Commits to communicate

Author: pradyunsg

src/pip/_internal/operations/prepare.py

@@ -449,7 +449,7 @@ def _get_linked_req_hashes(self, req):
         # showing the user what the hash should be.
         return req.hashes(trust_internet=False) or MissingHashes()
 
-    def prepare_linked_requirement(self, req, parallel_builds=False):
+    def download_linked_requirement(self, req, parallel_builds=False):
         # type: (InstallRequirement, bool) -> AbstractDistribution
         """Prepare a requirement to be obtained from req.link."""
         assert req.link

src/pip/_internal/resolution/legacy/resolver.py

@@ -337,7 +337,7 @@ def _get_abstract_dist_for(self, req):
 
         # We eagerly populate the link, since that's our "legacy" behavior.
         self._populate_link(req)
-        abstract_dist = self.preparer.prepare_linked_requirement(req)
+        abstract_dist = self.preparer.download_linked_requirement(req)
 
         # NOTE
         # The following portion is for determining if a certain package is

src/pip/_internal/resolution/resolvelib/candidates.py

@@ -199,9 +199,6 @@ def _prepare_abstract_distribution(self):
 
     def _prepare(self):
         # type: () -> None
-        if self._dist is not None:
-            return
-
         try:
             abstract_dist = self._prepare_abstract_distribution()
         except HashError as e:
@@ -224,10 +221,19 @@ def _prepare(self):
                 self._ireq, "version", self._dist.version,
             )
 
+    def _fetch_metadata(self):
+        # logic for downloads
+        if not partial_downloads:
+            self._prepare()
+            return
+
+        # populate self._dist with partial downloads
+
     @property
     def dist(self):
         # type: () -> Distribution
-        self._prepare()
+        if self._dist is not None:
+            self._fetch_metadata()
         return self._dist
 
     def _get_requires_python_specifier(self):
@@ -295,7 +301,7 @@ def __init__(
 
     def _prepare_abstract_distribution(self):
         # type: () -> AbstractDistribution
-        return self._factory.preparer.prepare_linked_requirement(
+        return self._factory.preparer.download_linked_requirement(
             self._ireq, parallel_builds=True,
         )