我们从Python开源项目中，提取了以下38个代码示例，用于说明如何使用posixpath.samestat()。
def test_samestat(self): test_fn = support.TESTFN + "1" self._create_file(test_fn) test_fns = [test_fn]*2 stats = map(os.stat, test_fns) self.assertTrue(posixpath.samestat(*stats))
def test_samestat_on_links(self): test_fn1 = support.TESTFN + "1" test_fn2 = support.TESTFN + "2" self._create_file(test_fn1) test_fns = (test_fn1, test_fn2) os.symlink(*test_fns) stats = map(os.stat, test_fns) self.assertTrue(posixpath.samestat(*stats)) os.remove(test_fn2) self._create_file(test_fn2) stats = map(os.stat, test_fns) self.assertFalse(posixpath.samestat(*stats)) self.assertRaises(TypeError, posixpath.samestat)
def test_samestat(self): f = open(test_support.TESTFN + "1", "wb") try: f.write("foo") f.close() self.assertIs( posixpath.samestat( os.stat(test_support.TESTFN + "1"), os.stat(test_support.TESTFN + "1") ), True ) # If we don't have links, assume that os.stat() doesn't return # reasonable inode information and thus, that samestat() doesn't # work. if hasattr(os, "symlink"): os.symlink(test_support.TESTFN + "1", test_support.TESTFN + "2") self.assertIs( posixpath.samestat( os.stat(test_support.TESTFN + "1"), os.stat(test_support.TESTFN + "2") ), True ) os.remove(test_support.TESTFN + "2") f = open(test_support.TESTFN + "2", "wb") f.write("bar") f.close() self.assertIs( posixpath.samestat( os.stat(test_support.TESTFN + "1"), os.stat(test_support.TESTFN + "2") ), False ) finally: if not f.close(): f.close()
def fwalk(top=".", topdown=True, onerror=None, *, follow_symlinks=False, dir_fd=None): """Directory tree generator. This behaves exactly like walk(), except that it yields a 4-tuple dirpath, dirnames, filenames, dirfd `dirpath`, `dirnames` and `filenames` are identical to walk() output, and `dirfd` is a file descriptor referring to the directory `dirpath`. The advantage of fwalk() over walk() is that it's safe against symlink races (when follow_symlinks is False). If dir_fd is not None, it should be a file descriptor open to a directory, and top should be relative; top will then be relative to that directory. (dir_fd is always supported for fwalk.) Caution: Since fwalk() yields file descriptors, those are only valid until the next iteration step, so you should dup() them if you want to keep them for a longer period. Example: import os for root, dirs, files, rootfd in os.fwalk('python/Lib/email'): print(root, "consumes", end="") print(sum([os.stat(name, dir_fd=rootfd).st_size for name in files]), end="") print("bytes in", len(files), "non-directory files") if 'CVS' in dirs: dirs.remove('CVS') # don't visit CVS directories """ if not isinstance(top, int) or not hasattr(top, '__index__'): top = fspath(top) # Note: To guard against symlink races, we use the standard # lstat()/open()/fstat() trick. orig_st = stat(top, follow_symlinks=False, dir_fd=dir_fd) topfd = open(top, O_RDONLY, dir_fd=dir_fd) try: if (follow_symlinks or (st.S_ISDIR(orig_st.st_mode) and path.samestat(orig_st, stat(topfd)))): yield from _fwalk(topfd, top, topdown, onerror, follow_symlinks) finally: close(topfd)
def _fwalk(topfd, toppath, topdown, onerror, follow_symlinks): # Note: This uses O(depth of the directory tree) file descriptors: if # necessary, it can be adapted to only require O(1) FDs, see issue # #13734. names = listdir(topfd) dirs, nondirs = [], [] for name in names: try: # Here, we don't use AT_SYMLINK_NOFOLLOW to be consistent with # walk() which reports symlinks to directories as directories. # We do however check for symlinks before recursing into # a subdirectory. if st.S_ISDIR(stat(name, dir_fd=topfd).st_mode): dirs.append(name) else: nondirs.append(name) except OSError: try: # Add dangling symlinks, ignore disappeared files if st.S_ISLNK(stat(name, dir_fd=topfd, follow_symlinks=False) .st_mode): nondirs.append(name) except OSError: continue if topdown: yield toppath, dirs, nondirs, topfd for name in dirs: try: orig_st = stat(name, dir_fd=topfd, follow_symlinks=follow_symlinks) dirfd = open(name, O_RDONLY, dir_fd=topfd) except OSError as err: if onerror is not None: onerror(err) continue try: if follow_symlinks or path.samestat(orig_st, stat(dirfd)): dirpath = path.join(toppath, name) yield from _fwalk(dirfd, dirpath, topdown, onerror, follow_symlinks) finally: close(dirfd) if not topdown: yield toppath, dirs, nondirs, topfd
def fwalk(top=".", topdown=True, onerror=None, *, follow_symlinks=False, dir_fd=None): """Directory tree generator. This behaves exactly like walk(), except that it yields a 4-tuple dirpath, dirnames, filenames, dirfd `dirpath`, `dirnames` and `filenames` are identical to walk() output, and `dirfd` is a file descriptor referring to the directory `dirpath`. The advantage of fwalk() over walk() is that it's safe against symlink races (when follow_symlinks is False). If dir_fd is not None, it should be a file descriptor open to a directory, and top should be relative; top will then be relative to that directory. (dir_fd is always supported for fwalk.) Caution: Since fwalk() yields file descriptors, those are only valid until the next iteration step, so you should dup() them if you want to keep them for a longer period. Example: import os for root, dirs, files, rootfd in os.fwalk('python/Lib/email'): print(root, "consumes", end="") print(sum([os.stat(name, dir_fd=rootfd).st_size for name in files]), end="") print("bytes in", len(files), "non-directory files") if 'CVS' in dirs: dirs.remove('CVS') # don't visit CVS directories """ # Note: To guard against symlink races, we use the standard # lstat()/open()/fstat() trick. orig_st = stat(top, follow_symlinks=False, dir_fd=dir_fd) topfd = open(top, O_RDONLY, dir_fd=dir_fd) try: if (follow_symlinks or (st.S_ISDIR(orig_st.st_mode) and path.samestat(orig_st, stat(topfd)))): yield from _fwalk(topfd, top, topdown, onerror, follow_symlinks) finally: close(topfd)
def _fwalk(topfd, toppath, topdown, onerror, follow_symlinks): # Note: This uses O(depth of the directory tree) file descriptors: if # necessary, it can be adapted to only require O(1) FDs, see issue # #13734. names = listdir(topfd) dirs, nondirs = [], [] for name in names: try: # Here, we don't use AT_SYMLINK_NOFOLLOW to be consistent with # walk() which reports symlinks to directories as directories. # We do however check for symlinks before recursing into # a subdirectory. if st.S_ISDIR(stat(name, dir_fd=topfd).st_mode): dirs.append(name) else: nondirs.append(name) except FileNotFoundError: try: # Add dangling symlinks, ignore disappeared files if st.S_ISLNK(stat(name, dir_fd=topfd, follow_symlinks=False) .st_mode): nondirs.append(name) except FileNotFoundError: continue if topdown: yield toppath, dirs, nondirs, topfd for name in dirs: try: orig_st = stat(name, dir_fd=topfd, follow_symlinks=follow_symlinks) dirfd = open(name, O_RDONLY, dir_fd=topfd) except OSError as err: if onerror is not None: onerror(err) continue try: if follow_symlinks or path.samestat(orig_st, stat(dirfd)): dirpath = path.join(toppath, name) yield from _fwalk(dirfd, dirpath, topdown, onerror, follow_symlinks) finally: close(dirfd) if not topdown: yield toppath, dirs, nondirs, topfd
def _fwalk(topfd, toppath, topdown, onerror, follow_symlinks): # Note: This uses O(depth of the directory tree) file descriptors: if # necessary, it can be adapted to only require O(1) FDs, see issue # #13734. names = listdir(topfd) dirs, nondirs = [], [] for name in names: try: # Here, we don't use AT_SYMLINK_NOFOLLOW to be consistent with # walk() which reports symlinks to directories as directories. # We do however check for symlinks before recursing into # a subdirectory. if st.S_ISDIR(stat(name, dir_fd=topfd).st_mode): dirs.append(name) else: nondirs.append(name) except FileNotFoundError: try: # Add dangling symlinks, ignore disappeared files if st.S_ISLNK(stat(name, dir_fd=topfd, follow_symlinks=False) .st_mode): nondirs.append(name) except FileNotFoundError: continue if topdown: yield toppath, dirs, nondirs, topfd for name in dirs: try: orig_st = stat(name, dir_fd=topfd, follow_symlinks=follow_symlinks) dirfd = open(name, O_RDONLY, dir_fd=topfd) except error as err: if onerror is not None: onerror(err) return try: if follow_symlinks or path.samestat(orig_st, stat(dirfd)): dirpath = path.join(toppath, name) yield from _fwalk(dirfd, dirpath, topdown, onerror, follow_symlinks) finally: close(dirfd) if not topdown: yield toppath, dirs, nondirs, topfd
def _fwalk(topfd, toppath, topdown, onerror, follow_symlinks): # Note: This uses O(depth of the directory tree) file descriptors: if # necessary, it can be adapted to only require O(1) FDs, see issue # #13734. names = listdir(topfd) dirs, nondirs = [], [] for name in names: try: # Here, we don't use AT_SYMLINK_NOFOLLOW to be consistent with # walk() which reports symlinks to directories as directories. # We do however check for symlinks before recursing into # a subdirectory. if st.S_ISDIR(stat(name, dir_fd=topfd).st_mode): dirs.append(name) else: nondirs.append(name) except FileNotFoundError: try: # Add dangling symlinks, ignore disappeared files if st.S_ISLNK(stat(name, dir_fd=topfd, follow_symlinks=False) .st_mode): nondirs.append(name) except FileNotFoundError: continue if topdown: yield toppath, dirs, nondirs, topfd for name in dirs: try: orig_st = stat(name, dir_fd=topfd, follow_symlinks=follow_symlinks) dirfd = open(name, O_RDONLY, dir_fd=topfd) except OSError as err: if onerror is not None: onerror(err) return try: if follow_symlinks or path.samestat(orig_st, stat(dirfd)): dirpath = path.join(toppath, name) yield from _fwalk(dirfd, dirpath, topdown, onerror, follow_symlinks) finally: close(dirfd) if not topdown: yield toppath, dirs, nondirs, topfd
