3 A bunch of mostly trivial bugfixes. From now on no node name or
4 symlink name can contain any character than plain whitelisted ascii
5 characters or validated utf8 byte-streams. This is needed for the
6 /dev/disk/by-label/* links, cause we import untrusted data and
7 export it to the filesystem.
11 More bugfixes. If udevd was started from the kernel, we don't
12 have stdin/stdout/stderr, which broke the forked tools in some
17 Bugfix. udevstart event ordering was broken for a long time.
18 The new run_program() uncovered it, cause /dev/null was not
19 available while we try to run external programs.
20 Now udevstart should create it before we run anything.
24 Minor bugfixes and some distro rules updates. If you don't have the
25 persistent disk rules in /dev/disk/by-*/* on your distro, just
30 We can use socket communication now to pass events from udev to
32 RUN+="socket:/org/freedesktop/hal/udev_event"
33 will pass the whole udev event to the HAL daemon without the need
34 for a forked helper. (See ChangeLog for udevmonitor, as an example)
38 Mostly bugfixes and see ChangeLog.
40 The test for the existence of an environment value should be
42 ENV{KEY}=="*" to ENV{KEY}=="?*"
43 cause "*" will not fail anymore, if the key does not exist or
48 Bugfixes and a few tweaks described in the ChangeLog.
52 Mostly a Bugfix release.
54 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
55 timing with custom rules.
59 We changed the internal rule storage format. Our large rule files took
60 2 MB of RAM, with the change we are down to 99kB.
62 If the device-node has been created with default name and no symlink or
63 options are to remenber, it is not longer stored in the udevdb. HAL will
64 need to be updated to work correctly with that change.
66 To overrride optimization flags, OPTFLAGS may be used now.
74 Major changes happened with this release. The goal is to take over the
75 complete kernel-event handling and provide a more efficient way to dispatch
76 kernel events. Replacing most of the current shell script logic and the
77 kernel forked helper with a netlink-daemon and a rule-based event handling.
79 o udevd listens to netlink events now. The first valid netlink event
80 will make udevd ignore any message from udevsend that contains a
81 SEQNUM, to avoid duplicate events. The forked events can be disabled
83 echo "" > /proc/sys/kernel/hotplug
84 For full support, the broken input-subsytem needs to be fixed, not to
85 bypass the driver core.
87 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
88 removed from udev itself and must be emulated by calling small
89 helper binaries provided in the extras folder:
90 make EXTRAS=extras/run_directory/
91 will build udev_run_devd and udev_run_hotplugd, which can be called
92 from a rule if needed:
93 RUN+="/sbin/udev_run_hotplugd"
94 The recommended way to handle this is to convert all the calls from
95 the directories to explicit udev rules and get completely rid of the
96 multiplexing. (To catch a ttyUSB event, you now no longer need to
97 fork and exit 300 tty script instances you are not interested in, it
98 is just one rule that matches exactly the device.)
100 o udev handles now _all_ events not just events for class and block
101 devices, this way it is possible to control the complete event
102 behavior with udev rules. Especially useful for rules like:
103 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
105 o As used in the modalias rule, udev supports now textual
106 substitution placeholder along with the usual format chars. This
107 needs to be documented, for now it's only visible in udev_rules_parse.c.
109 o The rule keys support now more operations. This is documented in the
110 man page. It is possible to add values to list-keys like the SYMLINK
111 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
112 Also "final"-assignments are supported by using KEY:="value", which will
113 prevent changing the key by any later rule.
115 o kernel 2.6.12 has the "detached_state" attribute removed from
116 sysfs, which was used to recognize sysfs population. We switched that
117 to wait for the "bus" link, which is only available in kernels after 2.6.11.
118 Running this udev version on older kernels may cause a short delay for
121 o To provide infrastructure for persistent device naming, the id programs:
122 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
123 to export the probed data in environment key format:
124 pim:~ # /sbin/ata_id --export /dev/hda
125 ID_MODEL=HTS726060M9AT00
126 ID_SERIAL=MRH401M4G6UM9B
130 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
131 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
134 kay@pim:~> tree /dev/disk
137 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
138 | `-- IBM-Memory_Key -> ../../sda
140 | |-- swap -> ../../hda1
141 | |-- date -> ../../sda1
142 | `-- home -> ../../hda3
144 |-- 2E08712B0870F2E7 -> ../../hda3
145 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
146 |-- E845-7A89 -> ../../sda1
147 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
149 The IMPORT= operation will import these keys in the environment and make
150 it available for later PROGRAM= and RUN= executed programs. The keys are
151 also stored in the udevdb and can be queried from there with one of the
154 o A few binaries are silently added to the repository, which can be used
155 to replay kernel events from initramfs instead of using coldplug. udevd
156 can be instructed now to queue-up events while the stored events from
157 initramfs are filled into the udevd-queue. This code is still under
158 development and there is no documentation now besides the code itself.
159 The additional binaries get compiled, but are not installed by default.
161 o There is also a temporary fix for a performance problem where too many
162 events happen in parallel and every event needs to parse the rules.
163 udev can now read precompiled rules stored on disk. This is likely to be
164 replaced by a more elegant solution in a future udev version.
168 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
169 Fix for libsysfs not to expect this file was added.
173 All rules are applied now, but only the first matching rule with a NAME-key
174 will be applied. All later rules with NAME-key are completely ignored. This
175 way system supplied symlinks or permissions gets applied to user-defined
179 Please check your rules setup, if you may need to add OPTIONS="last_rule"
180 to some rules, to keep the old behavior.
182 The rules are read on "remove"-events too. That makes is possible to match
183 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
184 instruct udev to ignore an event (OPTIONS="ignore_device").
185 The new ACTION-key may be used to let a rule act only at a "remove"-event.
187 The new RUN-key supports rule-based execution of programs after device-node
188 handling. This is meant as a general replacement for the dev.d/-directories
189 to give fine grained control over the execution of programs.
191 The %s{}-sysfs format char replacement values are searched at any of the
192 devices in the device chain now, not only at the class-device.
194 We support log priority levels now. The value udev_log in udev.conf is used
195 to determine what is printed to syslog. This makes it possible to
196 run a version with compiled-in debug messages in a production environment
197 which is sometimes needed to find a bug.
198 It is still possible to supress the inclusion of _any_ syslog usage with
199 USE_LOG=false to create the smallest possible binaries if needed.
200 The configured udev_log value can be overridden with the environment variable
205 Possible use of a system-wide klibc:
206 make USE_KLIBC=true KLCC=/usr/bin/klcc all
207 will link against an external klibc and our own version will be ignored.
211 We support an unlimited count of symlinks now.
213 If USE_STATIC=true is passed to a glibc build, we link statically and use
214 a built-in userdb parser to resolve user and group names.
216 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
217 we walk up the chain of physical devices to find a match.
219 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
220 easy to skip certain attribute matches without composing rules with weird
221 character class negations like:
222 KERNEL="[!s][!c][!d]*"
223 this can now be replaced with:
225 The current simple '=' is still supported, and should work as it does today,
226 but existing rules should be converted if possible, to be better readable.
228 We have new ENV{}== key now, to match against a maximum of 5 environment
231 udevstart is its own binary again, cause we don't need co carry this araound
232 with every forked event.