-udev 131
+udev 138
+========
+Bugfixes.
+
+Device nodes can be watched for changes with inotify with OPTIONS="watch".
+If closed after being opened for writing, a "change" uevent will occur.
+/dev/disk/by-{label,uuid}/* symlinks will be automatically updated.
+
+udev 137
+========
+Bugfixes.
+
+The udevadm test command has no longer a --force option, nodes and symlinks
+are always updated with a test run now.
+
+The udevd daemon can be started with --resolve-names=never to avoid all user
+and group lookups (e.g. in cut-down systems) or --resolve-names=late to
+lookup user and groups every time events are handled.
+
+udev 136
+========
+Bugfixes.
+
+We are currently merging the Ubuntu rules in the udev default rules,
+and get one step closer to provide a common Linux /dev setup, regarding
+device names, symlinks, and default device permissions. On udev startup,
+we now expect the following groups to be resolvable to their ids with
+glibc's getgrnam():
+ disk, cdrom, floppy, tape, audio, video, lp, tty, dialout, kmem.
+LDAP setups need to make sure, that these groups are always resolvable at
+bootup, with only the rootfs mounted, and without network access available.
+
+Some systems may need to add some new, currently not used groups, or need
+to add some users to new groups, but the cost of this change is minimal,
+compared to the pain the current, rather random, differences between the
+various distributions cause for upstream projects and third-party vendors.
+
+In general, "normal" users who log into a machine should never be a member
+of any such group, but the device-access should be managed by dynamic ACLs,
+which get added and removed for the specific users on login/logout and
+session activity/inactivity. These groups are only provided for custom setups,
+and mainly system services, to allow proper privilege separation.
+A video-streaming daemon uid would be a member of "audio" and "video", to get
+access to the sound and video devices, but no "normal" user should ever belong
+to the "audio" group, because he could listen to the built-in microphone with
+any ssh-session established from the other side of the world.
+
+/dev/serial/by-{id,path}/ now contains links for ttyUSB devices,
+which do not depend on the kernel device name. As usual, unique
+devices - only a single one per product connected, or a real
+USB serial number in the device - are always found with the same
+name in the by-id/ directory.
+Completely identical devices may overwrite their names in by-id/
+and can only be found reliably in the by-path/ directory. Devices
+specified by by-path/ must not change their connection, like the
+USB port number they are plugged in, to keep their name.
+
+To support some advanced features, Linux 2.6.22 is the oldest supported
+version now. The kernel config with enabled SYSFS_DEPRECATED is no longer
+supported. Older kernels should still work, and devices nodes should be
+reliably created, but some rules and libudev will not work correctly because
+the old kernels do not provide the expected information or interfaces.
+
+udev 135
========
Bugfixes.
+Fix for a possible segfault while swapping network interface names in udev
+versions 131-134.
+
+udev 134
+========
+Bugfixes.
+
+The group "video" is part of the default rules now.
+
+udev 133
+========
+Bugfix for kernels using SYSFS_DEPRECATED* option and finding parent
+block devices in some cases. No common distro uses this option anymore,
+and we do not get enough testing for this and recent udev versions. If
+this option is not needed to run some old distro with a new kernel,
+it should be disabled in the kernel config.
+
+Bugfix for the $links substitution variable, which may crash if no links
+are created. This should not happen in usual setups because we always
+create /dev/{block,char}/ links.
+
+The strings of the parsed rules, which are kept in memory, no longer
+contain duplicate entries, or duplicate tails of strings. This, and the
+new rules parsing/matching code reduces the total in-memory size of
+a huge distro rule sets to 0.08 MB, compared to the 1.2MB of udev
+version 130.
+
+The export of DEVTYPE=disk/partition got removed from the default
+rules. This value is available from the kernel. The pnp shell script
+modprobe hack is removed from the default rules. ACPI devices have _proper_
+modalias support and take care of the same functionality.
+Installations which support old kernels, but install current default
+udev rules may want to add that to the compat rules file.
+
+Libvolume_id now always probes for all known filesystems, and does not
+stop at the first match. Some filesystems are marked as "exclusive probe",
+and if any other filesytem type matches at the same time, libvolume_id
+will, by default, not return any probing result. This is intended to prevent
+mis-detection with conflicting left-over signatures found from earlier
+file system formats. That way, we no longer depend on the probe-order
+in case of multiple competing signatures. In some setups the kernel allows
+to mount a volume with just the old filesystem signature still in place.
+This may damage the new filesystem and cause data-loss, just by mounting
+it. Because volume_id can not decide which one the correct signature is,
+the wrong signatures need to be removed manually from the volume, or the
+volume needs to be reformatted, to enable filesystem detection and possible
+auto-mounting.
+
+udev 132
+========
+Fix segfault if compiled without optimization and dbg() does not get
+compiled out and uses variables which are not available.
+
+udev 131
+========
+Bugfixes. (And maybe new bugs. :))
+
+The rule matching engine got converted from a rule list to a token
+array which reduced the in-memory rules representation of a full
+featured distros with thousends of udev rules from 1.2MB to 0.12 MB.
+Limits like 5 ENV and ATTR matches, and one single instance for most
+other keys per rule are gone.
+
+The NAME assignment is no longer special cased. If later rules assign
+a NAME value again, the former value will be overwritten. As usual
+for most other keys, the NAME value can be protected by doing a final
+assignment with NAME:="<value>".
+
+All udev code now uses libudev, which is also exported. The library
+is still under development, marked as experimental, and its interface
+may change as long as the DeviceKit integration is not finished.
+
+Many thanks to Alan Jenkins for his continuous help, and finding and
+optimizing some of the computing expensive parts.
+
udev 130
========
Bugfixes.
~ianmdlvl / elogind.git / blobdiff