Add linting of PKGBUILDs

Signed-off-by: Knut Ahlers <knut@ahlers.me>

.config/sanity.d/pkgbuild-lint.sh

@@ -0,0 +1,62 @@
+function sanity_lint_pkgbuild() {
+	[[ -f PKGBUILD ]] || {
+		report debug "No PKGBUILD file found, skipping check"
+		return 0
+	}
+
+	command -v namcap 2>&1 >/dev/null || {
+		report warn "PKGBUILD found but 'namcap' utility not available"
+		return 0
+	}
+
+	local output=$(namcap -i PKGBUILD)
+	local errors=$(echo "${output}" | grep -c " E: ")
+	local warns=$(echo "${output}" | grep -c " W: ")
+
+	[ $errors -eq 0 ] || {
+		report error "'namcap PKGBUILD' found $errors errors and $warns warnings"
+		return 1
+	}
+
+	[ $warns -eq 0 ] || {
+		report warn "'namcap PKGBUILD' found $warns warnings"
+		return 0
+	}
+
+	report success "'namcap PKGBUILD' found no errors or warnings"
+}
+
+function sanity_lint_pkgbuild_result() {
+	[[ -f PKGBUILD ]] || {
+		report debug "No PKGBUILD file found, skipping check"
+		return 0
+	}
+
+	local packages=($(find . -name '*.pkg.tar.xz' -or -name '*.pkg.tar.zst'))
+	[ ${#packages[@]} -gt 0 ] || {
+		report warn "PKGBUILD but no *.pkg.tar.xz or *.pkg.tar.zst found, skipping check"
+		return 0
+	}
+
+	local retcode=0
+	local nosuccess=0
+	for pkg in "${packages[@]}"; do
+		local output=$(namcap -i "${pkg}")
+		local errors=$(echo "${output}" | grep -c " E: ")
+		local warns=$(echo "${output}" | grep -c " W: ")
+
+		[ $errors -eq 0 ] || {
+			report error "'namcap ${pkg}' found $errors errors and $warns warnings"
+			nosuccess=1
+			retcode=1
+		}
+
+		[ $warns -eq 0 ] || {
+			report warn "'namcap ${pkg}' found $warns warnings"
+			nosuccess=1
+		}
+	done
+
+	[ $nosuccess -eq 1 ] || report success "No errors or warnings found in built packages"
+	return $retcode
+}