5 Added support for swapping network interface names, by temporarily
6 renaming the device and wait for the target name to become free.
10 The built-in MODALIAS key and substitution is removed.
14 The binary firmware helper is replaced by the usual simple
15 shell script. Udevsend is removed from the tree.
23 Some more keys require the correct use of '==' and '=' depending
24 on the kind of operation beeing an assignment or a match. Rules
25 with invalid operations are skipped and logged to syslog. Please
26 test with udevtest if the parsing of your rules throws errors and
27 fix possibly broken rules.
31 Provide "udevsettle" to wait for all current udev events to finish.
32 It also watches the current kernel netlink queue by comparing the
33 even sequence number to make sure that there are no current pending
34 events that have not already arrived in the daemon.
38 Fix rule to skip persistent rules for removable IDE devices, which
39 also skipped optical IDE drives.
41 All *_id program are installed in /lib/udev/ by default now.
43 No binary is stripped anymore as this should be done in the
44 packaging process and not at build time.
46 libvolume_id is provided as a shared library now and vol_id is
47 linked against it. Also one of the next HAL versions will require
48 this library, and the HAL build process will also require the
49 header file to be installed. The copy of the same code in HAL will
50 be removed to have only a single copy left on the system.
54 Add persistent links for SCSI tapes. The rules file is renamed
55 to 60-persistent-storage.rules.
57 Create persistent path for usb devices. Can be used for all sorts
58 of devices that can't be distinguished by other properties like
59 multiple identical keyboards and mice connected to the same box.
61 Provide "udevtrigger" program to request events on coldplug. The
62 shell script is much too slow with thousends of devices.
66 Fix persistent disk rules to exclude removable IDE drives.
68 Warn if %e, $modalias or MODALIAS is used.
72 Fix queue export, which wasn't correct for subsequent add/remove
73 events for the same device.
77 Fix cramfs detection on big endian.
79 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
84 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
85 attributes were only checked at the parent device that matched the
86 by BUS requested subsystem. Fix it to also look at the device we
87 received the event for.
89 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
94 Fix a bug where NAME="" would prevent RUN from beeing executed.
96 RUN="/bin/program" does not longer automatically add the subsystem
97 as the first parameter. This is from the days of /sbin/hotplug
98 which is dead now and it's just confusing to need to add a space at
99 the end of the program name to prevent this.
100 If you use rules that need the subsystem as the first parameter,
101 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
102 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
106 The udev man page has moved to udev(7) as it does not describe a command
107 anymore. The programs udev, udevstart and udevsend are no longer installed
108 by default and must be copied manually, if they should be installed or
109 included in a package.
111 Fix a bug where "ignore_device" could run earlier collected RUN keys before
112 the ignore rule was applied.
114 More preparation for future sysfs changes. usb_id and scsi_id no longer
115 depend on a magic order of devices in the /devices chain. Specific devices
116 should be requested by their subsytem.
118 This will always find the scsi parent device without depending on a specific
120 dev = sysfs_device_get(devpath);
121 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
123 The "device" link in the current sysfs layout will be automatically
124 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
125 parent in the devpath. If a device is requested by it's symlink, like all
126 class devices in the new sysfs layout will look like, it gets automatically
127 resolved and substituted with the real devpath and not the symlink path.
130 A similar logic must be applied to _all_ sysfs users, including
131 scripts, that search along parent devices in sysfs. The explicit use of
132 the "device" link must be avoided. With the future sysfs layout all
133 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
134 back to the "class" or the "bus". The layout of the parent devices in
135 /devices is not necessarily expected to be stable across kernel releases and
136 searching for parents by their subsystem should make sysfs users tolerant
137 for changed parent chains.
141 Prepare udev to work with the experimental kernel patch, that moves
142 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
144 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
145 moving the class devices to /sys/devices.
147 Thanks again to Marco for help finding a hopefully nice compromise
148 to make %b simpler and working again.
152 Complete removal of libsysfs, replaced by simple helper functions
153 which are much simpler and a bit faster. The udev daemon operatesentirely
154 on event parameters and does not use sysfs for simple rules anymore.
155 Please report any new bugs/problems, that may be caused by this big
156 change. They will be fixed immediately.
158 The enumeration format character '%e' is deprecated and will be
159 removed sometimes from a future udev version. It never worked correctly
160 outside of udevstart, so we can't use it with the new parallel
161 coldplug. A simple enumeration is as useless as the devfs naming
162 scheme, just get rid of both if you still use it.
164 MODALIAS and $modalias is not needed and will be removed from one of
165 the next udev versions, replace it in all rules with ENV{MODALIAS} or
166 the sysfs "modalias" value.
168 Thanks a lot to Marco for all his help on finding and fixing bugs.
172 Let scsi_id request libata drive serial numbers from page 0x80.
174 Renamed etc/udev/persistent.rules to persistent-disk.rules and
175 added /dev/disk/by-name/* for device mapper device names.
177 Removed %e from the man page. It never worked reliably outside
178 of udevstart and udevstart is no longer recommended to use.
182 Symlinks are now exported to the event environment. Hopefully it's no
183 longer needed to run udevinfo from an event process, like it was
184 mentioned on the hotplug list:
185 UDEV [1134776873.702967] add@/block/sdb
188 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
192 Fix a problem if udevsend is used as the hotplug handler and tries to use
193 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
194 and this kind of problems will hopefully go away soon.
198 All built-in logic to work around bad sysfs timing is removed with this
199 version. The need to wait for sysfs files is almost fixed with a kernel
200 version that doesn't work with this udev version anyway. Until we fix
201 the timing of the "bus" link creation, the former integrated logic should
202 be emulated by a rule placed before all other rules:
203 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
205 The option "udev_db" does no longer exist. All udev state will be in
206 /$udev_root/.udev/ now, there is no longer an option to set this
208 If the init script or something else used this value, just depend on
209 this hardcoded path. But remember _all_content_ of this directory is
210 still private to udev and can change at any time.
212 Default location for rule sripts and helper programs is now: /lib/udev/.
213 Everything that is not useful on the commandline should go into this
214 directory. Some of the helpers in the extras folder are installed there
215 now. The rules need to be changed, to find the helpers there.
217 Also /lib/udev/devices is recommended as a directory where packages or
218 the user can place real device nodes, which get copied over to /dev at
219 every boot. This should replace the various solutions with custom config
222 Udevsend does no longer start the udev daemon. This must be done with
223 the init script that prepares /dev on tmpfs and creates the initial nodes,
224 before starting the daemon.
228 Silent a too verbose error logging for the old hotplug.d/ dev.d/
231 The copy of klibc is removed. A systemwide installed version of klibc
232 should be used to build a klibc udev now.
236 NAME="" will not create any nodes, but execute RUN keys. To completely
237 ignore an event the OPTION "ignore_device" should be used.
239 After removal of the reorder queue, events with a TIMEOUT can be executed
240 without any queuing now.
244 Fixed bug in udevd, if inotify is not available. We depend on netlink
245 uevents now, kernels without that event source will not work with that
246 version of udev anymore.
250 The rule parsing happens now in the daemon once at startup, all udev
251 event processes inherit the already parsed rules from the daemon.
252 It is shipped with SUSE10.0 and reduces heavily the system load at
253 startup. The option to save precompiled rules and let the udev process
254 pick the them up is removed, as it's no longer needed.
256 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
257 device. Libsysfs is changed to "translate" the requested link into the
258 real device path, as it would happen with the hotplug event. Otherwise
259 device removal and the udev database will not work.
261 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
264 A few improvements for vol_id, the filesytem probing code.
268 Fix a stupid typo in extras/run_directory for "make install".
270 scsi_id creates the temporary devnode now in /dev for usage with a
271 non-writable /tmp directory.
273 The uevent kernel socket buffer can carry app. 50.000 events now,
274 let's see who can break this again. :)
276 The upcoming kernel will have a new input driver core integration.
277 Some class devices are now symlinks to the real device. libsysfs
278 needs a fix for this to work correctly. Udevstart of older udev
279 versions will _not_ create these devices!
283 Fix a 'install' target in the Makefile, that prevents EXTRAS from
288 A bunch of mostly trivial bugfixes. From now on no node name or
289 symlink name can contain any character than plain whitelisted ascii
290 characters or validated utf8 byte-streams. This is needed for the
291 /dev/disk/by-label/* links, because we import untrusted data and
292 export it to the filesystem.
296 More bugfixes. If udevd was started from the kernel, we don't
297 have stdin/stdout/stderr, which broke the forked tools in some
302 Bugfix. udevstart event ordering was broken for a long time.
303 The new run_program() uncovered it, because /dev/null was not
304 available while we try to run external programs.
305 Now udevstart should create it before we run anything.
309 Minor bugfixes and some distro rules updates. If you don't have the
310 persistent disk rules in /dev/disk/by-*/* on your distro, just
311 grab it from here. :)
315 We can use socket communication now to pass events from udev to
317 RUN+="socket:/org/freedesktop/hal/udev_event"
318 will pass the whole udev event to the HAL daemon without the need
319 for a forked helper. (See ChangeLog for udevmonitor, as an example)
323 Mostly bugfixes and see ChangeLog.
325 The test for the existence of an environment value should be
327 ENV{KEY}=="*" to ENV{KEY}=="?*"
328 because "*" will not fail anymore, if the key does not exist or
333 Bugfixes and a few tweaks described in the ChangeLog.
337 Mostly a Bugfix release.
339 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
340 timing with custom rules.
344 We changed the internal rule storage format. Our large rule files took
345 2 MB of RAM, with the change we are down to 99kB.
347 If the device-node has been created with default name and no symlink or
348 options are to remenber, it is not longer stored in the udevdb. HAL will
349 need to be updated to work correctly with that change.
351 To overrride optimization flags, OPTFLAGS may be used now.
359 Major changes happened with this release. The goal is to take over the
360 complete kernel-event handling and provide a more efficient way to dispatch
361 kernel events. Replacing most of the current shell script logic and the
362 kernel forked helper with a netlink-daemon and a rule-based event handling.
364 o udevd listens to netlink events now. The first valid netlink event
365 will make udevd ignore any message from udevsend that contains a
366 SEQNUM, to avoid duplicate events. The forked events can be disabled
368 echo "" > /proc/sys/kernel/hotplug
369 For full support, the broken input-subsytem needs to be fixed, not to
370 bypass the driver core.
372 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
373 removed from udev itself and must be emulated by calling small
374 helper binaries provided in the extras folder:
375 make EXTRAS=extras/run_directory/
376 will build udev_run_devd and udev_run_hotplugd, which can be called
377 from a rule if needed:
378 RUN+="/sbin/udev_run_hotplugd"
379 The recommended way to handle this is to convert all the calls from
380 the directories to explicit udev rules and get completely rid of the
381 multiplexing. (To catch a ttyUSB event, you now no longer need to
382 fork and exit 300 tty script instances you are not interested in, it
383 is just one rule that matches exactly the device.)
385 o udev handles now _all_ events not just events for class and block
386 devices, this way it is possible to control the complete event
387 behavior with udev rules. Especially useful for rules like:
388 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
390 o As used in the modalias rule, udev supports now textual
391 substitution placeholder along with the usual format chars. This
392 needs to be documented, for now it's only visible in udev_rules_parse.c.
394 o The rule keys support now more operations. This is documented in the
395 man page. It is possible to add values to list-keys like the SYMLINK
396 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
397 Also "final"-assignments are supported by using KEY:="value", which will
398 prevent changing the key by any later rule.
400 o kernel 2.6.12 has the "detached_state" attribute removed from
401 sysfs, which was used to recognize sysfs population. We switched that
402 to wait for the "bus" link, which is only available in kernels after 2.6.11.
403 Running this udev version on older kernels may cause a short delay for
406 o To provide infrastructure for persistent device naming, the id programs:
407 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
408 to export the probed data in environment key format:
409 pim:~ # /sbin/ata_id --export /dev/hda
410 ID_MODEL=HTS726060M9AT00
411 ID_SERIAL=MRH401M4G6UM9B
415 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
416 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
419 kay@pim:~> tree /dev/disk
422 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
423 | `-- IBM-Memory_Key -> ../../sda
425 | |-- swap -> ../../hda1
426 | |-- date -> ../../sda1
427 | `-- home -> ../../hda3
429 |-- 2E08712B0870F2E7 -> ../../hda3
430 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
431 |-- E845-7A89 -> ../../sda1
432 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
434 The IMPORT= operation will import these keys in the environment and make
435 it available for later PROGRAM= and RUN= executed programs. The keys are
436 also stored in the udevdb and can be queried from there with one of the
439 o A few binaries are silently added to the repository, which can be used
440 to replay kernel events from initramfs instead of using coldplug. udevd
441 can be instructed now to queue-up events while the stored events from
442 initramfs are filled into the udevd-queue. This code is still under
443 development and there is no documentation now besides the code itself.
444 The additional binaries get compiled, but are not installed by default.
446 o There is also a temporary fix for a performance problem where too many
447 events happen in parallel and every event needs to parse the rules.
448 udev can now read precompiled rules stored on disk. This is likely to be
449 replaced by a more elegant solution in a future udev version.
453 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
454 Fix for libsysfs not to expect this file was added.
458 All rules are applied now, but only the first matching rule with a NAME-key
459 will be applied. All later rules with NAME-key are completely ignored. This
460 way system supplied symlinks or permissions gets applied to user-defined
464 Please check your rules setup, if you may need to add OPTIONS="last_rule"
465 to some rules, to keep the old behavior.
467 The rules are read on "remove"-events too. That makes is possible to match
468 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
469 instruct udev to ignore an event (OPTIONS="ignore_device").
470 The new ACTION-key may be used to let a rule act only at a "remove"-event.
472 The new RUN-key supports rule-based execution of programs after device-node
473 handling. This is meant as a general replacement for the dev.d/-directories
474 to give fine grained control over the execution of programs.
476 The %s{}-sysfs format char replacement values are searched at any of the
477 devices in the device chain now, not only at the class-device.
479 We support log priority levels now. The value udev_log in udev.conf is used
480 to determine what is printed to syslog. This makes it possible to
481 run a version with compiled-in debug messages in a production environment
482 which is sometimes needed to find a bug.
483 It is still possible to supress the inclusion of _any_ syslog usage with
484 USE_LOG=false to create the smallest possible binaries if needed.
485 The configured udev_log value can be overridden with the environment variable
490 Possible use of a system-wide klibc:
491 make USE_KLIBC=true KLCC=/usr/bin/klcc all
492 will link against an external klibc and our own version will be ignored.
496 We support an unlimited count of symlinks now.
498 If USE_STATIC=true is passed to a glibc build, we link statically and use
499 a built-in userdb parser to resolve user and group names.
501 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
502 we walk up the chain of physical devices to find a match.
504 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
505 easy to skip certain attribute matches without composing rules with weird
506 character class negations like:
507 KERNEL="[!s][!c][!d]*"
508 this can now be replaced with:
510 The current simple '=' is still supported, and should work as it does today,
511 but existing rules should be converted if possible, to be better readable.
513 We have new ENV{}== key now, to match against a maximum of 5 environment
516 udevstart is its own binary again, because we don't need co carry this araound
517 with every forked event.