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udev: communicate between two rules



The 2019 Stack Overflow Developer Survey Results Are In
Unicorn Meta Zoo #1: Why another podcast?
Announcing the arrival of Valued Associate #679: Cesar ManaraScript in udev rule doesn’t runudev rule to auto load keyboard layout when usb keyboard plugged inReloading udev rules failsWriting udev rulesUdev rules on Ubuntu/OMAP (Beaglebone)Udev rules failing to pass parametersudev rules ignore_deviceudev rules exclude deviceHow can I automatically format and write data to an SD card when it is plugged in? (Trigger systemd service on change rather than add.)why udev does not trigger remove event for mounted sdcard partitions?





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0















Is there a simple way to communicate between two different rules,
one for the ADD event, the other for the BIND event on the same device?



The ADD rule is executed first, afterwards comes the BIND rule. I would like to change how my BIND rule behaves, based on a variable set by the ADD rule.



What I tried so far:





  • I tried to use ENV{variable}="1" at the ADD rule and matching against it at the BIND rule using ENV{variable}=="1". Unfortunately this variable is not available in the BIND rule anymore, looks like the lifetime of those ENV variables is limited to only those rules on the same device and the same action (therefore only ADD rules).



    ACTION=="add", ENV{MODALIAS}=="abc", 
    ENV{variable}="1"

    ACTION=="bind", ENV{MODALIAS}=="abc",
    ENV{variable}=="1"

    ACTION=="bind", ENV{MODALIAS}=="abc",
    ENV{variable}=="2"


    I always thought that ENV variables are available everywhere in udev, but this seems to be wrong...




  • I also tried to set ATTR{foo}="bar" in the ADD rule and matching against it in the BIND rule using ATTRS{foo}=="bar". Doesn't work either.



    ACTION=="add", ENV{MODALIAS}=="abc", 
    ATTR{variable}="1"

    ACTION=="bind", ENV{MODALIAS}=="abc",
    ATTRS{variable}=="1"

    ACTION=="bind", ENV{MODALIAS}=="abc",
    ATTRS{variable}=="2"


    I have no idea why this doesn't work.








  • The only way that works so far is to echo the value of the variable into a file in the ADD rule (using RUN) and read it out in the BIND rule using PROGRAM and RESULT.



    ACTION=="add", ENV{MODALIAS}=="abc", 
    RUN+="/bin/bash -c 'echo "1" > /etc/udev/rules.d/variable'"

    ACTION=="bind", ENV{MODALIAS}=="abc",
    PROGRAM="/bin/bash -c 'cat /etc/udev/rules.d/variable'",
    RESULT=="1"

    ACTION=="bind", ENV{MODALIAS}=="abc",
    PROGRAM="/bin/bash -c 'cat /etc/udev/rules.d/variable'",
    RESULT=="2"



Any other ideas?










share|improve this question































    0















    Is there a simple way to communicate between two different rules,
    one for the ADD event, the other for the BIND event on the same device?



    The ADD rule is executed first, afterwards comes the BIND rule. I would like to change how my BIND rule behaves, based on a variable set by the ADD rule.



    What I tried so far:





    • I tried to use ENV{variable}="1" at the ADD rule and matching against it at the BIND rule using ENV{variable}=="1". Unfortunately this variable is not available in the BIND rule anymore, looks like the lifetime of those ENV variables is limited to only those rules on the same device and the same action (therefore only ADD rules).



      ACTION=="add", ENV{MODALIAS}=="abc", 
      ENV{variable}="1"

      ACTION=="bind", ENV{MODALIAS}=="abc",
      ENV{variable}=="1"

      ACTION=="bind", ENV{MODALIAS}=="abc",
      ENV{variable}=="2"


      I always thought that ENV variables are available everywhere in udev, but this seems to be wrong...




    • I also tried to set ATTR{foo}="bar" in the ADD rule and matching against it in the BIND rule using ATTRS{foo}=="bar". Doesn't work either.



      ACTION=="add", ENV{MODALIAS}=="abc", 
      ATTR{variable}="1"

      ACTION=="bind", ENV{MODALIAS}=="abc",
      ATTRS{variable}=="1"

      ACTION=="bind", ENV{MODALIAS}=="abc",
      ATTRS{variable}=="2"


      I have no idea why this doesn't work.








    • The only way that works so far is to echo the value of the variable into a file in the ADD rule (using RUN) and read it out in the BIND rule using PROGRAM and RESULT.



      ACTION=="add", ENV{MODALIAS}=="abc", 
      RUN+="/bin/bash -c 'echo "1" > /etc/udev/rules.d/variable'"

      ACTION=="bind", ENV{MODALIAS}=="abc",
      PROGRAM="/bin/bash -c 'cat /etc/udev/rules.d/variable'",
      RESULT=="1"

      ACTION=="bind", ENV{MODALIAS}=="abc",
      PROGRAM="/bin/bash -c 'cat /etc/udev/rules.d/variable'",
      RESULT=="2"



    Any other ideas?










    share|improve this question



























      0












      0








      0








      Is there a simple way to communicate between two different rules,
      one for the ADD event, the other for the BIND event on the same device?



      The ADD rule is executed first, afterwards comes the BIND rule. I would like to change how my BIND rule behaves, based on a variable set by the ADD rule.



      What I tried so far:





      • I tried to use ENV{variable}="1" at the ADD rule and matching against it at the BIND rule using ENV{variable}=="1". Unfortunately this variable is not available in the BIND rule anymore, looks like the lifetime of those ENV variables is limited to only those rules on the same device and the same action (therefore only ADD rules).



        ACTION=="add", ENV{MODALIAS}=="abc", 
        ENV{variable}="1"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        ENV{variable}=="1"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        ENV{variable}=="2"


        I always thought that ENV variables are available everywhere in udev, but this seems to be wrong...




      • I also tried to set ATTR{foo}="bar" in the ADD rule and matching against it in the BIND rule using ATTRS{foo}=="bar". Doesn't work either.



        ACTION=="add", ENV{MODALIAS}=="abc", 
        ATTR{variable}="1"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        ATTRS{variable}=="1"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        ATTRS{variable}=="2"


        I have no idea why this doesn't work.








      • The only way that works so far is to echo the value of the variable into a file in the ADD rule (using RUN) and read it out in the BIND rule using PROGRAM and RESULT.



        ACTION=="add", ENV{MODALIAS}=="abc", 
        RUN+="/bin/bash -c 'echo "1" > /etc/udev/rules.d/variable'"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        PROGRAM="/bin/bash -c 'cat /etc/udev/rules.d/variable'",
        RESULT=="1"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        PROGRAM="/bin/bash -c 'cat /etc/udev/rules.d/variable'",
        RESULT=="2"



      Any other ideas?










      share|improve this question
















      Is there a simple way to communicate between two different rules,
      one for the ADD event, the other for the BIND event on the same device?



      The ADD rule is executed first, afterwards comes the BIND rule. I would like to change how my BIND rule behaves, based on a variable set by the ADD rule.



      What I tried so far:





      • I tried to use ENV{variable}="1" at the ADD rule and matching against it at the BIND rule using ENV{variable}=="1". Unfortunately this variable is not available in the BIND rule anymore, looks like the lifetime of those ENV variables is limited to only those rules on the same device and the same action (therefore only ADD rules).



        ACTION=="add", ENV{MODALIAS}=="abc", 
        ENV{variable}="1"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        ENV{variable}=="1"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        ENV{variable}=="2"


        I always thought that ENV variables are available everywhere in udev, but this seems to be wrong...




      • I also tried to set ATTR{foo}="bar" in the ADD rule and matching against it in the BIND rule using ATTRS{foo}=="bar". Doesn't work either.



        ACTION=="add", ENV{MODALIAS}=="abc", 
        ATTR{variable}="1"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        ATTRS{variable}=="1"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        ATTRS{variable}=="2"


        I have no idea why this doesn't work.








      • The only way that works so far is to echo the value of the variable into a file in the ADD rule (using RUN) and read it out in the BIND rule using PROGRAM and RESULT.



        ACTION=="add", ENV{MODALIAS}=="abc", 
        RUN+="/bin/bash -c 'echo "1" > /etc/udev/rules.d/variable'"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        PROGRAM="/bin/bash -c 'cat /etc/udev/rules.d/variable'",
        RESULT=="1"

        ACTION=="bind", ENV{MODALIAS}=="abc",
        PROGRAM="/bin/bash -c 'cat /etc/udev/rules.d/variable'",
        RESULT=="2"



      Any other ideas?







      udev






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








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      asked yesterday









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