bash script not works with external commands

modsley · July 2018

Hello everyone.
when I run bash script from external commands nothing happens.

Script to turn on the printer

#!/bin/bash
if [ ! -d /sys/class/gpio/gpio17 ]
then
  echo "17" > /sys/class/gpio/export
  sleep 1;
fi
echo "out" > /sys/class/gpio/gpio17/direction
echo "1" > /sys/class/gpio/gpio17/value

When I run it from console it works.

In extcommands.xml

<execute>/var/lib/Repetier-Server/database/turnOnPrinter.sh</execute>

I added /bin/bash to sudoers.d

# echo "repetierserver ALL=NOPASSWD: /bin/bash" > /etc/sudoers.d/repetierserver-bash

When I run external command nothing happens. Log says
Starting external command /var/lib/Repetier-Server/database/turnOnPrinter.sh with 0 parameters.
Tried

<execute>sudo /var/lib/Repetier-Server/database/turnOnPrinter.sh</execute>

with same result.

Thank you for help.

Repetier · July 2018

Did your echo create the file? # is a comment so not sure you entered it or not.
You are not starting /bin/bash but you start /var/lib/Repetier-Server/database/turnOnPrinter.sh so that should be executable.

echo "repetierserver ALL=NOPASSWD: /var/lib/Repetier-Server/database/turnOnPrinter.sh
" > /etc/sudoers.d/repetierserver-turnon

Then the version with sudo. But remember to restart server before testing or it will not use the sudo version.

modsley · July 2018

pi@raspberrypi:~ $ sudo -u repetierserver /var/lib/Repetier-Server/database/turnOnPrinter.sh

/var/lib/Repetier-Server/database/turnOnPrinter.sh: line 5: /sys/class/gpio/export: Permission denied

/var/lib/Repetier-Server/database/turnOnPrinter.sh: line 8: /sys/class/gpio/gpio17/direction: Permission denied

/var/lib/Repetier-Server/database/turnOnPrinter.sh: line 9: /sys/class/gpio/gpio17/value: Permission denied

The cure is
usermod -a -G gpio repetierserver

Repetier · July 2018

Ok, also a good solution. Even better because it does not require root permissions to execute the script.

bash script not works with external commands

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