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
16 Silent a too verbose error logging for the old hotplug.d/ dev.d/
19 The copy of klibc is removed. A systemwide installed version of klibc
20 should be used to build a klibc udev now.
24 NAME="" will not create any nodes, but execute RUN keys. To completely
25 ignore an event the OPTION "ignore_device" should be used.
27 After removal of the reorder queue, events with a TIMEOUT can be executed
28 without any queuing now.
32 Fixed bug in udevd, if inotify is not available. We depend on netlink
33 uevents now, kernels without that event source will not work with that
34 version of udev anymore.
38 The rule parsing happens now in the daemon once at startup, all udev
39 event processes inherit the already parsed rules from the daemon.
40 It is shipped with SUSE10.0 and reduces heavily the system load at
41 startup. The option to save precompiled rules and let the udev process
42 pick the them up is removed, as it's no longer needed.
44 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
45 device. Libsysfs is changed to "translate" the requested link into the
46 real device path, as it would happen with the hotplug event. Otherwise
47 device removal and the udev database will not work.
49 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
52 A few improvements for vol_id, the filesytem probing code.
56 Fix a stupid typo in extras/run_directory for "make install".
58 scsi_id creates the temporary devnode now in /dev for usage with a
59 non-writable /tmp directory.
61 The uevent kernel socket buffer can carry app. 50.000 events now,
62 let's see who can break this again. :)
64 The upcoming kernel will have a new input driver core integration.
65 Some class devices are now symlinks to the real device. libsysfs
66 needs a fix for this to work correctly. Udevstart of older udev
67 versions will _not_ create these devices!
71 Fix a 'install' target in the Makefile, that prevents EXTRAS from
76 A bunch of mostly trivial bugfixes. From now on no node name or
77 symlink name can contain any character than plain whitelisted ascii
78 characters or validated utf8 byte-streams. This is needed for the
79 /dev/disk/by-label/* links, cause we import untrusted data and
80 export it to the filesystem.
84 More bugfixes. If udevd was started from the kernel, we don't
85 have stdin/stdout/stderr, which broke the forked tools in some
90 Bugfix. udevstart event ordering was broken for a long time.
91 The new run_program() uncovered it, cause /dev/null was not
92 available while we try to run external programs.
93 Now udevstart should create it before we run anything.
97 Minor bugfixes and some distro rules updates. If you don't have the
98 persistent disk rules in /dev/disk/by-*/* on your distro, just
103 We can use socket communication now to pass events from udev to
105 RUN+="socket:/org/freedesktop/hal/udev_event"
106 will pass the whole udev event to the HAL daemon without the need
107 for a forked helper. (See ChangeLog for udevmonitor, as an example)
111 Mostly bugfixes and see ChangeLog.
113 The test for the existence of an environment value should be
115 ENV{KEY}=="*" to ENV{KEY}=="?*"
116 cause "*" will not fail anymore, if the key does not exist or
121 Bugfixes and a few tweaks described in the ChangeLog.
125 Mostly a Bugfix release.
127 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
128 timing with custom rules.
132 We changed the internal rule storage format. Our large rule files took
133 2 MB of RAM, with the change we are down to 99kB.
135 If the device-node has been created with default name and no symlink or
136 options are to remenber, it is not longer stored in the udevdb. HAL will
137 need to be updated to work correctly with that change.
139 To overrride optimization flags, OPTFLAGS may be used now.
147 Major changes happened with this release. The goal is to take over the
148 complete kernel-event handling and provide a more efficient way to dispatch
149 kernel events. Replacing most of the current shell script logic and the
150 kernel forked helper with a netlink-daemon and a rule-based event handling.
152 o udevd listens to netlink events now. The first valid netlink event
153 will make udevd ignore any message from udevsend that contains a
154 SEQNUM, to avoid duplicate events. The forked events can be disabled
156 echo "" > /proc/sys/kernel/hotplug
157 For full support, the broken input-subsytem needs to be fixed, not to
158 bypass the driver core.
160 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
161 removed from udev itself and must be emulated by calling small
162 helper binaries provided in the extras folder:
163 make EXTRAS=extras/run_directory/
164 will build udev_run_devd and udev_run_hotplugd, which can be called
165 from a rule if needed:
166 RUN+="/sbin/udev_run_hotplugd"
167 The recommended way to handle this is to convert all the calls from
168 the directories to explicit udev rules and get completely rid of the
169 multiplexing. (To catch a ttyUSB event, you now no longer need to
170 fork and exit 300 tty script instances you are not interested in, it
171 is just one rule that matches exactly the device.)
173 o udev handles now _all_ events not just events for class and block
174 devices, this way it is possible to control the complete event
175 behavior with udev rules. Especially useful for rules like:
176 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
178 o As used in the modalias rule, udev supports now textual
179 substitution placeholder along with the usual format chars. This
180 needs to be documented, for now it's only visible in udev_rules_parse.c.
182 o The rule keys support now more operations. This is documented in the
183 man page. It is possible to add values to list-keys like the SYMLINK
184 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
185 Also "final"-assignments are supported by using KEY:="value", which will
186 prevent changing the key by any later rule.
188 o kernel 2.6.12 has the "detached_state" attribute removed from
189 sysfs, which was used to recognize sysfs population. We switched that
190 to wait for the "bus" link, which is only available in kernels after 2.6.11.
191 Running this udev version on older kernels may cause a short delay for
194 o To provide infrastructure for persistent device naming, the id programs:
195 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
196 to export the probed data in environment key format:
197 pim:~ # /sbin/ata_id --export /dev/hda
198 ID_MODEL=HTS726060M9AT00
199 ID_SERIAL=MRH401M4G6UM9B
203 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
204 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
207 kay@pim:~> tree /dev/disk
210 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
211 | `-- IBM-Memory_Key -> ../../sda
213 | |-- swap -> ../../hda1
214 | |-- date -> ../../sda1
215 | `-- home -> ../../hda3
217 |-- 2E08712B0870F2E7 -> ../../hda3
218 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
219 |-- E845-7A89 -> ../../sda1
220 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
222 The IMPORT= operation will import these keys in the environment and make
223 it available for later PROGRAM= and RUN= executed programs. The keys are
224 also stored in the udevdb and can be queried from there with one of the
227 o A few binaries are silently added to the repository, which can be used
228 to replay kernel events from initramfs instead of using coldplug. udevd
229 can be instructed now to queue-up events while the stored events from
230 initramfs are filled into the udevd-queue. This code is still under
231 development and there is no documentation now besides the code itself.
232 The additional binaries get compiled, but are not installed by default.
234 o There is also a temporary fix for a performance problem where too many
235 events happen in parallel and every event needs to parse the rules.
236 udev can now read precompiled rules stored on disk. This is likely to be
237 replaced by a more elegant solution in a future udev version.
241 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
242 Fix for libsysfs not to expect this file was added.
246 All rules are applied now, but only the first matching rule with a NAME-key
247 will be applied. All later rules with NAME-key are completely ignored. This
248 way system supplied symlinks or permissions gets applied to user-defined
252 Please check your rules setup, if you may need to add OPTIONS="last_rule"
253 to some rules, to keep the old behavior.
255 The rules are read on "remove"-events too. That makes is possible to match
256 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
257 instruct udev to ignore an event (OPTIONS="ignore_device").
258 The new ACTION-key may be used to let a rule act only at a "remove"-event.
260 The new RUN-key supports rule-based execution of programs after device-node
261 handling. This is meant as a general replacement for the dev.d/-directories
262 to give fine grained control over the execution of programs.
264 The %s{}-sysfs format char replacement values are searched at any of the
265 devices in the device chain now, not only at the class-device.
267 We support log priority levels now. The value udev_log in udev.conf is used
268 to determine what is printed to syslog. This makes it possible to
269 run a version with compiled-in debug messages in a production environment
270 which is sometimes needed to find a bug.
271 It is still possible to supress the inclusion of _any_ syslog usage with
272 USE_LOG=false to create the smallest possible binaries if needed.
273 The configured udev_log value can be overridden with the environment variable
278 Possible use of a system-wide klibc:
279 make USE_KLIBC=true KLCC=/usr/bin/klcc all
280 will link against an external klibc and our own version will be ignored.
284 We support an unlimited count of symlinks now.
286 If USE_STATIC=true is passed to a glibc build, we link statically and use
287 a built-in userdb parser to resolve user and group names.
289 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
290 we walk up the chain of physical devices to find a match.
292 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
293 easy to skip certain attribute matches without composing rules with weird
294 character class negations like:
295 KERNEL="[!s][!c][!d]*"
296 this can now be replaced with:
298 The current simple '=' is still supported, and should work as it does today,
299 but existing rules should be converted if possible, to be better readable.
301 We have new ENV{}== key now, to match against a maximum of 5 environment
304 udevstart is its own binary again, cause we don't need co carry this araound
305 with every forked event.