3 Fix recently introduced bug, which caused a compilation without large
4 file support, where vol_id does not recognize raid signatures at the end
7 Firewire disks now create both, by-id/scsi-* and by-id/ieee-* links.
8 Seems some kernel versions prevent the creation of the ieee-* links,
9 so people used the scsi-* link which disappeared now.
11 More libudev work. Almost all udevadm functionality comes from libudev
14 udevadm trigger has a new option --type, which allows to trigger events
15 for "devices", for "subsystems", or "failed" devices. The old option
16 --retry-failed" still works, but is no longer mentioned in the man page.
22 The udevadm info --device-id-of-file= output has changed to use
23 the obvious format. Possible current users should use the --export
24 option which is not affected.
26 The old udev commands symlinks to udevadm are not installed, if
27 these symlinks are used, a warning is printed.
33 Optical drive's media is no longer probed for raid signatures,
34 reading the end of the device causes some devices to malfunction.
35 Also the offset of the last session found is used now to probe
38 The volume_id library got a major version number update to 1,
39 some deprecated functions are removed.
41 A shared library "libudev" gets installed now to provide access
42 to udev device information. DeviceKit, the successor of HAL, will
43 need this library to access the udev database and search sysfs for
45 The library is currently in an experimental state, also the API is
46 expected to change, as long as the DeviceKit integration is not
51 We use ./configure now. See INSTALL for details. Current
54 "/usr" - prefix for man pages, include files
56 "" - the root filesystem, prefix for libs and binaries
60 "lib" - directory name for libraries, not a path name
61 multilib 64bit systems may use "lib64" instead of "lib"
63 compile-in verbose debug messages
65 disable all logging and compile-out all log strings
67 link against SELInux libraries, to set the expected context
70 In the default rules, the group "disk" gets permissions 0660 instead
71 of 0640. One small step closer to unify distro rules. Some day, all
72 distros hopefully end up with the same set of rules.
74 No symlinks to udevadm are installed anymore, if they are still needed,
75 they should be provided by the package.
81 Default udev rules, which are not supposed to be edited by the user, should
82 be placed in /lib/udev/rules.d/ now, to make it clear that they are private to
83 the udev package and will be replaced with an update. Udev will pick up rule
85 /lib/udev/rules.d/ - default installed rules
86 /etc/udev/rules.d/ - user rules + on-the-fly generated rules
87 /dev/.udev/rules.d/ - temporary non-persistent rules created after bootup
88 It does not matter in which directory a rule file lives, all files are sorted
91 To help creating /dev/root, we have now:
92 $ udevadm info --export --export-prefix="ROOT_" --device-id-of-file=/
95 In case the current --device-id-of-file is already used, please switch to
96 the --export format version, it saves the output parsing and the old
97 format will be changed to use ':' as a separator, like the format in the
102 Fix cdrom_id to properly recognize blank media.
108 Tape drive id-data is queried from /dev/bsg/* instead of the tape
109 nodes. This avoids rewinding tapes on open().
115 The symlinks udevcontrol and udevtrigger are no longer installed by
118 The scsi_id program does not depend on sysfs anymore. It can speak
119 SGv4 now, so /dev/bsg/* device nodes can be used, to query SCSI device
120 data, which should solve some old problems with tape devices, where
121 we better do not open all tape device nodes to identify the device.
127 The cdrom_id program is replaced by an advanced version, which can
128 detect most common device types, and also properties of the inserted
129 media. This is part of moving some basic functionality from HAL into
130 udev (and the kernel).
136 The last WAIT_FOR_SYSFS rule is removed from the default rules.
138 The symlinks to udevadm for the debugging tools: udevmonitor and
139 udevtest are no longer created.
141 The symlinks to the udevadm man page for the old tool names are
144 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
145 should be prefixed with '@' to indicate that the path is not a
156 Udevstart is removed from the tree, it did not get installed for
157 a long time now, and is long replaced by trigger and settle.
163 All udev tools are merged into a single binary called udevadm.
164 The old names of the tools are built-in commands in udevadm now.
165 Symlinks to udevadm, with the names of the old tools, provide
166 the same functionality as the standalone tools. There is also
167 only a single udevadm.8 man page left for all tools.
169 Tools like mkinitramfs should be checked, if they need to include
170 udevadm in the list of files.
180 The etc/udev/rules.d/ directory now contains a default set of basic
181 udev rules. This initial version is the result of a rules file merge
182 of Fedora and openSUSE. For these both distros only a few specific
183 rules are left in their own file, named after the distro. Rules which
184 are optionally installed, because they are only valid for a specific
185 architecture, or rules for subsystems which are not always used are
186 in etc/udev/packages/.
192 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
193 actions by dynamically created rules.
195 SYMLINK=="<value>" matches agains the entries in the list of
196 currently defined symlinks. The links are not created in the
197 filesystem at that point in time, but the values can be matched.
199 RUN{ignore_error}+="<program>" will ignore any exit code from the
200 program and not record as a failed event.
206 Final merge of patches/features from the Ubuntu package.
212 Control characters in filesystem label strings are no longer silenty
213 removed, but hex-encoded, to be able to uniquely identify the device
214 by its symlink in /dev/disk/by-label/.
215 If libvolume_id is used by mount(8), LABEL= will work as expected,
216 if slashes or other characters are used in the label string.
218 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
219 can be specified now. The TEST key accepts an optional mode mask
220 TEST{0100}=="<is executable file>".
222 Scsi_id now supports a mode without expecting scsi-specific sysfs
223 entries to allow the extraction of cciss-device persistent properties.
229 In the future, we may see uuid's which are just simple character
230 strings (see the DDF Raid Specification). For that reason vol_id now
231 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
232 the creation of symlinks, the *_SAFE values ensure, that no control
233 or whitespace characters are used in the filename.
235 Possible users of libvolume_id, please use the volume_id_get_* functions.
236 The public struct will go away in a future release of the library.
242 Removal of useless extras/eventrecorder.sh.
252 The directory multiplexer for dev.d/ and hotplug.d are finally removed
253 from the udev package.
259 Symlinks can have priorities now, the priority is assigned to the device
260 and specified with OPTIONS="link_priority=100". Devices with higher
261 priorities overwrite the symlinks of devices with lower priorities.
262 If the device that currently owns the link, goes away, the symlink
263 will be removed, and recreated, pointing to the next device with the
264 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
265 more reliable, if multiple devices contain the same metadata and overwrite
268 The dasd_id program is removed from the udev tree, and dasdinfo, with the
269 needed rules, are part of the s390-tools now.
271 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
272 we may get the scsi sysfs mess fixed some day, and this will only catch
273 the devices we are looking for.
275 USB serial numbers for storage devices have the target:lun now appended,
276 to make it possibble to distinguish broken multi-lun devices with all
277 the same SCSI identifiers.
279 Note: The extra "run_directory" which searches and executes stuff in
280 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
281 with the next release. Make sure, that you don't use it anymore, or
282 provides your own implementation of that inefficient stuff.
283 We are tired of reports about a "slow udev", because these directories
284 contain stuff, that runs with _every_ event, instead of using rules,
285 that run programs only for the matching events.
295 DRIVER== will match only for devices that actually have a real
296 driver. DRIVERS== must be used, if parent devices should be
297 included in the match.
299 Libvolume_id's "linux_raid" detection needed another fix.
307 Add additional check to volume_id detection of via_raid, cause
308 some company decided to put a matching pattern all over the empty
309 storage area of their music players.
313 Fix path_id for SAS devices.
317 The udev daemon can be started with --debug-trace now, which will
318 execute all events serialized to get a chance to catch a possible
319 action that crashes the box.
321 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
322 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
323 are excluded from the warning. Referencing parent attributes directly
324 may break when something in the kernel driver model changes. Udev will
325 just find the attribute by walking up the parent chain.
327 Udevtrigger now sorts the list of devices depending on the device
328 dependency, so a "usb" device is triggered after the parent "pci"
333 Revert persistent-storage ata-serial '_' '-' replacement.
339 Udevtrigger can now filter the list of devices to be triggered. Matches
340 for subsystems or sysfs attributes can be specified.
342 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
343 zero-sized files to avoid pointing to /sys and confuse broken tools which
344 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
347 The rules and scripts to create udev rules for persistent network
348 devices and optical drives are in the extras/rules_generator directory
349 now. If you use something similar, please consider replacing your own
350 version with this, to share the support effort. The rule_generator
351 installs its own rules into /etc/udev/rules.d.
353 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
354 the rule_generator depends on cdrom_id to be called in an earlier rule.
360 Renaming of some key names (the old names still work):
361 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
362 (The behavior of the key DRIVER will change soon in one of the next
363 releases, to match only the event device, please switch to DRIVERS
364 instead. If DRIVER is used, it will behave like DRIVERS, but an error
366 With the new key names, we have a more consistent and simpler scheme.
367 We can match the properties of the event device only, with: KERNEL,
368 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
369 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
370 longer mentioned in the man page and should be switched in the rule
373 ATTR{file}="value" can be used now, to write to a sysfs file of the
374 event device. Instead of:
375 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
377 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
379 All the PHYSDEV* keys are deprecated and will be removed from a
381 PHYDEVPATH - is the path of a parent device and should not be
383 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
384 matched with SUBSYSTEMS==
385 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
386 Newer kernels will have DRIVER in the environment,
387 for older kernels udev puts in. Class device will
388 no longer carry this property of a parent and
389 DRIVERS== can be used to match such a parent value.
390 Note that ENV{DRIVER} is only available for a few bus devices, where
391 the driver is already bound at device event time. On coldplug, the
392 events for a lot devices are already bound to a driver, and they will have
393 that value set. But on hotplug, at the time the kernel creates the device,
394 it can't know what driver may claim the device after that, therefore
395 in most cases it will be empty.
397 Failed events should now be re-triggered with:
398 udevtrigger --retry-failed.
399 Please switch to this command, so we keep the details of the /dev/.udev/failed/
400 files private to the udev tools. We may need to switch the current symlink
401 target, cause some obviously broken tools try to scan all files in /dev
402 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
403 million times. This takes ages on slow boxes.
405 The udevinfo attribute walk (-a) now works with giving a device node
406 name (-n) instead of a devpath (-p). The query now always works, also when
407 no database file was created by udev.
409 The built-in /etc/passwd /etc/group parser is removed, we always depend on
410 getpwnam() and getgrnam() now. One of the next releases will depend on
411 fnmatch() and may use getopt_long().
415 Bugfixes and small improvements.
419 Fix path_id for recent kernels.
425 Added support for swapping network interface names, by temporarily
426 renaming the device and wait for the target name to become free.
430 The built-in MODALIAS key and substitution is removed.
434 The binary firmware helper is replaced by the usual simple
435 shell script. Udevsend is removed from the tree.
443 Some more keys require the correct use of '==' and '=' depending
444 on the kind of operation beeing an assignment or a match. Rules
445 with invalid operations are skipped and logged to syslog. Please
446 test with udevtest if the parsing of your rules throws errors and
447 fix possibly broken rules.
451 Provide "udevsettle" to wait for all current udev events to finish.
452 It also watches the current kernel netlink queue by comparing the
453 even sequence number to make sure that there are no current pending
454 events that have not already arrived in the daemon.
458 Fix rule to skip persistent rules for removable IDE devices, which
459 also skipped optical IDE drives.
461 All *_id program are installed in /lib/udev/ by default now.
463 No binary is stripped anymore as this should be done in the
464 packaging process and not at build time.
466 libvolume_id is provided as a shared library now and vol_id is
467 linked against it. Also one of the next HAL versions will require
468 this library, and the HAL build process will also require the
469 header file to be installed. The copy of the same code in HAL will
470 be removed to have only a single copy left on the system.
474 Add persistent links for SCSI tapes. The rules file is renamed
475 to 60-persistent-storage.rules.
477 Create persistent path for usb devices. Can be used for all sorts
478 of devices that can't be distinguished by other properties like
479 multiple identical keyboards and mice connected to the same box.
481 Provide "udevtrigger" program to request events on coldplug. The
482 shell script is much too slow with thousends of devices.
486 Fix persistent disk rules to exclude removable IDE drives.
488 Warn if %e, $modalias or MODALIAS is used.
492 Fix queue export, which wasn't correct for subsequent add/remove
493 events for the same device.
497 Fix cramfs detection on big endian.
499 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
504 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
505 attributes were only checked at the parent device that matched the
506 by BUS requested subsystem. Fix it to also look at the device we
507 received the event for.
509 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
514 Fix a bug where NAME="" would prevent RUN from beeing executed.
516 RUN="/bin/program" does not longer automatically add the subsystem
517 as the first parameter. This is from the days of /sbin/hotplug
518 which is dead now and it's just confusing to need to add a space at
519 the end of the program name to prevent this.
520 If you use rules that need the subsystem as the first parameter,
521 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
522 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
526 The udev man page has moved to udev(7) as it does not describe a command
527 anymore. The programs udev, udevstart and udevsend are no longer installed
528 by default and must be copied manually, if they should be installed or
529 included in a package.
531 Fix a bug where "ignore_device" could run earlier collected RUN keys before
532 the ignore rule was applied.
534 More preparation for future sysfs changes. usb_id and scsi_id no longer
535 depend on a magic order of devices in the /devices chain. Specific devices
536 should be requested by their subsytem.
538 This will always find the scsi parent device without depending on a specific
540 dev = sysfs_device_get(devpath);
541 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
543 The "device" link in the current sysfs layout will be automatically
544 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
545 parent in the devpath. If a device is requested by it's symlink, like all
546 class devices in the new sysfs layout will look like, it gets automatically
547 resolved and substituted with the real devpath and not the symlink path.
550 A similar logic must be applied to _all_ sysfs users, including
551 scripts, that search along parent devices in sysfs. The explicit use of
552 the "device" link must be avoided. With the future sysfs layout all
553 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
554 back to the "class" or the "bus". The layout of the parent devices in
555 /devices is not necessarily expected to be stable across kernel releases and
556 searching for parents by their subsystem should make sysfs users tolerant
557 for changed parent chains.
561 Prepare udev to work with the experimental kernel patch, that moves
562 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
564 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
565 moving the class devices to /sys/devices.
567 Thanks again to Marco for help finding a hopefully nice compromise
568 to make %b simpler and working again.
572 Complete removal of libsysfs, replaced by simple helper functions
573 which are much simpler and a bit faster. The udev daemon operatesentirely
574 on event parameters and does not use sysfs for simple rules anymore.
575 Please report any new bugs/problems, that may be caused by this big
576 change. They will be fixed immediately.
578 The enumeration format character '%e' is deprecated and will be
579 removed sometimes from a future udev version. It never worked correctly
580 outside of udevstart, so we can't use it with the new parallel
581 coldplug. A simple enumeration is as useless as the devfs naming
582 scheme, just get rid of both if you still use it.
584 MODALIAS and $modalias is not needed and will be removed from one of
585 the next udev versions, replace it in all rules with ENV{MODALIAS} or
586 the sysfs "modalias" value.
588 Thanks a lot to Marco for all his help on finding and fixing bugs.
592 Let scsi_id request libata drive serial numbers from page 0x80.
594 Renamed etc/udev/persistent.rules to persistent-disk.rules and
595 added /dev/disk/by-name/* for device mapper device names.
597 Removed %e from the man page. It never worked reliably outside
598 of udevstart and udevstart is no longer recommended to use.
602 Symlinks are now exported to the event environment. Hopefully it's no
603 longer needed to run udevinfo from an event process, like it was
604 mentioned on the hotplug list:
605 UDEV [1134776873.702967] add@/block/sdb
608 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
612 Fix a problem if udevsend is used as the hotplug handler and tries to use
613 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
614 and this kind of problems will hopefully go away soon.
618 All built-in logic to work around bad sysfs timing is removed with this
619 version. The need to wait for sysfs files is almost fixed with a kernel
620 version that doesn't work with this udev version anyway. Until we fix
621 the timing of the "bus" link creation, the former integrated logic should
622 be emulated by a rule placed before all other rules:
623 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
625 The option "udev_db" does no longer exist. All udev state will be in
626 /$udev_root/.udev/ now, there is no longer an option to set this
628 If the init script or something else used this value, just depend on
629 this hardcoded path. But remember _all_content_ of this directory is
630 still private to udev and can change at any time.
632 Default location for rule sripts and helper programs is now: /lib/udev/.
633 Everything that is not useful on the commandline should go into this
634 directory. Some of the helpers in the extras folder are installed there
635 now. The rules need to be changed, to find the helpers there.
637 Also /lib/udev/devices is recommended as a directory where packages or
638 the user can place real device nodes, which get copied over to /dev at
639 every boot. This should replace the various solutions with custom config
642 Udevsend does no longer start the udev daemon. This must be done with
643 the init script that prepares /dev on tmpfs and creates the initial nodes,
644 before starting the daemon.
648 Silent a too verbose error logging for the old hotplug.d/ dev.d/
651 The copy of klibc is removed. A systemwide installed version of klibc
652 should be used to build a klibc udev now.
656 NAME="" will not create any nodes, but execute RUN keys. To completely
657 ignore an event the OPTION "ignore_device" should be used.
659 After removal of the reorder queue, events with a TIMEOUT can be executed
660 without any queuing now.
664 Fixed bug in udevd, if inotify is not available. We depend on netlink
665 uevents now, kernels without that event source will not work with that
666 version of udev anymore.
670 The rule parsing happens now in the daemon once at startup, all udev
671 event processes inherit the already parsed rules from the daemon.
672 It is shipped with SUSE10.0 and reduces heavily the system load at
673 startup. The option to save precompiled rules and let the udev process
674 pick the them up is removed, as it's no longer needed.
676 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
677 device. Libsysfs is changed to "translate" the requested link into the
678 real device path, as it would happen with the hotplug event. Otherwise
679 device removal and the udev database will not work.
681 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
684 A few improvements for vol_id, the filesytem probing code.
688 Fix a stupid typo in extras/run_directory for "make install".
690 scsi_id creates the temporary devnode now in /dev for usage with a
691 non-writable /tmp directory.
693 The uevent kernel socket buffer can carry app. 50.000 events now,
694 let's see who can break this again. :)
696 The upcoming kernel will have a new input driver core integration.
697 Some class devices are now symlinks to the real device. libsysfs
698 needs a fix for this to work correctly. Udevstart of older udev
699 versions will _not_ create these devices!
703 Fix a 'install' target in the Makefile, that prevents EXTRAS from
708 A bunch of mostly trivial bugfixes. From now on no node name or
709 symlink name can contain any character than plain whitelisted ascii
710 characters or validated utf8 byte-streams. This is needed for the
711 /dev/disk/by-label/* links, because we import untrusted data and
712 export it to the filesystem.
716 More bugfixes. If udevd was started from the kernel, we don't
717 have stdin/stdout/stderr, which broke the forked tools in some
722 Bugfix. udevstart event ordering was broken for a long time.
723 The new run_program() uncovered it, because /dev/null was not
724 available while we try to run external programs.
725 Now udevstart should create it before we run anything.
729 Minor bugfixes and some distro rules updates. If you don't have the
730 persistent disk rules in /dev/disk/by-*/* on your distro, just
731 grab it from here. :)
735 We can use socket communication now to pass events from udev to
737 RUN+="socket:/org/freedesktop/hal/udev_event"
738 will pass the whole udev event to the HAL daemon without the need
739 for a forked helper. (See ChangeLog for udevmonitor, as an example)
743 Mostly bugfixes and see ChangeLog.
745 The test for the existence of an environment value should be
747 ENV{KEY}=="*" to ENV{KEY}=="?*"
748 because "*" will not fail anymore, if the key does not exist or
753 Bugfixes and a few tweaks described in the ChangeLog.
757 Mostly a Bugfix release.
759 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
760 timing with custom rules.
764 We changed the internal rule storage format. Our large rule files took
765 2 MB of RAM, with the change we are down to 99kB.
767 If the device-node has been created with default name and no symlink or
768 options are to remenber, it is not longer stored in the udevdb. HAL will
769 need to be updated to work correctly with that change.
771 To overrride optimization flags, OPTFLAGS may be used now.
779 Major changes happened with this release. The goal is to take over the
780 complete kernel-event handling and provide a more efficient way to dispatch
781 kernel events. Replacing most of the current shell script logic and the
782 kernel forked helper with a netlink-daemon and a rule-based event handling.
784 o udevd listens to netlink events now. The first valid netlink event
785 will make udevd ignore any message from udevsend that contains a
786 SEQNUM, to avoid duplicate events. The forked events can be disabled
788 echo "" > /proc/sys/kernel/hotplug
789 For full support, the broken input-subsytem needs to be fixed, not to
790 bypass the driver core.
792 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
793 removed from udev itself and must be emulated by calling small
794 helper binaries provided in the extras folder:
795 make EXTRAS=extras/run_directory/
796 will build udev_run_devd and udev_run_hotplugd, which can be called
797 from a rule if needed:
798 RUN+="/sbin/udev_run_hotplugd"
799 The recommended way to handle this is to convert all the calls from
800 the directories to explicit udev rules and get completely rid of the
801 multiplexing. (To catch a ttyUSB event, you now no longer need to
802 fork and exit 300 tty script instances you are not interested in, it
803 is just one rule that matches exactly the device.)
805 o udev handles now _all_ events not just events for class and block
806 devices, this way it is possible to control the complete event
807 behavior with udev rules. Especially useful for rules like:
808 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
810 o As used in the modalias rule, udev supports now textual
811 substitution placeholder along with the usual format chars. This
812 needs to be documented, for now it's only visible in udev_rules_parse.c.
814 o The rule keys support now more operations. This is documented in the
815 man page. It is possible to add values to list-keys like the SYMLINK
816 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
817 Also "final"-assignments are supported by using KEY:="value", which will
818 prevent changing the key by any later rule.
820 o kernel 2.6.12 has the "detached_state" attribute removed from
821 sysfs, which was used to recognize sysfs population. We switched that
822 to wait for the "bus" link, which is only available in kernels after 2.6.11.
823 Running this udev version on older kernels may cause a short delay for
826 o To provide infrastructure for persistent device naming, the id programs:
827 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
828 to export the probed data in environment key format:
829 pim:~ # /sbin/ata_id --export /dev/hda
830 ID_MODEL=HTS726060M9AT00
831 ID_SERIAL=MRH401M4G6UM9B
835 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
836 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
839 kay@pim:~> tree /dev/disk
842 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
843 | `-- IBM-Memory_Key -> ../../sda
845 | |-- swap -> ../../hda1
846 | |-- date -> ../../sda1
847 | `-- home -> ../../hda3
849 |-- 2E08712B0870F2E7 -> ../../hda3
850 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
851 |-- E845-7A89 -> ../../sda1
852 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
854 The IMPORT= operation will import these keys in the environment and make
855 it available for later PROGRAM= and RUN= executed programs. The keys are
856 also stored in the udevdb and can be queried from there with one of the
859 o A few binaries are silently added to the repository, which can be used
860 to replay kernel events from initramfs instead of using coldplug. udevd
861 can be instructed now to queue-up events while the stored events from
862 initramfs are filled into the udevd-queue. This code is still under
863 development and there is no documentation now besides the code itself.
864 The additional binaries get compiled, but are not installed by default.
866 o There is also a temporary fix for a performance problem where too many
867 events happen in parallel and every event needs to parse the rules.
868 udev can now read precompiled rules stored on disk. This is likely to be
869 replaced by a more elegant solution in a future udev version.
873 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
874 Fix for libsysfs not to expect this file was added.
878 All rules are applied now, but only the first matching rule with a NAME-key
879 will be applied. All later rules with NAME-key are completely ignored. This
880 way system supplied symlinks or permissions gets applied to user-defined
884 Please check your rules setup, if you may need to add OPTIONS="last_rule"
885 to some rules, to keep the old behavior.
887 The rules are read on "remove"-events too. That makes is possible to match
888 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
889 instruct udev to ignore an event (OPTIONS="ignore_device").
890 The new ACTION-key may be used to let a rule act only at a "remove"-event.
892 The new RUN-key supports rule-based execution of programs after device-node
893 handling. This is meant as a general replacement for the dev.d/-directories
894 to give fine grained control over the execution of programs.
896 The %s{}-sysfs format char replacement values are searched at any of the
897 devices in the device chain now, not only at the class-device.
899 We support log priority levels now. The value udev_log in udev.conf is used
900 to determine what is printed to syslog. This makes it possible to
901 run a version with compiled-in debug messages in a production environment
902 which is sometimes needed to find a bug.
903 It is still possible to supress the inclusion of _any_ syslog usage with
904 USE_LOG=false to create the smallest possible binaries if needed.
905 The configured udev_log value can be overridden with the environment variable
910 Possible use of a system-wide klibc:
911 make USE_KLIBC=true KLCC=/usr/bin/klcc all
912 will link against an external klibc and our own version will be ignored.
916 We support an unlimited count of symlinks now.
918 If USE_STATIC=true is passed to a glibc build, we link statically and use
919 a built-in userdb parser to resolve user and group names.
921 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
922 we walk up the chain of physical devices to find a match.
924 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
925 easy to skip certain attribute matches without composing rules with weird
926 character class negations like:
927 KERNEL="[!s][!c][!d]*"
928 this can now be replaced with:
930 The current simple '=' is still supported, and should work as it does today,
931 but existing rules should be converted if possible, to be better readable.
933 We have new ENV{}== key now, to match against a maximum of 5 environment
936 udevstart is its own binary again, because we don't need co carry this araound
937 with every forked event.
~ianmdlvl / elogind.git / blob