5 A shared library "libudev" will be installed now, to access udev
6 device information. DeviceKit, the successor of HAL, will need this
7 library to access the udev database and search sysfs for devices.
8 The library is currently in an experimental state, also the API is
9 expected to change, as long as the DeviceKit integration isn't
14 We use ./configure now. See INSTALL for details. Current
17 "/usr" - prefix for man pages, include files
19 "" - the root filesystem, prefix for libs and binaries
23 "lib" - directory name for libraries, not a path name
24 multilib 64bit systems may use "lib64" instead of "lib"
26 compile-in verbose debug messages
28 disable all logging and compile-out all log strings
30 link against SELInux libraries, to set the expected context
33 In the default rules, the group "disk" gets permissions 0660 instead
34 of 0640. One small step closer to unify distro rules. Some day, all
35 distros hopefully end up with the same set of rules.
37 No symlinks to udevadm are installed anymore, if they are still needed,
38 they should be provided by the package.
44 Default udev rules, which are not supposed to be edited by the user, should
45 be placed in /lib/udev/rules.d/ now, to make it clear that they are private to
46 the udev package and will be replaced with an update. Udev will pick up rule
48 /lib/udev/rules.d/ - default installed rules
49 /etc/udev/rules.d/ - user rules + on-the-fly generated rules
50 /dev/.udev/rules.d/ - temporary non-persistent rules created after bootup
51 It does not matter in which directory a rule file lives, all files are sorted
54 To help creating /dev/root, we have now:
55 $ udevadm info --export --export-prefix="ROOT_" --device-id-of-file=/
58 In case the current --device-id-of-file is already used, please switch to
59 the --export format version, it saves the output parsing and the old
60 format will be changed to use ':' as a separator, like the format in the
65 Fix cdrom_id to properly recognize blank media.
71 Tape drive id-data is queried from /dev/bsg/* instead of the tape
72 nodes. This avoids rewinding tapes on open().
78 The symlinks udevcontrol and udevtrigger are no longer installed by
81 The scsi_id program does not depend on sysfs anymore. It can speak
82 SGv4 now, so /dev/bsg/* device nodes can be used, to query SCSI device
83 data, which should solve some old problems with tape devices, where
84 we better do not open all tape device nodes to identify the device.
90 The cdrom_id program is replaced by an advanced version, which can
91 detect most common device types, and also properties of the inserted
92 media. This is part of moving some basic functionality from HAL into
93 udev (and the kernel).
99 The last WAIT_FOR_SYSFS rule is removed from the default rules.
101 The symlinks to udevadm for the debugging tools: udevmonitor and
102 udevtest are no longer created.
104 The symlinks to the udevadm man page for the old tool names are
107 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
108 should be prefixed with '@' to indicate that the path is not a
119 Udevstart is removed from the tree, it did not get installed for
120 a long time now, and is long replaced by trigger and settle.
126 All udev tools are merged into a single binary called udevadm.
127 The old names of the tools are built-in commands in udevadm now.
128 Symlinks to udevadm, with the names of the old tools, provide
129 the same functionality as the standalone tools. There is also
130 only a single udevadm.8 man page left for all tools.
132 Tools like mkinitramfs should be checked, if they need to include
133 udevadm in the list of files.
143 The etc/udev/rules.d/ directory now contains a default set of basic
144 udev rules. This initial version is the result of a rules file merge
145 of Fedora and openSUSE. For these both distros only a few specific
146 rules are left in their own file, named after the distro. Rules which
147 are optionally installed, because they are only valid for a specific
148 architecture, or rules for subsystems which are not always used are
149 in etc/udev/packages/.
155 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
156 actions by dynamically created rules.
158 SYMLINK=="<value>" matches agains the entries in the list of
159 currently defined symlinks. The links are not created in the
160 filesystem at that point in time, but the values can be matched.
162 RUN{ignore_error}+="<program>" will ignore any exit code from the
163 program and not record as a failed event.
169 Final merge of patches/features from the Ubuntu package.
175 Control characters in filesystem label strings are no longer silenty
176 removed, but hex-encoded, to be able to uniquely identify the device
177 by its symlink in /dev/disk/by-label/.
178 If libvolume_id is used by mount(8), LABEL= will work as expected,
179 if slashes or other characters are used in the label string.
181 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
182 can be specified now. The TEST key accepts an optional mode mask
183 TEST{0100}=="<is executable file>".
185 Scsi_id now supports a mode without expecting scsi-specific sysfs
186 entries to allow the extraction of cciss-device persistent properties.
192 In the future, we may see uuid's which are just simple character
193 strings (see the DDF Raid Specification). For that reason vol_id now
194 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
195 the creation of symlinks, the *_SAFE values ensure, that no control
196 or whitespace characters are used in the filename.
198 Possible users of libvolume_id, please use the volume_id_get_* functions.
199 The public struct will go away in a future release of the library.
205 Removal of useless extras/eventrecorder.sh.
215 The directory multiplexer for dev.d/ and hotplug.d are finally removed
216 from the udev package.
222 Symlinks can have priorities now, the priority is assigned to the device
223 and specified with OPTIONS="link_priority=100". Devices with higher
224 priorities overwrite the symlinks of devices with lower priorities.
225 If the device that currently owns the link, goes away, the symlink
226 will be removed, and recreated, pointing to the next device with the
227 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
228 more reliable, if multiple devices contain the same metadata and overwrite
231 The dasd_id program is removed from the udev tree, and dasdinfo, with the
232 needed rules, are part of the s390-tools now.
234 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
235 we may get the scsi sysfs mess fixed some day, and this will only catch
236 the devices we are looking for.
238 USB serial numbers for storage devices have the target:lun now appended,
239 to make it possibble to distinguish broken multi-lun devices with all
240 the same SCSI identifiers.
242 Note: The extra "run_directory" which searches and executes stuff in
243 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
244 with the next release. Make sure, that you don't use it anymore, or
245 provides your own implementation of that inefficient stuff.
246 We are tired of reports about a "slow udev", because these directories
247 contain stuff, that runs with _every_ event, instead of using rules,
248 that run programs only for the matching events.
258 DRIVER== will match only for devices that actually have a real
259 driver. DRIVERS== must be used, if parent devices should be
260 included in the match.
262 Libvolume_id's "linux_raid" detection needed another fix.
270 Add additional check to volume_id detection of via_raid, cause
271 some company decided to put a matching pattern all over the empty
272 storage area of their music players.
276 Fix path_id for SAS devices.
280 The udev daemon can be started with --debug-trace now, which will
281 execute all events serialized to get a chance to catch a possible
282 action that crashes the box.
284 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
285 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
286 are excluded from the warning. Referencing parent attributes directly
287 may break when something in the kernel driver model changes. Udev will
288 just find the attribute by walking up the parent chain.
290 Udevtrigger now sorts the list of devices depending on the device
291 dependency, so a "usb" device is triggered after the parent "pci"
296 Revert persistent-storage ata-serial '_' '-' replacement.
302 Udevtrigger can now filter the list of devices to be triggered. Matches
303 for subsystems or sysfs attributes can be specified.
305 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
306 zero-sized files to avoid pointing to /sys and confuse broken tools which
307 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
310 The rules and scripts to create udev rules for persistent network
311 devices and optical drives are in the extras/rules_generator directory
312 now. If you use something similar, please consider replacing your own
313 version with this, to share the support effort. The rule_generator
314 installs its own rules into /etc/udev/rules.d.
316 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
317 the rule_generator depends on cdrom_id to be called in an earlier rule.
323 Renaming of some key names (the old names still work):
324 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
325 (The behavior of the key DRIVER will change soon in one of the next
326 releases, to match only the event device, please switch to DRIVERS
327 instead. If DRIVER is used, it will behave like DRIVERS, but an error
329 With the new key names, we have a more consistent and simpler scheme.
330 We can match the properties of the event device only, with: KERNEL,
331 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
332 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
333 longer mentioned in the man page and should be switched in the rule
336 ATTR{file}="value" can be used now, to write to a sysfs file of the
337 event device. Instead of:
338 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
340 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
342 All the PHYSDEV* keys are deprecated and will be removed from a
344 PHYDEVPATH - is the path of a parent device and should not be
346 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
347 matched with SUBSYSTEMS==
348 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
349 Newer kernels will have DRIVER in the environment,
350 for older kernels udev puts in. Class device will
351 no longer carry this property of a parent and
352 DRIVERS== can be used to match such a parent value.
353 Note that ENV{DRIVER} is only available for a few bus devices, where
354 the driver is already bound at device event time. On coldplug, the
355 events for a lot devices are already bound to a driver, and they will have
356 that value set. But on hotplug, at the time the kernel creates the device,
357 it can't know what driver may claim the device after that, therefore
358 in most cases it will be empty.
360 Failed events should now be re-triggered with:
361 udevtrigger --retry-failed.
362 Please switch to this command, so we keep the details of the /dev/.udev/failed/
363 files private to the udev tools. We may need to switch the current symlink
364 target, cause some obviously broken tools try to scan all files in /dev
365 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
366 million times. This takes ages on slow boxes.
368 The udevinfo attribute walk (-a) now works with giving a device node
369 name (-n) instead of a devpath (-p). The query now always works, also when
370 no database file was created by udev.
372 The built-in /etc/passwd /etc/group parser is removed, we always depend on
373 getpwnam() and getgrnam() now. One of the next releases will depend on
374 fnmatch() and may use getopt_long().
378 Bugfixes and small improvements.
382 Fix path_id for recent kernels.
388 Added support for swapping network interface names, by temporarily
389 renaming the device and wait for the target name to become free.
393 The built-in MODALIAS key and substitution is removed.
397 The binary firmware helper is replaced by the usual simple
398 shell script. Udevsend is removed from the tree.
406 Some more keys require the correct use of '==' and '=' depending
407 on the kind of operation beeing an assignment or a match. Rules
408 with invalid operations are skipped and logged to syslog. Please
409 test with udevtest if the parsing of your rules throws errors and
410 fix possibly broken rules.
414 Provide "udevsettle" to wait for all current udev events to finish.
415 It also watches the current kernel netlink queue by comparing the
416 even sequence number to make sure that there are no current pending
417 events that have not already arrived in the daemon.
421 Fix rule to skip persistent rules for removable IDE devices, which
422 also skipped optical IDE drives.
424 All *_id program are installed in /lib/udev/ by default now.
426 No binary is stripped anymore as this should be done in the
427 packaging process and not at build time.
429 libvolume_id is provided as a shared library now and vol_id is
430 linked against it. Also one of the next HAL versions will require
431 this library, and the HAL build process will also require the
432 header file to be installed. The copy of the same code in HAL will
433 be removed to have only a single copy left on the system.
437 Add persistent links for SCSI tapes. The rules file is renamed
438 to 60-persistent-storage.rules.
440 Create persistent path for usb devices. Can be used for all sorts
441 of devices that can't be distinguished by other properties like
442 multiple identical keyboards and mice connected to the same box.
444 Provide "udevtrigger" program to request events on coldplug. The
445 shell script is much too slow with thousends of devices.
449 Fix persistent disk rules to exclude removable IDE drives.
451 Warn if %e, $modalias or MODALIAS is used.
455 Fix queue export, which wasn't correct for subsequent add/remove
456 events for the same device.
460 Fix cramfs detection on big endian.
462 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
467 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
468 attributes were only checked at the parent device that matched the
469 by BUS requested subsystem. Fix it to also look at the device we
470 received the event for.
472 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
477 Fix a bug where NAME="" would prevent RUN from beeing executed.
479 RUN="/bin/program" does not longer automatically add the subsystem
480 as the first parameter. This is from the days of /sbin/hotplug
481 which is dead now and it's just confusing to need to add a space at
482 the end of the program name to prevent this.
483 If you use rules that need the subsystem as the first parameter,
484 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
485 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
489 The udev man page has moved to udev(7) as it does not describe a command
490 anymore. The programs udev, udevstart and udevsend are no longer installed
491 by default and must be copied manually, if they should be installed or
492 included in a package.
494 Fix a bug where "ignore_device" could run earlier collected RUN keys before
495 the ignore rule was applied.
497 More preparation for future sysfs changes. usb_id and scsi_id no longer
498 depend on a magic order of devices in the /devices chain. Specific devices
499 should be requested by their subsytem.
501 This will always find the scsi parent device without depending on a specific
503 dev = sysfs_device_get(devpath);
504 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
506 The "device" link in the current sysfs layout will be automatically
507 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
508 parent in the devpath. If a device is requested by it's symlink, like all
509 class devices in the new sysfs layout will look like, it gets automatically
510 resolved and substituted with the real devpath and not the symlink path.
513 A similar logic must be applied to _all_ sysfs users, including
514 scripts, that search along parent devices in sysfs. The explicit use of
515 the "device" link must be avoided. With the future sysfs layout all
516 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
517 back to the "class" or the "bus". The layout of the parent devices in
518 /devices is not necessarily expected to be stable across kernel releases and
519 searching for parents by their subsystem should make sysfs users tolerant
520 for changed parent chains.
524 Prepare udev to work with the experimental kernel patch, that moves
525 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
527 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
528 moving the class devices to /sys/devices.
530 Thanks again to Marco for help finding a hopefully nice compromise
531 to make %b simpler and working again.
535 Complete removal of libsysfs, replaced by simple helper functions
536 which are much simpler and a bit faster. The udev daemon operatesentirely
537 on event parameters and does not use sysfs for simple rules anymore.
538 Please report any new bugs/problems, that may be caused by this big
539 change. They will be fixed immediately.
541 The enumeration format character '%e' is deprecated and will be
542 removed sometimes from a future udev version. It never worked correctly
543 outside of udevstart, so we can't use it with the new parallel
544 coldplug. A simple enumeration is as useless as the devfs naming
545 scheme, just get rid of both if you still use it.
547 MODALIAS and $modalias is not needed and will be removed from one of
548 the next udev versions, replace it in all rules with ENV{MODALIAS} or
549 the sysfs "modalias" value.
551 Thanks a lot to Marco for all his help on finding and fixing bugs.
555 Let scsi_id request libata drive serial numbers from page 0x80.
557 Renamed etc/udev/persistent.rules to persistent-disk.rules and
558 added /dev/disk/by-name/* for device mapper device names.
560 Removed %e from the man page. It never worked reliably outside
561 of udevstart and udevstart is no longer recommended to use.
565 Symlinks are now exported to the event environment. Hopefully it's no
566 longer needed to run udevinfo from an event process, like it was
567 mentioned on the hotplug list:
568 UDEV [1134776873.702967] add@/block/sdb
571 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
575 Fix a problem if udevsend is used as the hotplug handler and tries to use
576 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
577 and this kind of problems will hopefully go away soon.
581 All built-in logic to work around bad sysfs timing is removed with this
582 version. The need to wait for sysfs files is almost fixed with a kernel
583 version that doesn't work with this udev version anyway. Until we fix
584 the timing of the "bus" link creation, the former integrated logic should
585 be emulated by a rule placed before all other rules:
586 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
588 The option "udev_db" does no longer exist. All udev state will be in
589 /$udev_root/.udev/ now, there is no longer an option to set this
591 If the init script or something else used this value, just depend on
592 this hardcoded path. But remember _all_content_ of this directory is
593 still private to udev and can change at any time.
595 Default location for rule sripts and helper programs is now: /lib/udev/.
596 Everything that is not useful on the commandline should go into this
597 directory. Some of the helpers in the extras folder are installed there
598 now. The rules need to be changed, to find the helpers there.
600 Also /lib/udev/devices is recommended as a directory where packages or
601 the user can place real device nodes, which get copied over to /dev at
602 every boot. This should replace the various solutions with custom config
605 Udevsend does no longer start the udev daemon. This must be done with
606 the init script that prepares /dev on tmpfs and creates the initial nodes,
607 before starting the daemon.
611 Silent a too verbose error logging for the old hotplug.d/ dev.d/
614 The copy of klibc is removed. A systemwide installed version of klibc
615 should be used to build a klibc udev now.
619 NAME="" will not create any nodes, but execute RUN keys. To completely
620 ignore an event the OPTION "ignore_device" should be used.
622 After removal of the reorder queue, events with a TIMEOUT can be executed
623 without any queuing now.
627 Fixed bug in udevd, if inotify is not available. We depend on netlink
628 uevents now, kernels without that event source will not work with that
629 version of udev anymore.
633 The rule parsing happens now in the daemon once at startup, all udev
634 event processes inherit the already parsed rules from the daemon.
635 It is shipped with SUSE10.0 and reduces heavily the system load at
636 startup. The option to save precompiled rules and let the udev process
637 pick the them up is removed, as it's no longer needed.
639 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
640 device. Libsysfs is changed to "translate" the requested link into the
641 real device path, as it would happen with the hotplug event. Otherwise
642 device removal and the udev database will not work.
644 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
647 A few improvements for vol_id, the filesytem probing code.
651 Fix a stupid typo in extras/run_directory for "make install".
653 scsi_id creates the temporary devnode now in /dev for usage with a
654 non-writable /tmp directory.
656 The uevent kernel socket buffer can carry app. 50.000 events now,
657 let's see who can break this again. :)
659 The upcoming kernel will have a new input driver core integration.
660 Some class devices are now symlinks to the real device. libsysfs
661 needs a fix for this to work correctly. Udevstart of older udev
662 versions will _not_ create these devices!
666 Fix a 'install' target in the Makefile, that prevents EXTRAS from
671 A bunch of mostly trivial bugfixes. From now on no node name or
672 symlink name can contain any character than plain whitelisted ascii
673 characters or validated utf8 byte-streams. This is needed for the
674 /dev/disk/by-label/* links, because we import untrusted data and
675 export it to the filesystem.
679 More bugfixes. If udevd was started from the kernel, we don't
680 have stdin/stdout/stderr, which broke the forked tools in some
685 Bugfix. udevstart event ordering was broken for a long time.
686 The new run_program() uncovered it, because /dev/null was not
687 available while we try to run external programs.
688 Now udevstart should create it before we run anything.
692 Minor bugfixes and some distro rules updates. If you don't have the
693 persistent disk rules in /dev/disk/by-*/* on your distro, just
694 grab it from here. :)
698 We can use socket communication now to pass events from udev to
700 RUN+="socket:/org/freedesktop/hal/udev_event"
701 will pass the whole udev event to the HAL daemon without the need
702 for a forked helper. (See ChangeLog for udevmonitor, as an example)
706 Mostly bugfixes and see ChangeLog.
708 The test for the existence of an environment value should be
710 ENV{KEY}=="*" to ENV{KEY}=="?*"
711 because "*" will not fail anymore, if the key does not exist or
716 Bugfixes and a few tweaks described in the ChangeLog.
720 Mostly a Bugfix release.
722 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
723 timing with custom rules.
727 We changed the internal rule storage format. Our large rule files took
728 2 MB of RAM, with the change we are down to 99kB.
730 If the device-node has been created with default name and no symlink or
731 options are to remenber, it is not longer stored in the udevdb. HAL will
732 need to be updated to work correctly with that change.
734 To overrride optimization flags, OPTFLAGS may be used now.
742 Major changes happened with this release. The goal is to take over the
743 complete kernel-event handling and provide a more efficient way to dispatch
744 kernel events. Replacing most of the current shell script logic and the
745 kernel forked helper with a netlink-daemon and a rule-based event handling.
747 o udevd listens to netlink events now. The first valid netlink event
748 will make udevd ignore any message from udevsend that contains a
749 SEQNUM, to avoid duplicate events. The forked events can be disabled
751 echo "" > /proc/sys/kernel/hotplug
752 For full support, the broken input-subsytem needs to be fixed, not to
753 bypass the driver core.
755 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
756 removed from udev itself and must be emulated by calling small
757 helper binaries provided in the extras folder:
758 make EXTRAS=extras/run_directory/
759 will build udev_run_devd and udev_run_hotplugd, which can be called
760 from a rule if needed:
761 RUN+="/sbin/udev_run_hotplugd"
762 The recommended way to handle this is to convert all the calls from
763 the directories to explicit udev rules and get completely rid of the
764 multiplexing. (To catch a ttyUSB event, you now no longer need to
765 fork and exit 300 tty script instances you are not interested in, it
766 is just one rule that matches exactly the device.)
768 o udev handles now _all_ events not just events for class and block
769 devices, this way it is possible to control the complete event
770 behavior with udev rules. Especially useful for rules like:
771 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
773 o As used in the modalias rule, udev supports now textual
774 substitution placeholder along with the usual format chars. This
775 needs to be documented, for now it's only visible in udev_rules_parse.c.
777 o The rule keys support now more operations. This is documented in the
778 man page. It is possible to add values to list-keys like the SYMLINK
779 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
780 Also "final"-assignments are supported by using KEY:="value", which will
781 prevent changing the key by any later rule.
783 o kernel 2.6.12 has the "detached_state" attribute removed from
784 sysfs, which was used to recognize sysfs population. We switched that
785 to wait for the "bus" link, which is only available in kernels after 2.6.11.
786 Running this udev version on older kernels may cause a short delay for
789 o To provide infrastructure for persistent device naming, the id programs:
790 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
791 to export the probed data in environment key format:
792 pim:~ # /sbin/ata_id --export /dev/hda
793 ID_MODEL=HTS726060M9AT00
794 ID_SERIAL=MRH401M4G6UM9B
798 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
799 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
802 kay@pim:~> tree /dev/disk
805 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
806 | `-- IBM-Memory_Key -> ../../sda
808 | |-- swap -> ../../hda1
809 | |-- date -> ../../sda1
810 | `-- home -> ../../hda3
812 |-- 2E08712B0870F2E7 -> ../../hda3
813 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
814 |-- E845-7A89 -> ../../sda1
815 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
817 The IMPORT= operation will import these keys in the environment and make
818 it available for later PROGRAM= and RUN= executed programs. The keys are
819 also stored in the udevdb and can be queried from there with one of the
822 o A few binaries are silently added to the repository, which can be used
823 to replay kernel events from initramfs instead of using coldplug. udevd
824 can be instructed now to queue-up events while the stored events from
825 initramfs are filled into the udevd-queue. This code is still under
826 development and there is no documentation now besides the code itself.
827 The additional binaries get compiled, but are not installed by default.
829 o There is also a temporary fix for a performance problem where too many
830 events happen in parallel and every event needs to parse the rules.
831 udev can now read precompiled rules stored on disk. This is likely to be
832 replaced by a more elegant solution in a future udev version.
836 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
837 Fix for libsysfs not to expect this file was added.
841 All rules are applied now, but only the first matching rule with a NAME-key
842 will be applied. All later rules with NAME-key are completely ignored. This
843 way system supplied symlinks or permissions gets applied to user-defined
847 Please check your rules setup, if you may need to add OPTIONS="last_rule"
848 to some rules, to keep the old behavior.
850 The rules are read on "remove"-events too. That makes is possible to match
851 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
852 instruct udev to ignore an event (OPTIONS="ignore_device").
853 The new ACTION-key may be used to let a rule act only at a "remove"-event.
855 The new RUN-key supports rule-based execution of programs after device-node
856 handling. This is meant as a general replacement for the dev.d/-directories
857 to give fine grained control over the execution of programs.
859 The %s{}-sysfs format char replacement values are searched at any of the
860 devices in the device chain now, not only at the class-device.
862 We support log priority levels now. The value udev_log in udev.conf is used
863 to determine what is printed to syslog. This makes it possible to
864 run a version with compiled-in debug messages in a production environment
865 which is sometimes needed to find a bug.
866 It is still possible to supress the inclusion of _any_ syslog usage with
867 USE_LOG=false to create the smallest possible binaries if needed.
868 The configured udev_log value can be overridden with the environment variable
873 Possible use of a system-wide klibc:
874 make USE_KLIBC=true KLCC=/usr/bin/klcc all
875 will link against an external klibc and our own version will be ignored.
879 We support an unlimited count of symlinks now.
881 If USE_STATIC=true is passed to a glibc build, we link statically and use
882 a built-in userdb parser to resolve user and group names.
884 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
885 we walk up the chain of physical devices to find a match.
887 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
888 easy to skip certain attribute matches without composing rules with weird
889 character class negations like:
890 KERNEL="[!s][!c][!d]*"
891 this can now be replaced with:
893 The current simple '=' is still supported, and should work as it does today,
894 but existing rules should be converted if possible, to be better readable.
896 We have new ENV{}== key now, to match against a maximum of 5 environment
899 udevstart is its own binary again, because we don't need co carry this araound
900 with every forked event.
~ianmdlvl / elogind.git / blob