def test_read(self):
self._fillfile(b"0123456789")
ghost = GhostFile(self._datapath, None)
with open(self._datapath, 'rb') as f:
self.assertEqual(ghost.read(10, 0, f.fileno()), b"0123456789")
with open(self._datapath, 'rb') as f:
self.assertEqual(ghost.read(5, 5, f.fileno()), b"56789")
with open(self._datapath, 'rb') as f:
self.assertEqual(ghost.read(5, 8, f.fileno()), b"89")
with open(self._datapath, 'rb') as f:
self.assertEqual(ghost.read(5, 10, f.fileno()), b"")
with open(self._datapath, 'r+b') as f:
ghost.apply(f.fileno())
ghost.release()
# Make sure the file was not modified
with open(self._datapath, 'rb') as f:
self.assertEqual(f.read(), b"0123456789")
def test_truncate(self):
self._fillfile(b"0123456789")
ghost = GhostFile(self._datapath, None)
with open(self._datapath, 'r+b') as f:
ghost.truncate(0)
self.assertEqual(ghost.size, 0)
self.assertEqual(ghost.read(100, 0, f.fileno()), b"")
# Make sure the file was not modified
with open(self._datapath, 'rb') as f:
self.assertEqual(f.read(), b"0123456789")
with open(self._datapath, 'r+b') as f:
ghost.apply(f.fileno())
ghost.release()
# Make sure the file *was* modified
with open(self._datapath, 'rb') as f:
self.assertEqual(f.read(), b"")
def _add_ghost_file(self, ghost_path: str) -> GhostFile:
"""
Adds a ghost file for the specified virtual path.
If a ghost file already exists for that path, it doesn't add another one but keeps track
of this additional reference (see `SemanticFS._delete_ghost_file`).
:param ghost_path: the virtual path for the ghost file
:return: the added GhostFile
"""
dspath = self._datastore_path(ghost_path)
normpath = os.path.normcase(os.path.normpath(ghost_path))
if (dspath, normpath) in self._sem_writing_files:
assert self._sem_writing_files_count[dspath, normpath] > 0
self._sem_writing_files_count[dspath, normpath] += 1
else:
assert (dspath, normpath) not in self._sem_writing_files_count
self._sem_writing_files[dspath, normpath] = GhostFile(
dspath, lambda: self._clear_stat_cache(PathInfo(ghost_path)))
self._sem_writing_files_count[dspath, normpath] = 1
assert (dspath, normpath
) in self._sem_writing_files and self._sem_writing_files_count[
dspath, normpath] > 0
return self._sem_writing_files[dspath, normpath]
def test_write_same(self):
self._fillfile(b"0123456789")
ghost = GhostFile(self._datapath, None)
with open(self._datapath, 'r+b') as f:
ghost.write(b"01234", 0, f.fileno())
self.assertEqual(ghost.read(100, 0, f.fileno()), b"0123456789")
with open(self._datapath, 'r+b') as f:
ghost.write(b"789", 7, f.fileno())
self.assertEqual(ghost.read(100, 0, f.fileno()), b"0123456789")
with open(self._datapath, 'r+b') as f:
ghost.write(b"345", 3, f.fileno())
self.assertEqual(ghost.read(100, 0, f.fileno()), b"0123456789")
with open(self._datapath, 'r+b') as f:
ghost.apply(f.fileno())
ghost.release()
# Make sure the file was not modified
with open(self._datapath, 'rb') as f:
self.assertEqual(f.read(), b"0123456789")
def test_empty_read(self):
self._fillfile(b"")
ghost = GhostFile(self._datapath, None)
with open(self._datapath, 'rb') as f:
self.assertEqual(ghost.read(10, 0, f.fileno()), b"")
ghost.release()
def test_write_diff(self):
self._fillfile(b"0123456789")
ghost = GhostFile(self._datapath, None)
with open(self._datapath, 'r+b') as f:
ghost.write(b"abcd", 0, f.fileno())
self.assertEqual(ghost.read(100, 0, f.fileno()), b"abcd456789")
# Make sure the file *was* modified
with open(self._datapath, 'rb') as f:
self.assertEqual(f.read(), b"abcd456789")
with open(self._datapath, 'r+b') as f:
ghost.write(b"hij", 7, f.fileno())
self.assertEqual(ghost.read(100, 0, f.fileno()), b"abcd456hij")
with open(self._datapath, 'r+b') as f:
ghost.write(b"XXX", 3, f.fileno())
self.assertEqual(ghost.read(100, 0, f.fileno()), b"abcXXX6hij")
with open(self._datapath, 'r+b') as f:
ghost.apply(f.fileno())
ghost.release()
# Make sure the file *was* modified
with open(self._datapath, 'rb') as f:
self.assertEqual(f.read(), b"abcXXX6hij")