new checks

check_nodejs_freshness

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+node_homepage="http://nodejs.org/download/"
+node_bin="node"
+
+[ -n "$1" ] && node_bin="$1"
+
+error=""
+
+local_version="$($node_bin -v 2>/dev/null)"
+remote_version="$(wget -q -O - -- $node_homepage | grep 'Current version:' | sed -e 's/<[a-zA-Z\/][^>]*>//g' | sed 's/^ *//g' | sed 's/ $//g' | awk '{ print $3 }')"
+
+if [ -z "$local_version" ]; then
+  error="could not determine local node.js version"
+  errcode=1
+elif [ -z "$remote_version" ]; then
+  error="could not determine remote node.js version"
+  errcode=1
+else
+  if [ "$local_version" != "$remote_version" ]; then
+    error="local node.js version is not up to date ($local_version vs. $remote_version)"
+    errcode=2
+  fi
+fi
+
+if [ "$error" != "" ]; then
+  echo -e "ERROR: $error"
+  exit $errcode
+else
+  echo "OK: local node.js version is up to date"
+  exit 0
+fi