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-prometheus-stack.sh

@@ -9,7 +9,7 @@ set -euo pipefail
 #### Author: Phil Connor                                 ####
 #### Contact: contact@mylinux.work                       ####
 #### License: MIT                                        ####
-#### Version: 3.1                                        ####
+#### Version: 3.2                                        ####
 ####                                                     ####
 #### Usage: ./install-prometheus-stack.sh [OPTIONS]       ####
 #############################################################
@@ -105,9 +105,21 @@ CONFIG FILE FORMAT:
 EOF
 }
 
+# Detect noexec /tmp — fall back to /usr/local/src
+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
+
 cleanup() {
-    if [[ -d "/tmp/prometheus-install-$$" ]]; then
-        rm -rf "/tmp/prometheus-install-$$"
+    if [[ -d "${STAGE_DIR}/prometheus-install-$$" ]]; then
+        rm -rf "${STAGE_DIR}/prometheus-install-$$"
     fi
 }
 
@@ -262,7 +274,7 @@ install_prometheus() {
         return
     fi
     
-    local workdir="/tmp/prometheus-install-$$/prometheus"
+    local workdir="${STAGE_DIR}/prometheus-install-$$/prometheus"
     mkdir -p "$workdir"
     cd "$workdir"
     
@@ -417,7 +429,7 @@ install_node_exporter() {
         return
     fi
     
-    local workdir="/tmp/prometheus-install-$$/node_exporter"
+    local workdir="${STAGE_DIR}/prometheus-install-$$/node_exporter"
     mkdir -p "$workdir"
     cd "$workdir"
     
@@ -494,7 +506,7 @@ install_blackbox() {
         return
     fi
     
-    local workdir="/tmp/prometheus-install-$$/blackbox"
+    local workdir="${STAGE_DIR}/prometheus-install-$$/blackbox"
     mkdir -p "$workdir"
     cd "$workdir"
     
@@ -686,7 +698,7 @@ install_loki() {
         return
     fi
     
-    local workdir="/tmp/prometheus-install-$$/loki"
+    local workdir="${STAGE_DIR}/prometheus-install-$$/loki"
     mkdir -p "$workdir"
     cd "$workdir"
     
@@ -830,7 +842,7 @@ install_alloy() {
         return
     fi
     
-    local workdir="/tmp/prometheus-install-$$/alloy"
+    local workdir="${STAGE_DIR}/prometheus-install-$$/alloy"
     mkdir -p "$workdir"
     cd "$workdir"
     
@@ -1243,7 +1255,7 @@ install_alertmanager() {
         return
     fi
     
-    local workdir="/tmp/prometheus-install-$$/alertmanager"
+    local workdir="${STAGE_DIR}/prometheus-install-$$/alertmanager"
     mkdir -p "$workdir"
     cd "$workdir"
     
@@ -1337,7 +1349,7 @@ install_mysql_exporter() {
         return
     fi
     
-    local workdir="/tmp/prometheus-install-$$/mysql_exporter"
+    local workdir="${STAGE_DIR}/prometheus-install-$$/mysql_exporter"
     mkdir -p "$workdir"
     cd "$workdir"