Rename PIP_{REQ -> BUILD}_TRACKER

Author: pradyunsg

src/pip/_internal/req/req_tracker.py

@@ -40,11 +40,11 @@ def update_env_context_manager(**changes: str) -> Iterator[None]:
 
 @contextlib.contextmanager
 def get_build_tracker() -> Iterator["BuildTracker"]:
-    root = os.environ.get("PIP_REQ_TRACKER")
+    root = os.environ.get("PIP_BUILD_TRACKER")
     with contextlib.ExitStack() as ctx:
         if root is None:
-            root = ctx.enter_context(TempDirectory(kind="req-tracker")).path
-            ctx.enter_context(update_env_context_manager(PIP_REQ_TRACKER=root))
+            root = ctx.enter_context(TempDirectory(kind="build-tracker")).path
+            ctx.enter_context(update_env_context_manager(PIP_BUILD_TRACKER=root))
             logger.debug("Initialized build tracking at %s", root)
 
         with BuildTracker(root) as tracker:

tests/conftest.py

@@ -271,7 +271,7 @@ def isolate(tmpdir: Path, monkeypatch: pytest.MonkeyPatch) -> None:
     monkeypatch.setenv("PIP_DISABLE_PIP_VERSION_CHECK", "true")
 
     # Make sure tests don't share a requirements tracker.
-    monkeypatch.delenv("PIP_REQ_TRACKER", False)
+    monkeypatch.delenv("PIP_BUILD_TRACKER", False)
 
     # FIXME: Windows...
     os.makedirs(os.path.join(home_dir, ".config", "git"))