From d2f4d076195f048146fa64916283a524f6820380 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Mon, 14 Oct 2024 13:15:55 +0200
Subject: [PATCH] Add assert

---
 src/libfetchers/tarball.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libfetchers/tarball.cc b/src/libfetchers/tarball.cc
index aa5d61bc5..28574e7b1 100644
--- a/src/libfetchers/tarball.cc
+++ b/src/libfetchers/tarball.cc
@@ -90,6 +90,7 @@ DownloadFileResult downloadFile(
     /* Cache metadata for all URLs in the redirect chain. */
     for (auto & url : res.urls) {
         key.second.insert_or_assign("url", url);
+        assert(!res.urls.empty());
         infoAttrs.insert_or_assign("url", *res.urls.rbegin());
         getCache()->upsert(key, *store, infoAttrs, *storePath);
     }