check_links.sh

#!/usr/bin/env bash
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target=${1:-"http://localhost:4000"}

# Crawl the docs, ignoring robots.txt, storing nothing locally
wget --spider -r -nd -nv -e robots=off -p -o spider.log "$target"

# Abort for anything other than 0 and 4 ("Network failure")
status=$?
if [ $status -ne 0 ] && [ $status -ne 4 ]; then
    exit $status
fi

# Fail the build if any broken links are found
broken_links_str=$(grep -e 'Found [[:digit:]]\+ broken links' spider.log)
if [ -n "$broken_links_str" ]; then
    echo -e "\e[1;31m$broken_links_str\e[0m"
    exit 1
fi