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    Can't get udev rule to work on Ubuntu or Fedora

    Posts: 20
    edited February 2021 in Cloud Engineer IT Professional Program


    I can't get my udev rule to fire when I plug in a usb stick.

    I've tried many different rules, but the ones I've settled on here are in [6] in the screenshots.
    Also I tried with my fedora install usb, an RTL-SDR thing, and a freshly formatted USB stick with one ext4 partition.

    [1] - plugged in the usb stick and grep for SUBSYSTEM in udevadm info
    [2] - plugged in the usb stick and grep for DEVTYPE in udevadm info
    [3] - show the usbstick is there in lsblk
    [4] - cat out the script I plan to attach to my rule with RUN+=
    [5] - the script is in the right spot, /opt/script.sh. It's executable and owner/group is root
    [6] - cat out the rules. There are 2 different ones I tried
    [7] - run lsblk again. See the usb stick has been unplugged
    [8] - reload rules with udevadm control --reload
    [9] - show the usb stick has been reinserted.
    [10] - the script didnt work! It was supposed to create a file in /tmp

    back to poking around . . .

    Any tips appreciated!

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    Comments

    • Posts: 20

      NEVERMIND I believe I was missing the shebang #!/bin/sh at the top of the script.

      Not sure if there is a limitation on which interpreters can be put there?

      Anyway, after playing more now it works and the main change seems to be having added the #!/bin/sh at the top of the script.

    • Posts: 1,268

      Hi @MelvynDrag ,

      Not sure if there is a limitation on which interpreters can be put there?

      What do you mean? I see it more as a feature, because you can choose what shell you can use, and so use it's own features.

      Regards,
      Luis.

    • Posts: 20

      Yea I agree its great

      I meant I was wondering if it's possible to use any scripting language, like can I put #!/usr/bin/python3 and make it a python script? Or is it limited to certain shells or something.

      It was I think a dumb question in the middle of the night. I dont think it's restricted to /bin/sh or /usr/bin/bash or anything.

      A dumb question

      Thanks to you and coop for being so active in the forum, it's super helpful

    • Posts: 916

      I don't believe there is much restriction on the interpreter. Try it :)

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