3 Fix cdrom_id to properly recognize blank media.
9 Tape drive id-data is queried from /dev/bsg/* instead of the tape
10 nodes. This avoids rewinding tapes on open().
16 The symlinks udevcontrol and udevtrigger are no longer installed by
19 The scsi_id program does not depend on sysfs anymore. It can speak
20 SGv4 now, so /dev/bsg/* device nodes can be used, to query SCSI device
21 data, which should solve some old problems with tape devices, where
22 we better do not open all tape device nodes to identify the device.
28 The cdrom_id program is replaced by an advanced version, which can
29 detect most common device types, and also properties of the inserted
30 media. This is part of moving some basic functionality from HAL into
31 udev (and the kernel).
37 The last WAIT_FOR_SYSFS rule is removed from the default rules.
39 The symlinks to udevadm for the debugging tools: udevmonitor and
40 udevtest are no longer created.
42 The symlinks to the udevadm man page for the old tool names are
45 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
46 should be prefixed with '@' to indicate that the path is not a
57 Udevstart is removed from the tree, it did not get installed for
58 a long time now, and is long replaced by trigger and settle.
64 All udev tools are merged into a single binary called udevadm.
65 The old names of the tools are built-in commands in udevadm now.
66 Symlinks to udevadm, with the names of the old tools, provide
67 the same functionality as the standalone tools. There is also
68 only a single udevadm.8 man page left for all tools.
70 Tools like mkinitramfs should be checked, if they need to include
71 udevadm in the list of files.
81 The etc/udev/rules.d/ directory now contains a default set of basic
82 udev rules. This initial version is the result of a rules file merge
83 of Fedora and openSUSE. For these both distros only a few specific
84 rules are left in their own file, named after the distro. Rules which
85 are optionally installed, because they are only valid for a specific
86 architecture, or rules for subsystems which are not always used are
87 in etc/udev/packages/.
93 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
94 actions by dynamically created rules.
96 SYMLINK=="<value>" matches agains the entries in the list of
97 currently defined symlinks. The links are not created in the
98 filesystem at that point in time, but the values can be matched.
100 RUN{ignore_error}+="<program>" will ignore any exit code from the
101 program and not record as a failed event.
107 Final merge of patches/features from the Ubuntu package.
113 Control characters in filesystem label strings are no longer silenty
114 removed, but hex-encoded, to be able to uniquely identify the device
115 by its symlink in /dev/disk/by-label/.
116 If libvolume_id is used by mount(8), LABEL= will work as expected,
117 if slashes or other characters are used in the label string.
119 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
120 can be specified now. The TEST key accepts an optional mode mask
121 TEST{0100}=="<is executable file>".
123 Scsi_id now supports a mode without expecting scsi-specific sysfs
124 entries to allow the extraction of cciss-device persistent properties.
130 In the future, we may see uuid's which are just simple character
131 strings (see the DDF Raid Specification). For that reason vol_id now
132 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
133 the creation of symlinks, the *_SAFE values ensure, that no control
134 or whitespace characters are used in the filename.
136 Possible users of libvolume_id, please use the volume_id_get_* functions.
137 The public struct will go away in a future release of the library.
143 Removal of useless extras/eventrecorder.sh.
153 The directory multiplexer for dev.d/ and hotplug.d are finally removed
154 from the udev package.
160 Symlinks can have priorities now, the priority is assigned to the device
161 and specified with OPTIONS="link_priority=100". Devices with higher
162 priorities overwrite the symlinks of devices with lower priorities.
163 If the device that currently owns the link, goes away, the symlink
164 will be removed, and recreated, pointing to the next device with the
165 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
166 more reliable, if multiple devices contain the same metadata and overwrite
169 The dasd_id program is removed from the udev tree, and dasdinfo, with the
170 needed rules, are part of the s390-tools now.
172 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
173 we may get the scsi sysfs mess fixed some day, and this will only catch
174 the devices we are looking for.
176 USB serial numbers for storage devices have the target:lun now appended,
177 to make it possibble to distinguish broken multi-lun devices with all
178 the same SCSI identifiers.
180 Note: The extra "run_directory" which searches and executes stuff in
181 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
182 with the next release. Make sure, that you don't use it anymore, or
183 provides your own implementation of that inefficient stuff.
184 We are tired of reports about a "slow udev", because these directories
185 contain stuff, that runs with _every_ event, instead of using rules,
186 that run programs only for the matching events.
196 DRIVER== will match only for devices that actually have a real
197 driver. DRIVERS== must be used, if parent devices should be
198 included in the match.
200 Libvolume_id's "linux_raid" detection needed another fix.
208 Add additional check to volume_id detection of via_raid, cause
209 some company decided to put a matching pattern all over the empty
210 storage area of their music players.
214 Fix path_id for SAS devices.
218 The udev daemon can be started with --debug-trace now, which will
219 execute all events serialized to get a chance to catch a possible
220 action that crashes the box.
222 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
223 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
224 are excluded from the warning. Referencing parent attributes directly
225 may break when something in the kernel driver model changes. Udev will
226 just find the attribute by walking up the parent chain.
228 Udevtrigger now sorts the list of devices depending on the device
229 dependency, so a "usb" device is triggered after the parent "pci"
234 Revert persistent-storage ata-serial '_' '-' replacement.
240 Udevtrigger can now filter the list of devices to be triggered. Matches
241 for subsystems or sysfs attributes can be specified.
243 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
244 zero-sized files to avoid pointing to /sys and confuse broken tools which
245 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
248 The rules and scripts to create udev rules for persistent network
249 devices and optical drives are in the extras/rules_generator directory
250 now. If you use something similar, please consider replacing your own
251 version with this, to share the support effort. The rule_generator
252 installs its own rules into /etc/udev/rules.d.
254 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
255 the rule_generator depends on cdrom_id to be called in an earlier rule.
261 Renaming of some key names (the old names still work):
262 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
263 (The behavior of the key DRIVER will change soon in one of the next
264 releases, to match only the event device, please switch to DRIVERS
265 instead. If DRIVER is used, it will behave like DRIVERS, but an error
267 With the new key names, we have a more consistent and simpler scheme.
268 We can match the properties of the event device only, with: KERNEL,
269 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
270 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
271 longer mentioned in the man page and should be switched in the rule
274 ATTR{file}="value" can be used now, to write to a sysfs file of the
275 event device. Instead of:
276 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
278 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
280 All the PHYSDEV* keys are deprecated and will be removed from a
282 PHYDEVPATH - is the path of a parent device and should not be
284 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
285 matched with SUBSYSTEMS==
286 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
287 Newer kernels will have DRIVER in the environment,
288 for older kernels udev puts in. Class device will
289 no longer carry this property of a parent and
290 DRIVERS== can be used to match such a parent value.
291 Note that ENV{DRIVER} is only available for a few bus devices, where
292 the driver is already bound at device event time. On coldplug, the
293 events for a lot devices are already bound to a driver, and they will have
294 that value set. But on hotplug, at the time the kernel creates the device,
295 it can't know what driver may claim the device after that, therefore
296 in most cases it will be empty.
298 Failed events should now be re-triggered with:
299 udevtrigger --retry-failed.
300 Please switch to this command, so we keep the details of the /dev/.udev/failed/
301 files private to the udev tools. We may need to switch the current symlink
302 target, cause some obviously broken tools try to scan all files in /dev
303 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
304 million times. This takes ages on slow boxes.
306 The udevinfo attribute walk (-a) now works with giving a device node
307 name (-n) instead of a devpath (-p). The query now always works, also when
308 no database file was created by udev.
310 The built-in /etc/passwd /etc/group parser is removed, we always depend on
311 getpwnam() and getgrnam() now. One of the next releases will depend on
312 fnmatch() and may use getopt_long().
316 Bugfixes and small improvements.
320 Fix path_id for recent kernels.
326 Added support for swapping network interface names, by temporarily
327 renaming the device and wait for the target name to become free.
331 The built-in MODALIAS key and substitution is removed.
335 The binary firmware helper is replaced by the usual simple
336 shell script. Udevsend is removed from the tree.
344 Some more keys require the correct use of '==' and '=' depending
345 on the kind of operation beeing an assignment or a match. Rules
346 with invalid operations are skipped and logged to syslog. Please
347 test with udevtest if the parsing of your rules throws errors and
348 fix possibly broken rules.
352 Provide "udevsettle" to wait for all current udev events to finish.
353 It also watches the current kernel netlink queue by comparing the
354 even sequence number to make sure that there are no current pending
355 events that have not already arrived in the daemon.
359 Fix rule to skip persistent rules for removable IDE devices, which
360 also skipped optical IDE drives.
362 All *_id program are installed in /lib/udev/ by default now.
364 No binary is stripped anymore as this should be done in the
365 packaging process and not at build time.
367 libvolume_id is provided as a shared library now and vol_id is
368 linked against it. Also one of the next HAL versions will require
369 this library, and the HAL build process will also require the
370 header file to be installed. The copy of the same code in HAL will
371 be removed to have only a single copy left on the system.
375 Add persistent links for SCSI tapes. The rules file is renamed
376 to 60-persistent-storage.rules.
378 Create persistent path for usb devices. Can be used for all sorts
379 of devices that can't be distinguished by other properties like
380 multiple identical keyboards and mice connected to the same box.
382 Provide "udevtrigger" program to request events on coldplug. The
383 shell script is much too slow with thousends of devices.
387 Fix persistent disk rules to exclude removable IDE drives.
389 Warn if %e, $modalias or MODALIAS is used.
393 Fix queue export, which wasn't correct for subsequent add/remove
394 events for the same device.
398 Fix cramfs detection on big endian.
400 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
405 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
406 attributes were only checked at the parent device that matched the
407 by BUS requested subsystem. Fix it to also look at the device we
408 received the event for.
410 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
415 Fix a bug where NAME="" would prevent RUN from beeing executed.
417 RUN="/bin/program" does not longer automatically add the subsystem
418 as the first parameter. This is from the days of /sbin/hotplug
419 which is dead now and it's just confusing to need to add a space at
420 the end of the program name to prevent this.
421 If you use rules that need the subsystem as the first parameter,
422 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
423 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
427 The udev man page has moved to udev(7) as it does not describe a command
428 anymore. The programs udev, udevstart and udevsend are no longer installed
429 by default and must be copied manually, if they should be installed or
430 included in a package.
432 Fix a bug where "ignore_device" could run earlier collected RUN keys before
433 the ignore rule was applied.
435 More preparation for future sysfs changes. usb_id and scsi_id no longer
436 depend on a magic order of devices in the /devices chain. Specific devices
437 should be requested by their subsytem.
439 This will always find the scsi parent device without depending on a specific
441 dev = sysfs_device_get(devpath);
442 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
444 The "device" link in the current sysfs layout will be automatically
445 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
446 parent in the devpath. If a device is requested by it's symlink, like all
447 class devices in the new sysfs layout will look like, it gets automatically
448 resolved and substituted with the real devpath and not the symlink path.
451 A similar logic must be applied to _all_ sysfs users, including
452 scripts, that search along parent devices in sysfs. The explicit use of
453 the "device" link must be avoided. With the future sysfs layout all
454 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
455 back to the "class" or the "bus". The layout of the parent devices in
456 /devices is not necessarily expected to be stable across kernel releases and
457 searching for parents by their subsystem should make sysfs users tolerant
458 for changed parent chains.
462 Prepare udev to work with the experimental kernel patch, that moves
463 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
465 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
466 moving the class devices to /sys/devices.
468 Thanks again to Marco for help finding a hopefully nice compromise
469 to make %b simpler and working again.
473 Complete removal of libsysfs, replaced by simple helper functions
474 which are much simpler and a bit faster. The udev daemon operatesentirely
475 on event parameters and does not use sysfs for simple rules anymore.
476 Please report any new bugs/problems, that may be caused by this big
477 change. They will be fixed immediately.
479 The enumeration format character '%e' is deprecated and will be
480 removed sometimes from a future udev version. It never worked correctly
481 outside of udevstart, so we can't use it with the new parallel
482 coldplug. A simple enumeration is as useless as the devfs naming
483 scheme, just get rid of both if you still use it.
485 MODALIAS and $modalias is not needed and will be removed from one of
486 the next udev versions, replace it in all rules with ENV{MODALIAS} or
487 the sysfs "modalias" value.
489 Thanks a lot to Marco for all his help on finding and fixing bugs.
493 Let scsi_id request libata drive serial numbers from page 0x80.
495 Renamed etc/udev/persistent.rules to persistent-disk.rules and
496 added /dev/disk/by-name/* for device mapper device names.
498 Removed %e from the man page. It never worked reliably outside
499 of udevstart and udevstart is no longer recommended to use.
503 Symlinks are now exported to the event environment. Hopefully it's no
504 longer needed to run udevinfo from an event process, like it was
505 mentioned on the hotplug list:
506 UDEV [1134776873.702967] add@/block/sdb
509 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
513 Fix a problem if udevsend is used as the hotplug handler and tries to use
514 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
515 and this kind of problems will hopefully go away soon.
519 All built-in logic to work around bad sysfs timing is removed with this
520 version. The need to wait for sysfs files is almost fixed with a kernel
521 version that doesn't work with this udev version anyway. Until we fix
522 the timing of the "bus" link creation, the former integrated logic should
523 be emulated by a rule placed before all other rules:
524 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
526 The option "udev_db" does no longer exist. All udev state will be in
527 /$udev_root/.udev/ now, there is no longer an option to set this
529 If the init script or something else used this value, just depend on
530 this hardcoded path. But remember _all_content_ of this directory is
531 still private to udev and can change at any time.
533 Default location for rule sripts and helper programs is now: /lib/udev/.
534 Everything that is not useful on the commandline should go into this
535 directory. Some of the helpers in the extras folder are installed there
536 now. The rules need to be changed, to find the helpers there.
538 Also /lib/udev/devices is recommended as a directory where packages or
539 the user can place real device nodes, which get copied over to /dev at
540 every boot. This should replace the various solutions with custom config
543 Udevsend does no longer start the udev daemon. This must be done with
544 the init script that prepares /dev on tmpfs and creates the initial nodes,
545 before starting the daemon.
549 Silent a too verbose error logging for the old hotplug.d/ dev.d/
552 The copy of klibc is removed. A systemwide installed version of klibc
553 should be used to build a klibc udev now.
557 NAME="" will not create any nodes, but execute RUN keys. To completely
558 ignore an event the OPTION "ignore_device" should be used.
560 After removal of the reorder queue, events with a TIMEOUT can be executed
561 without any queuing now.
565 Fixed bug in udevd, if inotify is not available. We depend on netlink
566 uevents now, kernels without that event source will not work with that
567 version of udev anymore.
571 The rule parsing happens now in the daemon once at startup, all udev
572 event processes inherit the already parsed rules from the daemon.
573 It is shipped with SUSE10.0 and reduces heavily the system load at
574 startup. The option to save precompiled rules and let the udev process
575 pick the them up is removed, as it's no longer needed.
577 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
578 device. Libsysfs is changed to "translate" the requested link into the
579 real device path, as it would happen with the hotplug event. Otherwise
580 device removal and the udev database will not work.
582 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
585 A few improvements for vol_id, the filesytem probing code.
589 Fix a stupid typo in extras/run_directory for "make install".
591 scsi_id creates the temporary devnode now in /dev for usage with a
592 non-writable /tmp directory.
594 The uevent kernel socket buffer can carry app. 50.000 events now,
595 let's see who can break this again. :)
597 The upcoming kernel will have a new input driver core integration.
598 Some class devices are now symlinks to the real device. libsysfs
599 needs a fix for this to work correctly. Udevstart of older udev
600 versions will _not_ create these devices!
604 Fix a 'install' target in the Makefile, that prevents EXTRAS from
609 A bunch of mostly trivial bugfixes. From now on no node name or
610 symlink name can contain any character than plain whitelisted ascii
611 characters or validated utf8 byte-streams. This is needed for the
612 /dev/disk/by-label/* links, because we import untrusted data and
613 export it to the filesystem.
617 More bugfixes. If udevd was started from the kernel, we don't
618 have stdin/stdout/stderr, which broke the forked tools in some
623 Bugfix. udevstart event ordering was broken for a long time.
624 The new run_program() uncovered it, because /dev/null was not
625 available while we try to run external programs.
626 Now udevstart should create it before we run anything.
630 Minor bugfixes and some distro rules updates. If you don't have the
631 persistent disk rules in /dev/disk/by-*/* on your distro, just
632 grab it from here. :)
636 We can use socket communication now to pass events from udev to
638 RUN+="socket:/org/freedesktop/hal/udev_event"
639 will pass the whole udev event to the HAL daemon without the need
640 for a forked helper. (See ChangeLog for udevmonitor, as an example)
644 Mostly bugfixes and see ChangeLog.
646 The test for the existence of an environment value should be
648 ENV{KEY}=="*" to ENV{KEY}=="?*"
649 because "*" will not fail anymore, if the key does not exist or
654 Bugfixes and a few tweaks described in the ChangeLog.
658 Mostly a Bugfix release.
660 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
661 timing with custom rules.
665 We changed the internal rule storage format. Our large rule files took
666 2 MB of RAM, with the change we are down to 99kB.
668 If the device-node has been created with default name and no symlink or
669 options are to remenber, it is not longer stored in the udevdb. HAL will
670 need to be updated to work correctly with that change.
672 To overrride optimization flags, OPTFLAGS may be used now.
680 Major changes happened with this release. The goal is to take over the
681 complete kernel-event handling and provide a more efficient way to dispatch
682 kernel events. Replacing most of the current shell script logic and the
683 kernel forked helper with a netlink-daemon and a rule-based event handling.
685 o udevd listens to netlink events now. The first valid netlink event
686 will make udevd ignore any message from udevsend that contains a
687 SEQNUM, to avoid duplicate events. The forked events can be disabled
689 echo "" > /proc/sys/kernel/hotplug
690 For full support, the broken input-subsytem needs to be fixed, not to
691 bypass the driver core.
693 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
694 removed from udev itself and must be emulated by calling small
695 helper binaries provided in the extras folder:
696 make EXTRAS=extras/run_directory/
697 will build udev_run_devd and udev_run_hotplugd, which can be called
698 from a rule if needed:
699 RUN+="/sbin/udev_run_hotplugd"
700 The recommended way to handle this is to convert all the calls from
701 the directories to explicit udev rules and get completely rid of the
702 multiplexing. (To catch a ttyUSB event, you now no longer need to
703 fork and exit 300 tty script instances you are not interested in, it
704 is just one rule that matches exactly the device.)
706 o udev handles now _all_ events not just events for class and block
707 devices, this way it is possible to control the complete event
708 behavior with udev rules. Especially useful for rules like:
709 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
711 o As used in the modalias rule, udev supports now textual
712 substitution placeholder along with the usual format chars. This
713 needs to be documented, for now it's only visible in udev_rules_parse.c.
715 o The rule keys support now more operations. This is documented in the
716 man page. It is possible to add values to list-keys like the SYMLINK
717 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
718 Also "final"-assignments are supported by using KEY:="value", which will
719 prevent changing the key by any later rule.
721 o kernel 2.6.12 has the "detached_state" attribute removed from
722 sysfs, which was used to recognize sysfs population. We switched that
723 to wait for the "bus" link, which is only available in kernels after 2.6.11.
724 Running this udev version on older kernels may cause a short delay for
727 o To provide infrastructure for persistent device naming, the id programs:
728 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
729 to export the probed data in environment key format:
730 pim:~ # /sbin/ata_id --export /dev/hda
731 ID_MODEL=HTS726060M9AT00
732 ID_SERIAL=MRH401M4G6UM9B
736 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
737 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
740 kay@pim:~> tree /dev/disk
743 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
744 | `-- IBM-Memory_Key -> ../../sda
746 | |-- swap -> ../../hda1
747 | |-- date -> ../../sda1
748 | `-- home -> ../../hda3
750 |-- 2E08712B0870F2E7 -> ../../hda3
751 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
752 |-- E845-7A89 -> ../../sda1
753 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
755 The IMPORT= operation will import these keys in the environment and make
756 it available for later PROGRAM= and RUN= executed programs. The keys are
757 also stored in the udevdb and can be queried from there with one of the
760 o A few binaries are silently added to the repository, which can be used
761 to replay kernel events from initramfs instead of using coldplug. udevd
762 can be instructed now to queue-up events while the stored events from
763 initramfs are filled into the udevd-queue. This code is still under
764 development and there is no documentation now besides the code itself.
765 The additional binaries get compiled, but are not installed by default.
767 o There is also a temporary fix for a performance problem where too many
768 events happen in parallel and every event needs to parse the rules.
769 udev can now read precompiled rules stored on disk. This is likely to be
770 replaced by a more elegant solution in a future udev version.
774 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
775 Fix for libsysfs not to expect this file was added.
779 All rules are applied now, but only the first matching rule with a NAME-key
780 will be applied. All later rules with NAME-key are completely ignored. This
781 way system supplied symlinks or permissions gets applied to user-defined
785 Please check your rules setup, if you may need to add OPTIONS="last_rule"
786 to some rules, to keep the old behavior.
788 The rules are read on "remove"-events too. That makes is possible to match
789 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
790 instruct udev to ignore an event (OPTIONS="ignore_device").
791 The new ACTION-key may be used to let a rule act only at a "remove"-event.
793 The new RUN-key supports rule-based execution of programs after device-node
794 handling. This is meant as a general replacement for the dev.d/-directories
795 to give fine grained control over the execution of programs.
797 The %s{}-sysfs format char replacement values are searched at any of the
798 devices in the device chain now, not only at the class-device.
800 We support log priority levels now. The value udev_log in udev.conf is used
801 to determine what is printed to syslog. This makes it possible to
802 run a version with compiled-in debug messages in a production environment
803 which is sometimes needed to find a bug.
804 It is still possible to supress the inclusion of _any_ syslog usage with
805 USE_LOG=false to create the smallest possible binaries if needed.
806 The configured udev_log value can be overridden with the environment variable
811 Possible use of a system-wide klibc:
812 make USE_KLIBC=true KLCC=/usr/bin/klcc all
813 will link against an external klibc and our own version will be ignored.
817 We support an unlimited count of symlinks now.
819 If USE_STATIC=true is passed to a glibc build, we link statically and use
820 a built-in userdb parser to resolve user and group names.
822 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
823 we walk up the chain of physical devices to find a match.
825 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
826 easy to skip certain attribute matches without composing rules with weird
827 character class negations like:
828 KERNEL="[!s][!c][!d]*"
829 this can now be replaced with:
831 The current simple '=' is still supported, and should work as it does today,
832 but existing rules should be converted if possible, to be better readable.
834 We have new ENV{}== key now, to match against a maximum of 5 environment
837 udevstart is its own binary again, because we don't need co carry this araound
838 with every forked event.
~ianmdlvl / elogind.git / blob