5 The udevadm info --device-id-of-file= output has changed to use
6 the obvious format. Possible current users should use the --export
7 option which is not affected.
13 Optical drive's media is no longer probed for raid signatures,
14 reading the end of the device causes some devices to malfunction.
15 Also the offset of the last session found is used now to probe
18 The volume_id library got a major version number update to 1,
19 some deprecated functions are removed.
21 A shared library "libudev" gets installed now to provide access
22 to udev device information. DeviceKit, the successor of HAL, will
23 need this library to access the udev database and search sysfs for
25 The library is currently in an experimental state, also the API is
26 expected to change, as long as the DeviceKit integration is not
31 We use ./configure now. See INSTALL for details. Current
34 "/usr" - prefix for man pages, include files
36 "" - the root filesystem, prefix for libs and binaries
40 "lib" - directory name for libraries, not a path name
41 multilib 64bit systems may use "lib64" instead of "lib"
43 compile-in verbose debug messages
45 disable all logging and compile-out all log strings
47 link against SELInux libraries, to set the expected context
50 In the default rules, the group "disk" gets permissions 0660 instead
51 of 0640. One small step closer to unify distro rules. Some day, all
52 distros hopefully end up with the same set of rules.
54 No symlinks to udevadm are installed anymore, if they are still needed,
55 they should be provided by the package.
61 Default udev rules, which are not supposed to be edited by the user, should
62 be placed in /lib/udev/rules.d/ now, to make it clear that they are private to
63 the udev package and will be replaced with an update. Udev will pick up rule
65 /lib/udev/rules.d/ - default installed rules
66 /etc/udev/rules.d/ - user rules + on-the-fly generated rules
67 /dev/.udev/rules.d/ - temporary non-persistent rules created after bootup
68 It does not matter in which directory a rule file lives, all files are sorted
71 To help creating /dev/root, we have now:
72 $ udevadm info --export --export-prefix="ROOT_" --device-id-of-file=/
75 In case the current --device-id-of-file is already used, please switch to
76 the --export format version, it saves the output parsing and the old
77 format will be changed to use ':' as a separator, like the format in the
82 Fix cdrom_id to properly recognize blank media.
88 Tape drive id-data is queried from /dev/bsg/* instead of the tape
89 nodes. This avoids rewinding tapes on open().
95 The symlinks udevcontrol and udevtrigger are no longer installed by
98 The scsi_id program does not depend on sysfs anymore. It can speak
99 SGv4 now, so /dev/bsg/* device nodes can be used, to query SCSI device
100 data, which should solve some old problems with tape devices, where
101 we better do not open all tape device nodes to identify the device.
107 The cdrom_id program is replaced by an advanced version, which can
108 detect most common device types, and also properties of the inserted
109 media. This is part of moving some basic functionality from HAL into
110 udev (and the kernel).
116 The last WAIT_FOR_SYSFS rule is removed from the default rules.
118 The symlinks to udevadm for the debugging tools: udevmonitor and
119 udevtest are no longer created.
121 The symlinks to the udevadm man page for the old tool names are
124 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
125 should be prefixed with '@' to indicate that the path is not a
136 Udevstart is removed from the tree, it did not get installed for
137 a long time now, and is long replaced by trigger and settle.
143 All udev tools are merged into a single binary called udevadm.
144 The old names of the tools are built-in commands in udevadm now.
145 Symlinks to udevadm, with the names of the old tools, provide
146 the same functionality as the standalone tools. There is also
147 only a single udevadm.8 man page left for all tools.
149 Tools like mkinitramfs should be checked, if they need to include
150 udevadm in the list of files.
160 The etc/udev/rules.d/ directory now contains a default set of basic
161 udev rules. This initial version is the result of a rules file merge
162 of Fedora and openSUSE. For these both distros only a few specific
163 rules are left in their own file, named after the distro. Rules which
164 are optionally installed, because they are only valid for a specific
165 architecture, or rules for subsystems which are not always used are
166 in etc/udev/packages/.
172 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
173 actions by dynamically created rules.
175 SYMLINK=="<value>" matches agains the entries in the list of
176 currently defined symlinks. The links are not created in the
177 filesystem at that point in time, but the values can be matched.
179 RUN{ignore_error}+="<program>" will ignore any exit code from the
180 program and not record as a failed event.
186 Final merge of patches/features from the Ubuntu package.
192 Control characters in filesystem label strings are no longer silenty
193 removed, but hex-encoded, to be able to uniquely identify the device
194 by its symlink in /dev/disk/by-label/.
195 If libvolume_id is used by mount(8), LABEL= will work as expected,
196 if slashes or other characters are used in the label string.
198 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
199 can be specified now. The TEST key accepts an optional mode mask
200 TEST{0100}=="<is executable file>".
202 Scsi_id now supports a mode without expecting scsi-specific sysfs
203 entries to allow the extraction of cciss-device persistent properties.
209 In the future, we may see uuid's which are just simple character
210 strings (see the DDF Raid Specification). For that reason vol_id now
211 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
212 the creation of symlinks, the *_SAFE values ensure, that no control
213 or whitespace characters are used in the filename.
215 Possible users of libvolume_id, please use the volume_id_get_* functions.
216 The public struct will go away in a future release of the library.
222 Removal of useless extras/eventrecorder.sh.
232 The directory multiplexer for dev.d/ and hotplug.d are finally removed
233 from the udev package.
239 Symlinks can have priorities now, the priority is assigned to the device
240 and specified with OPTIONS="link_priority=100". Devices with higher
241 priorities overwrite the symlinks of devices with lower priorities.
242 If the device that currently owns the link, goes away, the symlink
243 will be removed, and recreated, pointing to the next device with the
244 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
245 more reliable, if multiple devices contain the same metadata and overwrite
248 The dasd_id program is removed from the udev tree, and dasdinfo, with the
249 needed rules, are part of the s390-tools now.
251 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
252 we may get the scsi sysfs mess fixed some day, and this will only catch
253 the devices we are looking for.
255 USB serial numbers for storage devices have the target:lun now appended,
256 to make it possibble to distinguish broken multi-lun devices with all
257 the same SCSI identifiers.
259 Note: The extra "run_directory" which searches and executes stuff in
260 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
261 with the next release. Make sure, that you don't use it anymore, or
262 provides your own implementation of that inefficient stuff.
263 We are tired of reports about a "slow udev", because these directories
264 contain stuff, that runs with _every_ event, instead of using rules,
265 that run programs only for the matching events.
275 DRIVER== will match only for devices that actually have a real
276 driver. DRIVERS== must be used, if parent devices should be
277 included in the match.
279 Libvolume_id's "linux_raid" detection needed another fix.
287 Add additional check to volume_id detection of via_raid, cause
288 some company decided to put a matching pattern all over the empty
289 storage area of their music players.
293 Fix path_id for SAS devices.
297 The udev daemon can be started with --debug-trace now, which will
298 execute all events serialized to get a chance to catch a possible
299 action that crashes the box.
301 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
302 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
303 are excluded from the warning. Referencing parent attributes directly
304 may break when something in the kernel driver model changes. Udev will
305 just find the attribute by walking up the parent chain.
307 Udevtrigger now sorts the list of devices depending on the device
308 dependency, so a "usb" device is triggered after the parent "pci"
313 Revert persistent-storage ata-serial '_' '-' replacement.
319 Udevtrigger can now filter the list of devices to be triggered. Matches
320 for subsystems or sysfs attributes can be specified.
322 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
323 zero-sized files to avoid pointing to /sys and confuse broken tools which
324 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
327 The rules and scripts to create udev rules for persistent network
328 devices and optical drives are in the extras/rules_generator directory
329 now. If you use something similar, please consider replacing your own
330 version with this, to share the support effort. The rule_generator
331 installs its own rules into /etc/udev/rules.d.
333 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
334 the rule_generator depends on cdrom_id to be called in an earlier rule.
340 Renaming of some key names (the old names still work):
341 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
342 (The behavior of the key DRIVER will change soon in one of the next
343 releases, to match only the event device, please switch to DRIVERS
344 instead. If DRIVER is used, it will behave like DRIVERS, but an error
346 With the new key names, we have a more consistent and simpler scheme.
347 We can match the properties of the event device only, with: KERNEL,
348 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
349 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
350 longer mentioned in the man page and should be switched in the rule
353 ATTR{file}="value" can be used now, to write to a sysfs file of the
354 event device. Instead of:
355 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
357 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
359 All the PHYSDEV* keys are deprecated and will be removed from a
361 PHYDEVPATH - is the path of a parent device and should not be
363 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
364 matched with SUBSYSTEMS==
365 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
366 Newer kernels will have DRIVER in the environment,
367 for older kernels udev puts in. Class device will
368 no longer carry this property of a parent and
369 DRIVERS== can be used to match such a parent value.
370 Note that ENV{DRIVER} is only available for a few bus devices, where
371 the driver is already bound at device event time. On coldplug, the
372 events for a lot devices are already bound to a driver, and they will have
373 that value set. But on hotplug, at the time the kernel creates the device,
374 it can't know what driver may claim the device after that, therefore
375 in most cases it will be empty.
377 Failed events should now be re-triggered with:
378 udevtrigger --retry-failed.
379 Please switch to this command, so we keep the details of the /dev/.udev/failed/
380 files private to the udev tools. We may need to switch the current symlink
381 target, cause some obviously broken tools try to scan all files in /dev
382 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
383 million times. This takes ages on slow boxes.
385 The udevinfo attribute walk (-a) now works with giving a device node
386 name (-n) instead of a devpath (-p). The query now always works, also when
387 no database file was created by udev.
389 The built-in /etc/passwd /etc/group parser is removed, we always depend on
390 getpwnam() and getgrnam() now. One of the next releases will depend on
391 fnmatch() and may use getopt_long().
395 Bugfixes and small improvements.
399 Fix path_id for recent kernels.
405 Added support for swapping network interface names, by temporarily
406 renaming the device and wait for the target name to become free.
410 The built-in MODALIAS key and substitution is removed.
414 The binary firmware helper is replaced by the usual simple
415 shell script. Udevsend is removed from the tree.
423 Some more keys require the correct use of '==' and '=' depending
424 on the kind of operation beeing an assignment or a match. Rules
425 with invalid operations are skipped and logged to syslog. Please
426 test with udevtest if the parsing of your rules throws errors and
427 fix possibly broken rules.
431 Provide "udevsettle" to wait for all current udev events to finish.
432 It also watches the current kernel netlink queue by comparing the
433 even sequence number to make sure that there are no current pending
434 events that have not already arrived in the daemon.
438 Fix rule to skip persistent rules for removable IDE devices, which
439 also skipped optical IDE drives.
441 All *_id program are installed in /lib/udev/ by default now.
443 No binary is stripped anymore as this should be done in the
444 packaging process and not at build time.
446 libvolume_id is provided as a shared library now and vol_id is
447 linked against it. Also one of the next HAL versions will require
448 this library, and the HAL build process will also require the
449 header file to be installed. The copy of the same code in HAL will
450 be removed to have only a single copy left on the system.
454 Add persistent links for SCSI tapes. The rules file is renamed
455 to 60-persistent-storage.rules.
457 Create persistent path for usb devices. Can be used for all sorts
458 of devices that can't be distinguished by other properties like
459 multiple identical keyboards and mice connected to the same box.
461 Provide "udevtrigger" program to request events on coldplug. The
462 shell script is much too slow with thousends of devices.
466 Fix persistent disk rules to exclude removable IDE drives.
468 Warn if %e, $modalias or MODALIAS is used.
472 Fix queue export, which wasn't correct for subsequent add/remove
473 events for the same device.
477 Fix cramfs detection on big endian.
479 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
484 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
485 attributes were only checked at the parent device that matched the
486 by BUS requested subsystem. Fix it to also look at the device we
487 received the event for.
489 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
494 Fix a bug where NAME="" would prevent RUN from beeing executed.
496 RUN="/bin/program" does not longer automatically add the subsystem
497 as the first parameter. This is from the days of /sbin/hotplug
498 which is dead now and it's just confusing to need to add a space at
499 the end of the program name to prevent this.
500 If you use rules that need the subsystem as the first parameter,
501 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
502 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
506 The udev man page has moved to udev(7) as it does not describe a command
507 anymore. The programs udev, udevstart and udevsend are no longer installed
508 by default and must be copied manually, if they should be installed or
509 included in a package.
511 Fix a bug where "ignore_device" could run earlier collected RUN keys before
512 the ignore rule was applied.
514 More preparation for future sysfs changes. usb_id and scsi_id no longer
515 depend on a magic order of devices in the /devices chain. Specific devices
516 should be requested by their subsytem.
518 This will always find the scsi parent device without depending on a specific
520 dev = sysfs_device_get(devpath);
521 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
523 The "device" link in the current sysfs layout will be automatically
524 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
525 parent in the devpath. If a device is requested by it's symlink, like all
526 class devices in the new sysfs layout will look like, it gets automatically
527 resolved and substituted with the real devpath and not the symlink path.
530 A similar logic must be applied to _all_ sysfs users, including
531 scripts, that search along parent devices in sysfs. The explicit use of
532 the "device" link must be avoided. With the future sysfs layout all
533 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
534 back to the "class" or the "bus". The layout of the parent devices in
535 /devices is not necessarily expected to be stable across kernel releases and
536 searching for parents by their subsystem should make sysfs users tolerant
537 for changed parent chains.
541 Prepare udev to work with the experimental kernel patch, that moves
542 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
544 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
545 moving the class devices to /sys/devices.
547 Thanks again to Marco for help finding a hopefully nice compromise
548 to make %b simpler and working again.
552 Complete removal of libsysfs, replaced by simple helper functions
553 which are much simpler and a bit faster. The udev daemon operatesentirely
554 on event parameters and does not use sysfs for simple rules anymore.
555 Please report any new bugs/problems, that may be caused by this big
556 change. They will be fixed immediately.
558 The enumeration format character '%e' is deprecated and will be
559 removed sometimes from a future udev version. It never worked correctly
560 outside of udevstart, so we can't use it with the new parallel
561 coldplug. A simple enumeration is as useless as the devfs naming
562 scheme, just get rid of both if you still use it.
564 MODALIAS and $modalias is not needed and will be removed from one of
565 the next udev versions, replace it in all rules with ENV{MODALIAS} or
566 the sysfs "modalias" value.
568 Thanks a lot to Marco for all his help on finding and fixing bugs.
572 Let scsi_id request libata drive serial numbers from page 0x80.
574 Renamed etc/udev/persistent.rules to persistent-disk.rules and
575 added /dev/disk/by-name/* for device mapper device names.
577 Removed %e from the man page. It never worked reliably outside
578 of udevstart and udevstart is no longer recommended to use.
582 Symlinks are now exported to the event environment. Hopefully it's no
583 longer needed to run udevinfo from an event process, like it was
584 mentioned on the hotplug list:
585 UDEV [1134776873.702967] add@/block/sdb
588 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
592 Fix a problem if udevsend is used as the hotplug handler and tries to use
593 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
594 and this kind of problems will hopefully go away soon.
598 All built-in logic to work around bad sysfs timing is removed with this
599 version. The need to wait for sysfs files is almost fixed with a kernel
600 version that doesn't work with this udev version anyway. Until we fix
601 the timing of the "bus" link creation, the former integrated logic should
602 be emulated by a rule placed before all other rules:
603 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
605 The option "udev_db" does no longer exist. All udev state will be in
606 /$udev_root/.udev/ now, there is no longer an option to set this
608 If the init script or something else used this value, just depend on
609 this hardcoded path. But remember _all_content_ of this directory is
610 still private to udev and can change at any time.
612 Default location for rule sripts and helper programs is now: /lib/udev/.
613 Everything that is not useful on the commandline should go into this
614 directory. Some of the helpers in the extras folder are installed there
615 now. The rules need to be changed, to find the helpers there.
617 Also /lib/udev/devices is recommended as a directory where packages or
618 the user can place real device nodes, which get copied over to /dev at
619 every boot. This should replace the various solutions with custom config
622 Udevsend does no longer start the udev daemon. This must be done with
623 the init script that prepares /dev on tmpfs and creates the initial nodes,
624 before starting the daemon.
628 Silent a too verbose error logging for the old hotplug.d/ dev.d/
631 The copy of klibc is removed. A systemwide installed version of klibc
632 should be used to build a klibc udev now.
636 NAME="" will not create any nodes, but execute RUN keys. To completely
637 ignore an event the OPTION "ignore_device" should be used.
639 After removal of the reorder queue, events with a TIMEOUT can be executed
640 without any queuing now.
644 Fixed bug in udevd, if inotify is not available. We depend on netlink
645 uevents now, kernels without that event source will not work with that
646 version of udev anymore.
650 The rule parsing happens now in the daemon once at startup, all udev
651 event processes inherit the already parsed rules from the daemon.
652 It is shipped with SUSE10.0 and reduces heavily the system load at
653 startup. The option to save precompiled rules and let the udev process
654 pick the them up is removed, as it's no longer needed.
656 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
657 device. Libsysfs is changed to "translate" the requested link into the
658 real device path, as it would happen with the hotplug event. Otherwise
659 device removal and the udev database will not work.
661 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
664 A few improvements for vol_id, the filesytem probing code.
668 Fix a stupid typo in extras/run_directory for "make install".
670 scsi_id creates the temporary devnode now in /dev for usage with a
671 non-writable /tmp directory.
673 The uevent kernel socket buffer can carry app. 50.000 events now,
674 let's see who can break this again. :)
676 The upcoming kernel will have a new input driver core integration.
677 Some class devices are now symlinks to the real device. libsysfs
678 needs a fix for this to work correctly. Udevstart of older udev
679 versions will _not_ create these devices!
683 Fix a 'install' target in the Makefile, that prevents EXTRAS from
688 A bunch of mostly trivial bugfixes. From now on no node name or
689 symlink name can contain any character than plain whitelisted ascii
690 characters or validated utf8 byte-streams. This is needed for the
691 /dev/disk/by-label/* links, because we import untrusted data and
692 export it to the filesystem.
696 More bugfixes. If udevd was started from the kernel, we don't
697 have stdin/stdout/stderr, which broke the forked tools in some
702 Bugfix. udevstart event ordering was broken for a long time.
703 The new run_program() uncovered it, because /dev/null was not
704 available while we try to run external programs.
705 Now udevstart should create it before we run anything.
709 Minor bugfixes and some distro rules updates. If you don't have the
710 persistent disk rules in /dev/disk/by-*/* on your distro, just
711 grab it from here. :)
715 We can use socket communication now to pass events from udev to
717 RUN+="socket:/org/freedesktop/hal/udev_event"
718 will pass the whole udev event to the HAL daemon without the need
719 for a forked helper. (See ChangeLog for udevmonitor, as an example)
723 Mostly bugfixes and see ChangeLog.
725 The test for the existence of an environment value should be
727 ENV{KEY}=="*" to ENV{KEY}=="?*"
728 because "*" will not fail anymore, if the key does not exist or
733 Bugfixes and a few tweaks described in the ChangeLog.
737 Mostly a Bugfix release.
739 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
740 timing with custom rules.
744 We changed the internal rule storage format. Our large rule files took
745 2 MB of RAM, with the change we are down to 99kB.
747 If the device-node has been created with default name and no symlink or
748 options are to remenber, it is not longer stored in the udevdb. HAL will
749 need to be updated to work correctly with that change.
751 To overrride optimization flags, OPTFLAGS may be used now.
759 Major changes happened with this release. The goal is to take over the
760 complete kernel-event handling and provide a more efficient way to dispatch
761 kernel events. Replacing most of the current shell script logic and the
762 kernel forked helper with a netlink-daemon and a rule-based event handling.
764 o udevd listens to netlink events now. The first valid netlink event
765 will make udevd ignore any message from udevsend that contains a
766 SEQNUM, to avoid duplicate events. The forked events can be disabled
768 echo "" > /proc/sys/kernel/hotplug
769 For full support, the broken input-subsytem needs to be fixed, not to
770 bypass the driver core.
772 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
773 removed from udev itself and must be emulated by calling small
774 helper binaries provided in the extras folder:
775 make EXTRAS=extras/run_directory/
776 will build udev_run_devd and udev_run_hotplugd, which can be called
777 from a rule if needed:
778 RUN+="/sbin/udev_run_hotplugd"
779 The recommended way to handle this is to convert all the calls from
780 the directories to explicit udev rules and get completely rid of the
781 multiplexing. (To catch a ttyUSB event, you now no longer need to
782 fork and exit 300 tty script instances you are not interested in, it
783 is just one rule that matches exactly the device.)
785 o udev handles now _all_ events not just events for class and block
786 devices, this way it is possible to control the complete event
787 behavior with udev rules. Especially useful for rules like:
788 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
790 o As used in the modalias rule, udev supports now textual
791 substitution placeholder along with the usual format chars. This
792 needs to be documented, for now it's only visible in udev_rules_parse.c.
794 o The rule keys support now more operations. This is documented in the
795 man page. It is possible to add values to list-keys like the SYMLINK
796 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
797 Also "final"-assignments are supported by using KEY:="value", which will
798 prevent changing the key by any later rule.
800 o kernel 2.6.12 has the "detached_state" attribute removed from
801 sysfs, which was used to recognize sysfs population. We switched that
802 to wait for the "bus" link, which is only available in kernels after 2.6.11.
803 Running this udev version on older kernels may cause a short delay for
806 o To provide infrastructure for persistent device naming, the id programs:
807 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
808 to export the probed data in environment key format:
809 pim:~ # /sbin/ata_id --export /dev/hda
810 ID_MODEL=HTS726060M9AT00
811 ID_SERIAL=MRH401M4G6UM9B
815 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
816 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
819 kay@pim:~> tree /dev/disk
822 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
823 | `-- IBM-Memory_Key -> ../../sda
825 | |-- swap -> ../../hda1
826 | |-- date -> ../../sda1
827 | `-- home -> ../../hda3
829 |-- 2E08712B0870F2E7 -> ../../hda3
830 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
831 |-- E845-7A89 -> ../../sda1
832 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
834 The IMPORT= operation will import these keys in the environment and make
835 it available for later PROGRAM= and RUN= executed programs. The keys are
836 also stored in the udevdb and can be queried from there with one of the
839 o A few binaries are silently added to the repository, which can be used
840 to replay kernel events from initramfs instead of using coldplug. udevd
841 can be instructed now to queue-up events while the stored events from
842 initramfs are filled into the udevd-queue. This code is still under
843 development and there is no documentation now besides the code itself.
844 The additional binaries get compiled, but are not installed by default.
846 o There is also a temporary fix for a performance problem where too many
847 events happen in parallel and every event needs to parse the rules.
848 udev can now read precompiled rules stored on disk. This is likely to be
849 replaced by a more elegant solution in a future udev version.
853 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
854 Fix for libsysfs not to expect this file was added.
858 All rules are applied now, but only the first matching rule with a NAME-key
859 will be applied. All later rules with NAME-key are completely ignored. This
860 way system supplied symlinks or permissions gets applied to user-defined
864 Please check your rules setup, if you may need to add OPTIONS="last_rule"
865 to some rules, to keep the old behavior.
867 The rules are read on "remove"-events too. That makes is possible to match
868 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
869 instruct udev to ignore an event (OPTIONS="ignore_device").
870 The new ACTION-key may be used to let a rule act only at a "remove"-event.
872 The new RUN-key supports rule-based execution of programs after device-node
873 handling. This is meant as a general replacement for the dev.d/-directories
874 to give fine grained control over the execution of programs.
876 The %s{}-sysfs format char replacement values are searched at any of the
877 devices in the device chain now, not only at the class-device.
879 We support log priority levels now. The value udev_log in udev.conf is used
880 to determine what is printed to syslog. This makes it possible to
881 run a version with compiled-in debug messages in a production environment
882 which is sometimes needed to find a bug.
883 It is still possible to supress the inclusion of _any_ syslog usage with
884 USE_LOG=false to create the smallest possible binaries if needed.
885 The configured udev_log value can be overridden with the environment variable
890 Possible use of a system-wide klibc:
891 make USE_KLIBC=true KLCC=/usr/bin/klcc all
892 will link against an external klibc and our own version will be ignored.
896 We support an unlimited count of symlinks now.
898 If USE_STATIC=true is passed to a glibc build, we link statically and use
899 a built-in userdb parser to resolve user and group names.
901 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
902 we walk up the chain of physical devices to find a match.
904 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
905 easy to skip certain attribute matches without composing rules with weird
906 character class negations like:
907 KERNEL="[!s][!c][!d]*"
908 this can now be replaced with:
910 The current simple '=' is still supported, and should work as it does today,
911 but existing rules should be converted if possible, to be better readable.
913 We have new ENV{}== key now, to match against a maximum of 5 environment
916 udevstart is its own binary again, because we don't need co carry this araound
917 with every forked event.
~ianmdlvl / elogind.git / blob