Wiki.js: only back up db.sqlite on SQLite installs (#17993)

Installs since February 2025 use PostgreSQL and have no db.sqlite, so the update stopped at the backup (#17971). mkdir -p lets a rerun get past the backup folder a failed run left behind.

ct/wikijs.sh

@@ -33,22 +33,18 @@ function update_script() {
   NODE_VERSION="26" NODE_MODULE="yarn,node-gyp" setup_nodejs
 
   if check_for_gh_release "wikijs" "requarks/wiki-v2"; then
-    #msg_info "Verifying whether ${APP}' new release is v3.x+ and current install uses SQLite."
-    #SQLITE_INSTALL=$([ -f /opt/wikijs/db.sqlite ] && echo "true" || echo "false")
-    #if [[ "${SQLITE_INSTALL}" == "true" && "${CHECK_UPDATE_RELEASE}" =~ ^3.* ]]; then
-    #  echo "SQLite is not supported in v3.x+, currently there is no update path availble."
-    #  exit
-    #fi
-    #msg_ok "There is an update path available for ${APP}"
+    # Installs before February 2025 use SQLite, newer ones PostgreSQL
+    SQLITE_INSTALL=$([[ -f /opt/wikijs/db.sqlite ]] && echo "true" || echo "false")
 
     msg_info "Stopping Service"
     systemctl stop wikijs
     msg_ok "Stopped Service"
 
     msg_info "Backing up Data"
-    mkdir /opt/wikijs-backup
-    #$SQLITE_INSTALL && 
-    cp /opt/wikijs/db.sqlite /opt/wikijs-backup
+    mkdir -p /opt/wikijs-backup
+    if [[ "$SQLITE_INSTALL" == "true" ]]; then
+      cp /opt/wikijs/db.sqlite /opt/wikijs-backup
+    fi
     cp -R /opt/wikijs/{config.yml,/data} /opt/wikijs-backup
     msg_ok "Backed up Data"
 
@@ -56,8 +52,9 @@ function update_script() {
 
     msg_info "Restoring Data"
     cp -R /opt/wikijs-backup/* /opt/wikijs
-    #$SQLITE_INSTALL && 
-    $STD npm rebuild sqlite3
+    if [[ "$SQLITE_INSTALL" == "true" ]]; then
+      $STD npm rebuild sqlite3
+    fi
     rm -rf /opt/wikijs-backup
     msg_ok "Restored Data"