3 The binary firmware helper is replaced by the usual simple
4 shell script. Udevsend is removed from the tree.
12 Some more keys require the correct use of '==' and '=' depending
13 on the kind of operation beeing an assignment or a match. Rules
14 with invalid operations are skipped and logged to syslog. Please
15 test with udevtest if the parsing of your rules throws errors and
16 fix possibly broken rules.
20 Provide "udevsettle" to wait for all current udev events to finish.
21 It also watches the current kernel netlink queue by comparing the
22 even sequence number to make sure that there are no current pending
23 events that have not already arrived in the daemon.
27 Fix rule to skip persistent rules for removable IDE devices, which
28 also skipped optical IDE drives.
30 All *_id program are installed in /lib/udev/ by default now.
32 No binary is stripped anymore as this should be done in the
33 packaging process and not at build time.
35 libvolume_id is provided as a shared library now and vol_id is
36 linked against it. Also one of the next HAL versions will require
37 this library, and the HAL build process will also require the
38 header file to be installed. The copy of the same code in HAL will
39 be removed to have only a single copy left on the system.
43 Add persistent links for SCSI tapes. The rules file is renamed
44 to 60-persistent-storage.rules.
46 Create persistent path for usb devices. Can be used for all sorts
47 of devices that can't be distinguished by other properties like
48 multiple identical keyboards and mice connected to the same box.
50 Provide "udevtrigger" program to request events on coldplug. The
51 shell script is much too slow with thousends of devices.
55 Fix persistent disk rules to exclude removable IDE drives.
57 Warn if %e, $modalias or MODALIAS is used.
61 Fix queue export, which wasn't correct for subsequent add/remove
62 events for the same device.
66 Fix cramfs detection on big endian.
68 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
73 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
74 attributes were only checked at the parent device that matched the
75 by BUS requested subsystem. Fix it to also look at the device we
76 received the event for.
78 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
83 Fix a bug where NAME="" would prevent RUN from beeing executed.
85 RUN="/bin/program" does not longer automatically add the subsystem
86 as the first parameter. This is from the days of /sbin/hotplug
87 which is dead now and it's just confusing to need to add a space at
88 the end of the program name to prevent this.
89 If you use rules that need the subsystem as the first parameter,
90 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
91 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
95 The udev man page has moved to udev(7) as it does not describe a command
96 anymore. The programs udev, udevstart and udevsend are no longer installed
97 by default and must be copied manually, if they should be installed or
98 included in a package.
100 Fix a bug where "ignore_device" could run earlier collected RUN keys before
101 the ignore rule was applied.
103 More preparation for future sysfs changes. usb_id and scsi_id no longer
104 depend on a magic order of devices in the /devices chain. Specific devices
105 should be requested by their subsytem.
107 This will always find the scsi parent device without depending on a specific
109 dev = sysfs_device_get(devpath);
110 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
112 The "device" link in the current sysfs layout will be automatically
113 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
114 parent in the devpath. If a device is requested by it's symlink, like all
115 class devices in the new sysfs layout will look like, it gets automatically
116 resolved and substituted with the real devpath and not the symlink path.
119 A similar logic must be applied to _all_ sysfs users, including
120 scripts, that search along parent devices in sysfs. The explicit use of
121 the "device" link must be avoided. With the future sysfs layout all
122 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
123 back to the "class" or the "bus". The layout of the parent devices in
124 /devices is not necessarily expected to be stable across kernel releases and
125 searching for parents by their subsystem should make sysfs users tolerant
126 for changed parent chains.
130 Prepare udev to work with the experimental kernel patch, that moves
131 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
133 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
134 moving the class devices to /sys/devices.
136 Thanks again to Marco for help finding a hopefully nice compromise
137 to make %b simpler and working again.
141 Complete removal of libsysfs, replaced by simple helper functions
142 which are much simpler and a bit faster. The udev daemon operatesentirely
143 on event parameters and does not use sysfs for simple rules anymore.
144 Please report any new bugs/problems, that may be caused by this big
145 change. They will be fixed immediately.
147 The enumeration format character '%e' is deprecated and will be
148 removed sometimes from a future udev version. It never worked correctly
149 outside of udevstart, so we can't use it with the new parallel
150 coldplug. A simple enumeration is as useless as the devfs naming
151 scheme, just get rid of both if you still use it.
153 MODALIAS and $modalias is not needed and will be removed from one of
154 the next udev versions, replace it in all rules with ENV{MODALIAS} or
155 the sysfs "modalias" value.
157 Thanks a lot to Marco for all his help on finding and fixing bugs.
161 Let scsi_id request libata drive serial numbers from page 0x80.
163 Renamed etc/udev/persistent.rules to persistent-disk.rules and
164 added /dev/disk/by-name/* for device mapper device names.
166 Removed %e from the man page. It never worked reliably outside
167 of udevstart and udevstart is no longer recommended to use.
171 Symlinks are now exported to the event environment. Hopefully it's no
172 longer needed to run udevinfo from an event process, like it was
173 mentioned on the hotplug list:
174 UDEV [1134776873.702967] add@/block/sdb
177 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
181 Fix a problem if udevsend is used as the hotplug handler and tries to use
182 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
183 and this kind of problems will hopefully go away soon.
187 All built-in logic to work around bad sysfs timing is removed with this
188 version. The need to wait for sysfs files is almost fixed with a kernel
189 version that doesn't work with this udev version anyway. Until we fix
190 the timing of the "bus" link creation, the former integrated logic should
191 be emulated by a rule placed before all other rules:
192 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
194 The option "udev_db" does no longer exist. All udev state will be in
195 /$udev_root/.udev/ now, there is no longer an option to set this
197 If the init script or something else used this value, just depend on
198 this hardcoded path. But remember _all_content_ of this directory is
199 still private to udev and can change at any time.
201 Default location for rule sripts and helper programs is now: /lib/udev/.
202 Everything that is not useful on the commandline should go into this
203 directory. Some of the helpers in the extras folder are installed there
204 now. The rules need to be changed, to find the helpers there.
206 Also /lib/udev/devices is recommended as a directory where packages or
207 the user can place real device nodes, which get copied over to /dev at
208 every boot. This should replace the various solutions with custom config
211 Udevsend does no longer start the udev daemon. This must be done with
212 the init script that prepares /dev on tmpfs and creates the initial nodes,
213 before starting the daemon.
217 Silent a too verbose error logging for the old hotplug.d/ dev.d/
220 The copy of klibc is removed. A systemwide installed version of klibc
221 should be used to build a klibc udev now.
225 NAME="" will not create any nodes, but execute RUN keys. To completely
226 ignore an event the OPTION "ignore_device" should be used.
228 After removal of the reorder queue, events with a TIMEOUT can be executed
229 without any queuing now.
233 Fixed bug in udevd, if inotify is not available. We depend on netlink
234 uevents now, kernels without that event source will not work with that
235 version of udev anymore.
239 The rule parsing happens now in the daemon once at startup, all udev
240 event processes inherit the already parsed rules from the daemon.
241 It is shipped with SUSE10.0 and reduces heavily the system load at
242 startup. The option to save precompiled rules and let the udev process
243 pick the them up is removed, as it's no longer needed.
245 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
246 device. Libsysfs is changed to "translate" the requested link into the
247 real device path, as it would happen with the hotplug event. Otherwise
248 device removal and the udev database will not work.
250 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
253 A few improvements for vol_id, the filesytem probing code.
257 Fix a stupid typo in extras/run_directory for "make install".
259 scsi_id creates the temporary devnode now in /dev for usage with a
260 non-writable /tmp directory.
262 The uevent kernel socket buffer can carry app. 50.000 events now,
263 let's see who can break this again. :)
265 The upcoming kernel will have a new input driver core integration.
266 Some class devices are now symlinks to the real device. libsysfs
267 needs a fix for this to work correctly. Udevstart of older udev
268 versions will _not_ create these devices!
272 Fix a 'install' target in the Makefile, that prevents EXTRAS from
277 A bunch of mostly trivial bugfixes. From now on no node name or
278 symlink name can contain any character than plain whitelisted ascii
279 characters or validated utf8 byte-streams. This is needed for the
280 /dev/disk/by-label/* links, because we import untrusted data and
281 export it to the filesystem.
285 More bugfixes. If udevd was started from the kernel, we don't
286 have stdin/stdout/stderr, which broke the forked tools in some
291 Bugfix. udevstart event ordering was broken for a long time.
292 The new run_program() uncovered it, because /dev/null was not
293 available while we try to run external programs.
294 Now udevstart should create it before we run anything.
298 Minor bugfixes and some distro rules updates. If you don't have the
299 persistent disk rules in /dev/disk/by-*/* on your distro, just
300 grab it from here. :)
304 We can use socket communication now to pass events from udev to
306 RUN+="socket:/org/freedesktop/hal/udev_event"
307 will pass the whole udev event to the HAL daemon without the need
308 for a forked helper. (See ChangeLog for udevmonitor, as an example)
312 Mostly bugfixes and see ChangeLog.
314 The test for the existence of an environment value should be
316 ENV{KEY}=="*" to ENV{KEY}=="?*"
317 because "*" will not fail anymore, if the key does not exist or
322 Bugfixes and a few tweaks described in the ChangeLog.
326 Mostly a Bugfix release.
328 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
329 timing with custom rules.
333 We changed the internal rule storage format. Our large rule files took
334 2 MB of RAM, with the change we are down to 99kB.
336 If the device-node has been created with default name and no symlink or
337 options are to remenber, it is not longer stored in the udevdb. HAL will
338 need to be updated to work correctly with that change.
340 To overrride optimization flags, OPTFLAGS may be used now.
348 Major changes happened with this release. The goal is to take over the
349 complete kernel-event handling and provide a more efficient way to dispatch
350 kernel events. Replacing most of the current shell script logic and the
351 kernel forked helper with a netlink-daemon and a rule-based event handling.
353 o udevd listens to netlink events now. The first valid netlink event
354 will make udevd ignore any message from udevsend that contains a
355 SEQNUM, to avoid duplicate events. The forked events can be disabled
357 echo "" > /proc/sys/kernel/hotplug
358 For full support, the broken input-subsytem needs to be fixed, not to
359 bypass the driver core.
361 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
362 removed from udev itself and must be emulated by calling small
363 helper binaries provided in the extras folder:
364 make EXTRAS=extras/run_directory/
365 will build udev_run_devd and udev_run_hotplugd, which can be called
366 from a rule if needed:
367 RUN+="/sbin/udev_run_hotplugd"
368 The recommended way to handle this is to convert all the calls from
369 the directories to explicit udev rules and get completely rid of the
370 multiplexing. (To catch a ttyUSB event, you now no longer need to
371 fork and exit 300 tty script instances you are not interested in, it
372 is just one rule that matches exactly the device.)
374 o udev handles now _all_ events not just events for class and block
375 devices, this way it is possible to control the complete event
376 behavior with udev rules. Especially useful for rules like:
377 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
379 o As used in the modalias rule, udev supports now textual
380 substitution placeholder along with the usual format chars. This
381 needs to be documented, for now it's only visible in udev_rules_parse.c.
383 o The rule keys support now more operations. This is documented in the
384 man page. It is possible to add values to list-keys like the SYMLINK
385 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
386 Also "final"-assignments are supported by using KEY:="value", which will
387 prevent changing the key by any later rule.
389 o kernel 2.6.12 has the "detached_state" attribute removed from
390 sysfs, which was used to recognize sysfs population. We switched that
391 to wait for the "bus" link, which is only available in kernels after 2.6.11.
392 Running this udev version on older kernels may cause a short delay for
395 o To provide infrastructure for persistent device naming, the id programs:
396 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
397 to export the probed data in environment key format:
398 pim:~ # /sbin/ata_id --export /dev/hda
399 ID_MODEL=HTS726060M9AT00
400 ID_SERIAL=MRH401M4G6UM9B
404 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
405 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
408 kay@pim:~> tree /dev/disk
411 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
412 | `-- IBM-Memory_Key -> ../../sda
414 | |-- swap -> ../../hda1
415 | |-- date -> ../../sda1
416 | `-- home -> ../../hda3
418 |-- 2E08712B0870F2E7 -> ../../hda3
419 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
420 |-- E845-7A89 -> ../../sda1
421 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
423 The IMPORT= operation will import these keys in the environment and make
424 it available for later PROGRAM= and RUN= executed programs. The keys are
425 also stored in the udevdb and can be queried from there with one of the
428 o A few binaries are silently added to the repository, which can be used
429 to replay kernel events from initramfs instead of using coldplug. udevd
430 can be instructed now to queue-up events while the stored events from
431 initramfs are filled into the udevd-queue. This code is still under
432 development and there is no documentation now besides the code itself.
433 The additional binaries get compiled, but are not installed by default.
435 o There is also a temporary fix for a performance problem where too many
436 events happen in parallel and every event needs to parse the rules.
437 udev can now read precompiled rules stored on disk. This is likely to be
438 replaced by a more elegant solution in a future udev version.
442 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
443 Fix for libsysfs not to expect this file was added.
447 All rules are applied now, but only the first matching rule with a NAME-key
448 will be applied. All later rules with NAME-key are completely ignored. This
449 way system supplied symlinks or permissions gets applied to user-defined
453 Please check your rules setup, if you may need to add OPTIONS="last_rule"
454 to some rules, to keep the old behavior.
456 The rules are read on "remove"-events too. That makes is possible to match
457 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
458 instruct udev to ignore an event (OPTIONS="ignore_device").
459 The new ACTION-key may be used to let a rule act only at a "remove"-event.
461 The new RUN-key supports rule-based execution of programs after device-node
462 handling. This is meant as a general replacement for the dev.d/-directories
463 to give fine grained control over the execution of programs.
465 The %s{}-sysfs format char replacement values are searched at any of the
466 devices in the device chain now, not only at the class-device.
468 We support log priority levels now. The value udev_log in udev.conf is used
469 to determine what is printed to syslog. This makes it possible to
470 run a version with compiled-in debug messages in a production environment
471 which is sometimes needed to find a bug.
472 It is still possible to supress the inclusion of _any_ syslog usage with
473 USE_LOG=false to create the smallest possible binaries if needed.
474 The configured udev_log value can be overridden with the environment variable
479 Possible use of a system-wide klibc:
480 make USE_KLIBC=true KLCC=/usr/bin/klcc all
481 will link against an external klibc and our own version will be ignored.
485 We support an unlimited count of symlinks now.
487 If USE_STATIC=true is passed to a glibc build, we link statically and use
488 a built-in userdb parser to resolve user and group names.
490 The PLACE= key is gone. It can be replaced by an ID= for a long time, because
491 we walk up the chain of physical devices to find a match.
493 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
494 easy to skip certain attribute matches without composing rules with weird
495 character class negations like:
496 KERNEL="[!s][!c][!d]*"
497 this can now be replaced with:
499 The current simple '=' is still supported, and should work as it does today,
500 but existing rules should be converted if possible, to be better readable.
502 We have new ENV{}== key now, to match against a maximum of 5 environment
505 udevstart is its own binary again, because we don't need co carry this araound
506 with every forked event.