Exec bash file issue

General
1

Hello,

it's been a long time I try to execute a bash file in Node Red.
Node Red version : 4.0.2 running under docker.

The directory /usr/bin is correctly mounted but when I execute my script (with exec or exec-queue), the file is found but I have the execution error message:
"/usr/bin/gpio cannot execute: required file not found".

I try with a simple "ls" and it didn't works.

Could you help me please?

Thanks

2
  1. How is your exec node set up?
  2. Is that the exact error message that you get?
  3. Does the file /usr/bin/gpio exist? Is it an executable binary file or a script?
3

@jbudd

  1. the configuration of the noe :

    image
    image745×852 26.9 KB

  2. yes, it's exactly the message I have.

  3. The "startpwm.sh" file is in a mounted directory and recognized.
    The "startpwm.sh" file contains a list of calls of "/usr/bin/gpio" binary executable file with different options.

The script works fine out of Node-Red.

Many thanks

4

message deleted

5

I believe that the startpwm.sh script will run inside the container, therefore it will not have access to /usr/bin.

If you exec ls -al and pwd what do they show? I suspect you will find they show a container directory.

6

The directory contains the startpwm.sh and the /user/bin are mounted and available in the docker container.

When I execute ls -la I have the same error message.

7

How do you know that?

Exactly what error?

8

The result of "docker inspect" command:

image
image904×34 29.9 KB

We can see the two directories mounted : "/usr/bin" and "/var/lib/node-red" (/data)
Is possible a right access problem? I don't think about that because the error message would have been "not access right" no?
A bad bind propagation ? I specify rprivate (default value) but it could be the wrong one.
I try with shared without success.

The error when "/usr/bin/ls" is executed:
image

I copy "startpwm.sh" in /var/lib/node-red and call "/data/startpwm.sh" in exec node with the same result:
image

Many thanks

9

message deleted

10

New information, always with the exec node:

I try to execute "/bin/ls -la" (without /usr) with success:
image

The result with the command "/bin/ls -la /usr/bin/gpi*"
image
"/usr/bin/" is available in docker

The result with the command "/bin/ls -la /home/pi"
image
Normal, "/home/pi" is not mounted.

I added the "/sys/class/gpio" directory in mounted list without success.
The call to "/usr/bin/gpio" return the same error:
image

11

Use the docker exec command to check that you can run the commands. That will tell you whether it is a docker issue or a node-red issue.

12

the result:

image
image848×29 25.5 KB

but

image
image978×62 41.7 KB

lack of dependences (lib or someone else) ?

13

Please don't screenshot, copy/paste instead, it is much easier to understand.

What does cat /usr/bin/gpio give you, using docker exec?

14

ok for screen shot, sorry.

it's a binary file but at the end there is a reference to a library:
/usr/lib/gcc/arm-linux-gnueabihf/4.9/../../../arm-linux-gnueabihf/crt1.o$d$a

I tried to mount /usr/lib in container but it doesn't work (container don't start).

15

OK, so is a docker issue, not node red. I don't have any other suggestions, apart from not using Docker. Unless you know a lot about Docker it just makes life difficult.

16

Thanks a lot @Colin, I will see on Docker side.
Have a good day