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pyudev.discover
===============
Tools to discover a device given limited information.
.. moduleauthor:: mulhern <amulhern@redhat.com>
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Allow Device discovery methods to return None instead of raising an
exception.
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Returns result of calling ``func`` on ``args``, ``kwargs``.
Returns None if ``func`` raises :exc:`DeviceNotFoundError`.
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r c @ sL e Zd ZdZeejdd� ��Zeejdd� ��Zedd� �Z edd � �Z
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HypothesiszM
Represents a hypothesis about the meaning of the device identifier.
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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
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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`
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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
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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`
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�DeviceNumberHypothesisz�
Represents the hypothesis that the device is a device number.
The device may be separated into major/minor number or a composite number.
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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
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Match the number under the assumption that it is a single number.
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Match the number under the assumption that it is a device number.
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:rtype: int or NoneType
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Find subsystems in /sys/dev.
:param Context context: the context
:returns: a lis of available subsystems
:rtype: list of str
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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
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Discover the device assuming the identifier is a device path.
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Match ``value`` under the assumption that it is a device path.
:returns: the device path or None
:rtype: str or NoneType
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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`
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rM c @ s4 e Zd ZdZedd� �Zedd� �Zedd� �ZdS ) �DeviceNameHypothesiszf
Discover the device assuming the input is a device name.
Try every available subsystem.
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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
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Match ``value`` under the assumption that it is a device name.
:returns: the device path or None
:rtype: str or NoneType
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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
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r rD * rY z5DeviceFileHypothesis.get_link_dirs.<locals>.<genexpr>c s s � | ] }|j D ]}|V qqd S r? )re )rA r\ �lr
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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
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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.
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Provides discovery methods for devices.
c C s | j | _d S r? )� _HYPOTHESES� _hypotheses)�selfr
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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
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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`
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