Check RSS fix

bin/check-rss-template

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
+tmp_dir=$(mktemp -d)
+trap 'rm -rf "${tmp_dir}"' EXIT
+
+hugo_version="${HUGO_VERSION:?HUGO_VERSION must be set}"
+upstream_template="${tmp_dir}/rss.xml"
+diff_output="${tmp_dir}/rss.diff"
+
+curl -fsSL "https://raw.githubusercontent.com/gohugoio/hugo/refs/tags/v${hugo_version}/tpl/tplimpl/embedded/templates/rss.xml" \
+	-o "${upstream_template}"
+
+set +e
+diff "${upstream_template}" "${repo_root}/themes/v2/layouts/_default/rss.xml" >"${diff_output}"
+diff_status=$?
+set -e
+
+if [[ "${diff_status}" -gt 1 ]]; then
+	exit "${diff_status}"
+fi
+
+line_count=$(wc -l <"${diff_output}" | tr -d ' ')
+if [[ "${line_count}" != "7" ]]; then
+	echo "Unexpected RSS template diff line count: ${line_count}" >&2
+	cat "${diff_output}" >&2
+	exit 1
+fi