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# Copyright 2019 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.
import typing as T
import hashlib
import os
from pathlib import Path, PurePath, PureWindowsPath
from .. import mlog
from . import ExtensionModule
from . import ModuleReturnValue
from ..mesonlib import (
File,
FileOrString,
MesonException,
path_is_in_root,
)
from ..interpreterbase import FeatureNew, typed_pos_args, noKwargs, permittedKwargs
if T.TYPE_CHECKING:
from . import ModuleState
from ..interpreter import Interpreter
class FSModule(ExtensionModule):
def __init__(self, interpreter: 'Interpreter') -> None:
super().__init__(interpreter)
self.snippets.add('generate_dub_file')
def _absolute_dir(self, state: 'ModuleState', arg: str) -> Path:
"""
make an absolute path from a relative path, WITHOUT resolving symlinks
"""
return Path(state.source_root) / Path(state.subdir) / Path(arg).expanduser()
def _resolve_dir(self, state: 'ModuleState', arg: str) -> Path:
"""
resolves symlinks and makes absolute a directory relative to calling meson.build,
if not already absolute
"""
path = self._absolute_dir(state, arg)
try:
# accommodate unresolvable paths e.g. symlink loops
path = path.resolve()
except Exception:
# return the best we could do
pass
return path
def _check(self, check: str, state: 'ModuleState', args: T.Sequence[str]) -> ModuleReturnValue:
test_file = self._resolve_dir(state, args[0])
val = getattr(test_file, check)()
if isinstance(val, Path):
val = str(val)
return ModuleReturnValue(val, [])
@noKwargs
@FeatureNew('fs.expanduser', '0.54.0')
@typed_pos_args('fs.expanduser', str)
def expanduser(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
return ModuleReturnValue(str(Path(args[0]).expanduser()), [])
@noKwargs
@FeatureNew('fs.is_absolute', '0.54.0')
@typed_pos_args('fs.is_absolute', str)
def is_absolute(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
return ModuleReturnValue(PurePath(args[0]).is_absolute(), [])
@noKwargs
@FeatureNew('fs.as_posix', '0.54.0')
@typed_pos_args('fs.as_posix', str)
def as_posix(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
"""
this function assumes you are passing a Windows path, even if on a Unix-like system
and so ALL '\' are turned to '/', even if you meant to escape a character
"""
return ModuleReturnValue(PureWindowsPath(args[0]).as_posix(), [])
@noKwargs
@typed_pos_args('fs.exists', str)
def exists(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
return self._check('exists', state, args)
@noKwargs
@typed_pos_args('fs.is_symlink', str)
def is_symlink(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
return ModuleReturnValue(self._absolute_dir(state, args[0]).is_symlink(), [])
@noKwargs
@typed_pos_args('fs.is_file', str)
def is_file(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
return self._check('is_file', state, args)
@noKwargs
@typed_pos_args('fs.is_dir', str)
def is_dir(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
return self._check('is_dir', state, args)
@noKwargs
@typed_pos_args('fs.hash', str, str)
def hash(self, state: 'ModuleState', args: T.Tuple[str, str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
file = self._resolve_dir(state, args[0])
if not file.is_file():
raise MesonException('{} is not a file and therefore cannot be hashed'.format(file))
try:
h = hashlib.new(args[1])
except ValueError:
raise MesonException('hash algorithm {} is not available'.format(args[1]))
mlog.debug('computing {} sum of {} size {} bytes'.format(args[1], file, file.stat().st_size))
h.update(file.read_bytes())
return ModuleReturnValue(h.hexdigest(), [])
@noKwargs
@typed_pos_args('fs.size', str)
def size(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
file = self._resolve_dir(state, args[0])
if not file.is_file():
raise MesonException('{} is not a file and therefore cannot be sized'.format(file))
try:
return ModuleReturnValue(file.stat().st_size, [])
except ValueError:
raise MesonException('{} size could not be determined'.format(args[0]))
@noKwargs
@typed_pos_args('fs.is_samepath', str, str)
def is_samepath(self, state: 'ModuleState', args: T.Tuple[str, str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
file1 = self._resolve_dir(state, args[0])
file2 = self._resolve_dir(state, args[1])
if not file1.exists():
return ModuleReturnValue(False, [])
if not file2.exists():
return ModuleReturnValue(False, [])
try:
return ModuleReturnValue(file1.samefile(file2), [])
except OSError:
return ModuleReturnValue(False, [])
@noKwargs
@typed_pos_args('fs.replace_suffix', str, str)
def replace_suffix(self, state: 'ModuleState', args: T.Tuple[str, str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
original = PurePath(args[0])
new = original.with_suffix(args[1])
return ModuleReturnValue(str(new), [])
@noKwargs
@typed_pos_args('fs.parent', str)
def parent(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
original = PurePath(args[0])
new = original.parent
return ModuleReturnValue(str(new), [])
@noKwargs
@typed_pos_args('fs.name', str)
def name(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
original = PurePath(args[0])
new = original.name
return ModuleReturnValue(str(new), [])
@noKwargs
@typed_pos_args('fs.stem', str)
@FeatureNew('fs.stem', '0.54.0')
def stem(self, state: 'ModuleState', args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
original = PurePath(args[0])
new = original.stem
return ModuleReturnValue(str(new), [])
@FeatureNew('fs.read', '0.57.0')
@permittedKwargs({'encoding'})
@typed_pos_args('fs.read', (str, File))
def read(self, state: 'ModuleState', args: T.Tuple['FileOrString'], kwargs: T.Dict[str, T.Any]) -> ModuleReturnValue:
"""Read a file from the source tree and return its value as a decoded
string.
If the encoding is not specified, the file is assumed to be utf-8
encoded. Paths must be relative by default (to prevent accidents) and
are forbidden to be read from the build directory (to prevent build
loops)
"""
path = args[0]
encoding: str = kwargs.get('encoding', 'utf-8')
if not isinstance(encoding, str):
raise MesonException('`encoding` parameter must be a string')
src_dir = self.interpreter.environment.source_dir
sub_dir = self.interpreter.subdir
build_dir = self.interpreter.environment.get_build_dir()
if isinstance(path, File):
if path.is_built:
raise MesonException(
'fs.read_file does not accept built files() objects')
path = os.path.join(src_dir, path.relative_name())
else:
if sub_dir:
src_dir = os.path.join(src_dir, sub_dir)
path = os.path.join(src_dir, path)
path = os.path.abspath(path)
if path_is_in_root(Path(path), Path(build_dir), resolve=True):
raise MesonException('path must not be in the build tree')
try:
with open(path, 'r', encoding=encoding) as f:
data = f.read()
except UnicodeDecodeError:
raise MesonException(f'decoding failed for {path}')
# Reconfigure when this file changes as it can contain data used by any
# part of the build configuration (e.g. `project(..., version:
# fs.read_file('VERSION')` or `configure_file(...)`
self.interpreter.add_build_def_file(path)
return ModuleReturnValue(data, [])
def initialize(*args: T.Any, **kwargs: T.Any) -> FSModule:
return FSModule(*args, **kwargs)
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