Improve recursive object restore

When restoring a complete bucket stop and raise an error only when
the configuration is set to stop on the first error.
otherwise keep trying to restore the next objects.

Ignore the following errors:
- When the object is currently in transition
- When the object is not concerned by the restore request
  (already in standard storage-class etc)

closes #1369

Signed-off-by: Alexandre Lavigne <lavigne958@gmail.com>

Author: lavigne958

s3cmd

@@ -923,6 +923,8 @@ def cmd_object_restore(args):
         warning(u"Exiting now because of --dry-run")
         return EX_OK
 
+    ret = EX_OK
+
     for key in remote_list:
         item = remote_list[key]
 
@@ -932,13 +934,17 @@ def cmd_object_restore(args):
                 response = s3.object_restore(S3Uri(item['object_uri_str']))
                 output(u"restore: '%s'" % item['object_uri_str'])
             except S3Error as e:
-                if e.code == "RestoreAlreadyInProgress":
+                if e.code in ("RestoreAlreadyInProgress", "InvalidObjectState"):
                     warning("%s: %s" % (e.message, item['object_uri_str']))
-                else:
+                elif cfg.stop_on_error:
                     raise e
+                else:
+                    error("restore failed for: '%s' (%s)", item['object_uri_str'], e)
+                    ret = EX_PARTIAL
+
         else:
             debug(u"Skipping directory since only files may be restored")
-    return EX_OK
+    return ret
 
 
 def subcmd_cp_mv(args, process_fce, action_str, message):