3 All built-in logic to work around bad sysfs timing is removed with this
4 version. The need to wait for sysfs files is almost fixed with a kernel
5 version that doesn't work with this udev version anyway. Until we fix
6 the timing of the "bus" link creation, the former integrated logic should
7 be emulated by a rule placed before all other rules:
8 ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*", WAIT_FOR_SYSFS="bus"
10 The option "udev_db" does no longer exist. All udev state will always
11 be in /$udev_root/.udev/ now, there is no longer an option to set this
14 Default location for rule sripts and helper programs is now: /lib/udev/.
15 Everything that is not useful on the commandline should go into this
16 directory. Also /lib/udev/devices/ is recommended as a directory where
17 packages or the user can place real device nodes, which get copied over
18 to /dev at every boot. This should replace the various solutions with
23 Silent a too verbose error logging for the old hotplug.d/ dev.d/
26 The copy of klibc is removed. A systemwide installed version of klibc
27 should be used to build a klibc udev now.
31 NAME="" will not create any nodes, but execute RUN keys. To completely
32 ignore an event the OPTION "ignore_device" should be used.
34 After removal of the reorder queue, events with a TIMEOUT can be executed
35 without any queuing now.
39 Fixed bug in udevd, if inotify is not available. We depend on netlink
40 uevents now, kernels without that event source will not work with that
41 version of udev anymore.
45 The rule parsing happens now in the daemon once at startup, all udev
46 event processes inherit the already parsed rules from the daemon.
47 It is shipped with SUSE10.0 and reduces heavily the system load at
48 startup. The option to save precompiled rules and let the udev process
49 pick the them up is removed, as it's no longer needed.
51 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
52 device. Libsysfs is changed to "translate" the requested link into the
53 real device path, as it would happen with the hotplug event. Otherwise
54 device removal and the udev database will not work.
56 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
59 A few improvements for vol_id, the filesytem probing code.
63 Fix a stupid typo in extras/run_directory for "make install".
65 scsi_id creates the temporary devnode now in /dev for usage with a
66 non-writable /tmp directory.
68 The uevent kernel socket buffer can carry app. 50.000 events now,
69 let's see who can break this again. :)
71 The upcoming kernel will have a new input driver core integration.
72 Some class devices are now symlinks to the real device. libsysfs
73 needs a fix for this to work correctly. Udevstart of older udev
74 versions will _not_ create these devices!
78 Fix a 'install' target in the Makefile, that prevents EXTRAS from
83 A bunch of mostly trivial bugfixes. From now on no node name or
84 symlink name can contain any character than plain whitelisted ascii
85 characters or validated utf8 byte-streams. This is needed for the
86 /dev/disk/by-label/* links, cause we import untrusted data and
87 export it to the filesystem.
91 More bugfixes. If udevd was started from the kernel, we don't
92 have stdin/stdout/stderr, which broke the forked tools in some
97 Bugfix. udevstart event ordering was broken for a long time.
98 The new run_program() uncovered it, cause /dev/null was not
99 available while we try to run external programs.
100 Now udevstart should create it before we run anything.
104 Minor bugfixes and some distro rules updates. If you don't have the
105 persistent disk rules in /dev/disk/by-*/* on your distro, just
106 grab it from here. :)
110 We can use socket communication now to pass events from udev to
112 RUN+="socket:/org/freedesktop/hal/udev_event"
113 will pass the whole udev event to the HAL daemon without the need
114 for a forked helper. (See ChangeLog for udevmonitor, as an example)
118 Mostly bugfixes and see ChangeLog.
120 The test for the existence of an environment value should be
122 ENV{KEY}=="*" to ENV{KEY}=="?*"
123 cause "*" will not fail anymore, if the key does not exist or
128 Bugfixes and a few tweaks described in the ChangeLog.
132 Mostly a Bugfix release.
134 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
135 timing with custom rules.
139 We changed the internal rule storage format. Our large rule files took
140 2 MB of RAM, with the change we are down to 99kB.
142 If the device-node has been created with default name and no symlink or
143 options are to remenber, it is not longer stored in the udevdb. HAL will
144 need to be updated to work correctly with that change.
146 To overrride optimization flags, OPTFLAGS may be used now.
154 Major changes happened with this release. The goal is to take over the
155 complete kernel-event handling and provide a more efficient way to dispatch
156 kernel events. Replacing most of the current shell script logic and the
157 kernel forked helper with a netlink-daemon and a rule-based event handling.
159 o udevd listens to netlink events now. The first valid netlink event
160 will make udevd ignore any message from udevsend that contains a
161 SEQNUM, to avoid duplicate events. The forked events can be disabled
163 echo "" > /proc/sys/kernel/hotplug
164 For full support, the broken input-subsytem needs to be fixed, not to
165 bypass the driver core.
167 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
168 removed from udev itself and must be emulated by calling small
169 helper binaries provided in the extras folder:
170 make EXTRAS=extras/run_directory/
171 will build udev_run_devd and udev_run_hotplugd, which can be called
172 from a rule if needed:
173 RUN+="/sbin/udev_run_hotplugd"
174 The recommended way to handle this is to convert all the calls from
175 the directories to explicit udev rules and get completely rid of the
176 multiplexing. (To catch a ttyUSB event, you now no longer need to
177 fork and exit 300 tty script instances you are not interested in, it
178 is just one rule that matches exactly the device.)
180 o udev handles now _all_ events not just events for class and block
181 devices, this way it is possible to control the complete event
182 behavior with udev rules. Especially useful for rules like:
183 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
185 o As used in the modalias rule, udev supports now textual
186 substitution placeholder along with the usual format chars. This
187 needs to be documented, for now it's only visible in udev_rules_parse.c.
189 o The rule keys support now more operations. This is documented in the
190 man page. It is possible to add values to list-keys like the SYMLINK
191 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
192 Also "final"-assignments are supported by using KEY:="value", which will
193 prevent changing the key by any later rule.
195 o kernel 2.6.12 has the "detached_state" attribute removed from
196 sysfs, which was used to recognize sysfs population. We switched that
197 to wait for the "bus" link, which is only available in kernels after 2.6.11.
198 Running this udev version on older kernels may cause a short delay for
201 o To provide infrastructure for persistent device naming, the id programs:
202 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
203 to export the probed data in environment key format:
204 pim:~ # /sbin/ata_id --export /dev/hda
205 ID_MODEL=HTS726060M9AT00
206 ID_SERIAL=MRH401M4G6UM9B
210 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
211 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
214 kay@pim:~> tree /dev/disk
217 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
218 | `-- IBM-Memory_Key -> ../../sda
220 | |-- swap -> ../../hda1
221 | |-- date -> ../../sda1
222 | `-- home -> ../../hda3
224 |-- 2E08712B0870F2E7 -> ../../hda3
225 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
226 |-- E845-7A89 -> ../../sda1
227 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
229 The IMPORT= operation will import these keys in the environment and make
230 it available for later PROGRAM= and RUN= executed programs. The keys are
231 also stored in the udevdb and can be queried from there with one of the
234 o A few binaries are silently added to the repository, which can be used
235 to replay kernel events from initramfs instead of using coldplug. udevd
236 can be instructed now to queue-up events while the stored events from
237 initramfs are filled into the udevd-queue. This code is still under
238 development and there is no documentation now besides the code itself.
239 The additional binaries get compiled, but are not installed by default.
241 o There is also a temporary fix for a performance problem where too many
242 events happen in parallel and every event needs to parse the rules.
243 udev can now read precompiled rules stored on disk. This is likely to be
244 replaced by a more elegant solution in a future udev version.
248 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
249 Fix for libsysfs not to expect this file was added.
253 All rules are applied now, but only the first matching rule with a NAME-key
254 will be applied. All later rules with NAME-key are completely ignored. This
255 way system supplied symlinks or permissions gets applied to user-defined
259 Please check your rules setup, if you may need to add OPTIONS="last_rule"
260 to some rules, to keep the old behavior.
262 The rules are read on "remove"-events too. That makes is possible to match
263 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
264 instruct udev to ignore an event (OPTIONS="ignore_device").
265 The new ACTION-key may be used to let a rule act only at a "remove"-event.
267 The new RUN-key supports rule-based execution of programs after device-node
268 handling. This is meant as a general replacement for the dev.d/-directories
269 to give fine grained control over the execution of programs.
271 The %s{}-sysfs format char replacement values are searched at any of the
272 devices in the device chain now, not only at the class-device.
274 We support log priority levels now. The value udev_log in udev.conf is used
275 to determine what is printed to syslog. This makes it possible to
276 run a version with compiled-in debug messages in a production environment
277 which is sometimes needed to find a bug.
278 It is still possible to supress the inclusion of _any_ syslog usage with
279 USE_LOG=false to create the smallest possible binaries if needed.
280 The configured udev_log value can be overridden with the environment variable
285 Possible use of a system-wide klibc:
286 make USE_KLIBC=true KLCC=/usr/bin/klcc all
287 will link against an external klibc and our own version will be ignored.
291 We support an unlimited count of symlinks now.
293 If USE_STATIC=true is passed to a glibc build, we link statically and use
294 a built-in userdb parser to resolve user and group names.
296 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
297 we walk up the chain of physical devices to find a match.
299 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
300 easy to skip certain attribute matches without composing rules with weird
301 character class negations like:
302 KERNEL="[!s][!c][!d]*"
303 this can now be replaced with:
305 The current simple '=' is still supported, and should work as it does today,
306 but existing rules should be converted if possible, to be better readable.
308 We have new ENV{}== key now, to match against a maximum of 5 environment
311 udevstart is its own binary again, cause we don't need co carry this araound
312 with every forked event.