build.func: fix OS mismatch message when script target moved to an older OS

CHANGELOG.md

@@ -510,12 +510,6 @@ Exercise vigilance regarding copycat or coat-tailing sites that seek to exploit
 
 ## 2026-07-26
 
-### 🚀 Updated Scripts
-
-  - #### 🐞 Bug Fixes
-
-    - [endurain] add node update to update script [@johanngrobe](https://github.com/johanngrobe) ([#16014](https://github.com/community-scripts/ProxmoxVE/pull/16014))
-
 ## 2026-07-25
 
 ### 🚀 Updated Scripts

ct/endurain.sh

@@ -34,8 +34,6 @@ function update_script() {
     systemctl stop endurain
     msg_ok "Stopped Service"
 
-    NODE_VERSION="24" setup_nodejs
-
     create_backup /opt/endurain/.env /opt/endurain/frontend/dist/env.js
     CLEAN_INSTALL=1 fetch_and_deploy_codeberg_release "endurain" "endurain-project/endurain" "tarball" "latest" "/opt/endurain"
 

misc/build.func

@@ -3858,6 +3858,13 @@ check_container_os_guard() {
     return 0
   fi
 
+  local downgraded_target=0
+  if [[ "$cur_os" == "$rec_os" ]] && [[ "$cur_ver" != "$rec_ver" ]]; then
+    if [[ "$(printf '%s\n%s\n' "$cur_ver" "$rec_ver" | sort -V | tail -n1)" == "$cur_ver" ]]; then
+      downgraded_target=1
+    fi
+  fi
+
   case "${var_ignore_os_mismatch:-}" in
   1 | yes | true | on)
     msg_warn "Container OS is ${cur_os} ${cur_ver} but the script recommends ${rec_os} ${rec_ver} — continuing via var_ignore_os_mismatch (may break, no support)."
@@ -3873,10 +3880,19 @@ check_container_os_guard() {
     return 0
   fi
 
+  local mismatch_detail remediation
+  if [[ "$downgraded_target" -eq 1 ]]; then
+    mismatch_detail="Your container runs ${cur_os} ${cur_ver}, which is newer than what this script now targets (${rec_os} ${rec_ver}).\n\nThe target was likely lowered on purpose, e.g. because ${APP:-the app} had problems on newer OS versions - check the GitHub issues for ${APP:-this app} for details.\n\nContinuing on ${cur_ver} often still works, but isn't guaranteed. If you are unsure, ask in our Discord (https://discord.gg/3AnUqsXnmK) before continuing."
+    remediation="This script now targets the older ${rec_os} ${rec_ver}. Check the GitHub issues for ${APP:-this app}, or ask in Discord (https://discord.gg/3AnUqsXnmK) if you are unsure"
+  else
+    mismatch_detail="This container runs ${cur_os} ${cur_ver}, but this script now targets ${rec_os} ${rec_ver}.\n\nUpdating on the older base OS may fail or leave ${APP:-the application} broken (e.g. required runtime versions are not available).\n\nRecommended: upgrade the container OS to ${rec_os} ${rec_ver} first, then run this update again."
+    remediation="Upgrade the container OS to ${rec_os} ${rec_ver} first, then run this update again"
+  fi
+
   if [[ "${PHS_SILENT:-0}" != "1" ]] && command -v whiptail &>/dev/null && [ -t 0 ] && [[ "$TERM" != "dumb" ]]; then
     local choice
     choice=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "OS VERSION MISMATCH" --menu \
-      "This container runs ${cur_os} ${cur_ver}, but this script now targets ${rec_os} ${rec_ver}.\n\nUpdating on the older base OS may fail or leave ${APP:-the application} broken (e.g. required runtime versions are not available).\n\nRecommended: upgrade the container OS to ${rec_os} ${rec_ver} first, then run this update again.\n\nIf you continue anyway, it may break — no support is provided in that case.\n\nContinue anyway?" \
+      "${mismatch_detail}\n\nIf you continue anyway, it may break — no support is provided in that case.\n\nContinue anyway?" \
       20 70 3 \
       "1" "No  (cancel update)" \
       "2" "Yes (continue this time)" \
@@ -3899,7 +3915,7 @@ check_container_os_guard() {
   fi
 
   msg_error "Container OS ${cur_os} ${cur_ver} does not match the recommended ${rec_os} ${rec_ver} — skipping update."
-  msg_error "Upgrade the container OS to ${rec_os} ${rec_ver} first, then run this update again — or bypass this check (may break, no support) with: echo \"${rec_os} ${rec_ver}\" > ${ignore_file}"
+  msg_error "${remediation} — or bypass this check (may break, no support) with: echo \"${rec_os} ${rec_ver}\" > ${ignore_file}"
   return 1
 }