
self.print_cmout = False
self.prefix_paths: T.List[str] = []
self.extra_cmake_args: T.List[str] = []
if self.cmakebin is None:
return
if not version_compare(self.cmakevers, self.min_version):
mlog.warning(
'The version of CMake', mlog.bold(self.cmakebin.get_path()),
'is', mlog.bold(self.cmakevers), 'but version', mlog.bold(self.min_version),
'is required')
self.cmakebin = None
return
self.prefix_paths = self.environment.coredata.optstore.get_value(OptionKey('cmake_prefix_path', machine=self.for_machine))
if self.prefix_paths:
self.extra_cmake_args += ['-DCMAKE_PREFIX_PATH={}'.format(';'.join(self.prefix_paths))]
def find_cmake_binary(self, environment: 'Environment', silent: bool = False) -> T.Tuple[T.Optional['ExternalProgram'], T.Optional[str]]:
# Only search for CMake the first time and store the result in the class
# definition
if isinstance(CMakeExecutor.class_cmakebin[self.for_machine], NonExistingExternalProgram):
mlog.debug(f'CMake binary for {self.for_machine} is cached as not found')
return None, None
elif CMakeExecutor.class_cmakebin[self.for_machine] is not None:
mlog.debug(f'CMake binary for {self.for_machine} is cached.')
else:
assert CMakeExecutor.class_cmakebin[self.for_machine] is None
mlog.debug(f'CMake binary for {self.for_machine} is not cached')
for potential_cmakebin in find_external_program(
environment, self.for_machine, 'cmake', 'CMake',
environment.default_cmake, allow_default_for_cross=False):
version_if_ok = self.check_cmake(potential_cmakebin)
if not version_if_ok:
continue
if not silent:
mlog.log('Found CMake:', mlog.bold(potential_cmakebin.get_path()),
f'({version_if_ok})')
CMakeExecutor.class_cmakebin[self.for_machine] = potential_cmakebin
CMakeExecutor.class_cmakevers[self.for_machine] = version_if_ok
break
else:
if not silent:
mlog.log('Found CMake:', mlog.red('NO'))
# Set to False instead of None to signify that we've already
# searched for it and not found it
CMakeExecutor.class_cmakebin[self.for_machine] = NonExistingExternalProgram()
CMakeExecutor.class_cmakevers[self.for_machine] = None
return None, None
return CMakeExecutor.class_cmakebin[self.for_machine], CMakeExecutor.class_cmakevers[self.for_machine]
def check_cmake(self, cmakebin: 'ExternalProgram') -> T.Optional[str]:
if not cmakebin.found():
mlog.log(f'Did not find CMake {cmakebin.name!r}')
return None
try:
cmd = cmakebin.get_command()
p, out = Popen_safe(cmd + ['--version'])[0:2]
if p.returncode != 0:
mlog.warning('Found CMake {!r} but couldn\'t run it'
''.format(' '.join(cmd)))
return None
except FileNotFoundError:
mlog.warning('We thought we found CMake {!r} but now it\'s not there. How odd!'
''.format(' '.join(cmd)))
return None
except PermissionError:
msg = 'Found CMake {!r} but didn\'t have permissions to run it.'.format(' '.join(cmd))
if not is_windows():
msg += '\n\nOn Unix-like systems this is often caused by scripts that are not executable.'
mlog.warning(msg)
return None
cmvers = re.search(r'(cmake|cmake3)\s*version\s*([\d.]+)', out)
if cmvers is not None:
return cmvers.group(2)
mlog.warning(f'We thought we found CMake {cmd!r}, but it was missing the expected '
'version string in its output.')
return None
def set_exec_mode(self, print_cmout: T.Optional[bool] = None, always_capture_stderr: T.Optional[bool] = None) -> None:
if print_cmout is not None:
self.print_cmout = print_cmout
if always_capture_stderr is not None:
self.always_capture_stderr = always_capture_stderr
def _cache_key(self, args: T.List[str], build_dir: Path, env: T.Optional[T.Dict[str, str]]) -> TYPE_cache_key:
fenv = frozenset(env.items()) if env is not None else frozenset()
targs = tuple(args)
return (self.cmakebin.get_path(), targs, build_dir.as_posix(), fenv)
def _call_cmout_stderr(self, args: T.List[str], build_dir: Path, env: T.Optional[T.Dict[str, str]]) -> TYPE_result:
cmd = self.cmakebin.get_command() + args
proc = S.Popen(cmd, stdout=S.PIPE, stderr=S.PIPE, cwd=str(build_dir), env=env) # TODO [PYTHON_37]: drop Path conversion
# stdout and stderr MUST be read at the same time to avoid pipe
# blocking issues. The easiest way to do this is with a separate
# thread for one of the pipes.
def print_stdout() -> None:
while True:
line = proc.stdout.readline()
if not line:
break
mlog.log(line.decode(errors='ignore').strip('\n'))
proc.stdout.close()
t = Thread(target=print_stdout)
t.start()
try:
# Read stderr line by line and log non trace lines
raw_trace = ''
tline_start_reg = re.compile(r'^\s*(.*\.(cmake|txt))\(([0-9]+)\):\s*(\w+)\(.*$')
inside_multiline_trace = False
while True:
line_raw = proc.stderr.readline()
if not line_raw:
break
line = line_raw.decode(errors='ignore')
if tline_start_reg.match(line):
raw_trace += line
inside_multiline_trace = not line.endswith(' )\n')
elif inside_multiline_trace:
raw_trace += line
else:
mlog.warning(line.strip('\n'))
finally:
proc.stderr.close()
t.join()
proc.wait()
return proc.returncode, None, raw_trace
def _call_cmout(self, args: T.List[str], build_dir: Path, env: T.Optional[T.Dict[str, str]]) -> TYPE_result:
cmd = self.cmakebin.get_command() + args
proc = S.Popen(cmd, stdout=S.PIPE, stderr=S.STDOUT, cwd=str(build_dir), env=env) # TODO [PYTHON_37]: drop Path conversion
while True:
line = proc.stdout.readline()
if not line:
break
mlog.log(line.decode(errors='ignore').strip('\n'))
proc.stdout.close()
proc.wait()
return proc.returncode, None, None
def _call_quiet(self, args: T.List[str], build_dir: Path, env: T.Optional[T.Dict[str, str]]) -> TYPE_result:
build_dir.mkdir(parents=True, exist_ok=True)
cmd = self.cmakebin.get_command() + args
ret = S.run(cmd, env=env, cwd=str(build_dir), close_fds=False,
stdout=S.PIPE, stderr=S.PIPE, universal_newlines=False) # TODO [PYTHON_37]: drop Path conversion
rc = ret.returncode
out = ret.stdout.decode(errors='ignore')
err = ret.stderr.decode(errors='ignore')
return rc, out, err
def _call_impl(self, args: T.List[str], build_dir: Path, env: T.Optional[T.Dict[str, str]]) -> TYPE_result:
mlog.debug(f'Calling CMake ({self.cmakebin.get_command()}) in {build_dir} with:')
for i in args:
mlog.debug(f' - "{i}"')
if not self.print_cmout:
return self._call_quiet(args, build_dir, env)
else:
if self.always_capture_stderr:
return self._call_cmout_stderr(args, build_dir, env)
else:
return self._call_cmout(args, build_dir, env)
def call(self, args: T.List[str], build_dir: Path, env: T.Optional[T.Dict[str, str]] = None, disable_cache: bool = False) -> TYPE_result:
if env is None:
env = os.environ.copy()
args = args + self.extra_cmake_args
if disable_cache:
return self._call_impl(args, build_dir, env)
# First check if cached, if not call the real cmake function
cache = CMakeExecutor.class_cmake_cache
key = self._cache_key(args, build_dir, env)
if key not in cache:
cache[key] = self._call_impl(args, build_dir, env)
return cache[key]
def found(self) -> bool:
return self.cmakebin is not None
def version(self) -> str:
return self.cmakevers
def executable_path(self) -> str:
return self.cmakebin.get_path()
def get_command(self) -> T.List[str]:
return self.cmakebin.get_command()
def get_cmake_prefix_paths(self) -> T.List[str]:
return self.prefix_paths
def machine_choice(self) -> MachineChoice:
return self.for_machine
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