initial commit; add check_remote_wp_latest and README

README

+# monitoring plugins -- README
+
+## what's this?
+
+some monitoring plugins which i've needed, and thought i'd share with all of
+you. a lot of them exist in a similar form, but were either too complicated or
+not quite what i needed, so i rolled my own.
+
+
+### check_remote_wp_latest
+
+checks remote wordpress installations for being the latest version against
+https://api.wordpress.org/core/version-check/1.2/?version= and reports states
+fitting for $monitoring-system. works remotely, and doesn't require php on the
+monitoring server.

plugins/check_remote_wp_latest

+#!/bin/sh
+
+set -eu
+
+
+WP_UPDATE_API="http://api.wordpress.org/core/version-check/1.2/?version="
+
+
+OK=0
+WARNING=1
+CRITICAL=2
+UNKNOWN=3
+
+
+cur_vers=$(curl -s "$1" | grep -E '^<meta name="generator" content="WordPress ' | grep -Eo '([0-9.]+)')
+latest_vers=$(curl -s "${WP_UPDATE_API}${cur_vers}" | tr '\n' ' ' | cut -d ' ' -f 4)
+
+if [ "$cur_vers" = "$latest_vers" ]; then
+    echo "OK: has latest version ($latest_vers)"
+    exit $OK
+else
+    echo "CRITICAL: has $cur_vers, but latest is $latest_vers"
+    exit $CRITICAL
+fi