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[be8e4d]: / create_gpio_user_permissions.py  Maximize  Restore  History

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import grp

import subprocess



def ensure_gpiogroup():

    try:

        grp.getgrnam('gpio')

    except KeyError:

        print('GPIO group does not exist - creating...')

        subprocess.call(['groupadd', '-f', '-r', 'gpio'])

        subprocess.call(['adduser', 'pi', 'gpio'])

        # in future, also for groups:

        #   spi

        #   i2c

        add_udev_rules()



def add_udev_rules():

    with open('/etc/udev/rules.d/99-gpio.rules','w') as f:

        f.write("""SUBSYSTEM=="bcm2835-gpiomem", KERNEL=="gpiomem", GROUP="gpio", MODE="0660"

SUBSYSTEM=="gpio", KERNEL=="gpiochip*", ACTION=="add", PROGRAM="/bin/sh -c 'chown root:gpio /sys/class/gpio/export /sys/class/gpio/unexport ; chmod 220 /sys/class/gpio/export /sys/class/gpio/unexport'"

SUBSYSTEM=="gpio", KERNEL=="gpio*", ACTION=="add", PROGRAM="/bin/sh -c 'chown root:gpio /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value ; chmod 660 /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value'"

""")



if __name__ == '__main__':

    ensure_gpiogroup()
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