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.
9 The old udev commands symlinks to udevadm are not installed, if
10 these symlinks are used, a warning is printed.
16 Optical drive's media is no longer probed for raid signatures,
17 reading the end of the device causes some devices to malfunction.
18 Also the offset of the last session found is used now to probe
21 The volume_id library got a major version number update to 1,
22 some deprecated functions are removed.
24 A shared library "libudev" gets installed now to provide access
25 to udev device information. DeviceKit, the successor of HAL, will
26 need this library to access the udev database and search sysfs for
28 The library is currently in an experimental state, also the API is
29 expected to change, as long as the DeviceKit integration is not
34 We use ./configure now. See INSTALL for details. Current
37 "/usr" - prefix for man pages, include files
39 "" - the root filesystem, prefix for libs and binaries
43 "lib" - directory name for libraries, not a path name
44 multilib 64bit systems may use "lib64" instead of "lib"
46 compile-in verbose debug messages
48 disable all logging and compile-out all log strings
50 link against SELInux libraries, to set the expected context
53 In the default rules, the group "disk" gets permissions 0660 instead
54 of 0640. One small step closer to unify distro rules. Some day, all
55 distros hopefully end up with the same set of rules.
57 No symlinks to udevadm are installed anymore, if they are still needed,
58 they should be provided by the package.
64 Default udev rules, which are not supposed to be edited by the user, should
65 be placed in /lib/udev/rules.d/ now, to make it clear that they are private to
66 the udev package and will be replaced with an update. Udev will pick up rule
68 /lib/udev/rules.d/ - default installed rules
69 /etc/udev/rules.d/ - user rules + on-the-fly generated rules
70 /dev/.udev/rules.d/ - temporary non-persistent rules created after bootup
71 It does not matter in which directory a rule file lives, all files are sorted
74 To help creating /dev/root, we have now:
75 $ udevadm info --export --export-prefix="ROOT_" --device-id-of-file=/
78 In case the current --device-id-of-file is already used, please switch to
79 the --export format version, it saves the output parsing and the old
80 format will be changed to use ':' as a separator, like the format in the
85 Fix cdrom_id to properly recognize blank media.
91 Tape drive id-data is queried from /dev/bsg/* instead of the tape
92 nodes. This avoids rewinding tapes on open().
98 The symlinks udevcontrol and udevtrigger are no longer installed by
101 The scsi_id program does not depend on sysfs anymore. It can speak
102 SGv4 now, so /dev/bsg/* device nodes can be used, to query SCSI device
103 data, which should solve some old problems with tape devices, where
104 we better do not open all tape device nodes to identify the device.
110 The cdrom_id program is replaced by an advanced version, which can
111 detect most common device types, and also properties of the inserted
112 media. This is part of moving some basic functionality from HAL into
113 udev (and the kernel).
119 The last WAIT_FOR_SYSFS rule is removed from the default rules.
121 The symlinks to udevadm for the debugging tools: udevmonitor and
122 udevtest are no longer created.
124 The symlinks to the udevadm man page for the old tool names are
127 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
128 should be prefixed with '@' to indicate that the path is not a
139 Udevstart is removed from the tree, it did not get installed for
140 a long time now, and is long replaced by trigger and settle.
146 All udev tools are merged into a single binary called udevadm.
147 The old names of the tools are built-in commands in udevadm now.
148 Symlinks to udevadm, with the names of the old tools, provide
149 the same functionality as the standalone tools. There is also
150 only a single udevadm.8 man page left for all tools.
152 Tools like mkinitramfs should be checked, if they need to include
153 udevadm in the list of files.
163 The etc/udev/rules.d/ directory now contains a default set of basic
164 udev rules. This initial version is the result of a rules file merge
165 of Fedora and openSUSE. For these both distros only a few specific
166 rules are left in their own file, named after the distro. Rules which
167 are optionally installed, because they are only valid for a specific
168 architecture, or rules for subsystems which are not always used are
169 in etc/udev/packages/.
175 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
176 actions by dynamically created rules.
178 SYMLINK=="<value>" matches agains the entries in the list of
179 currently defined symlinks. The links are not created in the
180 filesystem at that point in time, but the values can be matched.
182 RUN{ignore_error}+="<program>" will ignore any exit code from the
183 program and not record as a failed event.
189 Final merge of patches/features from the Ubuntu package.
195 Control characters in filesystem label strings are no longer silenty
196 removed, but hex-encoded, to be able to uniquely identify the device
197 by its symlink in /dev/disk/by-label/.
198 If libvolume_id is used by mount(8), LABEL= will work as expected,
199 if slashes or other characters are used in the label string.
201 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
202 can be specified now. The TEST key accepts an optional mode mask
203 TEST{0100}=="<is executable file>".
205 Scsi_id now supports a mode without expecting scsi-specific sysfs
206 entries to allow the extraction of cciss-device persistent properties.
212 In the future, we may see uuid's which are just simple character
213 strings (see the DDF Raid Specification). For that reason vol_id now
214 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
215 the creation of symlinks, the *_SAFE values ensure, that no control
216 or whitespace characters are used in the filename.
218 Possible users of libvolume_id, please use the volume_id_get_* functions.
219 The public struct will go away in a future release of the library.
225 Removal of useless extras/eventrecorder.sh.
235 The directory multiplexer for dev.d/ and hotplug.d are finally removed
236 from the udev package.
242 Symlinks can have priorities now, the priority is assigned to the device
243 and specified with OPTIONS="link_priority=100". Devices with higher
244 priorities overwrite the symlinks of devices with lower priorities.
245 If the device that currently owns the link, goes away, the symlink
246 will be removed, and recreated, pointing to the next device with the
247 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
248 more reliable, if multiple devices contain the same metadata and overwrite
251 The dasd_id program is removed from the udev tree, and dasdinfo, with the
252 needed rules, are part of the s390-tools now.
254 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
255 we may get the scsi sysfs mess fixed some day, and this will only catch
256 the devices we are looking for.
258 USB serial numbers for storage devices have the target:lun now appended,
259 to make it possibble to distinguish broken multi-lun devices with all
260 the same SCSI identifiers.
262 Note: The extra "run_directory" which searches and executes stuff in
263 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
264 with the next release. Make sure, that you don't use it anymore, or
265 provides your own implementation of that inefficient stuff.
266 We are tired of reports about a "slow udev", because these directories
267 contain stuff, that runs with _every_ event, instead of using rules,
268 that run programs only for the matching events.
278 DRIVER== will match only for devices that actually have a real
279 driver. DRIVERS== must be used, if parent devices should be
280 included in the match.
282 Libvolume_id's "linux_raid" detection needed another fix.
290 Add additional check to volume_id detection of via_raid, cause
291 some company decided to put a matching pattern all over the empty
292 storage area of their music players.
296 Fix path_id for SAS devices.
300 The udev daemon can be started with --debug-trace now, which will
301 execute all events serialized to get a chance to catch a possible
302 action that crashes the box.
304 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
305 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
306 are excluded from the warning. Referencing parent attributes directly
307 may break when something in the kernel driver model changes. Udev will
308 just find the attribute by walking up the parent chain.
310 Udevtrigger now sorts the list of devices depending on the device
311 dependency, so a "usb" device is triggered after the parent "pci"
316 Revert persistent-storage ata-serial '_' '-' replacement.
322 Udevtrigger can now filter the list of devices to be triggered. Matches
323 for subsystems or sysfs attributes can be specified.
325 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
326 zero-sized files to avoid pointing to /sys and confuse broken tools which
327 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
330 The rules and scripts to create udev rules for persistent network
331 devices and optical drives are in the extras/rules_generator directory
332 now. If you use something similar, please consider replacing your own
333 version with this, to share the support effort. The rule_generator
334 installs its own rules into /etc/udev/rules.d.
336 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
337 the rule_generator depends on cdrom_id to be called in an earlier rule.
343 Renaming of some key names (the old names still work):
344 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
345 (The behavior of the key DRIVER will change soon in one of the next
346 releases, to match only the event device, please switch to DRIVERS
347 instead. If DRIVER is used, it will behave like DRIVERS, but an error
349 With the new key names, we have a more consistent and simpler scheme.
350 We can match the properties of the event device only, with: KERNEL,
351 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
352 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
353 longer mentioned in the man page and should be switched in the rule
356 ATTR{file}="value" can be used now, to write to a sysfs file of the
357 event device. Instead of:
358 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
360 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
362 All the PHYSDEV* keys are deprecated and will be removed from a
364 PHYDEVPATH - is the path of a parent device and should not be
366 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
367 matched with SUBSYSTEMS==
368 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
369 Newer kernels will have DRIVER in the environment,
370 for older kernels udev puts in. Class device will
371 no longer carry this property of a parent and
372 DRIVERS== can be used to match such a parent value.
373 Note that ENV{DRIVER} is only available for a few bus devices, where
374 the driver is already bound at device event time. On coldplug, the
375 events for a lot devices are already bound to a driver, and they will have
376 that value set. But on hotplug, at the time the kernel creates the device,
377 it can't know what driver may claim the device after that, therefore
378 in most cases it will be empty.
380 Failed events should now be re-triggered with:
381 udevtrigger --retry-failed.
382 Please switch to this command, so we keep the details of the /dev/.udev/failed/
383 files private to the udev tools. We may need to switch the current symlink
384 target, cause some obviously broken tools try to scan all files in /dev
385 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
386 million times. This takes ages on slow boxes.
388 The udevinfo attribute walk (-a) now works with giving a device node
389 name (-n) instead of a devpath (-p). The query now always works, also when
390 no database file was created by udev.
392 The built-in /etc/passwd /etc/group parser is removed, we always depend on
393 getpwnam() and getgrnam() now. One of the next releases will depend on
394 fnmatch() and may use getopt_long().
398 Bugfixes and small improvements.
402 Fix path_id for recent kernels.
408 Added support for swapping network interface names, by temporarily
409 renaming the device and wait for the target name to become free.
413 The built-in MODALIAS key and substitution is removed.
417 The binary firmware helper is replaced by the usual simple
418 shell script. Udevsend is removed from the tree.
426 Some more keys require the correct use of '==' and '=' depending
427 on the kind of operation beeing an assignment or a match. Rules
428 with invalid operations are skipped and logged to syslog. Please
429 test with udevtest if the parsing of your rules throws errors and
430 fix possibly broken rules.
434 Provide "udevsettle" to wait for all current udev events to finish.
435 It also watches the current kernel netlink queue by comparing the
436 even sequence number to make sure that there are no current pending
437 events that have not already arrived in the daemon.
441 Fix rule to skip persistent rules for removable IDE devices, which
442 also skipped optical IDE drives.
444 All *_id program are installed in /lib/udev/ by default now.
446 No binary is stripped anymore as this should be done in the
447 packaging process and not at build time.
449 libvolume_id is provided as a shared library now and vol_id is
450 linked against it. Also one of the next HAL versions will require
451 this library, and the HAL build process will also require the
452 header file to be installed. The copy of the same code in HAL will
453 be removed to have only a single copy left on the system.
457 Add persistent links for SCSI tapes. The rules file is renamed
458 to 60-persistent-storage.rules.
460 Create persistent path for usb devices. Can be used for all sorts
461 of devices that can't be distinguished by other properties like
462 multiple identical keyboards and mice connected to the same box.
464 Provide "udevtrigger" program to request events on coldplug. The
465 shell script is much too slow with thousends of devices.
469 Fix persistent disk rules to exclude removable IDE drives.
471 Warn if %e, $modalias or MODALIAS is used.
475 Fix queue export, which wasn't correct for subsequent add/remove
476 events for the same device.
480 Fix cramfs detection on big endian.
482 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
487 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
488 attributes were only checked at the parent device that matched the
489 by BUS requested subsystem. Fix it to also look at the device we
490 received the event for.
492 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
497 Fix a bug where NAME="" would prevent RUN from beeing executed.
499 RUN="/bin/program" does not longer automatically add the subsystem
500 as the first parameter. This is from the days of /sbin/hotplug
501 which is dead now and it's just confusing to need to add a space at
502 the end of the program name to prevent this.
503 If you use rules that need the subsystem as the first parameter,
504 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
505 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
509 The udev man page has moved to udev(7) as it does not describe a command
510 anymore. The programs udev, udevstart and udevsend are no longer installed
511 by default and must be copied manually, if they should be installed or
512 included in a package.
514 Fix a bug where "ignore_device" could run earlier collected RUN keys before
515 the ignore rule was applied.
517 More preparation for future sysfs changes. usb_id and scsi_id no longer
518 depend on a magic order of devices in the /devices chain. Specific devices
519 should be requested by their subsytem.
521 This will always find the scsi parent device without depending on a specific
523 dev = sysfs_device_get(devpath);
524 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
526 The "device" link in the current sysfs layout will be automatically
527 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
528 parent in the devpath. If a device is requested by it's symlink, like all
529 class devices in the new sysfs layout will look like, it gets automatically
530 resolved and substituted with the real devpath and not the symlink path.
533 A similar logic must be applied to _all_ sysfs users, including
534 scripts, that search along parent devices in sysfs. The explicit use of
535 the "device" link must be avoided. With the future sysfs layout all
536 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
537 back to the "class" or the "bus". The layout of the parent devices in
538 /devices is not necessarily expected to be stable across kernel releases and
539 searching for parents by their subsystem should make sysfs users tolerant
540 for changed parent chains.
544 Prepare udev to work with the experimental kernel patch, that moves
545 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
547 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
548 moving the class devices to /sys/devices.
550 Thanks again to Marco for help finding a hopefully nice compromise
551 to make %b simpler and working again.
555 Complete removal of libsysfs, replaced by simple helper functions
556 which are much simpler and a bit faster. The udev daemon operatesentirely
557 on event parameters and does not use sysfs for simple rules anymore.
558 Please report any new bugs/problems, that may be caused by this big
559 change. They will be fixed immediately.
561 The enumeration format character '%e' is deprecated and will be
562 removed sometimes from a future udev version. It never worked correctly
563 outside of udevstart, so we can't use it with the new parallel
564 coldplug. A simple enumeration is as useless as the devfs naming
565 scheme, just get rid of both if you still use it.
567 MODALIAS and $modalias is not needed and will be removed from one of
568 the next udev versions, replace it in all rules with ENV{MODALIAS} or
569 the sysfs "modalias" value.
571 Thanks a lot to Marco for all his help on finding and fixing bugs.
575 Let scsi_id request libata drive serial numbers from page 0x80.
577 Renamed etc/udev/persistent.rules to persistent-disk.rules and
578 added /dev/disk/by-name/* for device mapper device names.
580 Removed %e from the man page. It never worked reliably outside
581 of udevstart and udevstart is no longer recommended to use.
585 Symlinks are now exported to the event environment. Hopefully it's no
586 longer needed to run udevinfo from an event process, like it was
587 mentioned on the hotplug list:
588 UDEV [1134776873.702967] add@/block/sdb
591 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
595 Fix a problem if udevsend is used as the hotplug handler and tries to use
596 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
597 and this kind of problems will hopefully go away soon.
601 All built-in logic to work around bad sysfs timing is removed with this
602 version. The need to wait for sysfs files is almost fixed with a kernel
603 version that doesn't work with this udev version anyway. Until we fix
604 the timing of the "bus" link creation, the former integrated logic should
605 be emulated by a rule placed before all other rules:
606 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
608 The option "udev_db" does no longer exist. All udev state will be in
609 /$udev_root/.udev/ now, there is no longer an option to set this
611 If the init script or something else used this value, just depend on
612 this hardcoded path. But remember _all_content_ of this directory is
613 still private to udev and can change at any time.
615 Default location for rule sripts and helper programs is now: /lib/udev/.
616 Everything that is not useful on the commandline should go into this
617 directory. Some of the helpers in the extras folder are installed there
618 now. The rules need to be changed, to find the helpers there.
620 Also /lib/udev/devices is recommended as a directory where packages or
621 the user can place real device nodes, which get copied over to /dev at
622 every boot. This should replace the various solutions with custom config
625 Udevsend does no longer start the udev daemon. This must be done with
626 the init script that prepares /dev on tmpfs and creates the initial nodes,
627 before starting the daemon.
631 Silent a too verbose error logging for the old hotplug.d/ dev.d/
634 The copy of klibc is removed. A systemwide installed version of klibc
635 should be used to build a klibc udev now.
639 NAME="" will not create any nodes, but execute RUN keys. To completely
640 ignore an event the OPTION "ignore_device" should be used.
642 After removal of the reorder queue, events with a TIMEOUT can be executed
643 without any queuing now.
647 Fixed bug in udevd, if inotify is not available. We depend on netlink
648 uevents now, kernels without that event source will not work with that
649 version of udev anymore.
653 The rule parsing happens now in the daemon once at startup, all udev
654 event processes inherit the already parsed rules from the daemon.
655 It is shipped with SUSE10.0 and reduces heavily the system load at
656 startup. The option to save precompiled rules and let the udev process
657 pick the them up is removed, as it's no longer needed.
659 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
660 device. Libsysfs is changed to "translate" the requested link into the
661 real device path, as it would happen with the hotplug event. Otherwise
662 device removal and the udev database will not work.
664 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
667 A few improvements for vol_id, the filesytem probing code.
671 Fix a stupid typo in extras/run_directory for "make install".
673 scsi_id creates the temporary devnode now in /dev for usage with a
674 non-writable /tmp directory.
676 The uevent kernel socket buffer can carry app. 50.000 events now,
677 let's see who can break this again. :)
679 The upcoming kernel will have a new input driver core integration.
680 Some class devices are now symlinks to the real device. libsysfs
681 needs a fix for this to work correctly. Udevstart of older udev
682 versions will _not_ create these devices!
686 Fix a 'install' target in the Makefile, that prevents EXTRAS from
691 A bunch of mostly trivial bugfixes. From now on no node name or
692 symlink name can contain any character than plain whitelisted ascii
693 characters or validated utf8 byte-streams. This is needed for the
694 /dev/disk/by-label/* links, because we import untrusted data and
695 export it to the filesystem.
699 More bugfixes. If udevd was started from the kernel, we don't
700 have stdin/stdout/stderr, which broke the forked tools in some
705 Bugfix. udevstart event ordering was broken for a long time.
706 The new run_program() uncovered it, because /dev/null was not
707 available while we try to run external programs.
708 Now udevstart should create it before we run anything.
712 Minor bugfixes and some distro rules updates. If you don't have the
713 persistent disk rules in /dev/disk/by-*/* on your distro, just
714 grab it from here. :)
718 We can use socket communication now to pass events from udev to
720 RUN+="socket:/org/freedesktop/hal/udev_event"
721 will pass the whole udev event to the HAL daemon without the need
722 for a forked helper. (See ChangeLog for udevmonitor, as an example)
726 Mostly bugfixes and see ChangeLog.
728 The test for the existence of an environment value should be
730 ENV{KEY}=="*" to ENV{KEY}=="?*"
731 because "*" will not fail anymore, if the key does not exist or
736 Bugfixes and a few tweaks described in the ChangeLog.
740 Mostly a Bugfix release.
742 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
743 timing with custom rules.
747 We changed the internal rule storage format. Our large rule files took
748 2 MB of RAM, with the change we are down to 99kB.
750 If the device-node has been created with default name and no symlink or
751 options are to remenber, it is not longer stored in the udevdb. HAL will
752 need to be updated to work correctly with that change.
754 To overrride optimization flags, OPTFLAGS may be used now.
762 Major changes happened with this release. The goal is to take over the
763 complete kernel-event handling and provide a more efficient way to dispatch
764 kernel events. Replacing most of the current shell script logic and the
765 kernel forked helper with a netlink-daemon and a rule-based event handling.
767 o udevd listens to netlink events now. The first valid netlink event
768 will make udevd ignore any message from udevsend that contains a
769 SEQNUM, to avoid duplicate events. The forked events can be disabled
771 echo "" > /proc/sys/kernel/hotplug
772 For full support, the broken input-subsytem needs to be fixed, not to
773 bypass the driver core.
775 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
776 removed from udev itself and must be emulated by calling small
777 helper binaries provided in the extras folder:
778 make EXTRAS=extras/run_directory/
779 will build udev_run_devd and udev_run_hotplugd, which can be called
780 from a rule if needed:
781 RUN+="/sbin/udev_run_hotplugd"
782 The recommended way to handle this is to convert all the calls from
783 the directories to explicit udev rules and get completely rid of the
784 multiplexing. (To catch a ttyUSB event, you now no longer need to
785 fork and exit 300 tty script instances you are not interested in, it
786 is just one rule that matches exactly the device.)
788 o udev handles now _all_ events not just events for class and block
789 devices, this way it is possible to control the complete event
790 behavior with udev rules. Especially useful for rules like:
791 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
793 o As used in the modalias rule, udev supports now textual
794 substitution placeholder along with the usual format chars. This
795 needs to be documented, for now it's only visible in udev_rules_parse.c.
797 o The rule keys support now more operations. This is documented in the
798 man page. It is possible to add values to list-keys like the SYMLINK
799 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
800 Also "final"-assignments are supported by using KEY:="value", which will
801 prevent changing the key by any later rule.
803 o kernel 2.6.12 has the "detached_state" attribute removed from
804 sysfs, which was used to recognize sysfs population. We switched that
805 to wait for the "bus" link, which is only available in kernels after 2.6.11.
806 Running this udev version on older kernels may cause a short delay for
809 o To provide infrastructure for persistent device naming, the id programs:
810 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
811 to export the probed data in environment key format:
812 pim:~ # /sbin/ata_id --export /dev/hda
813 ID_MODEL=HTS726060M9AT00
814 ID_SERIAL=MRH401M4G6UM9B
818 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
819 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
822 kay@pim:~> tree /dev/disk
825 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
826 | `-- IBM-Memory_Key -> ../../sda
828 | |-- swap -> ../../hda1
829 | |-- date -> ../../sda1
830 | `-- home -> ../../hda3
832 |-- 2E08712B0870F2E7 -> ../../hda3
833 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
834 |-- E845-7A89 -> ../../sda1
835 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
837 The IMPORT= operation will import these keys in the environment and make
838 it available for later PROGRAM= and RUN= executed programs. The keys are
839 also stored in the udevdb and can be queried from there with one of the
842 o A few binaries are silently added to the repository, which can be used
843 to replay kernel events from initramfs instead of using coldplug. udevd
844 can be instructed now to queue-up events while the stored events from
845 initramfs are filled into the udevd-queue. This code is still under
846 development and there is no documentation now besides the code itself.
847 The additional binaries get compiled, but are not installed by default.
849 o There is also a temporary fix for a performance problem where too many
850 events happen in parallel and every event needs to parse the rules.
851 udev can now read precompiled rules stored on disk. This is likely to be
852 replaced by a more elegant solution in a future udev version.
856 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
857 Fix for libsysfs not to expect this file was added.
861 All rules are applied now, but only the first matching rule with a NAME-key
862 will be applied. All later rules with NAME-key are completely ignored. This
863 way system supplied symlinks or permissions gets applied to user-defined
867 Please check your rules setup, if you may need to add OPTIONS="last_rule"
868 to some rules, to keep the old behavior.
870 The rules are read on "remove"-events too. That makes is possible to match
871 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
872 instruct udev to ignore an event (OPTIONS="ignore_device").
873 The new ACTION-key may be used to let a rule act only at a "remove"-event.
875 The new RUN-key supports rule-based execution of programs after device-node
876 handling. This is meant as a general replacement for the dev.d/-directories
877 to give fine grained control over the execution of programs.
879 The %s{}-sysfs format char replacement values are searched at any of the
880 devices in the device chain now, not only at the class-device.
882 We support log priority levels now. The value udev_log in udev.conf is used
883 to determine what is printed to syslog. This makes it possible to
884 run a version with compiled-in debug messages in a production environment
885 which is sometimes needed to find a bug.
886 It is still possible to supress the inclusion of _any_ syslog usage with
887 USE_LOG=false to create the smallest possible binaries if needed.
888 The configured udev_log value can be overridden with the environment variable
893 Possible use of a system-wide klibc:
894 make USE_KLIBC=true KLCC=/usr/bin/klcc all
895 will link against an external klibc and our own version will be ignored.
899 We support an unlimited count of symlinks now.
901 If USE_STATIC=true is passed to a glibc build, we link statically and use
902 a built-in userdb parser to resolve user and group names.
904 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
905 we walk up the chain of physical devices to find a match.
907 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
908 easy to skip certain attribute matches without composing rules with weird
909 character class negations like:
910 KERNEL="[!s][!c][!d]*"
911 this can now be replaced with:
913 The current simple '=' is still supported, and should work as it does today,
914 but existing rules should be converted if possible, to be better readable.
916 We have new ENV{}== key now, to match against a maximum of 5 environment
919 udevstart is its own binary again, because we don't need co carry this araound
920 with every forked event.
~ianmdlvl / elogind.git / blob