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discover.cpython-310.pyc
o 8g+^w, � @ s� d Z ddlmZ ddlmZ ddlmZ ddlmZ ddlZddlZddlZddl Z ddl Z ddl m Z ddl mZ d d � Ze �ej�G d d � d e��ZG d d� de�ZG dd� de�ZG dd� de�ZG dd� de�ZG dd� de�ZdS )z� pyudev.discover =============== Tools to discover a device given limited information. .. moduleauthor:: mulhern <amulhern@redhat.com> � )�absolute_import)�division)�print_function)�unicode_literalsN��DeviceNotFoundError)�Devicesc s t �� �� fdd��}|S )z\ Allow Device discovery methods to return None instead of raising an exception. c s& z� | i |��W S t y Y dS w )z� Returns result of calling ``func`` on ``args``, ``kwargs``. Returns None if ``func`` raises :exc:`DeviceNotFoundError`. Nr )�args�kwargs��func� �1/usr/lib/python3/dist-packages/pyudev/discover.py�the_func0 s �z wrap_exception.<locals>.the_func)� functools�wraps)r r r r r �wrap_exception* s r c @ sL e Zd ZdZeejdd� ��Zeejdd� ��Zedd� �Z edd � �Z d S ) � HypothesiszM Represents a hypothesis about the meaning of the device identifier. c C � t � �)a� Match the given string according to the hypothesis. The purpose of this method is to obtain a value corresponding to ``value`` if that is possible. It may use a regular expression, but in general it should just return ``value`` and let the lookup method sort out the rest. :param str value: the string to inspect :returns: the matched thing or None if unmatched :rtype: the type of lookup's key parameter or NoneType ��NotImplementedError��cls�valuer r r �matchD s zHypothesis.matchc C r )aN Lookup the given string according to the hypothesis. :param Context context: the pyudev context :param key: a key with which to lookup the device :type key: the type of match's return value if not None :returns: a list of Devices obtained :rtype: frozenset of :class:`Device` r )r �context�keyr r r �lookupU s zHypothesis.lookupc C s dS )z� A potentially expensive method that may allow an :class:`Hypothesis` to find devices more rapidly or to find a device that it would otherwise miss. :param Context context: the pyudev context Nr �r r r r r �setupc s zHypothesis.setupc C s$ | � |�}|dur| �||�S t� S )a Get any devices that may correspond to the given string. :param Context context: the pyudev context :param str value: the value to look for :returns: a list of devices obtained :rtype: set of :class:`Device` N)r r � frozenset)r r r r r r r � get_devicesn s zHypothesis.get_devicesN) �__name__� __module__� __qualname__�__doc__� classmethod�abc�abstractmethodr r r r! r r r r r > s r c @ sL e Zd ZdZedd� �Zedd� �Zedd� �Zedd � �Zed d � �Z d S ) �DeviceNumberHypothesisz� Represents the hypothesis that the device is a device number. The device may be separated into major/minor number or a composite number. c C s8 t �d�}|�|�}|ot�t|�d��t|�d���S )z� Match the number under the assumption that it is a major,minor pair. :param str value: value to match :returns: the device number or None :rtype: int or NoneType z#^(?P<major>\d+)(\D+)(?P<minor>\d+)$�major�minor)�re�compiler �os�makedev�int�group)r r �major_minor_rer r r r �_match_major_minor� s �z)DeviceNumberHypothesis._match_major_minorc C s& t �d�}|�|�}|ot|�d��S )z� Match the number under the assumption that it is a single number. :param str value: value to match :returns: the device number or None :rtype: int or NoneType z^(?P<number>\d+)$�number)r, r- r r0 r1 )r r � number_rer r r r � _match_number� s z$DeviceNumberHypothesis._match_numberc C s | � |�p | �|�S )z� Match the number under the assumption that it is a device number. :returns: the device number or None :rtype: int or NoneType )r3 r6 r r r r r � s z DeviceNumberHypothesis.matchc C s |j }t�tj�|d��S )z� Find subsystems in /sys/dev. :param Context context: the context :returns: a lis of available subsystems :rtype: list of str �dev)�sys_pathr. �listdir�path�join)r r r8 r r r �find_subsystems� s z&DeviceNumberHypothesis.find_subsystemsc �8 t tj��� ��fdd�| �� �D �}tdd� |D ��S )z� Lookup by the device number. :param Context context: the context :param int key: the device number :returns: a list of matching devices :rtype: frozenset of :class:`Device` c 3 � � | ] }�� |��V qd S �Nr ��.0�s�r r r r r � <genexpr>� � � z0DeviceNumberHypothesis.lookup.<locals>.<genexpr>c s � � | ] }|d ur|V qd S r? r �rA �rr r r rD � rE )r r �from_device_numberr< r �r r r �resr rC r r � � z DeviceNumberHypothesis.lookupN) r" r# r$ r% r& r3 r6 r r< r r r r r r) | s r) c @ s( e Zd ZdZedd� �Zedd� �ZdS )�DevicePathHypothesiszG Discover the device assuming the identifier is a device path. c C � |S )z� Match ``value`` under the assumption that it is a device path. :returns: the device path or None :rtype: str or NoneType r r r r r r � � zDevicePathHypothesis.matchc C s( t tj�||�}|durt|f�S t� S )�� Lookup by the path. :param Context context: the context :param str key: the device path :returns: a list of matching devices :rtype: frozenset of :class:`Device` N)r r � from_pathr rJ r r r r � s zDevicePathHypothesis.lookupN)r" r# r$ r% r& r r r r r r rM � s rM c @ s4 e Zd ZdZedd� �Zedd� �Zedd� �ZdS ) �DeviceNameHypothesiszf Discover the device assuming the input is a device name. Try every available subsystem. c s< |j � d}� fdd�|D �}dd� |D �}tdd� |D ��S )z� Find all subsystems in sysfs. :param Context context: the context :rtype: frozenset :returns: subsystems in sysfs )�bus�class� subsystemc 3 s � | ] }t j�� |�V qd S r? �r. r: r; )rA �name�r8 r r rD � � � z7DeviceNameHypothesis.find_subsystems.<locals>.<genexpr>c s s � | ] }t j�|�r|V qd S r? )r. r: �isdir�rA �dr r r rD � � � c s s$ � | ] }t �|�D ]}|V q qd S r? )r. r9 )rA r\ �nr r r rD � s �" )r8 r )r r �dirnames�absnames� realnamesr rX r r< � s z$DeviceNameHypothesis.find_subsystemsc C rN )z� Match ``value`` under the assumption that it is a device name. :returns: the device path or None :rtype: str or NoneType r r r r r r � rO zDeviceNameHypothesis.matchc r= )rP c 3 r> r? r r@ rC r r rD rE z.DeviceNameHypothesis.lookup.<locals>.<genexpr>c s rF r? r rG r r r rD rE )r r � from_namer< r rJ r rC r r rL zDeviceNameHypothesis.lookupN)r" r# r$ r% r& r< r r r r r r rR � s rR c @ sH e Zd ZdZg d�Zedd� �Zedd� �Zedd� �Zed d � �Z d S ) �DeviceFileHypothesisz� Discover the device assuming the value is some portion of a device file. The device file may be a link to a device node. ) z/devz/dev/disk/by-idz/dev/disk/by-labelz/dev/disk/by-partlabelz/dev/disk/by-partuuidz/dev/disk/by-pathz/dev/disk/by-uuidz/dev/input/by-pathz /dev/mapperz/dev/mdz/dev/vgc C s: |� � }dd� |D �}dd� |D �}ttdd� |D ���S )a7 Get all directories that may contain links to device nodes. This method checks the device links of every device, so it is very expensive. :param Context context: the context :returns: a sorted list of directories that contain device links :rtype: list c s s � | ] }t |j�r|V qd S r? )�list� device_linksr[ r r r rD * rY z5DeviceFileHypothesis.get_link_dirs.<locals>.<genexpr>c s s � | ] }|j D ]}|V qqd S r? )re )rA r\ �lr r r rD + r] c s s � | ] }t j�|�V qd S r? )r. r: �dirname)rA rf r r r rD , rE )� list_devices�sorted�set)r r �devices�devices_with_links�linksr r r � get_link_dirs s z"DeviceFileHypothesis.get_link_dirsc C s | � |�| _dS )z� Set the link directories to be used when discovering by file. Uses `get_link_dirs`, so is as expensive as it is. :param Context context: the context N)rn � _LINK_DIRSr r r r r . s zDeviceFileHypothesis.setupc C rN r? r r r r r r 9 s zDeviceFileHypothesis.matchc sn t tj��d�v r�� ��}|durt|f�S t� S �fdd�| jD �}� �fdd�|D �}tdd� |D ��S )a� Lookup the device under the assumption that the key is part of the name of a device file. :param Context context: the context :param str key: a portion of the device file name It is assumed that either it is the whole name of the device file or it is the basename. A device file may be a device node or a device link. �/Nc 3 s � | ] }t j�|� �V qd S r? rV )rA �ld)r r r rD P rY z.DeviceFileHypothesis.lookup.<locals>.<genexpr>c 3 s � | ]}�� |�V qd S r? r )rA �f)r r r r rD Q s � c s rF r? r r[ r r r rD R rE )r r �from_device_filer ro )r r r �device�filesrk r rC r r = s zDeviceFileHypothesis.lookupN) r" r# r$ r% ro r& rn r r r r r r r rc s rc c @ s4 e Zd ZdZeeeegZdd� Z dd� Z dd� Z dS ) � Discoveryz1 Provides discovery methods for devices. c C s | j | _d S r? )� _HYPOTHESES� _hypotheses)�selfr r r �__init__` s zDiscovery.__init__c C s | j D ]}|�|� qdS )z Set up individual hypotheses. May be an expensive call. :param Context context: the context N)rx r )ry r �hypr r r r c s �zDiscovery.setupc s t � �fdd�| jD ��S )z� Get the devices corresponding to value. :param Context context: the context :param str value: some identifier of the device :returns: a list of corresponding devices :rtype: frozenset of :class:`Device` c 3 s& � | ]}|� � ��D ]}|V q qd S r? )r! )rA �hr\ �r r r r rD w s � � �z(Discovery.get_devices.<locals>.<genexpr>)r rx )ry r r r r} r r! n s �zDiscovery.get_devicesN) r" r# r$ r% rc rR r) rM rw rz r r! r r r r rv U s � rv )r% � __future__r r r r r' r r. r, �six�pyudev._errorsr � pyudev.devicer r � add_metaclass�ABCMeta�objectr r) rM rR rc rv r r r r �<module> s( =G /F
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