fix: _has_valid_outer_pip when pip is missing (#1003)

notatallshaw · web-flow · commit b9457525a02b · 2026-03-24T23:09:22.000-04:00
diff --git a/docs/changelog/1003.fix.rst b/docs/changelog/1003.fix.rst
@@ -0,0 +1,2 @@
+Fix ``_has_valid_outer_pip`` returning ``True`` when pip is missing, causing build to try using a non-existent pip
+instead of falling back to virtualenv.
diff --git a/src/build/env.py b/src/build/env.py
@@ -188,7 +188,7 @@ def _has_valid_outer_pip(self) -> bool | None:
                         return True
             return False
 
-        return True
+        return None  # pragma: no cover
 
     @functools.cached_property
     def _has_virtualenv(self) -> bool:

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Fix ``_has_valid_outer_pip`` returning ``True`` when pip is missing, causing build to try using a non-existent pip
	`2`	`+instead of falling back to virtualenv.`