If fallback is enabled, temporarily disable substituters after a failure

Otherwise, we just keep asking the substituter for other .narinfo
files, which can take a very long time due to retries/timeouts.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 96ca2874257c..1402bd097c35 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -3682,6 +3682,12 @@ void SubstitutionGoal::tryNext()
     } catch (InvalidPath &) {
         tryNext();
         return;
+    } catch (SubstituterDisabled &) {
+        if (settings.tryFallback) {
+            tryNext();
+            return;
+        }
+        throw;
     } catch (Error & e) {
         if (settings.tryFallback) {
             printError(e.what());