5 Optical drive's media is no longer probed for raid signatures,
6 reading the end of the device causes some devices to malfunction.
7 Also the offset of the last session found is used now to probe
10 The volume_id library got a major version number update to 1,
11 some deprecated functions are removed.
13 A shared library "libudev" gets installed now to provide access
14 to udev device information. DeviceKit, the successor of HAL, will
15 need this library to access the udev database and search sysfs for
17 The library is currently in an experimental state, also the API is
18 expected to change, as long as the DeviceKit integration is not
23 We use ./configure now. See INSTALL for details. Current
26 "/usr" - prefix for man pages, include files
28 "" - the root filesystem, prefix for libs and binaries
32 "lib" - directory name for libraries, not a path name
33 multilib 64bit systems may use "lib64" instead of "lib"
35 compile-in verbose debug messages
37 disable all logging and compile-out all log strings
39 link against SELInux libraries, to set the expected context
42 In the default rules, the group "disk" gets permissions 0660 instead
43 of 0640. One small step closer to unify distro rules. Some day, all
44 distros hopefully end up with the same set of rules.
46 No symlinks to udevadm are installed anymore, if they are still needed,
47 they should be provided by the package.
53 Default udev rules, which are not supposed to be edited by the user, should
54 be placed in /lib/udev/rules.d/ now, to make it clear that they are private to
55 the udev package and will be replaced with an update. Udev will pick up rule
57 /lib/udev/rules.d/ - default installed rules
58 /etc/udev/rules.d/ - user rules + on-the-fly generated rules
59 /dev/.udev/rules.d/ - temporary non-persistent rules created after bootup
60 It does not matter in which directory a rule file lives, all files are sorted
63 To help creating /dev/root, we have now:
64 $ udevadm info --export --export-prefix="ROOT_" --device-id-of-file=/
67 In case the current --device-id-of-file is already used, please switch to
68 the --export format version, it saves the output parsing and the old
69 format will be changed to use ':' as a separator, like the format in the
74 Fix cdrom_id to properly recognize blank media.
80 Tape drive id-data is queried from /dev/bsg/* instead of the tape
81 nodes. This avoids rewinding tapes on open().
87 The symlinks udevcontrol and udevtrigger are no longer installed by
90 The scsi_id program does not depend on sysfs anymore. It can speak
91 SGv4 now, so /dev/bsg/* device nodes can be used, to query SCSI device
92 data, which should solve some old problems with tape devices, where
93 we better do not open all tape device nodes to identify the device.
99 The cdrom_id program is replaced by an advanced version, which can
100 detect most common device types, and also properties of the inserted
101 media. This is part of moving some basic functionality from HAL into
102 udev (and the kernel).
108 The last WAIT_FOR_SYSFS rule is removed from the default rules.
110 The symlinks to udevadm for the debugging tools: udevmonitor and
111 udevtest are no longer created.
113 The symlinks to the udevadm man page for the old tool names are
116 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
117 should be prefixed with '@' to indicate that the path is not a
128 Udevstart is removed from the tree, it did not get installed for
129 a long time now, and is long replaced by trigger and settle.
135 All udev tools are merged into a single binary called udevadm.
136 The old names of the tools are built-in commands in udevadm now.
137 Symlinks to udevadm, with the names of the old tools, provide
138 the same functionality as the standalone tools. There is also
139 only a single udevadm.8 man page left for all tools.
141 Tools like mkinitramfs should be checked, if they need to include
142 udevadm in the list of files.
152 The etc/udev/rules.d/ directory now contains a default set of basic
153 udev rules. This initial version is the result of a rules file merge
154 of Fedora and openSUSE. For these both distros only a few specific
155 rules are left in their own file, named after the distro. Rules which
156 are optionally installed, because they are only valid for a specific
157 architecture, or rules for subsystems which are not always used are
158 in etc/udev/packages/.
164 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
165 actions by dynamically created rules.
167 SYMLINK=="<value>" matches agains the entries in the list of
168 currently defined symlinks. The links are not created in the
169 filesystem at that point in time, but the values can be matched.
171 RUN{ignore_error}+="<program>" will ignore any exit code from the
172 program and not record as a failed event.
178 Final merge of patches/features from the Ubuntu package.
184 Control characters in filesystem label strings are no longer silenty
185 removed, but hex-encoded, to be able to uniquely identify the device
186 by its symlink in /dev/disk/by-label/.
187 If libvolume_id is used by mount(8), LABEL= will work as expected,
188 if slashes or other characters are used in the label string.
190 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
191 can be specified now. The TEST key accepts an optional mode mask
192 TEST{0100}=="<is executable file>".
194 Scsi_id now supports a mode without expecting scsi-specific sysfs
195 entries to allow the extraction of cciss-device persistent properties.
201 In the future, we may see uuid's which are just simple character
202 strings (see the DDF Raid Specification). For that reason vol_id now
203 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
204 the creation of symlinks, the *_SAFE values ensure, that no control
205 or whitespace characters are used in the filename.
207 Possible users of libvolume_id, please use the volume_id_get_* functions.
208 The public struct will go away in a future release of the library.
214 Removal of useless extras/eventrecorder.sh.
224 The directory multiplexer for dev.d/ and hotplug.d are finally removed
225 from the udev package.
231 Symlinks can have priorities now, the priority is assigned to the device
232 and specified with OPTIONS="link_priority=100". Devices with higher
233 priorities overwrite the symlinks of devices with lower priorities.
234 If the device that currently owns the link, goes away, the symlink
235 will be removed, and recreated, pointing to the next device with the
236 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
237 more reliable, if multiple devices contain the same metadata and overwrite
240 The dasd_id program is removed from the udev tree, and dasdinfo, with the
241 needed rules, are part of the s390-tools now.
243 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
244 we may get the scsi sysfs mess fixed some day, and this will only catch
245 the devices we are looking for.
247 USB serial numbers for storage devices have the target:lun now appended,
248 to make it possibble to distinguish broken multi-lun devices with all
249 the same SCSI identifiers.
251 Note: The extra "run_directory" which searches and executes stuff in
252 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
253 with the next release. Make sure, that you don't use it anymore, or
254 provides your own implementation of that inefficient stuff.
255 We are tired of reports about a "slow udev", because these directories
256 contain stuff, that runs with _every_ event, instead of using rules,
257 that run programs only for the matching events.
267 DRIVER== will match only for devices that actually have a real
268 driver. DRIVERS== must be used, if parent devices should be
269 included in the match.
271 Libvolume_id's "linux_raid" detection needed another fix.
279 Add additional check to volume_id detection of via_raid, cause
280 some company decided to put a matching pattern all over the empty
281 storage area of their music players.
285 Fix path_id for SAS devices.
289 The udev daemon can be started with --debug-trace now, which will
290 execute all events serialized to get a chance to catch a possible
291 action that crashes the box.
293 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
294 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
295 are excluded from the warning. Referencing parent attributes directly
296 may break when something in the kernel driver model changes. Udev will
297 just find the attribute by walking up the parent chain.
299 Udevtrigger now sorts the list of devices depending on the device
300 dependency, so a "usb" device is triggered after the parent "pci"
305 Revert persistent-storage ata-serial '_' '-' replacement.
311 Udevtrigger can now filter the list of devices to be triggered. Matches
312 for subsystems or sysfs attributes can be specified.
314 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
315 zero-sized files to avoid pointing to /sys and confuse broken tools which
316 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
319 The rules and scripts to create udev rules for persistent network
320 devices and optical drives are in the extras/rules_generator directory
321 now. If you use something similar, please consider replacing your own
322 version with this, to share the support effort. The rule_generator
323 installs its own rules into /etc/udev/rules.d.
325 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
326 the rule_generator depends on cdrom_id to be called in an earlier rule.
332 Renaming of some key names (the old names still work):
333 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
334 (The behavior of the key DRIVER will change soon in one of the next
335 releases, to match only the event device, please switch to DRIVERS
336 instead. If DRIVER is used, it will behave like DRIVERS, but an error
338 With the new key names, we have a more consistent and simpler scheme.
339 We can match the properties of the event device only, with: KERNEL,
340 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
341 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
342 longer mentioned in the man page and should be switched in the rule
345 ATTR{file}="value" can be used now, to write to a sysfs file of the
346 event device. Instead of:
347 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
349 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
351 All the PHYSDEV* keys are deprecated and will be removed from a
353 PHYDEVPATH - is the path of a parent device and should not be
355 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
356 matched with SUBSYSTEMS==
357 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
358 Newer kernels will have DRIVER in the environment,
359 for older kernels udev puts in. Class device will
360 no longer carry this property of a parent and
361 DRIVERS== can be used to match such a parent value.
362 Note that ENV{DRIVER} is only available for a few bus devices, where
363 the driver is already bound at device event time. On coldplug, the
364 events for a lot devices are already bound to a driver, and they will have
365 that value set. But on hotplug, at the time the kernel creates the device,
366 it can't know what driver may claim the device after that, therefore
367 in most cases it will be empty.
369 Failed events should now be re-triggered with:
370 udevtrigger --retry-failed.
371 Please switch to this command, so we keep the details of the /dev/.udev/failed/
372 files private to the udev tools. We may need to switch the current symlink
373 target, cause some obviously broken tools try to scan all files in /dev
374 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
375 million times. This takes ages on slow boxes.
377 The udevinfo attribute walk (-a) now works with giving a device node
378 name (-n) instead of a devpath (-p). The query now always works, also when
379 no database file was created by udev.
381 The built-in /etc/passwd /etc/group parser is removed, we always depend on
382 getpwnam() and getgrnam() now. One of the next releases will depend on
383 fnmatch() and may use getopt_long().
387 Bugfixes and small improvements.
391 Fix path_id for recent kernels.
397 Added support for swapping network interface names, by temporarily
398 renaming the device and wait for the target name to become free.
402 The built-in MODALIAS key and substitution is removed.
406 The binary firmware helper is replaced by the usual simple
407 shell script. Udevsend is removed from the tree.
415 Some more keys require the correct use of '==' and '=' depending
416 on the kind of operation beeing an assignment or a match. Rules
417 with invalid operations are skipped and logged to syslog. Please
418 test with udevtest if the parsing of your rules throws errors and
419 fix possibly broken rules.
423 Provide "udevsettle" to wait for all current udev events to finish.
424 It also watches the current kernel netlink queue by comparing the
425 even sequence number to make sure that there are no current pending
426 events that have not already arrived in the daemon.
430 Fix rule to skip persistent rules for removable IDE devices, which
431 also skipped optical IDE drives.
433 All *_id program are installed in /lib/udev/ by default now.
435 No binary is stripped anymore as this should be done in the
436 packaging process and not at build time.
438 libvolume_id is provided as a shared library now and vol_id is
439 linked against it. Also one of the next HAL versions will require
440 this library, and the HAL build process will also require the
441 header file to be installed. The copy of the same code in HAL will
442 be removed to have only a single copy left on the system.
446 Add persistent links for SCSI tapes. The rules file is renamed
447 to 60-persistent-storage.rules.
449 Create persistent path for usb devices. Can be used for all sorts
450 of devices that can't be distinguished by other properties like
451 multiple identical keyboards and mice connected to the same box.
453 Provide "udevtrigger" program to request events on coldplug. The
454 shell script is much too slow with thousends of devices.
458 Fix persistent disk rules to exclude removable IDE drives.
460 Warn if %e, $modalias or MODALIAS is used.
464 Fix queue export, which wasn't correct for subsequent add/remove
465 events for the same device.
469 Fix cramfs detection on big endian.
471 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
476 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
477 attributes were only checked at the parent device that matched the
478 by BUS requested subsystem. Fix it to also look at the device we
479 received the event for.
481 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
486 Fix a bug where NAME="" would prevent RUN from beeing executed.
488 RUN="/bin/program" does not longer automatically add the subsystem
489 as the first parameter. This is from the days of /sbin/hotplug
490 which is dead now and it's just confusing to need to add a space at
491 the end of the program name to prevent this.
492 If you use rules that need the subsystem as the first parameter,
493 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
494 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
498 The udev man page has moved to udev(7) as it does not describe a command
499 anymore. The programs udev, udevstart and udevsend are no longer installed
500 by default and must be copied manually, if they should be installed or
501 included in a package.
503 Fix a bug where "ignore_device" could run earlier collected RUN keys before
504 the ignore rule was applied.
506 More preparation for future sysfs changes. usb_id and scsi_id no longer
507 depend on a magic order of devices in the /devices chain. Specific devices
508 should be requested by their subsytem.
510 This will always find the scsi parent device without depending on a specific
512 dev = sysfs_device_get(devpath);
513 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
515 The "device" link in the current sysfs layout will be automatically
516 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
517 parent in the devpath. If a device is requested by it's symlink, like all
518 class devices in the new sysfs layout will look like, it gets automatically
519 resolved and substituted with the real devpath and not the symlink path.
522 A similar logic must be applied to _all_ sysfs users, including
523 scripts, that search along parent devices in sysfs. The explicit use of
524 the "device" link must be avoided. With the future sysfs layout all
525 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
526 back to the "class" or the "bus". The layout of the parent devices in
527 /devices is not necessarily expected to be stable across kernel releases and
528 searching for parents by their subsystem should make sysfs users tolerant
529 for changed parent chains.
533 Prepare udev to work with the experimental kernel patch, that moves
534 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
536 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
537 moving the class devices to /sys/devices.
539 Thanks again to Marco for help finding a hopefully nice compromise
540 to make %b simpler and working again.
544 Complete removal of libsysfs, replaced by simple helper functions
545 which are much simpler and a bit faster. The udev daemon operatesentirely
546 on event parameters and does not use sysfs for simple rules anymore.
547 Please report any new bugs/problems, that may be caused by this big
548 change. They will be fixed immediately.
550 The enumeration format character '%e' is deprecated and will be
551 removed sometimes from a future udev version. It never worked correctly
552 outside of udevstart, so we can't use it with the new parallel
553 coldplug. A simple enumeration is as useless as the devfs naming
554 scheme, just get rid of both if you still use it.
556 MODALIAS and $modalias is not needed and will be removed from one of
557 the next udev versions, replace it in all rules with ENV{MODALIAS} or
558 the sysfs "modalias" value.
560 Thanks a lot to Marco for all his help on finding and fixing bugs.
564 Let scsi_id request libata drive serial numbers from page 0x80.
566 Renamed etc/udev/persistent.rules to persistent-disk.rules and
567 added /dev/disk/by-name/* for device mapper device names.
569 Removed %e from the man page. It never worked reliably outside
570 of udevstart and udevstart is no longer recommended to use.
574 Symlinks are now exported to the event environment. Hopefully it's no
575 longer needed to run udevinfo from an event process, like it was
576 mentioned on the hotplug list:
577 UDEV [1134776873.702967] add@/block/sdb
580 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
584 Fix a problem if udevsend is used as the hotplug handler and tries to use
585 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
586 and this kind of problems will hopefully go away soon.
590 All built-in logic to work around bad sysfs timing is removed with this
591 version. The need to wait for sysfs files is almost fixed with a kernel
592 version that doesn't work with this udev version anyway. Until we fix
593 the timing of the "bus" link creation, the former integrated logic should
594 be emulated by a rule placed before all other rules:
595 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
597 The option "udev_db" does no longer exist. All udev state will be in
598 /$udev_root/.udev/ now, there is no longer an option to set this
600 If the init script or something else used this value, just depend on
601 this hardcoded path. But remember _all_content_ of this directory is
602 still private to udev and can change at any time.
604 Default location for rule sripts and helper programs is now: /lib/udev/.
605 Everything that is not useful on the commandline should go into this
606 directory. Some of the helpers in the extras folder are installed there
607 now. The rules need to be changed, to find the helpers there.
609 Also /lib/udev/devices is recommended as a directory where packages or
610 the user can place real device nodes, which get copied over to /dev at
611 every boot. This should replace the various solutions with custom config
614 Udevsend does no longer start the udev daemon. This must be done with
615 the init script that prepares /dev on tmpfs and creates the initial nodes,
616 before starting the daemon.
620 Silent a too verbose error logging for the old hotplug.d/ dev.d/
623 The copy of klibc is removed. A systemwide installed version of klibc
624 should be used to build a klibc udev now.
628 NAME="" will not create any nodes, but execute RUN keys. To completely
629 ignore an event the OPTION "ignore_device" should be used.
631 After removal of the reorder queue, events with a TIMEOUT can be executed
632 without any queuing now.
636 Fixed bug in udevd, if inotify is not available. We depend on netlink
637 uevents now, kernels without that event source will not work with that
638 version of udev anymore.
642 The rule parsing happens now in the daemon once at startup, all udev
643 event processes inherit the already parsed rules from the daemon.
644 It is shipped with SUSE10.0 and reduces heavily the system load at
645 startup. The option to save precompiled rules and let the udev process
646 pick the them up is removed, as it's no longer needed.
648 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
649 device. Libsysfs is changed to "translate" the requested link into the
650 real device path, as it would happen with the hotplug event. Otherwise
651 device removal and the udev database will not work.
653 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
656 A few improvements for vol_id, the filesytem probing code.
660 Fix a stupid typo in extras/run_directory for "make install".
662 scsi_id creates the temporary devnode now in /dev for usage with a
663 non-writable /tmp directory.
665 The uevent kernel socket buffer can carry app. 50.000 events now,
666 let's see who can break this again. :)
668 The upcoming kernel will have a new input driver core integration.
669 Some class devices are now symlinks to the real device. libsysfs
670 needs a fix for this to work correctly. Udevstart of older udev
671 versions will _not_ create these devices!
675 Fix a 'install' target in the Makefile, that prevents EXTRAS from
680 A bunch of mostly trivial bugfixes. From now on no node name or
681 symlink name can contain any character than plain whitelisted ascii
682 characters or validated utf8 byte-streams. This is needed for the
683 /dev/disk/by-label/* links, because we import untrusted data and
684 export it to the filesystem.
688 More bugfixes. If udevd was started from the kernel, we don't
689 have stdin/stdout/stderr, which broke the forked tools in some
694 Bugfix. udevstart event ordering was broken for a long time.
695 The new run_program() uncovered it, because /dev/null was not
696 available while we try to run external programs.
697 Now udevstart should create it before we run anything.
701 Minor bugfixes and some distro rules updates. If you don't have the
702 persistent disk rules in /dev/disk/by-*/* on your distro, just
703 grab it from here. :)
707 We can use socket communication now to pass events from udev to
709 RUN+="socket:/org/freedesktop/hal/udev_event"
710 will pass the whole udev event to the HAL daemon without the need
711 for a forked helper. (See ChangeLog for udevmonitor, as an example)
715 Mostly bugfixes and see ChangeLog.
717 The test for the existence of an environment value should be
719 ENV{KEY}=="*" to ENV{KEY}=="?*"
720 because "*" will not fail anymore, if the key does not exist or
725 Bugfixes and a few tweaks described in the ChangeLog.
729 Mostly a Bugfix release.
731 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
732 timing with custom rules.
736 We changed the internal rule storage format. Our large rule files took
737 2 MB of RAM, with the change we are down to 99kB.
739 If the device-node has been created with default name and no symlink or
740 options are to remenber, it is not longer stored in the udevdb. HAL will
741 need to be updated to work correctly with that change.
743 To overrride optimization flags, OPTFLAGS may be used now.
751 Major changes happened with this release. The goal is to take over the
752 complete kernel-event handling and provide a more efficient way to dispatch
753 kernel events. Replacing most of the current shell script logic and the
754 kernel forked helper with a netlink-daemon and a rule-based event handling.
756 o udevd listens to netlink events now. The first valid netlink event
757 will make udevd ignore any message from udevsend that contains a
758 SEQNUM, to avoid duplicate events. The forked events can be disabled
760 echo "" > /proc/sys/kernel/hotplug
761 For full support, the broken input-subsytem needs to be fixed, not to
762 bypass the driver core.
764 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
765 removed from udev itself and must be emulated by calling small
766 helper binaries provided in the extras folder:
767 make EXTRAS=extras/run_directory/
768 will build udev_run_devd and udev_run_hotplugd, which can be called
769 from a rule if needed:
770 RUN+="/sbin/udev_run_hotplugd"
771 The recommended way to handle this is to convert all the calls from
772 the directories to explicit udev rules and get completely rid of the
773 multiplexing. (To catch a ttyUSB event, you now no longer need to
774 fork and exit 300 tty script instances you are not interested in, it
775 is just one rule that matches exactly the device.)
777 o udev handles now _all_ events not just events for class and block
778 devices, this way it is possible to control the complete event
779 behavior with udev rules. Especially useful for rules like:
780 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
782 o As used in the modalias rule, udev supports now textual
783 substitution placeholder along with the usual format chars. This
784 needs to be documented, for now it's only visible in udev_rules_parse.c.
786 o The rule keys support now more operations. This is documented in the
787 man page. It is possible to add values to list-keys like the SYMLINK
788 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
789 Also "final"-assignments are supported by using KEY:="value", which will
790 prevent changing the key by any later rule.
792 o kernel 2.6.12 has the "detached_state" attribute removed from
793 sysfs, which was used to recognize sysfs population. We switched that
794 to wait for the "bus" link, which is only available in kernels after 2.6.11.
795 Running this udev version on older kernels may cause a short delay for
798 o To provide infrastructure for persistent device naming, the id programs:
799 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
800 to export the probed data in environment key format:
801 pim:~ # /sbin/ata_id --export /dev/hda
802 ID_MODEL=HTS726060M9AT00
803 ID_SERIAL=MRH401M4G6UM9B
807 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
808 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
811 kay@pim:~> tree /dev/disk
814 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
815 | `-- IBM-Memory_Key -> ../../sda
817 | |-- swap -> ../../hda1
818 | |-- date -> ../../sda1
819 | `-- home -> ../../hda3
821 |-- 2E08712B0870F2E7 -> ../../hda3
822 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
823 |-- E845-7A89 -> ../../sda1
824 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
826 The IMPORT= operation will import these keys in the environment and make
827 it available for later PROGRAM= and RUN= executed programs. The keys are
828 also stored in the udevdb and can be queried from there with one of the
831 o A few binaries are silently added to the repository, which can be used
832 to replay kernel events from initramfs instead of using coldplug. udevd
833 can be instructed now to queue-up events while the stored events from
834 initramfs are filled into the udevd-queue. This code is still under
835 development and there is no documentation now besides the code itself.
836 The additional binaries get compiled, but are not installed by default.
838 o There is also a temporary fix for a performance problem where too many
839 events happen in parallel and every event needs to parse the rules.
840 udev can now read precompiled rules stored on disk. This is likely to be
841 replaced by a more elegant solution in a future udev version.
845 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
846 Fix for libsysfs not to expect this file was added.
850 All rules are applied now, but only the first matching rule with a NAME-key
851 will be applied. All later rules with NAME-key are completely ignored. This
852 way system supplied symlinks or permissions gets applied to user-defined
856 Please check your rules setup, if you may need to add OPTIONS="last_rule"
857 to some rules, to keep the old behavior.
859 The rules are read on "remove"-events too. That makes is possible to match
860 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
861 instruct udev to ignore an event (OPTIONS="ignore_device").
862 The new ACTION-key may be used to let a rule act only at a "remove"-event.
864 The new RUN-key supports rule-based execution of programs after device-node
865 handling. This is meant as a general replacement for the dev.d/-directories
866 to give fine grained control over the execution of programs.
868 The %s{}-sysfs format char replacement values are searched at any of the
869 devices in the device chain now, not only at the class-device.
871 We support log priority levels now. The value udev_log in udev.conf is used
872 to determine what is printed to syslog. This makes it possible to
873 run a version with compiled-in debug messages in a production environment
874 which is sometimes needed to find a bug.
875 It is still possible to supress the inclusion of _any_ syslog usage with
876 USE_LOG=false to create the smallest possible binaries if needed.
877 The configured udev_log value can be overridden with the environment variable
882 Possible use of a system-wide klibc:
883 make USE_KLIBC=true KLCC=/usr/bin/klcc all
884 will link against an external klibc and our own version will be ignored.
888 We support an unlimited count of symlinks now.
890 If USE_STATIC=true is passed to a glibc build, we link statically and use
891 a built-in userdb parser to resolve user and group names.
893 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
894 we walk up the chain of physical devices to find a match.
896 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
897 easy to skip certain attribute matches without composing rules with weird
898 character class negations like:
899 KERNEL="[!s][!c][!d]*"
900 this can now be replaced with:
902 The current simple '=' is still supported, and should work as it does today,
903 but existing rules should be converted if possible, to be better readable.
905 We have new ENV{}== key now, to match against a maximum of 5 environment
908 udevstart is its own binary again, because we don't need co carry this araound
909 with every forked event.
~ianmdlvl / elogind.git / blob