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66 lines
1.9 KiB
Python
66 lines
1.9 KiB
Python
5 years ago
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from __future__ import absolute_import, unicode_literals
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import logging
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import os
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import platform
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import sys
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import tempfile
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IMPLEMENTATION = platform.python_implementation()
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IS_PYPY = IMPLEMENTATION == "PyPy"
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IS_CPYTHON = IMPLEMENTATION == "CPython"
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PY3 = sys.version_info[0] == 3
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PY2 = sys.version_info[0] == 2
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IS_WIN = sys.platform == "win32"
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ROOT = os.path.realpath(os.path.join(os.path.abspath(__file__), os.path.pardir, os.path.pardir))
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IS_ZIPAPP = os.path.isfile(ROOT)
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WIN_CPYTHON_2 = IS_CPYTHON and IS_WIN and PY2
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_CAN_SYMLINK = _FS_CASE_SENSITIVE = _CFG_DIR = _DATA_DIR = None
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def fs_is_case_sensitive():
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global _FS_CASE_SENSITIVE
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if _FS_CASE_SENSITIVE is None:
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with tempfile.NamedTemporaryFile(prefix="TmP") as tmp_file:
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_FS_CASE_SENSITIVE = not os.path.exists(tmp_file.name.lower())
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logging.debug("filesystem is %scase-sensitive", "" if _FS_CASE_SENSITIVE else "not ")
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return _FS_CASE_SENSITIVE
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def fs_supports_symlink():
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global _CAN_SYMLINK
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if _CAN_SYMLINK is None:
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can = False
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if hasattr(os, "symlink"):
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if IS_WIN:
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with tempfile.NamedTemporaryFile(prefix="TmP") as tmp_file:
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temp_dir = os.path.dirname(tmp_file.name)
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dest = os.path.join(temp_dir, "{}-{}".format(tmp_file.name, "b"))
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try:
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os.symlink(tmp_file.name, dest)
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can = True
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except (OSError, NotImplementedError):
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pass
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logging.debug("symlink on filesystem does%s work", "" if can else " not")
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else:
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can = True
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_CAN_SYMLINK = can
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return _CAN_SYMLINK
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__all__ = (
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"IS_PYPY",
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"IS_CPYTHON",
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"PY3",
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"PY2",
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"IS_WIN",
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"fs_is_case_sensitive",
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"fs_supports_symlink",
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"ROOT",
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"IS_ZIPAPP",
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"WIN_CPYTHON_2",
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)
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