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3 u1‘Wô,ã@sìdZddlmZddlmZddlmZddlmZddlZddlZddlZddl Z ddl Z ddlmZddlm Z d d „Ze jejƒGdd„deƒƒZGd d„deƒZGdd„deƒZGdd„deƒZGdd„deƒZGdd„deƒZdS)zš pyudev.discover =============== Tools to discover a device given limited information. .. moduleauthor:: mulhern é)Úabsolute_import)Údivision)Úprint_function)Úunicode_literalsN)ÚDevices)ÚDeviceNotFoundErrorcstjˆƒ‡fdd„ƒ}|S)z\ Allow Device discovery methods to return None instead of raising an exception. cs$y ˆ||ŽStk rdSXdS)z‘ Returns result of calling ``func`` on ``args``, ``kwargs``. Returns None if ``func`` raises :exc:`DeviceNotFoundError`. N)r)ÚargsÚkwargs)Úfunc©ú/usr/lib/python3.6/discover.pyÚthe_func1s z wrap_exception..the_func)Ú functoolsÚwraps)r r r)r rÚwrap_exception+src@sLeZdZdZeejdd„ƒƒZeejdd„ƒƒZedd„ƒZ edd „ƒZ d S)Ú HypothesiszM Represents a hypothesis about the meaning of the device identifier. cCs tƒ‚dS)aì Match the given string according to the hypothesis. The purpose of this method is to obtain a value corresponding to ``value`` if that is possible. It may use a regular expression, but in general it should just return ``value`` and let the lookup method sort out the rest. :param str value: the string to inspect :returns: the matched thing or None if unmatched :rtype: the type of lookup's key parameter or NoneType N)ÚNotImplementedError)ÚclsÚvaluerrrÚmatchDszHypothesis.matchcCs tƒ‚dS)aN Lookup the given string according to the hypothesis. :param Context context: the pyudev context :param key: a key with which to lookup the device :type key: the type of match's return value if not None :returns: a list of Devices obtained :rtype: frozenset of :class:`Device` N)r)rÚcontextÚkeyrrrÚlookupUszHypothesis.lookupcCsdS)zé A potentially expensive method that may allow an :class:`Hypothesis` to find devices more rapidly or to find a device that it would otherwise miss. :param Context context: the pyudev context Nr)rrrrrÚsetupcs zHypothesis.setupcCs$|j|ƒ}|dk r|j||ƒStƒS)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)rrÚ frozenset)rrrrrrrÚget_devicesns zHypothesis.get_devicesN)Ú__name__Ú __module__Ú__qualname__Ú__doc__ÚclassmethodÚabcÚabstractmethodrrrrrrrrr>s rc@sLeZdZdZedd„ƒZedd„ƒZedd„ƒZedd „ƒZed d„ƒZ dS) ÚDeviceNumberHypothesisz— Represents the hypothesis that the device is a device number. The device may be separated into major/minor number or a composite number. cCs8tjdƒ}|j|ƒ}|o6tjt|jdƒƒt|jdƒƒƒS)zÌ 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\d+)(\D+)(?P\d+)$ÚmajorÚminor)ÚreÚcompilerÚosÚmakedevÚintÚgroup)rrZmajor_minor_rerrrrÚ_match_major_minorƒs z)DeviceNumberHypothesis._match_major_minorcCs&tjdƒ}|j|ƒ}|o$t|jdƒƒS)zÉ 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\d+)$Znumber)r&r'rr*r+)rrZ number_rerrrrÚ _match_number•s z$DeviceNumberHypothesis._match_numbercCs|j|ƒp|j|ƒS)z Match the number under the assumption that it is a device number. :returns: the device number or None :rtype: int or NoneType )r,r-)rrrrrr¢szDeviceNumberHypothesis.matchcCs|j}tjtjj|dƒƒS)z§ Find subsystems in /sys/dev. :param Context context: the context :returns: a lis of available subsystems :rtype: list of str Zdev)Úsys_pathr(ÚlistdirÚpathÚjoin)rrr.rrrÚfind_subsystems¬s z&DeviceNumberHypothesis.find_subsystemscs8ttjƒ‰‡‡‡fdd„|jˆƒDƒ}tdd„|DƒƒS)zß 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` c3s|]}ˆˆ|ˆƒVqdS)Nr)Ú.0Ús)rr rrrú Ãsz0DeviceNumberHypothesis.lookup..css|]}|dk r|VqdS)Nr)r3Úrrrrr5Äs)rrZfrom_device_numberr2r)rrrÚresr)rr rrr¸s zDeviceNumberHypothesis.lookupN) rrrrr r,r-rr2rrrrrr#|s r#c@s(eZdZdZedd„ƒZedd„ƒZdS)ÚDevicePathHypothesiszG Discover the device assuming the identifier is a device path. cCs|S)z› Match ``value`` under the assumption that it is a device path. :returns: the device path or None :rtype: str or NoneType r)rrrrrrÌszDevicePathHypothesis.matchcCs(ttjƒ||ƒ}|dk r"t|fƒStƒS)zÔ 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)rrZ from_pathr)rrrr7rrrrÖs zDevicePathHypothesis.lookupN)rrrrr rrrrrrr8Çs r8c@s4eZdZdZedd„ƒZedd„ƒZedd„ƒZdS) ÚDeviceNameHypothesiszf Discover the device assuming the input is a device name. Try every available subsystem. cs<|j‰d}‡fdd„|Dƒ}dd„|Dƒ}tdd„|DƒƒS) zœ Find all subsystems in sysfs. :param Context context: the context :rtype: frozenset :returns: subsystems in sysfs ÚbusÚclassÚ subsystemc3s|]}tjjˆ|ƒVqdS)N)r(r0r1)r3Úname)r.rrr5ösz7DeviceNameHypothesis.find_subsystems..css|]}tjj|ƒr|VqdS)N)r(r0Úisdir)r3Údrrrr5÷scss"|]}tj|ƒD] }|VqqdS)N)r(r/)r3r?Únrrrr5øs)r:r;r<)r.r)rrZdirnamesZabsnamesZ realnamesr)r.rr2ës z$DeviceNameHypothesis.find_subsystemscCs|S)z› Match ``value`` under the assumption that it is a device name. :returns: the device path or None :rtype: str or NoneType r)rrrrrrúszDeviceNameHypothesis.matchcs8ttjƒ‰‡‡‡fdd„|jˆƒDƒ}tdd„|DƒƒS)zÔ 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` c3s|]}ˆˆ|ˆƒVqdS)Nr)r3r4)rr rrrr5sz.DeviceNameHypothesis.lookup..css|]}|dk r|VqdS)Nr)r3r6rrrr5s)rrÚ from_namer2r)rrrr7r)rr rrrs zDeviceNameHypothesis.lookupN)rrrrr r2rrrrrrr9äs r9c@sZeZdZdZdddddddd d ddgZed d„ƒZedd„ƒZedd„ƒZedd„ƒZ dS)ÚDeviceFileHypothesisz‡ 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/vgcCs:|jƒ}dd„|Dƒ}dd„|Dƒ}ttdd„|DƒƒƒS)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 css|]}t|jƒr|VqdS)N)ÚlistÚdevice_links)r3r?rrrr55sz5DeviceFileHypothesis.get_link_dirs..css|]}|jD] }|VqqdS)N)rD)r3r?Úlrrrr56scss|]}tjj|ƒVqdS)N)r(r0Údirname)r3rErrrr57s)Zlist_devicesÚsortedÚset)rrÚdevicesZdevices_with_linksZlinksrrrÚ get_link_dirs(sz"DeviceFileHypothesis.get_link_dirscCs|j|ƒ|_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)rJÚ _LINK_DIRS)rrrrrr9s zDeviceFileHypothesis.setupcCs|S)Nr)rrrrrrDszDeviceFileHypothesis.matchcsrttjƒ‰dˆkr4ˆˆˆƒ}|dk r.t|fƒStƒS‡fdd„|jDƒ}‡‡fdd„|Dƒ}tdd„|DƒƒSdS)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. ú/Nc3s|]}tjj|ˆƒVqdS)N)r(r0r1)r3Zld)rrrr5[sz.DeviceFileHypothesis.lookup..c3s|]}ˆˆ|ƒVqdS)Nr)r3Úf)rr rrr5\scss|]}|dk r|VqdS)Nr)r3r?rrrr5]s)rrZfrom_device_filerrK)rrrZdeviceÚfilesrIr)rr rrrHs zDeviceFileHypothesis.lookupN) rrrrrKr rJrrrrrrrrBs rBc@s4eZdZdZeeeegZdd„Z dd„Z dd„ZdS) Ú Discoveryz1 Provides discovery methods for devices. cCs|j|_dS)N)Ú_HYPOTHESESÚ_hypotheses)ÚselfrrrÚ__init__mszDiscovery.__init__cCsx|jD]}|j|ƒqWdS)z Set up individual hypotheses. May be an expensive call. :param Context context: the context N)rQr)rRrZhyprrrrpszDiscovery.setupcst‡‡fdd„|jDƒƒS)zý 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` c3s$|]}|jˆˆƒD] }|VqqdS)N)r)r3Úhr?)rrrrr5…sz(Discovery.get_devices..)rrQ)rRrrr)rrrr{s zDiscovery.get_devicesN)rrrrrBr9r#r8rPrSrrrrrrrO`srO)rZ __future__rrrrr!rr(r&ZsixZ pyudev.devicerrrZ add_metaclassÚABCMetaÚobjectrr#r8r9rBrOrrrrÚs&=K/M