3 The built-in MODALIAS key and substitution is removed.
7 The binary firmware helper is replaced by the usual simple
8 shell script. Udevsend is removed from the tree.
16 Some more keys require the correct use of '==' and '=' depending
17 on the kind of operation beeing an assignment or a match. Rules
18 with invalid operations are skipped and logged to syslog. Please
19 test with udevtest if the parsing of your rules throws errors and
20 fix possibly broken rules.
24 Provide "udevsettle" to wait for all current udev events to finish.
25 It also watches the current kernel netlink queue by comparing the
26 even sequence number to make sure that there are no current pending
27 events that have not already arrived in the daemon.
31 Fix rule to skip persistent rules for removable IDE devices, which
32 also skipped optical IDE drives.
34 All *_id program are installed in /lib/udev/ by default now.
36 No binary is stripped anymore as this should be done in the
37 packaging process and not at build time.
39 libvolume_id is provided as a shared library now and vol_id is
40 linked against it. Also one of the next HAL versions will require
41 this library, and the HAL build process will also require the
42 header file to be installed. The copy of the same code in HAL will
43 be removed to have only a single copy left on the system.
47 Add persistent links for SCSI tapes. The rules file is renamed
48 to 60-persistent-storage.rules.
50 Create persistent path for usb devices. Can be used for all sorts
51 of devices that can't be distinguished by other properties like
52 multiple identical keyboards and mice connected to the same box.
54 Provide "udevtrigger" program to request events on coldplug. The
55 shell script is much too slow with thousends of devices.
59 Fix persistent disk rules to exclude removable IDE drives.
61 Warn if %e, $modalias or MODALIAS is used.
65 Fix queue export, which wasn't correct for subsequent add/remove
66 events for the same device.
70 Fix cramfs detection on big endian.
72 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
77 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
78 attributes were only checked at the parent device that matched the
79 by BUS requested subsystem. Fix it to also look at the device we
80 received the event for.
82 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
87 Fix a bug where NAME="" would prevent RUN from beeing executed.
89 RUN="/bin/program" does not longer automatically add the subsystem
90 as the first parameter. This is from the days of /sbin/hotplug
91 which is dead now and it's just confusing to need to add a space at
92 the end of the program name to prevent this.
93 If you use rules that need the subsystem as the first parameter,
94 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
95 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
99 The udev man page has moved to udev(7) as it does not describe a command
100 anymore. The programs udev, udevstart and udevsend are no longer installed
101 by default and must be copied manually, if they should be installed or
102 included in a package.
104 Fix a bug where "ignore_device" could run earlier collected RUN keys before
105 the ignore rule was applied.
107 More preparation for future sysfs changes. usb_id and scsi_id no longer
108 depend on a magic order of devices in the /devices chain. Specific devices
109 should be requested by their subsytem.
111 This will always find the scsi parent device without depending on a specific
113 dev = sysfs_device_get(devpath);
114 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
116 The "device" link in the current sysfs layout will be automatically
117 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
118 parent in the devpath. If a device is requested by it's symlink, like all
119 class devices in the new sysfs layout will look like, it gets automatically
120 resolved and substituted with the real devpath and not the symlink path.
123 A similar logic must be applied to _all_ sysfs users, including
124 scripts, that search along parent devices in sysfs. The explicit use of
125 the "device" link must be avoided. With the future sysfs layout all
126 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
127 back to the "class" or the "bus". The layout of the parent devices in
128 /devices is not necessarily expected to be stable across kernel releases and
129 searching for parents by their subsystem should make sysfs users tolerant
130 for changed parent chains.
134 Prepare udev to work with the experimental kernel patch, that moves
135 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
137 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
138 moving the class devices to /sys/devices.
140 Thanks again to Marco for help finding a hopefully nice compromise
141 to make %b simpler and working again.
145 Complete removal of libsysfs, replaced by simple helper functions
146 which are much simpler and a bit faster. The udev daemon operatesentirely
147 on event parameters and does not use sysfs for simple rules anymore.
148 Please report any new bugs/problems, that may be caused by this big
149 change. They will be fixed immediately.
151 The enumeration format character '%e' is deprecated and will be
152 removed sometimes from a future udev version. It never worked correctly
153 outside of udevstart, so we can't use it with the new parallel
154 coldplug. A simple enumeration is as useless as the devfs naming
155 scheme, just get rid of both if you still use it.
157 MODALIAS and $modalias is not needed and will be removed from one of
158 the next udev versions, replace it in all rules with ENV{MODALIAS} or
159 the sysfs "modalias" value.
161 Thanks a lot to Marco for all his help on finding and fixing bugs.
165 Let scsi_id request libata drive serial numbers from page 0x80.
167 Renamed etc/udev/persistent.rules to persistent-disk.rules and
168 added /dev/disk/by-name/* for device mapper device names.
170 Removed %e from the man page. It never worked reliably outside
171 of udevstart and udevstart is no longer recommended to use.
175 Symlinks are now exported to the event environment. Hopefully it's no
176 longer needed to run udevinfo from an event process, like it was
177 mentioned on the hotplug list:
178 UDEV [1134776873.702967] add@/block/sdb
181 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
185 Fix a problem if udevsend is used as the hotplug handler and tries to use
186 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
187 and this kind of problems will hopefully go away soon.
191 All built-in logic to work around bad sysfs timing is removed with this
192 version. The need to wait for sysfs files is almost fixed with a kernel
193 version that doesn't work with this udev version anyway. Until we fix
194 the timing of the "bus" link creation, the former integrated logic should
195 be emulated by a rule placed before all other rules:
196 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
198 The option "udev_db" does no longer exist. All udev state will be in
199 /$udev_root/.udev/ now, there is no longer an option to set this
201 If the init script or something else used this value, just depend on
202 this hardcoded path. But remember _all_content_ of this directory is
203 still private to udev and can change at any time.
205 Default location for rule sripts and helper programs is now: /lib/udev/.
206 Everything that is not useful on the commandline should go into this
207 directory. Some of the helpers in the extras folder are installed there
208 now. The rules need to be changed, to find the helpers there.
210 Also /lib/udev/devices is recommended as a directory where packages or
211 the user can place real device nodes, which get copied over to /dev at
212 every boot. This should replace the various solutions with custom config
215 Udevsend does no longer start the udev daemon. This must be done with
216 the init script that prepares /dev on tmpfs and creates the initial nodes,
217 before starting the daemon.
221 Silent a too verbose error logging for the old hotplug.d/ dev.d/
224 The copy of klibc is removed. A systemwide installed version of klibc
225 should be used to build a klibc udev now.
229 NAME="" will not create any nodes, but execute RUN keys. To completely
230 ignore an event the OPTION "ignore_device" should be used.
232 After removal of the reorder queue, events with a TIMEOUT can be executed
233 without any queuing now.
237 Fixed bug in udevd, if inotify is not available. We depend on netlink
238 uevents now, kernels without that event source will not work with that
239 version of udev anymore.
243 The rule parsing happens now in the daemon once at startup, all udev
244 event processes inherit the already parsed rules from the daemon.
245 It is shipped with SUSE10.0 and reduces heavily the system load at
246 startup. The option to save precompiled rules and let the udev process
247 pick the them up is removed, as it's no longer needed.
249 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
250 device. Libsysfs is changed to "translate" the requested link into the
251 real device path, as it would happen with the hotplug event. Otherwise
252 device removal and the udev database will not work.
254 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
257 A few improvements for vol_id, the filesytem probing code.
261 Fix a stupid typo in extras/run_directory for "make install".
263 scsi_id creates the temporary devnode now in /dev for usage with a
264 non-writable /tmp directory.
266 The uevent kernel socket buffer can carry app. 50.000 events now,
267 let's see who can break this again. :)
269 The upcoming kernel will have a new input driver core integration.
270 Some class devices are now symlinks to the real device. libsysfs
271 needs a fix for this to work correctly. Udevstart of older udev
272 versions will _not_ create these devices!
276 Fix a 'install' target in the Makefile, that prevents EXTRAS from
281 A bunch of mostly trivial bugfixes. From now on no node name or
282 symlink name can contain any character than plain whitelisted ascii
283 characters or validated utf8 byte-streams. This is needed for the
284 /dev/disk/by-label/* links, because we import untrusted data and
285 export it to the filesystem.
289 More bugfixes. If udevd was started from the kernel, we don't
290 have stdin/stdout/stderr, which broke the forked tools in some
295 Bugfix. udevstart event ordering was broken for a long time.
296 The new run_program() uncovered it, because /dev/null was not
297 available while we try to run external programs.
298 Now udevstart should create it before we run anything.
302 Minor bugfixes and some distro rules updates. If you don't have the
303 persistent disk rules in /dev/disk/by-*/* on your distro, just
304 grab it from here. :)
308 We can use socket communication now to pass events from udev to
310 RUN+="socket:/org/freedesktop/hal/udev_event"
311 will pass the whole udev event to the HAL daemon without the need
312 for a forked helper. (See ChangeLog for udevmonitor, as an example)
316 Mostly bugfixes and see ChangeLog.
318 The test for the existence of an environment value should be
320 ENV{KEY}=="*" to ENV{KEY}=="?*"
321 because "*" will not fail anymore, if the key does not exist or
326 Bugfixes and a few tweaks described in the ChangeLog.
330 Mostly a Bugfix release.
332 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
333 timing with custom rules.
337 We changed the internal rule storage format. Our large rule files took
338 2 MB of RAM, with the change we are down to 99kB.
340 If the device-node has been created with default name and no symlink or
341 options are to remenber, it is not longer stored in the udevdb. HAL will
342 need to be updated to work correctly with that change.
344 To overrride optimization flags, OPTFLAGS may be used now.
352 Major changes happened with this release. The goal is to take over the
353 complete kernel-event handling and provide a more efficient way to dispatch
354 kernel events. Replacing most of the current shell script logic and the
355 kernel forked helper with a netlink-daemon and a rule-based event handling.
357 o udevd listens to netlink events now. The first valid netlink event
358 will make udevd ignore any message from udevsend that contains a
359 SEQNUM, to avoid duplicate events. The forked events can be disabled
361 echo "" > /proc/sys/kernel/hotplug
362 For full support, the broken input-subsytem needs to be fixed, not to
363 bypass the driver core.
365 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
366 removed from udev itself and must be emulated by calling small
367 helper binaries provided in the extras folder:
368 make EXTRAS=extras/run_directory/
369 will build udev_run_devd and udev_run_hotplugd, which can be called
370 from a rule if needed:
371 RUN+="/sbin/udev_run_hotplugd"
372 The recommended way to handle this is to convert all the calls from
373 the directories to explicit udev rules and get completely rid of the
374 multiplexing. (To catch a ttyUSB event, you now no longer need to
375 fork and exit 300 tty script instances you are not interested in, it
376 is just one rule that matches exactly the device.)
378 o udev handles now _all_ events not just events for class and block
379 devices, this way it is possible to control the complete event
380 behavior with udev rules. Especially useful for rules like:
381 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
383 o As used in the modalias rule, udev supports now textual
384 substitution placeholder along with the usual format chars. This
385 needs to be documented, for now it's only visible in udev_rules_parse.c.
387 o The rule keys support now more operations. This is documented in the
388 man page. It is possible to add values to list-keys like the SYMLINK
389 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
390 Also "final"-assignments are supported by using KEY:="value", which will
391 prevent changing the key by any later rule.
393 o kernel 2.6.12 has the "detached_state" attribute removed from
394 sysfs, which was used to recognize sysfs population. We switched that
395 to wait for the "bus" link, which is only available in kernels after 2.6.11.
396 Running this udev version on older kernels may cause a short delay for
399 o To provide infrastructure for persistent device naming, the id programs:
400 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
401 to export the probed data in environment key format:
402 pim:~ # /sbin/ata_id --export /dev/hda
403 ID_MODEL=HTS726060M9AT00
404 ID_SERIAL=MRH401M4G6UM9B
408 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
409 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
412 kay@pim:~> tree /dev/disk
415 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
416 | `-- IBM-Memory_Key -> ../../sda
418 | |-- swap -> ../../hda1
419 | |-- date -> ../../sda1
420 | `-- home -> ../../hda3
422 |-- 2E08712B0870F2E7 -> ../../hda3
423 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
424 |-- E845-7A89 -> ../../sda1
425 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
427 The IMPORT= operation will import these keys in the environment and make
428 it available for later PROGRAM= and RUN= executed programs. The keys are
429 also stored in the udevdb and can be queried from there with one of the
432 o A few binaries are silently added to the repository, which can be used
433 to replay kernel events from initramfs instead of using coldplug. udevd
434 can be instructed now to queue-up events while the stored events from
435 initramfs are filled into the udevd-queue. This code is still under
436 development and there is no documentation now besides the code itself.
437 The additional binaries get compiled, but are not installed by default.
439 o There is also a temporary fix for a performance problem where too many
440 events happen in parallel and every event needs to parse the rules.
441 udev can now read precompiled rules stored on disk. This is likely to be
442 replaced by a more elegant solution in a future udev version.
446 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
447 Fix for libsysfs not to expect this file was added.
451 All rules are applied now, but only the first matching rule with a NAME-key
452 will be applied. All later rules with NAME-key are completely ignored. This
453 way system supplied symlinks or permissions gets applied to user-defined
457 Please check your rules setup, if you may need to add OPTIONS="last_rule"
458 to some rules, to keep the old behavior.
460 The rules are read on "remove"-events too. That makes is possible to match
461 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
462 instruct udev to ignore an event (OPTIONS="ignore_device").
463 The new ACTION-key may be used to let a rule act only at a "remove"-event.
465 The new RUN-key supports rule-based execution of programs after device-node
466 handling. This is meant as a general replacement for the dev.d/-directories
467 to give fine grained control over the execution of programs.
469 The %s{}-sysfs format char replacement values are searched at any of the
470 devices in the device chain now, not only at the class-device.
472 We support log priority levels now. The value udev_log in udev.conf is used
473 to determine what is printed to syslog. This makes it possible to
474 run a version with compiled-in debug messages in a production environment
475 which is sometimes needed to find a bug.
476 It is still possible to supress the inclusion of _any_ syslog usage with
477 USE_LOG=false to create the smallest possible binaries if needed.
478 The configured udev_log value can be overridden with the environment variable
483 Possible use of a system-wide klibc:
484 make USE_KLIBC=true KLCC=/usr/bin/klcc all
485 will link against an external klibc and our own version will be ignored.
489 We support an unlimited count of symlinks now.
491 If USE_STATIC=true is passed to a glibc build, we link statically and use
492 a built-in userdb parser to resolve user and group names.
494 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
495 we walk up the chain of physical devices to find a match.
497 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
498 easy to skip certain attribute matches without composing rules with weird
499 character class negations like:
500 KERNEL="[!s][!c][!d]*"
501 this can now be replaced with:
503 The current simple '=' is still supported, and should work as it does today,
504 but existing rules should be converted if possible, to be better readable.
506 We have new ENV{}== key now, to match against a maximum of 5 environment
509 udevstart is its own binary again, because we don't need co carry this araound
510 with every forked event.