run

#!/usr/bin/with-contenv bash
# shellcheck shell=bash

FILES=$(find /dev/ttyACM* /dev/ttyUSB* -type c -print 2>/dev/null)

for i in $FILES; do
    USB_GID=$(stat -c '%g' "${i}")
    USB_UID=$(stat -c '%u' "${i}")
    # check if user matches device
    if id -u abc | grep -qw "${USB_UID}"; then
        echo "**** permissions for ${i} are good ****"
    else
        # check if group matches and that device has group rw
        if id -G abc | grep -qw "${USB_GID}" && [ $(stat -c '%A' "${i}" | cut -b 5,6) = "rw" ]; then
            echo "**** permissions for ${i} are good ****"
        # check if device needs to be added to USB group
        elif ! id -G abc | grep -qw "${USB_GID}"; then
            # check if USB group needs to be created
            USB_NAME=$(getent group "${USB_GID}" | awk -F: '{print $1}')
            if [ -z "${USB_NAME}" ]; then
                USB_NAME="usb$(head /dev/urandom | tr -dc 'a-z0-9' | head -c4)"
                groupadd "${USB_NAME}"
                groupmod -g "${USB_GID}" "${USB_NAME}"
                echo "**** creating USB group ${USB_NAME} with id ${USB_GID} ****"
            fi
            echo "**** adding ${i} to USB group ${USB_NAME} with id ${USB_GID} ****"
            usermod -a -G "${USB_NAME}" abc
        fi
        # check if device has group rw
        if [ $(stat -c '%A' "${i}" | cut -b 5,6) != "rw" ]; then
            echo -e "**** The device ${i} does not have group read/write permissions, attempting to fix inside the container. ****"
            chmod g+rw "${i}"
        fi
    fi
done