Add script to set appropriate permissions on /dev/dri/* devices

init/07_set_dri_permissions.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+#
+# Script to set up permissions on hardware devices for GPU support.
+# Inspired by how the guys over at linuxserver did this for their Plex image:
+# https://github.com/linuxserver/docker-plex/blob/master/root/etc/cont-init.d/50-gid-video
+#
+
+echo "Granting permissions on /dev/dri/* devices..."
+
+FILES=$(find /dev/dri /dev/dvb -type c -print 2>/dev/null)
+
+for i in $FILES
+do
+	VIDEO_GID=$(stat -c '%g' "$i")
+	if id -G www-data | grep -qw "$VIDEO_GID"; then
+		echo "The www-data user already has appropriate permissions on $i"
+		touch /groupadd
+	else
+		if [ ! "${VIDEO_GID}" == '0' ]; then
+			VIDEO_NAME=$(getent group "${VIDEO_GID}" | awk -F: '{print $1}')
+			if [ -z "${VIDEO_NAME}" ]; then
+				VIDEO_NAME="video$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c8)"
+				groupadd "$VIDEO_NAME"
+				groupmod -g "$VIDEO_GID" "$VIDEO_NAME"
+				echo "Generated a new group called: $VIDEO_NAME with id: $VIDEO_GID to match existing group on: $i"
+			fi
+			usermod -a -G "$VIDEO_NAME" www-data
+			echo "Added user www-data to group $VIDEO_NAME so that it has permission to use: $i"
+			touch /groupadd
+		fi
+	fi
+done
+
+if [ -n "${FILES}" ] && [ ! -f "/groupadd" ]; then
+	usermod -a -G root www-data
+	echo "Added user www-data to root group for lack of a better option."
+fi