Add noexec /tmp detection — fall back to /usr/local/src for staging

Scripts auto-detect noexec /tmp by attempting to execute a test script.
If /tmp is noexec, staging directory falls back to /usr/local/src.
Supports mixed fleets with both noexec and standard /tmp mounts.

Updated: deploy-exporter (1.1), install-node-exporter (1.2),
install-prometheus-stack (3.2), update-prometheus-stack (1.02),
install-snort (1.02), install-ntfy-server (1.1), install-bot-monitor (1.2)

deploy-exporter.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 ################################################################################
 # Script Name: deploy-exporter.sh
-# Version: 1.0
+# Version: 1.1
 # Description: Deployment tool for Prometheus exporters from mylinux.work.
 #              Downloads, installs, configures cron jobs, validates output,
 #              and manages lifecycle (install, update, remove, status) for
@@ -38,6 +38,18 @@ INSTALL_DIR="/usr/local/bin"
 CRON_DIR="/etc/cron.d"
 TEXTFILE_DIR="/var/lib/node_exporter"
 
+# Detect noexec /tmp — fall back to /usr/local/src for staging
+STAGE_DIR="/tmp"
+_exec_test=$(mktemp /tmp/.exec_test.XXXXXX 2>/dev/null)
+if [[ -n "$_exec_test" ]]; then
+    printf '#!/bin/sh\nexit 0\n' > "$_exec_test"
+    chmod +x "$_exec_test"
+    "$_exec_test" 2>/dev/null || STAGE_DIR="/usr/local/src"
+    rm -f "$_exec_test"
+else
+    STAGE_DIR="/usr/local/src"
+fi
+
 # ============================================================================
 # AVAILABLE EXPORTERS
 # ============================================================================
@@ -328,7 +340,7 @@ install_one() {
 
     log "Installing ${name}..."
 
-    temp_file=$(mktemp "/tmp/${name}.XXXXXX")
+    temp_file=$(mktemp "${STAGE_DIR}/${name}.XXXXXX")
     if ! download "$url" "$temp_file"; then
         rm -f "$temp_file"
         err "Failed to download ${url}"
@@ -503,7 +515,7 @@ cmd_update() {
 
         local url="${BASE_URL}/${name}.sh"
         local temp_file
-        temp_file=$(mktemp "/tmp/${name}.XXXXXX")
+        temp_file=$(mktemp "${STAGE_DIR}/${name}.XXXXXX")
 
         if ! download "$url" "$temp_file"; then
             rm -f "$temp_file"