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99d3dd2ba7
Linux kernel will, as documented in drivers/video/backlight/backlight.c, report changes to a backlights brightness as a uevent (ACTION=change). systemd-udev will consume the uevent, match on this rule and try to activate the systemd-backlight service for the backlight. BUT when systemd is not compiled with backlight support, this will lead to failure that is reported in the journal. Since the failure to activate systemd-backlight and subsequent failure log entry happens on every backlight brightness change, we found the resulting logspam during regular operation excessive and came up with this patch to mitigate it. The conditional is also extended to "*kbd_backlight" match, since even though we did not investigate to see if the logspam would be similar, the unconditional match to activate systemd-backlight here would also not make sense when the feature is not compiled in. Signed-off-by: Simon Braunschmidt <simon.braunschmidt@iba-group.com>
85 lines
5 KiB
Plaintext
85 lines
5 KiB
Plaintext
# SPDX-License-Identifier: LGPL-2.1-or-later
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#
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# This file is part of systemd.
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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ACTION=="remove", GOTO="systemd_end"
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SUBSYSTEM=="tty", KERNEL=="tty[a-zA-Z]*|hvc*|xvc*|hvsi*|ttysclp*|sclp_line*|3270/tty[0-9]*", TAG+="systemd"
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KERNEL=="vport*", TAG+="systemd"
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SUBSYSTEM=="ubi", TAG+="systemd"
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SUBSYSTEM=="block", TAG+="systemd"
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# We can't make any conclusions about suspended DM devices so let's just import previous SYSTEMD_READY state and skip other rules
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SUBSYSTEM=="block", ENV{DM_SUSPENDED}=="1", IMPORT{db}="SYSTEMD_READY", GOTO="systemd_end"
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SUBSYSTEM=="block", ACTION=="add", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}=="1", ENV{SYSTEMD_READY}="0"
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# Ignore encrypted devices with no identified superblock on it, since
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# we are probably still calling mke2fs or mkswap on it.
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SUBSYSTEM=="block", ENV{DM_UUID}=="CRYPT-*", ENV{ID_PART_TABLE_TYPE}=="", ENV{ID_FS_USAGE}=="", ENV{SYSTEMD_READY}="0"
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# Explicitly set SYSTEMD_READY=1 for DM devices that don't have it set yet, so that we always have something to import above
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SUBSYSTEM=="block", ENV{DM_UUID}=="?*", ENV{SYSTEMD_READY}=="", ENV{SYSTEMD_READY}="1"
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# add symlink to GPT root disk
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SUBSYSTEM=="block", ENV{ID_PART_GPT_AUTO_ROOT}=="1", ENV{ID_FS_TYPE}!="crypto_LUKS", SYMLINK+="gpt-auto-root"
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SUBSYSTEM=="block", ENV{ID_PART_GPT_AUTO_ROOT}=="1", ENV{ID_FS_TYPE}=="crypto_LUKS", SYMLINK+="gpt-auto-root-luks"
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SUBSYSTEM=="block", ENV{DM_UUID}=="CRYPT-*", ENV{DM_NAME}=="root", SYMLINK+="gpt-auto-root"
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# Ignore raid devices that are not yet assembled and started
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SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", KERNEL=="md*", TEST!="md/array_state", ENV{SYSTEMD_READY}="0"
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SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", KERNEL=="md*", ATTR{md/array_state}=="|clear|inactive", ENV{SYSTEMD_READY}="0"
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# Ignore loop devices that don't have any file attached
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SUBSYSTEM=="block", KERNEL=="loop[0-9]*", ENV{DEVTYPE}=="disk", TEST!="loop/backing_file", ENV{SYSTEMD_READY}="0"
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# Ignore nbd devices until the PID file exists (which signals a connected device)
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SUBSYSTEM=="block", KERNEL=="nbd*", ENV{DEVTYPE}=="disk", TEST!="pid", ENV{SYSTEMD_READY}="0"
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# We need a hardware independent way to identify network devices. We
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# use the /sys/subsystem/ path for this. Kernel "bus" and "class" names
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# should be treated as one namespace, like udev handles it. This is mostly
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# just an identification string for systemd, so whether the path actually is
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# accessible or not does not matter as long as it is unique and in the
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# filesystem namespace.
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SUBSYSTEM=="net", KERNEL!="lo", TAG+="systemd", ENV{SYSTEMD_ALIAS}+="/sys/subsystem/net/devices/$name"
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SUBSYSTEM=="bluetooth", TAG+="systemd", ENV{SYSTEMD_ALIAS}+="/sys/subsystem/bluetooth/devices/%k", \
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ENV{SYSTEMD_WANTS}+="bluetooth.target", ENV{SYSTEMD_USER_WANTS}+="bluetooth.target"
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ENV{ID_SMARTCARD_READER}=="?*", TAG+="systemd", ENV{SYSTEMD_WANTS}+="smartcard.target", ENV{SYSTEMD_USER_WANTS}+="smartcard.target"
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SUBSYSTEM=="sound", KERNEL=="controlC*", TAG+="systemd", ENV{SYSTEMD_WANTS}+="sound.target", ENV{SYSTEMD_USER_WANTS}+="sound.target"
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SUBSYSTEM=="printer", TAG+="systemd", ENV{SYSTEMD_WANTS}+="printer.target", ENV{SYSTEMD_USER_WANTS}+="printer.target"
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SUBSYSTEM=="usb", KERNEL=="lp*", TAG+="systemd", ENV{SYSTEMD_WANTS}+="printer.target", ENV{SYSTEMD_USER_WANTS}+="printer.target"
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SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ENV{ID_USB_INTERFACES}=="*:0701??:*", TAG+="systemd", ENV{SYSTEMD_WANTS}+="printer.target", ENV{SYSTEMD_USER_WANTS}+="printer.target"
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SUBSYSTEM=="udc", ACTION=="add", TAG+="systemd", ENV{SYSTEMD_WANTS}+="usb-gadget.target"
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# Apply sysctl variables to network devices (and only to those) as they appear.
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ACTION=="add", SUBSYSTEM=="net", KERNEL!="lo", RUN+="{{ROOTLIBEXECDIR}}/systemd-sysctl --prefix=/net/ipv4/conf/$name --prefix=/net/ipv4/neigh/$name --prefix=/net/ipv6/conf/$name --prefix=/net/ipv6/neigh/$name"
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{% if ENABLE_BACKLIGHT %}
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# Pull in backlight save/restore for all backlight devices and
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# keyboard backlights
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SUBSYSTEM=="backlight", TAG+="systemd", IMPORT{builtin}="path_id", ENV{SYSTEMD_WANTS}+="systemd-backlight@backlight:$name.service"
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SUBSYSTEM=="leds", KERNEL=="*kbd_backlight", TAG+="systemd", IMPORT{builtin}="path_id", ENV{SYSTEMD_WANTS}+="systemd-backlight@leds:$name.service"
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{% endif %}
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# Pull in rfkill save/restore for all rfkill devices
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SUBSYSTEM=="rfkill", ENV{SYSTEMD_RFKILL}="1"
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SUBSYSTEM=="rfkill", IMPORT{builtin}="path_id"
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SUBSYSTEM=="misc", KERNEL=="rfkill", TAG+="systemd", ENV{SYSTEMD_WANTS}+="systemd-rfkill.socket"
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# Asynchronously mount file systems implemented by these modules as soon as they are loaded.
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SUBSYSTEM=="module", KERNEL=="fuse", TAG+="systemd", ENV{SYSTEMD_WANTS}+="sys-fs-fuse-connections.mount"
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SUBSYSTEM=="module", KERNEL=="configfs", TAG+="systemd", ENV{SYSTEMD_WANTS}+="sys-kernel-config.mount"
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LABEL="systemd_end"
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