Changed script to avoid slow usermod when possible.

root/etc/cont-init.d/40-plex-first-run

@@ -37,7 +37,23 @@ prefFile="${pmsApplicationSupportDir}/Plex Media Server/Preferences.xml"
 # Setup user/group ids
 if [ ! -z "${PLEX_UID}" ]; then
   if [ ! "$(id -u plex)" -eq "${PLEX_UID}" ]; then
+    
+    # usermod likes to chown the home directory, so create a new one and use that
+    # However, if the new UID is 0, we can't set the home dir back because the
+    # UID of 0 is already in use (executing this script).
+    if [ ! "${PLEX_UID}" -eq 0 ]; then
+      mkdir /tmp/temphome
+      usermod -d /tmp/temphome plex
+    fi
+    
+    # Change the UID
     usermod -o -u "${PLEX_UID}" plex
+    
+    # Cleanup the temp home dir
+    if [ ! "${PLEX_UID}" -eq 0 ]; then
+      usermod -d /config plex
+      rm -Rf /tmp/temphome
+    fi
   fi
 fi