3 More libudev work. Most of udevadm's functionality comes from libudev
6 udevadm trigger has a new option --type, which allows to trigger events
7 for "devices", for "subsystems" and "failed" devices. The old option
8 --retry-failed" still works, but is no longer mentioned in the man page.
14 The udevadm info --device-id-of-file= output has changed to use
15 the obvious format. Possible current users should use the --export
16 option which is not affected.
18 The old udev commands symlinks to udevadm are not installed, if
19 these symlinks are used, a warning is printed.
25 Optical drive's media is no longer probed for raid signatures,
26 reading the end of the device causes some devices to malfunction.
27 Also the offset of the last session found is used now to probe
30 The volume_id library got a major version number update to 1,
31 some deprecated functions are removed.
33 A shared library "libudev" gets installed now to provide access
34 to udev device information. DeviceKit, the successor of HAL, will
35 need this library to access the udev database and search sysfs for
37 The library is currently in an experimental state, also the API is
38 expected to change, as long as the DeviceKit integration is not
43 We use ./configure now. See INSTALL for details. Current
46 "/usr" - prefix for man pages, include files
48 "" - the root filesystem, prefix for libs and binaries
52 "lib" - directory name for libraries, not a path name
53 multilib 64bit systems may use "lib64" instead of "lib"
55 compile-in verbose debug messages
57 disable all logging and compile-out all log strings
59 link against SELInux libraries, to set the expected context
62 In the default rules, the group "disk" gets permissions 0660 instead
63 of 0640. One small step closer to unify distro rules. Some day, all
64 distros hopefully end up with the same set of rules.
66 No symlinks to udevadm are installed anymore, if they are still needed,
67 they should be provided by the package.
73 Default udev rules, which are not supposed to be edited by the user, should
74 be placed in /lib/udev/rules.d/ now, to make it clear that they are private to
75 the udev package and will be replaced with an update. Udev will pick up rule
77 /lib/udev/rules.d/ - default installed rules
78 /etc/udev/rules.d/ - user rules + on-the-fly generated rules
79 /dev/.udev/rules.d/ - temporary non-persistent rules created after bootup
80 It does not matter in which directory a rule file lives, all files are sorted
83 To help creating /dev/root, we have now:
84 $ udevadm info --export --export-prefix="ROOT_" --device-id-of-file=/
87 In case the current --device-id-of-file is already used, please switch to
88 the --export format version, it saves the output parsing and the old
89 format will be changed to use ':' as a separator, like the format in the
94 Fix cdrom_id to properly recognize blank media.
100 Tape drive id-data is queried from /dev/bsg/* instead of the tape
101 nodes. This avoids rewinding tapes on open().
107 The symlinks udevcontrol and udevtrigger are no longer installed by
110 The scsi_id program does not depend on sysfs anymore. It can speak
111 SGv4 now, so /dev/bsg/* device nodes can be used, to query SCSI device
112 data, which should solve some old problems with tape devices, where
113 we better do not open all tape device nodes to identify the device.
119 The cdrom_id program is replaced by an advanced version, which can
120 detect most common device types, and also properties of the inserted
121 media. This is part of moving some basic functionality from HAL into
122 udev (and the kernel).
128 The last WAIT_FOR_SYSFS rule is removed from the default rules.
130 The symlinks to udevadm for the debugging tools: udevmonitor and
131 udevtest are no longer created.
133 The symlinks to the udevadm man page for the old tool names are
136 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
137 should be prefixed with '@' to indicate that the path is not a
148 Udevstart is removed from the tree, it did not get installed for
149 a long time now, and is long replaced by trigger and settle.
155 All udev tools are merged into a single binary called udevadm.
156 The old names of the tools are built-in commands in udevadm now.
157 Symlinks to udevadm, with the names of the old tools, provide
158 the same functionality as the standalone tools. There is also
159 only a single udevadm.8 man page left for all tools.
161 Tools like mkinitramfs should be checked, if they need to include
162 udevadm in the list of files.
172 The etc/udev/rules.d/ directory now contains a default set of basic
173 udev rules. This initial version is the result of a rules file merge
174 of Fedora and openSUSE. For these both distros only a few specific
175 rules are left in their own file, named after the distro. Rules which
176 are optionally installed, because they are only valid for a specific
177 architecture, or rules for subsystems which are not always used are
178 in etc/udev/packages/.
184 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
185 actions by dynamically created rules.
187 SYMLINK=="<value>" matches agains the entries in the list of
188 currently defined symlinks. The links are not created in the
189 filesystem at that point in time, but the values can be matched.
191 RUN{ignore_error}+="<program>" will ignore any exit code from the
192 program and not record as a failed event.
198 Final merge of patches/features from the Ubuntu package.
204 Control characters in filesystem label strings are no longer silenty
205 removed, but hex-encoded, to be able to uniquely identify the device
206 by its symlink in /dev/disk/by-label/.
207 If libvolume_id is used by mount(8), LABEL= will work as expected,
208 if slashes or other characters are used in the label string.
210 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
211 can be specified now. The TEST key accepts an optional mode mask
212 TEST{0100}=="<is executable file>".
214 Scsi_id now supports a mode without expecting scsi-specific sysfs
215 entries to allow the extraction of cciss-device persistent properties.
221 In the future, we may see uuid's which are just simple character
222 strings (see the DDF Raid Specification). For that reason vol_id now
223 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
224 the creation of symlinks, the *_SAFE values ensure, that no control
225 or whitespace characters are used in the filename.
227 Possible users of libvolume_id, please use the volume_id_get_* functions.
228 The public struct will go away in a future release of the library.
234 Removal of useless extras/eventrecorder.sh.
244 The directory multiplexer for dev.d/ and hotplug.d are finally removed
245 from the udev package.
251 Symlinks can have priorities now, the priority is assigned to the device
252 and specified with OPTIONS="link_priority=100". Devices with higher
253 priorities overwrite the symlinks of devices with lower priorities.
254 If the device that currently owns the link, goes away, the symlink
255 will be removed, and recreated, pointing to the next device with the
256 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
257 more reliable, if multiple devices contain the same metadata and overwrite
260 The dasd_id program is removed from the udev tree, and dasdinfo, with the
261 needed rules, are part of the s390-tools now.
263 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
264 we may get the scsi sysfs mess fixed some day, and this will only catch
265 the devices we are looking for.
267 USB serial numbers for storage devices have the target:lun now appended,
268 to make it possibble to distinguish broken multi-lun devices with all
269 the same SCSI identifiers.
271 Note: The extra "run_directory" which searches and executes stuff in
272 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
273 with the next release. Make sure, that you don't use it anymore, or
274 provides your own implementation of that inefficient stuff.
275 We are tired of reports about a "slow udev", because these directories
276 contain stuff, that runs with _every_ event, instead of using rules,
277 that run programs only for the matching events.
287 DRIVER== will match only for devices that actually have a real
288 driver. DRIVERS== must be used, if parent devices should be
289 included in the match.
291 Libvolume_id's "linux_raid" detection needed another fix.
299 Add additional check to volume_id detection of via_raid, cause
300 some company decided to put a matching pattern all over the empty
301 storage area of their music players.
305 Fix path_id for SAS devices.
309 The udev daemon can be started with --debug-trace now, which will
310 execute all events serialized to get a chance to catch a possible
311 action that crashes the box.
313 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
314 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
315 are excluded from the warning. Referencing parent attributes directly
316 may break when something in the kernel driver model changes. Udev will
317 just find the attribute by walking up the parent chain.
319 Udevtrigger now sorts the list of devices depending on the device
320 dependency, so a "usb" device is triggered after the parent "pci"
325 Revert persistent-storage ata-serial '_' '-' replacement.
331 Udevtrigger can now filter the list of devices to be triggered. Matches
332 for subsystems or sysfs attributes can be specified.
334 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
335 zero-sized files to avoid pointing to /sys and confuse broken tools which
336 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
339 The rules and scripts to create udev rules for persistent network
340 devices and optical drives are in the extras/rules_generator directory
341 now. If you use something similar, please consider replacing your own
342 version with this, to share the support effort. The rule_generator
343 installs its own rules into /etc/udev/rules.d.
345 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
346 the rule_generator depends on cdrom_id to be called in an earlier rule.
352 Renaming of some key names (the old names still work):
353 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
354 (The behavior of the key DRIVER will change soon in one of the next
355 releases, to match only the event device, please switch to DRIVERS
356 instead. If DRIVER is used, it will behave like DRIVERS, but an error
358 With the new key names, we have a more consistent and simpler scheme.
359 We can match the properties of the event device only, with: KERNEL,
360 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
361 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
362 longer mentioned in the man page and should be switched in the rule
365 ATTR{file}="value" can be used now, to write to a sysfs file of the
366 event device. Instead of:
367 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
369 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
371 All the PHYSDEV* keys are deprecated and will be removed from a
373 PHYDEVPATH - is the path of a parent device and should not be
375 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
376 matched with SUBSYSTEMS==
377 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
378 Newer kernels will have DRIVER in the environment,
379 for older kernels udev puts in. Class device will
380 no longer carry this property of a parent and
381 DRIVERS== can be used to match such a parent value.
382 Note that ENV{DRIVER} is only available for a few bus devices, where
383 the driver is already bound at device event time. On coldplug, the
384 events for a lot devices are already bound to a driver, and they will have
385 that value set. But on hotplug, at the time the kernel creates the device,
386 it can't know what driver may claim the device after that, therefore
387 in most cases it will be empty.
389 Failed events should now be re-triggered with:
390 udevtrigger --retry-failed.
391 Please switch to this command, so we keep the details of the /dev/.udev/failed/
392 files private to the udev tools. We may need to switch the current symlink
393 target, cause some obviously broken tools try to scan all files in /dev
394 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
395 million times. This takes ages on slow boxes.
397 The udevinfo attribute walk (-a) now works with giving a device node
398 name (-n) instead of a devpath (-p). The query now always works, also when
399 no database file was created by udev.
401 The built-in /etc/passwd /etc/group parser is removed, we always depend on
402 getpwnam() and getgrnam() now. One of the next releases will depend on
403 fnmatch() and may use getopt_long().
407 Bugfixes and small improvements.
411 Fix path_id for recent kernels.
417 Added support for swapping network interface names, by temporarily
418 renaming the device and wait for the target name to become free.
422 The built-in MODALIAS key and substitution is removed.
426 The binary firmware helper is replaced by the usual simple
427 shell script. Udevsend is removed from the tree.
435 Some more keys require the correct use of '==' and '=' depending
436 on the kind of operation beeing an assignment or a match. Rules
437 with invalid operations are skipped and logged to syslog. Please
438 test with udevtest if the parsing of your rules throws errors and
439 fix possibly broken rules.
443 Provide "udevsettle" to wait for all current udev events to finish.
444 It also watches the current kernel netlink queue by comparing the
445 even sequence number to make sure that there are no current pending
446 events that have not already arrived in the daemon.
450 Fix rule to skip persistent rules for removable IDE devices, which
451 also skipped optical IDE drives.
453 All *_id program are installed in /lib/udev/ by default now.
455 No binary is stripped anymore as this should be done in the
456 packaging process and not at build time.
458 libvolume_id is provided as a shared library now and vol_id is
459 linked against it. Also one of the next HAL versions will require
460 this library, and the HAL build process will also require the
461 header file to be installed. The copy of the same code in HAL will
462 be removed to have only a single copy left on the system.
466 Add persistent links for SCSI tapes. The rules file is renamed
467 to 60-persistent-storage.rules.
469 Create persistent path for usb devices. Can be used for all sorts
470 of devices that can't be distinguished by other properties like
471 multiple identical keyboards and mice connected to the same box.
473 Provide "udevtrigger" program to request events on coldplug. The
474 shell script is much too slow with thousends of devices.
478 Fix persistent disk rules to exclude removable IDE drives.
480 Warn if %e, $modalias or MODALIAS is used.
484 Fix queue export, which wasn't correct for subsequent add/remove
485 events for the same device.
489 Fix cramfs detection on big endian.
491 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
496 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
497 attributes were only checked at the parent device that matched the
498 by BUS requested subsystem. Fix it to also look at the device we
499 received the event for.
501 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
506 Fix a bug where NAME="" would prevent RUN from beeing executed.
508 RUN="/bin/program" does not longer automatically add the subsystem
509 as the first parameter. This is from the days of /sbin/hotplug
510 which is dead now and it's just confusing to need to add a space at
511 the end of the program name to prevent this.
512 If you use rules that need the subsystem as the first parameter,
513 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
514 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
518 The udev man page has moved to udev(7) as it does not describe a command
519 anymore. The programs udev, udevstart and udevsend are no longer installed
520 by default and must be copied manually, if they should be installed or
521 included in a package.
523 Fix a bug where "ignore_device" could run earlier collected RUN keys before
524 the ignore rule was applied.
526 More preparation for future sysfs changes. usb_id and scsi_id no longer
527 depend on a magic order of devices in the /devices chain. Specific devices
528 should be requested by their subsytem.
530 This will always find the scsi parent device without depending on a specific
532 dev = sysfs_device_get(devpath);
533 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
535 The "device" link in the current sysfs layout will be automatically
536 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
537 parent in the devpath. If a device is requested by it's symlink, like all
538 class devices in the new sysfs layout will look like, it gets automatically
539 resolved and substituted with the real devpath and not the symlink path.
542 A similar logic must be applied to _all_ sysfs users, including
543 scripts, that search along parent devices in sysfs. The explicit use of
544 the "device" link must be avoided. With the future sysfs layout all
545 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
546 back to the "class" or the "bus". The layout of the parent devices in
547 /devices is not necessarily expected to be stable across kernel releases and
548 searching for parents by their subsystem should make sysfs users tolerant
549 for changed parent chains.
553 Prepare udev to work with the experimental kernel patch, that moves
554 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
556 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
557 moving the class devices to /sys/devices.
559 Thanks again to Marco for help finding a hopefully nice compromise
560 to make %b simpler and working again.
564 Complete removal of libsysfs, replaced by simple helper functions
565 which are much simpler and a bit faster. The udev daemon operatesentirely
566 on event parameters and does not use sysfs for simple rules anymore.
567 Please report any new bugs/problems, that may be caused by this big
568 change. They will be fixed immediately.
570 The enumeration format character '%e' is deprecated and will be
571 removed sometimes from a future udev version. It never worked correctly
572 outside of udevstart, so we can't use it with the new parallel
573 coldplug. A simple enumeration is as useless as the devfs naming
574 scheme, just get rid of both if you still use it.
576 MODALIAS and $modalias is not needed and will be removed from one of
577 the next udev versions, replace it in all rules with ENV{MODALIAS} or
578 the sysfs "modalias" value.
580 Thanks a lot to Marco for all his help on finding and fixing bugs.
584 Let scsi_id request libata drive serial numbers from page 0x80.
586 Renamed etc/udev/persistent.rules to persistent-disk.rules and
587 added /dev/disk/by-name/* for device mapper device names.
589 Removed %e from the man page. It never worked reliably outside
590 of udevstart and udevstart is no longer recommended to use.
594 Symlinks are now exported to the event environment. Hopefully it's no
595 longer needed to run udevinfo from an event process, like it was
596 mentioned on the hotplug list:
597 UDEV [1134776873.702967] add@/block/sdb
600 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
604 Fix a problem if udevsend is used as the hotplug handler and tries to use
605 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
606 and this kind of problems will hopefully go away soon.
610 All built-in logic to work around bad sysfs timing is removed with this
611 version. The need to wait for sysfs files is almost fixed with a kernel
612 version that doesn't work with this udev version anyway. Until we fix
613 the timing of the "bus" link creation, the former integrated logic should
614 be emulated by a rule placed before all other rules:
615 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
617 The option "udev_db" does no longer exist. All udev state will be in
618 /$udev_root/.udev/ now, there is no longer an option to set this
620 If the init script or something else used this value, just depend on
621 this hardcoded path. But remember _all_content_ of this directory is
622 still private to udev and can change at any time.
624 Default location for rule sripts and helper programs is now: /lib/udev/.
625 Everything that is not useful on the commandline should go into this
626 directory. Some of the helpers in the extras folder are installed there
627 now. The rules need to be changed, to find the helpers there.
629 Also /lib/udev/devices is recommended as a directory where packages or
630 the user can place real device nodes, which get copied over to /dev at
631 every boot. This should replace the various solutions with custom config
634 Udevsend does no longer start the udev daemon. This must be done with
635 the init script that prepares /dev on tmpfs and creates the initial nodes,
636 before starting the daemon.
640 Silent a too verbose error logging for the old hotplug.d/ dev.d/
643 The copy of klibc is removed. A systemwide installed version of klibc
644 should be used to build a klibc udev now.
648 NAME="" will not create any nodes, but execute RUN keys. To completely
649 ignore an event the OPTION "ignore_device" should be used.
651 After removal of the reorder queue, events with a TIMEOUT can be executed
652 without any queuing now.
656 Fixed bug in udevd, if inotify is not available. We depend on netlink
657 uevents now, kernels without that event source will not work with that
658 version of udev anymore.
662 The rule parsing happens now in the daemon once at startup, all udev
663 event processes inherit the already parsed rules from the daemon.
664 It is shipped with SUSE10.0 and reduces heavily the system load at
665 startup. The option to save precompiled rules and let the udev process
666 pick the them up is removed, as it's no longer needed.
668 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
669 device. Libsysfs is changed to "translate" the requested link into the
670 real device path, as it would happen with the hotplug event. Otherwise
671 device removal and the udev database will not work.
673 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
676 A few improvements for vol_id, the filesytem probing code.
680 Fix a stupid typo in extras/run_directory for "make install".
682 scsi_id creates the temporary devnode now in /dev for usage with a
683 non-writable /tmp directory.
685 The uevent kernel socket buffer can carry app. 50.000 events now,
686 let's see who can break this again. :)
688 The upcoming kernel will have a new input driver core integration.
689 Some class devices are now symlinks to the real device. libsysfs
690 needs a fix for this to work correctly. Udevstart of older udev
691 versions will _not_ create these devices!
695 Fix a 'install' target in the Makefile, that prevents EXTRAS from
700 A bunch of mostly trivial bugfixes. From now on no node name or
701 symlink name can contain any character than plain whitelisted ascii
702 characters or validated utf8 byte-streams. This is needed for the
703 /dev/disk/by-label/* links, because we import untrusted data and
704 export it to the filesystem.
708 More bugfixes. If udevd was started from the kernel, we don't
709 have stdin/stdout/stderr, which broke the forked tools in some
714 Bugfix. udevstart event ordering was broken for a long time.
715 The new run_program() uncovered it, because /dev/null was not
716 available while we try to run external programs.
717 Now udevstart should create it before we run anything.
721 Minor bugfixes and some distro rules updates. If you don't have the
722 persistent disk rules in /dev/disk/by-*/* on your distro, just
723 grab it from here. :)
727 We can use socket communication now to pass events from udev to
729 RUN+="socket:/org/freedesktop/hal/udev_event"
730 will pass the whole udev event to the HAL daemon without the need
731 for a forked helper. (See ChangeLog for udevmonitor, as an example)
735 Mostly bugfixes and see ChangeLog.
737 The test for the existence of an environment value should be
739 ENV{KEY}=="*" to ENV{KEY}=="?*"
740 because "*" will not fail anymore, if the key does not exist or
745 Bugfixes and a few tweaks described in the ChangeLog.
749 Mostly a Bugfix release.
751 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
752 timing with custom rules.
756 We changed the internal rule storage format. Our large rule files took
757 2 MB of RAM, with the change we are down to 99kB.
759 If the device-node has been created with default name and no symlink or
760 options are to remenber, it is not longer stored in the udevdb. HAL will
761 need to be updated to work correctly with that change.
763 To overrride optimization flags, OPTFLAGS may be used now.
771 Major changes happened with this release. The goal is to take over the
772 complete kernel-event handling and provide a more efficient way to dispatch
773 kernel events. Replacing most of the current shell script logic and the
774 kernel forked helper with a netlink-daemon and a rule-based event handling.
776 o udevd listens to netlink events now. The first valid netlink event
777 will make udevd ignore any message from udevsend that contains a
778 SEQNUM, to avoid duplicate events. The forked events can be disabled
780 echo "" > /proc/sys/kernel/hotplug
781 For full support, the broken input-subsytem needs to be fixed, not to
782 bypass the driver core.
784 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
785 removed from udev itself and must be emulated by calling small
786 helper binaries provided in the extras folder:
787 make EXTRAS=extras/run_directory/
788 will build udev_run_devd and udev_run_hotplugd, which can be called
789 from a rule if needed:
790 RUN+="/sbin/udev_run_hotplugd"
791 The recommended way to handle this is to convert all the calls from
792 the directories to explicit udev rules and get completely rid of the
793 multiplexing. (To catch a ttyUSB event, you now no longer need to
794 fork and exit 300 tty script instances you are not interested in, it
795 is just one rule that matches exactly the device.)
797 o udev handles now _all_ events not just events for class and block
798 devices, this way it is possible to control the complete event
799 behavior with udev rules. Especially useful for rules like:
800 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
802 o As used in the modalias rule, udev supports now textual
803 substitution placeholder along with the usual format chars. This
804 needs to be documented, for now it's only visible in udev_rules_parse.c.
806 o The rule keys support now more operations. This is documented in the
807 man page. It is possible to add values to list-keys like the SYMLINK
808 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
809 Also "final"-assignments are supported by using KEY:="value", which will
810 prevent changing the key by any later rule.
812 o kernel 2.6.12 has the "detached_state" attribute removed from
813 sysfs, which was used to recognize sysfs population. We switched that
814 to wait for the "bus" link, which is only available in kernels after 2.6.11.
815 Running this udev version on older kernels may cause a short delay for
818 o To provide infrastructure for persistent device naming, the id programs:
819 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
820 to export the probed data in environment key format:
821 pim:~ # /sbin/ata_id --export /dev/hda
822 ID_MODEL=HTS726060M9AT00
823 ID_SERIAL=MRH401M4G6UM9B
827 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
828 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
831 kay@pim:~> tree /dev/disk
834 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
835 | `-- IBM-Memory_Key -> ../../sda
837 | |-- swap -> ../../hda1
838 | |-- date -> ../../sda1
839 | `-- home -> ../../hda3
841 |-- 2E08712B0870F2E7 -> ../../hda3
842 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
843 |-- E845-7A89 -> ../../sda1
844 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
846 The IMPORT= operation will import these keys in the environment and make
847 it available for later PROGRAM= and RUN= executed programs. The keys are
848 also stored in the udevdb and can be queried from there with one of the
851 o A few binaries are silently added to the repository, which can be used
852 to replay kernel events from initramfs instead of using coldplug. udevd
853 can be instructed now to queue-up events while the stored events from
854 initramfs are filled into the udevd-queue. This code is still under
855 development and there is no documentation now besides the code itself.
856 The additional binaries get compiled, but are not installed by default.
858 o There is also a temporary fix for a performance problem where too many
859 events happen in parallel and every event needs to parse the rules.
860 udev can now read precompiled rules stored on disk. This is likely to be
861 replaced by a more elegant solution in a future udev version.
865 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
866 Fix for libsysfs not to expect this file was added.
870 All rules are applied now, but only the first matching rule with a NAME-key
871 will be applied. All later rules with NAME-key are completely ignored. This
872 way system supplied symlinks or permissions gets applied to user-defined
876 Please check your rules setup, if you may need to add OPTIONS="last_rule"
877 to some rules, to keep the old behavior.
879 The rules are read on "remove"-events too. That makes is possible to match
880 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
881 instruct udev to ignore an event (OPTIONS="ignore_device").
882 The new ACTION-key may be used to let a rule act only at a "remove"-event.
884 The new RUN-key supports rule-based execution of programs after device-node
885 handling. This is meant as a general replacement for the dev.d/-directories
886 to give fine grained control over the execution of programs.
888 The %s{}-sysfs format char replacement values are searched at any of the
889 devices in the device chain now, not only at the class-device.
891 We support log priority levels now. The value udev_log in udev.conf is used
892 to determine what is printed to syslog. This makes it possible to
893 run a version with compiled-in debug messages in a production environment
894 which is sometimes needed to find a bug.
895 It is still possible to supress the inclusion of _any_ syslog usage with
896 USE_LOG=false to create the smallest possible binaries if needed.
897 The configured udev_log value can be overridden with the environment variable
902 Possible use of a system-wide klibc:
903 make USE_KLIBC=true KLCC=/usr/bin/klcc all
904 will link against an external klibc and our own version will be ignored.
908 We support an unlimited count of symlinks now.
910 If USE_STATIC=true is passed to a glibc build, we link statically and use
911 a built-in userdb parser to resolve user and group names.
913 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
914 we walk up the chain of physical devices to find a match.
916 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
917 easy to skip certain attribute matches without composing rules with weird
918 character class negations like:
919 KERNEL="[!s][!c][!d]*"
920 this can now be replaced with:
922 The current simple '=' is still supported, and should work as it does today,
923 but existing rules should be converted if possible, to be better readable.
925 We have new ENV{}== key now, to match against a maximum of 5 environment
928 udevstart is its own binary again, because we don't need co carry this araound
929 with every forked event.
~ianmdlvl / elogind.git / blob