From b920b908578d68c7c80f1c1e89c42784693e18d5 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Mon, 18 Jun 2018 10:36:19 +0200
Subject: [PATCH] Detect redirect loops

Fixes #2225.
---
 src/libstore/download.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libstore/download.cc b/src/libstore/download.cc
index 7a5deed32..07acd5d0e 100644
--- a/src/libstore/download.cc
+++ b/src/libstore/download.cc
@@ -244,6 +244,7 @@ struct CurlDownloader : public Downloader
 
             curl_easy_setopt(req, CURLOPT_URL, request.uri.c_str());
             curl_easy_setopt(req, CURLOPT_FOLLOWLOCATION, 1L);
+            curl_easy_setopt(req, CURLOPT_MAXREDIRS, 10);
             curl_easy_setopt(req, CURLOPT_NOSIGNAL, 1);
             curl_easy_setopt(req, CURLOPT_USERAGENT,
                 ("curl/" LIBCURL_VERSION " Nix/" + nixVersion +
@@ -364,6 +365,7 @@ struct CurlDownloader : public Downloader
                         case CURLE_INTERFACE_FAILED:
                         case CURLE_UNKNOWN_OPTION:
                         case CURLE_SSL_CACERT_BADFILE:
+                        case CURLE_TOO_MANY_REDIRECTS:
                             err = Misc;
                             break;
                         default: // Shut up warnings