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prepare RELEASE-NOTES
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
This commit is contained in:
Kay Sievers
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@ -1,3 +1,102 @@
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udev 059
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========
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Major changes happened with this release. The goal is to take over the
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complete kernel-event handling and provide a more efficient way to dispatch
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kernel events. Replacing most of the current shell script logic and the
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kernel forked helper with a netlink-daemon and a rule-based event handling.
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o udevd listens to netlink events now. The first valid netlink event
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will make udevd ignore any message from udevsend that contains a
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SEQNUM, to avoid duplicate events. The forked events can be disabled
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with:
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echo "" > /proc/sys/kernel/hotplug
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For full support, the broken input-subsytem needs to be fixed, not to
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bypass the driver core.
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o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
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removed from udev itself and must be emulated by calling small
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helper binaries provided in the extras folder:
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make EXTRAS=extras/run_directory/
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will build udev_run_devd and udev_run_hotplugd, which can be called
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from a rule if needed:
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RUN+="/sbin/udev_run_hotplugd"
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The recommended way to handle this is to convert all the calls from
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the directories to explicit udev rules and get completely rid of the
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multiplexing. (To catch a ttyUSB event, you now no longer need to
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fork and exit 300 tty script instances you are not interested in, it
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is just one rule that matches exactly the device.)
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o udev handles now _all_ events not just events for class and block
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devices, this way it is possible to control the complete event
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behavior with udev rules. Especially useful for rules like:
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ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
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o As used in the modalias rule, udev supports now textual
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substitution placeholder along with the usual format chars. This
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needs to be documented, for now it's only visible in udev_rules_parse.c.
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o The rule keys support now more operations. This is documented in the
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man page. It is possible to add values to list-keys like the SYMLINK
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and RUN list with KEY+="value" and to clear the list by assigning KEY="".
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Also "final"-assignments are supported by using KEY:="value", which will
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prevent changing the key by any later rule.
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o kernel 2.6.12 has the "detached_state" attribute removed from
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sysfs, which was used to recognize sysfs population. We switched that
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to wait for the "bus" link, which is only available in kernels after 2.6.11.
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Running this udev version on older kernels may cause a short delay for
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some events.
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o To provide infrastructure for persistent device naming, the id programs:
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scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
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to export the probed data in environment key format:
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pim:~ # /sbin/ata_id --export /dev/hda
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ID_MODEL=HTS726060M9AT00
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ID_SERIAL=MRH401M4G6UM9B
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ID_REVISION=MH4OA6BA
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The following rules:
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KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
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KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
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Will create:
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kay@pim:~> tree /dev/disk
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/dev/disk
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|-- by-id
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| |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
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| `-- IBM-Memory_Key -> ../../sda
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|-- by-label
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| |-- swap -> ../../hda1
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| |-- date -> ../../sda1
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| `-- home -> ../../hda3
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`-- by-uuid
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|-- 2E08712B0870F2E7 -> ../../hda3
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|-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
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|-- E845-7A89 -> ../../sda1
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`-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
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The IMPORT= operation will import these keys in the environment and make
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it available for later PROGRAM= and RUN= executed programs. The keys are
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also stored in the udevdb and can be queried from there with one of the
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next udev versions.
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o A few binaries are silently added to the repository, which can be used
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to replay kernel events from initramfs instead of using coldplug. udevd
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can be instructed now to queue-up events while the stored events from
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initramfs are filled into the udevd-queue. This code is still under
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development and there is no documentation now besides the code itself.
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The additional binaries get compiled, but are not installed by default.
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o There is also a temporary fix for a performance problem where too many
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events happen in parallel and every event needs to parse the rules.
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udev can now read precompiled rules stored on disk. This is likely to be
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replaced by a more elegant solution in a future udev version.
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udev 058
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========
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With kernel version 2.6.12, the sysfs file "detached_state" was removed.
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Fix for libsysfs not to expect this file was added.
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udev 057
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========
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All rules are applied now, but only the first matching rule with a NAME-key
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@ -264,7 +264,7 @@ EOF
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devpath => "/block/sda",
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exp_name => "subdir/sys/node" ,
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rules => <<EOF
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BUS=="scsi", IMPORT="test.all", NAME="subdir%E{SYSFSDIR}/node"
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BUS=="scsi", IMPORT{file}="test.all", NAME="subdir%E{SYSFSDIR}/node"
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KERNEL=="ttyUSB0", NAME="visor"
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EOF
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},
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@ -274,7 +274,7 @@ EOF
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devpath => "/block/sda",
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exp_name => "node12345678",
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rules => <<EOF
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BUS=="scsi", IMPORT{exec}="/bin/echo -e \' TEST_KEY=12345678 \\n TEST_key2=98765 \'", NAME="node\$env{TEST_KEY}"
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BUS=="scsi", IMPORT="/bin/echo -e \' TEST_KEY=12345678 \\n TEST_key2=98765 \'", NAME="node\$env{TEST_KEY}"
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KERNEL=="ttyUSB0", NAME="visor"
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EOF
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},
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@ -377,9 +377,26 @@ static int rules_parse(const char *filename)
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if (strncasecmp(key, KEY_IMPORT, sizeof(KEY_IMPORT)-1) == 0) {
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attr = get_key_attribute(key + sizeof(KEY_IMPORT)-1);
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if (attr && strstr(attr, "exec")) {
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if (attr && strstr(attr, "program")) {
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dbg(KEY_IMPORT" will be executed");
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rule.import_exec = 1;
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} else if (attr && strstr(attr, "file")) {
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dbg(KEY_IMPORT" will be included as file");
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} else {
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/* figure it out if it is executable */
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char file[PATH_SIZE];
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char *pos;
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struct stat stats;
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strlcpy(file, value, sizeof(file));
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pos = strchr(file, ' ');
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if (pos)
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pos[0] = '\0';
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dbg(KEY_IMPORT" auto mode for '%s'", file);
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if (!lstat(file, &stats) && (stats.st_mode & S_IXUSR)) {
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dbg(KEY_IMPORT" is executable, will be executed");
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rule.import_exec = 1;
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}
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}
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strlcpy(rule.import, value, sizeof(rule.import));
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rule.import_operation = operation;
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