docker-plex/root/etc/cont-init.d/50-chown-files

#!/usr/bin/with-contenv bash

# check for preferences file and exit out if not found
[[ ! -e "/config/Library/Application Support/Plex Media Server/Preferences.xml" ]] && \
	exit 0

if [ ! -f "/config/Library/linuxserver-chown.lock" ]; then
  find /config/Library ! \( -user abc -a -group abc \) -print0 | xargs -0 chown abc:abc
  touch /config/Library/linuxserver-chown.lock
  chown abc:abc /config/Library/linuxserver-chown.lock
fi