5 Kernel devices and device nodes are connected now by reverse indizes in
6 /sys and /dev. A device number retrieved by a stat() or similar, the
7 kernel device directory can be found by looking up:
8 /sys/dev/{block,char}/<maj>:<min>
9 and the device node of the same device by looking up:
10 /dev/{block,char}/<maj>:<min>
14 Fix recently introduced bug, which caused a compilation without large
15 file support, where vol_id does not recognize raid signatures at the end
18 Firewire disks now create both, by-id/scsi-* and by-id/ieee-* links.
19 Seems some kernel versions prevent the creation of the ieee-* links,
20 so people used the scsi-* link which disappeared now.
22 More libudev work. Almost all udevadm functionality comes from libudev
25 udevadm trigger has a new option --type, which allows to trigger events
26 for "devices", for "subsystems", or "failed" devices. The old option
27 --retry-failed" still works, but is no longer mentioned in the man page.
33 The udevadm info --device-id-of-file= output has changed to use
34 the obvious format. Possible current users should use the --export
35 option which is not affected.
37 The old udev commands symlinks to udevadm are not installed, if
38 these symlinks are used, a warning is printed.
44 Optical drive's media is no longer probed for raid signatures,
45 reading the end of the device causes some devices to malfunction.
46 Also the offset of the last session found is used now to probe
49 The volume_id library got a major version number update to 1,
50 some deprecated functions are removed.
52 A shared library "libudev" gets installed now to provide access
53 to udev device information. DeviceKit, the successor of HAL, will
54 need this library to access the udev database and search sysfs for
56 The library is currently in an experimental state, also the API is
57 expected to change, as long as the DeviceKit integration is not
62 We use ./configure now. See INSTALL for details. Current
65 "/usr" - prefix for man pages, include files
67 "" - the root filesystem, prefix for libs and binaries
71 "lib" - directory name for libraries, not a path name
72 multilib 64bit systems may use "lib64" instead of "lib"
74 compile-in verbose debug messages
76 disable all logging and compile-out all log strings
78 link against SELInux libraries, to set the expected context
81 In the default rules, the group "disk" gets permissions 0660 instead
82 of 0640. One small step closer to unify distro rules. Some day, all
83 distros hopefully end up with the same set of rules.
85 No symlinks to udevadm are installed anymore, if they are still needed,
86 they should be provided by the package.
92 Default udev rules, which are not supposed to be edited by the user, should
93 be placed in /lib/udev/rules.d/ now, to make it clear that they are private to
94 the udev package and will be replaced with an update. Udev will pick up rule
96 /lib/udev/rules.d/ - default installed rules
97 /etc/udev/rules.d/ - user rules + on-the-fly generated rules
98 /dev/.udev/rules.d/ - temporary non-persistent rules created after bootup
99 It does not matter in which directory a rule file lives, all files are sorted
102 To help creating /dev/root, we have now:
103 $ udevadm info --export --export-prefix="ROOT_" --device-id-of-file=/
106 In case the current --device-id-of-file is already used, please switch to
107 the --export format version, it saves the output parsing and the old
108 format will be changed to use ':' as a separator, like the format in the
113 Fix cdrom_id to properly recognize blank media.
119 Tape drive id-data is queried from /dev/bsg/* instead of the tape
120 nodes. This avoids rewinding tapes on open().
126 The symlinks udevcontrol and udevtrigger are no longer installed by
129 The scsi_id program does not depend on sysfs anymore. It can speak
130 SGv4 now, so /dev/bsg/* device nodes can be used, to query SCSI device
131 data, which should solve some old problems with tape devices, where
132 we better do not open all tape device nodes to identify the device.
138 The cdrom_id program is replaced by an advanced version, which can
139 detect most common device types, and also properties of the inserted
140 media. This is part of moving some basic functionality from HAL into
141 udev (and the kernel).
147 The last WAIT_FOR_SYSFS rule is removed from the default rules.
149 The symlinks to udevadm for the debugging tools: udevmonitor and
150 udevtest are no longer created.
152 The symlinks to the udevadm man page for the old tool names are
155 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
156 should be prefixed with '@' to indicate that the path is not a
167 Udevstart is removed from the tree, it did not get installed for
168 a long time now, and is long replaced by trigger and settle.
174 All udev tools are merged into a single binary called udevadm.
175 The old names of the tools are built-in commands in udevadm now.
176 Symlinks to udevadm, with the names of the old tools, provide
177 the same functionality as the standalone tools. There is also
178 only a single udevadm.8 man page left for all tools.
180 Tools like mkinitramfs should be checked, if they need to include
181 udevadm in the list of files.
191 The etc/udev/rules.d/ directory now contains a default set of basic
192 udev rules. This initial version is the result of a rules file merge
193 of Fedora and openSUSE. For these both distros only a few specific
194 rules are left in their own file, named after the distro. Rules which
195 are optionally installed, because they are only valid for a specific
196 architecture, or rules for subsystems which are not always used are
197 in etc/udev/packages/.
203 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
204 actions by dynamically created rules.
206 SYMLINK=="<value>" matches agains the entries in the list of
207 currently defined symlinks. The links are not created in the
208 filesystem at that point in time, but the values can be matched.
210 RUN{ignore_error}+="<program>" will ignore any exit code from the
211 program and not record as a failed event.
217 Final merge of patches/features from the Ubuntu package.
223 Control characters in filesystem label strings are no longer silenty
224 removed, but hex-encoded, to be able to uniquely identify the device
225 by its symlink in /dev/disk/by-label/.
226 If libvolume_id is used by mount(8), LABEL= will work as expected,
227 if slashes or other characters are used in the label string.
229 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
230 can be specified now. The TEST key accepts an optional mode mask
231 TEST{0100}=="<is executable file>".
233 Scsi_id now supports a mode without expecting scsi-specific sysfs
234 entries to allow the extraction of cciss-device persistent properties.
240 In the future, we may see uuid's which are just simple character
241 strings (see the DDF Raid Specification). For that reason vol_id now
242 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
243 the creation of symlinks, the *_SAFE values ensure, that no control
244 or whitespace characters are used in the filename.
246 Possible users of libvolume_id, please use the volume_id_get_* functions.
247 The public struct will go away in a future release of the library.
253 Removal of useless extras/eventrecorder.sh.
263 The directory multiplexer for dev.d/ and hotplug.d are finally removed
264 from the udev package.
270 Symlinks can have priorities now, the priority is assigned to the device
271 and specified with OPTIONS="link_priority=100". Devices with higher
272 priorities overwrite the symlinks of devices with lower priorities.
273 If the device that currently owns the link, goes away, the symlink
274 will be removed, and recreated, pointing to the next device with the
275 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
276 more reliable, if multiple devices contain the same metadata and overwrite
279 The dasd_id program is removed from the udev tree, and dasdinfo, with the
280 needed rules, are part of the s390-tools now.
282 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
283 we may get the scsi sysfs mess fixed some day, and this will only catch
284 the devices we are looking for.
286 USB serial numbers for storage devices have the target:lun now appended,
287 to make it possibble to distinguish broken multi-lun devices with all
288 the same SCSI identifiers.
290 Note: The extra "run_directory" which searches and executes stuff in
291 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
292 with the next release. Make sure, that you don't use it anymore, or
293 provides your own implementation of that inefficient stuff.
294 We are tired of reports about a "slow udev", because these directories
295 contain stuff, that runs with _every_ event, instead of using rules,
296 that run programs only for the matching events.
306 DRIVER== will match only for devices that actually have a real
307 driver. DRIVERS== must be used, if parent devices should be
308 included in the match.
310 Libvolume_id's "linux_raid" detection needed another fix.
318 Add additional check to volume_id detection of via_raid, cause
319 some company decided to put a matching pattern all over the empty
320 storage area of their music players.
324 Fix path_id for SAS devices.
328 The udev daemon can be started with --debug-trace now, which will
329 execute all events serialized to get a chance to catch a possible
330 action that crashes the box.
332 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
333 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
334 are excluded from the warning. Referencing parent attributes directly
335 may break when something in the kernel driver model changes. Udev will
336 just find the attribute by walking up the parent chain.
338 Udevtrigger now sorts the list of devices depending on the device
339 dependency, so a "usb" device is triggered after the parent "pci"
344 Revert persistent-storage ata-serial '_' '-' replacement.
350 Udevtrigger can now filter the list of devices to be triggered. Matches
351 for subsystems or sysfs attributes can be specified.
353 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
354 zero-sized files to avoid pointing to /sys and confuse broken tools which
355 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
358 The rules and scripts to create udev rules for persistent network
359 devices and optical drives are in the extras/rules_generator directory
360 now. If you use something similar, please consider replacing your own
361 version with this, to share the support effort. The rule_generator
362 installs its own rules into /etc/udev/rules.d.
364 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
365 the rule_generator depends on cdrom_id to be called in an earlier rule.
371 Renaming of some key names (the old names still work):
372 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
373 (The behavior of the key DRIVER will change soon in one of the next
374 releases, to match only the event device, please switch to DRIVERS
375 instead. If DRIVER is used, it will behave like DRIVERS, but an error
377 With the new key names, we have a more consistent and simpler scheme.
378 We can match the properties of the event device only, with: KERNEL,
379 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
380 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
381 longer mentioned in the man page and should be switched in the rule
384 ATTR{file}="value" can be used now, to write to a sysfs file of the
385 event device. Instead of:
386 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
388 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
390 All the PHYSDEV* keys are deprecated and will be removed from a
392 PHYDEVPATH - is the path of a parent device and should not be
394 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
395 matched with SUBSYSTEMS==
396 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
397 Newer kernels will have DRIVER in the environment,
398 for older kernels udev puts in. Class device will
399 no longer carry this property of a parent and
400 DRIVERS== can be used to match such a parent value.
401 Note that ENV{DRIVER} is only available for a few bus devices, where
402 the driver is already bound at device event time. On coldplug, the
403 events for a lot devices are already bound to a driver, and they will have
404 that value set. But on hotplug, at the time the kernel creates the device,
405 it can't know what driver may claim the device after that, therefore
406 in most cases it will be empty.
408 Failed events should now be re-triggered with:
409 udevtrigger --retry-failed.
410 Please switch to this command, so we keep the details of the /dev/.udev/failed/
411 files private to the udev tools. We may need to switch the current symlink
412 target, cause some obviously broken tools try to scan all files in /dev
413 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
414 million times. This takes ages on slow boxes.
416 The udevinfo attribute walk (-a) now works with giving a device node
417 name (-n) instead of a devpath (-p). The query now always works, also when
418 no database file was created by udev.
420 The built-in /etc/passwd /etc/group parser is removed, we always depend on
421 getpwnam() and getgrnam() now. One of the next releases will depend on
422 fnmatch() and may use getopt_long().
426 Bugfixes and small improvements.
430 Fix path_id for recent kernels.
436 Added support for swapping network interface names, by temporarily
437 renaming the device and wait for the target name to become free.
441 The built-in MODALIAS key and substitution is removed.
445 The binary firmware helper is replaced by the usual simple
446 shell script. Udevsend is removed from the tree.
454 Some more keys require the correct use of '==' and '=' depending
455 on the kind of operation beeing an assignment or a match. Rules
456 with invalid operations are skipped and logged to syslog. Please
457 test with udevtest if the parsing of your rules throws errors and
458 fix possibly broken rules.
462 Provide "udevsettle" to wait for all current udev events to finish.
463 It also watches the current kernel netlink queue by comparing the
464 even sequence number to make sure that there are no current pending
465 events that have not already arrived in the daemon.
469 Fix rule to skip persistent rules for removable IDE devices, which
470 also skipped optical IDE drives.
472 All *_id program are installed in /lib/udev/ by default now.
474 No binary is stripped anymore as this should be done in the
475 packaging process and not at build time.
477 libvolume_id is provided as a shared library now and vol_id is
478 linked against it. Also one of the next HAL versions will require
479 this library, and the HAL build process will also require the
480 header file to be installed. The copy of the same code in HAL will
481 be removed to have only a single copy left on the system.
485 Add persistent links for SCSI tapes. The rules file is renamed
486 to 60-persistent-storage.rules.
488 Create persistent path for usb devices. Can be used for all sorts
489 of devices that can't be distinguished by other properties like
490 multiple identical keyboards and mice connected to the same box.
492 Provide "udevtrigger" program to request events on coldplug. The
493 shell script is much too slow with thousends of devices.
497 Fix persistent disk rules to exclude removable IDE drives.
499 Warn if %e, $modalias or MODALIAS is used.
503 Fix queue export, which wasn't correct for subsequent add/remove
504 events for the same device.
508 Fix cramfs detection on big endian.
510 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
515 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
516 attributes were only checked at the parent device that matched the
517 by BUS requested subsystem. Fix it to also look at the device we
518 received the event for.
520 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
525 Fix a bug where NAME="" would prevent RUN from beeing executed.
527 RUN="/bin/program" does not longer automatically add the subsystem
528 as the first parameter. This is from the days of /sbin/hotplug
529 which is dead now and it's just confusing to need to add a space at
530 the end of the program name to prevent this.
531 If you use rules that need the subsystem as the first parameter,
532 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
533 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
537 The udev man page has moved to udev(7) as it does not describe a command
538 anymore. The programs udev, udevstart and udevsend are no longer installed
539 by default and must be copied manually, if they should be installed or
540 included in a package.
542 Fix a bug where "ignore_device" could run earlier collected RUN keys before
543 the ignore rule was applied.
545 More preparation for future sysfs changes. usb_id and scsi_id no longer
546 depend on a magic order of devices in the /devices chain. Specific devices
547 should be requested by their subsytem.
549 This will always find the scsi parent device without depending on a specific
551 dev = sysfs_device_get(devpath);
552 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
554 The "device" link in the current sysfs layout will be automatically
555 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
556 parent in the devpath. If a device is requested by it's symlink, like all
557 class devices in the new sysfs layout will look like, it gets automatically
558 resolved and substituted with the real devpath and not the symlink path.
561 A similar logic must be applied to _all_ sysfs users, including
562 scripts, that search along parent devices in sysfs. The explicit use of
563 the "device" link must be avoided. With the future sysfs layout all
564 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
565 back to the "class" or the "bus". The layout of the parent devices in
566 /devices is not necessarily expected to be stable across kernel releases and
567 searching for parents by their subsystem should make sysfs users tolerant
568 for changed parent chains.
572 Prepare udev to work with the experimental kernel patch, that moves
573 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
575 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
576 moving the class devices to /sys/devices.
578 Thanks again to Marco for help finding a hopefully nice compromise
579 to make %b simpler and working again.
583 Complete removal of libsysfs, replaced by simple helper functions
584 which are much simpler and a bit faster. The udev daemon operatesentirely
585 on event parameters and does not use sysfs for simple rules anymore.
586 Please report any new bugs/problems, that may be caused by this big
587 change. They will be fixed immediately.
589 The enumeration format character '%e' is deprecated and will be
590 removed sometimes from a future udev version. It never worked correctly
591 outside of udevstart, so we can't use it with the new parallel
592 coldplug. A simple enumeration is as useless as the devfs naming
593 scheme, just get rid of both if you still use it.
595 MODALIAS and $modalias is not needed and will be removed from one of
596 the next udev versions, replace it in all rules with ENV{MODALIAS} or
597 the sysfs "modalias" value.
599 Thanks a lot to Marco for all his help on finding and fixing bugs.
603 Let scsi_id request libata drive serial numbers from page 0x80.
605 Renamed etc/udev/persistent.rules to persistent-disk.rules and
606 added /dev/disk/by-name/* for device mapper device names.
608 Removed %e from the man page. It never worked reliably outside
609 of udevstart and udevstart is no longer recommended to use.
613 Symlinks are now exported to the event environment. Hopefully it's no
614 longer needed to run udevinfo from an event process, like it was
615 mentioned on the hotplug list:
616 UDEV [1134776873.702967] add@/block/sdb
619 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
623 Fix a problem if udevsend is used as the hotplug handler and tries to use
624 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
625 and this kind of problems will hopefully go away soon.
629 All built-in logic to work around bad sysfs timing is removed with this
630 version. The need to wait for sysfs files is almost fixed with a kernel
631 version that doesn't work with this udev version anyway. Until we fix
632 the timing of the "bus" link creation, the former integrated logic should
633 be emulated by a rule placed before all other rules:
634 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
636 The option "udev_db" does no longer exist. All udev state will be in
637 /$udev_root/.udev/ now, there is no longer an option to set this
639 If the init script or something else used this value, just depend on
640 this hardcoded path. But remember _all_content_ of this directory is
641 still private to udev and can change at any time.
643 Default location for rule sripts and helper programs is now: /lib/udev/.
644 Everything that is not useful on the commandline should go into this
645 directory. Some of the helpers in the extras folder are installed there
646 now. The rules need to be changed, to find the helpers there.
648 Also /lib/udev/devices is recommended as a directory where packages or
649 the user can place real device nodes, which get copied over to /dev at
650 every boot. This should replace the various solutions with custom config
653 Udevsend does no longer start the udev daemon. This must be done with
654 the init script that prepares /dev on tmpfs and creates the initial nodes,
655 before starting the daemon.
659 Silent a too verbose error logging for the old hotplug.d/ dev.d/
662 The copy of klibc is removed. A systemwide installed version of klibc
663 should be used to build a klibc udev now.
667 NAME="" will not create any nodes, but execute RUN keys. To completely
668 ignore an event the OPTION "ignore_device" should be used.
670 After removal of the reorder queue, events with a TIMEOUT can be executed
671 without any queuing now.
675 Fixed bug in udevd, if inotify is not available. We depend on netlink
676 uevents now, kernels without that event source will not work with that
677 version of udev anymore.
681 The rule parsing happens now in the daemon once at startup, all udev
682 event processes inherit the already parsed rules from the daemon.
683 It is shipped with SUSE10.0 and reduces heavily the system load at
684 startup. The option to save precompiled rules and let the udev process
685 pick the them up is removed, as it's no longer needed.
687 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
688 device. Libsysfs is changed to "translate" the requested link into the
689 real device path, as it would happen with the hotplug event. Otherwise
690 device removal and the udev database will not work.
692 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
695 A few improvements for vol_id, the filesytem probing code.
699 Fix a stupid typo in extras/run_directory for "make install".
701 scsi_id creates the temporary devnode now in /dev for usage with a
702 non-writable /tmp directory.
704 The uevent kernel socket buffer can carry app. 50.000 events now,
705 let's see who can break this again. :)
707 The upcoming kernel will have a new input driver core integration.
708 Some class devices are now symlinks to the real device. libsysfs
709 needs a fix for this to work correctly. Udevstart of older udev
710 versions will _not_ create these devices!
714 Fix a 'install' target in the Makefile, that prevents EXTRAS from
719 A bunch of mostly trivial bugfixes. From now on no node name or
720 symlink name can contain any character than plain whitelisted ascii
721 characters or validated utf8 byte-streams. This is needed for the
722 /dev/disk/by-label/* links, because we import untrusted data and
723 export it to the filesystem.
727 More bugfixes. If udevd was started from the kernel, we don't
728 have stdin/stdout/stderr, which broke the forked tools in some
733 Bugfix. udevstart event ordering was broken for a long time.
734 The new run_program() uncovered it, because /dev/null was not
735 available while we try to run external programs.
736 Now udevstart should create it before we run anything.
740 Minor bugfixes and some distro rules updates. If you don't have the
741 persistent disk rules in /dev/disk/by-*/* on your distro, just
742 grab it from here. :)
746 We can use socket communication now to pass events from udev to
748 RUN+="socket:/org/freedesktop/hal/udev_event"
749 will pass the whole udev event to the HAL daemon without the need
750 for a forked helper. (See ChangeLog for udevmonitor, as an example)
754 Mostly bugfixes and see ChangeLog.
756 The test for the existence of an environment value should be
758 ENV{KEY}=="*" to ENV{KEY}=="?*"
759 because "*" will not fail anymore, if the key does not exist or
764 Bugfixes and a few tweaks described in the ChangeLog.
768 Mostly a Bugfix release.
770 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
771 timing with custom rules.
775 We changed the internal rule storage format. Our large rule files took
776 2 MB of RAM, with the change we are down to 99kB.
778 If the device-node has been created with default name and no symlink or
779 options are to remenber, it is not longer stored in the udevdb. HAL will
780 need to be updated to work correctly with that change.
782 To overrride optimization flags, OPTFLAGS may be used now.
790 Major changes happened with this release. The goal is to take over the
791 complete kernel-event handling and provide a more efficient way to dispatch
792 kernel events. Replacing most of the current shell script logic and the
793 kernel forked helper with a netlink-daemon and a rule-based event handling.
795 o udevd listens to netlink events now. The first valid netlink event
796 will make udevd ignore any message from udevsend that contains a
797 SEQNUM, to avoid duplicate events. The forked events can be disabled
799 echo "" > /proc/sys/kernel/hotplug
800 For full support, the broken input-subsytem needs to be fixed, not to
801 bypass the driver core.
803 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
804 removed from udev itself and must be emulated by calling small
805 helper binaries provided in the extras folder:
806 make EXTRAS=extras/run_directory/
807 will build udev_run_devd and udev_run_hotplugd, which can be called
808 from a rule if needed:
809 RUN+="/sbin/udev_run_hotplugd"
810 The recommended way to handle this is to convert all the calls from
811 the directories to explicit udev rules and get completely rid of the
812 multiplexing. (To catch a ttyUSB event, you now no longer need to
813 fork and exit 300 tty script instances you are not interested in, it
814 is just one rule that matches exactly the device.)
816 o udev handles now _all_ events not just events for class and block
817 devices, this way it is possible to control the complete event
818 behavior with udev rules. Especially useful for rules like:
819 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
821 o As used in the modalias rule, udev supports now textual
822 substitution placeholder along with the usual format chars. This
823 needs to be documented, for now it's only visible in udev_rules_parse.c.
825 o The rule keys support now more operations. This is documented in the
826 man page. It is possible to add values to list-keys like the SYMLINK
827 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
828 Also "final"-assignments are supported by using KEY:="value", which will
829 prevent changing the key by any later rule.
831 o kernel 2.6.12 has the "detached_state" attribute removed from
832 sysfs, which was used to recognize sysfs population. We switched that
833 to wait for the "bus" link, which is only available in kernels after 2.6.11.
834 Running this udev version on older kernels may cause a short delay for
837 o To provide infrastructure for persistent device naming, the id programs:
838 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
839 to export the probed data in environment key format:
840 pim:~ # /sbin/ata_id --export /dev/hda
841 ID_MODEL=HTS726060M9AT00
842 ID_SERIAL=MRH401M4G6UM9B
846 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
847 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
850 kay@pim:~> tree /dev/disk
853 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
854 | `-- IBM-Memory_Key -> ../../sda
856 | |-- swap -> ../../hda1
857 | |-- date -> ../../sda1
858 | `-- home -> ../../hda3
860 |-- 2E08712B0870F2E7 -> ../../hda3
861 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
862 |-- E845-7A89 -> ../../sda1
863 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
865 The IMPORT= operation will import these keys in the environment and make
866 it available for later PROGRAM= and RUN= executed programs. The keys are
867 also stored in the udevdb and can be queried from there with one of the
870 o A few binaries are silently added to the repository, which can be used
871 to replay kernel events from initramfs instead of using coldplug. udevd
872 can be instructed now to queue-up events while the stored events from
873 initramfs are filled into the udevd-queue. This code is still under
874 development and there is no documentation now besides the code itself.
875 The additional binaries get compiled, but are not installed by default.
877 o There is also a temporary fix for a performance problem where too many
878 events happen in parallel and every event needs to parse the rules.
879 udev can now read precompiled rules stored on disk. This is likely to be
880 replaced by a more elegant solution in a future udev version.
884 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
885 Fix for libsysfs not to expect this file was added.
889 All rules are applied now, but only the first matching rule with a NAME-key
890 will be applied. All later rules with NAME-key are completely ignored. This
891 way system supplied symlinks or permissions gets applied to user-defined
895 Please check your rules setup, if you may need to add OPTIONS="last_rule"
896 to some rules, to keep the old behavior.
898 The rules are read on "remove"-events too. That makes is possible to match
899 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
900 instruct udev to ignore an event (OPTIONS="ignore_device").
901 The new ACTION-key may be used to let a rule act only at a "remove"-event.
903 The new RUN-key supports rule-based execution of programs after device-node
904 handling. This is meant as a general replacement for the dev.d/-directories
905 to give fine grained control over the execution of programs.
907 The %s{}-sysfs format char replacement values are searched at any of the
908 devices in the device chain now, not only at the class-device.
910 We support log priority levels now. The value udev_log in udev.conf is used
911 to determine what is printed to syslog. This makes it possible to
912 run a version with compiled-in debug messages in a production environment
913 which is sometimes needed to find a bug.
914 It is still possible to supress the inclusion of _any_ syslog usage with
915 USE_LOG=false to create the smallest possible binaries if needed.
916 The configured udev_log value can be overridden with the environment variable
921 Possible use of a system-wide klibc:
922 make USE_KLIBC=true KLCC=/usr/bin/klcc all
923 will link against an external klibc and our own version will be ignored.
927 We support an unlimited count of symlinks now.
929 If USE_STATIC=true is passed to a glibc build, we link statically and use
930 a built-in userdb parser to resolve user and group names.
932 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
933 we walk up the chain of physical devices to find a match.
935 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
936 easy to skip certain attribute matches without composing rules with weird
937 character class negations like:
938 KERNEL="[!s][!c][!d]*"
939 this can now be replaced with:
941 The current simple '=' is still supported, and should work as it does today,
942 but existing rules should be converted if possible, to be better readable.
944 We have new ENV{}== key now, to match against a maximum of 5 environment
947 udevstart is its own binary again, because we don't need co carry this araound
948 with every forked event.
~ianmdlvl / elogind.git / blob