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 since
10 a while, if these symlinks are used, a deprecation warning to stderr
17 Optical drive's media is no longer probed for raid signatures,
18 reading the end of the device causes some devices to malfunction.
19 Also the offset of the last session found is used now to probe
22 The volume_id library got a major version number update to 1,
23 some deprecated functions are removed.
25 A shared library "libudev" gets installed now to provide access
26 to udev device information. DeviceKit, the successor of HAL, will
27 need this library to access the udev database and search sysfs for
29 The library is currently in an experimental state, also the API is
30 expected to change, as long as the DeviceKit integration is not
35 We use ./configure now. See INSTALL for details. Current
38 "/usr" - prefix for man pages, include files
40 "" - the root filesystem, prefix for libs and binaries
44 "lib" - directory name for libraries, not a path name
45 multilib 64bit systems may use "lib64" instead of "lib"
47 compile-in verbose debug messages
49 disable all logging and compile-out all log strings
51 link against SELInux libraries, to set the expected context
54 In the default rules, the group "disk" gets permissions 0660 instead
55 of 0640. One small step closer to unify distro rules. Some day, all
56 distros hopefully end up with the same set of rules.
58 No symlinks to udevadm are installed anymore, if they are still needed,
59 they should be provided by the package.
65 Default udev rules, which are not supposed to be edited by the user, should
66 be placed in /lib/udev/rules.d/ now, to make it clear that they are private to
67 the udev package and will be replaced with an update. Udev will pick up rule
69 /lib/udev/rules.d/ - default installed rules
70 /etc/udev/rules.d/ - user rules + on-the-fly generated rules
71 /dev/.udev/rules.d/ - temporary non-persistent rules created after bootup
72 It does not matter in which directory a rule file lives, all files are sorted
75 To help creating /dev/root, we have now:
76 $ udevadm info --export --export-prefix="ROOT_" --device-id-of-file=/
79 In case the current --device-id-of-file is already used, please switch to
80 the --export format version, it saves the output parsing and the old
81 format will be changed to use ':' as a separator, like the format in the
86 Fix cdrom_id to properly recognize blank media.
92 Tape drive id-data is queried from /dev/bsg/* instead of the tape
93 nodes. This avoids rewinding tapes on open().
99 The symlinks udevcontrol and udevtrigger are no longer installed by
102 The scsi_id program does not depend on sysfs anymore. It can speak
103 SGv4 now, so /dev/bsg/* device nodes can be used, to query SCSI device
104 data, which should solve some old problems with tape devices, where
105 we better do not open all tape device nodes to identify the device.
111 The cdrom_id program is replaced by an advanced version, which can
112 detect most common device types, and also properties of the inserted
113 media. This is part of moving some basic functionality from HAL into
114 udev (and the kernel).
120 The last WAIT_FOR_SYSFS rule is removed from the default rules.
122 The symlinks to udevadm for the debugging tools: udevmonitor and
123 udevtest are no longer created.
125 The symlinks to the udevadm man page for the old tool names are
128 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
129 should be prefixed with '@' to indicate that the path is not a
140 Udevstart is removed from the tree, it did not get installed for
141 a long time now, and is long replaced by trigger and settle.
147 All udev tools are merged into a single binary called udevadm.
148 The old names of the tools are built-in commands in udevadm now.
149 Symlinks to udevadm, with the names of the old tools, provide
150 the same functionality as the standalone tools. There is also
151 only a single udevadm.8 man page left for all tools.
153 Tools like mkinitramfs should be checked, if they need to include
154 udevadm in the list of files.
164 The etc/udev/rules.d/ directory now contains a default set of basic
165 udev rules. This initial version is the result of a rules file merge
166 of Fedora and openSUSE. For these both distros only a few specific
167 rules are left in their own file, named after the distro. Rules which
168 are optionally installed, because they are only valid for a specific
169 architecture, or rules for subsystems which are not always used are
170 in etc/udev/packages/.
176 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
177 actions by dynamically created rules.
179 SYMLINK=="<value>" matches agains the entries in the list of
180 currently defined symlinks. The links are not created in the
181 filesystem at that point in time, but the values can be matched.
183 RUN{ignore_error}+="<program>" will ignore any exit code from the
184 program and not record as a failed event.
190 Final merge of patches/features from the Ubuntu package.
196 Control characters in filesystem label strings are no longer silenty
197 removed, but hex-encoded, to be able to uniquely identify the device
198 by its symlink in /dev/disk/by-label/.
199 If libvolume_id is used by mount(8), LABEL= will work as expected,
200 if slashes or other characters are used in the label string.
202 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
203 can be specified now. The TEST key accepts an optional mode mask
204 TEST{0100}=="<is executable file>".
206 Scsi_id now supports a mode without expecting scsi-specific sysfs
207 entries to allow the extraction of cciss-device persistent properties.
213 In the future, we may see uuid's which are just simple character
214 strings (see the DDF Raid Specification). For that reason vol_id now
215 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
216 the creation of symlinks, the *_SAFE values ensure, that no control
217 or whitespace characters are used in the filename.
219 Possible users of libvolume_id, please use the volume_id_get_* functions.
220 The public struct will go away in a future release of the library.
226 Removal of useless extras/eventrecorder.sh.
236 The directory multiplexer for dev.d/ and hotplug.d are finally removed
237 from the udev package.
243 Symlinks can have priorities now, the priority is assigned to the device
244 and specified with OPTIONS="link_priority=100". Devices with higher
245 priorities overwrite the symlinks of devices with lower priorities.
246 If the device that currently owns the link, goes away, the symlink
247 will be removed, and recreated, pointing to the next device with the
248 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
249 more reliable, if multiple devices contain the same metadata and overwrite
252 The dasd_id program is removed from the udev tree, and dasdinfo, with the
253 needed rules, are part of the s390-tools now.
255 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
256 we may get the scsi sysfs mess fixed some day, and this will only catch
257 the devices we are looking for.
259 USB serial numbers for storage devices have the target:lun now appended,
260 to make it possibble to distinguish broken multi-lun devices with all
261 the same SCSI identifiers.
263 Note: The extra "run_directory" which searches and executes stuff in
264 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
265 with the next release. Make sure, that you don't use it anymore, or
266 provides your own implementation of that inefficient stuff.
267 We are tired of reports about a "slow udev", because these directories
268 contain stuff, that runs with _every_ event, instead of using rules,
269 that run programs only for the matching events.
279 DRIVER== will match only for devices that actually have a real
280 driver. DRIVERS== must be used, if parent devices should be
281 included in the match.
283 Libvolume_id's "linux_raid" detection needed another fix.
291 Add additional check to volume_id detection of via_raid, cause
292 some company decided to put a matching pattern all over the empty
293 storage area of their music players.
297 Fix path_id for SAS devices.
301 The udev daemon can be started with --debug-trace now, which will
302 execute all events serialized to get a chance to catch a possible
303 action that crashes the box.
305 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
306 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
307 are excluded from the warning. Referencing parent attributes directly
308 may break when something in the kernel driver model changes. Udev will
309 just find the attribute by walking up the parent chain.
311 Udevtrigger now sorts the list of devices depending on the device
312 dependency, so a "usb" device is triggered after the parent "pci"
317 Revert persistent-storage ata-serial '_' '-' replacement.
323 Udevtrigger can now filter the list of devices to be triggered. Matches
324 for subsystems or sysfs attributes can be specified.
326 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
327 zero-sized files to avoid pointing to /sys and confuse broken tools which
328 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
331 The rules and scripts to create udev rules for persistent network
332 devices and optical drives are in the extras/rules_generator directory
333 now. If you use something similar, please consider replacing your own
334 version with this, to share the support effort. The rule_generator
335 installs its own rules into /etc/udev/rules.d.
337 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
338 the rule_generator depends on cdrom_id to be called in an earlier rule.
344 Renaming of some key names (the old names still work):
345 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
346 (The behavior of the key DRIVER will change soon in one of the next
347 releases, to match only the event device, please switch to DRIVERS
348 instead. If DRIVER is used, it will behave like DRIVERS, but an error
350 With the new key names, we have a more consistent and simpler scheme.
351 We can match the properties of the event device only, with: KERNEL,
352 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
353 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
354 longer mentioned in the man page and should be switched in the rule
357 ATTR{file}="value" can be used now, to write to a sysfs file of the
358 event device. Instead of:
359 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
361 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
363 All the PHYSDEV* keys are deprecated and will be removed from a
365 PHYDEVPATH - is the path of a parent device and should not be
367 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
368 matched with SUBSYSTEMS==
369 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
370 Newer kernels will have DRIVER in the environment,
371 for older kernels udev puts in. Class device will
372 no longer carry this property of a parent and
373 DRIVERS== can be used to match such a parent value.
374 Note that ENV{DRIVER} is only available for a few bus devices, where
375 the driver is already bound at device event time. On coldplug, the
376 events for a lot devices are already bound to a driver, and they will have
377 that value set. But on hotplug, at the time the kernel creates the device,
378 it can't know what driver may claim the device after that, therefore
379 in most cases it will be empty.
381 Failed events should now be re-triggered with:
382 udevtrigger --retry-failed.
383 Please switch to this command, so we keep the details of the /dev/.udev/failed/
384 files private to the udev tools. We may need to switch the current symlink
385 target, cause some obviously broken tools try to scan all files in /dev
386 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
387 million times. This takes ages on slow boxes.
389 The udevinfo attribute walk (-a) now works with giving a device node
390 name (-n) instead of a devpath (-p). The query now always works, also when
391 no database file was created by udev.
393 The built-in /etc/passwd /etc/group parser is removed, we always depend on
394 getpwnam() and getgrnam() now. One of the next releases will depend on
395 fnmatch() and may use getopt_long().
399 Bugfixes and small improvements.
403 Fix path_id for recent kernels.
409 Added support for swapping network interface names, by temporarily
410 renaming the device and wait for the target name to become free.
414 The built-in MODALIAS key and substitution is removed.
418 The binary firmware helper is replaced by the usual simple
419 shell script. Udevsend is removed from the tree.
427 Some more keys require the correct use of '==' and '=' depending
428 on the kind of operation beeing an assignment or a match. Rules
429 with invalid operations are skipped and logged to syslog. Please
430 test with udevtest if the parsing of your rules throws errors and
431 fix possibly broken rules.
435 Provide "udevsettle" to wait for all current udev events to finish.
436 It also watches the current kernel netlink queue by comparing the
437 even sequence number to make sure that there are no current pending
438 events that have not already arrived in the daemon.
442 Fix rule to skip persistent rules for removable IDE devices, which
443 also skipped optical IDE drives.
445 All *_id program are installed in /lib/udev/ by default now.
447 No binary is stripped anymore as this should be done in the
448 packaging process and not at build time.
450 libvolume_id is provided as a shared library now and vol_id is
451 linked against it. Also one of the next HAL versions will require
452 this library, and the HAL build process will also require the
453 header file to be installed. The copy of the same code in HAL will
454 be removed to have only a single copy left on the system.
458 Add persistent links for SCSI tapes. The rules file is renamed
459 to 60-persistent-storage.rules.
461 Create persistent path for usb devices. Can be used for all sorts
462 of devices that can't be distinguished by other properties like
463 multiple identical keyboards and mice connected to the same box.
465 Provide "udevtrigger" program to request events on coldplug. The
466 shell script is much too slow with thousends of devices.
470 Fix persistent disk rules to exclude removable IDE drives.
472 Warn if %e, $modalias or MODALIAS is used.
476 Fix queue export, which wasn't correct for subsequent add/remove
477 events for the same device.
481 Fix cramfs detection on big endian.
483 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
488 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
489 attributes were only checked at the parent device that matched the
490 by BUS requested subsystem. Fix it to also look at the device we
491 received the event for.
493 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
498 Fix a bug where NAME="" would prevent RUN from beeing executed.
500 RUN="/bin/program" does not longer automatically add the subsystem
501 as the first parameter. This is from the days of /sbin/hotplug
502 which is dead now and it's just confusing to need to add a space at
503 the end of the program name to prevent this.
504 If you use rules that need the subsystem as the first parameter,
505 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
506 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
510 The udev man page has moved to udev(7) as it does not describe a command
511 anymore. The programs udev, udevstart and udevsend are no longer installed
512 by default and must be copied manually, if they should be installed or
513 included in a package.
515 Fix a bug where "ignore_device" could run earlier collected RUN keys before
516 the ignore rule was applied.
518 More preparation for future sysfs changes. usb_id and scsi_id no longer
519 depend on a magic order of devices in the /devices chain. Specific devices
520 should be requested by their subsytem.
522 This will always find the scsi parent device without depending on a specific
524 dev = sysfs_device_get(devpath);
525 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
527 The "device" link in the current sysfs layout will be automatically
528 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
529 parent in the devpath. If a device is requested by it's symlink, like all
530 class devices in the new sysfs layout will look like, it gets automatically
531 resolved and substituted with the real devpath and not the symlink path.
534 A similar logic must be applied to _all_ sysfs users, including
535 scripts, that search along parent devices in sysfs. The explicit use of
536 the "device" link must be avoided. With the future sysfs layout all
537 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
538 back to the "class" or the "bus". The layout of the parent devices in
539 /devices is not necessarily expected to be stable across kernel releases and
540 searching for parents by their subsystem should make sysfs users tolerant
541 for changed parent chains.
545 Prepare udev to work with the experimental kernel patch, that moves
546 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
548 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
549 moving the class devices to /sys/devices.
551 Thanks again to Marco for help finding a hopefully nice compromise
552 to make %b simpler and working again.
556 Complete removal of libsysfs, replaced by simple helper functions
557 which are much simpler and a bit faster. The udev daemon operatesentirely
558 on event parameters and does not use sysfs for simple rules anymore.
559 Please report any new bugs/problems, that may be caused by this big
560 change. They will be fixed immediately.
562 The enumeration format character '%e' is deprecated and will be
563 removed sometimes from a future udev version. It never worked correctly
564 outside of udevstart, so we can't use it with the new parallel
565 coldplug. A simple enumeration is as useless as the devfs naming
566 scheme, just get rid of both if you still use it.
568 MODALIAS and $modalias is not needed and will be removed from one of
569 the next udev versions, replace it in all rules with ENV{MODALIAS} or
570 the sysfs "modalias" value.
572 Thanks a lot to Marco for all his help on finding and fixing bugs.
576 Let scsi_id request libata drive serial numbers from page 0x80.
578 Renamed etc/udev/persistent.rules to persistent-disk.rules and
579 added /dev/disk/by-name/* for device mapper device names.
581 Removed %e from the man page. It never worked reliably outside
582 of udevstart and udevstart is no longer recommended to use.
586 Symlinks are now exported to the event environment. Hopefully it's no
587 longer needed to run udevinfo from an event process, like it was
588 mentioned on the hotplug list:
589 UDEV [1134776873.702967] add@/block/sdb
592 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
596 Fix a problem if udevsend is used as the hotplug handler and tries to use
597 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
598 and this kind of problems will hopefully go away soon.
602 All built-in logic to work around bad sysfs timing is removed with this
603 version. The need to wait for sysfs files is almost fixed with a kernel
604 version that doesn't work with this udev version anyway. Until we fix
605 the timing of the "bus" link creation, the former integrated logic should
606 be emulated by a rule placed before all other rules:
607 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
609 The option "udev_db" does no longer exist. All udev state will be in
610 /$udev_root/.udev/ now, there is no longer an option to set this
612 If the init script or something else used this value, just depend on
613 this hardcoded path. But remember _all_content_ of this directory is
614 still private to udev and can change at any time.
616 Default location for rule sripts and helper programs is now: /lib/udev/.
617 Everything that is not useful on the commandline should go into this
618 directory. Some of the helpers in the extras folder are installed there
619 now. The rules need to be changed, to find the helpers there.
621 Also /lib/udev/devices is recommended as a directory where packages or
622 the user can place real device nodes, which get copied over to /dev at
623 every boot. This should replace the various solutions with custom config
626 Udevsend does no longer start the udev daemon. This must be done with
627 the init script that prepares /dev on tmpfs and creates the initial nodes,
628 before starting the daemon.
632 Silent a too verbose error logging for the old hotplug.d/ dev.d/
635 The copy of klibc is removed. A systemwide installed version of klibc
636 should be used to build a klibc udev now.
640 NAME="" will not create any nodes, but execute RUN keys. To completely
641 ignore an event the OPTION "ignore_device" should be used.
643 After removal of the reorder queue, events with a TIMEOUT can be executed
644 without any queuing now.
648 Fixed bug in udevd, if inotify is not available. We depend on netlink
649 uevents now, kernels without that event source will not work with that
650 version of udev anymore.
654 The rule parsing happens now in the daemon once at startup, all udev
655 event processes inherit the already parsed rules from the daemon.
656 It is shipped with SUSE10.0 and reduces heavily the system load at
657 startup. The option to save precompiled rules and let the udev process
658 pick the them up is removed, as it's no longer needed.
660 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
661 device. Libsysfs is changed to "translate" the requested link into the
662 real device path, as it would happen with the hotplug event. Otherwise
663 device removal and the udev database will not work.
665 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
668 A few improvements for vol_id, the filesytem probing code.
672 Fix a stupid typo in extras/run_directory for "make install".
674 scsi_id creates the temporary devnode now in /dev for usage with a
675 non-writable /tmp directory.
677 The uevent kernel socket buffer can carry app. 50.000 events now,
678 let's see who can break this again. :)
680 The upcoming kernel will have a new input driver core integration.
681 Some class devices are now symlinks to the real device. libsysfs
682 needs a fix for this to work correctly. Udevstart of older udev
683 versions will _not_ create these devices!
687 Fix a 'install' target in the Makefile, that prevents EXTRAS from
692 A bunch of mostly trivial bugfixes. From now on no node name or
693 symlink name can contain any character than plain whitelisted ascii
694 characters or validated utf8 byte-streams. This is needed for the
695 /dev/disk/by-label/* links, because we import untrusted data and
696 export it to the filesystem.
700 More bugfixes. If udevd was started from the kernel, we don't
701 have stdin/stdout/stderr, which broke the forked tools in some
706 Bugfix. udevstart event ordering was broken for a long time.
707 The new run_program() uncovered it, because /dev/null was not
708 available while we try to run external programs.
709 Now udevstart should create it before we run anything.
713 Minor bugfixes and some distro rules updates. If you don't have the
714 persistent disk rules in /dev/disk/by-*/* on your distro, just
715 grab it from here. :)
719 We can use socket communication now to pass events from udev to
721 RUN+="socket:/org/freedesktop/hal/udev_event"
722 will pass the whole udev event to the HAL daemon without the need
723 for a forked helper. (See ChangeLog for udevmonitor, as an example)
727 Mostly bugfixes and see ChangeLog.
729 The test for the existence of an environment value should be
731 ENV{KEY}=="*" to ENV{KEY}=="?*"
732 because "*" will not fail anymore, if the key does not exist or
737 Bugfixes and a few tweaks described in the ChangeLog.
741 Mostly a Bugfix release.
743 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
744 timing with custom rules.
748 We changed the internal rule storage format. Our large rule files took
749 2 MB of RAM, with the change we are down to 99kB.
751 If the device-node has been created with default name and no symlink or
752 options are to remenber, it is not longer stored in the udevdb. HAL will
753 need to be updated to work correctly with that change.
755 To overrride optimization flags, OPTFLAGS may be used now.
763 Major changes happened with this release. The goal is to take over the
764 complete kernel-event handling and provide a more efficient way to dispatch
765 kernel events. Replacing most of the current shell script logic and the
766 kernel forked helper with a netlink-daemon and a rule-based event handling.
768 o udevd listens to netlink events now. The first valid netlink event
769 will make udevd ignore any message from udevsend that contains a
770 SEQNUM, to avoid duplicate events. The forked events can be disabled
772 echo "" > /proc/sys/kernel/hotplug
773 For full support, the broken input-subsytem needs to be fixed, not to
774 bypass the driver core.
776 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
777 removed from udev itself and must be emulated by calling small
778 helper binaries provided in the extras folder:
779 make EXTRAS=extras/run_directory/
780 will build udev_run_devd and udev_run_hotplugd, which can be called
781 from a rule if needed:
782 RUN+="/sbin/udev_run_hotplugd"
783 The recommended way to handle this is to convert all the calls from
784 the directories to explicit udev rules and get completely rid of the
785 multiplexing. (To catch a ttyUSB event, you now no longer need to
786 fork and exit 300 tty script instances you are not interested in, it
787 is just one rule that matches exactly the device.)
789 o udev handles now _all_ events not just events for class and block
790 devices, this way it is possible to control the complete event
791 behavior with udev rules. Especially useful for rules like:
792 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
794 o As used in the modalias rule, udev supports now textual
795 substitution placeholder along with the usual format chars. This
796 needs to be documented, for now it's only visible in udev_rules_parse.c.
798 o The rule keys support now more operations. This is documented in the
799 man page. It is possible to add values to list-keys like the SYMLINK
800 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
801 Also "final"-assignments are supported by using KEY:="value", which will
802 prevent changing the key by any later rule.
804 o kernel 2.6.12 has the "detached_state" attribute removed from
805 sysfs, which was used to recognize sysfs population. We switched that
806 to wait for the "bus" link, which is only available in kernels after 2.6.11.
807 Running this udev version on older kernels may cause a short delay for
810 o To provide infrastructure for persistent device naming, the id programs:
811 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
812 to export the probed data in environment key format:
813 pim:~ # /sbin/ata_id --export /dev/hda
814 ID_MODEL=HTS726060M9AT00
815 ID_SERIAL=MRH401M4G6UM9B
819 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
820 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
823 kay@pim:~> tree /dev/disk
826 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
827 | `-- IBM-Memory_Key -> ../../sda
829 | |-- swap -> ../../hda1
830 | |-- date -> ../../sda1
831 | `-- home -> ../../hda3
833 |-- 2E08712B0870F2E7 -> ../../hda3
834 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
835 |-- E845-7A89 -> ../../sda1
836 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
838 The IMPORT= operation will import these keys in the environment and make
839 it available for later PROGRAM= and RUN= executed programs. The keys are
840 also stored in the udevdb and can be queried from there with one of the
843 o A few binaries are silently added to the repository, which can be used
844 to replay kernel events from initramfs instead of using coldplug. udevd
845 can be instructed now to queue-up events while the stored events from
846 initramfs are filled into the udevd-queue. This code is still under
847 development and there is no documentation now besides the code itself.
848 The additional binaries get compiled, but are not installed by default.
850 o There is also a temporary fix for a performance problem where too many
851 events happen in parallel and every event needs to parse the rules.
852 udev can now read precompiled rules stored on disk. This is likely to be
853 replaced by a more elegant solution in a future udev version.
857 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
858 Fix for libsysfs not to expect this file was added.
862 All rules are applied now, but only the first matching rule with a NAME-key
863 will be applied. All later rules with NAME-key are completely ignored. This
864 way system supplied symlinks or permissions gets applied to user-defined
868 Please check your rules setup, if you may need to add OPTIONS="last_rule"
869 to some rules, to keep the old behavior.
871 The rules are read on "remove"-events too. That makes is possible to match
872 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
873 instruct udev to ignore an event (OPTIONS="ignore_device").
874 The new ACTION-key may be used to let a rule act only at a "remove"-event.
876 The new RUN-key supports rule-based execution of programs after device-node
877 handling. This is meant as a general replacement for the dev.d/-directories
878 to give fine grained control over the execution of programs.
880 The %s{}-sysfs format char replacement values are searched at any of the
881 devices in the device chain now, not only at the class-device.
883 We support log priority levels now. The value udev_log in udev.conf is used
884 to determine what is printed to syslog. This makes it possible to
885 run a version with compiled-in debug messages in a production environment
886 which is sometimes needed to find a bug.
887 It is still possible to supress the inclusion of _any_ syslog usage with
888 USE_LOG=false to create the smallest possible binaries if needed.
889 The configured udev_log value can be overridden with the environment variable
894 Possible use of a system-wide klibc:
895 make USE_KLIBC=true KLCC=/usr/bin/klcc all
896 will link against an external klibc and our own version will be ignored.
900 We support an unlimited count of symlinks now.
902 If USE_STATIC=true is passed to a glibc build, we link statically and use
903 a built-in userdb parser to resolve user and group names.
905 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
906 we walk up the chain of physical devices to find a match.
908 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
909 easy to skip certain attribute matches without composing rules with weird
910 character class negations like:
911 KERNEL="[!s][!c][!d]*"
912 this can now be replaced with:
914 The current simple '=' is still supported, and should work as it does today,
915 but existing rules should be converted if possible, to be better readable.
917 We have new ENV{}== key now, to match against a maximum of 5 environment
920 udevstart is its own binary again, because we don't need co carry this araound
921 with every forked event.
~ianmdlvl / elogind.git / blob