docker-plex/root/etc/s6-overlay/s6-rc.d/init-plex-gid-video/run

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

FILES=$(find /dev/dri /dev/dvb -type c -print 2>/dev/null)

for i in ${FILES}; do
    VIDEO_GID=$(stat -c '%g' "${i}")
    VIDEO_UID=$(stat -c '%u' "${i}")
    # check if user matches device
    if id -u abc | grep -qw "${VIDEO_UID}"; then
        echo "**** permissions for ${i} are good ****"
    else
        # check if group matches and that device has group rw
        if id -G abc | grep -qw "${VIDEO_GID}" && [[ $(stat -c '%A' "${i}" | cut -b 5,6) == "rw" ]]; then
            echo "**** permissions for ${i} are good ****"
        # check if device needs to be added to video group
        elif ! id -G abc | grep -qw "${VIDEO_GID}"; then
            # check if video group needs to be created
            VIDEO_NAME=$(getent group "${VIDEO_GID}" | awk -F: '{print $1}')
            if [[ -z "${VIDEO_NAME}" ]]; then
                VIDEO_NAME="video$(head /dev/urandom | tr -dc 'a-z0-9' | head -c4)"
                groupadd "${VIDEO_NAME}"
                groupmod -g "${VIDEO_GID}" "${VIDEO_NAME}"
                echo "**** creating video group ${VIDEO_NAME} with id ${VIDEO_GID} ****"
            fi
            echo "**** adding ${i} to video group ${VIDEO_NAME} with id ${VIDEO_GID} ****"
            usermod -a -G "${VIDEO_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