mass_copy_between_backends: Also catch unexpected exceptions, and simply move on to the next file.

pillar/cli.py

@@ -423,6 +423,7 @@ def mass_copy_between_backends(src_backend='cdnsun', dest_backend='gcs'):
                             projection={'_id': True})
     copied_ok = 0
     copy_errs = 0
+    try:
         for fdoc in fdocs:
             try:
                 moving.change_file_storage_backend(fdoc['_id'], dest_backend)
@@ -433,8 +434,13 @@ def mass_copy_between_backends(src_backend='cdnsun', dest_backend='gcs'):
                 log.error('Error copying %s (%s): %s',
                           fdoc['_id'], ex.response.url, ex)
                 copy_errs += 1
+            except Exception:
+                log.exception('Unexpected exception handling file %s', fdoc['_id'])
+                copy_errs += 1
             else:
                 copied_ok += 1
+    except KeyboardInterrupt:
+        log.error('Stopping due to keyboard interrupt')
 
     log.info('%i files copied ok', copied_ok)
     log.info('%i files we did not copy', copy_errs)