Add a flag to not enable origins listed by a lister

This cuts down one more manual step in the add forge now validation
process: we can add the relevant origins to the staging scheduler
without enabling them at all.

swh/lister/pattern.py

@@ -10,6 +10,7 @@ import logging
 from typing import Any, Dict, Generic, Iterable, Iterator, List, Optional, Set, TypeVar
 from urllib.parse import urlparse
 
+import attr
 import requests
 from tenacity.before_sleep import before_sleep_log
 
@@ -86,6 +87,7 @@ class Lister(Generic[StateType, PageType]):
         expected credentials for the given instance of that lister.
       max_pages: the maximum number of pages listed in a full listing operation
       max_origins_per_page: the maximum number of origins processed per page
+      enable_origins: whether the created origins should be enabled or not
 
     Generic types:
       - *StateType*: concrete lister type; should usually be a :class:`dataclass` for
@@ -106,6 +108,7 @@ class Lister(Generic[StateType, PageType]):
         credentials: CredentialsType = None,
         max_origins_per_page: Optional[int] = None,
         max_pages: Optional[int] = None,
+        enable_origins: bool = True,
         with_github_session: bool = False,
     ):
         if not self.LISTER_NAME:
@@ -146,6 +149,7 @@ class Lister(Generic[StateType, PageType]):
         self.recorded_origins: Set[str] = set()
         self.max_pages = max_pages
         self.max_origins_per_page = max_origins_per_page
+        self.enable_origins = enable_origins
 
     @http_retry(before_sleep=before_sleep_log(logger, logging.WARNING))
     def http_request(self, url: str, method="GET", **kwargs) -> requests.Response:
@@ -189,6 +193,11 @@ class Lister(Generic[StateType, PageType]):
                         self.max_origins_per_page,
                     )
                     origins = origins[: self.max_origins_per_page]
+                if not self.enable_origins:
+                    logger.info(
+                        "Disabling origins before sending them to the scheduler"
+                    )
+                    origins = [attr.evolve(origin, enabled=False) for origin in origins]
                 sent_origins = self.send_origins(origins)
                 self.recorded_origins.update(sent_origins)
                 full_stats.origins = len(self.recorded_origins)