class TestPreserveTimes(PicardTestCase):
def setUp(self):
super().setUp()
self.tmp_directory = self.mktmpdir()
filepath = os.path.join(self.tmp_directory, 'a.mp3')
self.file = File(filepath)
def _create_testfile(self):
# create a dummy file
with open(self.file.filename, 'w') as f:
f.write('xxx')
f.flush()
os.fsync(f.fileno())
def _modify_testfile(self):
# dummy file modification, append data to it
with open(self.file.filename, 'a') as f:
f.write('yyy')
f.flush()
os.fsync(f.fileno())
def _read_testfile(self):
with open(self.file.filename, 'r') as f:
return f.read()
def test_preserve_times(self):
self._create_testfile()
# test if times are preserved
(before_atime_ns, before_mtime_ns) = self.file._preserve_times(self.file.filename, self._modify_testfile)
# HERE an external access to the file is possible, modifying its access time
# read times again and compare with original
st = os.stat(self.file.filename)
(after_atime_ns, after_mtime_ns) = (st.st_atime_ns, st.st_mtime_ns)
# on macOS 10.14 and later os.utime only sets the times with second
# precision see https://tickets.metabrainz.org/browse/PICARD-1516.
# This also seems to depend on the Python build being used.
if IS_MACOS:
before_atime_ns //= 1000
before_mtime_ns //= 1000
after_atime_ns //= 1000
after_mtime_ns //= 1000
# modification times should be equal
self.assertEqual(before_mtime_ns, after_mtime_ns)
# access times may not be equal
# time difference should be positive and reasonably low (if no access in between, it should be 0)
delta = after_atime_ns - before_atime_ns
tolerance = 10**7 # 0.01 seconds
self.assertTrue(0 <= delta < tolerance, "0 <= %s < %s" % (delta, tolerance))
# ensure written data can be read back
# keep it at the end, we don't want to access file before time checks
self.assertEqual(self._read_testfile(), 'xxxyyy')
def test_preserve_times_nofile(self):
with self.assertRaises(self.file.PreserveTimesStatError):
self.file._preserve_times(self.file.filename,
self._modify_testfile)
with self.assertRaises(FileNotFoundError):
self._read_testfile()
def test_preserve_times_nofile_utime(self):
self._create_testfile()
def save():
os.remove(self.file.filename)
with self.assertRaises(self.file.PreserveTimesUtimeError):
self.file._preserve_times(self.file.filename, save)
class TestPreserveTimes(PicardTestCase):
def setUp(self):
super().setUp()
self.tmp_directory = mkdtemp()
filepath = os.path.join(self.tmp_directory, 'a.mp3')
self.file = File(filepath)
def tearDown(self):
shutil.rmtree(self.tmp_directory)
def _create_testfile(self):
# create a dummy file
with open(self.file.filename, 'w') as f:
f.write('xxx')
f.flush()
os.fsync(f.fileno())
def _modify_testfile(self):
# dummy file modification, append data to it
with open(self.file.filename, 'a') as f:
f.write('yyy')
f.flush()
os.fsync(f.fileno())
def _read_testfile(self):
with open(self.file.filename, 'r') as f:
return f.read()
def test_preserve_times(self):
self._create_testfile()
# test if times are preserved
(before_atime_ns, before_mtime_ns) = self.file._preserve_times(self.file.filename, self._modify_testfile)
# HERE an external access to the file is possible, modifying its access time
# read times again and compare with original
st = os.stat(self.file.filename)
(after_atimes_ns, after_mtimes_ns) = (st.st_atime_ns, st.st_mtime_ns)
# modification times should be equal
self.assertEqual(before_mtime_ns, after_mtimes_ns)
# access times may not be equal
# time difference should be positive and reasonably low (if no access in between, it should be 0)
delta = after_atimes_ns - before_atime_ns
tolerance = 10**7 # 0.01 seconds
self.assertTrue(0 <= delta < tolerance)
# ensure written data can be read back
# keep it at the end, we don't want to access file before time checks
self.assertEqual(self._read_testfile(), 'xxxyyy')
def test_preserve_times_nofile(self):
with self.assertRaises(self.file.PreserveTimesStatError):
self.file._preserve_times(self.file.filename,
self._modify_testfile)
with self.assertRaises(FileNotFoundError):
self._read_testfile()
def test_preserve_times_nofile_utime(self):
self._create_testfile()
def save():
os.remove(self.file.filename)
with self.assertRaises(self.file.PreserveTimesUtimeError):
result = self.file._preserve_times(self.file.filename, save)
