Linux
udev 規則執行 2 次
我寫了一個這樣的udev規則：
SUBSYSTEM=="usb", ACTION=="add", RUN+="//root/usbmon/usb add %b" SUBSYSTEM=="usb", ACTION=="remove", RUN+="//root/usbmon/usb remove %b"現在，只要連接和移除 USB，這個 USB 腳本就會發送電子郵件。
但問題是它每次發送 2 封電子郵件。這意味著規則正在執行 2 次。這就是我在日誌中得到的
Apr 26 14:52:00 box2 sendEmail[3374]: Email was sent successfully! USB Added: Email sent to box2@dmz.domain.com Using Udev Rule at 04-26-14-52-00. Apr 26 14:52:00 box2 sendEmail[3394]: Email was sent successfully! USB Added: Email sent to box2@dmz.domain.com Using Udev Rule at 04-26-14-52-00.我不知道它為什麼執行 2 次以及如何阻止它工作一次？我已經驗證該問題在 udev 結束，但不知道如何解決。這是連接 USB 時 udev 監視器的輸出：
KERNEL[1335803018.283341] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4 (usb) KERNEL[1335803018.284456] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0 (usb) KERNEL[1335803018.284835] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6 (scsi) KERNEL[1335803018.284863] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/scsi_host/host6 (scsi_host) KERNEL[1335803023.524167] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0 (scsi) KERNEL[1335803023.524735] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0 (scsi) KERNEL[1335803023.525043] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/scsi_disk/6:0:0:0 (scsi_disk) KERNEL[1335803023.525154] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/scsi_device/6:0:0:0 (scsi_device) KERNEL[1335803023.525505] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/scsi_generic/sg6 (scsi_generic) KERNEL[1335803023.525792] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/bsg/6:0:0:0 (bsg) KERNEL[1335803023.526534] add /devices/virtual/bdi/8:80 (bdi) UDEV [1335803023.526895] add /devices/virtual/bdi/8:80 (bdi) KERNEL[1335803023.543043] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/block/sdf (block) KERNEL[1335803023.543166] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/block/sdf/sdf1 (block) UDEV [1335803028.541785] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4 (usb) UDEV [1335803038.850181] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0 (usb) UDEV [1335803038.850423] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6 (scsi) UDEV [1335803038.850541] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0 (scsi) UDEV [1335803038.850568] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/scsi_host/host6 (scsi_host) UDEV [1335803038.851736] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0 (scsi) UDEV [1335803038.851912] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/scsi_disk/6:0:0:0 (scsi_disk) UDEV [1335803038.861401] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/scsi_device/6:0:0:0 (scsi_device) UDEV [1335803038.862757] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/bsg/6:0:0:0 (bsg) UDEV [1335803038.863880] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/scsi_generic/sg6 (scsi_generic) UDEV [1335803039.002743] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/block/sdf (block) UDEV [1335803039.072845] add /devices/pci0000:00/0000:00:1a.7/usb1/1-4/1-4:1.0/host6/target6:0:0/6:0:0:0/block/sdf/sdf1 (block)現在上面的輸出清楚地表明 udev 在 10 秒後再次附加設備，那是我再次收到電子郵件的時間（10 秒後）。同樣，當腳本不可執行時，我在日誌文件中收到以下消息 2 次：
Apr 30 10:22:37 box2 udevd-work[1990]: exec of program '/root/usbmon/usb' failed Apr 30 10:22:37 box2 udevd-work[1991]: exec of program '/root/usbmon/usb' failed現在我想知道我需要更改這些設置以使 udev 執行一次。我已經在 2 台伺服器上驗證了同樣的事情。CentOS 和 ubuntu。
該問題已通過添加
ENV{DEVTYPE}=="usb_device"規則解決。
我猜您的規則與
/dev/sdf設備匹配，但也與第一個分區匹配/dev/sdf1，因此它被觸發了兩次。如果你只想匹配
/dev/sdf1，你可以嘗試類似KERNEL=="sd*1".