+udev 059
+========
+Major changes happened with this release. The goal is to take over the
+complete kernel-event handling and provide a more efficient way to dispatch
+kernel events. Replacing most of the current shell script logic and the
+kernel forked helper with a netlink-daemon and a rule-based event handling.
+
+o udevd listens to netlink events now. The first valid netlink event
+ will make udevd ignore any message from udevsend that contains a
+ SEQNUM, to avoid duplicate events. The forked events can be disabled
+ with:
+ echo "" > /proc/sys/kernel/hotplug
+ For full support, the broken input-subsytem needs to be fixed, not to
+ bypass the driver core.
+
+o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
+ removed from udev itself and must be emulated by calling small
+ helper binaries provided in the extras folder:
+ make EXTRAS=extras/run_directory/
+ will build udev_run_devd and udev_run_hotplugd, which can be called
+ from a rule if needed:
+ RUN+="/sbin/udev_run_hotplugd"
+ The recommended way to handle this is to convert all the calls from
+ the directories to explicit udev rules and get completely rid of the
+ multiplexing. (To catch a ttyUSB event, you now no longer need to
+ fork and exit 300 tty script instances you are not interested in, it
+ is just one rule that matches exactly the device.)
+
+o udev handles now _all_ events not just events for class and block
+ devices, this way it is possible to control the complete event
+ behavior with udev rules. Especially useful for rules like:
+ ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
+
+o As used in the modalias rule, udev supports now textual
+ substitution placeholder along with the usual format chars. This
+ needs to be documented, for now it's only visible in udev_rules_parse.c.
+
+o The rule keys support now more operations. This is documented in the
+ man page. It is possible to add values to list-keys like the SYMLINK
+ and RUN list with KEY+="value" and to clear the list by assigning KEY="".
+ Also "final"-assignments are supported by using KEY:="value", which will
+ prevent changing the key by any later rule.
+
+o kernel 2.6.12 has the "detached_state" attribute removed from
+ sysfs, which was used to recognize sysfs population. We switched that
+ to wait for the "bus" link, which is only available in kernels after 2.6.11.
+ Running this udev version on older kernels may cause a short delay for
+ some events.
+
+o To provide infrastructure for persistent device naming, the id programs:
+ scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
+ to export the probed data in environment key format:
+ pim:~ # /sbin/ata_id --export /dev/hda
+ ID_MODEL=HTS726060M9AT00
+ ID_SERIAL=MRH401M4G6UM9B
+ ID_REVISION=MH4OA6BA
+
+ The following rules:
+ KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
+ KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
+
+ Will create:
+ kay@pim:~> tree /dev/disk
+ /dev/disk
+ |-- by-id
+ | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
+ | `-- IBM-Memory_Key -> ../../sda
+ |-- by-label
+ | |-- swap -> ../../hda1
+ | |-- date -> ../../sda1
+ | `-- home -> ../../hda3
+ `-- by-uuid
+ |-- 2E08712B0870F2E7 -> ../../hda3
+ |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
+ |-- E845-7A89 -> ../../sda1
+ `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
+
+ The IMPORT= operation will import these keys in the environment and make
+ it available for later PROGRAM= and RUN= executed programs. The keys are
+ also stored in the udevdb and can be queried from there with one of the
+ next udev versions.
+
+o A few binaries are silently added to the repository, which can be used
+ to replay kernel events from initramfs instead of using coldplug. udevd
+ can be instructed now to queue-up events while the stored events from
+ initramfs are filled into the udevd-queue. This code is still under
+ development and there is no documentation now besides the code itself.
+ The additional binaries get compiled, but are not installed by default.
+
+o There is also a temporary fix for a performance problem where too many
+ events happen in parallel and every event needs to parse the rules.
+ udev can now read precompiled rules stored on disk. This is likely to be
+ replaced by a more elegant solution in a future udev version.
+
+udev 058
+========
+With kernel version 2.6.12, the sysfs file "detached_state" was removed.
+Fix for libsysfs not to expect this file was added.
+
udev 057
========
All rules are applied now, but only the first matching rule with a NAME-key
if (strncasecmp(key, KEY_IMPORT, sizeof(KEY_IMPORT)-1) == 0) {
attr = get_key_attribute(key + sizeof(KEY_IMPORT)-1);
- if (attr && strstr(attr, "exec")) {
+ if (attr && strstr(attr, "program")) {
dbg(KEY_IMPORT" will be executed");
rule.import_exec = 1;
+ } else if (attr && strstr(attr, "file")) {
+ dbg(KEY_IMPORT" will be included as file");
+ } else {
+ /* figure it out if it is executable */
+ char file[PATH_SIZE];
+ char *pos;
+ struct stat stats;
+
+ strlcpy(file, value, sizeof(file));
+ pos = strchr(file, ' ');
+ if (pos)
+ pos[0] = '\0';
+ dbg(KEY_IMPORT" auto mode for '%s'", file);
+ if (!lstat(file, &stats) && (stats.st_mode & S_IXUSR)) {
+ dbg(KEY_IMPORT" is executable, will be executed");
+ rule.import_exec = 1;
+ }
}
strlcpy(rule.import, value, sizeof(rule.import));
rule.import_operation = operation;
~ianmdlvl / elogind.git / commitdiff