3 Fix cramfs detection on big endian.
5 Make WAIT_FOR_SYSFS usable in "normal" rules and silent if the whole
10 If BUS== and SYSFS{}== have been used in the same rule, the sysfs
11 attributes were only checked at the parent device that matched the
12 by BUS requested subsystem. Fix it to also look at the device we
13 received the event for.
15 Build variable CROSS has changed to CROSS_COMPILE to match the kernel
20 Fix a bug where NAME="" would prevent RUN from beeing executed.
22 RUN="/bin/program" does not longer automatically add the subsystem
23 as the first parameter. This is from the days of /sbin/hotplug
24 which is dead now and it's just confusing to need to add a space at
25 the end of the program name to prevent this.
26 If you use rules that need the subsystem as the first parameter,
27 like the old "udev_run_hotlugd" and "udev_run_devd", add the subsystem
28 to the key like RUN+="/bin/program $env{SUBSYSTEM}".
32 The udev man page has moved to udev(7) as it does not describe a command
33 anymore. The programs udev, udevstart and udevsend are no longer installed
34 by default and must be copied manually, if they should be installed or
35 included in a package.
37 Fix a bug where "ignore_device" could run earlier collected RUN keys before
38 the ignore rule was applied.
40 More preparation for future sysfs changes. usb_id and scsi_id no longer
41 depend on a magic order of devices in the /devices chain. Specific devices
42 should be requested by their subsytem.
44 This will always find the scsi parent device without depending on a specific
46 dev = sysfs_device_get(devpath);
47 dev_usb = sysfs_device_get_parent_with_subsystem(dev, "scsi");
49 The "device" link in the current sysfs layout will be automatically
50 _resolved_ as a parent and in the new sysfs layout it will just _be_ the
51 parent in the devpath. If a device is requested by it's symlink, like all
52 class devices in the new sysfs layout will look like, it gets automatically
53 resolved and substituted with the real devpath and not the symlink path.
56 A similar logic must be applied to _all_ sysfs users, including
57 scripts, that search along parent devices in sysfs. The explicit use of
58 the "device" link must be avoided. With the future sysfs layout all
59 DEVPATH's will start with /devices/ and have a "subsystem" symlink poiting
60 back to the "class" or the "bus". The layout of the parent devices in
61 /devices is not necessarily expected to be stable across kernel releases and
62 searching for parents by their subsystem should make sysfs users tolerant
63 for changed parent chains.
67 Prepare udev to work with the experimental kernel patch, that moves
68 /sys/class devices to /sys/devices and /sys/block to /sys/class/block.
70 Clarify BUS, ID, $id usage and fix $id behavior. This prepares for
71 moving the class devices to /sys/devices.
73 Thanks again to Marco for help finding a hopefully nice compromise
74 to make %b simpler and working again.
78 Complete removal of libsysfs, replaced by simple helper functions
79 which are much simpler and a bit faster. The udev daemon operatesentirely
80 on event parameters and does not use sysfs for simple rules anymore.
81 Please report any new bugs/problems, that may be caused by this big
82 change. They will be fixed immediately.
84 The enumeration format character '%e' is deprecated and will be
85 removed sometimes from a future udev version. It never worked correctly
86 outside of udevstart, so we can't use it with the new parallel
87 coldplug. A simple enumeration is as useless as the devfs naming
88 scheme, just get rid of both if you still use it.
90 MODALIAS and $modalias is not needed and will be removed from one of
91 the next udev versions, replace it in all rules with ENV{MODALIAS} or
92 the sysfs "modalias" value.
94 Thanks a lot to Marco for all his help on finding and fixing bugs.
98 Let scsi_id request libata drive serial numbers from page 0x80.
100 Renamed etc/udev/persistent.rules to persistent-disk.rules and
101 added /dev/disk/by-name/* for device mapper device names.
103 Removed %e from the man page. It never worked reliably outside
104 of udevstart and udevstart is no longer recommended to use.
108 Symlinks are now exported to the event environment. Hopefully it's no
109 longer needed to run udevinfo from an event process, like it was
110 mentioned on the hotplug list:
111 UDEV [1134776873.702967] add@/block/sdb
114 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
118 Fix a problem if udevsend is used as the hotplug handler and tries to use
119 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
120 and this kind of problems will hopefully go away soon.
124 All built-in logic to work around bad sysfs timing is removed with this
125 version. The need to wait for sysfs files is almost fixed with a kernel
126 version that doesn't work with this udev version anyway. Until we fix
127 the timing of the "bus" link creation, the former integrated logic should
128 be emulated by a rule placed before all other rules:
129 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
131 The option "udev_db" does no longer exist. All udev state will be in
132 /$udev_root/.udev/ now, there is no longer an option to set this
134 If the init script or something else used this value, just depend on
135 this hardcoded path. But remember _all_content_ of this directory is
136 still private to udev and can change at any time.
138 Default location for rule sripts and helper programs is now: /lib/udev/.
139 Everything that is not useful on the commandline should go into this
140 directory. Some of the helpers in the extras folder are installed there
141 now. The rules need to be changed, to find the helpers there.
143 Also /lib/udev/devices is recommended as a directory where packages or
144 the user can place real device nodes, which get copied over to /dev at
145 every boot. This should replace the various solutions with custom config
148 Udevsend does no longer start the udev daemon. This must be done with
149 the init script that prepares /dev on tmpfs and creates the initial nodes,
150 before starting the daemon.
154 Silent a too verbose error logging for the old hotplug.d/ dev.d/
157 The copy of klibc is removed. A systemwide installed version of klibc
158 should be used to build a klibc udev now.
162 NAME="" will not create any nodes, but execute RUN keys. To completely
163 ignore an event the OPTION "ignore_device" should be used.
165 After removal of the reorder queue, events with a TIMEOUT can be executed
166 without any queuing now.
170 Fixed bug in udevd, if inotify is not available. We depend on netlink
171 uevents now, kernels without that event source will not work with that
172 version of udev anymore.
176 The rule parsing happens now in the daemon once at startup, all udev
177 event processes inherit the already parsed rules from the daemon.
178 It is shipped with SUSE10.0 and reduces heavily the system load at
179 startup. The option to save precompiled rules and let the udev process
180 pick the them up is removed, as it's no longer needed.
182 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
183 device. Libsysfs is changed to "translate" the requested link into the
184 real device path, as it would happen with the hotplug event. Otherwise
185 device removal and the udev database will not work.
187 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
190 A few improvements for vol_id, the filesytem probing code.
194 Fix a stupid typo in extras/run_directory for "make install".
196 scsi_id creates the temporary devnode now in /dev for usage with a
197 non-writable /tmp directory.
199 The uevent kernel socket buffer can carry app. 50.000 events now,
200 let's see who can break this again. :)
202 The upcoming kernel will have a new input driver core integration.
203 Some class devices are now symlinks to the real device. libsysfs
204 needs a fix for this to work correctly. Udevstart of older udev
205 versions will _not_ create these devices!
209 Fix a 'install' target in the Makefile, that prevents EXTRAS from
214 A bunch of mostly trivial bugfixes. From now on no node name or
215 symlink name can contain any character than plain whitelisted ascii
216 characters or validated utf8 byte-streams. This is needed for the
217 /dev/disk/by-label/* links, cause we import untrusted data and
218 export it to the filesystem.
222 More bugfixes. If udevd was started from the kernel, we don't
223 have stdin/stdout/stderr, which broke the forked tools in some
228 Bugfix. udevstart event ordering was broken for a long time.
229 The new run_program() uncovered it, cause /dev/null was not
230 available while we try to run external programs.
231 Now udevstart should create it before we run anything.
235 Minor bugfixes and some distro rules updates. If you don't have the
236 persistent disk rules in /dev/disk/by-*/* on your distro, just
237 grab it from here. :)
241 We can use socket communication now to pass events from udev to
243 RUN+="socket:/org/freedesktop/hal/udev_event"
244 will pass the whole udev event to the HAL daemon without the need
245 for a forked helper. (See ChangeLog for udevmonitor, as an example)
249 Mostly bugfixes and see ChangeLog.
251 The test for the existence of an environment value should be
253 ENV{KEY}=="*" to ENV{KEY}=="?*"
254 cause "*" will not fail anymore, if the key does not exist or
259 Bugfixes and a few tweaks described in the ChangeLog.
263 Mostly a Bugfix release.
265 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
266 timing with custom rules.
270 We changed the internal rule storage format. Our large rule files took
271 2 MB of RAM, with the change we are down to 99kB.
273 If the device-node has been created with default name and no symlink or
274 options are to remenber, it is not longer stored in the udevdb. HAL will
275 need to be updated to work correctly with that change.
277 To overrride optimization flags, OPTFLAGS may be used now.
285 Major changes happened with this release. The goal is to take over the
286 complete kernel-event handling and provide a more efficient way to dispatch
287 kernel events. Replacing most of the current shell script logic and the
288 kernel forked helper with a netlink-daemon and a rule-based event handling.
290 o udevd listens to netlink events now. The first valid netlink event
291 will make udevd ignore any message from udevsend that contains a
292 SEQNUM, to avoid duplicate events. The forked events can be disabled
294 echo "" > /proc/sys/kernel/hotplug
295 For full support, the broken input-subsytem needs to be fixed, not to
296 bypass the driver core.
298 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
299 removed from udev itself and must be emulated by calling small
300 helper binaries provided in the extras folder:
301 make EXTRAS=extras/run_directory/
302 will build udev_run_devd and udev_run_hotplugd, which can be called
303 from a rule if needed:
304 RUN+="/sbin/udev_run_hotplugd"
305 The recommended way to handle this is to convert all the calls from
306 the directories to explicit udev rules and get completely rid of the
307 multiplexing. (To catch a ttyUSB event, you now no longer need to
308 fork and exit 300 tty script instances you are not interested in, it
309 is just one rule that matches exactly the device.)
311 o udev handles now _all_ events not just events for class and block
312 devices, this way it is possible to control the complete event
313 behavior with udev rules. Especially useful for rules like:
314 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
316 o As used in the modalias rule, udev supports now textual
317 substitution placeholder along with the usual format chars. This
318 needs to be documented, for now it's only visible in udev_rules_parse.c.
320 o The rule keys support now more operations. This is documented in the
321 man page. It is possible to add values to list-keys like the SYMLINK
322 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
323 Also "final"-assignments are supported by using KEY:="value", which will
324 prevent changing the key by any later rule.
326 o kernel 2.6.12 has the "detached_state" attribute removed from
327 sysfs, which was used to recognize sysfs population. We switched that
328 to wait for the "bus" link, which is only available in kernels after 2.6.11.
329 Running this udev version on older kernels may cause a short delay for
332 o To provide infrastructure for persistent device naming, the id programs:
333 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
334 to export the probed data in environment key format:
335 pim:~ # /sbin/ata_id --export /dev/hda
336 ID_MODEL=HTS726060M9AT00
337 ID_SERIAL=MRH401M4G6UM9B
341 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
342 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
345 kay@pim:~> tree /dev/disk
348 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
349 | `-- IBM-Memory_Key -> ../../sda
351 | |-- swap -> ../../hda1
352 | |-- date -> ../../sda1
353 | `-- home -> ../../hda3
355 |-- 2E08712B0870F2E7 -> ../../hda3
356 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
357 |-- E845-7A89 -> ../../sda1
358 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
360 The IMPORT= operation will import these keys in the environment and make
361 it available for later PROGRAM= and RUN= executed programs. The keys are
362 also stored in the udevdb and can be queried from there with one of the
365 o A few binaries are silently added to the repository, which can be used
366 to replay kernel events from initramfs instead of using coldplug. udevd
367 can be instructed now to queue-up events while the stored events from
368 initramfs are filled into the udevd-queue. This code is still under
369 development and there is no documentation now besides the code itself.
370 The additional binaries get compiled, but are not installed by default.
372 o There is also a temporary fix for a performance problem where too many
373 events happen in parallel and every event needs to parse the rules.
374 udev can now read precompiled rules stored on disk. This is likely to be
375 replaced by a more elegant solution in a future udev version.
379 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
380 Fix for libsysfs not to expect this file was added.
384 All rules are applied now, but only the first matching rule with a NAME-key
385 will be applied. All later rules with NAME-key are completely ignored. This
386 way system supplied symlinks or permissions gets applied to user-defined
390 Please check your rules setup, if you may need to add OPTIONS="last_rule"
391 to some rules, to keep the old behavior.
393 The rules are read on "remove"-events too. That makes is possible to match
394 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
395 instruct udev to ignore an event (OPTIONS="ignore_device").
396 The new ACTION-key may be used to let a rule act only at a "remove"-event.
398 The new RUN-key supports rule-based execution of programs after device-node
399 handling. This is meant as a general replacement for the dev.d/-directories
400 to give fine grained control over the execution of programs.
402 The %s{}-sysfs format char replacement values are searched at any of the
403 devices in the device chain now, not only at the class-device.
405 We support log priority levels now. The value udev_log in udev.conf is used
406 to determine what is printed to syslog. This makes it possible to
407 run a version with compiled-in debug messages in a production environment
408 which is sometimes needed to find a bug.
409 It is still possible to supress the inclusion of _any_ syslog usage with
410 USE_LOG=false to create the smallest possible binaries if needed.
411 The configured udev_log value can be overridden with the environment variable
416 Possible use of a system-wide klibc:
417 make USE_KLIBC=true KLCC=/usr/bin/klcc all
418 will link against an external klibc and our own version will be ignored.
422 We support an unlimited count of symlinks now.
424 If USE_STATIC=true is passed to a glibc build, we link statically and use
425 a built-in userdb parser to resolve user and group names.
427 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
428 we walk up the chain of physical devices to find a match.
430 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
431 easy to skip certain attribute matches without composing rules with weird
432 character class negations like:
433 KERNEL="[!s][!c][!d]*"
434 this can now be replaced with:
436 The current simple '=' is still supported, and should work as it does today,
437 but existing rules should be converted if possible, to be better readable.
439 We have new ENV{}== key now, to match against a maximum of 5 environment
442 udevstart is its own binary again, cause we don't need co carry this araound
443 with every forked event.