Bug fixes from last

Bail early if all files present. Essential to avoid errors about
downloads being disabled when required files are present.

Ignore errors when mirroring; logging is all we need to do.

csppfetch/__init__.py

@@ -334,6 +334,9 @@ def download_all(url_to_dst, download_stats, do_download, timeout):
         else:
             todo[src] = dst
 
+    if len(todo) == 0:
+        return
+
     if not do_download:
         raise DownloadsDisabledException(f"Some requested files are not present, and downloads were disabled. Files: {list(todo.values())}")
 
@@ -895,8 +898,11 @@ class Downloader:
         filesets = self.get_filesets_for_time(time)
         
         timeout = self.get_timeout(timeout)
-        retries = self.get_retries(retries)
         retry_wait = self.get_retry_wait(retry_wait)
+        if do_download:
+            retries = self.get_retries(retries)
+        else:
+            retries = 1
         return self.download_first_available(filesets, dst, timeout=timeout, retries=retries, retry_wait=retry_wait, do_download = do_download, download_stats = download_stats)
 
 
@@ -931,8 +937,14 @@ class Downloader:
         timeout = self.get_timeout(timeout)
 
         for filesets in filesets_list_list:
+            try:
                 self.download_first_available(filesets, dst, timeout=timeout, retries=1, retry_wait=1, download_stats = download_stats)
 
+            except:
+                # We just keep trucking on; missed files are unfortunate,
+                # but not much we can do.
+                pass
+