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)

install-node-exporter.sh

@@ -9,7 +9,7 @@ set -euo pipefail
 #### Author: Phil Connor                                 ####
 #### Contact: contact@mylinux.work                       ####
 #### License: MIT                                        ####
-#### Version: 1.1                                        ####
+#### Version: 1.2                                        ####
 ####                                                     ####
 #### Usage: ./install-node-exporter.sh [OPTIONS]         ####
 #############################################################
@@ -208,7 +208,20 @@ create_service_user() {
 download_and_install() {
     local version="$1"
 
-    TMPDIR=$(mktemp -d /tmp/node-exporter-install-XXXXXX)
+    # Detect noexec /tmp — fall back to /usr/local/src
+    local stage_dir="/tmp"
+    local _exec_test
+    _exec_test=$(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 "$_exec_test"
+    else
+        stage_dir="/usr/local/src"
+    fi
+
+    TMPDIR=$(mktemp -d "${stage_dir}/node-exporter-install-XXXXXX")
     local tarball="node_exporter-${version}.linux-${ARCH}.tar.gz"
     local url="https://github.com/prometheus/node_exporter/releases/download/v${version}/${tarball}"