3 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
4 attributes were only checked at the parent device that matched the
5 by BUS requested subsystem. Fix it to also look at the device we
6 received the event for.
8 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
13 Fix a bug where NAME="" would prevent RUN from beeing executed.
15 RUN="/bin/program" does not longer automatically add the subsystem
16 as the first parameter. This is from the days of /sbin/hotplug
17 which is dead now and it's just confusing to need to add a space at
18 the end of the program name to prevent this.
19 If you use rules that need the subsystem as the first parameter,
20 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
21 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
25 The udev man page has moved to udev(7) as it does not describe a command
26 anymore. The programs udev, udevstart and udevsend are no longer installed
27 by default and must be copied manually, if they should be installed or
28 included in a package.
30 Fix a bug where "ignore_device" could run earlier collected RUN keys before
31 the ignore rule was applied.
33 More preparation for future sysfs changes. usb_id and scsi_id no longer
34 depend on a magic order of devices in the /devices chain. Specific devices
35 should be requested by their subsytem.
37 This will always find the scsi parent device without depending on a specific
39 dev = sysfs_device_get(devpath);
40 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
42 The "device" link in the current sysfs layout will be automatically
43 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
44 parent in the devpath. If a device is requested by it's symlink, like all
45 class devices in the new sysfs layout will look like, it gets automatically
46 resolved and substituted with the real devpath and not the symlink path.
49 A similar logic must be applied to _all_ sysfs users, including
50 scripts, that search along parent devices in sysfs. The explicit use of
51 the "device" link must be avoided. With the future sysfs layout all
52 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
53 back to the "class" or the "bus". The layout of the parent devices in
54 /devices is not necessarily expected to be stable across kernel releases and
55 searching for parents by their subsystem should make sysfs users tolerant
56 for changed parent chains.
60 Prepare udev to work with the experimental kernel patch, that moves
61 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
63 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
64 moving the class devices to /sys/devices.
66 Thanks again to Marco for help finding a hopefully nice compromise
67 to make %b simpler and working again.
71 Complete removal of libsysfs, replaced by simple helper functions
72 which are much simpler and a bit faster. The udev daemon operatesentirely
73 on event parameters and does not use sysfs for simple rules anymore.
74 Please report any new bugs/problems, that may be caused by this big
75 change. They will be fixed immediately.
77 The enumeration format character '%e' is deprecated and will be
78 removed sometimes from a future udev version. It never worked correctly
79 outside of udevstart, so we can't use it with the new parallel
80 coldplug. A simple enumeration is as useless as the devfs naming
81 scheme, just get rid of both if you still use it.
83 MODALIAS and $modalias is not needed and will be removed from one of
84 the next udev versions, replace it in all rules with ENV{MODALIAS} or
85 the sysfs "modalias" value.
87 Thanks a lot to Marco for all his help on finding and fixing bugs.
91 Let scsi_id request libata drive serial numbers from page 0x80.
93 Renamed etc/udev/persistent.rules to persistent-disk.rules and
94 added /dev/disk/by-name/* for device mapper device names.
96 Removed %e from the man page. It never worked reliably outside
97 of udevstart and udevstart is no longer recommended to use.
101 Symlinks are now exported to the event environment. Hopefully it's no
102 longer needed to run udevinfo from an event process, like it was
103 mentioned on the hotplug list:
104 UDEV [1134776873.702967] add@/block/sdb
107 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
111 Fix a problem if udevsend is used as the hotplug handler and tries to use
112 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
113 and this kind of problems will hopefully go away soon.
117 All built-in logic to work around bad sysfs timing is removed with this
118 version. The need to wait for sysfs files is almost fixed with a kernel
119 version that doesn't work with this udev version anyway. Until we fix
120 the timing of the "bus" link creation, the former integrated logic should
121 be emulated by a rule placed before all other rules:
122 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
124 The option "udev_db" does no longer exist. All udev state will be in
125 /$udev_root/.udev/ now, there is no longer an option to set this
127 If the init script or something else used this value, just depend on
128 this hardcoded path. But remember _all_content_ of this directory is
129 still private to udev and can change at any time.
131 Default location for rule sripts and helper programs is now: /lib/udev/.
132 Everything that is not useful on the commandline should go into this
133 directory. Some of the helpers in the extras folder are installed there
134 now. The rules need to be changed, to find the helpers there.
136 Also /lib/udev/devices is recommended as a directory where packages or
137 the user can place real device nodes, which get copied over to /dev at
138 every boot. This should replace the various solutions with custom config
141 Udevsend does no longer start the udev daemon. This must be done with
142 the init script that prepares /dev on tmpfs and creates the initial nodes,
143 before starting the daemon.
147 Silent a too verbose error logging for the old hotplug.d/ dev.d/
150 The copy of klibc is removed. A systemwide installed version of klibc
151 should be used to build a klibc udev now.
155 NAME="" will not create any nodes, but execute RUN keys. To completely
156 ignore an event the OPTION "ignore_device" should be used.
158 After removal of the reorder queue, events with a TIMEOUT can be executed
159 without any queuing now.
163 Fixed bug in udevd, if inotify is not available. We depend on netlink
164 uevents now, kernels without that event source will not work with that
165 version of udev anymore.
169 The rule parsing happens now in the daemon once at startup, all udev
170 event processes inherit the already parsed rules from the daemon.
171 It is shipped with SUSE10.0 and reduces heavily the system load at
172 startup. The option to save precompiled rules and let the udev process
173 pick the them up is removed, as it's no longer needed.
175 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
176 device. Libsysfs is changed to "translate" the requested link into the
177 real device path, as it would happen with the hotplug event. Otherwise
178 device removal and the udev database will not work.
180 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
183 A few improvements for vol_id, the filesytem probing code.
187 Fix a stupid typo in extras/run_directory for "make install".
189 scsi_id creates the temporary devnode now in /dev for usage with a
190 non-writable /tmp directory.
192 The uevent kernel socket buffer can carry app. 50.000 events now,
193 let's see who can break this again. :)
195 The upcoming kernel will have a new input driver core integration.
196 Some class devices are now symlinks to the real device. libsysfs
197 needs a fix for this to work correctly. Udevstart of older udev
198 versions will _not_ create these devices!
202 Fix a 'install' target in the Makefile, that prevents EXTRAS from
207 A bunch of mostly trivial bugfixes. From now on no node name or
208 symlink name can contain any character than plain whitelisted ascii
209 characters or validated utf8 byte-streams. This is needed for the
210 /dev/disk/by-label/* links, cause we import untrusted data and
211 export it to the filesystem.
215 More bugfixes. If udevd was started from the kernel, we don't
216 have stdin/stdout/stderr, which broke the forked tools in some
221 Bugfix. udevstart event ordering was broken for a long time.
222 The new run_program() uncovered it, cause /dev/null was not
223 available while we try to run external programs.
224 Now udevstart should create it before we run anything.
228 Minor bugfixes and some distro rules updates. If you don't have the
229 persistent disk rules in /dev/disk/by-*/* on your distro, just
230 grab it from here. :)
234 We can use socket communication now to pass events from udev to
236 RUN+="socket:/org/freedesktop/hal/udev_event"
237 will pass the whole udev event to the HAL daemon without the need
238 for a forked helper. (See ChangeLog for udevmonitor, as an example)
242 Mostly bugfixes and see ChangeLog.
244 The test for the existence of an environment value should be
246 ENV{KEY}=="*" to ENV{KEY}=="?*"
247 cause "*" will not fail anymore, if the key does not exist or
252 Bugfixes and a few tweaks described in the ChangeLog.
256 Mostly a Bugfix release.
258 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
259 timing with custom rules.
263 We changed the internal rule storage format. Our large rule files took
264 2 MB of RAM, with the change we are down to 99kB.
266 If the device-node has been created with default name and no symlink or
267 options are to remenber, it is not longer stored in the udevdb. HAL will
268 need to be updated to work correctly with that change.
270 To overrride optimization flags, OPTFLAGS may be used now.
278 Major changes happened with this release. The goal is to take over the
279 complete kernel-event handling and provide a more efficient way to dispatch
280 kernel events. Replacing most of the current shell script logic and the
281 kernel forked helper with a netlink-daemon and a rule-based event handling.
283 o udevd listens to netlink events now. The first valid netlink event
284 will make udevd ignore any message from udevsend that contains a
285 SEQNUM, to avoid duplicate events. The forked events can be disabled
287 echo "" > /proc/sys/kernel/hotplug
288 For full support, the broken input-subsytem needs to be fixed, not to
289 bypass the driver core.
291 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
292 removed from udev itself and must be emulated by calling small
293 helper binaries provided in the extras folder:
294 make EXTRAS=extras/run_directory/
295 will build udev_run_devd and udev_run_hotplugd, which can be called
296 from a rule if needed:
297 RUN+="/sbin/udev_run_hotplugd"
298 The recommended way to handle this is to convert all the calls from
299 the directories to explicit udev rules and get completely rid of the
300 multiplexing. (To catch a ttyUSB event, you now no longer need to
301 fork and exit 300 tty script instances you are not interested in, it
302 is just one rule that matches exactly the device.)
304 o udev handles now _all_ events not just events for class and block
305 devices, this way it is possible to control the complete event
306 behavior with udev rules. Especially useful for rules like:
307 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
309 o As used in the modalias rule, udev supports now textual
310 substitution placeholder along with the usual format chars. This
311 needs to be documented, for now it's only visible in udev_rules_parse.c.
313 o The rule keys support now more operations. This is documented in the
314 man page. It is possible to add values to list-keys like the SYMLINK
315 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
316 Also "final"-assignments are supported by using KEY:="value", which will
317 prevent changing the key by any later rule.
319 o kernel 2.6.12 has the "detached_state" attribute removed from
320 sysfs, which was used to recognize sysfs population. We switched that
321 to wait for the "bus" link, which is only available in kernels after 2.6.11.
322 Running this udev version on older kernels may cause a short delay for
325 o To provide infrastructure for persistent device naming, the id programs:
326 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
327 to export the probed data in environment key format:
328 pim:~ # /sbin/ata_id --export /dev/hda
329 ID_MODEL=HTS726060M9AT00
330 ID_SERIAL=MRH401M4G6UM9B
334 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
335 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
338 kay@pim:~> tree /dev/disk
341 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
342 | `-- IBM-Memory_Key -> ../../sda
344 | |-- swap -> ../../hda1
345 | |-- date -> ../../sda1
346 | `-- home -> ../../hda3
348 |-- 2E08712B0870F2E7 -> ../../hda3
349 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
350 |-- E845-7A89 -> ../../sda1
351 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
353 The IMPORT= operation will import these keys in the environment and make
354 it available for later PROGRAM= and RUN= executed programs. The keys are
355 also stored in the udevdb and can be queried from there with one of the
358 o A few binaries are silently added to the repository, which can be used
359 to replay kernel events from initramfs instead of using coldplug. udevd
360 can be instructed now to queue-up events while the stored events from
361 initramfs are filled into the udevd-queue. This code is still under
362 development and there is no documentation now besides the code itself.
363 The additional binaries get compiled, but are not installed by default.
365 o There is also a temporary fix for a performance problem where too many
366 events happen in parallel and every event needs to parse the rules.
367 udev can now read precompiled rules stored on disk. This is likely to be
368 replaced by a more elegant solution in a future udev version.
372 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
373 Fix for libsysfs not to expect this file was added.
377 All rules are applied now, but only the first matching rule with a NAME-key
378 will be applied. All later rules with NAME-key are completely ignored. This
379 way system supplied symlinks or permissions gets applied to user-defined
383 Please check your rules setup, if you may need to add OPTIONS="last_rule"
384 to some rules, to keep the old behavior.
386 The rules are read on "remove"-events too. That makes is possible to match
387 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
388 instruct udev to ignore an event (OPTIONS="ignore_device").
389 The new ACTION-key may be used to let a rule act only at a "remove"-event.
391 The new RUN-key supports rule-based execution of programs after device-node
392 handling. This is meant as a general replacement for the dev.d/-directories
393 to give fine grained control over the execution of programs.
395 The %s{}-sysfs format char replacement values are searched at any of the
396 devices in the device chain now, not only at the class-device.
398 We support log priority levels now. The value udev_log in udev.conf is used
399 to determine what is printed to syslog. This makes it possible to
400 run a version with compiled-in debug messages in a production environment
401 which is sometimes needed to find a bug.
402 It is still possible to supress the inclusion of _any_ syslog usage with
403 USE_LOG=false to create the smallest possible binaries if needed.
404 The configured udev_log value can be overridden with the environment variable
409 Possible use of a system-wide klibc:
410 make USE_KLIBC=true KLCC=/usr/bin/klcc all
411 will link against an external klibc and our own version will be ignored.
415 We support an unlimited count of symlinks now.
417 If USE_STATIC=true is passed to a glibc build, we link statically and use
418 a built-in userdb parser to resolve user and group names.
420 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
421 we walk up the chain of physical devices to find a match.
423 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
424 easy to skip certain attribute matches without composing rules with weird
425 character class negations like:
426 KERNEL="[!s][!c][!d]*"
427 this can now be replaced with:
429 The current simple '=' is still supported, and should work as it does today,
430 but existing rules should be converted if possible, to be better readable.
432 We have new ENV{}== key now, to match against a maximum of 5 environment
435 udevstart is its own binary again, cause we don't need co carry this araound
436 with every forked event.