expose this new caching with --use-feature=metadata-cache

pypa · Sep 3, 2023 · 5463825 · 5463825
1 parent 4b9c97f
commit 5463825
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diff --git a/news/12256.feature.rst b/news/12256.feature.rst
@@ -0,0 +1 @@
+Introduce ``--use-feature=metadata-cache`` to cache metadata lookups in ``~/.cache/pip/link-metadata``.
diff --git a/src/pip/_internal/cli/cmdoptions.py b/src/pip/_internal/cli/cmdoptions.py
@@ -1009,6 +1009,7 @@ def check_list_path_option(options: Values) -> None:
     choices=[
         "fast-deps",
         "truststore",
+        "metadata-cache",
     ]
     + ALWAYS_ENABLED_FEATURES,
     help="Enable new functionality, that may be backward incompatible.",

diff --git a/src/pip/_internal/cli/req_command.py b/src/pip/_internal/cli/req_command.py
@@ -308,7 +308,7 @@ def make_requirement_preparer(
                     "fast-deps has no effect when used with the legacy resolver."
                 )
 
-        if options.cache_dir:
+        if bool(options.cache_dir) and ("metadata-cache" in options.features_enabled):
             metadata_cache = LinkMetadataCache(options.cache_dir)
         else:
             metadata_cache = None