Update copyright years

[nsscash/nsscash.git] / file.go

diff --git a/file.go b/file.go
index e06a9bce335ccc4e4444e5f8ea9502d27df09eba..c7e580990d7ba54ada969e6d454acecc54c07704 100644 (file)
--- 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
        }