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