airflow/utils/file.py - airflow - Git at Google

 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file
 # distributed with this work for additional information
 # regarding copyright ownership.  The ASF licenses this file
 # to you 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 io
 import logging
 import os
 import re
 import zipfile
 from collections import OrderedDict
 from pathlib import Path
 from typing import TYPE_CHECKING, Dict, Generator, List, NamedTuple, Optional, Pattern, Type, Union, overload

 from pathspec.patterns import GitWildMatchPattern
 from typing_extensions import Protocol

 from airflow.configuration import conf

 if TYPE_CHECKING:
     import pathlib

 log = logging.getLogger(__name__)


 class _IgnoreRule(Protocol):
     """Interface for ignore rules for structural subtyping"""

     @staticmethod
     def compile(pattern: str, base_dir: Path, definition_file: Path) -> Optional['_IgnoreRule']:
         """
         Build an ignore rule from the supplied pattern where base_dir
         and definition_file should be absolute paths.
         """

     @staticmethod
     def match(path: Path, rules: List['_IgnoreRule']) -> bool:
         """Match a candidate absolute path against a list of rules"""


 class _RegexpIgnoreRule(NamedTuple):
     """Typed namedtuple with utility functions for regexp ignore rules"""

     pattern: Pattern
     base_dir: Path

     @staticmethod
     def compile(pattern: str, base_dir: Path, definition_file: Path) -> Optional[_IgnoreRule]:
         """Build an ignore rule from the supplied regexp pattern and log a useful warning if it is invalid"""
         try:
             return _RegexpIgnoreRule(re.compile(pattern), base_dir)
         except re.error as e:
             log.warning("Ignoring invalid regex '%s' from %s: %s", pattern, definition_file, e)
             return None

     @staticmethod
     def match(path: Path, rules: List[_IgnoreRule]) -> bool:
         """Match a list of ignore rules against the supplied path"""
         for rule in rules:
             if not isinstance(rule, _RegexpIgnoreRule):
                 raise ValueError(f"_RegexpIgnoreRule cannot match rules of type: {type(rule)}")
             if rule.pattern.search(str(path.relative_to(rule.base_dir))) is not None:
                 return True
         return False


 class _GlobIgnoreRule(NamedTuple):
     """Typed namedtuple with utility functions for glob ignore rules"""

     pattern: Pattern
     raw_pattern: str
     include: Optional[bool] = None
     relative_to: Optional[Path] = None

     @staticmethod
     def compile(pattern: str, _, definition_file: Path) -> Optional[_IgnoreRule]:
         """Build an ignore rule from the supplied glob pattern and log a useful warning if it is invalid"""
         relative_to: Optional[Path] = None
         if pattern.strip() == "/":
             # "/" doesn't match anything in gitignore
             log.warning("Ignoring no-op glob pattern '/' from %s", definition_file)
             return None
         if pattern.startswith("/") or "/" in pattern.rstrip("/"):
             # See https://git-scm.com/docs/gitignore
             # > If there is a separator at the beginning or middle (or both) of the pattern, then the
             # > pattern is relative to the directory level of the particular .gitignore file itself.
             # > Otherwise the pattern may also match at any level below the .gitignore level.
             relative_to = definition_file.parent
         ignore_pattern = GitWildMatchPattern(pattern)
         return _GlobIgnoreRule(ignore_pattern.regex, pattern, ignore_pattern.include, relative_to)

     @staticmethod
     def match(path: Path, rules: List[_IgnoreRule]) -> bool:
         """Match a list of ignore rules against the supplied path"""
         matched = False
         for r in rules:
             if not isinstance(r, _GlobIgnoreRule):
                 raise ValueError(f"_GlobIgnoreRule cannot match rules of type: {type(r)}")
             rule: _GlobIgnoreRule = r  # explicit typing to make mypy play nicely
             rel_path = str(path.relative_to(rule.relative_to) if rule.relative_to else path.name)
             if rule.raw_pattern.endswith("/") and path.is_dir():
                 # ensure the test path will potentially match a directory pattern if it is a directory
                 rel_path += "/"
             if rule.include is not None and rule.pattern.match(rel_path) is not None:
                 matched = rule.include
         return matched


 def TemporaryDirectory(*args, **kwargs):
     """This function is deprecated. Please use `tempfile.TemporaryDirectory`"""
     import warnings
     from tempfile import TemporaryDirectory as TmpDir

     warnings.warn(
         "This function is deprecated. Please use `tempfile.TemporaryDirectory`",
         DeprecationWarning,
         stacklevel=2,
     )

     return TmpDir(*args, **kwargs)


 def mkdirs(path, mode):
     """
     Creates the directory specified by path, creating intermediate directories
     as necessary. If directory already exists, this is a no-op.

     :param path: The directory to create
     :param mode: The mode to give to the directory e.g. 0o755, ignores umask
     """
     import warnings

     warnings.warn(
         f"This function is deprecated. Please use `pathlib.Path({path}).mkdir`",
         DeprecationWarning,
         stacklevel=2,
     )
     Path(path).mkdir(mode=mode, parents=True, exist_ok=True)


 ZIP_REGEX = re.compile(fr'((.*\.zip){re.escape(os.sep)})?(.*)')


 @overload
 def correct_maybe_zipped(fileloc: None) -> None:
     ...


 @overload
 def correct_maybe_zipped(fileloc: Union[str, Path]) -> Union[str, Path]:
     ...


 def correct_maybe_zipped(fileloc: Union[None, str, Path]) -> Union[None, str, Path]:
     """
     If the path contains a folder with a .zip suffix, then
     the folder is treated as a zip archive and path to zip is returned.
     """
     if not fileloc:
         return fileloc
     search_ = ZIP_REGEX.search(str(fileloc))
     if not search_:
         return fileloc
     _, archive, _ = search_.groups()
     if archive and zipfile.is_zipfile(archive):
         return archive
     else:
         return fileloc


 def open_maybe_zipped(fileloc, mode='r'):
     """
     Opens the given file. If the path contains a folder with a .zip suffix, then
     the folder is treated as a zip archive, opening the file inside the archive.

     :return: a file object, as in `open`, or as in `ZipFile.open`.
     """
     _, archive, filename = ZIP_REGEX.search(fileloc).groups()
     if archive and zipfile.is_zipfile(archive):
         return io.TextIOWrapper(zipfile.ZipFile(archive, mode=mode).open(filename))
     else:

         return open(fileloc, mode=mode)


 def _find_path_from_directory(
     base_dir_path: str,
     ignore_file_name: str,
     ignore_rule_type: Type[_IgnoreRule],
 ) -> Generator[str, None, None]:
     """
     Recursively search the base path and return the list of file paths that should not be ignored by
     regular expressions in any ignore files at each directory level.
     :param base_dir_path: the base path to be searched
     :param ignore_file_name: the file name containing regular expressions for files that should be ignored.
     :param ignore_rule_type: the concrete class for ignore rules, which implements the _IgnoreRule interface.

     :return: a generator of file paths which should not be ignored.
     """
     # A Dict of patterns, keyed using resolved, absolute paths
     patterns_by_dir: Dict[Path, List[_IgnoreRule]] = {}

     for root, dirs, files in os.walk(base_dir_path, followlinks=True):
         patterns: List[_IgnoreRule] = patterns_by_dir.get(Path(root).resolve(), [])

         ignore_file_path = Path(root) / ignore_file_name
         if ignore_file_path.is_file():
             with open(ignore_file_path) as ifile:
                 lines_no_comments = [re.sub(r"\s*#.*", "", line) for line in ifile.read().split("\n")]
                 # append new patterns and filter out "None" objects, which are invalid patterns
                 patterns += [
                     p
                     for p in [
                         ignore_rule_type.compile(line, Path(base_dir_path), ignore_file_path)
                         for line in lines_no_comments
                         if line
                     ]
                     if p is not None
                 ]
                 # evaluation order of patterns is important with negation
                 # so that later patterns can override earlier patterns
                 patterns = list(OrderedDict.fromkeys(patterns).keys())

         dirs[:] = [subdir for subdir in dirs if not ignore_rule_type.match(Path(root) / subdir, patterns)]

         # explicit loop for infinite recursion detection since we are following symlinks in this walk
         for sd in dirs:
             dirpath = (Path(root) / sd).resolve()
             if dirpath in patterns_by_dir:
                 raise RuntimeError(
                     "Detected recursive loop when walking DAG directory "
                     f"{base_dir_path}: {dirpath} has appeared more than once."
                 )
             patterns_by_dir.update({dirpath: patterns.copy()})

         for file in files:
             if file == ignore_file_name:
                 continue
             abs_file_path = Path(root) / file
             if ignore_rule_type.match(abs_file_path, patterns):
                 continue
             yield str(abs_file_path)


 def find_path_from_directory(
     base_dir_path: str,
     ignore_file_name: str,
     ignore_file_syntax: str = conf.get_mandatory_value('core', 'DAG_IGNORE_FILE_SYNTAX', fallback="regexp"),
 ) -> Generator[str, None, None]:
     """
     Recursively search the base path and return the list of file paths that should not be ignored.
     :param base_dir_path: the base path to be searched
     :param ignore_file_name: the file name in which specifies the patterns of files/dirs to be ignored
     :param ignore_file_syntax: the syntax of patterns in the ignore file: regexp or glob

     :return: a generator of file paths.
     """
     if ignore_file_syntax == "glob":
         return _find_path_from_directory(base_dir_path, ignore_file_name, _GlobIgnoreRule)
     elif ignore_file_syntax == "regexp" or not ignore_file_syntax:
         return _find_path_from_directory(base_dir_path, ignore_file_name, _RegexpIgnoreRule)
     else:
         raise ValueError(f"Unsupported ignore_file_syntax: {ignore_file_syntax}")


 def list_py_file_paths(
     directory: Union[str, "pathlib.Path"],
     safe_mode: bool = conf.getboolean('core', 'DAG_DISCOVERY_SAFE_MODE', fallback=True),
     include_examples: Optional[bool] = None,
 ):
     """
     Traverse a directory and look for Python files.

     :param directory: the directory to traverse
     :param safe_mode: whether to use a heuristic to determine whether a file
         contains Airflow DAG definitions. If not provided, use the
         core.DAG_DISCOVERY_SAFE_MODE configuration setting. If not set, default
         to safe.
     :param include_examples: include example DAGs
     :return: a list of paths to Python files in the specified directory
     :rtype: list[unicode]
     """
     if include_examples is None:
         include_examples = conf.getboolean('core', 'LOAD_EXAMPLES')
     file_paths: List[str] = []
     if directory is None:
         file_paths = []
     elif os.path.isfile(directory):
         file_paths = [str(directory)]
     elif os.path.isdir(directory):
         file_paths.extend(find_dag_file_paths(directory, safe_mode))
     if include_examples:
         from airflow import example_dags

         example_dag_folder = example_dags.__path__[0]  # type: ignore
         file_paths.extend(list_py_file_paths(example_dag_folder, safe_mode, include_examples=False))
     return file_paths


 def find_dag_file_paths(directory: Union[str, "pathlib.Path"], safe_mode: bool) -> List[str]:
     """Finds file paths of all DAG files."""
     file_paths = []

     for file_path in find_path_from_directory(str(directory), ".airflowignore"):
         try:
             if not os.path.isfile(file_path):
                 continue
             _, file_ext = os.path.splitext(os.path.split(file_path)[-1])
             if file_ext != '.py' and not zipfile.is_zipfile(file_path):
                 continue
             if not might_contain_dag(file_path, safe_mode):
                 continue

             file_paths.append(file_path)
         except Exception:
             log.exception("Error while examining %s", file_path)

     return file_paths


 COMMENT_PATTERN = re.compile(r"\s*#.*")


 def might_contain_dag(file_path: str, safe_mode: bool, zip_file: Optional[zipfile.ZipFile] = None):
     """
     Heuristic that guesses whether a Python file contains an Airflow DAG definition.

     :param file_path: Path to the file to be checked.
     :param safe_mode: Is safe mode active?. If no, this function always returns True.
     :param zip_file: if passed, checks the archive. Otherwise, check local filesystem.
     :return: True, if file might contain DAGs.
     """
     if not safe_mode:
         return True
     if zip_file:
         with zip_file.open(file_path) as current_file:
             content = current_file.read()
     else:
         if zipfile.is_zipfile(file_path):
             return True
         with open(file_path, 'rb') as dag_file:
             content = dag_file.read()
     content = content.lower()
     return all(s in content for s in (b'dag', b'airflow'))
	#
	# Licensed to the Apache Software Foundation (ASF) under one
	# or more contributor license agreements. See the NOTICE file
	# distributed with this work for additional information
	# regarding copyright ownership. The ASF licenses this file
	# to you 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 io
	import logging
	import os
	import re
	import zipfile
	from collections import OrderedDict
	from pathlib import Path
	from typing import TYPE_CHECKING, Dict, Generator, List, NamedTuple, Optional, Pattern, Type, Union, overload

	from pathspec.patterns import GitWildMatchPattern
	from typing_extensions import Protocol

	from airflow.configuration import conf

	if TYPE_CHECKING:
	import pathlib

	log = logging.getLogger(__name__)


	class _IgnoreRule(Protocol):
	"""Interface for ignore rules for structural subtyping"""

	@staticmethod
	def compile(pattern: str, base_dir: Path, definition_file: Path) -> Optional['_IgnoreRule']:
	"""
	Build an ignore rule from the supplied pattern where base_dir
	and definition_file should be absolute paths.
	"""

	@staticmethod
	def match(path: Path, rules: List['_IgnoreRule']) -> bool:
	"""Match a candidate absolute path against a list of rules"""


	class _RegexpIgnoreRule(NamedTuple):
	"""Typed namedtuple with utility functions for regexp ignore rules"""

	pattern: Pattern
	base_dir: Path

	@staticmethod
	def compile(pattern: str, base_dir: Path, definition_file: Path) -> Optional[_IgnoreRule]:
	"""Build an ignore rule from the supplied regexp pattern and log a useful warning if it is invalid"""
	try:
	return _RegexpIgnoreRule(re.compile(pattern), base_dir)
	except re.error as e:
	log.warning("Ignoring invalid regex '%s' from %s: %s", pattern, definition_file, e)
	return None

	@staticmethod
	def match(path: Path, rules: List[_IgnoreRule]) -> bool:
	"""Match a list of ignore rules against the supplied path"""
	for rule in rules:
	if not isinstance(rule, _RegexpIgnoreRule):
	raise ValueError(f"_RegexpIgnoreRule cannot match rules of type: {type(rule)}")
	if rule.pattern.search(str(path.relative_to(rule.base_dir))) is not None:
	return True
	return False


	class _GlobIgnoreRule(NamedTuple):
	"""Typed namedtuple with utility functions for glob ignore rules"""

	pattern: Pattern
	raw_pattern: str
	include: Optional[bool] = None
	relative_to: Optional[Path] = None

	@staticmethod
	def compile(pattern: str, _, definition_file: Path) -> Optional[_IgnoreRule]:
	"""Build an ignore rule from the supplied glob pattern and log a useful warning if it is invalid"""
	relative_to: Optional[Path] = None
	if pattern.strip() == "/":
	# "/" doesn't match anything in gitignore
	log.warning("Ignoring no-op glob pattern '/' from %s", definition_file)
	return None
	if pattern.startswith("/") or "/" in pattern.rstrip("/"):
	# See https://git-scm.com/docs/gitignore
	# > If there is a separator at the beginning or middle (or both) of the pattern, then the
	# > pattern is relative to the directory level of the particular .gitignore file itself.
	# > Otherwise the pattern may also match at any level below the .gitignore level.
	relative_to = definition_file.parent
	ignore_pattern = GitWildMatchPattern(pattern)
	return _GlobIgnoreRule(ignore_pattern.regex, pattern, ignore_pattern.include, relative_to)

	@staticmethod
	def match(path: Path, rules: List[_IgnoreRule]) -> bool:
	"""Match a list of ignore rules against the supplied path"""
	matched = False
	for r in rules:
	if not isinstance(r, _GlobIgnoreRule):
	raise ValueError(f"_GlobIgnoreRule cannot match rules of type: {type(r)}")
	rule: _GlobIgnoreRule = r # explicit typing to make mypy play nicely
	rel_path = str(path.relative_to(rule.relative_to) if rule.relative_to else path.name)
	if rule.raw_pattern.endswith("/") and path.is_dir():
	# ensure the test path will potentially match a directory pattern if it is a directory
	rel_path += "/"
	if rule.include is not None and rule.pattern.match(rel_path) is not None:
	matched = rule.include
	return matched


	def TemporaryDirectory(args, *kwargs):
	"""This function is deprecated. Please use `tempfile.TemporaryDirectory`"""
	import warnings
	from tempfile import TemporaryDirectory as TmpDir

	warnings.warn(
	"This function is deprecated. Please use `tempfile.TemporaryDirectory`",
	DeprecationWarning,
	stacklevel=2,
	)

	return TmpDir(args, *kwargs)


	def mkdirs(path, mode):
	"""
	Creates the directory specified by path, creating intermediate directories
	as necessary. If directory already exists, this is a no-op.

	:param path: The directory to create
	:param mode: The mode to give to the directory e.g. 0o755, ignores umask
	"""
	import warnings

	warnings.warn(
	f"This function is deprecated. Please use `pathlib.Path({path}).mkdir`",
	DeprecationWarning,
	stacklevel=2,
	)
	Path(path).mkdir(mode=mode, parents=True, exist_ok=True)


	ZIP_REGEX = re.compile(fr'((.\.zip){re.escape(os.sep)})?(.)')


	@overload
	def correct_maybe_zipped(fileloc: None) -> None:
	...


	@overload
	def correct_maybe_zipped(fileloc: Union[str, Path]) -> Union[str, Path]:
	...


	def correct_maybe_zipped(fileloc: Union[None, str, Path]) -> Union[None, str, Path]:
	"""
	If the path contains a folder with a .zip suffix, then
	the folder is treated as a zip archive and path to zip is returned.
	"""
	if not fileloc:
	return fileloc
	search_ = ZIP_REGEX.search(str(fileloc))
	if not search_:
	return fileloc
	_, archive, _ = search_.groups()
	if archive and zipfile.is_zipfile(archive):
	return archive
	else:
	return fileloc


	def open_maybe_zipped(fileloc, mode='r'):
	"""
	Opens the given file. If the path contains a folder with a .zip suffix, then
	the folder is treated as a zip archive, opening the file inside the archive.

	:return: a file object, as in `open`, or as in `ZipFile.open`.
	"""
	_, archive, filename = ZIP_REGEX.search(fileloc).groups()
	if archive and zipfile.is_zipfile(archive):
	return io.TextIOWrapper(zipfile.ZipFile(archive, mode=mode).open(filename))
	else:

	return open(fileloc, mode=mode)


	def _find_path_from_directory(
	base_dir_path: str,
	ignore_file_name: str,
	ignore_rule_type: Type[_IgnoreRule],
	) -> Generator[str, None, None]:
	"""
	Recursively search the base path and return the list of file paths that should not be ignored by
	regular expressions in any ignore files at each directory level.
	:param base_dir_path: the base path to be searched
	:param ignore_file_name: the file name containing regular expressions for files that should be ignored.
	:param ignore_rule_type: the concrete class for ignore rules, which implements the _IgnoreRule interface.

	:return: a generator of file paths which should not be ignored.
	"""
	# A Dict of patterns, keyed using resolved, absolute paths
	patterns_by_dir: Dict[Path, List[_IgnoreRule]] = {}

	for root, dirs, files in os.walk(base_dir_path, followlinks=True):
	patterns: List[_IgnoreRule] = patterns_by_dir.get(Path(root).resolve(), [])

	ignore_file_path = Path(root) / ignore_file_name
	if ignore_file_path.is_file():
	with open(ignore_file_path) as ifile:
	lines_no_comments = [re.sub(r"\s#.", "", line) for line in ifile.read().split("\n")]
	# append new patterns and filter out "None" objects, which are invalid patterns
	patterns += [
	p
	for p in [
	ignore_rule_type.compile(line, Path(base_dir_path), ignore_file_path)
	for line in lines_no_comments
	if line
	]
	if p is not None
	]
	# evaluation order of patterns is important with negation
	# so that later patterns can override earlier patterns
	patterns = list(OrderedDict.fromkeys(patterns).keys())

	dirs[:] = [subdir for subdir in dirs if not ignore_rule_type.match(Path(root) / subdir, patterns)]

	# explicit loop for infinite recursion detection since we are following symlinks in this walk
	for sd in dirs:
	dirpath = (Path(root) / sd).resolve()
	if dirpath in patterns_by_dir:
	raise RuntimeError(
	"Detected recursive loop when walking DAG directory "
	f"{base_dir_path}: {dirpath} has appeared more than once."
	)
	patterns_by_dir.update({dirpath: patterns.copy()})

	for file in files:
	if file == ignore_file_name:
	continue
	abs_file_path = Path(root) / file
	if ignore_rule_type.match(abs_file_path, patterns):
	continue
	yield str(abs_file_path)


	def find_path_from_directory(
	base_dir_path: str,
	ignore_file_name: str,
	ignore_file_syntax: str = conf.get_mandatory_value('core', 'DAG_IGNORE_FILE_SYNTAX', fallback="regexp"),
	) -> Generator[str, None, None]:
	"""
	Recursively search the base path and return the list of file paths that should not be ignored.
	:param base_dir_path: the base path to be searched
	:param ignore_file_name: the file name in which specifies the patterns of files/dirs to be ignored
	:param ignore_file_syntax: the syntax of patterns in the ignore file: regexp or glob

	:return: a generator of file paths.
	"""
	if ignore_file_syntax == "glob":
	return _find_path_from_directory(base_dir_path, ignore_file_name, _GlobIgnoreRule)
	elif ignore_file_syntax == "regexp" or not ignore_file_syntax:
	return _find_path_from_directory(base_dir_path, ignore_file_name, _RegexpIgnoreRule)
	else:
	raise ValueError(f"Unsupported ignore_file_syntax: {ignore_file_syntax}")


	def list_py_file_paths(
	directory: Union[str, "pathlib.Path"],
	safe_mode: bool = conf.getboolean('core', 'DAG_DISCOVERY_SAFE_MODE', fallback=True),
	include_examples: Optional[bool] = None,
	):
	"""
	Traverse a directory and look for Python files.

	:param directory: the directory to traverse
	:param safe_mode: whether to use a heuristic to determine whether a file
	contains Airflow DAG definitions. If not provided, use the
	core.DAG_DISCOVERY_SAFE_MODE configuration setting. If not set, default
	to safe.
	:param include_examples: include example DAGs
	:return: a list of paths to Python files in the specified directory
	:rtype: list[unicode]
	"""
	if include_examples is None:
	include_examples = conf.getboolean('core', 'LOAD_EXAMPLES')
	file_paths: List[str] = []
	if directory is None:
	file_paths = []
	elif os.path.isfile(directory):
	file_paths = [str(directory)]
	elif os.path.isdir(directory):
	file_paths.extend(find_dag_file_paths(directory, safe_mode))
	if include_examples:
	from airflow import example_dags

	example_dag_folder = example_dags.__path__[0] # type: ignore
	file_paths.extend(list_py_file_paths(example_dag_folder, safe_mode, include_examples=False))
	return file_paths


	def find_dag_file_paths(directory: Union[str, "pathlib.Path"], safe_mode: bool) -> List[str]:
	"""Finds file paths of all DAG files."""
	file_paths = []

	for file_path in find_path_from_directory(str(directory), ".airflowignore"):
	try:
	if not os.path.isfile(file_path):
	continue
	_, file_ext = os.path.splitext(os.path.split(file_path)[-1])
	if file_ext != '.py' and not zipfile.is_zipfile(file_path):
	continue
	if not might_contain_dag(file_path, safe_mode):
	continue

	file_paths.append(file_path)
	except Exception:
	log.exception("Error while examining %s", file_path)

	return file_paths


	COMMENT_PATTERN = re.compile(r"\s#.")


	def might_contain_dag(file_path: str, safe_mode: bool, zip_file: Optional[zipfile.ZipFile] = None):
	"""
	Heuristic that guesses whether a Python file contains an Airflow DAG definition.

	:param file_path: Path to the file to be checked.
	:param safe_mode: Is safe mode active?. If no, this function always returns True.
	:param zip_file: if passed, checks the archive. Otherwise, check local filesystem.
	:return: True, if file might contain DAGs.
	"""
	if not safe_mode:
	return True
	if zip_file:
	with zip_file.open(file_path) as current_file:
	content = current_file.read()
	else:
	if zipfile.is_zipfile(file_path):
	return True
	with open(file_path, 'rb') as dag_file:
	content = dag_file.read()
	content = content.lower()
	return all(s in content for s in (b'dag', b'airflow'))