실제 다시 시작하는 동안 udev 규칙이 절대 실행되지 않는데 'udevadmin 테스트' 결과가 여전히 괜찮은 이유는 무엇입니까?

내 예제 규칙은 다음과 같습니다.

cat /etc/udev/rules.d/55-battery-charge.rules 
ACTION=="add|change", KERNEL=="BAT*", SUBSYSTEM=="power_supply", ATTR{charge_control_end_threshold}="60"

udevadm test /sys/class/power_supply/BAT0잘 작동합니다:

BAT0: /etc/udev/rules.d/55-battery-charge.rules:1 ATTR '/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:20/PNP0C09:01/PNP0C0A:03/power_supply/BAT0/charge_control_end_threshold' writing '60'
BAT0: /etc/udev/rules.d/55-battery-charge.rules:1 Failed to write ATTR{/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:20/PNP0C09:01/PNP0C0A:03/power_supply/BAT0/charge_control_end_threshold}, ignoring: Permission denied
DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:20/PNP0C09:01/PNP0C0A:03/power_supply/BAT0
...
ACTION=add
SUBSYSTEM=power_supply
USEC_INITIALIZED=2126021481
...

실제로 시작되었을 때 udev 디버그 로그에는 BAT0에 대한 트리거 규칙이 표시되지 않았습니다.

journalctl -b 0 -u systemd-udevd | grep BAT0
systemd-udevd[591]: BAT0: Device (SEQNUM=4977, ACTION=add) is queued
systemd-udevd[591]: BAT0: sd-device-monitor: Passed 734 byte to netlink monitor
systemd-udevd[668]: BAT0: Processing device (SEQNUM=4977, ACTION=add)
systemd-udevd[668]: BAT0: Device (SEQNUM=4977, ACTION=add) processed
systemd-udevd[668]: BAT0: sd-device-monitor: Passed 734 byte to netlink monitor

initramfs를 수행했고 부팅 시 규칙이 로드되었습니다.

systemd-udevd[591]: Reading rules file: /etc/udev/rules.d/55-battery-charge.rules

이상한 점은 제거하면 SUBSYSTEM=="power_supply"중간에 작동한다는 것입니다.

systemd-udevd[589]: BAT0: Device (SEQNUM=4976, ACTION=add) is queued
systemd-udevd[589]: BAT0: sd-device-monitor: Passed 735 byte to netlink monitor
systemd-udevd[667]: BAT0: Processing device (SEQNUM=4976, ACTION=add)
systemd-udevd[667]: BAT0: /etc/udev/rules.d/55-battery-charge.rules:1 ATTR '/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:20/PNP0C09:01/PNP0C0A:03/power_supply/BAT0/charge_control_end_threshold' writing '60'
systemd-udevd[667]: BAT0: /etc/udev/rules.d/55-battery-charge.rules:1 Failed to write ATTR{/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:20/PNP0C09:01/PNP0C0A:03/power_supply/BAT0/charge_control_end_threshold}, ignoring: No such file or directory
systemd-udevd[667]: BAT0: Device (SEQNUM=4976, ACTION=add) processed
systemd-udevd[667]: BAT0: sd-device-monitor: Passed 735 byte to netlink monitor

BAT0이 추가되었을 때 Charge_control_end_threshold sysfs가 아직 존재하지 않았던 것 같습니다. 임계값 파일이 공개된 경우에만 발생하는지 어떻게 확인합니까?

흠... 이제 이해합니다. 다른 커널 모듈은 실제로 BAT0 이후에 해당 매개변수를 노출합니다.