Improve Plex data location migration

plex/rootfs/etc/cont-init.d/90-create_links.sh

@@ -4,25 +4,49 @@
 # SYMLINK CONFIG #
 ##################
 
-if [ ! -d /share/plex ]; then
-    echo "Creating /share/plex"
-    mkdir -p /share/plex
+DATA_LOCATION="$(bashio::config 'data_location')"
+OLD_LOCATION=""
+
+if [ -L /config/Library ]; then
+    old_library_path="$(readlink -f /config/Library)"
+    if [ -n "$old_library_path" ]; then
+        OLD_LOCATION="$(dirname "$old_library_path")"
+    fi
 fi
 
-if [ ! -d /share/plex/Library ]; then
+if [ -z "$OLD_LOCATION" ] && [ -d "/share/plex" ]; then
+    OLD_LOCATION="/share/plex"
+fi
+
+if [ -n "$OLD_LOCATION" ] && [ "$DATA_LOCATION" != "$OLD_LOCATION" ] && [ -d "$OLD_LOCATION" ]; then
+    if [ -d "${DATA_LOCATION}" ] && [ "$(ls -A "${DATA_LOCATION}" 2>/dev/null)" ]; then
+        echo "Skipping migration: ${DATA_LOCATION} already contains data"
+    else
+        echo "Migrating existing ${OLD_LOCATION} data to ${DATA_LOCATION}"
+        mkdir -p "${DATA_LOCATION}"
+        cp -a "${OLD_LOCATION}/." "${DATA_LOCATION}/" || true
+    fi
+fi
+
+if [ ! -d "${DATA_LOCATION}" ]; then
+    echo "Creating ${DATA_LOCATION}"
+    mkdir -p "${DATA_LOCATION}"
+fi
+
+if [ ! -d "${DATA_LOCATION}/Library" ]; then
     echo "moving Library folder"
-    mv /config/Library /share/plex
-    ln -s /share/plex/Library /config
+    mv /config/Library "${DATA_LOCATION}"
+    ln -s "${DATA_LOCATION}/Library" /config
     echo "links done"
 else
     rm -r /config/Library
-    ln -s /share/plex/Library /config
+    ln -s "${DATA_LOCATION}/Library" /config
     echo "Using existing config"
 fi
 
 # Adapt permissions if needed
 if ! bashio::config.true "skip_permissions_check" && [ "${PUID:-0}" != "0" ] && [ "${PGID:-0}" != "0" ]; then
     bashio::log.info "Updating permissions"
-    chown -R "$PUID:$PGID" /share/plex
-    chmod -R 777 /share/plex
+    chown -R "$PUID:$PGID" "${DATA_LOCATION}"
+    chmod -R 777 "${DATA_LOCATION}"
 fi