X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=file.go;h=c7e580990d7ba54ada969e6d454acecc54c07704;hb=1002c514a8530bb6608c556b4446e853be390917;hp=e06a9bce335ccc4e4444e5f8ea9502d27df09eba;hpb=44a325a9bea5f53c6489cecb3691709306a1814c;p=nsscash%2Fnsscash.git

diff --git a/file.go b/file.go
index e06a9bc..c7e5809 100644
--- a/file.go
+++ b/file.go
@@ -1,6 +1,6 @@
 // Download and write files atomically to the file system
 
-// Copyright (C) 2019  Simon Ruderich
+// Copyright (C) 2019-2020  Simon Ruderich
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU Affero General Public License as published by
@@ -89,12 +89,17 @@ func fetchFile(file *File, state *State) error {
 		t = zero // force download
 	}
 
+	oldT := t
 	status, body, err := fetchIfModified(file.Url,
 		file.Username, file.Password, file.CA, &t)
 	if err != nil {
 		return err
 	}
 	if status == http.StatusNotModified {
+		if oldT.IsZero() {
+			return fmt.Errorf("status code 304 " +
+				"but did not send If-Modified-Since")
+		}
 		log.Printf("%q -> %q: not modified", file.Url, file.Path)
 		return nil
 	}