3 Let scsi_id request libata drive serial numbers from page 0x80.
5 Renamed etc/udev/persistent.rules to persistent-disk.rules and
6 added /dev/disk/by-name/* for device mapper device names.
8 Removed %e from the man page. It never worked reliably outside
9 of udevstart and udevstart is no longer recommended to use.
13 Symlinks are now exported to the event environment. Hopefully it's no
14 longer needed to run udevinfo from an event process, like it was
15 mentioned on the hotplug list:
16 UDEV [1134776873.702967] add@/block/sdb
19 DEVLINKS=/dev/disk/by-id/usb-IBM_Memory_Key_0218B301030027E8 /dev/disk/by-path/usb-0218B301030027E8:0:0:0
23 Fix a problem if udevsend is used as the hotplug handler and tries to use
24 syslog, which causes a "vc" event loop. 2.6.15 will make udevsend obsolete
25 and this kind of problems will hopefully go away soon.
29 All built-in logic to work around bad sysfs timing is removed with this
30 version. The need to wait for sysfs files is almost fixed with a kernel
31 version that doesn't work with this udev version anyway. Until we fix
32 the timing of the "bus" link creation, the former integrated logic should
33 be emulated by a rule placed before all other rules:
34 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
36 The option "udev_db" does no longer exist. All udev state will be in
37 /$udev_root/.udev/ now, there is no longer an option to set this
39 If the init script or something else used this value, just depend on
40 this hardcoded path. But remember _all_content_ of this directory is
41 still private to udev and can change at any time.
43 Default location for rule sripts and helper programs is now: /lib/udev/.
44 Everything that is not useful on the commandline should go into this
45 directory. Some of the helpers in the extras folder are installed there
46 now. The rules need to be changed, to find the helpers there.
48 Also /lib/udev/devices is recommended as a directory where packages or
49 the user can place real device nodes, which get copied over to /dev at
50 every boot. This should replace the various solutions with custom config
53 Udevsend does no longer start the udev daemon. This must be done with
54 the init script that prepares /dev on tmpfs and creates the initial nodes,
55 before starting the daemon.
59 Silent a too verbose error logging for the old hotplug.d/ dev.d/
62 The copy of klibc is removed. A systemwide installed version of klibc
63 should be used to build a klibc udev now.
67 NAME="" will not create any nodes, but execute RUN keys. To completely
68 ignore an event the OPTION "ignore_device" should be used.
70 After removal of the reorder queue, events with a TIMEOUT can be executed
71 without any queuing now.
75 Fixed bug in udevd, if inotify is not available. We depend on netlink
76 uevents now, kernels without that event source will not work with that
77 version of udev anymore.
81 The rule parsing happens now in the daemon once at startup, all udev
82 event processes inherit the already parsed rules from the daemon.
83 It is shipped with SUSE10.0 and reduces heavily the system load at
84 startup. The option to save precompiled rules and let the udev process
85 pick the them up is removed, as it's no longer needed.
87 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
88 device. Libsysfs is changed to "translate" the requested link into the
89 real device path, as it would happen with the hotplug event. Otherwise
90 device removal and the udev database will not work.
92 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
95 A few improvements for vol_id, the filesytem probing code.
99 Fix a stupid typo in extras/run_directory for "make install".
101 scsi_id creates the temporary devnode now in /dev for usage with a
102 non-writable /tmp directory.
104 The uevent kernel socket buffer can carry app. 50.000 events now,
105 let's see who can break this again. :)
107 The upcoming kernel will have a new input driver core integration.
108 Some class devices are now symlinks to the real device. libsysfs
109 needs a fix for this to work correctly. Udevstart of older udev
110 versions will _not_ create these devices!
114 Fix a 'install' target in the Makefile, that prevents EXTRAS from
119 A bunch of mostly trivial bugfixes. From now on no node name or
120 symlink name can contain any character than plain whitelisted ascii
121 characters or validated utf8 byte-streams. This is needed for the
122 /dev/disk/by-label/* links, cause we import untrusted data and
123 export it to the filesystem.
127 More bugfixes. If udevd was started from the kernel, we don't
128 have stdin/stdout/stderr, which broke the forked tools in some
133 Bugfix. udevstart event ordering was broken for a long time.
134 The new run_program() uncovered it, cause /dev/null was not
135 available while we try to run external programs.
136 Now udevstart should create it before we run anything.
140 Minor bugfixes and some distro rules updates. If you don't have the
141 persistent disk rules in /dev/disk/by-*/* on your distro, just
142 grab it from here. :)
146 We can use socket communication now to pass events from udev to
148 RUN+="socket:/org/freedesktop/hal/udev_event"
149 will pass the whole udev event to the HAL daemon without the need
150 for a forked helper. (See ChangeLog for udevmonitor, as an example)
154 Mostly bugfixes and see ChangeLog.
156 The test for the existence of an environment value should be
158 ENV{KEY}=="*" to ENV{KEY}=="?*"
159 cause "*" will not fail anymore, if the key does not exist or
164 Bugfixes and a few tweaks described in the ChangeLog.
168 Mostly a Bugfix release.
170 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
171 timing with custom rules.
175 We changed the internal rule storage format. Our large rule files took
176 2 MB of RAM, with the change we are down to 99kB.
178 If the device-node has been created with default name and no symlink or
179 options are to remenber, it is not longer stored in the udevdb. HAL will
180 need to be updated to work correctly with that change.
182 To overrride optimization flags, OPTFLAGS may be used now.
190 Major changes happened with this release. The goal is to take over the
191 complete kernel-event handling and provide a more efficient way to dispatch
192 kernel events. Replacing most of the current shell script logic and the
193 kernel forked helper with a netlink-daemon and a rule-based event handling.
195 o udevd listens to netlink events now. The first valid netlink event
196 will make udevd ignore any message from udevsend that contains a
197 SEQNUM, to avoid duplicate events. The forked events can be disabled
199 echo "" > /proc/sys/kernel/hotplug
200 For full support, the broken input-subsytem needs to be fixed, not to
201 bypass the driver core.
203 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
204 removed from udev itself and must be emulated by calling small
205 helper binaries provided in the extras folder:
206 make EXTRAS=extras/run_directory/
207 will build udev_run_devd and udev_run_hotplugd, which can be called
208 from a rule if needed:
209 RUN+="/sbin/udev_run_hotplugd"
210 The recommended way to handle this is to convert all the calls from
211 the directories to explicit udev rules and get completely rid of the
212 multiplexing. (To catch a ttyUSB event, you now no longer need to
213 fork and exit 300 tty script instances you are not interested in, it
214 is just one rule that matches exactly the device.)
216 o udev handles now _all_ events not just events for class and block
217 devices, this way it is possible to control the complete event
218 behavior with udev rules. Especially useful for rules like:
219 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
221 o As used in the modalias rule, udev supports now textual
222 substitution placeholder along with the usual format chars. This
223 needs to be documented, for now it's only visible in udev_rules_parse.c.
225 o The rule keys support now more operations. This is documented in the
226 man page. It is possible to add values to list-keys like the SYMLINK
227 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
228 Also "final"-assignments are supported by using KEY:="value", which will
229 prevent changing the key by any later rule.
231 o kernel 2.6.12 has the "detached_state" attribute removed from
232 sysfs, which was used to recognize sysfs population. We switched that
233 to wait for the "bus" link, which is only available in kernels after 2.6.11.
234 Running this udev version on older kernels may cause a short delay for
237 o To provide infrastructure for persistent device naming, the id programs:
238 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
239 to export the probed data in environment key format:
240 pim:~ # /sbin/ata_id --export /dev/hda
241 ID_MODEL=HTS726060M9AT00
242 ID_SERIAL=MRH401M4G6UM9B
246 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
247 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
250 kay@pim:~> tree /dev/disk
253 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
254 | `-- IBM-Memory_Key -> ../../sda
256 | |-- swap -> ../../hda1
257 | |-- date -> ../../sda1
258 | `-- home -> ../../hda3
260 |-- 2E08712B0870F2E7 -> ../../hda3
261 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
262 |-- E845-7A89 -> ../../sda1
263 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
265 The IMPORT= operation will import these keys in the environment and make
266 it available for later PROGRAM= and RUN= executed programs. The keys are
267 also stored in the udevdb and can be queried from there with one of the
270 o A few binaries are silently added to the repository, which can be used
271 to replay kernel events from initramfs instead of using coldplug. udevd
272 can be instructed now to queue-up events while the stored events from
273 initramfs are filled into the udevd-queue. This code is still under
274 development and there is no documentation now besides the code itself.
275 The additional binaries get compiled, but are not installed by default.
277 o There is also a temporary fix for a performance problem where too many
278 events happen in parallel and every event needs to parse the rules.
279 udev can now read precompiled rules stored on disk. This is likely to be
280 replaced by a more elegant solution in a future udev version.
284 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
285 Fix for libsysfs not to expect this file was added.
289 All rules are applied now, but only the first matching rule with a NAME-key
290 will be applied. All later rules with NAME-key are completely ignored. This
291 way system supplied symlinks or permissions gets applied to user-defined
295 Please check your rules setup, if you may need to add OPTIONS="last_rule"
296 to some rules, to keep the old behavior.
298 The rules are read on "remove"-events too. That makes is possible to match
299 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
300 instruct udev to ignore an event (OPTIONS="ignore_device").
301 The new ACTION-key may be used to let a rule act only at a "remove"-event.
303 The new RUN-key supports rule-based execution of programs after device-node
304 handling. This is meant as a general replacement for the dev.d/-directories
305 to give fine grained control over the execution of programs.
307 The %s{}-sysfs format char replacement values are searched at any of the
308 devices in the device chain now, not only at the class-device.
310 We support log priority levels now. The value udev_log in udev.conf is used
311 to determine what is printed to syslog. This makes it possible to
312 run a version with compiled-in debug messages in a production environment
313 which is sometimes needed to find a bug.
314 It is still possible to supress the inclusion of _any_ syslog usage with
315 USE_LOG=false to create the smallest possible binaries if needed.
316 The configured udev_log value can be overridden with the environment variable
321 Possible use of a system-wide klibc:
322 make USE_KLIBC=true KLCC=/usr/bin/klcc all
323 will link against an external klibc and our own version will be ignored.
327 We support an unlimited count of symlinks now.
329 If USE_STATIC=true is passed to a glibc build, we link statically and use
330 a built-in userdb parser to resolve user and group names.
332 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
333 we walk up the chain of physical devices to find a match.
335 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
336 easy to skip certain attribute matches without composing rules with weird
337 character class negations like:
338 KERNEL="[!s][!c][!d]*"
339 this can now be replaced with:
341 The current simple '=' is still supported, and should work as it does today,
342 but existing rules should be converted if possible, to be better readable.
344 We have new ENV{}== key now, to match against a maximum of 5 environment
347 udevstart is its own binary again, cause we don't need co carry this araound
348 with every forked event.