X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=NEWS;h=8b51c10a84bdbd208319d075ba412002df98eccb;hp=ab5b8cac0e2202825b9d9e04f8af5db9ba911760;hb=45798927f8532cd412622e9762619b46a9b638cd;hpb=d78c0b3a5b15fa1be9c70b99f91a026d0a43826a diff --git a/NEWS b/NEWS index ab5b8cac0..8b51c10a8 100644 --- a/NEWS +++ b/NEWS @@ -1,3 +1,152 @@ +udev 143 +======== +Bugfixes. + +Event processes now get re-used after they handled an event. This reduces +pressure on the CPU significantly because cloned event processes no longer +cause page faults in the main daemon. After the events have settled, the +no longer needed worker processes get killed. + +To be able to use signalfd(), udev depends on kernel version 2.6.25 now. +Also inotify support is required now to run udev. + +The format of the queue exported by the udev damon has changed. There is +no longer a /dev/.udev/queue/ directory. The current event queue can be +accessed with udevadm settle and libudedv. + +udev 142 +======== +Bugfixes. + +The program vol_id and the library libvolume_id are removed from the +repository. Libvolume_id is merged with libblkid from the util-linux-ng +package. Persistent disk links for label and uuid depend on the +util-linux-ng version (2.15) of blkid now. Older versions of blkid +can not be used with udev. + +Libudev allows to subscribe to udev events. To prevent unwanted messages +to be delivered, and waking up the subscribing process, a filter can be +installed, to drop messages inside a kernel socket filter. The filters +match on the : properties of the device. + This is part of the ongoing effort to replace HAL, and switch current +users over to directly use libudev. + Libudev is still marked as experimental, and its interface might +eventually change if needed, but no major changes of the currently exported +interface are expected anymore, and a first stable release should happen +soon. + +A too old kernel (2.6.21) or a kernel with CONFIG_SYSFS_DEPRECATED +is not supported since while and udevd will log an error message at +startup. It should still be able to boot-up, but advanced rules and system +services which depend on the information not available in the old sysfs +format will fail to work correctly. + +DVB device naming is supplied by the kernel now. In case older kernels +need to be supported, the old shell script should be added to a compat +rules file. + +udev 141 +======== +Bugfixes. + +The processed udev events get send back to the netlink socket. Libudev +provides access to these events. This is work-in-progress, to replace +the DeviceKit daemon functionality directly with libudev. There are +upcoming kernel changes to allow non-root users to subcribe to these +events. + +udev 140 +======== +Bugfixes. + +"udevadm settle" now optionally accepts a range of events to wait for, +instead of waiting for "all" events. + +udev 139 +======== +Bugfixes. + +The installed watch for block device metadata changes is now removed +during event hadling, because some (broken) tools may be called from udev +rules and (wrongly) open the device with write access. After the finished +event handling the watch is restored. + +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 @@ -39,7 +188,6 @@ auto-mounting. udev 132 ======== - Fix segfault if compiled without optimization and dbg() does not get compiled out and uses variables which are not available.