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systemd/units/modprobe@.service
Lennart Poettering 3c702e8210 condition: add new ConditionKernelModuleLoaded=
This introduces a new unit condition check: that matches if a specific
kmod module is allowed. This should be generally useful, but there's one
usecase in particular: we can optimize modprobe@.service with this and
avoid forking out a bunch of modprobe requests during boot for the same
kmods.

Checking if a kernel module is loaded is more complicated than just
checking if /sys/module/$MODULE/ exists, since kernel modules typically
take a while to initialize and we must check that this is complete (by
checking if the sysfs attr "initstate" is "live").
2024-12-12 05:03:52 +09:00

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# SPDX-License-Identifier: LGPL-2.1-or-later
#
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=Load Kernel Module %i
DefaultDependencies=no
Before=sysinit.target
Documentation=man:modprobe(8)
ConditionCapability=CAP_SYS_MODULE
ConditionKernelModuleLoaded=!%i
StartLimitIntervalSec=0
[Service]
Type=oneshot
ExecStart=-/sbin/modprobe -abq %i