systemd-stable/RELEASE-NOTES

udev 057
========
All rules are applied now, but only the first matching rule with a NAME-key
will be applied. All later rules with NAME-key are completely ignored. This
way system supplied symlinks or permissions gets applied to user-defined
naming rules.

Note:
Please check your rules setup, if you may need to add OPTIONS="last_rule"
to some rules, to keep the old behavior.

The rules are read on "remove"-events too. That makes is possible to match
with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
instruct udev to ignore an event (OPTIONS="ignore_device").
The new ACTION-key may be used to let a rule act only at a "remove"-event.

The new RUN-key supports rule-based execution of programs after device-node
handling. This is meant as a general replacement for the dev.d/-directories
to give fine grained control over the execution of programs.

The %s{}-sysfs format char replacement values are searched at any of the
devices in the device chain now, not only at the class-device.

We support log priority levels now. The value udev_log in udev.conf is used
to determine what is printed to syslog. This makes it possible to
run a version with compiled-in debug messages in a production environment
which is sometimes needed to find a bug.
It is still possible to supress the inclusion of _any_ syslog usage with
USE_LOG=false to create the smallest possible binaries if needed.
The configured udev_log value can be overridden with the environment variable
UDEV_LOG.

udev 056
========
Possible use of a system-wide klibc:
  make USE_KLIBC=true KLCC=/usr/bin/klcc all
will link against an external klibc and our own version will be ignored.

udev 055
========
We support an unlimited count of symlinks now.

If USE_STATIC=true is passed to a glibc build, we link statically and use
a built-in userdb parser to resolve user and group names.

The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
we walk up the chain of physical devices to find a match.

The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
easy to skip certain attribute matches without composing rules with weird
character class negations like:
  KERNEL="[!s][!c][!d]*"
this can now be replaced with:
  KERNEL!="scd*"
The current simple '=' is still supported, and should work as it does today,
but existing rules should be converted if possible, to be better readable.

We have new ENV{}== key now, to match against a maximum of 5 environment
variables.

udevstart is its own binary again, cause we don't need co carry this araound
with every forked event.