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e37479ca70
Backport a fix to my unvendored pip support patch that fixes a crash when dev-python/pip is not installed at all. Signed-off-by: Michał Górny <mgorny@gentoo.org>
36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
diff --git a/src/build/env.py b/src/build/env.py
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index e583e68..ae5177b 100644
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--- a/src/build/env.py
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+++ b/src/build/env.py
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@@ -11,6 +11,7 @@ import sys
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import sysconfig
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import tempfile
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import typing
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+import warnings
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from collections.abc import Collection, Mapping
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@@ -158,8 +159,21 @@ class _PipBackend(_EnvBackend):
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This checks for a valid global pip. Returns None if pip is missing, False
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if pip is too old, and True if it can be used.
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"""
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+
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# Version to have added the `--python` option.
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- return _has_dependency('pip', '22.3')
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+ if not _has_dependency('pip', '22.3'): # pragma: no cover
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+ return False
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+
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+ # `pip install --python` is nonfunctional on Gentoo debundled pip.
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+ # Detect that by checking if pip._vendor` module exists. However,
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+ # searching for pip could yield warnings from _distutils_hack,
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+ # so silence them.
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+ with warnings.catch_warnings():
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+ warnings.simplefilter('ignore')
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+ if importlib.util.find_spec('pip._vendor') is None:
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+ return False # pragma: no cover
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+
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+ return True
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@functools.cached_property
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def _has_virtualenv(self) -> bool:
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