def test_get_device_type_no_device_file(tmpdir):
filename = tmpdir.join('test')
filename.ensure(file=True)
with pytest.raises(ValueError) as excinfo:
_util.get_device_type(str(filename))
message = 'not a device file: {0!r}'.format(str(filename))
assert str(excinfo.value) == message
def test_get_device_type_no_device_file(tmpdir):
filename = tmpdir.join('test')
filename.ensure(file=True)
with pytest.raises(ValueError) as excinfo:
_util.get_device_type(str(filename))
message = 'not a device file: {0!r}'.format(str(filename))
assert str(excinfo.value) == message
def test_get_device_type_not_existing(tmpdir):
"""
Test that an OSError is raised when checking device type using a file
that does not actually exist.
"""
filename = tmpdir.join('test_get_device_type_not_existing')
assert not tmpdir.check(file=True)
with pytest.raises(OSError):
_util.get_device_type(str(filename))
def test_get_device_type_not_existing(tmpdir):
"""
Test that an OSError is raised when checking device type using a file
that does not actually exist.
"""
filename = tmpdir.join('test_get_device_type_not_existing')
assert not tmpdir.check(file=True)
with pytest.raises(OSError):
_util.get_device_type(str(filename))
def from_device_file(cls, context, filename):
"""
Create a new device from the given device file:
>>> context = Context()
>>> device = Device.from_device_file(context, '/dev/sda')
>>> device
Device(u'/sys/devices/pci0000:00/0000:00:0d.0/host2/target2:0:0/2:0:0:0/block/sda')
>>> device.device_node
u'/dev/sda'
.. warning::
Though the example seems to suggest that ``device.device_node ==
filename`` holds with ``device = Device.from_device_file(context,
filename)``, this is only true in a majority of cases. There *can*
be devices, for which this relation is actually false! Thus, do
*not* expect :attr:`~Device.device_node` to be equal to the given
``filename`` for the returned :class:`Device`. Especially, use
:attr:`~Device.device_node` if you need the device file of a
:class:`Device` created with this method afterwards.
``context`` is the :class:`Context` in which to search the device.
``filename`` is a string containing the path of a device file.
Return a :class:`Device` representing the given device file. Raise
:exc:`~exceptions.ValueError` if ``filename`` is no device file at all.
Raise :exc:`~exceptions.EnvironmentError` if ``filename`` does not
exist or if its metadata was inaccessible.
.. versionadded:: 0.15
"""
device_type = get_device_type(filename)
device_number = os.stat(filename).st_rdev
return cls.from_device_number(context, device_type, device_number)
def from_device_file(cls, context, filename):
"""
Create a new device from the given device file:
>>> from pyudev import Context, Device
>>> context = Context()
>>> device = Devices.from_device_file(context, '/dev/sda')
>>> device
Device(u'/sys/devices/pci0000:00/0000:00:0d.0/host2/target2:0:0/2:0:0:0/block/sda')
>>> device.device_node
u'/dev/sda'
.. warning::
Though the example seems to suggest that ``device.device_node ==
filename`` holds with ``device = Devices.from_device_file(context,
filename)``, this is only true in a majority of cases. There *can*
be devices, for which this relation is actually false! Thus, do
*not* expect :attr:`~Device.device_node` to be equal to the given
``filename`` for the returned :class:`Device`. Especially, use
:attr:`~Device.device_node` if you need the device file of a
:class:`Device` created with this method afterwards.
``context`` is the :class:`Context` in which to search the device.
``filename`` is a string containing the path of a device file.
Return a :class:`Device` representing the given device file. Raise
:exc:`DeviceNotFoundByFileError` if ``filename`` is no device file
at all or if ``filename`` does not exist or if its metadata was
inaccessible.
.. versionadded:: 0.18
"""
try:
device_type = get_device_type(filename)
device_number = os.stat(filename).st_rdev
except (EnvironmentError, ValueError) as err:
raise DeviceNotFoundByFileError(err)
return cls.from_device_number(context, device_type, device_number)
def test_get_device_type_block_device(a_device):
"""
Check that the device type of a block device is actually block.
"""
assert _util.get_device_type(a_device.device_node) == 'block'
def test_get_device_type_character_device(a_device):
"""
Check that the device type of a character device is actually char.
"""
assert _util.get_device_type(a_device.device_node) == 'char'
def test_get_device_type_not_existing(tmpdir):
filename = tmpdir.join('test')
assert not tmpdir.check(file=True)
with pytest.raises(EnvironmentError) as excinfo:
_util.get_device_type(str(filename))
pytest.assert_env_error(excinfo.value, errno.ENOENT, str(filename))
def test_get_device_type_block_device():
assert _util.get_device_type('/dev/sda') == 'block'
def test_get_device_type_character_device():
assert _util.get_device_type('/dev/console') == 'char'
def test_get_device_type_block_device(a_device):
"""
Check that the device type of a block device is actually block.
"""
assert _util.get_device_type(a_device.device_node) == 'block'
def test_get_device_type_character_device(a_device):
"""
Check that the device type of a character device is actually char.
"""
assert _util.get_device_type(a_device.device_node) == 'char'
def test_get_device_type_block_device():
try:
assert _util.get_device_type("/dev/sda") == "block"
except EnvironmentError:
pytest.skip("device node not found")
def test_get_device_type_character_device():
assert _util.get_device_type("/dev/console") == "char"
def test_get_device_type_block_device():
try:
assert _util.get_device_type('/dev/sda') == 'block'
except EnvironmentError:
pytest.skip('device node not found')
