3 fix path_id for recent kernels
9 Added support for swapping network interface names, by temporarily
10 renaming the device and wait for the target name to become free.
14 The built-in MODALIAS key and substitution is removed.
18 The binary firmware helper is replaced by the usual simple
19 shell script. Udevsend is removed from the tree.
27 Some more keys require the correct use of '==' and '=' depending
28 on the kind of operation beeing an assignment or a match. Rules
29 with invalid operations are skipped and logged to syslog. Please
30 test with udevtest if the parsing of your rules throws errors and
31 fix possibly broken rules.
35 Provide "udevsettle" to wait for all current udev events to finish.
36 It also watches the current kernel netlink queue by comparing the
37 even sequence number to make sure that there are no current pending
38 events that have not already arrived in the daemon.
42 Fix rule to skip persistent rules for removable IDE devices, which
43 also skipped optical IDE drives.
45 All *_id program are installed in /lib/udev/ by default now.
47 No binary is stripped anymore as this should be done in the
48 packaging process and not at build time.
50 libvolume_id is provided as a shared library now and vol_id is
51 linked against it. Also one of the next HAL versions will require
52 this library, and the HAL build process will also require the
53 header file to be installed. The copy of the same code in HAL will
54 be removed to have only a single copy left on the system.
58 Add persistent links for SCSI tapes. The rules file is renamed
59 to 60-persistent-storage.rules.
61 Create persistent path for usb devices. Can be used for all sorts
62 of devices that can't be distinguished by other properties like
63 multiple identical keyboards and mice connected to the same box.
65 Provide "udevtrigger" program to request events on coldplug. The
66 shell script is much too slow with thousends of devices.
70 Fix persistent disk rules to exclude removable IDE drives.
72 Warn if %e, $modalias or MODALIAS is used.
76 Fix queue export, which wasn't correct for subsequent add/remove
77 events for the same device.
81 Fix cramfs detection on big endian.
83 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
88 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
89 attributes were only checked at the parent device that matched the
90 by BUS requested subsystem. Fix it to also look at the device we
91 received the event for.
93 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
98 Fix a bug where NAME="" would prevent RUN from beeing executed.
100 RUN="/bin/program" does not longer automatically add the subsystem
101 as the first parameter. This is from the days of /sbin/hotplug
102 which is dead now and it's just confusing to need to add a space at
103 the end of the program name to prevent this.
104 If you use rules that need the subsystem as the first parameter,
105 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
106 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
110 The udev man page has moved to udev(7) as it does not describe a command
111 anymore. The programs udev, udevstart and udevsend are no longer installed
112 by default and must be copied manually, if they should be installed or
113 included in a package.
115 Fix a bug where "ignore_device" could run earlier collected RUN keys before
116 the ignore rule was applied.
118 More preparation for future sysfs changes. usb_id and scsi_id no longer
119 depend on a magic order of devices in the /devices chain. Specific devices
120 should be requested by their subsytem.
122 This will always find the scsi parent device without depending on a specific
124 dev = sysfs_device_get(devpath);
125 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
127 The "device" link in the current sysfs layout will be automatically
128 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
129 parent in the devpath. If a device is requested by it's symlink, like all
130 class devices in the new sysfs layout will look like, it gets automatically
131 resolved and substituted with the real devpath and not the symlink path.
134 A similar logic must be applied to _all_ sysfs users, including
135 scripts, that search along parent devices in sysfs. The explicit use of
136 the "device" link must be avoided. With the future sysfs layout all
137 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
138 back to the "class" or the "bus". The layout of the parent devices in
139 /devices is not necessarily expected to be stable across kernel releases and
140 searching for parents by their subsystem should make sysfs users tolerant
141 for changed parent chains.
145 Prepare udev to work with the experimental kernel patch, that moves
146 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
148 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
149 moving the class devices to /sys/devices.
151 Thanks again to Marco for help finding a hopefully nice compromise
152 to make %b simpler and working again.
156 Complete removal of libsysfs, replaced by simple helper functions
157 which are much simpler and a bit faster. The udev daemon operatesentirely
158 on event parameters and does not use sysfs for simple rules anymore.
159 Please report any new bugs/problems, that may be caused by this big
160 change. They will be fixed immediately.
162 The enumeration format character '%e' is deprecated and will be
163 removed sometimes from a future udev version. It never worked correctly
164 outside of udevstart, so we can't use it with the new parallel
165 coldplug. A simple enumeration is as useless as the devfs naming
166 scheme, just get rid of both if you still use it.
168 MODALIAS and $modalias is not needed and will be removed from one of
169 the next udev versions, replace it in all rules with ENV{MODALIAS} or
170 the sysfs "modalias" value.
172 Thanks a lot to Marco for all his help on finding and fixing bugs.
176 Let scsi_id request libata drive serial numbers from page 0x80.
178 Renamed etc/udev/persistent.rules to persistent-disk.rules and
179 added /dev/disk/by-name/* for device mapper device names.
181 Removed %e from the man page. It never worked reliably outside
182 of udevstart and udevstart is no longer recommended to use.
186 Symlinks are now exported to the event environment. Hopefully it's no
187 longer needed to run udevinfo from an event process, like it was
188 mentioned on the hotplug list:
189 UDEV [1134776873.702967] add@/block/sdb
192 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
196 Fix a problem if udevsend is used as the hotplug handler and tries to use
197 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
198 and this kind of problems will hopefully go away soon.
202 All built-in logic to work around bad sysfs timing is removed with this
203 version. The need to wait for sysfs files is almost fixed with a kernel
204 version that doesn't work with this udev version anyway. Until we fix
205 the timing of the "bus" link creation, the former integrated logic should
206 be emulated by a rule placed before all other rules:
207 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
209 The option "udev_db" does no longer exist. All udev state will be in
210 /$udev_root/.udev/ now, there is no longer an option to set this
212 If the init script or something else used this value, just depend on
213 this hardcoded path. But remember _all_content_ of this directory is
214 still private to udev and can change at any time.
216 Default location for rule sripts and helper programs is now: /lib/udev/.
217 Everything that is not useful on the commandline should go into this
218 directory. Some of the helpers in the extras folder are installed there
219 now. The rules need to be changed, to find the helpers there.
221 Also /lib/udev/devices is recommended as a directory where packages or
222 the user can place real device nodes, which get copied over to /dev at
223 every boot. This should replace the various solutions with custom config
226 Udevsend does no longer start the udev daemon. This must be done with
227 the init script that prepares /dev on tmpfs and creates the initial nodes,
228 before starting the daemon.
232 Silent a too verbose error logging for the old hotplug.d/ dev.d/
235 The copy of klibc is removed. A systemwide installed version of klibc
236 should be used to build a klibc udev now.
240 NAME="" will not create any nodes, but execute RUN keys. To completely
241 ignore an event the OPTION "ignore_device" should be used.
243 After removal of the reorder queue, events with a TIMEOUT can be executed
244 without any queuing now.
248 Fixed bug in udevd, if inotify is not available. We depend on netlink
249 uevents now, kernels without that event source will not work with that
250 version of udev anymore.
254 The rule parsing happens now in the daemon once at startup, all udev
255 event processes inherit the already parsed rules from the daemon.
256 It is shipped with SUSE10.0 and reduces heavily the system load at
257 startup. The option to save precompiled rules and let the udev process
258 pick the them up is removed, as it's no longer needed.
260 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
261 device. Libsysfs is changed to "translate" the requested link into the
262 real device path, as it would happen with the hotplug event. Otherwise
263 device removal and the udev database will not work.
265 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
268 A few improvements for vol_id, the filesytem probing code.
272 Fix a stupid typo in extras/run_directory for "make install".
274 scsi_id creates the temporary devnode now in /dev for usage with a
275 non-writable /tmp directory.
277 The uevent kernel socket buffer can carry app. 50.000 events now,
278 let's see who can break this again. :)
280 The upcoming kernel will have a new input driver core integration.
281 Some class devices are now symlinks to the real device. libsysfs
282 needs a fix for this to work correctly. Udevstart of older udev
283 versions will _not_ create these devices!
287 Fix a 'install' target in the Makefile, that prevents EXTRAS from
292 A bunch of mostly trivial bugfixes. From now on no node name or
293 symlink name can contain any character than plain whitelisted ascii
294 characters or validated utf8 byte-streams. This is needed for the
295 /dev/disk/by-label/* links, because we import untrusted data and
296 export it to the filesystem.
300 More bugfixes. If udevd was started from the kernel, we don't
301 have stdin/stdout/stderr, which broke the forked tools in some
306 Bugfix. udevstart event ordering was broken for a long time.
307 The new run_program() uncovered it, because /dev/null was not
308 available while we try to run external programs.
309 Now udevstart should create it before we run anything.
313 Minor bugfixes and some distro rules updates. If you don't have the
314 persistent disk rules in /dev/disk/by-*/* on your distro, just
315 grab it from here. :)
319 We can use socket communication now to pass events from udev to
321 RUN+="socket:/org/freedesktop/hal/udev_event"
322 will pass the whole udev event to the HAL daemon without the need
323 for a forked helper. (See ChangeLog for udevmonitor, as an example)
327 Mostly bugfixes and see ChangeLog.
329 The test for the existence of an environment value should be
331 ENV{KEY}=="*" to ENV{KEY}=="?*"
332 because "*" will not fail anymore, if the key does not exist or
337 Bugfixes and a few tweaks described in the ChangeLog.
341 Mostly a Bugfix release.
343 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
344 timing with custom rules.
348 We changed the internal rule storage format. Our large rule files took
349 2 MB of RAM, with the change we are down to 99kB.
351 If the device-node has been created with default name and no symlink or
352 options are to remenber, it is not longer stored in the udevdb. HAL will
353 need to be updated to work correctly with that change.
355 To overrride optimization flags, OPTFLAGS may be used now.
363 Major changes happened with this release. The goal is to take over the
364 complete kernel-event handling and provide a more efficient way to dispatch
365 kernel events. Replacing most of the current shell script logic and the
366 kernel forked helper with a netlink-daemon and a rule-based event handling.
368 o udevd listens to netlink events now. The first valid netlink event
369 will make udevd ignore any message from udevsend that contains a
370 SEQNUM, to avoid duplicate events. The forked events can be disabled
372 echo "" > /proc/sys/kernel/hotplug
373 For full support, the broken input-subsytem needs to be fixed, not to
374 bypass the driver core.
376 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
377 removed from udev itself and must be emulated by calling small
378 helper binaries provided in the extras folder:
379 make EXTRAS=extras/run_directory/
380 will build udev_run_devd and udev_run_hotplugd, which can be called
381 from a rule if needed:
382 RUN+="/sbin/udev_run_hotplugd"
383 The recommended way to handle this is to convert all the calls from
384 the directories to explicit udev rules and get completely rid of the
385 multiplexing. (To catch a ttyUSB event, you now no longer need to
386 fork and exit 300 tty script instances you are not interested in, it
387 is just one rule that matches exactly the device.)
389 o udev handles now _all_ events not just events for class and block
390 devices, this way it is possible to control the complete event
391 behavior with udev rules. Especially useful for rules like:
392 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
394 o As used in the modalias rule, udev supports now textual
395 substitution placeholder along with the usual format chars. This
396 needs to be documented, for now it's only visible in udev_rules_parse.c.
398 o The rule keys support now more operations. This is documented in the
399 man page. It is possible to add values to list-keys like the SYMLINK
400 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
401 Also "final"-assignments are supported by using KEY:="value", which will
402 prevent changing the key by any later rule.
404 o kernel 2.6.12 has the "detached_state" attribute removed from
405 sysfs, which was used to recognize sysfs population. We switched that
406 to wait for the "bus" link, which is only available in kernels after 2.6.11.
407 Running this udev version on older kernels may cause a short delay for
410 o To provide infrastructure for persistent device naming, the id programs:
411 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
412 to export the probed data in environment key format:
413 pim:~ # /sbin/ata_id --export /dev/hda
414 ID_MODEL=HTS726060M9AT00
415 ID_SERIAL=MRH401M4G6UM9B
419 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
420 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
423 kay@pim:~> tree /dev/disk
426 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
427 | `-- IBM-Memory_Key -> ../../sda
429 | |-- swap -> ../../hda1
430 | |-- date -> ../../sda1
431 | `-- home -> ../../hda3
433 |-- 2E08712B0870F2E7 -> ../../hda3
434 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
435 |-- E845-7A89 -> ../../sda1
436 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
438 The IMPORT= operation will import these keys in the environment and make
439 it available for later PROGRAM= and RUN= executed programs. The keys are
440 also stored in the udevdb and can be queried from there with one of the
443 o A few binaries are silently added to the repository, which can be used
444 to replay kernel events from initramfs instead of using coldplug. udevd
445 can be instructed now to queue-up events while the stored events from
446 initramfs are filled into the udevd-queue. This code is still under
447 development and there is no documentation now besides the code itself.
448 The additional binaries get compiled, but are not installed by default.
450 o There is also a temporary fix for a performance problem where too many
451 events happen in parallel and every event needs to parse the rules.
452 udev can now read precompiled rules stored on disk. This is likely to be
453 replaced by a more elegant solution in a future udev version.
457 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
458 Fix for libsysfs not to expect this file was added.
462 All rules are applied now, but only the first matching rule with a NAME-key
463 will be applied. All later rules with NAME-key are completely ignored. This
464 way system supplied symlinks or permissions gets applied to user-defined
468 Please check your rules setup, if you may need to add OPTIONS="last_rule"
469 to some rules, to keep the old behavior.
471 The rules are read on "remove"-events too. That makes is possible to match
472 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
473 instruct udev to ignore an event (OPTIONS="ignore_device").
474 The new ACTION-key may be used to let a rule act only at a "remove"-event.
476 The new RUN-key supports rule-based execution of programs after device-node
477 handling. This is meant as a general replacement for the dev.d/-directories
478 to give fine grained control over the execution of programs.
480 The %s{}-sysfs format char replacement values are searched at any of the
481 devices in the device chain now, not only at the class-device.
483 We support log priority levels now. The value udev_log in udev.conf is used
484 to determine what is printed to syslog. This makes it possible to
485 run a version with compiled-in debug messages in a production environment
486 which is sometimes needed to find a bug.
487 It is still possible to supress the inclusion of _any_ syslog usage with
488 USE_LOG=false to create the smallest possible binaries if needed.
489 The configured udev_log value can be overridden with the environment variable
494 Possible use of a system-wide klibc:
495 make USE_KLIBC=true KLCC=/usr/bin/klcc all
496 will link against an external klibc and our own version will be ignored.
500 We support an unlimited count of symlinks now.
502 If USE_STATIC=true is passed to a glibc build, we link statically and use
503 a built-in userdb parser to resolve user and group names.
505 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
506 we walk up the chain of physical devices to find a match.
508 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
509 easy to skip certain attribute matches without composing rules with weird
510 character class negations like:
511 KERNEL="[!s][!c][!d]*"
512 this can now be replaced with:
514 The current simple '=' is still supported, and should work as it does today,
515 but existing rules should be converted if possible, to be better readable.
517 We have new ENV{}== key now, to match against a maximum of 5 environment
520 udevstart is its own binary again, because we don't need co carry this araound
521 with every forked event.