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200 lines
6.7 KiB
200 lines
6.7 KiB
import os
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import stat
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try:
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from pathlib import Path
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except ImportError:
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try:
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# Python 2 backport
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from pathlib2 import Path
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except ImportError:
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class Path(object):
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"""Dummy for isinstance checks"""
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pass
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__all__ = ['assert_path_exists', 'assert_not_path_exists',
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'assert_isfile', 'assert_not_isfile',
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'assert_isdir', 'assert_not_isdir',
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'assert_islink', 'assert_not_islink',
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'assert_ispipe', 'assert_not_ispipe',
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'assert_issocket', 'assert_not_issocket',
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]
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if hasattr(os, 'fspath'):
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_strpath = os.fspath
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else:
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def _strpath(p):
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if hasattr(p, '__fspath__'):
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return p.__fspath__()
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elif isinstance(p, Path):
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return str(p)
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return p
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def _stat_for_assert(path, follow_symlinks=True, msg=None):
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stat = os.stat if follow_symlinks else os.lstat
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try:
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return stat(path)
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except OSError:
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if msg is None:
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msg = "Path does not exist, or can't be stat-ed: %r" % path
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raise AssertionError(msg)
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def assert_path_exists(path, msg=None):
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"""Assert that something exists at the given path.
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"""
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_stat_for_assert(_strpath(path), True, msg)
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def assert_not_path_exists(path, msg=None):
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"""Assert that nothing exists at the given path.
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"""
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path = _strpath(path)
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if os.path.exists(path):
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if msg is None:
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msg = "Path exists: %r" % path
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raise AssertionError(msg)
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def assert_isfile(path, follow_symlinks=True, msg=None):
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"""Assert that path exists and is a regular file.
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With follow_symlinks=True, the default, this will pass if path is a symlink
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to a regular file. With follow_symlinks=False, it will fail in that case.
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"""
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path = _strpath(path)
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st = _stat_for_assert(path, follow_symlinks, msg)
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if not stat.S_ISREG(st.st_mode):
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if msg is None:
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msg = "Path exists, but is not a regular file: %r" % path
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raise AssertionError(msg)
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def assert_not_isfile(path, follow_symlinks=True, msg=None):
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"""Assert that path exists but is not a regular file.
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With follow_symlinks=True, the default, this will fail if path is a symlink
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to a regular file. With follow_symlinks=False, it will pass in that case.
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"""
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path = _strpath(path)
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st = _stat_for_assert(path, follow_symlinks, msg)
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if stat.S_ISREG(st.st_mode):
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if msg is None:
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msg = "Path is a regular file: %r" % path
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raise AssertionError(msg)
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def assert_isdir(path, follow_symlinks=True, msg=None):
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"""Assert that path exists and is a directory.
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With follow_symlinks=True, the default, this will pass if path is a symlink
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to a directory. With follow_symlinks=False, it will fail in that case.
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"""
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path = _strpath(path)
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st = _stat_for_assert(path, follow_symlinks, msg)
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if not stat.S_ISDIR(st.st_mode):
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if msg is None:
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msg = "Path exists, but is not a directory: %r" % path
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raise AssertionError(msg)
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def assert_not_isdir(path, follow_symlinks=True, msg=None):
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"""Assert that path exists but is not a directory.
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With follow_symlinks=True, the default, this will fail if path is a symlink
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to a directory. With follow_symlinks=False, it will pass in that case.
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"""
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path = _strpath(path)
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st = _stat_for_assert(path, follow_symlinks, msg)
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if stat.S_ISDIR(st.st_mode):
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if msg is None:
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msg = "Path is a directory: %r" % path
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raise AssertionError(msg)
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_link_target_msg = """Symlink target of:
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{path}
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Expected:
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{expected}
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Actual:
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{actual}
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"""
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def assert_islink(path, to=None, msg=None):
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"""Assert that path exists and is a symlink.
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If to is specified, also check that it is the target of the symlink.
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"""
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path = _strpath(path)
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st = _stat_for_assert(path, False, msg)
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if not stat.S_ISLNK(st.st_mode):
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if msg is None:
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msg = "Path exists, but is not a symlink: %r" % path
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raise AssertionError(msg)
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if to is not None:
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to = _strpath(to)
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target = os.readlink(path)
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# TODO: Normalise the target to an absolute path?
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if target != to:
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if msg is None:
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msg = _link_target_msg.format(path=path, expected=to, actual=target)
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raise AssertionError(msg)
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def assert_not_islink(path, msg=None):
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"""Assert that path exists but is not a symlink.
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"""
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path = _strpath(path)
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st = _stat_for_assert(path, False, msg)
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if stat.S_ISLNK(st.st_mode):
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if msg is None:
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msg = "Path is a symlink: %r" % path
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raise AssertionError(msg)
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def assert_ispipe(path, follow_symlinks=True, msg=None):
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"""Assert that path exists and is a named pipe (FIFO).
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With follow_symlinks=True, the default, this will pass if path is a symlink
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to a named pipe. With follow_symlinks=False, it will fail in that case.
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"""
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path = _strpath(path)
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st = _stat_for_assert(path, follow_symlinks, msg)
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if not stat.S_ISFIFO(st.st_mode):
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if msg is None:
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msg = "Path exists, but is not a named pipe: %r" % path
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raise AssertionError(msg)
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def assert_not_ispipe(path, follow_symlinks=True, msg=None):
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"""Assert that path exists but is not a named pipe (FIFO).
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With follow_symlinks=True, the default, this will fail if path is a symlink
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to a named pipe. With follow_symlinks=False, it will pass in that case.
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"""
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path = _strpath(path)
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st = _stat_for_assert(path, follow_symlinks, msg)
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if stat.S_ISFIFO(st.st_mode):
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if msg is None:
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msg = "Path is a named pipe: %r" % path
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raise AssertionError(msg)
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def assert_issocket(path, follow_symlinks=True, msg=None):
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"""Assert that path exists and is a Unix domain socket.
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With follow_symlinks=True, the default, this will pass if path is a symlink
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to a Unix domain socket. With follow_symlinks=False, it will fail in that case.
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"""
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path = _strpath(path)
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st = _stat_for_assert(path, follow_symlinks, msg)
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if not stat.S_ISSOCK(st.st_mode):
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if msg is None:
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msg = "Path exists, but is not a socket: %r" % path
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raise AssertionError(msg)
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def assert_not_issocket(path, follow_symlinks=True, msg=None):
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"""Assert that path exists but is not a Unix domain socket.
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With follow_symlinks=True, the default, this will fail if path is a symlink
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to a Unix domain socket. With follow_symlinks=False, it will pass in that case.
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"""
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path = _strpath(path)
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st = _stat_for_assert(path, follow_symlinks, msg)
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if stat.S_ISSOCK(st.st_mode):
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if msg is None:
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msg = "Path is a socket: %r" % path
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raise AssertionError(msg)
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