5 The cdrom_id program is replaced by an advanced version, which can
6 detect most common device types, and also properties of the inserted
7 media. This is part of moving some basic functionality from HAL into
14 The last WAIT_FOR_SYSFS rule is removed from the default rules.
16 The symlinks to udevadm for the debugging tools: udevmonitor and
17 udevtest are no longer created.
19 The symlinks to the udevadm man page for the old tool names are
22 Abstract namespace sockets paths in RUN+="socket:@<path>" rules,
23 should be prefixed with '@' to indicate that the path is not a
34 Udevstart is removed from the tree, it did not get installed for
35 a long time now, and is long replaced by trigger and settle.
41 All udev tools are merged into a single binary called udevadm.
42 The old names of the tools are built-in commands in udevadm now.
43 Symlinks to udevadm, with the names of the old tools, provide
44 the same functionality as the standalone tools. There is also
45 only a single udevadm.8 man page left for all tools.
47 Tools like mkinitramfs should be checked, if they need to include
48 udevadm in the list of files.
58 The etc/udev/rules.d/ directory now contains a default set of basic
59 udev rules. This initial version is the result of a rules file merge
60 of Fedora and openSUSE. For these both distros only a few specific
61 rules are left in their own file, named after the distro. Rules which
62 are optionally installed, because they are only valid for a specific
63 architecture, or rules for subsystems which are not always used are
64 in etc/udev/packages/.
70 Dynamic rules can be created in /dev/.udev/rules.d/ to trigger
71 actions by dynamically created rules.
73 SYMLINK=="<value>" matches agains the entries in the list of
74 currently defined symlinks. The links are not created in the
75 filesystem at that point in time, but the values can be matched.
77 RUN{ignore_error}+="<program>" will ignore any exit code from the
78 program and not record as a failed event.
84 Final merge of patches/features from the Ubuntu package.
90 Control characters in filesystem label strings are no longer silenty
91 removed, but hex-encoded, to be able to uniquely identify the device
92 by its symlink in /dev/disk/by-label/.
93 If libvolume_id is used by mount(8), LABEL= will work as expected,
94 if slashes or other characters are used in the label string.
96 To test the existence of a file, TEST=="<file>" and TEST!="<file>"
97 can be specified now. The TEST key accepts an optional mode mask
98 TEST{0100}=="<is executable file>".
100 Scsi_id now supports a mode without expecting scsi-specific sysfs
101 entries to allow the extraction of cciss-device persistent properties.
107 In the future, we may see uuid's which are just simple character
108 strings (see the DDF Raid Specification). For that reason vol_id now
109 exports ID_FS_UUID_SAFE, just like ID_FS_LABEL_SAFE. For things like
110 the creation of symlinks, the *_SAFE values ensure, that no control
111 or whitespace characters are used in the filename.
113 Possible users of libvolume_id, please use the volume_id_get_* functions.
114 The public struct will go away in a future release of the library.
120 Removal of useless extras/eventrecorder.sh.
130 The directory multiplexer for dev.d/ and hotplug.d are finally removed
131 from the udev package.
137 Symlinks can have priorities now, the priority is assigned to the device
138 and specified with OPTIONS="link_priority=100". Devices with higher
139 priorities overwrite the symlinks of devices with lower priorities.
140 If the device that currently owns the link, goes away, the symlink
141 will be removed, and recreated, pointing to the next device with the
142 highest actual priority. This should make /dev/disk/by-{label,uuid,id}
143 more reliable, if multiple devices contain the same metadata and overwrite
146 The dasd_id program is removed from the udev tree, and dasdinfo, with the
147 needed rules, are part of the s390-tools now.
149 Please add KERNEL=="[0-9]*:[0-9]*" to the scsi wait-for-sysfs rule,
150 we may get the scsi sysfs mess fixed some day, and this will only catch
151 the devices we are looking for.
153 USB serial numbers for storage devices have the target:lun now appended,
154 to make it possibble to distinguish broken multi-lun devices with all
155 the same SCSI identifiers.
157 Note: The extra "run_directory" which searches and executes stuff in
158 /etc/hotplug.d/ and /etc/dev.d/ is long deprecated, and will be removed
159 with the next release. Make sure, that you don't use it anymore, or
160 provides your own implementation of that inefficient stuff.
161 We are tired of reports about a "slow udev", because these directories
162 contain stuff, that runs with _every_ event, instead of using rules,
163 that run programs only for the matching events.
173 DRIVER== will match only for devices that actually have a real
174 driver. DRIVERS== must be used, if parent devices should be
175 included in the match.
177 Libvolume_id's "linux_raid" detection needed another fix.
185 Add additional check to volume_id detection of via_raid, cause
186 some company decided to put a matching pattern all over the empty
187 storage area of their music players.
191 Fix path_id for SAS devices.
195 The udev daemon can be started with --debug-trace now, which will
196 execute all events serialized to get a chance to catch a possible
197 action that crashes the box.
199 A warning is logged, if PHYSDEV* keys, the "device" link, or a parent
200 device attribute like $attr{../file} is used, only WAIT_FOR_SYSFS rules
201 are excluded from the warning. Referencing parent attributes directly
202 may break when something in the kernel driver model changes. Udev will
203 just find the attribute by walking up the parent chain.
205 Udevtrigger now sorts the list of devices depending on the device
206 dependency, so a "usb" device is triggered after the parent "pci"
211 Revert persistent-storage ata-serial '_' '-' replacement.
217 Udevtrigger can now filter the list of devices to be triggered. Matches
218 for subsystems or sysfs attributes can be specified.
220 The entries in /dev/.udev/queue and /dev/.udev/failed have changed to
221 zero-sized files to avoid pointing to /sys and confuse broken tools which
222 scan the /dev directory. To retry failed events, udevtrigger --retry-failed
225 The rules and scripts to create udev rules for persistent network
226 devices and optical drives are in the extras/rules_generator directory
227 now. If you use something similar, please consider replacing your own
228 version with this, to share the support effort. The rule_generator
229 installs its own rules into /etc/udev/rules.d.
231 The cdrom_id tool installs its own rule now in /etc/udev/rules.d, cause
232 the rule_generator depends on cdrom_id to be called in an earlier rule.
238 Renaming of some key names (the old names still work):
239 BUS -> SUBSYSTEMS, ID -> KERNELS, SYSFS -> ATTRS, DRIVER -> DRIVERS.
240 (The behavior of the key DRIVER will change soon in one of the next
241 releases, to match only the event device, please switch to DRIVERS
242 instead. If DRIVER is used, it will behave like DRIVERS, but an error
244 With the new key names, we have a more consistent and simpler scheme.
245 We can match the properties of the event device only, with: KERNEL,
246 SUBSYSTEM, ATTR, DRIVER. Or include all the parent devices in the match,
247 with: KERNELS, SUBSYSTEMS, ATTRS, DRIVERS. ID, BUS, SYSFS, DRIVER are no
248 longer mentioned in the man page and should be switched in the rule
251 ATTR{file}="value" can be used now, to write to a sysfs file of the
252 event device. Instead of:
253 ..., SYSFS{type}=="0|7|14", RUN+="/bin/sh -c 'echo 60 > /sys$$DEVPATH/timeout'"
255 ..., ATTR{type}=="0|7|14", ATTR{timeout}="60"
257 All the PHYSDEV* keys are deprecated and will be removed from a
259 PHYDEVPATH - is the path of a parent device and should not be
261 PHYSDEVBUS - is just a SUBSYSTEM value of a parent, and can be
262 matched with SUBSYSTEMS==
263 PHYSDEVDRIVER - for bus devices it is available as ENV{DRIVER}.
264 Newer kernels will have DRIVER in the environment,
265 for older kernels udev puts in. Class device will
266 no longer carry this property of a parent and
267 DRIVERS== can be used to match such a parent value.
268 Note that ENV{DRIVER} is only available for a few bus devices, where
269 the driver is already bound at device event time. On coldplug, the
270 events for a lot devices are already bound to a driver, and they will have
271 that value set. But on hotplug, at the time the kernel creates the device,
272 it can't know what driver may claim the device after that, therefore
273 in most cases it will be empty.
275 Failed events should now be re-triggered with:
276 udevtrigger --retry-failed.
277 Please switch to this command, so we keep the details of the /dev/.udev/failed/
278 files private to the udev tools. We may need to switch the current symlink
279 target, cause some obviously broken tools try to scan all files in /dev
280 including /dev/.udev/, find the links to /sys and end up stat()'ing sysfs files
281 million times. This takes ages on slow boxes.
283 The udevinfo attribute walk (-a) now works with giving a device node
284 name (-n) instead of a devpath (-p). The query now always works, also when
285 no database file was created by udev.
287 The built-in /etc/passwd /etc/group parser is removed, we always depend on
288 getpwnam() and getgrnam() now. One of the next releases will depend on
289 fnmatch() and may use getopt_long().
293 Bugfixes and small improvements.
297 Fix path_id for recent kernels.
303 Added support for swapping network interface names, by temporarily
304 renaming the device and wait for the target name to become free.
308 The built-in MODALIAS key and substitution is removed.
312 The binary firmware helper is replaced by the usual simple
313 shell script. Udevsend is removed from the tree.
321 Some more keys require the correct use of '==' and '=' depending
322 on the kind of operation beeing an assignment or a match. Rules
323 with invalid operations are skipped and logged to syslog. Please
324 test with udevtest if the parsing of your rules throws errors and
325 fix possibly broken rules.
329 Provide "udevsettle" to wait for all current udev events to finish.
330 It also watches the current kernel netlink queue by comparing the
331 even sequence number to make sure that there are no current pending
332 events that have not already arrived in the daemon.
336 Fix rule to skip persistent rules for removable IDE devices, which
337 also skipped optical IDE drives.
339 All *_id program are installed in /lib/udev/ by default now.
341 No binary is stripped anymore as this should be done in the
342 packaging process and not at build time.
344 libvolume_id is provided as a shared library now and vol_id is
345 linked against it. Also one of the next HAL versions will require
346 this library, and the HAL build process will also require the
347 header file to be installed. The copy of the same code in HAL will
348 be removed to have only a single copy left on the system.
352 Add persistent links for SCSI tapes. The rules file is renamed
353 to 60-persistent-storage.rules.
355 Create persistent path for usb devices. Can be used for all sorts
356 of devices that can't be distinguished by other properties like
357 multiple identical keyboards and mice connected to the same box.
359 Provide "udevtrigger" program to request events on coldplug. The
360 shell script is much too slow with thousends of devices.
364 Fix persistent disk rules to exclude removable IDE drives.
366 Warn if %e, $modalias or MODALIAS is used.
370 Fix queue export, which wasn't correct for subsequent add/remove
371 events for the same device.
375 Fix cramfs detection on big endian.
377 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
382 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
383 attributes were only checked at the parent device that matched the
384 by BUS requested subsystem. Fix it to also look at the device we
385 received the event for.
387 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
392 Fix a bug where NAME="" would prevent RUN from beeing executed.
394 RUN="/bin/program" does not longer automatically add the subsystem
395 as the first parameter. This is from the days of /sbin/hotplug
396 which is dead now and it's just confusing to need to add a space at
397 the end of the program name to prevent this.
398 If you use rules that need the subsystem as the first parameter,
399 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
400 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
404 The udev man page has moved to udev(7) as it does not describe a command
405 anymore. The programs udev, udevstart and udevsend are no longer installed
406 by default and must be copied manually, if they should be installed or
407 included in a package.
409 Fix a bug where "ignore_device" could run earlier collected RUN keys before
410 the ignore rule was applied.
412 More preparation for future sysfs changes. usb_id and scsi_id no longer
413 depend on a magic order of devices in the /devices chain. Specific devices
414 should be requested by their subsytem.
416 This will always find the scsi parent device without depending on a specific
418 dev = sysfs_device_get(devpath);
419 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
421 The "device" link in the current sysfs layout will be automatically
422 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
423 parent in the devpath. If a device is requested by it's symlink, like all
424 class devices in the new sysfs layout will look like, it gets automatically
425 resolved and substituted with the real devpath and not the symlink path.
428 A similar logic must be applied to _all_ sysfs users, including
429 scripts, that search along parent devices in sysfs. The explicit use of
430 the "device" link must be avoided. With the future sysfs layout all
431 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
432 back to the "class" or the "bus". The layout of the parent devices in
433 /devices is not necessarily expected to be stable across kernel releases and
434 searching for parents by their subsystem should make sysfs users tolerant
435 for changed parent chains.
439 Prepare udev to work with the experimental kernel patch, that moves
440 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
442 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
443 moving the class devices to /sys/devices.
445 Thanks again to Marco for help finding a hopefully nice compromise
446 to make %b simpler and working again.
450 Complete removal of libsysfs, replaced by simple helper functions
451 which are much simpler and a bit faster. The udev daemon operatesentirely
452 on event parameters and does not use sysfs for simple rules anymore.
453 Please report any new bugs/problems, that may be caused by this big
454 change. They will be fixed immediately.
456 The enumeration format character '%e' is deprecated and will be
457 removed sometimes from a future udev version. It never worked correctly
458 outside of udevstart, so we can't use it with the new parallel
459 coldplug. A simple enumeration is as useless as the devfs naming
460 scheme, just get rid of both if you still use it.
462 MODALIAS and $modalias is not needed and will be removed from one of
463 the next udev versions, replace it in all rules with ENV{MODALIAS} or
464 the sysfs "modalias" value.
466 Thanks a lot to Marco for all his help on finding and fixing bugs.
470 Let scsi_id request libata drive serial numbers from page 0x80.
472 Renamed etc/udev/persistent.rules to persistent-disk.rules and
473 added /dev/disk/by-name/* for device mapper device names.
475 Removed %e from the man page. It never worked reliably outside
476 of udevstart and udevstart is no longer recommended to use.
480 Symlinks are now exported to the event environment. Hopefully it's no
481 longer needed to run udevinfo from an event process, like it was
482 mentioned on the hotplug list:
483 UDEV [1134776873.702967] add@/block/sdb
486 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
490 Fix a problem if udevsend is used as the hotplug handler and tries to use
491 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
492 and this kind of problems will hopefully go away soon.
496 All built-in logic to work around bad sysfs timing is removed with this
497 version. The need to wait for sysfs files is almost fixed with a kernel
498 version that doesn't work with this udev version anyway. Until we fix
499 the timing of the "bus" link creation, the former integrated logic should
500 be emulated by a rule placed before all other rules:
501 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
503 The option "udev_db" does no longer exist. All udev state will be in
504 /$udev_root/.udev/ now, there is no longer an option to set this
506 If the init script or something else used this value, just depend on
507 this hardcoded path. But remember _all_content_ of this directory is
508 still private to udev and can change at any time.
510 Default location for rule sripts and helper programs is now: /lib/udev/.
511 Everything that is not useful on the commandline should go into this
512 directory. Some of the helpers in the extras folder are installed there
513 now. The rules need to be changed, to find the helpers there.
515 Also /lib/udev/devices is recommended as a directory where packages or
516 the user can place real device nodes, which get copied over to /dev at
517 every boot. This should replace the various solutions with custom config
520 Udevsend does no longer start the udev daemon. This must be done with
521 the init script that prepares /dev on tmpfs and creates the initial nodes,
522 before starting the daemon.
526 Silent a too verbose error logging for the old hotplug.d/ dev.d/
529 The copy of klibc is removed. A systemwide installed version of klibc
530 should be used to build a klibc udev now.
534 NAME="" will not create any nodes, but execute RUN keys. To completely
535 ignore an event the OPTION "ignore_device" should be used.
537 After removal of the reorder queue, events with a TIMEOUT can be executed
538 without any queuing now.
542 Fixed bug in udevd, if inotify is not available. We depend on netlink
543 uevents now, kernels without that event source will not work with that
544 version of udev anymore.
548 The rule parsing happens now in the daemon once at startup, all udev
549 event processes inherit the already parsed rules from the daemon.
550 It is shipped with SUSE10.0 and reduces heavily the system load at
551 startup. The option to save precompiled rules and let the udev process
552 pick the them up is removed, as it's no longer needed.
554 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
555 device. Libsysfs is changed to "translate" the requested link into the
556 real device path, as it would happen with the hotplug event. Otherwise
557 device removal and the udev database will not work.
559 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
562 A few improvements for vol_id, the filesytem probing code.
566 Fix a stupid typo in extras/run_directory for "make install".
568 scsi_id creates the temporary devnode now in /dev for usage with a
569 non-writable /tmp directory.
571 The uevent kernel socket buffer can carry app. 50.000 events now,
572 let's see who can break this again. :)
574 The upcoming kernel will have a new input driver core integration.
575 Some class devices are now symlinks to the real device. libsysfs
576 needs a fix for this to work correctly. Udevstart of older udev
577 versions will _not_ create these devices!
581 Fix a 'install' target in the Makefile, that prevents EXTRAS from
586 A bunch of mostly trivial bugfixes. From now on no node name or
587 symlink name can contain any character than plain whitelisted ascii
588 characters or validated utf8 byte-streams. This is needed for the
589 /dev/disk/by-label/* links, because we import untrusted data and
590 export it to the filesystem.
594 More bugfixes. If udevd was started from the kernel, we don't
595 have stdin/stdout/stderr, which broke the forked tools in some
600 Bugfix. udevstart event ordering was broken for a long time.
601 The new run_program() uncovered it, because /dev/null was not
602 available while we try to run external programs.
603 Now udevstart should create it before we run anything.
607 Minor bugfixes and some distro rules updates. If you don't have the
608 persistent disk rules in /dev/disk/by-*/* on your distro, just
609 grab it from here. :)
613 We can use socket communication now to pass events from udev to
615 RUN+="socket:/org/freedesktop/hal/udev_event"
616 will pass the whole udev event to the HAL daemon without the need
617 for a forked helper. (See ChangeLog for udevmonitor, as an example)
621 Mostly bugfixes and see ChangeLog.
623 The test for the existence of an environment value should be
625 ENV{KEY}=="*" to ENV{KEY}=="?*"
626 because "*" will not fail anymore, if the key does not exist or
631 Bugfixes and a few tweaks described in the ChangeLog.
635 Mostly a Bugfix release.
637 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
638 timing with custom rules.
642 We changed the internal rule storage format. Our large rule files took
643 2 MB of RAM, with the change we are down to 99kB.
645 If the device-node has been created with default name and no symlink or
646 options are to remenber, it is not longer stored in the udevdb. HAL will
647 need to be updated to work correctly with that change.
649 To overrride optimization flags, OPTFLAGS may be used now.
657 Major changes happened with this release. The goal is to take over the
658 complete kernel-event handling and provide a more efficient way to dispatch
659 kernel events. Replacing most of the current shell script logic and the
660 kernel forked helper with a netlink-daemon and a rule-based event handling.
662 o udevd listens to netlink events now. The first valid netlink event
663 will make udevd ignore any message from udevsend that contains a
664 SEQNUM, to avoid duplicate events. The forked events can be disabled
666 echo "" > /proc/sys/kernel/hotplug
667 For full support, the broken input-subsytem needs to be fixed, not to
668 bypass the driver core.
670 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
671 removed from udev itself and must be emulated by calling small
672 helper binaries provided in the extras folder:
673 make EXTRAS=extras/run_directory/
674 will build udev_run_devd and udev_run_hotplugd, which can be called
675 from a rule if needed:
676 RUN+="/sbin/udev_run_hotplugd"
677 The recommended way to handle this is to convert all the calls from
678 the directories to explicit udev rules and get completely rid of the
679 multiplexing. (To catch a ttyUSB event, you now no longer need to
680 fork and exit 300 tty script instances you are not interested in, it
681 is just one rule that matches exactly the device.)
683 o udev handles now _all_ events not just events for class and block
684 devices, this way it is possible to control the complete event
685 behavior with udev rules. Especially useful for rules like:
686 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
688 o As used in the modalias rule, udev supports now textual
689 substitution placeholder along with the usual format chars. This
690 needs to be documented, for now it's only visible in udev_rules_parse.c.
692 o The rule keys support now more operations. This is documented in the
693 man page. It is possible to add values to list-keys like the SYMLINK
694 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
695 Also "final"-assignments are supported by using KEY:="value", which will
696 prevent changing the key by any later rule.
698 o kernel 2.6.12 has the "detached_state" attribute removed from
699 sysfs, which was used to recognize sysfs population. We switched that
700 to wait for the "bus" link, which is only available in kernels after 2.6.11.
701 Running this udev version on older kernels may cause a short delay for
704 o To provide infrastructure for persistent device naming, the id programs:
705 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
706 to export the probed data in environment key format:
707 pim:~ # /sbin/ata_id --export /dev/hda
708 ID_MODEL=HTS726060M9AT00
709 ID_SERIAL=MRH401M4G6UM9B
713 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
714 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
717 kay@pim:~> tree /dev/disk
720 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
721 | `-- IBM-Memory_Key -> ../../sda
723 | |-- swap -> ../../hda1
724 | |-- date -> ../../sda1
725 | `-- home -> ../../hda3
727 |-- 2E08712B0870F2E7 -> ../../hda3
728 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
729 |-- E845-7A89 -> ../../sda1
730 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
732 The IMPORT= operation will import these keys in the environment and make
733 it available for later PROGRAM= and RUN= executed programs. The keys are
734 also stored in the udevdb and can be queried from there with one of the
737 o A few binaries are silently added to the repository, which can be used
738 to replay kernel events from initramfs instead of using coldplug. udevd
739 can be instructed now to queue-up events while the stored events from
740 initramfs are filled into the udevd-queue. This code is still under
741 development and there is no documentation now besides the code itself.
742 The additional binaries get compiled, but are not installed by default.
744 o There is also a temporary fix for a performance problem where too many
745 events happen in parallel and every event needs to parse the rules.
746 udev can now read precompiled rules stored on disk. This is likely to be
747 replaced by a more elegant solution in a future udev version.
751 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
752 Fix for libsysfs not to expect this file was added.
756 All rules are applied now, but only the first matching rule with a NAME-key
757 will be applied. All later rules with NAME-key are completely ignored. This
758 way system supplied symlinks or permissions gets applied to user-defined
762 Please check your rules setup, if you may need to add OPTIONS="last_rule"
763 to some rules, to keep the old behavior.
765 The rules are read on "remove"-events too. That makes is possible to match
766 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
767 instruct udev to ignore an event (OPTIONS="ignore_device").
768 The new ACTION-key may be used to let a rule act only at a "remove"-event.
770 The new RUN-key supports rule-based execution of programs after device-node
771 handling. This is meant as a general replacement for the dev.d/-directories
772 to give fine grained control over the execution of programs.
774 The %s{}-sysfs format char replacement values are searched at any of the
775 devices in the device chain now, not only at the class-device.
777 We support log priority levels now. The value udev_log in udev.conf is used
778 to determine what is printed to syslog. This makes it possible to
779 run a version with compiled-in debug messages in a production environment
780 which is sometimes needed to find a bug.
781 It is still possible to supress the inclusion of _any_ syslog usage with
782 USE_LOG=false to create the smallest possible binaries if needed.
783 The configured udev_log value can be overridden with the environment variable
788 Possible use of a system-wide klibc:
789 make USE_KLIBC=true KLCC=/usr/bin/klcc all
790 will link against an external klibc and our own version will be ignored.
794 We support an unlimited count of symlinks now.
796 If USE_STATIC=true is passed to a glibc build, we link statically and use
797 a built-in userdb parser to resolve user and group names.
799 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
800 we walk up the chain of physical devices to find a match.
802 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
803 easy to skip certain attribute matches without composing rules with weird
804 character class negations like:
805 KERNEL="[!s][!c][!d]*"
806 this can now be replaced with:
808 The current simple '=' is still supported, and should work as it does today,
809 but existing rules should be converted if possible, to be better readable.
811 We have new ENV{}== key now, to match against a maximum of 5 environment
814 udevstart is its own binary again, because we don't need co carry this araound
815 with every forked event.
~ianmdlvl / elogind.git / blob