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discover.cpython-39.pyc
a 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 0 dS )z� Returns result of calling ``func`` on ``args``, ``kwargs``. Returns None if ``func`` raises :exc:`DeviceNotFoundError`. Nr )�args�kwargs��func� �3/usr/lib/python3.9/site-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 s t � �dS )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 N��NotImplementedError��cls�valuer r r �matchD s zHypothesis.matchc C s t � �dS )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` Nr )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�}|�|�}|o6t�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+)$�major�minor)�re�compiler �os�makedev�int�group)r r Zmajor_minor_rer r r r �_match_major_minor� s �z)DeviceNumberHypothesis._match_major_minorc C s& t �d�}|�|�}|o$t|�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+)$Znumber)r+ r, r r/ r0 )r r Z number_rer r r r � _match_number� s z$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 )r1 r2 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 r4 r r r �find_subsystems� s z&DeviceNumberHypothesis.find_subsystemsc s8 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 s | ]}�� |��V qd S �Nr ��.0�s�r r r r r � <genexpr>� � z0DeviceNumberHypothesis.lookup.<locals>.<genexpr>c s s | ]}|d ur|V qd S r9 r �r; �rr r r r> � r? )r r Zfrom_device_numberr8 r �r r r �resr r= r r � s z DeviceNumberHypothesis.lookupN) r! r" r# r$ r% r1 r2 r r8 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 |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 � s zDevicePathHypothesis.matchc C s( t tj�||�}|dur"t|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 Z from_pathr rB r r r r � s zDevicePathHypothesis.lookupN)r! r" r# r$ r% r r r r r r rD � s rD 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 )Zbus�classZ subsystemc 3 s | ]}t j�� |�V qd S r9 �r- r6 r7 )r; �name�r4 r r r> � r? z7DeviceNameHypothesis.find_subsystems.<locals>.<genexpr>c s s | ]}t j�|�r|V qd S r9 )r- r6 �isdir�r; �dr r r r> � r? c s s" | ]}t �|�D ] }|V qqd S r9 )r- r5 )r; rM �nr r r r> � r? )r4 r )r r �dirnamesZabsnamesZ realnamesr rJ r r8 � s z$DeviceNameHypothesis.find_subsystemsc C s |S )z� Match ``value`` under the assumption that it is a device name. :returns: the device path or None :rtype: str or NoneType r r r r r r � s zDeviceNameHypothesis.matchc s8 t tj��� ��fdd�| �� �D �}tdd� |D ��S )rE c 3 s | ]}�� |��V qd S r9 r r: r= r r r> r? z.DeviceNameHypothesis.lookup.<locals>.<genexpr>c s s | ]}|d ur|V qd S r9 r r@ r r r r> r? )r r � from_namer8 r rB r r= r r s zDeviceNameHypothesis.lookupN)r! r" r# r$ r% r8 r r r r r r rF � s rF 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 r9 )�list� device_linksrL r r r r> * r? z5DeviceFileHypothesis.get_link_dirs.<locals>.<genexpr>c s s | ]}|j D ] }|V q qd S r9 )rS )r; rM �lr r r r> + r? c s s | ]}t j�|�V qd S r9 )r- r6 �dirname)r; rT r r r r> , r? )Z list_devices�sorted�set)r r �devicesZdevices_with_linksZlinksr 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)rY � _LINK_DIRSr r r r r . s zDeviceFileHypothesis.setupc C s |S r9 r r r r r r 9 s zDeviceFileHypothesis.matchc sn t tj��d�v r4�� ��}|dur.t|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 r9 rH )r; Zld)r r r r> P r? z.DeviceFileHypothesis.lookup.<locals>.<genexpr>c 3 s | ]}�� |�V qd S r9 r )r; �f)r r r r r> Q r? c s s | ]}|d ur|V qd S r9 r rL r r r r> R r? )r r Zfrom_device_filer rZ )r r r Zdevice�filesrX r r= r r = s zDeviceFileHypothesis.lookupN) r! r" r# r$ rZ r% rY r r r r r r r rQ s rQ c @ s4 e Zd ZdZeeeegZdd� Z dd� Z dd� Z dS ) � Discoveryz1 Provides discovery methods for devices. c C s | j | _d S r9 )� _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)r` r )ra r Zhypr 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 qqd S r9 )r )r; �hrM �r r r r r> w s z(Discovery.get_devices.<locals>.<genexpr>)r r` )ra r r r rd r r n s �zDiscovery.get_devicesN) r! r" r# r$ rQ rF r( rD r_ rb r r r r r r r^ U s � r^ )r$ Z __future__r r r r r& r r- r+ ZsixZpyudev._errorsr Z pyudev.devicer r Z add_metaclass�ABCMeta�objectr r( rD rF rQ r^ r r r r �<module> s& =G /F
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