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Apply substitutions before running a program, not while the rule
is parsed. It allows to use environment variables set during rule
processing as command arguments.
We never used any of the libsysfs convenience features. Here we replace
it completely with 300 lines of code, which are much simpler and a bit
faster cause udev(d) does not open any syfs file for a simple event which
does not need any parent device information.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
It was a workaround for speed up udev "coldplug", where ~800 events
happened a second time during bootup. No need for it with the rules
aleady parsed in the daemon.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Rules can be precompiled and stored on disk for initramfs, to avoid
parsing the rules with every event again and again. Also the OWNER and
GROUP names are already resolved to numerical values in the compiled
rules. This flag is used for the upcoming move of the rules parsing
into udevd:
If the real root is mounted udevd is started and parses the rules
only once. The event processes will inherit the already parsed rules
from the daemon, so we want to ignore any precompiled rules and
use the real rules files and watch the filesystem for changes to
reload the rules automatically.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
This will allow us to have whole blocks of rules to skip
conditionally. The following section creates the node "yes":
GOTO="TEST"
NAME="no"
NAME="no2", LABEL="NO"
NAME="yes", LABEL="TEST"
NAME="no3"
This cuts down our 600 rules file to 98 kb instead of 1.9 Mb memory
or file-size with precompiled rules.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
This allows to source-in a file into the udev environment to have
the defined keys available for later processing by udev itself or
the forked helper programs.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
All the rule files can be compiled into a single file,
which can be mapped into the udev process to avoid parsing
the rules with every event.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Handle all events with rules. If udev is expected to handle hotplug.d/
the exernal helper must be called.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
SUBSYSTEM=="block", RUN="/sbin/program"
will execute the program only for block device events.
ACTION="remove", SUBSYSTEM=="block", RUN"/sbin/program"
will execute the program, if a block device is removed.
