check-phpwebapp-update.sh

#!/bin/bash

if [ "$#" -ne 4 ]; then
    echo "Usage: $0 Name URL pattern version" >&2
    exit 1
fi

software=$1
url=$2
pattern=$3
version=$4

page=$(curl "$url" 2>/dev/null)
if [[ $? -ne 0 ]]; then
	echo "Querying ${url} (for ${software}) failed."
	exit 1
fi
match=$(echo $page | grep -Po "${pattern}")
if [[ $? -ne 0 ]]; then
	echo "Version pattern '${pattern}' not found in ${url} (for ${software})."
	exit 1
fi
echo $match | grep -qF $version
if [[ $? -ne 0 ]]; then
	echo "${software} requires update: \"${version}\" does not match \"${match}\"."
	exit 0
fi
exit 0