7 We use ./configure now. See INSTALL for details. Current
10 "/usr" - prefix for man pages, include files
12 "" - the root filesystem, prefix for libs and binaries
16 "lib" - directory name for libraries, not a path name
17 multilib 64bit systems may use "lib64" instead of "lib"
19 compile-in verbose debug messages
21 disable all logging and compile-out all log strings
23 link against SELInux libraries, to set the expected context
26 In the default rules, the group "disk" gets permissions 0660 instead
27 of 0640. One small step closer to unify distro rules. Some day, all
28 distros hopefully end up with the same set of rules.
30 No symlinks to udevadm are installed anymore, if they are still needed,
31 they should be provided by the package.
37 Default udev rules, which are not supposed to be edited by the user, should
38 be placed in /lib/udev/rules.d/ now, to make it clear that they are private to
39 the udev package and will be replaced with an update. Udev will pick up rule
41 /lib/udev/rules.d/ - default installed rules
42 /etc/udev/rules.d/ - user rules + on-the-fly generated rules
43 /dev/.udev/rules.d/ - temporary non-persistent rules created after bootup
44 It does not matter in which directory a rule file lives, all files are sorted
47 To help creating /dev/root, we have now:
48 $ udevadm info --export --export-prefix="ROOT_" --device-id-of-file=/
51 In case the current --device-id-of-file is already used, please switch to
52 the --export format version, it saves the output parsing and the old
53 format will be changed to use ':' as a separator, like the format in the
58 Fix cdrom_id to properly recognize blank media.
64 Tape drive id-data is queried from /dev/bsg/* instead of the tape
65 nodes. This avoids rewinding tapes on open().
71 The symlinks udevcontrol and udevtrigger are no longer installed by
74 The scsi_id program does not depend on sysfs anymore. It can speak
75 SGv4 now, so /dev/bsg/* device nodes can be used, to query SCSI device
76 data, which should solve some old problems with tape devices, where
77 we better do not open all tape device nodes to identify the device.
83 The cdrom_id program is replaced by an advanced version, which can
84 detect most common device types, and also properties of the inserted
85 media. This is part of moving some basic functionality from HAL into
86 udev (and the kernel).
92 The last WAIT_FOR_SYSFS rule is removed from the default rules.
94 The symlinks to udevadm for the debugging tools: udevmonitor and
95 udevtest are no longer created.
97 The symlinks to the udevadm man page for the old tool names are
100 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
101 should be prefixed with '@' to indicate that the path is not a
112 Udevstart is removed from the tree, it did not get installed for
113 a long time now, and is long replaced by trigger and settle.
119 All udev tools are merged into a single binary called udevadm.
120 The old names of the tools are built-in commands in udevadm now.
121 Symlinks to udevadm, with the names of the old tools, provide
122 the same functionality as the standalone tools. There is also
123 only a single udevadm.8 man page left for all tools.
125 Tools like mkinitramfs should be checked, if they need to include
126 udevadm in the list of files.
136 The etc/udev/rules.d/ directory now contains a default set of basic
137 udev rules. This initial version is the result of a rules file merge
138 of Fedora and openSUSE. For these both distros only a few specific
139 rules are left in their own file, named after the distro. Rules which
140 are optionally installed, because they are only valid for a specific
141 architecture, or rules for subsystems which are not always used are
142 in etc/udev/packages/.
148 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
149 actions by dynamically created rules.
151 SYMLINK=="<value>" matches agains the entries in the list of
152 currently defined symlinks. The links are not created in the
153 filesystem at that point in time, but the values can be matched.
155 RUN{ignore_error}+="<program>" will ignore any exit code from the
156 program and not record as a failed event.
162 Final merge of patches/features from the Ubuntu package.
168 Control characters in filesystem label strings are no longer silenty
169 removed, but hex-encoded, to be able to uniquely identify the device
170 by its symlink in /dev/disk/by-label/.
171 If libvolume_id is used by mount(8), LABEL= will work as expected,
172 if slashes or other characters are used in the label string.
174 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
175 can be specified now. The TEST key accepts an optional mode mask
176 TEST{0100}=="<is executable file>".
178 Scsi_id now supports a mode without expecting scsi-specific sysfs
179 entries to allow the extraction of cciss-device persistent properties.
185 In the future, we may see uuid's which are just simple character
186 strings (see the DDF Raid Specification). For that reason vol_id now
187 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
188 the creation of symlinks, the *_SAFE values ensure, that no control
189 or whitespace characters are used in the filename.
191 Possible users of libvolume_id, please use the volume_id_get_* functions.
192 The public struct will go away in a future release of the library.
198 Removal of useless extras/eventrecorder.sh.
208 The directory multiplexer for dev.d/ and hotplug.d are finally removed
209 from the udev package.
215 Symlinks can have priorities now, the priority is assigned to the device
216 and specified with OPTIONS="link_priority=100". Devices with higher
217 priorities overwrite the symlinks of devices with lower priorities.
218 If the device that currently owns the link, goes away, the symlink
219 will be removed, and recreated, pointing to the next device with the
220 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
221 more reliable, if multiple devices contain the same metadata and overwrite
224 The dasd_id program is removed from the udev tree, and dasdinfo, with the
225 needed rules, are part of the s390-tools now.
227 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
228 we may get the scsi sysfs mess fixed some day, and this will only catch
229 the devices we are looking for.
231 USB serial numbers for storage devices have the target:lun now appended,
232 to make it possibble to distinguish broken multi-lun devices with all
233 the same SCSI identifiers.
235 Note: The extra "run_directory" which searches and executes stuff in
236 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
237 with the next release. Make sure, that you don't use it anymore, or
238 provides your own implementation of that inefficient stuff.
239 We are tired of reports about a "slow udev", because these directories
240 contain stuff, that runs with _every_ event, instead of using rules,
241 that run programs only for the matching events.
251 DRIVER== will match only for devices that actually have a real
252 driver. DRIVERS== must be used, if parent devices should be
253 included in the match.
255 Libvolume_id's "linux_raid" detection needed another fix.
263 Add additional check to volume_id detection of via_raid, cause
264 some company decided to put a matching pattern all over the empty
265 storage area of their music players.
269 Fix path_id for SAS devices.
273 The udev daemon can be started with --debug-trace now, which will
274 execute all events serialized to get a chance to catch a possible
275 action that crashes the box.
277 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
278 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
279 are excluded from the warning. Referencing parent attributes directly
280 may break when something in the kernel driver model changes. Udev will
281 just find the attribute by walking up the parent chain.
283 Udevtrigger now sorts the list of devices depending on the device
284 dependency, so a "usb" device is triggered after the parent "pci"
289 Revert persistent-storage ata-serial '_' '-' replacement.
295 Udevtrigger can now filter the list of devices to be triggered. Matches
296 for subsystems or sysfs attributes can be specified.
298 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
299 zero-sized files to avoid pointing to /sys and confuse broken tools which
300 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
303 The rules and scripts to create udev rules for persistent network
304 devices and optical drives are in the extras/rules_generator directory
305 now. If you use something similar, please consider replacing your own
306 version with this, to share the support effort. The rule_generator
307 installs its own rules into /etc/udev/rules.d.
309 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
310 the rule_generator depends on cdrom_id to be called in an earlier rule.
316 Renaming of some key names (the old names still work):
317 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
318 (The behavior of the key DRIVER will change soon in one of the next
319 releases, to match only the event device, please switch to DRIVERS
320 instead. If DRIVER is used, it will behave like DRIVERS, but an error
322 With the new key names, we have a more consistent and simpler scheme.
323 We can match the properties of the event device only, with: KERNEL,
324 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
325 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
326 longer mentioned in the man page and should be switched in the rule
329 ATTR{file}="value" can be used now, to write to a sysfs file of the
330 event device. Instead of:
331 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
333 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
335 All the PHYSDEV* keys are deprecated and will be removed from a
337 PHYDEVPATH - is the path of a parent device and should not be
339 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
340 matched with SUBSYSTEMS==
341 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
342 Newer kernels will have DRIVER in the environment,
343 for older kernels udev puts in. Class device will
344 no longer carry this property of a parent and
345 DRIVERS== can be used to match such a parent value.
346 Note that ENV{DRIVER} is only available for a few bus devices, where
347 the driver is already bound at device event time. On coldplug, the
348 events for a lot devices are already bound to a driver, and they will have
349 that value set. But on hotplug, at the time the kernel creates the device,
350 it can't know what driver may claim the device after that, therefore
351 in most cases it will be empty.
353 Failed events should now be re-triggered with:
354 udevtrigger --retry-failed.
355 Please switch to this command, so we keep the details of the /dev/.udev/failed/
356 files private to the udev tools. We may need to switch the current symlink
357 target, cause some obviously broken tools try to scan all files in /dev
358 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
359 million times. This takes ages on slow boxes.
361 The udevinfo attribute walk (-a) now works with giving a device node
362 name (-n) instead of a devpath (-p). The query now always works, also when
363 no database file was created by udev.
365 The built-in /etc/passwd /etc/group parser is removed, we always depend on
366 getpwnam() and getgrnam() now. One of the next releases will depend on
367 fnmatch() and may use getopt_long().
371 Bugfixes and small improvements.
375 Fix path_id for recent kernels.
381 Added support for swapping network interface names, by temporarily
382 renaming the device and wait for the target name to become free.
386 The built-in MODALIAS key and substitution is removed.
390 The binary firmware helper is replaced by the usual simple
391 shell script. Udevsend is removed from the tree.
399 Some more keys require the correct use of '==' and '=' depending
400 on the kind of operation beeing an assignment or a match. Rules
401 with invalid operations are skipped and logged to syslog. Please
402 test with udevtest if the parsing of your rules throws errors and
403 fix possibly broken rules.
407 Provide "udevsettle" to wait for all current udev events to finish.
408 It also watches the current kernel netlink queue by comparing the
409 even sequence number to make sure that there are no current pending
410 events that have not already arrived in the daemon.
414 Fix rule to skip persistent rules for removable IDE devices, which
415 also skipped optical IDE drives.
417 All *_id program are installed in /lib/udev/ by default now.
419 No binary is stripped anymore as this should be done in the
420 packaging process and not at build time.
422 libvolume_id is provided as a shared library now and vol_id is
423 linked against it. Also one of the next HAL versions will require
424 this library, and the HAL build process will also require the
425 header file to be installed. The copy of the same code in HAL will
426 be removed to have only a single copy left on the system.
430 Add persistent links for SCSI tapes. The rules file is renamed
431 to 60-persistent-storage.rules.
433 Create persistent path for usb devices. Can be used for all sorts
434 of devices that can't be distinguished by other properties like
435 multiple identical keyboards and mice connected to the same box.
437 Provide "udevtrigger" program to request events on coldplug. The
438 shell script is much too slow with thousends of devices.
442 Fix persistent disk rules to exclude removable IDE drives.
444 Warn if %e, $modalias or MODALIAS is used.
448 Fix queue export, which wasn't correct for subsequent add/remove
449 events for the same device.
453 Fix cramfs detection on big endian.
455 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
460 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
461 attributes were only checked at the parent device that matched the
462 by BUS requested subsystem. Fix it to also look at the device we
463 received the event for.
465 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
470 Fix a bug where NAME="" would prevent RUN from beeing executed.
472 RUN="/bin/program" does not longer automatically add the subsystem
473 as the first parameter. This is from the days of /sbin/hotplug
474 which is dead now and it's just confusing to need to add a space at
475 the end of the program name to prevent this.
476 If you use rules that need the subsystem as the first parameter,
477 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
478 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
482 The udev man page has moved to udev(7) as it does not describe a command
483 anymore. The programs udev, udevstart and udevsend are no longer installed
484 by default and must be copied manually, if they should be installed or
485 included in a package.
487 Fix a bug where "ignore_device" could run earlier collected RUN keys before
488 the ignore rule was applied.
490 More preparation for future sysfs changes. usb_id and scsi_id no longer
491 depend on a magic order of devices in the /devices chain. Specific devices
492 should be requested by their subsytem.
494 This will always find the scsi parent device without depending on a specific
496 dev = sysfs_device_get(devpath);
497 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
499 The "device" link in the current sysfs layout will be automatically
500 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
501 parent in the devpath. If a device is requested by it's symlink, like all
502 class devices in the new sysfs layout will look like, it gets automatically
503 resolved and substituted with the real devpath and not the symlink path.
506 A similar logic must be applied to _all_ sysfs users, including
507 scripts, that search along parent devices in sysfs. The explicit use of
508 the "device" link must be avoided. With the future sysfs layout all
509 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
510 back to the "class" or the "bus". The layout of the parent devices in
511 /devices is not necessarily expected to be stable across kernel releases and
512 searching for parents by their subsystem should make sysfs users tolerant
513 for changed parent chains.
517 Prepare udev to work with the experimental kernel patch, that moves
518 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
520 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
521 moving the class devices to /sys/devices.
523 Thanks again to Marco for help finding a hopefully nice compromise
524 to make %b simpler and working again.
528 Complete removal of libsysfs, replaced by simple helper functions
529 which are much simpler and a bit faster. The udev daemon operatesentirely
530 on event parameters and does not use sysfs for simple rules anymore.
531 Please report any new bugs/problems, that may be caused by this big
532 change. They will be fixed immediately.
534 The enumeration format character '%e' is deprecated and will be
535 removed sometimes from a future udev version. It never worked correctly
536 outside of udevstart, so we can't use it with the new parallel
537 coldplug. A simple enumeration is as useless as the devfs naming
538 scheme, just get rid of both if you still use it.
540 MODALIAS and $modalias is not needed and will be removed from one of
541 the next udev versions, replace it in all rules with ENV{MODALIAS} or
542 the sysfs "modalias" value.
544 Thanks a lot to Marco for all his help on finding and fixing bugs.
548 Let scsi_id request libata drive serial numbers from page 0x80.
550 Renamed etc/udev/persistent.rules to persistent-disk.rules and
551 added /dev/disk/by-name/* for device mapper device names.
553 Removed %e from the man page. It never worked reliably outside
554 of udevstart and udevstart is no longer recommended to use.
558 Symlinks are now exported to the event environment. Hopefully it's no
559 longer needed to run udevinfo from an event process, like it was
560 mentioned on the hotplug list:
561 UDEV [1134776873.702967] add@/block/sdb
564 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
568 Fix a problem if udevsend is used as the hotplug handler and tries to use
569 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
570 and this kind of problems will hopefully go away soon.
574 All built-in logic to work around bad sysfs timing is removed with this
575 version. The need to wait for sysfs files is almost fixed with a kernel
576 version that doesn't work with this udev version anyway. Until we fix
577 the timing of the "bus" link creation, the former integrated logic should
578 be emulated by a rule placed before all other rules:
579 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
581 The option "udev_db" does no longer exist. All udev state will be in
582 /$udev_root/.udev/ now, there is no longer an option to set this
584 If the init script or something else used this value, just depend on
585 this hardcoded path. But remember _all_content_ of this directory is
586 still private to udev and can change at any time.
588 Default location for rule sripts and helper programs is now: /lib/udev/.
589 Everything that is not useful on the commandline should go into this
590 directory. Some of the helpers in the extras folder are installed there
591 now. The rules need to be changed, to find the helpers there.
593 Also /lib/udev/devices is recommended as a directory where packages or
594 the user can place real device nodes, which get copied over to /dev at
595 every boot. This should replace the various solutions with custom config
598 Udevsend does no longer start the udev daemon. This must be done with
599 the init script that prepares /dev on tmpfs and creates the initial nodes,
600 before starting the daemon.
604 Silent a too verbose error logging for the old hotplug.d/ dev.d/
607 The copy of klibc is removed. A systemwide installed version of klibc
608 should be used to build a klibc udev now.
612 NAME="" will not create any nodes, but execute RUN keys. To completely
613 ignore an event the OPTION "ignore_device" should be used.
615 After removal of the reorder queue, events with a TIMEOUT can be executed
616 without any queuing now.
620 Fixed bug in udevd, if inotify is not available. We depend on netlink
621 uevents now, kernels without that event source will not work with that
622 version of udev anymore.
626 The rule parsing happens now in the daemon once at startup, all udev
627 event processes inherit the already parsed rules from the daemon.
628 It is shipped with SUSE10.0 and reduces heavily the system load at
629 startup. The option to save precompiled rules and let the udev process
630 pick the them up is removed, as it's no longer needed.
632 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
633 device. Libsysfs is changed to "translate" the requested link into the
634 real device path, as it would happen with the hotplug event. Otherwise
635 device removal and the udev database will not work.
637 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
640 A few improvements for vol_id, the filesytem probing code.
644 Fix a stupid typo in extras/run_directory for "make install".
646 scsi_id creates the temporary devnode now in /dev for usage with a
647 non-writable /tmp directory.
649 The uevent kernel socket buffer can carry app. 50.000 events now,
650 let's see who can break this again. :)
652 The upcoming kernel will have a new input driver core integration.
653 Some class devices are now symlinks to the real device. libsysfs
654 needs a fix for this to work correctly. Udevstart of older udev
655 versions will _not_ create these devices!
659 Fix a 'install' target in the Makefile, that prevents EXTRAS from
664 A bunch of mostly trivial bugfixes. From now on no node name or
665 symlink name can contain any character than plain whitelisted ascii
666 characters or validated utf8 byte-streams. This is needed for the
667 /dev/disk/by-label/* links, because we import untrusted data and
668 export it to the filesystem.
672 More bugfixes. If udevd was started from the kernel, we don't
673 have stdin/stdout/stderr, which broke the forked tools in some
678 Bugfix. udevstart event ordering was broken for a long time.
679 The new run_program() uncovered it, because /dev/null was not
680 available while we try to run external programs.
681 Now udevstart should create it before we run anything.
685 Minor bugfixes and some distro rules updates. If you don't have the
686 persistent disk rules in /dev/disk/by-*/* on your distro, just
687 grab it from here. :)
691 We can use socket communication now to pass events from udev to
693 RUN+="socket:/org/freedesktop/hal/udev_event"
694 will pass the whole udev event to the HAL daemon without the need
695 for a forked helper. (See ChangeLog for udevmonitor, as an example)
699 Mostly bugfixes and see ChangeLog.
701 The test for the existence of an environment value should be
703 ENV{KEY}=="*" to ENV{KEY}=="?*"
704 because "*" will not fail anymore, if the key does not exist or
709 Bugfixes and a few tweaks described in the ChangeLog.
713 Mostly a Bugfix release.
715 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
716 timing with custom rules.
720 We changed the internal rule storage format. Our large rule files took
721 2 MB of RAM, with the change we are down to 99kB.
723 If the device-node has been created with default name and no symlink or
724 options are to remenber, it is not longer stored in the udevdb. HAL will
725 need to be updated to work correctly with that change.
727 To overrride optimization flags, OPTFLAGS may be used now.
735 Major changes happened with this release. The goal is to take over the
736 complete kernel-event handling and provide a more efficient way to dispatch
737 kernel events. Replacing most of the current shell script logic and the
738 kernel forked helper with a netlink-daemon and a rule-based event handling.
740 o udevd listens to netlink events now. The first valid netlink event
741 will make udevd ignore any message from udevsend that contains a
742 SEQNUM, to avoid duplicate events. The forked events can be disabled
744 echo "" > /proc/sys/kernel/hotplug
745 For full support, the broken input-subsytem needs to be fixed, not to
746 bypass the driver core.
748 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
749 removed from udev itself and must be emulated by calling small
750 helper binaries provided in the extras folder:
751 make EXTRAS=extras/run_directory/
752 will build udev_run_devd and udev_run_hotplugd, which can be called
753 from a rule if needed:
754 RUN+="/sbin/udev_run_hotplugd"
755 The recommended way to handle this is to convert all the calls from
756 the directories to explicit udev rules and get completely rid of the
757 multiplexing. (To catch a ttyUSB event, you now no longer need to
758 fork and exit 300 tty script instances you are not interested in, it
759 is just one rule that matches exactly the device.)
761 o udev handles now _all_ events not just events for class and block
762 devices, this way it is possible to control the complete event
763 behavior with udev rules. Especially useful for rules like:
764 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
766 o As used in the modalias rule, udev supports now textual
767 substitution placeholder along with the usual format chars. This
768 needs to be documented, for now it's only visible in udev_rules_parse.c.
770 o The rule keys support now more operations. This is documented in the
771 man page. It is possible to add values to list-keys like the SYMLINK
772 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
773 Also "final"-assignments are supported by using KEY:="value", which will
774 prevent changing the key by any later rule.
776 o kernel 2.6.12 has the "detached_state" attribute removed from
777 sysfs, which was used to recognize sysfs population. We switched that
778 to wait for the "bus" link, which is only available in kernels after 2.6.11.
779 Running this udev version on older kernels may cause a short delay for
782 o To provide infrastructure for persistent device naming, the id programs:
783 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
784 to export the probed data in environment key format:
785 pim:~ # /sbin/ata_id --export /dev/hda
786 ID_MODEL=HTS726060M9AT00
787 ID_SERIAL=MRH401M4G6UM9B
791 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
792 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
795 kay@pim:~> tree /dev/disk
798 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
799 | `-- IBM-Memory_Key -> ../../sda
801 | |-- swap -> ../../hda1
802 | |-- date -> ../../sda1
803 | `-- home -> ../../hda3
805 |-- 2E08712B0870F2E7 -> ../../hda3
806 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
807 |-- E845-7A89 -> ../../sda1
808 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
810 The IMPORT= operation will import these keys in the environment and make
811 it available for later PROGRAM= and RUN= executed programs. The keys are
812 also stored in the udevdb and can be queried from there with one of the
815 o A few binaries are silently added to the repository, which can be used
816 to replay kernel events from initramfs instead of using coldplug. udevd
817 can be instructed now to queue-up events while the stored events from
818 initramfs are filled into the udevd-queue. This code is still under
819 development and there is no documentation now besides the code itself.
820 The additional binaries get compiled, but are not installed by default.
822 o There is also a temporary fix for a performance problem where too many
823 events happen in parallel and every event needs to parse the rules.
824 udev can now read precompiled rules stored on disk. This is likely to be
825 replaced by a more elegant solution in a future udev version.
829 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
830 Fix for libsysfs not to expect this file was added.
834 All rules are applied now, but only the first matching rule with a NAME-key
835 will be applied. All later rules with NAME-key are completely ignored. This
836 way system supplied symlinks or permissions gets applied to user-defined
840 Please check your rules setup, if you may need to add OPTIONS="last_rule"
841 to some rules, to keep the old behavior.
843 The rules are read on "remove"-events too. That makes is possible to match
844 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
845 instruct udev to ignore an event (OPTIONS="ignore_device").
846 The new ACTION-key may be used to let a rule act only at a "remove"-event.
848 The new RUN-key supports rule-based execution of programs after device-node
849 handling. This is meant as a general replacement for the dev.d/-directories
850 to give fine grained control over the execution of programs.
852 The %s{}-sysfs format char replacement values are searched at any of the
853 devices in the device chain now, not only at the class-device.
855 We support log priority levels now. The value udev_log in udev.conf is used
856 to determine what is printed to syslog. This makes it possible to
857 run a version with compiled-in debug messages in a production environment
858 which is sometimes needed to find a bug.
859 It is still possible to supress the inclusion of _any_ syslog usage with
860 USE_LOG=false to create the smallest possible binaries if needed.
861 The configured udev_log value can be overridden with the environment variable
866 Possible use of a system-wide klibc:
867 make USE_KLIBC=true KLCC=/usr/bin/klcc all
868 will link against an external klibc and our own version will be ignored.
872 We support an unlimited count of symlinks now.
874 If USE_STATIC=true is passed to a glibc build, we link statically and use
875 a built-in userdb parser to resolve user and group names.
877 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
878 we walk up the chain of physical devices to find a match.
880 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
881 easy to skip certain attribute matches without composing rules with weird
882 character class negations like:
883 KERNEL="[!s][!c][!d]*"
884 this can now be replaced with:
886 The current simple '=' is still supported, and should work as it does today,
887 but existing rules should be converted if possible, to be better readable.
889 We have new ENV{}== key now, to match against a maximum of 5 environment
892 udevstart is its own binary again, because we don't need co carry this araound
893 with every forked event.
~ianmdlvl / elogind.git / blob