udev: communicate between two rules The 2019 Stack Overflow Developer Survey Results Are In ...
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udev: communicate between two rules
The 2019 Stack Overflow Developer Survey Results Are In
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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 usingENV{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 usingATTRS{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
echothe value of the variable into a file in the ADD rule (usingRUN) and read it out in the BIND rule usingPROGRAMandRESULT.
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
asked yesterday
tollotollo
1457
add a comment |
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 usingENV{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 usingATTRS{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
echothe value of the variable into a file in the ADD rule (usingRUN) and read it out in the BIND rule usingPROGRAMandRESULT.
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
asked yesterday
tollotollo
1457
add a comment |
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 usingENV{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 usingATTRS{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
echothe value of the variable into a file in the ADD rule (usingRUN) and read it out in the BIND rule usingPROGRAMandRESULT.
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
asked yesterday
tollotollo
1457
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 usingENV{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 usingATTRS{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
echothe value of the variable into a file in the ADD rule (usingRUN) and read it out in the BIND rule usingPROGRAMandRESULT.
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
udev
asked yesterday
tollotollo
1457
asked yesterday
tollotollo
1457
edited yesterday
tollo
asked yesterday
tollotollo
1457
asked yesterday
tollotollo
1457
asked yesterday
tollotollo
1457
1457
add a comment |
add a comment |
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