3 Bugfixes and small improvements.
7 Fix path_id for recent kernels.
13 Added support for swapping network interface names, by temporarily
14 renaming the device and wait for the target name to become free.
18 The built-in MODALIAS key and substitution is removed.
22 The binary firmware helper is replaced by the usual simple
23 shell script. Udevsend is removed from the tree.
31 Some more keys require the correct use of '==' and '=' depending
32 on the kind of operation beeing an assignment or a match. Rules
33 with invalid operations are skipped and logged to syslog. Please
34 test with udevtest if the parsing of your rules throws errors and
35 fix possibly broken rules.
39 Provide "udevsettle" to wait for all current udev events to finish.
40 It also watches the current kernel netlink queue by comparing the
41 even sequence number to make sure that there are no current pending
42 events that have not already arrived in the daemon.
46 Fix rule to skip persistent rules for removable IDE devices, which
47 also skipped optical IDE drives.
49 All *_id program are installed in /lib/udev/ by default now.
51 No binary is stripped anymore as this should be done in the
52 packaging process and not at build time.
54 libvolume_id is provided as a shared library now and vol_id is
55 linked against it. Also one of the next HAL versions will require
56 this library, and the HAL build process will also require the
57 header file to be installed. The copy of the same code in HAL will
58 be removed to have only a single copy left on the system.
62 Add persistent links for SCSI tapes. The rules file is renamed
63 to 60-persistent-storage.rules.
65 Create persistent path for usb devices. Can be used for all sorts
66 of devices that can't be distinguished by other properties like
67 multiple identical keyboards and mice connected to the same box.
69 Provide "udevtrigger" program to request events on coldplug. The
70 shell script is much too slow with thousends of devices.
74 Fix persistent disk rules to exclude removable IDE drives.
76 Warn if %e, $modalias or MODALIAS is used.
80 Fix queue export, which wasn't correct for subsequent add/remove
81 events for the same device.
85 Fix cramfs detection on big endian.
87 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
92 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
93 attributes were only checked at the parent device that matched the
94 by BUS requested subsystem. Fix it to also look at the device we
95 received the event for.
97 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
102 Fix a bug where NAME="" would prevent RUN from beeing executed.
104 RUN="/bin/program" does not longer automatically add the subsystem
105 as the first parameter. This is from the days of /sbin/hotplug
106 which is dead now and it's just confusing to need to add a space at
107 the end of the program name to prevent this.
108 If you use rules that need the subsystem as the first parameter,
109 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
110 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
114 The udev man page has moved to udev(7) as it does not describe a command
115 anymore. The programs udev, udevstart and udevsend are no longer installed
116 by default and must be copied manually, if they should be installed or
117 included in a package.
119 Fix a bug where "ignore_device" could run earlier collected RUN keys before
120 the ignore rule was applied.
122 More preparation for future sysfs changes. usb_id and scsi_id no longer
123 depend on a magic order of devices in the /devices chain. Specific devices
124 should be requested by their subsytem.
126 This will always find the scsi parent device without depending on a specific
128 dev = sysfs_device_get(devpath);
129 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
131 The "device" link in the current sysfs layout will be automatically
132 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
133 parent in the devpath. If a device is requested by it's symlink, like all
134 class devices in the new sysfs layout will look like, it gets automatically
135 resolved and substituted with the real devpath and not the symlink path.
138 A similar logic must be applied to _all_ sysfs users, including
139 scripts, that search along parent devices in sysfs. The explicit use of
140 the "device" link must be avoided. With the future sysfs layout all
141 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
142 back to the "class" or the "bus". The layout of the parent devices in
143 /devices is not necessarily expected to be stable across kernel releases and
144 searching for parents by their subsystem should make sysfs users tolerant
145 for changed parent chains.
149 Prepare udev to work with the experimental kernel patch, that moves
150 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
152 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
153 moving the class devices to /sys/devices.
155 Thanks again to Marco for help finding a hopefully nice compromise
156 to make %b simpler and working again.
160 Complete removal of libsysfs, replaced by simple helper functions
161 which are much simpler and a bit faster. The udev daemon operatesentirely
162 on event parameters and does not use sysfs for simple rules anymore.
163 Please report any new bugs/problems, that may be caused by this big
164 change. They will be fixed immediately.
166 The enumeration format character '%e' is deprecated and will be
167 removed sometimes from a future udev version. It never worked correctly
168 outside of udevstart, so we can't use it with the new parallel
169 coldplug. A simple enumeration is as useless as the devfs naming
170 scheme, just get rid of both if you still use it.
172 MODALIAS and $modalias is not needed and will be removed from one of
173 the next udev versions, replace it in all rules with ENV{MODALIAS} or
174 the sysfs "modalias" value.
176 Thanks a lot to Marco for all his help on finding and fixing bugs.
180 Let scsi_id request libata drive serial numbers from page 0x80.
182 Renamed etc/udev/persistent.rules to persistent-disk.rules and
183 added /dev/disk/by-name/* for device mapper device names.
185 Removed %e from the man page. It never worked reliably outside
186 of udevstart and udevstart is no longer recommended to use.
190 Symlinks are now exported to the event environment. Hopefully it's no
191 longer needed to run udevinfo from an event process, like it was
192 mentioned on the hotplug list:
193 UDEV [1134776873.702967] add@/block/sdb
196 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
200 Fix a problem if udevsend is used as the hotplug handler and tries to use
201 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
202 and this kind of problems will hopefully go away soon.
206 All built-in logic to work around bad sysfs timing is removed with this
207 version. The need to wait for sysfs files is almost fixed with a kernel
208 version that doesn't work with this udev version anyway. Until we fix
209 the timing of the "bus" link creation, the former integrated logic should
210 be emulated by a rule placed before all other rules:
211 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
213 The option "udev_db" does no longer exist. All udev state will be in
214 /$udev_root/.udev/ now, there is no longer an option to set this
216 If the init script or something else used this value, just depend on
217 this hardcoded path. But remember _all_content_ of this directory is
218 still private to udev and can change at any time.
220 Default location for rule sripts and helper programs is now: /lib/udev/.
221 Everything that is not useful on the commandline should go into this
222 directory. Some of the helpers in the extras folder are installed there
223 now. The rules need to be changed, to find the helpers there.
225 Also /lib/udev/devices is recommended as a directory where packages or
226 the user can place real device nodes, which get copied over to /dev at
227 every boot. This should replace the various solutions with custom config
230 Udevsend does no longer start the udev daemon. This must be done with
231 the init script that prepares /dev on tmpfs and creates the initial nodes,
232 before starting the daemon.
236 Silent a too verbose error logging for the old hotplug.d/ dev.d/
239 The copy of klibc is removed. A systemwide installed version of klibc
240 should be used to build a klibc udev now.
244 NAME="" will not create any nodes, but execute RUN keys. To completely
245 ignore an event the OPTION "ignore_device" should be used.
247 After removal of the reorder queue, events with a TIMEOUT can be executed
248 without any queuing now.
252 Fixed bug in udevd, if inotify is not available. We depend on netlink
253 uevents now, kernels without that event source will not work with that
254 version of udev anymore.
258 The rule parsing happens now in the daemon once at startup, all udev
259 event processes inherit the already parsed rules from the daemon.
260 It is shipped with SUSE10.0 and reduces heavily the system load at
261 startup. The option to save precompiled rules and let the udev process
262 pick the them up is removed, as it's no longer needed.
264 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
265 device. Libsysfs is changed to "translate" the requested link into the
266 real device path, as it would happen with the hotplug event. Otherwise
267 device removal and the udev database will not work.
269 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
272 A few improvements for vol_id, the filesytem probing code.
276 Fix a stupid typo in extras/run_directory for "make install".
278 scsi_id creates the temporary devnode now in /dev for usage with a
279 non-writable /tmp directory.
281 The uevent kernel socket buffer can carry app. 50.000 events now,
282 let's see who can break this again. :)
284 The upcoming kernel will have a new input driver core integration.
285 Some class devices are now symlinks to the real device. libsysfs
286 needs a fix for this to work correctly. Udevstart of older udev
287 versions will _not_ create these devices!
291 Fix a 'install' target in the Makefile, that prevents EXTRAS from
296 A bunch of mostly trivial bugfixes. From now on no node name or
297 symlink name can contain any character than plain whitelisted ascii
298 characters or validated utf8 byte-streams. This is needed for the
299 /dev/disk/by-label/* links, because we import untrusted data and
300 export it to the filesystem.
304 More bugfixes. If udevd was started from the kernel, we don't
305 have stdin/stdout/stderr, which broke the forked tools in some
310 Bugfix. udevstart event ordering was broken for a long time.
311 The new run_program() uncovered it, because /dev/null was not
312 available while we try to run external programs.
313 Now udevstart should create it before we run anything.
317 Minor bugfixes and some distro rules updates. If you don't have the
318 persistent disk rules in /dev/disk/by-*/* on your distro, just
319 grab it from here. :)
323 We can use socket communication now to pass events from udev to
325 RUN+="socket:/org/freedesktop/hal/udev_event"
326 will pass the whole udev event to the HAL daemon without the need
327 for a forked helper. (See ChangeLog for udevmonitor, as an example)
331 Mostly bugfixes and see ChangeLog.
333 The test for the existence of an environment value should be
335 ENV{KEY}=="*" to ENV{KEY}=="?*"
336 because "*" will not fail anymore, if the key does not exist or
341 Bugfixes and a few tweaks described in the ChangeLog.
345 Mostly a Bugfix release.
347 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
348 timing with custom rules.
352 We changed the internal rule storage format. Our large rule files took
353 2 MB of RAM, with the change we are down to 99kB.
355 If the device-node has been created with default name and no symlink or
356 options are to remenber, it is not longer stored in the udevdb. HAL will
357 need to be updated to work correctly with that change.
359 To overrride optimization flags, OPTFLAGS may be used now.
367 Major changes happened with this release. The goal is to take over the
368 complete kernel-event handling and provide a more efficient way to dispatch
369 kernel events. Replacing most of the current shell script logic and the
370 kernel forked helper with a netlink-daemon and a rule-based event handling.
372 o udevd listens to netlink events now. The first valid netlink event
373 will make udevd ignore any message from udevsend that contains a
374 SEQNUM, to avoid duplicate events. The forked events can be disabled
376 echo "" > /proc/sys/kernel/hotplug
377 For full support, the broken input-subsytem needs to be fixed, not to
378 bypass the driver core.
380 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
381 removed from udev itself and must be emulated by calling small
382 helper binaries provided in the extras folder:
383 make EXTRAS=extras/run_directory/
384 will build udev_run_devd and udev_run_hotplugd, which can be called
385 from a rule if needed:
386 RUN+="/sbin/udev_run_hotplugd"
387 The recommended way to handle this is to convert all the calls from
388 the directories to explicit udev rules and get completely rid of the
389 multiplexing. (To catch a ttyUSB event, you now no longer need to
390 fork and exit 300 tty script instances you are not interested in, it
391 is just one rule that matches exactly the device.)
393 o udev handles now _all_ events not just events for class and block
394 devices, this way it is possible to control the complete event
395 behavior with udev rules. Especially useful for rules like:
396 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
398 o As used in the modalias rule, udev supports now textual
399 substitution placeholder along with the usual format chars. This
400 needs to be documented, for now it's only visible in udev_rules_parse.c.
402 o The rule keys support now more operations. This is documented in the
403 man page. It is possible to add values to list-keys like the SYMLINK
404 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
405 Also "final"-assignments are supported by using KEY:="value", which will
406 prevent changing the key by any later rule.
408 o kernel 2.6.12 has the "detached_state" attribute removed from
409 sysfs, which was used to recognize sysfs population. We switched that
410 to wait for the "bus" link, which is only available in kernels after 2.6.11.
411 Running this udev version on older kernels may cause a short delay for
414 o To provide infrastructure for persistent device naming, the id programs:
415 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
416 to export the probed data in environment key format:
417 pim:~ # /sbin/ata_id --export /dev/hda
418 ID_MODEL=HTS726060M9AT00
419 ID_SERIAL=MRH401M4G6UM9B
423 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
424 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
427 kay@pim:~> tree /dev/disk
430 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
431 | `-- IBM-Memory_Key -> ../../sda
433 | |-- swap -> ../../hda1
434 | |-- date -> ../../sda1
435 | `-- home -> ../../hda3
437 |-- 2E08712B0870F2E7 -> ../../hda3
438 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
439 |-- E845-7A89 -> ../../sda1
440 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
442 The IMPORT= operation will import these keys in the environment and make
443 it available for later PROGRAM= and RUN= executed programs. The keys are
444 also stored in the udevdb and can be queried from there with one of the
447 o A few binaries are silently added to the repository, which can be used
448 to replay kernel events from initramfs instead of using coldplug. udevd
449 can be instructed now to queue-up events while the stored events from
450 initramfs are filled into the udevd-queue. This code is still under
451 development and there is no documentation now besides the code itself.
452 The additional binaries get compiled, but are not installed by default.
454 o There is also a temporary fix for a performance problem where too many
455 events happen in parallel and every event needs to parse the rules.
456 udev can now read precompiled rules stored on disk. This is likely to be
457 replaced by a more elegant solution in a future udev version.
461 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
462 Fix for libsysfs not to expect this file was added.
466 All rules are applied now, but only the first matching rule with a NAME-key
467 will be applied. All later rules with NAME-key are completely ignored. This
468 way system supplied symlinks or permissions gets applied to user-defined
472 Please check your rules setup, if you may need to add OPTIONS="last_rule"
473 to some rules, to keep the old behavior.
475 The rules are read on "remove"-events too. That makes is possible to match
476 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
477 instruct udev to ignore an event (OPTIONS="ignore_device").
478 The new ACTION-key may be used to let a rule act only at a "remove"-event.
480 The new RUN-key supports rule-based execution of programs after device-node
481 handling. This is meant as a general replacement for the dev.d/-directories
482 to give fine grained control over the execution of programs.
484 The %s{}-sysfs format char replacement values are searched at any of the
485 devices in the device chain now, not only at the class-device.
487 We support log priority levels now. The value udev_log in udev.conf is used
488 to determine what is printed to syslog. This makes it possible to
489 run a version with compiled-in debug messages in a production environment
490 which is sometimes needed to find a bug.
491 It is still possible to supress the inclusion of _any_ syslog usage with
492 USE_LOG=false to create the smallest possible binaries if needed.
493 The configured udev_log value can be overridden with the environment variable
498 Possible use of a system-wide klibc:
499 make USE_KLIBC=true KLCC=/usr/bin/klcc all
500 will link against an external klibc and our own version will be ignored.
504 We support an unlimited count of symlinks now.
506 If USE_STATIC=true is passed to a glibc build, we link statically and use
507 a built-in userdb parser to resolve user and group names.
509 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
510 we walk up the chain of physical devices to find a match.
512 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
513 easy to skip certain attribute matches without composing rules with weird
514 character class negations like:
515 KERNEL="[!s][!c][!d]*"
516 this can now be replaced with:
518 The current simple '=' is still supported, and should work as it does today,
519 but existing rules should be converted if possible, to be better readable.
521 We have new ENV{}== key now, to match against a maximum of 5 environment
524 udevstart is its own binary again, because we don't need co carry this araound
525 with every forked event.