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    pyudev.device._device
    =====================

    Device class implementation of :mod:`pyudev`.

    .. moduleauthor::  Sebastian Wiesner  <lunaryorn@gmail.com>
�)�absolute_import)�division)�print_function)�unicode_literalsN)�	timedelta�collections_abc�collections)�r	zcollections.abc)r)�DeviceNotFoundAtPathError)�DeviceNotFoundByFileError)�#DeviceNotFoundByInterfaceIndexError)�!DeviceNotFoundByKernelDeviceError)�DeviceNotFoundByNameError)�DeviceNotFoundByNumberError)� DeviceNotFoundInEnvironmentError)�ensure_byte_string)�ensure_unicode_string)�get_device_type��string_to_bool)�udev_list_iteratec@s|eZdZdZedd��Zedd��Zedd��Zedd	��Zed
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    Class for constructing :class:`Device` objects from various kinds of data.
    cCs0|�|j�s$tj�|j|�tj��}|�||�S)a�
        Create a device from a device ``path``.  The ``path`` may or may not
        start with the ``sysfs`` mount point:

        >>> from pyudev import Context, Device
        >>> context = Context()
        >>> Devices.from_path(context, '/devices/platform')
        Device(u'/sys/devices/platform')
        >>> Devices.from_path(context, '/sys/devices/platform')
        Device(u'/sys/devices/platform')

        ``context`` is the :class:`Context` in which to search the device.
        ``path`` is a device path as unicode or byte string.

        Return a :class:`Device` object for the device.  Raise
        :exc:`DeviceNotFoundAtPathError`, if no device was found for ``path``.

        .. versionadded:: 0.18
        )�
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        Create a new device from a given ``sys_path``:

        >>> from pyudev import Context, Device
        >>> context = Context()
        >>> Devices.from_sys_path(context, '/sys/devices/platform')
        Device(u'/sys/devices/platform')

        ``context`` is the :class:`Context` in which to search the device.
        ``sys_path`` is a unicode or byte string containing the path of the
        device inside ``sysfs`` with the mount point included.

        Return a :class:`Device` object for the device.  Raise
        :exc:`DeviceNotFoundAtPathError`, if no device was found for
        ``sys_path``.

        .. versionadded:: 0.18
        )�_libudevZudev_device_new_from_syspathrr
�Device)r r!r�devicer"r"r#rZs�zDevices.from_sys_pathcCs<|�dd�}|j�|t|�t|��}|s2t||��t||�S)a.
        Create a new device from a given ``subsystem`` and a given
        ``sys_name``:

        >>> from pyudev import Context, Device
        >>> context = Context()
        >>> sda = Devices.from_name(context, 'block', 'sda')
        >>> sda
        Device(u'/sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda')
        >>> sda == Devices.from_path(context, '/block/sda')

        ``context`` is the :class:`Context` in which to search the device.
        ``subsystem`` and ``sys_name`` are byte or unicode strings, which
        denote the subsystem and the name of the device to create.

        Return a :class:`Device` object for the device.  Raise
        :exc:`DeviceNotFoundByNameError`, if no device was found with the given
        name.

        .. versionadded:: 0.18
        �/�!)�replacer%Z&udev_device_new_from_subsystem_sysnamerrr&)r r!�	subsystem�sys_namer'r"r"r#�	from_namets�
zDevices.from_namecCs0|j�|t|d�|�}|s&t||��t||�S)a�
        Create a new device from a device ``number`` with the given device
        ``type``:

        >>> import os
        >>> from pyudev import Context, Device
        >>> ctx = Context()
        >>> major, minor = 8, 0
        >>> device = Devices.from_device_number(context, 'block',
        ...     os.makedev(major, minor))
        >>> device
        Device(u'/sys/devices/pci0000:00/0000:00:11.0/host0/target0:0:0/0:0:0:0/block/sda')
        >>> os.major(device.device_number), os.minor(device.device_number)
        (8, 0)

        Use :func:`os.makedev` to construct a device number from a major and a
        minor device number, as shown in the example above.

        .. warning::

           Device numbers are not unique across different device types.
           Passing a correct number with a wrong type may silently yield a
           wrong device object, so make sure to pass the correct device type.

        ``context`` is the :class:`Context`, in which to search the device.
        ``type`` is either ``'char'`` or ``'block'``, according to whether the
        device is a character or block device.  ``number`` is the device number
        as integer.

        Return a :class:`Device` object for the device with the given device
        ``number``.  Raise :exc:`DeviceNotFoundByNumberError`, if no device was
        found with the given device type and number.

        .. versionadded:: 0.18
        r)r%Zudev_device_new_from_devnumrrr&)r r!�typ�numberr'r"r"r#�from_device_number�s%�
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        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
        N)rr�stat�st_rdev�EnvironmentError�
ValueErrorrr0)r r!�filename�device_type�
device_number�errr"r"r#�from_device_file�s"zDevices.from_device_filecs<|jdd�}t�fdd�|D�d�}|dur0|St���dS)a?
        Locate a device based on the interface index.

        :param `Context` context: the libudev context
        :param int ifindex: the interface index
        :returns: the device corresponding to the interface index
        :rtype: `Device`

        This method is only appropriate for network devices.
        Znet)r+c3s"|]}|j�d��kr|VqdS)�ifindexN)�
attributes�get)�.0�d�r:r"r#�	<genexpr>�s�z/Devices.from_interface_index.<locals>.<genexpr>N)�list_devices�nextr)r r!r:Znetwork_devices�devr"r?r#�from_interface_index�s�zDevices.from_interface_indexcCs�|d}|dd�}|dvrlt�d�}|�|�}|rbt�t|�d��t|�d���}|�|||�St|��nT|dkr�|�	||�S|d	kr�|�
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        Locate a device based on the kernel device.

        :param `Context` context: the libudev context
        :param str kernel_device: the kernel device
        :returns: the device corresponding to ``kernel_device``
        :rtype: `Device`
        r�N)�b�cz^(?P<major>\d+):(?P<minor>\d+)$�major�minor�n�+�:)�re�compile�matchr�makedev�int�groupr0r
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        Create a new device from the process environment (as in
        :data:`os.environ`).

        This only works reliable, if the current process is called from an
        udev rule, and is usually used for tools executed from ``IMPORT=``
        rules.  Use this method to create device objects in Python scripts
        called from udev rules.

        ``context`` is the library :class:`Context`.

        Return a :class:`Device` object constructed from the environment.
        Raise :exc:`DeviceNotFoundInEnvironmentError`, if no device could be
        created from the environment.

        .. udevversion:: 152

        .. versionadded:: 0.18
        )r%Z udev_device_new_from_environmentrr&)r r!r'r"r"r#�from_environmentszDevices.from_environmentcCs|j|j|j|j|jgS)z�
        Return methods that obtain a :class:`Device` from a variety of
        different data.

        :return: a list of from_* methods.
        :rtype: list of class methods

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        )r9r0r-r$r)r r"r"r#�METHODS6s�zDevices.METHODSN)�__name__�
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edd��Zedd��Zedd��ZdYdd�Zdd�Zedd ��Zed!d"��Zed#d$��Zed%d&��Zed'd(��Zed)d*��Zed+d,��Zed-d.��Zed/d0��Zed1d2��Zed3d4��Zed5d6��Zed7d8��Z ed9d:��Z!ed;d<��Z"ed=d>��Z#ed?d@��Z$dAdB�Z%dCdD�Z&dEdF�Z'dGdH�Z(dIdJ�Z)dKdL�Z*dMdN�Z+dOdP�Z,dQdR�Z-dSdT�Z.dUdV�Z/dWdX�Z0dS)Zr&a�
    A single device with attached attributes and properties.

    A device also has a set of udev-specific attributes like the path
    inside ``sysfs``.

    :class:`Device` objects compare equal and unequal to other devices and
    to strings (based on :attr:`device_path`).  However, there is no
    ordering on :class:`Device` objects, and the corresponding operators
    ``>``, ``<``, ``<=`` and ``>=`` raise :exc:`~exceptions.TypeError`.

    .. warning::

       Currently, Device extends Mapping. The mapping that it stores is that
       of udev property names to udev property values. This use is deprecated
       and Device will no longer extend Mapping in 1.0. To look up udev
       properties, use the Device.properties property.

    .. warning::

       **Never** use object identity (``is`` operator) to compare
       :class:`Device` objects.  :mod:`pyudev` may create multiple
       :class:`Device` objects for the same device.  Instead compare
       devices by value using ``==`` or ``!=``.

    :class:`Device` objects are hashable and can therefore be used as keys
    in dictionaries and sets.

    They can also be given directly as ``udev_device *`` to functions wrapped
    through :mod:`ctypes`.
    cCs$ddl}|jdtdd�t�||�S)zw
        .. versionadded:: 0.4
        .. deprecated:: 0.18
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stacklevel)�warnings�warn�DeprecationWarningrr$)r r!rrbr"r"r#r$is�zDevice.from_pathcCs$ddl}|jdtdd�t�||�S)a|
        .. versionchanged:: 0.4
           Raise :exc:`NoSuchDeviceError` instead of returning ``None``, if
           no device was found for ``sys_path``.
        .. versionchanged:: 0.5
           Raise :exc:`DeviceNotFoundAtPathError` instead of
           :exc:`NoSuchDeviceError`.
        .. deprecated:: 0.18
           Use :class:`Devices.from_sys_path` instead.
        rNr^r_r`)rbrcrdrr)r r!rrbr"r"r#rws�zDevice.from_sys_pathcCs&ddl}|jdtdd�t�|||�S)zw
        .. versionadded:: 0.5
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        .. versionadded:: 0.11
        .. deprecated:: 0.18
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        rNr^r_r`)rbrcrdrr0)r r!r.r/rbr"r"r#r0�s�zDevice.from_device_numbercCs$ddl}|jdtdd�t�||�S)z
        .. versionadded:: 0.15
        .. deprecated:: 0.18
           Use :class:`Devices.from_device_file` instead.
        rNr^r_r`)rbrcrdrr9)r r!r5rbr"r"r#r9�s�zDevice.from_device_filecCs"ddl}|jdtdd�t�|�S)z~
        .. versionadded:: 0.6
        .. deprecated:: 0.18
           Use :class:`Devices.from_environment` instead.
        rNr^r_r`)rbrcrdrrW)r r!rbr"r"r#rW�s�zDevice.from_environmentcCs$tj�|�||_||_|j|_dS�N)r�Mapping�__init__r!Z_as_parameter_r%)�selfr!Z_devicer"r"r#rg�szDevice.__init__cCs|j�|�dSre)r%Zudev_device_unref�rhr"r"r#�__del__�szDevice.__del__cCs
d�|�S)NzDevice({0.sys_path!r}))�formatrir"r"r#�__repr__�szDevice.__repr__cCs(|j�|�}|sdSt|j|j�|��S)z_
        The parent :class:`Device` or ``None``, if there is no parent
        device.
        N)r%Zudev_device_get_parentr&r!�udev_device_ref�rh�parentr"r"r#ro�sz
Device.parentccs(|j���|�D]}||kr|VqdS)a�
        Yield all direct children of this device.

        .. note::

           In udev, parent-child relationships are generally ambiguous, i.e.
           a parent can have multiple children, *and* a child can have multiple
           parents. Hence, `child.parent == parent` does generally *not* hold
           for all `child` objects in `parent.children`. In other words,
           the :attr:`parent` of a device in this property can be different
           from this device!

        .. note::

           As the underlying library does not provide any means to directly
           query the children of a device, this property performs a linear
           search through all devices.

        Return an iterable yielding a :class:`Device` object for each direct
        child of this device.

        .. udevversion:: 172

        .. versionchanged:: 0.13
           Requires udev version 172 now.
        N)r!rAZmatch_parent�rhr'r"r"r#�children�szDevice.childrenccs |j}|dur|V|j}qdS)z�
        Yield all ancestors of this device from bottom to top.

        Return an iterator yielding a :class:`Device` object for each
        ancestor of this device from bottom to top.

        .. versionadded:: 0.16
        N)rornr"r"r#�	ancestors�s
zDevice.ancestorsNcCsDt|�}|durt|�}|j�|||�}|s0dSt|j|j�|��S)a�
        Find the parent device with the given ``subsystem`` and
        ``device_type``.

        ``subsystem`` is a byte or unicode string containing the name of the
        subsystem, in which to search for the parent.  ``device_type`` is a
        byte or unicode string holding the expected device type of the parent.
        It can be ``None`` (the default), which means, that no specific device
        type is expected.

        Return a parent :class:`Device` within the given ``subsystem`` and, if
        ``device_type`` is not ``None``, with the given ``device_type``, or
        ``None``, if this device has no parent device matching these
        constraints.

        .. versionadded:: 0.9
        N)rr%Z-udev_device_get_parent_with_subsystem_devtyper&r!rm)rhr+r6ror"r"r#�find_parent
s�zDevice.find_parentcCsddl}|jdtdd�|jS)a~
        Traverse all parent devices of this device from bottom to top.

        Return an iterable yielding all parent devices as :class:`Device`
        objects, *not* including the current device.  The last yielded
        :class:`Device` is the top of the device hierarchy.

        .. deprecated:: 0.16
           Will be removed in 1.0. Use :attr:`ancestors` instead.
        rNz5Will be removed in 1.0. Use Device.ancestors instead.r_r`)rbrcrdrr�rhrbr"r"r#�traverse&s�zDevice.traversecCst|j�|��S)zz
        Absolute path of this device in ``sysfs`` including the ``sysfs``
        mount point as unicode string.
        )rr%Zudev_device_get_syspathrir"r"r#r8s
�zDevice.sys_pathcCst|j�|��S)a
        Kernel device path as unicode string.  This path uniquely identifies
        a single device.

        Unlike :attr:`sys_path`, this path does not contain the ``sysfs``
        mount point.  However, the path is absolute and starts with a slash
        ``'/'``.
        )rr%Zudev_device_get_devpathrir"r"r#�device_pathAs

�zDevice.device_pathcCs |j�|�}|durdSt|�S)z�
        Name of the subsystem this device is part of as unicode string.

        :returns: name of subsystem if found, else None
        :rtype: unicode string or NoneType
        N)r%Zudev_device_get_subsystemr)rhZsubsysr"r"r#r+NszDevice.subsystemcCst|j�|��S)zF
        Device file name inside ``sysfs`` as unicode string.
        )rr%Zudev_device_get_sysnamerir"r"r#r,Ys
�zDevice.sys_namecCs |j�|�}|durt|�SdS)a�
        The trailing number of the :attr:`sys_name` as unicode string, or
        ``None``, if the device has no trailing number in its name.

        .. note::

           The number is returned as unicode string to preserve the exact
           format of the number, especially any leading zeros:

           >>> from pyudev import Context, Device
           >>> context = Context()
           >>> device = Devices.from_path(context, '/sys/devices/LNXSYSTM:00')
           >>> device.sys_number
           u'00'

           To work with numbers, explicitly convert them to ints:

           >>> int(device.sys_number)
           0

        .. versionadded:: 0.11
        N)r%Zudev_device_get_sysnumr)rhr/r"r"r#�
sys_numberaszDevice.sys_numbercCs |j�|�}|durdSt|�S)a�
        Device type as unicode string, or ``None``, if the device type is
        unknown.

        >>> from pyudev import Context
        >>> context = Context()
        >>> for device in context.list_devices(subsystem='net'):
        ...     '{0} - {1}'.format(device.sys_name, device.device_type or 'ethernet')
        ...
        u'eth0 - ethernet'
        u'wlan0 - wlan'
        u'lo - ethernet'
        u'vboxnet0 - ethernet'

        .. versionadded:: 0.10
        N)r%Zudev_device_get_devtyper)rhr6r"r"r#r6|szDevice.device_typecCs |j�|�}|durt|�SdS)z�
        The driver name as unicode string, or ``None``, if there is no
        driver for this device.

        .. versionadded:: 0.5
        N)r%Zudev_device_get_driverr)rh�driverr"r"r#rx�sz
Device.drivercCs |j�|�}|durt|�SdS)a�
        Absolute path to the device node of this device as unicode string or
        ``None``, if this device doesn't have a device node.  The path
        includes the device directory (see :attr:`Context.device_path`).

        This path always points to the actual device node associated with
        this device, and never to any symbolic links to this device node.
        See :attr:`device_links` to get a list of symbolic links to this
        device node.

        .. warning::

           For devices created with :meth:`from_device_file()`, the value of
           this property is not necessary equal to the ``filename`` given to
           :meth:`from_device_file()`.
        N)r%Zudev_device_get_devnoder)rhZnoder"r"r#�device_node�szDevice.device_nodecCs|j�|�S)a
        The device number of the associated device as integer, or ``0``, if no
        device number is associated.

        Use :func:`os.major` and :func:`os.minor` to decompose the device
        number into its major and minor number:

        >>> import os
        >>> from pyudev import Context, Device
        >>> context = Context()
        >>> sda = Devices.from_name(context, 'block', 'sda')
        >>> sda.device_number
        2048L
        >>> (os.major(sda.device_number), os.minor(sda.device_number))
        (8, 0)

        For devices with an associated :attr:`device_node`, this is the same as
        the ``st_rdev`` field of the stat result of the :attr:`device_node`:

        >>> os.stat(sda.device_node).st_rdev
        2048

        .. versionadded:: 0.11
        )r%Zudev_device_get_devnumrir"r"r#r7�szDevice.device_numbercCst|j�|��S)ai
        ``True``, if the device is initialized, ``False`` otherwise.

        A device is initialized, if udev has already handled this device and
        has set up device node permissions and context, or renamed a network
        device.

        Consequently, this property is only implemented for devices with a
        device node or for network devices.  On all other devices this property
        is always ``True``.

        It is *not* recommended, that you use uninitialized devices.

        .. seealso:: :attr:`time_since_initialized`

        .. udevversion:: 165

        .. versionadded:: 0.8
        )�boolr%Zudev_device_get_is_initializedrir"r"r#�is_initialized�szDevice.is_initializedcCs|j�|�}t|d�S)a�
        The time elapsed since initialization as :class:`~datetime.timedelta`.

        This property is only implemented on devices, which need to store
        properties in the udev database.  On all other devices this property is
        simply zero :class:`~datetime.timedelta`.

        .. seealso:: :attr:`is_initialized`

        .. udevversion:: 165

        .. versionadded:: 0.8
        )�microseconds)r%Z&udev_device_get_usec_since_initializedr)rhr|r"r"r#�time_since_initialized�s�zDevice.time_since_initializedccs0|j�|�}t|j|�D]\}}t|�VqdS)a�
        An iterator, which yields the absolute paths (including the device
        directory, see :attr:`Context.device_path`) of all symbolic links
        pointing to the :attr:`device_node` of this device.  The paths are
        unicode strings.

        UDev can create symlinks to the original device node (see
        :attr:`device_node`) inside the device directory.  This is often
        used to assign a constant, fixed device node to devices like
        removeable media, which technically do not have a constant device
        node, or to map a single device into multiple device hierarchies.
        The property provides access to all such symbolic links, which were
        created by UDev for this device.

        .. warning::

           Links are not necessarily resolved by
           :meth:`Devices.from_device_file()`. Hence do *not* rely on
           ``Devices.from_device_file(context, link).device_path ==
           device.device_path`` from any ``link`` in ``device.device_links``.
        N)r%Z#udev_device_get_devlinks_list_entryrr)rhZdevlinks�namerUr"r"r#�device_links�szDevice.device_linkscCs |j�|�}|durt|�SdS)a
        The device event action as string, or ``None``, if this device was not
        received from a :class:`Monitor`.

        Usual actions are:

        ``'add'``
          A device has been added (e.g. a USB device was plugged in)
        ``'remove'``
          A device has been removed (e.g. a USB device was unplugged)
        ``'change'``
          Something about the device changed (e.g. a device property)
        ``'online'``
          The device is online now
        ``'offline'``
          The device is offline now

        .. warning::

           Though the actions listed above are the most common, this property
           *may* return other values, too, so be prepared to handle unknown
           actions!

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