add extendable script to test hyrule's critical systemd services

scripts/testvps

@@ -0,0 +1,82 @@
+#!/usr/bin/env bash
+# Requires: systemctl
+
+set -u
+
+function match {
+  [[ "$1" =~ $2 ]]
+}
+
+function padlen {
+  local MAX=0
+  for KEY in "$@"; do
+    local LEN=${#KEY}
+    ((LEN > MAX)) && MAX=$LEN
+  done
+  echo $MAX
+}
+
+function pad {
+  local PAD="$1"
+  if [ -z "$PAD" ]; then
+    exit 1
+  fi
+  
+  for ((i=0; i<PAD; i++)); do
+    printf " "
+  done
+}
+
+function fmt_print {
+  set +u
+  local SERVICE=$1
+  local LPAD=$2
+  local ACTIVE=$3
+  local ENABLED=$4
+
+  if [ "$ACTIVE" = "NOTFOUND" ]; then
+    ACTIVE="\e[1m\e[31m$ACTIVE\e[0m"
+  elif [ "$ACTIVE" = "inactive" ]; then
+    ACTIVE="\e[1m\e[31m$ACTIVE\e[0m"
+  else
+    ACTIVE="\e[32m$ACTIVE\e[0m"
+  fi
+
+  if [ "$ENABLED" = "enabled" ]; then
+    ENABLED="[\e[32m$ENABLED\e[0m]"
+  elif [ "$ENABLED" = "disabled" ]; then
+    ENABLED="[\e[1m\e[33m$ENABLED\e[0m]"
+  fi
+  set -u
+  echo -e "\e[35m[*]\e[0m $SERVICE:$LPAD $ACTIVE $ENABLED"
+}
+
+function fmt_test_service (
+  local SERVICE=$1
+  local LPAD_SZ=$2 # service name lpad size
+  local LPAD=$(pad $LPAD_SZ)
+
+  local EXISTS=0
+  local STAT=$(systemctl status "$SERVICE" 2>/dev/null)
+  if [ -z "$STAT" ]; then
+    fmt_print "$SERVICE" "$LPAD" "NOTFOUND"
+    exit 1
+  fi
+
+  local STAT_LOADED=$(head -n2 <<< "$STAT" | tail -n1)
+  # NOTE: "active  " intentionally contains right padding
+  local ENABLED=$(match "$STAT_LOADED" "^\s*Loaded: loaded \(.*; enabled; .*\)" && echo "enabled" || echo "disabled")
+  local ACTIVE=$(match "$STAT" "\s*Active: active \(running\)" && echo "active  " || echo "inactive")
+  fmt_print "$SERVICE" "$LPAD" "$ACTIVE" "$ENABLED"
+)
+
+function test_services {
+  local PAD_ALIGN=$(padlen $@)
+  # fmt_test_service
+  for SERVICE in "$@"; do
+    local LPAD=$((PAD_ALIGN - ${#SERVICE}))
+    fmt_test_service "$SERVICE" $LPAD
+  done
+}
+
+test_services nginx forgejo vaultwarden