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String substitutions in OWNER and GROUP keys were broken in udev 137-142.
Explicitly test for this, since such breakage will not manifest in typical
rulesets.
The in-memory rule array of a common desktop distro install took:
1151088 bytes
with the token list:
109232 bytes tokens (6827 * 16 bytes), 71302 bytes buffer
None of these rules is supposed to be changed by users, so move
them out of /etc. Custom rules, and automatically generated rules
stay in /etc. All rules are still processed in lexical order,
regardless which directory they live in.
Do substitition processing in MODE field, similar to substitution in
OWNER, GROUP etc fields. Add test case for normal and overflow behaviour.
Document in manpage.
This scheme is more consistent and makes it obvious if a match happens
against the event device only, or the full chain of parent devices.
The old key names are now:
BUS -> SUBSYSTEMS
ID -> KERNELS
SYSFS -> ATTRS
DRIVER -> DRIVERS
Match keys for the event device:
KERNEL
SUBSYSTEM
ATTR
DRIVER (in a future release, for now the same as DRIVERS)
Match keys for all devices along the parent device chain:
KERNELS
SUBSYSTEMS
ATTRS
DRIVERS
ID, BUS, SYSFS are no longer mentioned in the man page but still work.
DRIVER must be converted to DRIVERS to match the new scheme. For now,
an error is logged, if DRIVER is used. In a future release, the DRIVER
key behaviour will change.
Consecutive "add" events will not remove and recreate the same symlinks
anymore. No longer valid links, like after changing a filesystem label,
will still be removed.
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>
All udev state is kept in /$udev_root/.udev/ now. No option to
configure that anymore, it will always be there.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
No device node or symlink can have other characters as plain
readable ascii or valid utf8. The /dev/disk/by-label/* symlinks
can no longer contain weird stuff read from untrusted sources.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
